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There are many testing methods for ndt wire rope tester, including ultrasonic testing, ray testing, acoustic emission testing, eddy current testing, electromagnetic testing, mechanical testing, acoustic testing, current testing, optical testing, vibration testing, etc. Until recent years, electromagnetic testing is the main method in the testing of ndt wire rope tester, and the other non-destructive testing technology is still limited to the laboratory research stage.

In view of LF type defect of local damage, magnetic flux leakage detection principle is adopted, that is, the defect of wire rope is detected by leakage magnetic field at the broken wire of wire rope.

In view of LMA type defect of metal cross-section area loss, the main magnetic detection method is adopted, that is, the change of metal cross-section area of wire rope is detected by measuring the magnetic flux passing through the inside of wire rope.

According to the different working principle of electromagnetic detection method, its magnetization can be divided into AC magnetization, DC magnetization and permanent magnetization. Because of its small size, light weight, convenient use and low detection cost, especially the development and application of new permanent magnet materials in recent years, the advantages of permanent magnet magnetization detection device are more obvious, so a large number of permanent magnet magnetization methods are used in electromagnetic detection method.

The commonly used sensor types are Hall element sensor and induction coil. In practical use, the output signal of Hall sensor is not affected by the moving speed of sensor, and the volume of Hall element is small, which has great advantages in measuring small gap space magnetic field. Therefore, the ndt wire rope tester has been widely used.

If you want to buy ndt device and do eddy current testing,welcome to call us,someone will answer the phone anytime.

Safety measures to be taken when handling the wire straightening and cutting machine

(1) When handling the wire straightening and cutting machine and installing the bearing frame, the center line of the bearing frame groove should be aligned with the guiding tube, and the center line of the straightening tube and the lower cutting hole.

(2) After installation, check the electrical system and other components for damage, whether the wire straightening cutting machine connection parts are firm and reliable, and whether each transmission part is flexible. After confirming that every part is normal, the test run can be performed. The bearing temperature should be checked during the test run to see if the workpiece such as the hammerhead, cutter and shear gear is in normal condition. Only after confirmed that there is no abnormal condition can the material be fed, the straightening test is run and the wire is cut off.

(3) Select the appropriate straightening block, the traction sheave groove, and the transmission speed according to the diameter of the reinforcing bar required to be straightened. And the diameter of the straightening block should be 2mm~5mm larger than the diameter of the reinforcing bar, and the width of the traction sheave groove should be consistent with the diameter of the reinforcing bar required to be straightened.

(4) Care must be taken to adjust the straightening block. In the straightening tube, there are generally five straightening blocks. The first and fifth straightening blocks must be placed on the centerline, and the middle three can be off centerline. First, shift the steel bar by an offset of about 3 mm. If the reinforcing bar still has a slow bend after the straightening test is run, the offset can be gradually increased until it is straightened.

(5) A steel pipe with a length of about 1 m should be installed at the front of the guide cylinder. The reinforcing bars to be straightened should pass through the steel pipe first, then penetrate into the guiding cylinder and the straightening cylinder to prevent the end of each reinforcing bar from popping out and causing hurt to people when the straightening is nearly completed.

• Before the straightening block is fixed well and the protective cover is on well, the reinforcing bar shall not be inserted to prevent the straightening block from flying out to injure people after the machine is turned on.

TJK is a leading manufacturer for Reinforcement Steel Processing Machines: Sitrrup bending, Cut & Bend, Mesh Welding, Cage Welding, Lattice Girder and Tunnel Lining, Tunnel segment machines etc.

Introduction to the Application of Wire Drawing Machine

Wire drawing machine is also known as wire drawing bench, which is used a wide range of mechanical equipment in industrial applications.

Wire drawing machine system is a very high demand for speed control equipment, the control system can provide very accurate, smooth linear velocity. While gold wire drawing machine has higher request than ordinary wire drawing machine. The whole system is complex, it needs more demanding coordination between the motor.

The system uses 4 sets of servo motor control and has the real time data exchange between each servo, Kinco’s communication ability can completely satisfy the various data real-time interaction between the shaft.

System needs more quick data between the interaction of the motor shaft, in order to ensure the wire line can be calculated in accordance with the requirements of the algorithms track wire in place side by side, and also make full use of the function of internal firmware kinco servo, through the calculation of drive themselves, to drive motor wire, omitted the traditional drawing machine control system is calculated by the controller position of silk and then transmitted to the drive caused by time delay, affirmed the wire delay minimization.

Each Component Function of Wire Drawing Machine

Screw: screw extruder is one of the most important components, is directly related to squeeze molding machine and the application scope of productivity. PP screw generally divided into three sections, delivery period, the material cannot but to pre heat in plasticizing, its main function is the transmission. Followed by compression section, the screw groove by gradually decreases, and the temperature to achieve the plasticizing degree, in order to complete the plasticization. Final is the material plasticizing metering section, in addition, the material keeps plasticizing temperature, conveying material and with a certain amount, in order to supply the nose, also cannot under plasticizing temperature.

Screw tubes: the main implementation with the screw, realize the plastic softening, plasticizing to get sufficient heat and plastic into a principle.

Die-head: The role of die-head rotation movement of the plastic melt into a parallel straight line, and give necessary to plastic molding pressure, plastic plasticizing compaction in the barrel, the filter in a passage through the membrane into the head, neck through the diaphragm to shape.

TJK is the largest manufacturer in reinforcing steel and wire processing machinery in China.

The computer controlled seven axis synchronous full automatic 2D sheet metal bending machine can convert the product immediately under the same line diameter and its own program; without the need of the special mold, it greatly reduces the time and cost of the newly developed product; the stereoscopic molding can produce a three-dimensional shape line molding product; with an auxiliary lifting platform, it can further guarantee the production. The stability and consistency of the product; the cutting knife can move down to allow more space for product molding.

Computer  wire molding machine, instead of traditional manual mold production line molding products, the machine has stable molding, rapid production, simple debugging, everyone can operate. Full automatic production and so on. It is widely used in automobile parts, supermarket shelves, kitchen utensils, iron wire crafts, and other industries.

Automatic 2D Wire Bending Machine Works

1, the equipment selected sub-drive control high-precision servo motor wire, mechanical transmission selection of precision gear connection, always keep the same line feed accuracy and wire feed speed;

2, shear cylinder hydraulic station equipped with a forced air-cooled radiator, double the extension of the hydraulic system components life;

3, the control system using PLC and text display connection, both convenient operation, but also to ensure the stability of the control system, and the design of the production of preset function control machine running.

Automatic  2D CNC Wire Bending Machine Structure Principle

1, by the precision servo motor drive wheel rotation, with PLC and text display instead of stepper motor controller, according to the need to arbitrarily modify the servo motor slow down the curve and the maximum speed of the servo motor to put an end to the impact of mechanical transmission, absolute To ensure that the actual transmission line length and the theoretical calculation of the length of the same;

2, in the design budget, the length of each MM has been divided into 10 pulses, to further ensure the length of the precision settings;

3, adjustable hydraulic cylinder cut, you can ensure the integrity of the circle incision, cutting time and retraction time can be directly modified in the text display;

4, the design of manual slow feeding, slow return function, easy to operate, reduce material loss.

CNC-480 2D Wire Bending Machine

2D Wire Bending Machine Technical Parameters:

Features of Sheet Metal Press Brake / Bending Machine

CNC Hydraulic Press Brake: Machine's CNC system is optional according to client requirement about an axis for press brake's working and Product accuracy.

2D  wire bending machine: CNC 2D wire bending machine is to produce kinds of wire forms expertly with high precision and fast speed. Adopts Japanese brand servo motor and screen display with the controller.

Roof tile Roll forming machine: It is widely used in industrial buildings, such as factory buildings, warehouses and so on. The high accurate machine series adapted with Plc control.

• rollers plate bending machine: It is controlled by PLC, and the positioning of the rolls is digital readout. The upper roller is in the shape of a drum, accompany of the support rolls of two lower rollers for up and down adjustment, it can get the high precision for deviation from straightness of the finished products. And we provide 3d wire bending machine for sale,please contact us.

With the deepening of isolation research and the development of isolation technology, nonlinear isolators suitable for various occasions have emerged. Laminated springs for the automotive industry are widely used in China. The principle is to use the dry friction between the steel plates to reduce the vibration and impact caused by the unevenness of the road. There are metal conical coil springs for the civil industry, as well as air springs.

During the entire deformation process of the wire rope shock mounts, sliding friction will occur between each wire rope, which consumes a large amount of energy and has a high equivalent damping ratio. Moreover, the wire rope anti vibration mounts exhibit nonlinear softening characteristics in a large deformation range, the stiffness decreases as the deformation increases, and the vibration isolation rate increases. Therefore, the good broadband isolation performance of the wire rope isolator for vibration damping is especially suitable for the application of vibration and shock environment isolation.

The wire rope shock mounts have only been developed in the last 30 years. Compared with the above-mentioned isolators, it has four distinct advantages:
①Nonlinear soft characteristics;
②Multi-directional isolation, high damping ratio;
③Corrosion, high and low temperature resistance;
④Compact structure and light weight.

At present, the common wire rope anti vibration mounts have several types of spiral, arch and ring. But in either case, they are made of stainless steel wire rope wound or bent. Their common advantage is the three-way protection of the equipment, reliable operation in high temperature and harsh environments, wide load range, unlimited storage period and service life. In terms of impact resistance, it can achieve maximum impact attenuation in a minimum space, and its vertical allowable deformation can reach 40~60% of the height of the vibration isolator. In foreign countries, they are used in the transportation of some equipment to replace the impact-resistant packaging of raw plastics and rubber. Rocket and missile transport vehicles also use it. In terms of ships, it passed the tests of light impact machines, heavy impact machines and floating impact platforms to meet the requirements of MIL-S-901 and MIL-STD-167. The wire rope isolator has excellent durability and fatigue. A vibration isolator with a diameter of 2.4 mm has been tested for up to 150 hours and seven million tests at 13 Hz and ±1.5 mm amplitude. The result is safe and sound.

For a 1.5mm wire rope isolators damping with a 1.5mm diameter, a sweep vibration test up to 10KHZ was performed, and the vibration isolation effect was 95%. This proves that the wire rope isolator for vibration damping can isolate small amplitude and structural noise. Wire rope anti vibration mounts are widely used in vibration and shock isolation of instruments, instruments, control boxes, etc., and some of the original rubber vibration isolators have been replaced by wire rope shock mounts.

Hoan is one of the leading wire rope isolator manufacturers in China, Welcome for enquiry.

Donghong Craft, as a professional metal crafts manufacturer, is able to make the custom military buttons for coats based on designs provided. We have been supplying garment accessories for military uniforms and general garments for more than 35 years.

Specifications of clothing buttons:

Material : Zinc Alloy, Bronze, Brass, Iron, Aluminum, Pewter, Copper,etc.

Process : Die stamped, Die Cast

Logo: Embossed & Debossed

Size: 24 Ling/ 26 Ling/ 28 Ling/ 30 Ling/ 32 Ling/ 36 Ling/ 40 Ling

Plating : Shiny, Antique, Satin, Gold, Silver, Copper, Nickle, Chrome,etc.

Holes: No Holes, Two Holes, Three Holes, Four Holes

Welcome to contact us for quotation custom military uniform buttons!

BEST Grounding Module

Performance and characteristics of BEST grounding module:

The low-resistance grounding module is a non-metallic material-based grounding body composed of non-metallic minerals with good conductivity and chemical stability, metal ground rods, electrolytes and humectants.

Ground Module performance and characteristics

1. The contact resistance is greatly reduced.

The main material of the grounding module is similar to the physical structure of the soil, and can be integrated with the soil, so that the effective contact area between the grounding body and the soil is increased by many times compared with that between the traditional metal grounding body and soil, which has increased the flow area of the grounding body itself and greatly reduced contact resistance of the grounding body to the soil.

2. The grounding resistance is stable

The grounding module has strong moisture absorption and moisturizing ability, ensuring that the grounding module can effectively play the conductive function. At the same time, the conductive characteristics of the grounding body are not affected by the weather changes such as dry humidity, high and low humidity. Therefore, it can provide a stable low grounding resistance.

3. Reduce ground potential counterattack

The non-metallic material in the grounding module forms a low-resistance region with a gentle change between the metal and the soil with a large difference in electrical resistivity. When encountering a large current surge, the potential gradient of the grounding body and the grounding wire can be lowered to lower the step voltage and the contact voltage so as to reduce the probability of counterattack of the ground potential.

4. Long service life

The main material of the grounding module is similar to the physical structure of the soil, and can be integrated with the soil, so that the effective contact area between the grounding body and the soil is increased by many times compared with that between the traditional metal grounding body and soil, which has increased the flow area of the grounding body itself and greatly reduced contact resistance of the grounding body to the soil.

5. Simple construction and installation

Compared with the traditional metal grounding device, the construction work is greatly reduced.

Ground module use range:

1. Working grounding, safe grounding and lightning protection for power plants, substations, switching stations, high-voltage transmission lines, electrified railways, telecommunications, mobile communication base stations, microwave relay stations, ground satellite receiving stations and radar stations;
2. Working grounding and protective grounding for valuable precision instruments, computer room equipment, postal and telecommunications program control equipment, radio and television equipment, and electronic medical equipment;
3. Lightning protection of various high-rise buildings, tall structures, scenic ancient buildings and tall memorial towers;
4. Lightning protection of oil pipelines, oil and gas tanks, and inflammable and explosive material warehouses.

Ground Module usage method:

1. The low-resistance grounding module can be vertically embedded or horizontally embedded, and the  embedded depth should not be less than 0.6 m, generally 0.8- 1.0 m.
2. When several modules are embedded in parallel, the module spacing should not be less than 4.0 meters. If the conditions are not allowed, it can be appropriately reduced. At the same time, the value of the module utilization coefficient should be reduced when the amount of module is calculated.
3. When the module pole cores are connected in parallel or connected to the ground wire, they must be welded, with the welding length no less than 100mm.
4. The welding slag should be removed at the weld, coated with anti-corrosive conductive paint or wrapped with HD-JZ high-efficiency swelling resistance-reducing agent.
5. During backfilling, it should be sprinkled with water in an appropriate amount, tamped in layers and watered again after backfilling. Meanwhile, the grounding resistance should be measured after the module is fully hygroscopically absorbed (72 hours).

Ground Module Specifications: 

Precautions；

1. The storage module should maintain a certain humidity to avoid high temperature, dryness and explosion;
2. External force should be avoided to damage modules during transportation and installation;
3. In cold areas, the module should be embedded below the frozen layer.

Usage calculation

According to the soil resistivity of the grounding network soil layer, the amount of HD-GO grounding module is calculated by the following formula; horizontal embedding, single module grounding resistance: total grounding resistance after parallel connection.

BEST grounding module

In the formula

ρ- soil resistivity (Ω.m)

a and b- length and width of the grounding module (m)

Rj- single module grounding resistance (Ω)

Rnj- total grounding resistance (Ω)

n- number of grounding modules

η- module adjustment factor, generally 0.6 -0.9

Ningbo Zhenhai Beisuda Petrochemical Equipment Co.,Ltd located in Ningbo, Zhejiang, it is a professional enterprice, who focus on R&D, production, sales of copper clad ground wire. We sincerely invite and welcome people from all around the world to invest and create more values together.

COPPER-CLAD STEEL GROUNDING CONDUCTORS

Copper-clad copperweld steel grounding material is a new material developed by Ningbo Zhenhai Beisuda Petrochemical Equipment Co.,Ltd. to replace pure copper. Copper-clad copperweld steel grounding conductors has the following advantages:

With high strength

With low price

High corrosion resistance

High electrical conductivity of copper

APPLICATIONS OF CCS GROUNDING GROUND CONDUCTORS

In recent years, the  copper clad steel ground rod has been widely applied to UHV lines, petrochemicals, nuclear power, high-speed rail, especially key projects. Copper-clad steel: A material in which the surface of a steel core is uniformly coated with copper, including copper-clad steel bars (for vertical grounding only), copper-clad steel flat steel, and copper-clad steel wire (including copper-clad steel round wire and copper-clad steel stranded wire).

Copper Clad Steel Grounding Conductor Advantage:

1. It has strong corrosion resistance and will not be disjointed, warped or cracked. The corrosion of the grounding body of the grounding grid is reduced, which improves the overall operational safety of the equipment.

2. Copper-clad steel grounding material - grounding conductor has thick copper layer, good electrical conductivity and stable electrical performance; copper-clad steel ground rod and copper-clad steel round copper layer can reach 0.5mm and above, and copper-clad steel strand conductivity can be 40. %the above.

3. The copper layer and the steel material reach the molecular type combination, and the ground rod will not break when it penetrates the soil;

4. The copper-coated steel round bar is used as the grounding material, which has high efficiency of reducing the resistance. For the design of the high-resistance section, the length of the grounding body is reduced by 1/3, so that the excavation amount of the earthwork is greatly reduced;

5. When copper-coated steel flat steel is used as a horizontal grounding body, the grounding material used is greatly reduced and the cost is saved because the material itself has a large contact area with the ground and a high electrical conductivity.

6. The design uses the exothermic welding process, which is very suitable for the needs of field construction, greatly improving the work efficiency and effectively shortening the construction period.

Ningbo Zhenhai Beisuda Petrochemical Equipment Co.,Ltd located in Ningbo, Zhejiang, it is a professional enterprice, who focus on R&D, production, sales of copper clad earth rod. We sincerely invite and welcome people

Exothermic Welding

Exothermic welding, also called hot melt welding, fire-clay welding, thermite welding and explosion welding, is a kind of exothermic welding products that utilizes the redox reaction between metals, the operation of which is simple, easy to learn, safe and efficient, and it has significant results in the production of high quality permanent welded joints between homogeneous metals and metals of different materials and is now well known to the public, becoming more popular in more and more architectural designs, and widely required to replace the connection method using conventional metal fixtures.

Exothermic welding requires high-quality graphite to form a cavity mold with a certain shape, such as line style (butt), T-joint (three-way), cross-type joint (four-way) and so on. The mold can be used multiple times, effectively saving costs.

Exothermic Welding Advantanges:

1. Good electrical conductivity: the current-carrying capacity of the welded joint surface is almost the same as that of the metal conductor, and the electrical conductivity is strong.

Experiments have shown that the the change rate of DC resistance before and after welding is close to zero, which is incomparable with any traditional connection mode.

2. Long and durable life: due to the high temperature fusion between the metal conductors during exothermic welding, an integrated permanent joint is formed, which is very strong and difficult to break and damage.
3. Strong corrosion resistance: the material of the welded point is mainly copper, and the corrosion resistance is almost the same as that of copper.
4. The operation is convenient and simple with no need for professionals but can be performed only after pepole are simply trained by professionals.
5. The requirement for operating environment is low, and no external power source or heat source is required for welding.

Operation flow of hot-melt welding

1. First, the mold and the welded conductor joint should be cleaned, and then the welded conductor should be fixed at the center of the mold cavity.
2. Close the mold and steadily place a metal protective gasket on the bottom of the mold furnace.
3. Pour in the exothermic welding flux, and evenly spread the starting powder on the surface of the flux and place it in an environmentally friendly starting powder.
4. Cover the mold, expose a part of the pyrophoric wrap at the mold opening, and then ignite the starting powder with an igniter.
5. After the hot-melt flux is ignited, a high temperature reaction occurs in the mold.
6. After the reaction is completed and cooled, the mold is opened and the welded conductor has been permanently connected.

Welding For Grounding Precautions Flammable and explosive articles shall not be placed within 2 meters of the site during construction operation. Unrelated personnel shall not stay and operators must wear heat insulation gloves and related protective equipment.

Ningbo Zhenhai Beisuda Petrochemical Equipment Co.,Ltd located in Ningbo, Zhejiang, it is a professional enterprice, who focus on R&D, production, sales of copper clad ground wire. We sincerely invite and welcome people from all around the world to invest and create more values together.

What is the copper-bonded copperweld steel ground rod?

Product Name: Copper coated copperweld steel ground rod

Production process: electroplating / continuous electroforming

Raw materials: Cold draw high quality mild steel

Product type: one pointed, one flat, two threads (requires with a striker, connector, drill)

Thread production process: mainly consists of two processes: turning before electroplating and rolling after electroplating

Tensile strength: 450-600MPA

Copper layer thickness: more than 0.254mm

Super copper thickness: 0.33-1mm

Why choose our Copper-bonded steel ground rod?

1. Factory history 30 years
2. Export history 10years
3. Quality control
4. Technical skill(copper thickness 0.5mm/0.8mm/1mm)
5. OEM service
6. Free sample

Copper-bonded copperweld steel ground rod advantags:

1. Higher tensile strength than pure copper ground rod, can be as high as 600MPA and above
2. Superior corrosion resistance: underground service life of up to 30-50 years
3. Compared with pure copper ground rod, it has excellent electrical conductivity of copper and saves cost.
4. Compared with traditional galvanized ground rods, the conductivity is higher and the corrosion resistance is stronger.
5. The connection to the grounding grid can be made by exothermic welding, integrated and molded, and the grounding resistance is small, making it a permanent maintenance-free grounding device.

Production reference standard: US UL467, national grid production enterprise standard QDW466-2010, etc.

Copper-bonded copperweld steel ground rod application range:

Lightning protection grounding projects in petrochemical plants, oil storage, power plants, substations, communication base stations, airports, network equipment rooms, etc.

Remarks: Copper-bonded copperweld steel copperweld ground rod steel material and copper plating thickness can be customized according to requirements, the company provides OEM service.

Copper bonded earth rod specification 
1. Copper layer 0.254mm

2. Copper layer 0.33-0.5mm

Remark: If you want to buy grounding rod,please contact us, we off OEM service. 

Ningbo Zhenhai Beisuda Petrochemical Equipment Co.,Ltd located in Ningbo, Zhejiang, it is a professional enterprice, who focus on R&D, production, sales of copper clad earth rod. We sincerely invite and welcome people from all around the world to invest and create more values together.

Chemical Ground Electrode System

Performance characteristics and working principle of Chemical Ground Electrode:

1. Chemical ground electrode
2. Existing soil
3. Special filler
4. Ions diffuse around
5. Expand the conductive range of the soil

Chemical ground rod (chemical grounding rod) is a new type of grounding system suitable for all kinds of places with high grounding requirements and difficult grounding engineering.

The chemial grounding electrode system consists of advanced alloy compounds, with a copper tube on the outside to ensure maximum conductivity and long service life. The filling material inside the conductor contains special ionic compounds, which can absorb moisture in the air adequately. Active ions can be effectively released into the soil through the deliquescence, and interact with the moisture in the soil and air to further promote the external slow release and drag reduction of conductors, and to maintain the long-term stability of the resistance value. Compounds in conductors are gradually combined in colloidal transparency over time.

By utilizing the conductivity of the colloidal compound, the entire system can be ion-exchanged for a long time, thus forming an ideal electrolytic ion grounding system. After the slow-release filler in the conductor is embedded, the grounding resistance will gradually decrease, reaching a stable value within six months to one year, and the embedded slow-release process can last for several years. The main connecting parts of the ion grounding electrode are hot-melt welded, which has overcome other connection methods and easy connection loosening.

The connecting wire is a copper clad steel copperweld stranded wire with a section of 95 mm2 and a length of 3 m and is crimped to the grounding terminal/copper lug to facilitate connection with the grounding grid.

Chemical Ground Electrode Specification and models

The grounding electrode of BEISUDA COMPANY electrolytic ion fully meets the requirements of grounding protection equipment such as UL, NEC, ANS, lEC, BC and other international standards.

Chemical Ground Electrode application range

Lightning protection and grounding works for petrochemicals, oil storage, power plants, substations, communication base stations, airports and network computer rooms, etc.

Ningbo Zhenhai Beisuda Petrochemical Equipment Co.,Ltd located in Ningbo, Zhejiang, it is a professional enterprice, who focus on R&D, production, sales of copper clad ground wire. We sincerely invite and welcome people from all around the world to invest and create more values together.

GSET-551 Steel Wire Eddy Current Flaw Detector Brief

Using the eddy current signal processing method and high-performance DSP algorithm, the NDT wire rope tester detection ability of micro-crack is as high as 0.05mm deep crack.

Using computer digital technology and "digital eddy current detection technology" to achieve high-speed data processing capabilities, detection speed can be reached to 1~500m/min.  Technology can effectively suppress all kinds of interference signals. It has waveform, amplitude, phase, X-axis and Y-axis signals.

The professional "digital filtering" is adopted to effectively suppress the interference signal in the field and ensure the accuracy and stability of the detection.

Features of GSET-551 Steel Wire Eddy Current Flaw Detector

1. LF testing sensitivity

The detector detects the minimum metal cross-sectional area change and the minimum length of the damage length corresponding to the local damage.

2.  LMA testing sensitivity

The detector detects the minimum metal cross-sectional area change and the damage length minimum size corresponding to the metal cross-sectional area loss.

3.  LMA repeatability error

The maximum value of the random error obtained by performing multiple consecutive measurements of the same metal cross-sectional area change in the same test sample under the same test environment and conditions within the instrument range.

4.  LMA linearity error

Within the range of the instrument, the metal cross-sectional area of the test sample is linearly proportional to the absolute value of the maximum deviation between the measured curve of the instrument and the calibration curve fitted by the measured value of the cross-sectional area of the metal.

5.  LMA error of indication

The value of the metal cross-sectional area loss measured by the instrument minus the actual value of the metal cross-sectional area loss within the instrument's range.

6.  LMA linearity error

In the range of the instrument range, under the condition of the length loss of the cross-sectional area of the metal, the cross-sectional area loss of the metal on the wire rope measured by the detector is matched with the value of the loss of the cross-sectional area of a group of wire ropes measured by the instrument. The absolute value of the maximum deviation between the calibration curves.

7. Testing distance resolution

The detector is capable of detecting the resolved minimum distance.

8. Dual function instrument

The detector can detect and display changes in metal cross-sectional area loss (LMA) on one channel, and detect and display local damage (LF) on the other channel. The detector recording device can be a computer, graphic recorder or other matches. device.

9. Single-function instrument

The detector cannot simultaneously detect and display metal cross-sectional area loss changes and local damage, and can only detect and display one of them. The detector recording signal device can be a computer, a graphic recorder or other matching devices.

10. Wire rope electromagnetic tester

The detector principle and composition meet the requirements of the GB/T 21837-2008 standard, and it has a detector for detecting distance display, data storage or recording function.

GSET-551 Steel Wire Eddy Current Flaw Detector performance

Nanjing BOKENA Automation System Co., Ltd., originated from the eddy current testing laboratory of the Nanjing University of Technology. It is one of the most professional ndt testing equipment suppliers in China. We sincerely invite and welcome people from all around the world to invest and create more values together.

0.8 Series  Copper Coated Stainless Steel Wire

Origin of new material development

0.8mm series copper-clad round wire is a new type of material developed by our Company to replace pure copper. Because it has the advantages of high strength, low price, high corrosion resistance and high conductivity of copper, and meanwhile its comprehensive performance is high and its cost is more economical than pure copper grounding device, it has been widely used in UHV lines, petrochemical industry, nuclear power and high-speed railway, especially in key projects in recent years.

Copper-clad steel:

The material in which the surface of a steel core is uniformly coated with copper includes copper-clad steel bars (for vertical grounding electrode only), copper-clad steel tape, and copper-clad steel wires (including round wires and stranded wires). According to the production process, it can be divided into continuous casting copper-clad steel and electroplating copper-clad steel.

Development of copper-clad steel grounding device

With the increasing voltage level of power lines and the increasing capacity of the system, higher requirements are put forward for the safety and reliability of grounding devices.

The traditional method in foreign countries is to use pure copper as the grounding material, but pure copper is expensive and it is a strategic resource, which is not suitable for being massively used as grounding devices in China. From 1910 to 1955, National Bureau of Standards (NBS) conducted corrosion resistance studies of grounding bodies. 36,500 samples collected at 128 test sites throughout the United States represented 333 metal materials consisting of iron, non-ferrous metals and protective coatings, respectively. The test results show that only steel bars and stainless steel bars with copper plating thickness over 0.5mm can be accepted.

In addition, continue the statistical data of 8 to 30 years and take the test results of 43 copper samples in different soils, 41 of which were calculated, to get the 0.17mm average pitting depth of 30 years. Therefore, some international standards have determined the thickness of copper coating of copper-clad steel material to be at least 0.25 mm. Considering the hard friction during construction, it is suggested that the thickness of copper coating be defined as 0.5-0.8 mm.

In China, copper clad(copperweld) steel materials are widely used in substation grounding grids in areas with high soil resistivity. Because of the characteristics of UHV project, such as high voltage level, large capacity and short power cut window period, combined with the corrosion intensity of groundwater in the area, copper-clad steel grounding devices have been applied in UHV lines and many UHV lines in China use copper-clad steel materials as grounding bodies.

Comparison between copper-clad steel grounding and traditional hot-dip galvanized steel grounding device

1. Corrosion rate comparision
   Annual corrosion rate of grounding materials in some place of Beijing and Tianjin

The test results show that galvanized steel has the most serious corrosion and its corrosion rate is more than 50 times higher than that of pure copper; the corrosion degree of stainless steel is much lower than that of pure copper and copper-clad steel, showing good corrosion resistance; as a copper-steel composite material, the self-corrosion potential of copper-clad steel in soil is basically the same as that of pure copper, and its corrosion rate is the same as that of pure copper; the corrosion rate of the electroplated copper-clad steel with thinner coating is higher than that of the continuous casting copper-clad steel with thicker coating.

2. Analysis and comparison of physical performance in short circuit

If the conductivity of copper were 100% and the conductivity of standard 1020 steel were only 10.8%, the conductivity of copper would be about 10 times that of steel. However, the conductivity of the 30% conductivity copper-clad round wire would be 30%, and the conductivity of the 40% conductivity copper-clad round wire would be 40%, which would be far better than the steel grounding body. Especially under skin effect, the conductivity of copper-plated strands at high frequencies would be much better than that of steel, that is, the conductivity of copper grounding body would be better than that of steel grounding body. The melting point of copper is 1083℃ and the maximum allowable temperature during short circuit is 450℃ ; the melting point of steel is 1510℃ and the maximum allowable temperature during short circuit is 400℃. Therefore, when the grounding body has the same cross section, the copper-clad steel grounding material has better thermal stability.

3. Economic comparison

According to Appendix D of Technical Conditions for Copper-clad Steel for Grounding in Electrical Engineering, the corrosion rates of copper clad steel in different soils are calculated according to the reference values in table. Corrosion rate of pure copper under different soil corrosion grades (mm/a)

The 0.8mm copper plating thickness is enough to meet the requirement of 60 years of service under the grade of III extremely strong corrosion.

The corrosion rate of galvanized steel is nearly 50 times that of copper-clad steel under the same soil conditions, and the grounding body should be overhauled after being used for 3-5 years.

The State Grid has accounted the UHV tower according to the drawings: after the investigation of the market price of material during the construction, the market price of the copper-clad-steel grounding body is calculated at RMB 20 /m, the market price of φ12 galvanized-steel round steel grounding body is calculated at RMB 6 /m and the grounding body laying is calculated according to the grounding construction drawing. During the 30-year whole life cycle, galvanized steel is overhauled every 5 years, of which the cost of material is RMB 20 /m for copper-clad steel and RMB 36/m for galvanized steel, that is, only material cost can be reduced by 80%. Galvanized steel can be overhauled and replaced six times. If the construction cost is RMB 70 /m3 for earthwork and stone works and each base tower is calculated by 23 m3 for excavation, RMB 9660 per base tower will be saved.

Copper-clad steel construction

The horizontal laying of the copper-clad steel grounding device is the same as that of the ordinary galvanized round steel, where only the connection method is changed to hot-melt welding, which has reduced the contact resistance between the joints and is more conducive to the release of lightning current.

Exothermic welding, also known as "aluminum heat welding", is a simple, high-efficiency, high-quality metal joining process that has been mass-produced and used in China in recent years. Exothermic welding uses chemical reaction heat of metal compounds as heat source and through superheated (reduced) molten metal or indirect heating, a certain shape and size of the melted joint is formed in the cavity of the special graphite mould, which meets the engineering requirements, and finally through cooling and condensation, the welding process is realized. At present, exothermic welding has generally replaced the mechanical connection between metals in the past.

Advantages of copper-clad steel

1.It has strong corrosion resistance and will not be disjointed, warped or cracked. The corrosion in the grounding body of the grounding grid is reduced, which has improved the overall operational safety of the equipment;

2. It has good electrical conductivity and stable electrical performance;
3. The copper layer and the steel bar achieve molecular bonding, and the grounding bar will not break down when it penetrates into the soil.
4. The copper-clad-steel grounding material used has high efficiency of reducing the resistance, and the length of the horizontal grounding body is reduced by 1/3 for the design of the high-resistance section, greatly reducing the excavation amount of the earthwork;
5. The design and use of exothermic welding technology is very suitable for the needs of field construction, greatly improving work efficiency and effectively shortening the construction period.

Performance parameters of copper-clad steel wire

Copper layer thickness:0.8mm; tensile strength: greater than 500MPa; copper-clad steel bent 180° without peeling off copper layer.

Specification of 0.8mm series copper-clad round steel: Soft copper-clad round bars are generally packaged in hanks or rolls, 100 meters per roll, easy to transport, suitable for laying of large grounding grids and horizontal grounding lines.

Usage:key projects, large grounding grids and horizontal grounding wires in industries with higher lightning protection requirements, etc.

Note:

1. If the thickness of copper layer is required to be 1 mm, please contact us directly.
2. We undertake custom-made zinc-clad steel ground rod and round steel.

Production method of copper clad steel technical field The invention specifically relates to a production method of copper clad steel.

Background technologycopper clad steel

The conductivity of existing copper clad steel products is not good, far inferior to that of pure copper products. The reason is that the overall product performance is insufficient when copper is coated on steel materials in the process.

Summary of the invention

In view of the above technical problems, the invention provides a production method of copper clad steel.

A copper clad steel production method comprises the following steps:

1. Surface treatment of steel wire;
2. Stripping and wire drawing of the treated steel wire;
3. Straightening and polishing the treated steel wire.
4. Heating the treated steel wire to 300-400 degrees.
5. Melting copper into water in high temperature furnace.
6. The steel wire in step D is coated with copper water in step E and then cold crystallized to form the product.

Preferably, the  copper plated steel wire  surface treatment in step A is a mechanical grinding treatment without water contamination.

The invention provides a production method of copper clad steel. The conductivity of the product obtained by the method is close to that of the pure copper product, the cost is greatly reduced, and the service life is prolonged.

Ningbo Zhenhai Beisuda Petrochemical Equipment Co.,Ltd located in Ningbo, Zhejiang, it is a professional enterprice, who focus on production and sales of copper clad earth rod. We welcome merchants from all over the world to cooperate with our factory for mutual benefit and win-win, and jointly create a better future.

SUZHOU SEAPEAK CO., LTD.. is one of the most professional steel wire reinforced pvc hose suppliers in China, and we focus on producing high quality wire reinforced tubing.

Steel Wire Reinforced PVC Pipe

Used for drawing and conveying water,oil and powder in factory and agriculture.

Suitable for high strength working environment like suction and discharge for sand.

Good adaptability to hard weather condition and minus pressure,small bending radius,anti-abrasion.

Passed the ROHS,PAHS test.

Anti-uv.

Anti Static PVC Steel Wire Reinforced Hose

Anti static PVC steel wire reinforced hose is made of hi-elasticity hi-strength zinc plated metal wire and high-quality PVC compound.

The hose is clear and transparent with good flexibility and small bending radius. The features of our PVC steel wire reinforced hose are high-negative pressure resistant, high corrosion resistant, non-toxic and long life. The hose with copper wire can avoid blockage of the internal flow because of the static electricity. Our PVC hose is wildly used in mine, chemical plant and etc.

Oil PVC Steel Wire Reinforced Hose

working temperature:-5°c~65°c

PVC steel wire reinforced hose is widely used for drawing and conveying water, oil and powder in the factories, agriculture ,engineering, foodstuffs and sanitation lines. Our hose is non-toxic, without odor and transparent and light, with small bending radius.It has good adaptability to hard weather conditions and minus pressure.

Ordinary PVC Steel Wire Reinforced Hose

Characteristics:
This hose,with steel wire screwing inlaid in the hose,is light,transparent,with small bending radius.
It has good adaptability to hard weather conditions and vacuum pressure.
With colorful symbol lines on the surface of the hose,it can be beautiful.

Application:
The hose is widely used for suction and discharge of water,oil and powder in the factories,agriculture,engineering,foodstuffs and sanitation lines,the hose used for foodstuffs is made of special material.It is non-toxic,light,without odor and transparent.
The hose can be used for conveying milk,beverage,distilled liquor,beer,jam and other foods.We can also insert the copper wire into hose.This hose can avoid the block of the flowing in the hose due to static,and protect users from getting electric shock or electric current impingement.
Temperature range: -10℃ to +70℃

Heat Resistant PVC Steel Wire Hose

High-Temperature resistant PVC steel wire hose is made of good zinc plated metal wire and qualified special PVC compound

It can be used under 100 ℃ condition, suitable for different high temperature environment. The PVC steel wire hose is widely used for suction and discharge of water,oil and powder in the factories, agriculture,engineering,foodstuffs and sanitation lines.

Food Class PVC Steel Wire Hose

Construction of food class PVC steel wire hose : 
Tube and cover are crystal clear PVC FDA grade. 
Reinforcement is electro-galvanized spring steel wire.
Temperature: -14℉(-26℃) to +140℉(+60℃)

Application: 
food and beverage dispensing, air,water,coolant, car wash,deionized water systems and other clear flow applications.

Features:
clear food grade PVC allows for visual flow inspection.
Spring steel wire prevents kinking and collapsing.
All sizes are full vacuum.

PVC Steel & Fiber Composite Hose

Use high-strength fibers and high-quality galvanized spring steel wire as reinforcement.

The pressure resistance was enhanced 2-4 times than the single spiral wire reinforced hose.
Inserted the copper wire into the hose can avoid blockage of the internal flow because of the static electricity.

Our company is one of the most professional industrial hose manufacturers in China. And we are devoted to produce high quality hose and fittings.

Copper clad ground wire is a new material developed by Ningbo Zhenhai Beisuda Petrochemical Equipment Co.,Ltd. to replace pure copper. Copper-clad copperweld steel copper clad rod has the following advantages:

With high strength

With low price

High corrosion resistance

High electrical conductivity of copper

APPLICATIONS OF CCS GROUNDING GROUND CONDUCTORS

In recent years, the copper coated grounding wire has been widely applied to UHV lines, petrochemicals, nuclear power, high-speed rail, especially key projects. Copper-clad steel: A material in which the surface of a steel core is uniformly coated with copper, including copper-clad steel bars (for vertical grounding only), copper-clad steel flat steel, and copper-clad steel wire (including copper-clad steel round wire and copper-clad steel stranded wire).

Origin of new material development

0.8mm series copper-clad round wire is a new type of material developed by our Company to replace pure copper. Because it has the advantages of high strength, low price, high corrosion resistance and high conductivity of copper, and meanwhile its comprehensive performance is high and its cost is more economical than pure copper grounding device, it has been widely used in UHV lines, petrochemical industry, nuclear power and high-speed railway, especially in key projects in recent years.

coated ground wire:

The material in which the surface of a steel core is uniformly coated with copper includes copper-clad steel bars (for vertical grounding electrode only), copper-clad steel tape, and copper-clad steel wires (including round wires and stranded wires). According to the production process, it can be divided into continuous casting copper-clad steel and electroplating copper-clad steel.

Development of copper clad steel grounding device

With the increasing voltage level of power lines and the increasing capacity of the system, higher requirements are put forward for the safety and reliability of grounding devices.

The traditional method in foreign countries is to use pure copper as the grounding material, but pure copper is expensive and it is a strategic resource, which is not suitable for being massively used as grounding devices in China. From 1910 to 1955, National Bureau of Standards (NBS) conducted corrosion resistance studies of grounding bodies. 36,500 samples collected at 128 test sites throughout the United States represented 333 metal materials consisting of iron, non-ferrous metals and protective coatings, respectively. The test results show that only steel bars and stainless steel bars with copper plating thickness over 0.5mm can be accepted.

In addition, continue the statistical data of 8 to 30 years and take the test results of 43 copper samples in different soils, 41 of which were calculated, to get the 0.17mm average pitting depth of 30 years. Therefore, some international standards have determined the thickness of copper coating of copper-clad steel material to be at least 0.25 mm. Considering the hard friction during construction, it is suggested that the thickness of copper coating be defined as 0.5-0.8 mm.

In China, copper clad(copperweld) steel materials are widely used in substation grounding grids in areas with high soil resistivity. Because of the characteristics of UHV project, such as high voltage level, large capacity and short power cut window period, combined with the corrosion intensity of groundwater in the area, copper-clad steel grounding devices have been applied in UHV lines and many UHV lines in China use copper-clad steel materials as grounding bodies.

Comparison between copper-clad steel grounding and traditional hot-dip galvanized steel grounding device

1. Corrosion rate comparision

Annual corrosion rate of grounding materials in some place of Beijing and Tianjin

The test results show that galvanized steel has the most serious corrosion and its corrosion rate is more than 50 times higher than that of pure copper; the corrosion degree of stainless steel is much lower than that of pure copper and copper-clad steel, showing good corrosion resistance; as a copper-steel composite material, the self-corrosion potential of copper-clad steel in soil is basically the same as that of pure copper, and its corrosion rate is the same as that of pure copper; the corrosion rate of the electroplated copper-clad steel with thinner coating is higher than that of the continuous casting copper-clad steel with thicker coating.

2. Analysis and comparison of physical performance in short circuit

If the conductivity of copper were 100% and the conductivity of standard 1020 steel were only 10.8%, the conductivity of copper would be about 10 times that of steel. However, the conductivity of the 30% conductivity copper-clad round wire would be 30%, and the conductivity of the 40% conductivity copper-clad round wire would be 40%, which would be far better than the steel grounding body. Especially under skin effect, the conductivity of copper-plated strands at high frequencies would be much better than that of steel, that is, the conductivity of copper grounding body would be better than that of steel grounding body. The melting point of copper is 1083℃ and the maximum allowable temperature during short circuit is 450℃ ; the melting point of steel is 1510℃ and the maximum allowable temperature during short circuit is 400℃. Therefore, when the grounding body has the same cross section, the copper-clad steel grounding material has better thermal stability.

3. Economic comparison

According to Appendix D of Technical Conditions for Copper-clad Steel for Grounding in Electrical Engineering, the corrosion rates of copper clad steel in different soils are calculated according to the reference values in table. Corrosion rate of pure copper under different soil corrosion grades (mm/a)

The 0.8mm copper plating thickness is enough to meet the requirement of 60 years of service under the grade of III extremely strong corrosion.

The corrosion rate of galvanized steel is nearly 50 times that of copper-clad steel under the same soil conditions, and the grounding body should be overhauled after being used for 3-5 years.

The State Grid has accounted the UHV tower according to the drawings: after the investigation of the market price of material during the construction, the market price of the copper-clad-steel grounding body is calculated at RMB 20 /m, the market price of φ12 galvanized-steel round steel grounding body is calculated at RMB 6 /m and the grounding body laying is calculated according to the grounding construction drawing. During the 30-year whole life cycle, galvanized steel is overhauled every 5 years, of which the cost of material is RMB 20 /m for copper-clad steel and RMB 36/m for galvanized steel, that is, only material cost can be reduced by 80%. Galvanized steel can be overhauled and replaced six times. If the construction cost is RMB 70 /m3 for earthwork and stone works and each base tower is calculated by 23 m3 for excavation, RMB 9660 per base tower will be saved.

Copper-clad steel construction

The horizontal laying of the copper-clad steel grounding device is the same as that of the ordinary galvanized round steel, where only the connection method is changed to hot-melt welding, which has reduced the contact resistance between the joints and is more conducive to the release of lightning current.

Exothermic welding, also known as "aluminum heat welding", is a simple, high-efficiency, high-quality metal joining process that has been mass-produced and used in China in recent years. Exothermic welding uses chemical reaction heat of metal compounds as heat source and through superheated (reduced) molten metal or indirect heating, a certain shape and size of the melted joint is formed in the cavity of the special graphite mould, which meets the engineering requirements, and finally through cooling and condensation, the welding process is realized. At present, exothermic welding has generally replaced the mechanical connection between metals in the past.

Advantages of copper-clad steel

1.It has strong corrosion resistance and will not be disjointed, warped or cracked. The corrosion in the grounding body of the grounding grid is reduced, which has improved the overall operational safety of the equipment;

2. It has good electrical conductivity and stable electrical performance;
3. The copper layer and the steel bar achieve molecular bonding, and the grounding bar will not break down when it penetrates into the soil.
4. The copper-clad-steel grounding material used has high efficiency of reducing the resistance, and the length of the horizontal grounding body is reduced by 1/3 for the design of the high-resistance section, greatly reducing the excavation amount of the earthwork;
5. The design and use of exothermic welding technology is very suitable for the needs of field construction, greatly improving work efficiency and effectively shortening the construction period.

Performance parameters of copper-clad steel wire

Copper layer thickness:0.8mm; tensile strength: greater than 500MPa; copper-clad steel bent 180° without peeling off copper layer.

Specification of 0.8mm series copper-clad round steel: Soft copper-clad round bars are generally packaged in hanks or rolls, 100 meters per roll, easy to transport, suitable for laying of large grounding grids and horizontal grounding lines.

Usage:key projects, large grounding grids and horizontal grounding wires in industries with higher lightning protection requirements, etc.

Note:

1. If the thickness of copper layer is required to be 1 mm, please contact us directly.
2. We undertake custom-made zinc-clad steel ground rod and round steel.

Production method of copper clad steel technical field The invention specifically relates to a production method of copper clad steel.

Background technologycopper clad steel

The conductivity of existing copper clad steel products is not good, far inferior to that of pure copper products. The reason is that the overall product performance is insufficient when copper is coated on steel materials in the process.

Summary of the invention

In view of the above technical problems, the invention provides a production method of copper clad steel.

A copper clad steel production method comprises the following steps:

1. Surface treatment of steel wire;
2. Stripping and wire drawing of the treated steel wire;
3. Straightening and polishing the treated steel wire.
4. Heating the treated steel wire to 300-400 degrees.
5. Melting copper into water in high temperature furnace.
6. The steel wire in step D is coated with copper water in step E and then cold crystallized to form the product.

Preferably, the steel wire surface treatment in step A is a mechanical grinding treatment without water contamination.

The invention provides a production method of copper clad steel. The conductivity of the product obtained by the method is close to that of the pure copper product, the cost is greatly reduced, and the service life is prolonged.

We are one of the leading copperweld copper clad steel wire suppliers, RFQ today!