Permanent soft and hard magnetic materials, also known as hard magnetic materials, are materials that still have magnetism after the magnetization field is removed. Soft magnetic materials have strong magnetic induction strength when the magnetization field exists, and lose magnetism when the magnetization field is removed. Hard and soft here do not mean hard and soft in mechanical properties, but in magnetic properties. Hard magnetism means that a magnetic material can retain its strong magnetism (magnetism for short) for a long time after being magnetized by an external magnetic field, and is characterized by strong coercivity. Coercivity is the magnetic field strength that makes magnetized materials undergo demagnetization and reduce the residual magnetism (residual magnetic flux density or residual magnetization) to zero.

At present, the application market of magnetic materials products in China is expanding rapidly.  Magnetic materials matching components are increasingly demanded in the domestic market.  In accordance with the requirements of environmental protection, oil-free automobiles and motorcycles are the direction of future development, which will bring a broad market to the development of rare earth permanent magnets. "Green Lighting Project" is also a major energy-saving  project in our country. The development of energy-saving lamps requires the use of a large number of high-end ferrite soft magnetic cores and anti-interference magnetic cores.

With the increasing number of car production and speakers used, the demand for ferrite permanent magnet materials is also increasing. The development of computers has driven the development of related supporting components. Magnetic disks, optical disk drives and printer drive heads are the largest "users" of NdFeB. Multimedia acoustics also demands permanent magnetic materials (hard magnetic materials) in a large amount.

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Magnetic flux leakage test refers to the formation of a leakage magnetic field on the surface of a test piece after it is magnetized due to defects on the surface or near-surface of the test piece. People can detect defects by detecting changes in the leakage magnetic field.

Briefly describe the magnetization of ferromagnetic components. In the magnetic non-destructive testing, magnetization is the first step to realize the detection, which determines whether the leakage magnetic field signal can be generated, and also affects the performance characteristics of the detection signal and the structural characteristics of the detection device.  Like magnetic particle inspection, magnetization is achieved by a magnetizer, including both a magnetic source and a magnetic circuit.  The magnetic source and the magnetic circuit change depending on the structure of the member to be tested.

What kind of magnetization can be divided into several categories? The magnetization methods can be generally divided into five categories, namely, alternating current magnetization mode, direct current magnetization mode, permanent magnet magnetization mode, composite magnetization mode, and integrated magnetization method.

What are the characteristics of magnetic flux leakage detection technology?

Because leakage magnetic field detection uses magnetic sensors to detect defects, compared with magnetic powder, penetration and other methods, the magnetic flux leakage equipment has the following advantages:

1. It is easy to realize automation. The computer judges the presence or absence of defects based on the detected signals.

2. The fundamentally high detection reliability can solve the influence of human factors in the magnetic powder and osmosis method, and has high detection reliability.  

3. can achieve preliminary quantification of defects.  In the range of wall thicknesses up to 30 mm, the inner and outer wall defects can be detected simultaneously.  In the detection of the pipeline, 5 high-efficiency, pollution-free automated inspection can achieve high detection efficiency.

BKN's portable magnetic flux leakage testing equipment are capable of detecting workpieces efficiently and accurately.

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.

Electromagnetic detection is a very important non-destructive testing method and is widely used. Magnetic flux leakage testing is a magnetic method of nondestructive testing that is used to detect corrosion and pitting in steel structures, most commonly pipelines and storage tanks. The basic magnetic flux leakage principle is used to magnetize the steel. When used in combination with other methods, it provides a quick and inexpensive assessment of the workpiece of ferromagnetic materials. With the advancement of technology, people are paying more and more attention to the automation of the inspection process. This not only reduces the labor intensity of the inspection work but also improves the reliability of the test results and reduces the influence of human factors. The MFI magnetic flux leakage inspection method is a highly automated magnetic detection technology. The principle is that after the ferromagnetic material is magnetized, the surface and near-surface defects form a leakage magnetic field on the surface of the material, and defects are detected by detecting the leakage magnetic field. In this sense, the magnetic particle detection technology commonly used in pressure vessel inspection. However, it is customary to use the method of measuring the leakage flux with a sensor as the magnetic flux leakage detection, and the magnetic flux to detect the leakage flux. The method is called magnetic particle detection and they are juxtaposed into two detection methods.

Magnetic flux leakage testing can only detect surface and near-surface crack defects, and it needs surface grinding when testing. It is only suitable for the detection of workpiece discontinuation. In addition to the surface and near-surface crack defects, the MFI magnetic flux leakage inspection can also find the corrosion inside the workpiece from the outside. Defects such as pits, and do not need to be polished on the surface of the workpiece, suitable for on-line inspection of workpieces. On-line inspection of workpieces is currently the most urgent method for users, which can reduce unnecessary parking and reduce inspection costs. In addition, the magnetic flux leakage detection can also quantify the depth and length of defects. Although the application of magnetic flux leakage detection technology is rarely used in workpiece inspection, it has the advantages that magnetic particle detection does not have, so its application prospect is very broad.

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.

Magnetic flux leakage test refers to the formation of a leakage magnetic field on the surface of a test piece after it is magnetized due to defects on the surface or near-surface of the test piece. People can detect defects by detecting changes in the leakage magnetic field.

Briefly describe the magnetization of ferromagnetic components. In the magnetic non-destructive testing, magnetization is the first step to realize the detection, which determines whether the leakage magnetic field signal can be generated, and also affects the performance characteristics of the detection signal and the structural characteristics of the ndt machine. Like magnetic particle inspection, magnetization is achieved by a magnetizer, including both a magnetic source and a magnetic circuit. The magnetic source and the magnetic circuit change depending on the structure of the member to be tested.

What kind of magnetization can be divided into several categories? The magnetization methods can be generally divided into five categories, namely, alternating current magnetization mode, direct current magnetization mode, permanent magnet magnetization mode, composite magnetization mode, and integrated magnetization method.

What are the characteristics of magnetic flux leakage detection technology?

Because leakage magnetic field detection uses magnetic sensors to detect defects, compared with magnetic powder, penetration and other methods, it has the following advantages:

1. It is easy to realize automation. The computer judges the presence or absence of defects based on the detected signals.
2. The fundamentally high detection reliability can solve the influence of human factors in the magnetic powder and osmosis method, and has high detection reliability.
3. can achieve preliminary quantification of defects.  In the range of wall thicknesses up to 30 mm, the inner and outer wall defects can be detected simultaneously.  In the detection of the pipeline, 5 high-efficiency, pollution-free automated inspection can achieve high detection efficiency.

BKN's portable magnetic flux leakage equipment are capable of detecting workpieces efficiently and accurately.

We are one of the professional ndt equipment manufacturers, why don’t RFQ today!

Strainers, dirt separators and backflow preventers are designed to prevent impurities from entering the specified pipe section. Comparing these three types of products, we can analyze from the following points: first, flow resistance. Many manufacturers tend to ignore this point and push the performance of the product to push the product's practicality. However, if the flow resistance fails to meet the requirements, and there will be impurities in the later stage, the flow resistance will be larger and larger, especially affecting the energy consumption, thus the gain is not worth the loss.

The flow resistance of ZhengFeng's products is tested by the third-party testing center in China to achieve the best product status and reduce the daily operating costs of customers; Second, the filter core material. If used in medium for a long time, the filter core material shall have a long life, which can prevent frequent replacement and the risk of secondary pollution caused by corrosion of the filter core being washed away; Third, filtering performance.

This is also a point that will be paid attention to. According to the customer's working conditions, ZhengFeng can customize a special filter to achieve the use effect; Fourth, discharge function. In the market, the function of sewage discharge is often neglected, and some manufacturers may only consider the part of filtration function while missing the part of timed emission. All sorts of surprises are hard to predict, apart from the human cost, if cleaning is required. Therefore, the filtering products of ZhengFeng have additional sewage discharge devices, such as y strainer with drain valve, magnetic y strainer, magnetic dirt separator, etc., to meet the requirement that customers can easily open the device outside the valve and clean the impurities inside the valve without removing the valve.