The causes and influencing factors of magnetic flux leakage in magnetic particle flaw detectors are as follows:

1. Magnetic permeability of defects: The smaller the magnetic permeability of defects, the stronger the leakage magnetic flux.

2. Magnetic field strength (magnetization force): The larger the magnetization force, the stronger the leakage magnetic field. 3. Shape and size of the inspected workpiece, shape and size of defects, burial depth, etc.: When other conditions are the same, the leakage magnetic flux generated by pores buried at the same depth below the surface is smaller than that generated by transverse cracks.

The reasons for magnetic leakage are:

Due to the fact that the magnetic permeability of ferromagnetic materials is much higher than that of non ferromagnetic materials, B magnetic lines cannot be allowed to pass through the defect area per unit area. As a result, some magnetic lines are squeezed into the material below the defect, and other magnetic lines are forced to escape from the surface of the workpiece to form leakage magnetic flux. The magnetic powder will be attracted by the leakage magnetic flux caused by this. Why do certain parts need to be demagnetized? The residual magnetism of certain rotating components will attract iron filings and cause friction damage to the components during rotation, such as shaft bearings. The residual magnetism of certain components will cause abnormal readings on nearby instruments. Therefore, why do some parts need demagnetization treatment after magnetic particle inspection.

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