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Magnetic particle testing is using the interaction between the leakage field and the magnetic powder at the workpiece defect. It relies on surface and near surface defects of steel products (e.g. cracks, slag, hair lines, etc.) Magnetic permeability and steel permeability difference, after magnetization of these materials in the discontinuous magnetic field will be distorted, forming part of the magnetic flux leakage at the workpiece surface created a leakage magnetic field. Thus attracting the magnetic powder to form the magnetic powder accumulation at the defect - magnetic marks, as shown below; Then under the appropriate light conditions, the defect position and shape appear, the accumulation of these magnetic powder is observed and explained, the magnetic powder detecting. In industry, magnetic flaw detection can be used for final product inspection to ensure that the workpiece after various processing processes (such as welding, metal heat treatment, grinding), on the surface does not produce harmful defects.
Magnetic particle testing can also be used to detect semi-finished products and raw materials, such as bars, steel billets, forgings, castings, etc. to find the original surface defects. Magnetic particle testing is very effective for testing defects such as steel materials or workpiece surface cracks. The equipment and operation are simple; Fast inspection speed, easy to detect large equipment and workpieces in the field;
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