Magnetic particle testing (abbreviated as MT)
Principle of magnetic particle testing: After ferromagnetic materials and workpieces are magnetized, due to the presence of discontinuities, local distortion of magnetic field lines on the surface and near the surface of the workpieces occurs, resulting in leakage magnetic fields. Magnetic particles applied to the surface of the workpieces are adsorbed, forming visible magnetic marks under appropriate lighting, thereby displaying the location, shape, and size of magnetic particle testing discontinuities.
Applicability and limitations of magnetic particle testing: a. Magnetic particle testing is suitable for detecting discontinuities on the surface and near surface of ferromagnetic materials that are very small in size, with extremely narrow gaps (such as cracks that are 0.1mm long and micrometer wide), and are difficult to detect visually. b. Magnetic particle testing can detect raw materials, semi-finished products, finished workpieces, and in-service components, as well as plates, profiles, pipes, bars, welded parts, cast steel parts, and forged steel parts. c. Defects such as cracks, inclusions, hairlines, white spots, folds, cold shuts, and looseness can be found. d. Magnetic particle testing cannot detect austenitic stainless steel materials and welds welded with austenitic stainless steel electrodes, nor can it detect non magnetic materials such as copper, aluminum, magnesium, titanium, etc. It is difficult to detect shallow scratches, deep buried holes, and delamination and folding with an angle less than 20 ° from the workpiece surface.
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