Magnetic particle testing is an NDT method used to detect surface and near-surface discontinuities in ferromagnetic materials. MT involves magnetizing a ferromagnetic material and then applying fine ferromagnetic particles to the surface. Discontinuities in the material, such as cracks or voids, disrupt the magnetic field, creating a leakage field. The ferromagnetic particles are attracted to these leakage fields, forming visible indications of the discontinuities.
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