Magnetic Particle Inspection (MT or MPI) is an inspection method for locating surface or shallow sub-surface defects on ferromagnetic material.

Because of the variety of equipment and materials, there is essentially no limit to the size and shape of parts that can be inspected using MT. MT can be performed on castings, forgings, welds and machined parts, providing that they are of a material that can be strongly magnetized and the surface is sufficiently clean and accessible.

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