Magnetic particle inspection (MPI) is a nondestructive testing method used to test ferromagnetic components for surface and subsurface defects. The method, in use since the 1940’s is an efficient means of inspection. MPI as with all other inspection methods must be performed in accordance with specific steps to be effective. This paper provides an overview of the method and describes the test sequence to ensure proper inspection of components. The discussion will focus on inspection of freight car loose axles and wheel sets although the points brought forth apply to any part tested using MPI.

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