How Does Magnetism Work In Magnetic Particle Inspection?

Magnetic Particle Inspection (MPI) is a NDT process for detecting surface and shallow subsurface discontinuities in ferromagnetic materials such as iron, nickel, cobalt, and some of their alloys. The process puts a magnetic field into the part. But how does magnetism actually work? You’re probably familiar with the basics of magnets already: They have a north […]