Why Your MPI Inspections Might Be Missing Fine Discontinuities?
Magnetic Particle Inspection (MPI) is a go-to method for detecting surface and slightly subsurface discontinuities in ferromagnetic materials. But let’s be real—just because you’re using MPI doesn’t mean you’re catching everything. In fact, some fine discontinuities might be slipping right under your radar. So, what gives? Why are some flaws being missed even with regular inspections? Let’s dig into the details and uncover what could be going wrong—and how you can fine-tune your inspections for better accuracy. 1. The Limits of Magnetic Particle Inspection MPI is reliable, but it’s not perfect. It works best when flaws are perpendicular to the magnetic field. But what if a discontinuity runs parallel to the field lines? It might not disturb the field enough to produce a visible indication. Even worse, very fine discontinuities might not produce enough leakage field to attract the magnetic particles in the first place. What you can do: ● ...