What is Magnetic Particle Testing (MT)?

Magnetic Particle Testing (MT) is a non-destructive testing (NDT) method used to detect surface and near-surface discontinuities in ferromagnetic materials such as iron, nickel, cobalt, and some of their alloys. It involves inducing a magnetic field in the part and then applying magnetic particles to the surface. Discontinuities in the material create magnetic flux leakage fields that attract the magnetic particles, forming a visible indication of the flaw. MT is commonly used to inspect welds, castings, forgings, and machined parts in various industries, including aerospace, automotive, and manufacturing, to detect cracks, seams, inclusions, and other defects.