Magnetic Particle testing (MPT) is a nondestructive method widely used in the field of materials technology. This method allows highlighting discontinuities or cracks open out or close to the surface. This technique works only on ferromagnetic material.

Magnetic particle inspection (magnetic examination) is used to make surface defects visible on magnetizable materials (iron, steel). In a new construction, the magnetic examination makes it possible to detect cracks, cracks, etc. during the various manufacturing phases, both in welding preparations and in welds. Magnetic examination can also be applied to detect fatigue cracks (as a result of metal fatigue) in installations in service