Magnetic particle inspection

Magnetic Particle Inspection (MPI) is a nondestructive testing method used to detect surface and near-surface flaws in ferromagnetic materials like steel. The process involves magnetizing the material so that magnetic flux lines travel through it. Fine magnetic particles, often coated with a fluorescent or black dye, are then applied to the surface. If there are cracks or defects, they disrupt the magnetic field, causing the particles to gather and form visible indications at these defect sites. MPI is quick, effective, and helps ensure the safety and integrity of critical components without damaging the material.