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Magnetic Particle Testing MPI

Magnetic Particle Inspection

Magnetic Particle Inspection (MPI) is a non-destructive testing method used for examining ferrous metal’s surface and near surface defects. It makes use of an externally applied magnetic field or half wave DC (rectified AC) current through the material and the principle that the magnetic susceptibility of a defect is markedly poorer than that of the surrounding material. In a dark room using a black light, the defect will appear much brighter than the surrounding material and it is detected.

At AIRIS we have one Magna-flux machine capable of testing up to 15 fooMagnaflux Magnetic Particle Equipment Y-7 Yoket long samples. Our technicians are trained to perform wet magnetic particle inspection and have years of experience with this test method. We are accredited and follow the guidelines of ASTM E 1444.

WHEN TO USE MPI: MPI is typically utilized to inspect for surface flaws and cracks after heat treating, induction hardening, welding, straightening, or after the manufacturing process to assure the component has no surface issues.