Used for finding surface I near surface defects in ferromagnetic material, Magnetic Particle testing (MT) is a versatile inspection method used for field and shop applications. Magnetic particle testing works by magnetizing a ferrimagnet ice specimen using a magnet or special magnetizing equipment. If the specimen has discontinuity, the magnetic field flowing through the specimens interrupted and leakage field occurs. Finely milled iron particles coated with a dye pigment are applied to the specimen. These are attracted to leakage fields and cluster to from an indication directly over the discontinuity.

Advantages

• Detects both surface and near subsurface/sub surface indications/defects.
• Irregular shaped components can be tested.
• Fast method of inspection and indications are visible directly on the specimen surface.
• Considered as low cost technique compared to many other NDT techniques.