Magnetic particle testing (MT)

Magnetic particle testing is performed with a coloured fluid or fluorescent dye (under UV light), also at elevated temperatures. Magnetic particle testing is a method of surface and subsurface inspection (up to 2 mm of depth) used for ferromagnetic materials. It involves the introduction of a magnetic field into the object and observation of local dispersions of that field. Dispersions form directly above imperfections and are revealed with the use of fine particles applied to the surface of the inspected element during the application of the magnetic field.