Magnetic Particle Inspection
Magnetic particle inspection is a sensitive method of locating surface and some sub-surface defects in Ferro-magnetic components. The basics processing parameters depend on relatively simple concepts. In essence, when a ferromagnetic component is magnetized, magnetic discontinuities that lie in a direction approximately perpendicular to the field direction will result in the formation of strong ‘leakage field’. This leakage field is present at and above the surface of the component, and its presence is visibly detected by the utilization of finely divided magnetic particles. The application of dry or wet particles in a liquid carrier, over the surface of the component, results in a collection of magnetic particle at a discontinuity.