Non-destructive testing by means of magnetic particles is a method for the localization of surface and sub-surface discontinuities in ferromagnetic materials.
The test is based on the fact that when the object to be tested is magnetized, discontinuities that are located in a direction generally transverse to the magnetic field result in a deviation of the flow lines of the magnetic field itself.
The most frequent industrial applications are:
In the controls carried out during the production process the purpose is to detect as soon as possible, in the processing chain, any imperfections (discontinuity) of the material. For example, the control is frequently applied to pieces exiting the heat treatment process
The test is applicable only to ferromagnetic steels.
UNI EN 1290:2003
Non-destructive examination of welds - Magnetoscopic examination of welds with magnetic particles
ASME V art.7 1995
Magnetic particle examination
Non destructive testing. Magnetoscopic examination with magnetic particles. Magnetization techniques, relative parameters and characterization of magnetoscopic equipment.
UNI EN 1291:2003
Non destructive testing of welds - Magnetoscopic testing of welds with magnetic particles - Acceptability levels.
Non-destructive testing. Classes of irradiation and evaluation of the global efficiency of black light luminaires. Direct method.