It is an inspection method used to detect surface defects. Ferromagnetic can be applied to all parts. Not applicable to ferro-magnetic materials. If a magnetic flux is applied to the inspection surface, leakage flux occurs on the discontinuities on the surface. In the meantime, if ferromagnetic powders are sprinkled on the inspection surface; As these dusts are attracted by stray fluxes and collect on the discontinuities, it is possible to detect the errors.

If there is paint blasting on the inspection surface, they directly affect the inspection result depending on the thickness. Very high magnetizing currents are required for large parts. As a result of the inspection, final cleaning is required for magnetization removal.