Magnetic particle inspection is a method of locating and defining discontinuities in magnetic materials. It is excellent for detecting surface & sub-surface defects in all magnetic materials and in welds, including discontinuities that are too small to be seen with the naked eye.
â€¢ Probes are placed on each side of the area to be inspected, and electric current is passed between them.
â€¢ A magnetic flux is produced at right angles to the flow of current.
â€¢ When a discontinuity such as a crack is detected, the magnetic flux leaks, creating points of attraction.
â€¢ A magnetic powder is then applied to the surface and clings to the leakage area more tenaciously than elsewhere, forming an indication of the discontinuity.