Magnetic Particle Inspection (MPI)
The MPI testing is done by a means of using a magnetic field in order to detect surface or sub-surface defetcs within materials, in doing so a special and visible sourse of iron oxide is then sprayed onto the testing surface.
With the great force of this magnetic field on the material, the oxide is then attracted to any flaws or defetcs within the material being tested. This being a fast and
y used NDT method.