Frazer Nash NDT Ltd can supply Magnetic Particle Inspections (MPI) both in our lab and on site as required. MPI can only be applied to ferromagnetic materials such as steel and iron (excluding stainless steel). It is a reliable method of detecting near surface or surface flaws through principles of magnetic fields that are applied in several ways (most commonly yokes coils etc). Iron particles are applied to the test areas which are then attracted to areas of “flux leakage” caused by relevant flaws.
Fluorescent MPI can also be applied in conditions similar to that mentioned in Penetrant Testing, and is a widely used method for complex castings, machined parts or aerospace components where cleaning implications found in (PT) make Fluorescent MPI a more practical solution.