Magnetic particle testing is an inspection method that is utilized to detect both surface and very shallow subsurface defects. This method of inspection is the fastest to detect these types of flaws. By utilizing a magnetic field and small magnetic particles, indications are formed on the the surface directly over the defect locations. Since the magnetic field is required, all test materials must be ferromagnetic (easily magnetized). The shape and form of these ferromagnetic materials is not important and has no limitation to the inspections.
Two of the biggest advantages of magnetic particle testing are:
- the speed of which the inspections can be performed
- the low cost associated with the testing