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MAGNETIC PARTICALS TESTING (MPT)
Magnetic Particle Testing (MPT) is also known as Magnetic Particle Inspection (MPI). MPT / MPI is based on the principle of magnetism. Defects are identified as magnetic flux leakage occurs when there is a discontinuity in magnetized ferromagnetic material and fine iron particles sprinkled over specimens create cluster formation.Magnetic Particle Testing is used to identify surface and subsurface defects. Defects in depth are inspected till 0.6-inch depth only (Under ideal condition).
To inspect surface defects we use AC current and for subsurface defects, we use DC current. Surface preparation is not as critical as in DPT and it is also known as the planer testing method.
Advantages of Magnetic Particle Testing
- Magnetic Particle Testing technique is a very fast method.
- MPI requires a normal level of skill as its process is not very complicated.
- The immediate result is observed in MPI as it is quick and fast.
- Surface and sub-surface defects can easily be identified using the MPT method.
- The cost of inspection using MPI is very low as compared to RT & UT.