MT/MPI
Magnetic Particle Testing
This method is used to detect surface and near-surface discontinuities in ferromagnetic materials.
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What is MT/MPI?
Magnetic Particle Inspection (MPI) or Magnetic Testing (MT) is an NDT method for checking the surface integrity of ferromagnetic materials. The material is magnetized using a handheld yoke or a horizontal MPI bench setup.
Defects in the surface and shallow subsurface cause magnetic field fluxes to "leak". When a liquid containing tiny magnetic particles is applied, these particles accumulate around those discontinuities making them visible to the naked eye.
If necessary a white contrast agent is applied to the material before testing. For high sensitivity, a fluorescent liquid and blacklight can be used. This requires a dark testing environment.
Advantages
- Rapid inspection of large surfaces
- Relatively low equipment cost
- Detection of surface and near-surface defects
- Immediate interpretation of indications
- Can be used in workshop and on site
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