Magnetic Particle Testing (MT)

Magnetic Particle Inspection (MPI)

Magnetic Particle Inspection (MPI) is NDT method that can uses magnetism to detect surface and subsurface discontinuities in ferromagnetic materials.

MPI is generally used to determine parts fitness for use. It is relatively easy and quick method which is widely used in various sectors such as automotive, oil and gas, aerospace, petroleum power generation etc.

This method detects surface or sub surface discontinuities such as cracks, porosity, laps, seams, inclusions in ferromagnetic materials. One of the major advantages of this method is, it is relatively fast method and gives an immediate indication on the surface.

This method works by inducing the magnetic flux in the part to be tested. If any discontinuities or detect is present on the surface or near the surface the magnetic field distorts and leaks around the defect. By application of magnetic medium on the surface, the particles attract to the area where flux leakage has occurred producing a visible indication of the defect. This indication can be evaluated by the operator any the necessary measures are taken, if any.

Our techniques for magnetic particle inspection include:

  • Yoke
  • Bench (for headshot direct induction)
  • Coil shot
  • Prods
  • Central conductor


ANDT has skilled NDT personnel that have gained years of experience in performing MPI and are Level 2 and 3 qualified with ASNT. We provide the testing both on-site at our customers’ premises.

When selecting ANDT for your magnetic particle inspection (MPI) needs, you have an assurance that your maintenance schedules will be met and you will benefit from expertise that our inspectors provide. Our reports will provide you with necessary data to take preventive measures and will help in management of assets.


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