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Magnetic Particle Inspection

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Magnetic Particle Testing

Magnetic Particle Inspection (MPI) is a nondestructive testing (NDT) process for detecting surface and shallow subsurface discontinuities in ferromagnetic materials such as ironnickelcobalt, and some of their alloys.

The process puts a magnetic field into the part.

The piece can be magnetized by direct or indirect magnetization.

Direct / In-Direct Magnetization

Direct magnetization, occurs when the electric current is passed through the test object and a magnetic field is formed in the material.

Indirect magnetization, occurs when no electric current is passed through the test object, but a magnetic field is applied from an outside source.

HITS provides the following services with these technique:

Magnetic Particle Inspection is used to locate surface and slight subsurface discontinuities or defects in ferromagnetic materials.

Such flaws present in a magnetized part will cause a magnetic field (i.e. flux) to leave the part.

If MPI is applied to this surface, it will be held in place by the flux-leakage to give a visual indication.

The material allows the magnetic flux to leak since air cannot support as much magnetic field per unit volume as metals.

Magnetic Particles

  • Dry Powder
  • Wet System Particles (Fluorescent, Color Contrast)