Magnetic Particle Testing Method (2nd Edition) Questions And Answers


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Magnetic Particle Testing (MT) or Magnetic Particle Inspection (MPI), is used for the detection of surface and near-surface discontinuities in ferromagnetic materials such as iron, nickel, cobalt, and some of their alloys. Magnetic Particle Testing can be primarily used for crack detection. This method is applicable to all metals which can be strongly magnetised – ferritic steels and irons, but not generally austenitic steels.

MPI is when magnetic field is introduced into a specimen to be tested, then fine particles of ferromagnetic powder, or ferromagnetic particles, are applied to the area being tested. any discontinuity in the test area which cuts across the magnetic field creates a "leakage field". This has a north and south pole on either side of it and therefore attracts the particles in great numbers.

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