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Any type of particles can be used for the detection of surface discontinuities of material in MPI method.

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in Casting-Forming-Welding I by (687k points)
Any type of particles can be used for the detection of surface discontinuities of material in MPI method.

(a) True

(b) False

This question was addressed to me in an interview for internship.

Asked question is from Inspection Procedures in chapter Inspection Testing in Foundries of Casting-Forming-Welding I

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The correct answer is (b) False

The best I can explain: In MPI method, the presence of discontinuities and the leakage field is mainly detected by the use of finely divided ferromagnetic particles applied over the surface, with some of the particles being gathered and held by the leakage field. This magnetically held collection of particles to form an outline of discontinuity, which defines the characteristics of the surface discontinuities.

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