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In MPI method, the magnetic discontinuities lie in a direction parallel to the direction of the magnetic field.

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in Casting-Forming-Welding I by (687k points)
In MPI method, the magnetic discontinuities lie in a direction parallel to the direction of the magnetic field.

(a) True

(b) False

I have been asked this question in final exam.

My doubt stems from Inspection Procedures topic in section Inspection Testing in Foundries of Casting-Forming-Welding I

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Correct option is (b) False

The explanation: In MPI method, after the magnetization of the material or part which to be inspected, the magnetic discontinuities that lie in a direction generally transverse to the direction of the magnetic field. This causes a leakage field to form at and above the surface of the part, which indicates the presence of surface discontinuities.

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