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Which of the following methods of inspection is mostly used for ferromagnetic materials?

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in Casting-Forming-Welding I by (687k points)
Which of the following methods of inspection is mostly used for ferromagnetic materials?

(a) Acoustic emission test

(b) Ultrasonic inspection

(c) Magnetic particle inspection

(d) Visual inspection

I had been asked this question in an international level competition.

My question is taken from Inspection Procedures topic in division Inspection Testing in Foundries of Casting-Forming-Welding I

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The correct choice is (c) Magnetic particle inspection

For explanation I would say: Magnetic particle inspection (MPI) is a method of locating surface and subsurface discontinuities in ferromagnetic materials. In this method, the material or part is magnetized and then the magnetic discontinuities occur which indicates the size, shape and extent of discontinuities.

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