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Which of the following methods is best for detecting interior flaws in the castings?(a) Liquid penetrant test(b) Visual inspection(c) Magnetic particle inspection(d) Ultrasonic inspectionThis question was addressed to me in an online interview.The above asked question is from Inspection Procedures in section Inspection Testing in Foundries of Casting-Forming-Welding I

Answer»

Right choice is (d) ULTRASONIC inspection

Easiest EXPLANATION: In the ultrasonic inspection, a beam of high frequency sound waves is introduced into material for the detection of interior flaws in the material. Then the sound wave travels through the material with some loss of energy and are REFLECTED at INTERFACES, which are further ANALYZED to define the presence and location of flaws in the casting.



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