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Which of the following inspections is used for detecting invisible surface defects in a nonmagnetic casting?

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in Casting-Forming-Welding I by (687k points)
Which of the following inspections is used for detecting invisible surface defects in a nonmagnetic casting?

(a) Visual inspection

(b) Dye penetrant inspection

(c) Radiographic examination

(d) Ultrasonic inspection

I got this question in unit test.

This key question is from Inspection and Testing topic in division Inspection Testing in Foundries of Casting-Forming-Welding I

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Best answer
Right option is (b) Dye penetrant inspection

The best explanation: Dye penetrant inspection method is mainly used to detect invisible surface defects in a nonmagnetic casting. The casting is cleaned by brushing, and then spraying or dipping of the casting is done into a dye containing a fluorescent material. Then for inspection, casting is dried and viewed in darkness that reveals the discontinuities in the surface.

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