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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 inspectionI 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

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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