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Which of the following defects are not detected by magnetic particle inspection?(a) Surface cracks(b) Quenching cracks(c) Thermal cracks(d) Fatigue cracksThe question was posed to me in an online interview.My doubt stems from Magnaflux Test in division Non Destructive Techniques of Casting-Forming-Welding II

Answer» RIGHT option is (a) SURFACE cracks

The best explanation: Quenching cracks, THERMAL cracks, grinding cracks or fatigue cracks are a few types of DEFECTS which can be detected by magnetic PARTICLE test, whereas surface cracks are defects which can be detected by simple visual inspection.


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