Question

Eddy current testing does not work below what thickness of materials?

(a) 0.1 mm

(b) 0.2 mm

(c) 0.3 mm

(d) 0.4 mm

The question was asked during an interview.

This is a very interesting question from Eddy Current Test topic in portion Non Destructive Techniques of Casting-Forming-Welding II

Answer 1

The correct choice is (a) 0.1 mm

Best explanation: It is one of the limitations of eddy current that defects having a thickness larger than required cannot be detected using eddy current method. Conventionally eddy current method cannot detect surface defects below 0.1 mm.