Electromagnetic Eddy Current Inspection for Coated Welded Lines

16MnR steel welded lines are tested with electromagnetic eddy current. The relation of the ability of crack testing and the coat thickness in an exteriorly clean weld was deduced. By the comparison with the penetrante test result, it shows that this measure can test diversified exterior flaws, such as cracks, pore and gnawing and so on, when the cote thickness is less than 500 μm.