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About: Alternating current field measurement     Goto   Sponge   NotDistinct   Permalink

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Alternating current field measurement (ACFM) is an electromagnetic technique for non-destructive testing detection and sizing of surface breaking discontinuities. It was derived from the methods used in eddy-current testing and works on all metals, ferrous or non-ferrous. Since it doesn't require direct electrical contact with the surface it can work through thin coatings such as paint. This practice is intended for use on welds in any metallic material.