ACFM® (Alternating Current Field Measurement) is one of the non-destructive electromagnetic methods. It’s main purpose is to detect and size (length and depth) surface breaking cracks in magnetic and non-magnetic metals.
The ACFM technique introduces an alternating current into the surface of the component to detect defects. The presence of a crack disturbs the electromagnetic field and the return signal is converted to data, in real time, so that the operator is alerted to the presence of a defect. This results in cost and time saving benefits, which gives ACFM users and operators a great advantage over the popular MPI method.
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