ACFM is an electromagnetic testing used for detecting and sizing surface – breaking cracks in metals. The basis of the technique is that an alternating locally uniform current is induced to flow in the component being tested. The current is undisturbed if the area is free of surface breaking cracks. A surface breaking crack will redirect the current around the ends and faces of the crack.
- Length & depth of the defect can be measured accurately.
- No surface preparation is needed for a test.
- All data can be stored.