What is ACFM inspection?

ACFM (Alternating Current Field Measurement) inspection is a non-destructive testing (NDT) technique used to detect and size surface-breaking cracks in metals. It works by inducing an alternating current into the surface of a component and then measuring the resulting electromagnetic fields to identify any disruptions caused by defects. ACFM is commonly used in industries such as oil and gas, marine, and structural engineering because it can be performed through coatings and requires minimal surface preparation. The technique provides accurate information about the length and depth of surface cracks, making it valuable for maintaining structural integrity and safety.