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The Alternating Current Field Measurement technique is an electromagnetic technique capable of both detecting and sizing (length and depth) surface breaking cracks in metals. The alternating constant current in a tangential solenoid, remote from the test surface, induces electric currents in the sample surface which are uni-directional and of uniform strength over a localized area under the solenoid.

ACFM Advantages:

  • Reduced cleaning requirements with no need to clean to bare metal.
  • Detection and sizing of surface-breaking cracks in ferrite or austenitic steel or in transition welds between the two.
  • Rapid scanning using a hand-held probe.
  • Computerized Reporting and data collection for review
  • Inspection through 0.15” thick coating.