Alternating Current Field Measurement (ACFM)

The ACFM technique is an electromagnetic non-contacting technique which has been developed to be able to detect and size surface breaking defects in a range of different materials and through coatings of varying thickness. The basis of the technique is that an alternating current flows in a thin skin near to the surface of any conductor. When a uniform current is introduced into the area under test if the area is defect free the current is undisturbed. If the area were to have a crack present then the current would flow around the ends and the faces of the crack. A magnetic field is present above the surface associated with this uniform current and this will be disturbed if a surface-breaking crack is present.

Alternating Current Field Measurement (ACFM) Inspection is a service provided by NDTrak, a Paragon Integrity Solutions company. ACFM can establish the length and depth of defects of longitudinal and transverse defects while inspecting ferrous and non-ferrous metals ranging in temperatures from 0 – 900 degrees without removing coatings. ACFM encoded data is recorded and provides an auditable permanent record. Please contact NDTrak for a technology demonstration at your location.

In addition to providing ACFM Inspection services, NDTrak can provide ACFM training under our ASNT corporate Level III. Please contact NDTrak for more information on ACFM training.

• Eliminates the need to remove the coating in order to inspect
• Allows 24/7 Inspection Activity
• No Interference to other Construction/Operation Activities
• Instant Test Results
• Portable
• Extremely Sensitive
• Requires access to one side only
• Provides Auditable, permanent record

AMIGO ACFM Test Unit

 

NDTrak ACFM Technicians are all ASNT Level II certified as a minimum, and ultilize state of the art ACFM test equipment from TSC Inspection Systems, as well as other state of the art NDT test equipment manufaturers

 

ACFM Probe