ACFM (Alternating Current Field Measurement)
The ACFM technique was originally developed to replace the use of magnetic
particle inspection in the detection of surface breaking fatigue cracks
located in offshore structures. ACFM is an electromagnetic technique subject
to magnetic principals and is typically applied to ferromagnetic materials.
ACFM techniques can be applied to rough surfaces and surfaces with coating
of up to 0.25”. Applications:
Crack Detection & Sizing of surface breaking flaws in complex geometry’s
such as nozzles, ring-grooves, grindouts or radiuses. The crack length,
depth and profile can be easily displayed as a cross-sectional view (printout)
of the crack.
Hydrogen Induced Cracking (HIC) Detection & Sizing in lieu of WFMT
examinations can be performed without costly surface preparation such
as sand or water blasting. Additionally, shallow, superficial cracking
can be ignored, as the detection threshold for ACFM is ?1 mm or .039”.
-Elevated Temperature examinations are performed for thermal fatigue
cracking and other surface breaking flaws at temperatures of up to 900F.
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