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ACFM
Introduction
Advantages
of ACFM
Why
Choose ACFM?
The main advantages of
ACFM are :
- The ability to detect defects through several millimetres of
coating. This means that paint or other protective coatings do
not have to be removed and then reapplied.
- Works equally well on plain material or welds, ferritic or non-ferritic
metals.
- Can be used on hot surfaces, underwater, or in irradiated environments.
- Provides both depth and length information. Defects up to 25mm
(1") in depth can be sized accurately.
- All data is stored for backup, audit or review purposes.
- Simple scanning enabling 1 or 2 man operation including abseiler,
diver and ROV deployed.
- Has almost no consumable costs.
Comparison
ACFM is characterised by its use of a locally
unidirectional induced current. In this respect, it is closer to
A.C. potential drop (ACPD) than to
conventional eddy currents. In ACPD, the surface voltages are measured
using contacting electrodes, whereas in ACFM two or more orthogonal
components of magnetic field above the surface are measured.
Crack
Detection / Introduction / Advantages
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