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Magnetic Flux Leakage testing (MFL) is a technique used for the inspection of tubes made of ferrous materials. This technique will normally be applied as a fast-screening technique if small diameter pitting is expected. Because of limitations to its sizing abilities Magnetic Flux Leakage testing is not often used as a stand-alone technique, and verification by other techniques is recommended. An advantage of MFL Testing for inspections is that it can also be used on fin-fan cooler tubes.
The probe in the MFL Testing technique contains permanent magnets which are utilized to form a magnetic flux field in the tube wall.
Defects will influence the path of the magnetic field and will cause some of the flux to leak out of the tube wall. This leakage field will be picked up by the coils and the Hall-effect sensors in the probe. Size of the leakage field is determined by pull speed of the probe and by the shape, the dimensions and the location of defects. Signals that represent the size of the leakage field and thus the condition of the tube are presented on a computer screen.
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