Abstract
Circumferential magnetization of the thick wall steel pipe is carried out for the inspection of longitudinal defects in magnetic flux leakage testing. For high precision magnetic flux leakage testing, magnetic field distribution along the axial direction must be uniform, thus a new type of pole shoe structure is proposed in this paper to enlarge the uniformly magnetized area. Thick wall steel pipes are hard to be magnetized to near saturation, especially when the new pole shoe is used, which makes difficult for the magnetic sensors to pick up the magnetic leakage field. Therefore, the relationship between the magnetic flux density of the detection zone and the dimensions of the magnetizer has been studied by finite element simulation. These results are helpful in the design of circumferential magnetizer.
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