Abstract
This paper analyzes magnetic flux leakage (MFL) of defects in steel pipe and calculates it by using threedimensional3-D finite element method (FEM). In order to obtain good solutions in the measured area, a novel method that effectively combines the adaptive and man-defined meshing technique is presented. Based on the optimal meshing strategy developed, the MFL testing signals due to defects of different shape are simulated respectively. The characterization of defect shape from the MFL signals is realized by introducing decomposed components and applying the wavelet analysis approach. Such an effect can be employed for characterizing defects in steel pipe, which are inspected using the MFL method in the nondestructive testing industry.
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