Detection of wall thinning in carbon steel based on pulsed eddy current testing method and sizing of defect using inversion approach

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Quantitative non-destructive evaluation of wall thinning of inner side in carbon steel piping is a difficult and urgent issue for safety of nuclear power plants, especially compared to NDT of non-magnetic material. In this research, The feasibility of the magnetic saturation PECT method for wall thinning detection in carbon steel piping is proposed and validated.Firstly, the simulated polarization approach is adopted for the calculation of the static magnetic field distribution generated by the electromagnetic magnet, then the material permeability distribution is predicted according to the B-H curve of the targeted material. Finally the efficient magnetic saturation PECT forward simulation tool is updated for the carbon steel based on the Ar (reduced A) method and the Fourier series strategy to validate the wall thinning detection in carbon steel material.