Abstract
Lattice sandwich metallic plate (LSMP), a new multifunctional material with special advanced mechanical behaviours, has potentials to be applied to many important industries. Defects in welding joints of the LSMP may significantly reduce the material strength. Eddy Current Testing (ECT) is considered as a powerful NDT tool for the detection and sizing of defects in LSMP. The welding zone noises in ECT signals swarm the crack signals and may reduce the reliability of the quantitative defect evaluation. To overcome this difficulty, an inversion algorithm based on the strategy of multi-frequency ECT is proposed in this paper for sizing of welding zone crack. Good consistency of the reconstruction results is obtained for both simulated and measured ECT signals, which proves the validity of the proposed scheme.
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