Testing Method Combing EMAT with Eddy Current

The bodywork, especially the bottom of amphibious armored vehicles was often destructed for its adverse working environment. A testing method which combined EMAT(Electromagnetic Acoustic Transducer) with eddy current testing technology was proposed. The surface and sub-surface defects could be tested by eddy current testing method using the eddy current inducted by EMAT without adding the special exciting circuits and coils. A detection system and combination probe was designed. Experiments on the steel specimens of amphibious armored vehicles with surface defects and internal defects were carried out respectively. The results showed that both the surface and internal defects of the specimens could be detected with the method. More fully information could be got with the combination method than using single EMAT or eddy current testing.