Abstract
The non-destructive detection of the weld internal defects is still worth to study. In this paper, a new method to detect weld internal defects by using the laser ultrasonic technique. The numerical simulation analysis is used to investigate whether the weld has quality defects. This paper detailed analysis the interaction between the LR-wave generated by laser and the internal defects of the weld to both sides of the weld through the B-scan image. It is proposed to use the difference B-scan image with or without internal defects to separate the LR-wave. This method can effectively separate the Lr-wave, and can provide a basis for the judgment of the internal defects of the weld. The proposed method may provide a useful way to estimate the internal defects of the weld.
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