Analysis of the weld detection using multimodal total focusing method with opposite array

In recent years, weld detection using multimodal total focusing method has gradually developed into an emerging research hotspot in the field of ultrasonic nondestructive testing, but the practical application research of this technology is still relatively lagging behind, for example, there is still no clear guidance on how to select modes to effectively reconstruct the true shape of weld defects and what methods can be used to achieve accurate quantitative analysis of defect images in multimodal images. In response to the above problems, this paper proposed a weld detection method using multimodal total focusing method with opposite array. The proposed full matrix capture method from the opposed array can fully collect the structural information of the tested weld and the directional information of internal buried defects inside the weld; The proposed modal combination method can effectively reconstruct the contour structure of the weld and the true shape of internal buried defects, reducing the difficulty of defect characterization; The proposed modal decomposition method can present the tip diffraction signals of buried defects inside the weld, improving the accuracy of defect quantification.