Simulation Research on Defect Detection of Plate Weld Based on Sensitivity Analysis

In order to improve the efficiency of traditional local non-destructive testing method in detecting the defects of large plate welds and obtain the equivalent mechanical parameters of weld defects, a method for detecting plate weld defects based on local vibration area sensitivity analysis is proposed. This method does not need to pay attention to the specific form of the weld defect, and it regards the defect as a reduction in the local Young's modulus. A plate welding model was established in ABAQUS finite element software to simulate the detection process of different defect positions and different defect levels. The results show that the sensitivity matrix constructed with the elastic modulus of 5% change can be applied to the detection of defects with a degree of 3% to 20%. It shows that the proposed method can be used to locate and quantify weld defects with sufficient accuracy.