Numerical Optimization of Groove Shape and Welding Sequence on T-joint Multi Passes Welding and Validation by Welding Test

抄録

In case of welding of thick plates, it is necessary to apply appropriate groove shape for preventing welding distortion and defects. It is difficult to define an appropriate welding condition of inexperienced structure. In this study, the optimization method for welding condition on T-joint weld was investigated. The groove shape (groove angles and position of root edge) and a welding sequence were defined as design variables. The distortion was defined as the objective function and it was minimized. The response surface methodology was used for this optimization. For the purpose of confirming the validity of this optimization method, numerical analysis and actual weld experiment with optimized welding condition were performed. As a result of numerical analysis, the residual distortion was sufficiently small. Moreover, it was confirmed that the residual distortion of actual weld experiment was smaller than acceptable value.