Numerical Simulation of Residual Stresses and Strains Fields in Arc Welding with Trailing Heat Sink on Titanium Alloy Sheet

摘要

Welding deformation is undesirable due to decrease of buckling strength and cause errors during the assembly where more rework are need and productivity restriction. In this study numerical simulation have been performed by applying Finite Element (FE). Prediction of cambering distortion in welded titanium alloy sheet has been obtained. Further, attempt were made to eliminate this distortion by applying dynamic spot cooling source technique behind the welding torch, the computed result revealed that the cambering can be eliminated under proper parameter control of this technique such as the distance between the two sources. Transient Residual stress through the thickness exhibit different behavior and magnitude from that in conventional welding, and it is value minimized and balanced by introduced such technique. Explanation of this minimizing mechanism was discussed.