BT20 钛合金电子束热处理残余应力计算

The welding temperature field, the distributions of residual stresses for BT20 thin plates of titanium alloy as welded(AW) and electron beam local post weld heat treatment conditions have been successfully simulated by using ANSYS finite element software. Combined with numerical calculation results, the effects of different electron beam local heat treatment process and different parameters, such as heating width and heating time, on the distribution of welding residual stresses have been analyzed. The results show that the residual tensile stresses in welding seam center can be obviously decreased when the weld is heat treated at backside of the plate. The numerical results also indicate that the magnitude of the longitudinal residual stresses of the welding seam and the vicinity are decreased, and the range of the longitudinal residual stresses increased with the increasing of heating width and heating time.