6082-T6铝合金补焊数值模拟

Numerical Simulation of Repair Welding for 6082-T6 Aluminum Alloy

采用焊接仿真软件,对8 mm厚的6082-T6铝合金板进行了焊接及不同深度补焊的数值模拟,研究了焊接及不同深度补焊后的焊接残余应力分布状态,并通过焊接及疲劳试验等对模拟结果进行了试验验证。仿真计算结合试验结果表明:铝合金补焊后焊缝及热影响区焊接残余应力显著增加,补焊深度2、5、8 mm的峰值应力比焊接的分别提高了26%、28%、19%;补焊深度2 mm与补焊深度5 mm的接头焊接残余应力分布状态基本相似,补焊深度为8 mm的接头高应力区宽度明显增加;随着补焊层道数增加,接头抗拉强度略有降低且焊缝抗疲劳性能下降,试验结论与仿真计算结果一致。

Using welding simulation software, thickness of 8turn 6082-T6 Aluminum test panels were simulated or welding and repair welding with different depths to obtain residual stress distribution of the welded joint after welding and after repair welding with different depths. The simulation results were validated by welding test and fatigue test. The simulation results showed that residual stress of the weld and heat affected zone after repair welding was increased observably than after welding, peak stress of repair welding with the depths 2 mm, 5 mm and 8 mm compared with welded joint were increased by 26%, 28% and 19%. The residual stress distribution was consistent of repair welding between the depth 2 mm and 5 mm, but the width of high stress zone increased more significantly with depth 8mm than others after repair welding. As the increase of the welding layer number, the tensile strength decreased slightly and fatigue performance fallen. Test conclusion was consistent with simulation calculation results.