有限元分析铜夹具对焊接热过程与应力的影响

Finite element analysis of the effect of copper jig on the welding thermal process and stress

以焊接模拟软件SYSWELD为平台,用双椭球热源模型,对GH4169薄板上的T2铜夹具中铜的使用量进行了焊接数值分析,计算结果表明:贴合铜块后,温度场得到有效的约束,大大缩小了热影响区,其温度场分布效果与高能束焊接类似;随着铜块高度的增加,熔核区域最高温度逐渐降低,铜块高度为4 mm时,温度下降趋势最大,之后逐渐变小;残余应力场因为铜块的贴合,得到有效的改善,超过屈服强度的残余拉应力区域减小,热影响区的残余拉应力在铜块高4 mm时消除。这一模拟结论可以指导如何让铜块在焊接中取得更有效的应用。

Using double ellipsoid model,welding simulations of the copper usage in the T2 copper jig of GH4169 sheet were performed with the commercial software SYSWELD.The results showed that the temperature field had been constrained and heat affected zone were significantly reduced after using copper jig,and the temperature field distribution was similar to that of high energy beam welding.With the copper jig height increasing,the maximum temperature of the nugget area gradually decreased.As the copper jig height reaching 4 mm,the drop extent of temperature was the largest and then gradually decreased with the copper jig height increased;effective improvement of residual stress field had been obtained since the bonded copper jig,and the tensile residual stress region over the yield strength was constrained.The tensile residual stresses of the heat affected zone disappeared when the copper block height was 4 mm.This simulation results could be used as guidance on how to make the copper jig achieve more effective application in welding.