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为展示FSW在焊接残余应力方面的优势和特点,采用顺序热力耦合模型模拟FSW和TIG两种焊接构件的残余应力,在与已有文献验证对比的基础上,讨论和对比焊后热处理工艺对残余应力分布的影响。结果表明:FSW的焊后残余应力低于TIG焊接,在焊接厚度方向上,FSW的残余应力有较明显的变化,而TIG焊的残余应力变化很小;热输入功率的改变对TIG纵向残余应力的影响相对较小,而对FSW的影响较大;随着热处理温度的升高,焊后热处理对残余应力的降低作用越明显;同样的焊后热处工艺对TIG焊的残余应力降低更为明显。
In order to show the advantages and characteristics of FSW in welding residual stress, the sequential thermal coupling model was used to simulate the residual stress of FSW and TIG welding components. Based on the comparison with the existing literatures, the effects of post-weld heat treatment process on residual Effect of stress distribution. The results show that the post-weld residual stress of FSW is lower than that of TIG welding, the residual stress of FSW has obvious change in the direction of welding thickness, while the residual stress of TIG welding has little change. The change of thermal input power affects the TIG longitudinal residual stress The impact on post-weld heat treatment is relatively small, while the impact on FSW is larger. With the increase of heat treatment temperature, the effect of post-weld heat treatment on residual stress reduction is more obvious. The same post-weld heat treatment reduces the residual stress of TIG welding even more obvious.