焊接顺序对Q690钢T型接头残余应力和变形的影响

利用ABAQUS有限元软件分析了Q690钢T型接头焊接顺序对接头残余应力和变形的影响，建立了K型坡口双面双道焊的温度场与应力场仿真模型.分析结果表明:对于残余应力，先焊完一侧再焊另一侧的方案三所产生的整体残余应力水平最小，焊缝区高应力范围也较小，而两侧交替焊接的方案一和方案二的整体应力水平稍大，焊缝区高应力范围也较大；对于焊接残余变形，则是两侧交替焊接的方案一与方案二变形较小，并且两侧变形较为对称，先焊完一侧后焊另一侧的方案三变形最大并伴有整体的倾斜变形.

Influence of Welding Sequence on Residual Stress and Deformation of T-Joint of Q690 Steel

The influence of welding sequence on residual stress and deformation of T-joint of Q690 steel was analyzed by using ABAQUS. The simulation models of temperature field and stress field of K-groove double-sided two-layer two pass welding was established. The calculation results show that the welding sequence has a certain influence on the residual stress and deformation. For the residual stress， the scheme 3， in which one side was welded first and then the other side， produced the minimum residual stress， and the high stress range of the weld area was also small. The overall stress level of alternative welding scheme 1 and scheme 2 was slightly larger， and the high stress range of the weld area was also larger. For welding residual deformation， the deformation of scheme 1 and scheme 2 was smaller， and the deformation of both sides was symmetrical， and the deformation of scheme 3 was the largest， accompanied by the overall tilt deformation.