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为了得到核电SA508-3钢焊件上各区域热循环曲线及残余应力分布规律,采用有限元软件,通过提出改进的子结构算法,减少模型非线性计算的节点总数,使模拟更加接近真实的厚板焊接过程。模拟结果表明:离热源越近的节点峰值温度越高,冷却速度越快,焊缝上任意节点的热循环曲线基本一致;厚板焊后残余变形关于焊缝中心对称;焊缝外表面的横向残余应力既有压应力,也有拉应力,焊缝内表面为较高的横向拉应力,纵向一直保持较高的残余拉应力,且占主导地位,使得焊件危险部位在沿着焊接方向的焊缝中心附近。
In order to obtain the thermal cycling curve and the residual stress distribution of each region on SA508-3 steel weldment, finite element software was proposed to improve the sub-structure algorithm to reduce the total number of nodes in the model nonlinear calculation and make the simulation closer to the true thickness Board welding process. The simulation results show that the higher the peak temperature of the node near the heat source, the faster the cooling rate, and the thermal cycling curve of any node on the weld is basically the same. The residual deformation after heavy plate welding is symmetrical about the weld center. Residual stress has both compressive stress and tensile stress. The inner surface of the weld seam is high lateral tensile stress, and the residual tensile stress in the longitudinal direction keeps a high level and dominates, making the dangerous parts of the weldment welded along the welding direction Near the center.