焊接顺序对X形坡口环焊结构残余应力的影响  

Effects of Welding Sequence on Residual Stress Distribution in Circumferential Welded Joints with X-shape Grooves

作　　者：万海波[1] 王延峰[1] 李强[1] 唐彬 

机构地区：[1]上海发电设备成套设计研究院,上海200240 [2]上海电力股份有限公司吴泾热电厂,上海200241

出　　处：《动力工程学报》2016年第8期664-670,共7页Journal of Chinese Society of Power Engineering

基　　金：上海发电设备成套设计研究院青年创新基金资助项目(201408038Q);国家科技重大专项基金资助项目(2015ZX06002004-001)

摘　　要：利用有限元软件ABAQUS建立了环焊结构的二维轴对称热力顺序耦合有限元模型,并对模型的准确性进行了验证.利用该模型计算了不同焊接顺序下不锈钢圆筒多道对接焊的残余应力分布.结果表明:不同焊接顺序下的残余应力分布趋势基本一致,轴向应力在焊接接头内壁一侧表现为拉应力,而在外壁一侧表现为压应力;环向应力在整个壁厚方向上均表现为拉应力.就应力值大小而言,焊接顺序对残余轴向应力的影响较大,对环向应力的影响则较小.以最大程度降低焊接结构在服役期间发生应力腐蚀开裂的可能性为依据,确定了最佳焊接顺序.Using ABAQUS software, a 2D axisymmetrie sequentially coupled thermal-mechanical finite element model was developed for circumferential welds, of which the accuracy was verified with experimental data. The model was then used to calculate the residual stress in multi pass butt welds of stainless steel cylinder formed under different welding sequences. Results show that the stress distributions formed under different welding sequences reveal essentially the same trend： the axial stress on inner wall side is of the tensile kind and that on outer wall side is of the compressive kind; whereas the hoop stress is of the tensile kind throughout the whole thickness of cylinder wall. As to the stress magnitude, welding sequence affects more on axial stresses than on hoop stresses. An optimum welding sequenee is finally determined from the view of preventing stress corrosion cracking in sevice period to the greatest extent.

关 键 词：X形坡口 焊接顺序 应力腐蚀开裂 有限元模拟 

分 类 号：TK2[动力工程及工程热物理—动力机械及工程]