核级支管座焊缝结构堆焊修复数值模拟及分析  

Numerical simulation and analysis on overlay weld repair of structure of nuclear-grade weldolet weld

作　　者：徐少峰 柏忠炼 叶义海[1] 杨彪[1] 薛敬凯[1] 李诗易 XU Shaofeng;BAI Zhonglian;YE Yihai;YANG Biao;XUE Jingkai;LI Shiyi(Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]中国核动力研究设计院,四川成都610213

出　　处：《电焊机》2021年第5期34-41,48,I0004,I0005,共11页Electric Welding Machine

摘　　要：为优化核级支管座焊缝结构的OVERLAY堆焊修复工艺,基于有限元分析软件Abaqus建立三维有限元模型,结合双椭球热源、生死单元技术,采用热-力顺序耦合计算方式对堆焊修复过程进行数值模拟,研究了结构在堆焊修复过程中温度场、焊接变形及残余应力的分布特性。基于计算结果开展了堆焊影响因素的分析,结果表明在原焊缝结构内侧形成了压应力,从焊缝结构内侧逐渐向外到堆焊层表面,压应力逐渐转变为拉应力,且残余应力随着焊接速度的增大而减小,逆-顺交替的焊接顺序可以有效降低残余应力,为优化堆焊工艺提供了重要的参考。In order to optimize the technology of overlay weld repair of structure of nuclear-grade weldolet weld.Based on the Abaqus software,the 3 D finite element model is established,combined with double ellipsoid source model and birthdeath element,the simulation calculation analysis of the overlay weld repair is carried out,the distribution of temperature field and welding deformation and also residual stress on the process of overlay weld repair is analyzed.Based on the calculation results,the analysis of the influencing factors of surfacing welding is carried out.The results show that compressive stress is formed on the inner side of the original weld structure;from the inner side of the weld structure to the surface of the surfacing layer,the compressive stress gradually transforms into tensile stress;and the residual stress decreases continuously as the increase of the welding speed,also the welding deformation and residual stress can be effectively reduced by using the alternating anticlockwise-clockwise welding sequence.The results of this research can provide reference for the optimization of overlay weld process.

关 键 词：OVERLAY堆焊修复 数值模拟 支管座焊缝 残余应力 

分 类 号：TG455[金属学及工艺—焊接]