Q345R钢焊接接头不同部位补焊残余应力的有限元分析  

Residual stress analysis of repair welding at different zone of Q345R welded joint based on finite element simulation

作　　者：沈利民[1] 巩建鸣[1] 余正刚[1] 涂善东[1] 

机构地区：[1]南京工业大学机械与动力工程学院,南京210009

出　　处：《焊接学报》2009年第9期57-60,64,共5页Transactions of The China Welding Institution

基　　金：江苏省"六大人才高峰"基金资助项目(06-D-035);江苏省工业装备数字制造及控制技术重点实验室基金项目(BM2007201)

摘　　要：Q345R钢由于具有良好的性能而广泛应用于压力容器与管道的制造,其焊接接头部位常出现裂纹,焊接残余应力是主要影响因素之一.利用有限元软件ABAQUS,开发了一个顺次耦合的热应力计算程序,对焊接接头焊缝区域与热影响区补焊的残余应力分布进行了数值模拟,得到了补焊残余应力的分布位置及大小.结果表明,补焊后,残余应力值比焊态下残余应力值有所增加,纵向应力和横向应力值增加幅度不同.为此,对实际补焊修复提出了建议,为优化补焊工艺、控制残余应力提供了参考依据.Because of its excellent properties,Q345R alloy is extensively used in the manufacture of pressure vessels and pipes.However,cracks often generate in a weldment made of this alloy for welding residual stress.Using finite element analysis software ABAQUS,a sequentially coupled welding thermal-stress procedure was developed to calculate the repair welding residual stress for different zones of Q345R welded joint.3D repairing welding residual stress field was obtained and analyzed.The result shows that residual stress caused by repair welding increases than before,and longitudinal stress and transversal stress do not increase uniformly.The analysis from simulation results provides theoretical references for optimizing the repair welding parameters and controlling the repair welding stress.

关 键 词：Q345R钢 焊接残余应力 补焊 数值模拟 有限元软件ABAQUS 

分 类 号：TG115.25[金属学及工艺—物理冶金]