换热器管子与管板焊接接头残余应力的数值模拟  

Numerical Simulation of Welding Residual Stress of Tube and Tube-sheet Welded Joints

作　　者：张莹莹[1] 张翠翠[1] 李帆[1] 

机构地区：[1]辽宁石油化工大学机械工程学院,辽宁抚顺113001

出　　处：《热加工工艺》2009年第7期120-122,共3页Hot Working Technology

摘　　要：基于ANSYS平台对油浆蒸发器伸出管板角接头的焊接残余应力进行数值模拟,获得了焊接接头的残余应力分布,成功的解决了焊缝的环形行走和不同部位之间的热传导问题。有限元分析结果表明,接管环焊缝的残余应力分布具有局部性的特点,高应力危险区集中在焊缝周围的管板热影响区。本文焊接条件下管接头环焊缝最大径向焊接残余应力出现在临近焊接热影响区的焊缝根部,对导致出现应力腐蚀开裂起主要作用。合理的预热措施使最大环向焊接残余应力降低20%左右,同时管桥表面应力也得到明显改善,这就有效降低了管板表面出现应力腐蚀开裂的风险。Do some research on numerical simulation of welding residual stress of slurry steam generator tube extend out end of tube sheet welded joint based on ANSYS. Finite Element Analysis showes that preheated can effective reduce the traverse residual stresses, but have a definite effect on longitudinal welding residual stress. By the welding conditions, the maximum traverse residual stresses present to weld root next to the welding heat affected zone, which play a major role in stress corrosion cracking. The preheating reduce the maximum traverse residual stresses by 20%. The traverse residual stress distribution had be improved obviously, especially the traverse residual stress reduced on the tube bridges which can reduce risk on stress corrosion cracking.

关 键 词：ANSYS 焊接残余应力 数值模拟 

分 类 号：TG404[金属学及工艺—焊接]