焊接工艺对厚壁核压力容器焊接残余应力的影响  

Influence of welding procedure on the residual stress of the welded thick-wall nuclear pressure vessel

作　　者：张敏[1] 陈陆阳[1] 李继红[1] 张美丽[1] 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《兵器材料科学与工程》2011年第2期16-19,共4页Ordnance Material Science and Engineering

基　　金：陕西省教育厅自然科学基金资助项目(00k904);陕西省重点学科建设专项资金资助项目(00X901)

摘　　要：应用热弹塑性有限元理论,采用"生死单元"技术,模拟在多道焊焊接工艺条件下,厚壁核压力容器与接管间马鞍形焊缝处焊接残余应力的分布规律,着重分析坡口型式和计算中所采用的"焊接层数"对残余应力计算结果的影响。结果表明:采用双U型坡口相比于I型坡口有利于降低等效残余应力;计算中采用不同的"焊接层数"对双U型坡口焊缝焊接残余应力的计算结果存在一定影响。Based on the thermal elastic-plastic finite-element theory,this paper adopted the technology of Element Birth and Death to simulate the distribution regularity of the welding residual stress at the saddle-shaped weld between the thick-wall nuclear pressure vessel and the connection tube,and focused on the effects of the groove type and the welding layers employed in calculation on the residual stress.The results show that it is of more help in reducing equivalent residual stress to adopt the double-U groove than to use I groove,and different welding layers adopted in calculation have certain effects on the welding residual stress of the double-U groove.

关 键 词：有限元 生死单元 压力容器 残余应力 坡口 

分 类 号：TG407[金属学及工艺—焊接]