蜗壳管节组装焊接的数值模拟及工艺优化  

Numerical simulation and process optimization on welding in assembling pipe junction of spiral case

作　　者：赵楠[1] 罗震[1] 单平[1] 刘健[1] 葛凤[1] 韩利哲[1] 郑振太[2] 刘颖 

机构地区：[1]天津大学材料学院,300072 [2]河北工业大学,天津市300130 [3]天津市静海县科委,301600

出　　处：《焊接》2010年第12期28-32,共5页Welding & Joining

基　　金：国家863高科技项目(2008AA04Z136);国家自然科学基金项目(50975197);广东省教育部产学研结合项目(2007A090302105);天津市应用基础及前沿技术研究计划(09JCZDJC24000)

摘　　要：焊接残余应力对水轮机蜗壳结构安全性的影响,主要是疲劳强度和脆性断裂,其分布关系到水轮机运行工作的稳定性与安全性。文中在建立GMAW温度场复合焊接热源模型的基础上,采用大型有限元软件ANSYS对蜗壳管节组装焊接的残余应力进行了数值模拟。并通过进一步的分析,提出了蜗壳管节组装焊接的工艺优化方案。The major influence of welding residual stress on the security of turbine volute is mainly the fatigue strength and brittle fracture.Its distribution is related to the stability and security of turbine operation.Based on the multiple welding heat source model of GMAW temperature field,large-scale finite element software ANSYS is used to numerically simulate the welding process in assembling pipe junction of spiral case. The optimization of welding process was proposed according to the simulated results.

关 键 词：水轮机蜗壳 焊接 数值模拟 工艺优化 

分 类 号：TG453[金属学及工艺—焊接]