低合金钢深熔TIG水冷焊温度场数值模拟  

Numerical simulation of temperature fields in backside water-cooling keyhole TIG welding

作　　者：黄逸飞 罗震[1] 王证茗 冯悦峤 

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《焊接学报》2017年第11期103-107,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51275342;51405334)

摘　　要：文中采用ANSYS有限元软件,建立Q345低合金钢的深熔TIG焊接温度场有限元模型,采用双椭球热源与圆柱体热源的组合热源形式,对焊接过程中温度场进行模拟,得到与试验结果吻合度很高的模拟结果,验证了有限元模型的正确性.通过进一步对比研究发现,采用背部水冷增强散热的处理,能大大减小熔池体积,同时使得根部焊道液态金属迅速冷却,有利于维持熔池区受力平衡,保证焊接小孔稳定,基于此提出水冷焊改善工艺的机理.Process experiment shows the backside recycling water-cooling benefits to low alloy steel in keyhole TIG welding. Based on ANSYS finite element software,a combined heat source model( double ellipsoid heat source + cylinder heat source) is established to describe low alloy steel Q345 welding temperature fields in keyhole TIG welding. and The simulated results are well consistent with experiment results,therefore the correctness of the finite element model is verified. Further comparative study found that backside water-cooling method enhanced heat dissipation,leading to a greatly reduced molten pool. Meanwhile,a molten metal of root weld pass cooling rapidly,which benefits to the force balance of weld pool and maintains the stabilization of keyhole. Based on above,the mechanism of backside water-cooling in improving welding process is put forward.

关 键 词：数值模拟 深熔TIG 背面水冷 

分 类 号：TG453.9[金属学及工艺—焊接]