双TIG焊接电弧数值分析  

Numerical Simulation of Two TIG Welding Arc

作　　者：王新鑫[1,2] 罗怡 李春天[1,2] 迟露鑫 WANG Xinxin;LUO Yi;LI Chuntian;Chi Luxin(School ofMaterials Science and Engineering,Chongqing University of Technology,Chongqing 400054,China;Chongqing Municipal Engineering Research Center of Higher Education Institutions for Special Welding Materials and Technology,Chongqing 400054,China)

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400054 [2]重庆市特种焊接材料与技术高校工程研究中心,重庆400054

出　　处：《热加工工艺》2020年第7期133-138,145,共7页Hot Working Technology

基　　金：国家自然科学基金资助项目(51705054);重庆市教委科学技术研究项目(KJ1600903);重庆理工大学星火计划资助项目(2015XH20)。

摘　　要：针对双TIG电弧建立了包括钨极的双TIG焊接电弧数学模型。通过数值求解,得到了不同电流分配条件下双TIG焊接电弧的温度场、流场和电磁场等重要结果,并对等离子流剪切力和电弧压力进行分析。研究表明,在总电流不变的情况下,当钨极分配电流相同时,电弧温度场、流场和电弧压力等呈对称分布;当钨极分配电流不同时,电弧高温区域更靠近大电流钨极,但电弧整体上向小电流钨极一侧偏移。电流分配相同时,母材表面的电弧压力和等离子流拉力与相同条件下的单TIG电弧相比均显著下降,而钨极分配电流不同时,电弧压力和等离子流拉力峰值偏向于小电流钨极一侧。模拟结果与已有的研究结果吻合良好。A mathematical model including tungsten electrodes was developed for two TIG welding arc. The temperature,flow and electromagnetic fields of two TIG welding arc were obtained under different current distribution conditions, and the plasma shear force and arc pressure was analyzed. It is shown that when the total current is constant and the current for the each electrode is equal, the arc temperature field, flow field and arc pressure are symmetrically distributed. While the current for the each electrode is unequal, the high temperature area of the arc plasma is more closed to the electrode with higher current, and the arc shifts to the side of electrode with lower current. When the current for the each electrode is equal, the arc pressure and plasma tensile force at the anode surface reduce much compared to that of the single TIG arc, while the current for the each electrode is unequal, the peak values of them shift to the side of electrode with lower current. The simulated results are in fair agreement with the existing data.

关 键 词：双TIG 电弧 数值模拟 电弧压力 等离子流拉力 

分 类 号：TG444.74[金属学及工艺—焊接]