中文摘要：

针对TIG焊电弧在顺序耦合数值分析中的不足,根据连续性方程、动量守恒方程、能量守恒方程以及麦克斯韦方程建立全耦合数学模型.并运用COMSOL Multiphysics有限元分析软件对三维稳态下、纯氩气保护的TIG焊接电弧进行全耦合条件下的数值分析,得到焊接电弧的温度场、速度场以及电磁场的形态分布特征.结果表明：在全耦合条件下,所得电弧温度、电流密度、等离子体速度的最大值都出现在阴极附近,并在靠近阳极附近的过程中逐渐降低,且温度场成典型的钟罩形,最高温度接近20 000 K,与已有研究结果吻合良好.

英文摘要：

Aiming at the defects of TIG welding arc in the sequential coupling numerical analysis,the fully coupled mathematical model was set up according to the continuity equation,momentum conservation equation,energy conservation equation and maxwell equations.The COMSOL Multiphysics finite element software was used to analyze the TIG welding arc of three-dimensional steady-state under the protection of pure argon,and the characteristics of the formation distribution of temperature field,velocity field and electromagnetic field of the welding arc under the condition of the fully coupled was obtained.The results show that the arc temperature,current density,the maximum speed of plasma appear near the cathode,and reduce gradually in the process of near anode under the condition of the coupling,the temperature field present the classic bell shape,and the highest temperature is close to 20 000 K in good agreement with experimental results.