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在浮力、电磁力和表面张力梯度共同作用下对固定电弧脉冲ＴＩＧ焊接熔池中的流体流动与传热的动态过程建立了数学模型。在控制方程组强烈耦合的情况下，将处理导热问题边界条件的附加源项法应用于处理动量边界条件，同时采用交替方向隐式迭代法及双块修正技术，使求解非稳态控制方程组的迭代收敛速度大为提高。计算结果展示了脉冲ＴＩＧ焊接过程中，随着焊接电流的周期性变化，熔池流场与热场的周期性变化规律以及熔池形成的动态发展过程。根据该模型得出的计算结果与试验测定结果吻合程度良好。
Under the combined action of buoyancy, electromagnetic force and surface tension gradient, a mathematical model is established for the dynamic process of fluid flow and heat transfer in a fixed arc pulse TIG welding pool. In the case of strong coupling of governing equations, the additional source term method that deals with the boundary conditions of thermal conduction problems is applied to handle the momentum boundary conditions. The alternating direction implicit iteration method and the two-piece correction technique are used to solve the unsteady governing equations The iterative convergence rate is greatly improved. The results show that the periodic variation of the welding current, the periodic variation of the flow field and the thermal field, and the dynamic development of the weld pool during the pulsed TIG welding process. The calculated results based on this model are in good agreement with the experimental results.