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利用自行研制的不锈钢活性剂FS12对A-TIG焊熔深增加机理进行研究。用PHOENICS软件模拟了有、无活性剂时氧元素质量分数、电弧收缩效应等对熔池速度场和温度场的影响。计算结果表明,无活性剂时,熔池液态金属从中心流向四周,再从四周流向熔池底部,形成宽而浅的熔池形状;有活性剂时,熔池液态金属从熔池边缘流向中心,引起向内的两个涡流在熔池上表面中心相遇,汇合后流向熔池中心底部,形成窄而深的熔池形状:表面张力梯度变化是熔深增加的主要原因,电弧收缩影响熔宽,对熔深增加也有一定的影响,但不是主要原因。熔池形状的数值模拟结果与试验结果吻合良好。
The mechanism of increasing the penetration depth of A-TIG welding was studied by using the stainless steel active agent FS12 developed by ourselves. PHOENICS software was used to simulate the effect of oxygen content and arc shrinkage on the velocity field and temperature field of molten pool with and without active agent. The results show that when the surfactant is inactive, the liquid metal flows from the center to the periphery and flows from the periphery to the bottom of the bath to form a wide and shallow pool shape. When the active agent is present, the liquid metal in the bath flows from the edge of the bath to the center , Resulting in the two eddy currents in the center of the weld pool meet, confluence flow to the bottom of the pool center, forming a narrow and deep pool shape: surface tension gradient is the main reason for the increase in penetration depth, arc shrinkage affect melting width, Increased penetration also has some impact, but not the main reason. The numerical results of the shape of the molten pool are in good agreement with the experimental results.