根据毕奥-萨伐尔定律,对惰性气体钨极保护-熔化极惰性气体保护(Tungsten inert gas-metal inert gas, TIG-MIG)复合焊TIG-MIG电弧间相互作用模型进行改进;结合不同倾斜电弧下电流密度分布的自适应模型,建立TIG-MIG复合焊的电弧力-热模型。对不同焊接电流下TIG-MIG复合焊电弧倾角展开计算,分析复合焊电弧间相互作用力对工件上热流密度分布和焊缝成形的影响,发现两电弧之间存在的排斥力能够增加TIG电弧的垂直度,从而提高TIG电弧热流密度,同时MIG电弧是影响TIG-MIG复合焊焊缝成形的主要因素。研究复合焊焊枪间距和两焊枪的前后位置对焊接过程的影响,发现TIG焊枪在前、MIG焊枪在后的方式更有利于焊接过程稳定。计算结果与试验结果的对比表明,所建立的模型能够较好地描述TIG-MIG复合焊接物理过程,这对优化其焊接工艺参数具有一定的指导意义和实际应用价值。
Considering Biot-Savart law, the models for arcs interaction during Tungsten inert gas-metal inert gas (TIG-MIG) hybrid welding process are improved. Base on the adaptive current density mathematical model of inclined arc, the heat-force models for TIG-MIG hybrid welding are established to study the interacting forces between TIG and MIG arcs by analyzing the distribution of heat flux and weld formation. The inclined angles of two arcs under different welding currents are also calculated. The results indicate that the repelling force between two arcs could increase verticality of TIG arc, which will develop the heat density of TIG arc. And the behavior of MIG energy is the main factor of bead forming process during TIG-MIG hybrid welding. Then the effect of distance between TIG and MIG torches and their relative front or back position on welding process is estimated. It is found that TIG leading in TIG-MIG hybrid welding is beneficial to stabilize the welding process. Good agreement is observed between numerical predictions and experimental data, the results show that these numerical models can reflect TIG-MIG hybrid welding process well and can be used to optimize its welding parameters.
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