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三丝GMAW是一种有效提高焊接速度的焊接方法,但电流配比对最后的焊缝成形具有重要的影响,焊接工艺实验表明适当提高引导弧的电流有利于形成形态良好的焊缝。本文针对三丝电流配比对焊缝成形的影响,采用数值模拟方法,研究了不同电流配比对焊缝成形的影响机理,揭示了三丝GMAW不同电流配比下的熔池形态及流动场的不同分布规律。研究结果表明:适当提高引导弧的电流可形成互相连通、熔宽分布均匀的三丝GMAW共熔池,有利于形成明显的“推-拉”流动方式,减缓熔池的后退效应,降低凝固速度,增强焊接过程的稳定性,有利于形成均匀一致的焊缝。
Three-wire GMAW is a kind of welding method which can effectively improve the welding speed. However, the current ratio has an important influence on the final weld formation. The welding process experiment shows that proper raising of the current of the pilot arc is favorable for the formation of a good weld. In this paper, according to the influence of the three-wire current ratio on the formation of weld, the influence mechanism of different current ratio on the formation of weld is studied by numerical simulation. The shape and flow field of molten pool under three-wire GMAW current ratio are revealed The different distribution rules. The results show that the appropriate current of the arc can be formed to form a three-wire GMAW eutectic pool with interconnected and uniform melt distribution, which is beneficial to the formation of obvious “push-pull” flow pattern, slow down the backward effect of the molten pool and reduce Solidification speed, enhance the stability of the welding process is conducive to the formation of a uniform weld.