Tandem welding increases productivity in gas metal arc welding (GMAW). We investigate asynchronous DC–AC pulse tandem GMAW. We analyse welding arc and droplet behaviour for two tandem welding processes, DC standard-AC pulse and DC pulse-AC pulse. Spatters were generated by attractive and repulsive arc interferences. The attractive arc interaction hinders stable droplet transfer and the repulsive one can induce short-circuiting of the hanging droplets. We examine the effect of process parameters on droplet transfer and spatter generation. During DC pulse-AC pulse tandem GMAW, high peak current of the DC pulse increases arc stiffness and enhances droplet detachment. The observed consistency in arc length, droplet formation, and droplet transfer confirms the stability of asynchronous DC pulse-AC pulse tandem GMAW.

中文翻译：

---

DC-AC 脉冲串联气体保护金属电弧焊中的熔滴转移和飞溅产生

串联焊接提高了气体保护金属电弧焊 (GMAW) 的生产率。我们研究了异步 DC-AC 脉冲串联 GMAW。我们分析了两种串联焊接工艺（直流标准-交流脉冲和直流脉冲-交流脉冲）的焊接电弧和熔滴行为。飞溅是由吸引和排斥的电弧干扰产生的。吸引力的电弧相互作用阻碍了稳定的液滴转移，而排斥性的电弧相互作用会导致悬挂液滴的短路。我们研究了工艺参数对液滴转移和飞溅产生的影响。在直流脉冲-交流脉冲串联 GMAW 期间，直流脉冲的高峰值电流增加了电弧刚度并增强了熔滴脱离。观察到的电弧长度、液滴形成和液滴转移的一致性证实了异步直流脉冲-交流脉冲串联 GMAW 的稳定性。