低频相位对双丝双脉冲GMAW熔滴过渡和焊缝成形的影响

为了提高双丝双脉冲熔化极气体保护焊(gas metal arc welding, GMAW)的焊缝成形质量,探究低频相位对熔滴过渡和焊缝成形的影响,在高频同步的前提下分别对低频同步和交替模式进行了试验.通过高速摄影拍摄了低频同步和交替模式的熔滴过渡过程,再结合焊接过程中电流变化,分析了熔滴过渡对熔池的影响机制.结果表明,交替模式可以减少熔滴的碰撞融合,进而减少大体积熔滴对熔池的冲击,减少了飞溅.交替模式比同步模式的焊缝平整性更好,余高方差更小,鱼鳞纹规则,焊缝成形美观.

Effect of low-frequency phase on metal transfer and weld formation in double-wire double-pulse GMAW

In order to improve the weld formation quality in gas metal arc welding (GMAW) and investigate the effect of low-frequency phase on metal transfer and weld formation, experiments were carried out on low-frequency synchronous and alternating modes respectively under the premise of high-frequency synchronous mode. The metal transfer processes of low-frequency synchronous and alternating modes were photographed using a high-speed camera, and the influence mechanism of metal transfer on the weld pool was analyzed combined with the current change during welding. The result shows that the droplet collision and fusion is reduced, thus the impact of large volume droplet on the weld pool is reduced in the alternating mode, and the splash is reduced. Compared with the synchronous mode, the weld formation is more flat and weld reinforcement variance is smaller in the alternating mode. The fish-scale pattern in the alternating mode is more regular than that of synchronous mode, and the weld formation is optimized.