论文部分内容阅读
铝合金短路过渡熔化极惰性气体保护焊(MIG)焊缝成形较差、熔深浅。利用高速摄像与电信号同步采集系统,研究了铝合金MIG焊短路过渡时的熔滴过渡特性,解释了铝合金采用短路过渡焊接时焊缝成形差的原因。采用激光与电弧旁轴复合焊接形式,发现激光的加入改变了铝合金短路过渡的熔滴特性,当激光功率在某一临界值以下时,熔滴过渡稳定,焊缝成形得到显著改善;当激光功率超过临界值时,熔滴过渡不稳定,焊缝成形改善效果不明显。对比传统MIG和激光-MIG焊在采用短路过渡焊接铝合金时的焊缝宏观形貌,激光的加入使熔滴铺展良好,余高降低,熔深增加。研究表明,激光的加入,将工程上焊接铝合金时不常应用的短路过渡MIG焊接形式变得有实际应用价值。
Aluminum alloy short circuit transition melting inert gas shielded welding (MIG) weld forming poor, shallow penetration. Using the high-speed camera and electrical signal acquisition system, the droplet transfer characteristics of aluminum alloy MIG welding during short-circuit transition were studied, and the reasons for the poor weld formation during aluminum alloy short-circuit transition welding were explained. By laser and arc paraxial composite welding, it was found that the addition of laser changed the characteristics of the droplet during the short circuit transition of the aluminum alloy. When the laser power was below a certain critical value, the droplet transfer was stable and the weld formation was significantly improved. When the laser When the power exceeds the critical value, the droplet transfer is unstable and the effect of improving weld formation is not obvious. Compared with the conventional MIG and laser-MIG welding, the macro-morphology of the weld during the short-circuit transition welding of the aluminum alloy was observed. The addition of laser enhanced the spread of the droplet and the residual height and the penetration depth. The research shows that the addition of a laser has practical application value in the form of short-circuit transition MIG welding, which is not often used in engineering welding of aluminum alloy.