单束与双束串行激光填丝焊特性对比

以铝合金为研究对象,研究了双束串行激光填丝焊不同能量比对焊缝成形及焊缝气孔率的影响,并与单束激光填丝焊工艺进行对比。进一步借助高速摄像机对双束串行激光填丝焊能量比R为20/80以及单束激光填丝焊的熔池、匙孔以及等离子体的变化进行对比分析,获得了双束串行激光填丝焊能量比R为20/80时焊缝气孔率降低的原因。结果表明,对于双束串行激光填丝焊,当能量比R为20/80时焊缝气孔率较低。与单束激光填丝焊相比,双束激光填丝焊能量比R为20/80的焊缝气孔率降低了38%,而且焊接过程中焊丝熔化后沿熔池边缘流入,可大幅降低对匙孔的冲击作用,匙孔始终处于张开状态,焊接过程中等离子体的形态波动相对较小,表明焊接过程的稳定性较好。

Comparative Study on Characteristics Between Single Beam and Tandem Dual Beam Laser Welding with Filler Wire

In this paper, the influence of different energy ratio on the aluminum alloy weld formation and the porosity during the dual-beam laser welding with filler wire was studied. And the comparison with the single-beam laser welding with filler wire process was studied. By using high speed camera, the shapes of molten pool, keyhole and plasma on the welding process were analyzed during the energy ratio R was 20/80 in tandem dual-beam laser welding with filler wire and the single-beam laser welding with filler wire. The reason for reducing the porosity of the weld was obtained when the energy ratio was 20/80 in tandem dual-beam laser welding with filler wire. The results showed that when the energy ratio R was 20/80, the weld porosity of the dual-beam laser wel-ding with filler wire was low. Compared with single-beam laser welding with filler wire, when energy ratio R was 20/80 during dual-beam laser welding with filler wire, the weld porosity rate was decreased by 38%, and the melted liquid filler flowed along the edge of the molten pool could greatly reduce the impact for the keyhole, the keyhole was always in the open form in the welding process, the fluctuation of plasma shapes were relatively small, it showed that the stability of welding process was better.