采用双束CO2激光进行了铝合金双光束焊接工艺试验，研究了双光束并行与串行排列两种模式焊接时的焊缝成形、气孔含量及接头强度等焊接特性，同时分别从同轴、旁轴两个方向监测了双光束焊接过程中熔池表面形态与等离子体特征，并与传统单束激光焊进行了对比分析。试验结果证明，双光束焊接过程等离子体更加稳定，尺寸也更小，因而获得了很好的焊缝成形与接头性能。相比而言，双光束并行焊接获得的焊缝性能更优，但会一定程度降低焊接熔深。

Experiments of dual-beam CO2 laser welding aluminum alloys were conducted. The weld appearance, porosity content and joint strength with parallel and serial dual-beam laser welding were investigated. CCD and CMOS image sensors were respectively used to monitor the metal pool and plasma from both paraxial and coaxial directions. The results in above aspects of single-beam and dual-beam welding were simultaneously compared. The results indicate that dual-beam laser welding aluminum alloys can reduce the size and therefore increase the stability of plasma in comparison with single-beam laser welding, which usually results in better weld shaping. A comprehensive comparative analysis on the parallel and serial dual-beam welding shows that the former is more favorable in weld shaping, but it will decrease the penetration in some degree.