采用激光束与电弧复合焊接AZ31B镁合金,研究了这种复合热源对焊接熔深、表面成型的影响,探索了激光-电弧不同复合方式对焊接过程中电弧稳定性的影响。结果表明,激光束与焊接电弧共同组成的复合热源在正向焊接镁合金时形成的焊接熔深,比单独采用钨极氩弧焊(TIG)焊接增加了1倍左右,同时复合热源焊接电弧稳定性也较钨极氩弧焊接提高了1倍以上,是一种理想的镁合金焊接方法;而当激光-电弧复合热源反向焊接时,电弧稳定性较正向焊接进一步增大。对复合热源的电弧稳定性和激光吸引电弧的现象以及熔深增加的机理进行了讨论。

Hybrid laser-arc welding was used to join AZ31B Mg alloy. Weld penetration, surface formation were researched, and effect of arc stability was investigated in positive and negative welding directions during hybrid welding. The results showed that the weld penetration was increased by more than about one times and the weld stability increased by more than one times, compared the positive direction hybrid welding with gas tungsten arc welding only. It has been proved that the welding for magnesium is a perfect process. For negative direction hybrid welding, welding stable was further improved, but weld penetration was not increased. In addition, arc stability in hybrid welding and arc root location were discussed.