激光能量对Nd:YAG激光-短路MAG复合热源焊接过程的影响

Effect of laser power on welding process stability of Nd:YAG laser-short circuit MAG hybrid welding

针对低碳钢材料,通过改变加入的激光功率来研究激光能量因素对激光-短路MAG复合热源焊接过程稳定性和焊缝成形的综合影响.结果表明,对于特定条件下的激光-短路MAG复合热源焊接过程稳定性,存在最佳的激光功率范围,并不是加入的激光功率越大,焊接过程越稳定;从激光-短路MAG复合热源焊缝成形和焊接过程稳定性角度,按照加入的激光能量大小,可以把激光-短路MAG复合热源分为小功率激光能量稳定电弧阶段、过渡阶段和大功率激光能量增加熔深阶段.并针对各个阶段,从熔滴受力角度分析了激光能量因素对焊接过程的影响机制.

The effect of laser power on welding process stability and the formation of weld were investigated during Nd:YAG laser-short circuit MAG hybrid welding in this paper.The results showed that laser power was an important welding parameter which could affect welding process stability.When short-circuit MAG welding process combined with laser power,welding process would become stable.But it was not true that welding stability would rise with laser power increased.The most stable welding process presented when laser power was lower.So according to the laser power,Nd:YAG laser-short circuit MAG hybrid welding could be classified into three stages,the stabilizing arc stage with lower laser nower,transition stage and deepening weld penetration stage with higher laser power.Finally,the reasons for how laser made arc to be more stable were analyzed.