通过试验研究了在Nd:YAG激光+脉冲金属熔化极气体保护焊电弧(P-GMA)复合热源焊接过程中激光对熔滴脉冲过渡频率和脉冲电流的影响。研究结果表明,对于熔滴脉冲过渡,电流较小时,将激光能量加入到脉冲金属熔化极气体保护焊(P-GMAW)中,将会有助于提高熔滴过渡频率和焊接过程的稳定性;而在电流较大时,激光能量的加入将会不同程度地降低熔滴过渡频率;而激光能量的加入,对P-GMAW电流具有一定的减小作用,但其影响很弱。分析认为,激光通过材料蒸发反冲作用力和激光致等离子体与电弧等离子体的相互作用两种途径来影响熔滴过渡频率,而仅通过两种等离子体之间的相互作用来影响P-GMAW电流。

The effect of laser on the frequency of metal transfer and welding current in Nd:YAG laser+P-GMA (pulsed gas metal arc) hybrid welding was studied. The results show that the addition of laser energy into P-GMAW (pulsed gas metal arc welding) process can help to increase the frequency of metal transfer at the lower welding current and decrease its frequency at higher welding current. The addition of laser energy can reduce the welding current of P-GMAW,but its effect is very weak. The analyses indicate that the laser exerts the influence on metal transfer by the vaporization of material and the interaction between laser induced plasma and arc plasma,and its effects on welding current are exerted by the interaction between laser induced plasma and arc plasma.