激光功率对激光-双丝脉冲MIG复合焊接电弧形态及熔滴过渡的影响

Effect of laser power on arc behavior and metal transfer in laser-twin-wire pulsed MIG hybrid welding process

通过搭建激光-双丝脉冲MIG复合焊接系统,利用高速摄像与电信号采集系统对激光-双丝脉冲MIG复合焊接在不同激光功率下的电压电流信号及高速摄像信号进行同步采集,研究激光功率对焊接过程的电弧形态、熔滴过渡过程的影响.结果发现,由于激光等离子体与电弧等离子体的相互作用,电弧形态和熔滴受力状态发生改变.随着激光功率的增大,激光对电弧的吸引能力增强,促进熔滴过渡的等离子流力竖直向下的分力减小,熔滴过渡频率降低.

Laser-twin-wire pulsed MIG hybrid welding is a new welding technology which combines laser welding and twinwire MIG welding. As one of the most important factors in this technology,laser power has significant effect on the welding procedure and properties of joint. A laser-twin-wire pulsed MIG hybrid welding system was established to investigate the effect of laser power on arc behavior and metal transfer in this process.High-speed photography system with synchronous electrical signal,including current and voltage signals,were adopted to record the arc behavior and metal transfer during welding. The results showed that the arc shape and stress status of the droplet were affected by the interaction between laser-induced plasma and arc plasma. With the increase of laser power,the laser-arc attraction was enhanced,the component force of plasma stream force in the vertical downward which could promote droplet transfer reduced. As a result,the droplet transfer frequency decreased.