双丝间距对激光-双电弧复合焊接过程稳定性的影响

采用多信息融合技术对激光-双电弧脉冲复合焊在不同双丝间距下的电流信号、电压信号、高速摄像信号进行同步采集,研究双丝间距对焊接过程的电弧行为、熔滴过渡过程及焊缝表面成形的影响,并依据混沌理论和算法,从非线性角度对激光-双丝脉冲MIG焊接过程的电流信号进行了最大Lyapunov指数(LE)计算.结果表明,激光-双丝脉冲MIG焊接过程是一个混沌过程,由于激光光致等离子体和电弧等离子体的相互作用改变电弧的形态和熔滴受力状态,进而影响焊缝成形,在一定的焊接工艺参数下存在最佳双丝间距,在最佳双丝间距下,电弧稳定,焊缝成形良好,且此时最大LE值及其标准方差最小.

Effect of wire-wire distance on arc stability during lasertwin-arc hybrid welding process

Multi-information fusion including current, voltage and high-speed camera signals was used to investigate the effect of wire-wire distance on the arc behavior,droplet transfer and weld formation. The largest Lyapunov exponents of welding current during laser-twin-arc hybrid welding process were numerically evaluated in different wire-wire distances based on chaos theory. The results clearly demonstrate that the laser-twin-arc welding process was in chaotic state. Arc shape and droplet transfer were affected by the interactions of laser-induced plasma and arc plasma in laser-twin-arc hybrid welding process,which consequently influenced the weld formation. The largest Lyapunov exponent and its standard deviation was smallest and the welding process reached steady state in optimal wire-wire distance.