基于脉冲电流参数的铝合金脉冲MIG焊过程控制

Pulsed current parameters based control of aluminum alloy pulsed MIG welding process

铝合金脉冲MIG焊弧长稳定性直接影响焊接过程稳定性及焊缝成形,为使其焊接过程稳定,获得高质量焊缝,通过焊接工艺试验研究了脉冲电流参数变化对弧长稳定性的影响规律,建立了铝合金脉冲MIG焊弧长与脉冲电流参数间的动态变化数学模型,并利用Matlab/Simulink软件进行了弧长对脉冲电流占空比、脉冲电流频率变化的动态响应仿真分析,同时进行了控制脉冲电流占空比、频率来稳定弧长的平板堆焊工艺试验研究.结果表明,所建立的数学模型能很好地反映铝合金脉冲MIG焊过程,通过调节脉冲电流占空比、频率参数可实现铝合金脉冲MIG焊稳定焊接,获得成形美观的焊缝.

Weld appearance and stability of pulsed MIG welding process of aluminum alloy mainly depend on the stability of arc length.In order to obtain the stable welding process and high quality weld bead,the influence of pulsed current parameters on the stability of arc length was studied by welding experiments.The dynamical mathematical model between pulsed current parameters and arc length was established.Meanwhile,the dynamical response of arc length was simulated by varying dutyratio and frequency of pulsed current based on Matlab / Simulink software.At last,the welding experiments were carried out when the duty-ratio and frequency of pulsed current were changed,respectively.The result shows that the established model can reflect the variation of pulsed MIG welding process very well,and the stable welding process can be obtained through changing duty-ratio and frequency of pulsed current,and the sound weld shape was obtained.