二氧化碳短路过渡焊电流波形控制模式的研究

针对二氧化碳弧焊熔滴短路过渡过程动特性差，飞溅大的特点，对一种关联式电流波形智能控制器的波控模式进行了研究，提出了实时控制熔滴过渡过程电流波形的波控基本模式。试验表明，该波控模式能对弧焊过程实施有效波控，尤其适宜于带有交流纹波成分的整流焊接电源的波控。采用该控制模式，通过波控器的快速分流作用，可抑制弧焊短路初期，短路未期的电流增长和燃弧初期的电弧冲击，能够优化熔滴过渡过程的电流波形，使液桥柔顺破断，熔滴无冲击地进入熔池，从而改善了二氧化碳在弧焊过程中的动特性，抑制了焊接飞溅。

Control Pattern of Current Waveform on Droplet Short-Circuiting Transfer in Carbon Dioxide Arc Welding

In order to improve the dynamic performance of the carbon dioxide arc welding and reduce spattering, a basic pattern of the real-time current waveform control is put forward. The testing results show that the waveform control pattern can be used to control the current waveform of arc welding process effectively and is especially suited for the rectification welding power with alternating current carrier wave. By this pattern and the quick dived-flow of the waveform controller, the peak current can be restrained and the liquor-bridge can be softly broken and the droplet get into the molten pool unimpactly. The spatting in the beginning instant of the short-circuiting and the impact of the arc to the molten pool in the instant of the arc re-triggering can be weakened. In result, the waveform of the welding current is optimized, the dynamic performance of the welding process is improved and the spatting is restrained effectively.