摘要
焊接薄板时,为减小热输入,减少焊件变形,控制短路过渡中的飞溅,研究配合推拉丝系统且以DSP(TMS320F2812)为控制核心的GMAW焊接电源系统,制定相应的波形控制方案.在波形控制方案中摒弃在短路初期降低电流的方法,采用驱动模块输出较小固定脉冲宽度的方案.焊接实验结果表明,设计的波形控制方案与推拉丝系统匹配良好,能实现低能量输入、飞溅较小的焊接.
In order to reduce the heat input and welding deformation,and control the welding spatter in the process of thin plates welding,the GMAW welding power supply system coupled with push-pull wire feeding system was studied and designed,where the digital signal processor(TMS320F2812)was taken as the control core.The corresponding waveform control scheme was designed.The method of reducing the current in early period of short-circuit was abandoned and an option of making the driving circuit output fixed pulse with smaller width was adopted.The welding experimental result showed that waveform control scheme designed could match with the push-pull wire feeding system precisely and welding with low energy input and little spatter was realized.
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