并联双闭环控制方式对GMAW焊接过程的影响

The Effect of Parallel Double Closed-Loop Control Method on GMAW Welding Process

在对短路过渡熔化极气体保护焊(GMAW)的飞溅及焊缝成形影响因素分析的基础上,基于数字信号处理器控制系统建立了一个全数字式并联双闭环控制系统,分别对短路阶段及燃弧阶段的焊接电参数进行调节,达到对短路、燃弧期间电流波形的分阶段适应性控制,以改善短路过渡GMAW工艺性能的目的.实验结果表明,采用该方式控制的波控数字式GMAW焊接电源,在焊接性能上与普通平特性逆变焊接电源相比有较大的提高,飞溅减小、焊接过程稳定、焊缝成形好,更加适合GMAW短路过渡焊.

Based on the analysis of influencing factor of gas metal arc welding（GMAW） characteristic, a DSP（digital signal process） based whole digital parallel double closed-loop control system was established to adjust the electrical parameter during the “short” phase and “arc” phase separately, in order to improve GMAW welding characteristic by modulating the current waveform of short time and arc time. The experimental result shows that by this digital waveform control GMAW power source, the welding characteristic can be improved greatly compared with that by constant voltage power source, such as reducing the spatter, weld bead formed and the stability of welding process. It is fit for GMAW short-circuit welding more.