CO_2气体保护药芯焊丝双丝焊接电信号稳定性分析

Stability Analysis of Electrical Signal in CO_2 Flux-Cored Double Wire GMAW

为进一步了解CO2气体保护药芯焊丝双丝焊接过程中电弧的稳定性和避免双丝焊接过程中产生的有规律的断弧现象,设计了不同焊接参数值(电压匹配、电流匹配、焊丝间距)的系列实验,采用高速摄像系统同步拍摄了电弧形态,采用Labview信号采集系统同步采集了焊接过程中两电弧的电流、电压波形.采用电流直方图对两电弧稳定性进行了对比分析.结果表明:对于引导电弧,降低跟随电弧电压,降低跟随电弧与引导电弧的电流比例,增大焊丝间距,电弧稳定性得以提高;对于跟随电弧,降低引导电弧与跟随电弧的电流比例,降低跟随电弧电弧电压,增大电弧间距,跟随电弧中断频率降低.最后,将高速摄影拍摄到的电弧图片与采集到的电流、电压波形图相结合,说明了发生断弧现象的循环规律.

In order to get a further understanding of the arc stability and study the regular phenomenon of arc interruption during the CO_2flux-cored double wire GMAW process,a series of experiments（arc voltage matching,welding current matching and inter-wire distance matching） were designed.Synchronous high-speed camera system was used to take a picture of arc shape and data acquisition system based on Labview was used to collect current and voltage waveforms simultaneously. Then histogram was used to analyze the arc stability.The results show that decreasing the voltage of trailing arc,decreasing the current ratio between trailing arc and leading arc and increasing the inter-wire distance will enhance the leading arc stability;decreasing the current ratio between leading arc and trailing arc,decreasing the voltage of trailing arc and increasing the inter-wire distance will decrease the frequency of interruption of the trailing arc.Finally,the captured images of the arc were combined with the acquisition of current,voltage waveforms,by which the arc interruption phenomenon occurred in the welding process was analyzed.