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进行了电源主电路各部分压降的理论分析和试验 ,确定了 2 8V超低空载电压 .在讨论了GTAW接触引弧过程的信号特征和弧源系统动态稳定判据的基础上 ,设计了特征信号快速采集和逻辑判断系统 ,通过工作在模拟区域 IGBT管的快速信号传递特性实现电源外特性的切换 ,并研制成功了适应薄板小电流焊接电源 .在进一步分析了接触引弧过程电参数曲线的基础上 ,提出了接触引弧过程中微弧段与建弧段的概念 ,指出微弧段的建立是接触引弧成功的关键 .
The theoretical analysis and experiment on the voltage drop of each part of the main circuit of the power supply were carried out and the ultra-low no-load voltage of 2 8V was determined.On the basis of discussing the signal characteristics and the dynamic stability criterion of the arc source system during the GTAW contact arc starting process, Rapid acquisition and logic judgment system of characteristic signal to realize the switching of the characteristics of external power supply through the fast signal transfer characteristic of the IGBT in the simulated area and the successful development of the welding machine adapted to the small current welding of the thin plate.Analyzed the curve of the electrical parameters during the contact arc process , The concept of micro-arc and arc-building is proposed in the process of contact arc ignition. It is pointed out that the establishment of micro-arc is the key to the success of arc ignition.