【摘要】 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 .更多还原

【Abstract】 The theoretic analyses of voltage drops for all parts of the power source main circuit and lots of experiments were carried out, and a very low no load voltage (28 V) was determined. By discussing the signals features of the GTAW touch igniting and the arc power dynamic stabilization criterion, a system for quickly capturing the electronic signals and deciding logic state was designed. The power source output voltage and current characteristics are switched through the IGBT, which works in analogous area and has very high speed signals transmission features. A welding power source used for thin plate welding with low current was produced. Furthermore, according to the analysis of the waves of electronic signals of touch igniting, which are recorded through arc dynamic test system the concepts of micro arc section and build up arc section were put forward, and it was pointed out that the micro arc section is the crucial state of successful touch igniting.更多还原