小电流稳定性对微束等离子弧焊工艺至关重要,微束等离子孤焊一个显著的特点是小电流焊接,焊接电流可以达到0.05 A.当在小电流下焊接时,保持电孤稳定燃烧,对微束等离子弧焊电源提出了很高的要求.微束等离子弧焊的电源特性直接关系到微束等离子弧焊焊接工艺的好坏.针对晶体管微束等离子电源,采用Saber软件进行了仿真研究.内容包括微束等离子弧焊电源的主电路和反馈控制电路模型的建立,对晶体管微束等离子弧焊电源的电源特性(主电路开环特性、电源系统闭环控制特性),仿真分析了电源输出纹波等,探讨了电源小电流输出稳定性.%The stability of welding in low current is the most important factor in micro-plasma arc welding technology. Welding in low current is one of the most notable feathers of micro-plasma arc welding. It still can weld when the current is as low as 0.05A. Maintaining a stable welding arc when welding in low current requires a high level welding power source. The characteristics of micro-plasma arc welding power source directly influence the quality of welding technology. Micro-plasma arc welding power source controlled with transistor has been simulated and studied with saber software in this paper. The main power circuit and feedback controller of micro-plasma arc welding power source have been modeled, meanwhile the power source's characteristics including the main circuit' Open-loop characteristics,the Closed-loop characteristics of the power source and the ripple, in the output current have been simulated and analyzed. A preliminary discussion on the stability of the power with low current has been made in this paper.
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