This paper discusses characteristic and inland development of Mic-plasam welding,recounts the function of new PWM chip-SG3525,and introduces the application of SG3525 in designing mic-plasam welding.

• 论述微束等离子弧焊接电源的特点以及在国内的发展情况,介绍新型PWM芯片SG3525引脚功能及其在微束等离子弧焊接电源设计中的应用。