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介绍了多功能IGBT逆变式弧焊机控制电路的设计思想和硬件结构，重点分析了TIG焊恒流内拐式外特性、SMAW焊恒流阶梯外拖式外特性、脉冲焊接电流、程序控制电路的工作原理。
The design thought and hardware structure of the control circuit of multi-functional IGBT inverter arc welding machine are introduced. The external characteristics of constant current internal arc, the external characteristics of SMAW constant current external ladder, the pulse welding current, the program control The working principle of the circuit.