This paper describes the basic principle, the composition of control circuit and the construction of control software of intelligent controller for the robotics arc welding inverter and equipment. The experimental results show that the MOSFET arc welding inverter power source can be directly numerical controlled by 8097BH single- chip microcomputer, static and dynamic characteristics and welding sequences for CO2/MAG automatic welding can be conveniently achieved, faults can be detected in the welding process and alarming can be realized, welding parameters can be changed, adjusted, stored and recalled. Besides, the controller makes a complete welding system with the arc welding inverter, the wire feeder and the torch, and has only an on/off relationship with the robotics control cabinet. By changing PI parameters, the dynamic characteristic of inverter can be adjusted. This makes the welding process stabler, the spatter less, and the weld appearance better, and shows more advantages of robotics welding methods.
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