Investigation on microprocessor based waveform control of short circuit transfer CO_2 welding

摘要

A new kind of simple and flexible CO_2 welding system was developed to carry out waveform control. The system consisted of IGBT inverter, PWM circuit and microprocessor unit (MPU), in which the output current of constant current (CC) power supply could be changed according to transient physical state, and the variable down slope rate control could be used to ensure a stable welding process. The welding experiment results proved the effectiveness of this control approach.