Abstract: A new one-cycle-control method of pulsed MIG arc welding system is designed. With nonlinear control method and real-time arc voltage acquisition, this method controls the average voltage in each cycle and makes it equal to the pre-set reference signal. The control system possesses excellent dynamic response. When disturbance happens, in every cycle, there is neither static error nor dynamic error between average arc voltage and pre-set reference signal. The arc length will be adjusted to stable status in several cycles. The experiment result indicates that the designed control system possesses excellent are self-adjustment property and welding procedure characteristic.

Key words: Nonlinear control, One cycle, Pulsed MIG