One-knob self-optimizing fuzzy cotrol of CO2 arc welding process

A new one-knob self-optimizing fuzzy control system of CO2 arc welding is established based on the syntheitic performance evaluation of droplet transfer process.It includes two kinds of self-optimizing fuzzy controllers;the arc voltage controller and the current waveform controller,The fuzzy control principle and the key points of the control patterns are presented.Through on -line detecting,computing of characteristic parameters and one-knob self-optimizing adjusting.the characteristic parameters and welding variables can be adjusted to suitable ranges under the control of the arc voltage controller,Meanwhile the current waveform controller is active in the rear-time stage of the short-circuiting and the instant of re-triggering arc.The experiment results show that the control and its algorithm can improve the synthetic performance of arc welding process apparently.