Double-model fuzzy logic control strategy of arc in pulsed metal inertia gas welding
脉冲MIG焊电弧双模模糊控制

According to the feature of arc control in welding steel using pulsed metal inertia gas(MIG) welding,a correction-factor-based double-model fuzzy logic controller(FLC) was developed to realize the stability of arc control by means of feedback of peak arc voltage.When the difference of peak arc voltage is high,a coarse adjusting fuzzy control rule with correction factor is designed,the peak arc voltage is controlled by the wire feeding speed by means of feedback of peak arc voltage.When the difference of peak arc voltage is small,a fine adjusting fuzzy control rule with correction factor is designed,the peak arc voltage is controlled by the pulse base time by means of feedback of arc voltage.The FLC is realized in a Look-Up-Table(LUT) method.An experiment has been carried out,aiming at implementing the control strategy to control the arc length change in welding process.The experiment result shows that the proposed controller enables the stability of arc and welding process to be achieved in pulsed MIG welding process.