填丝脉冲GTAW焊缝成形的单变量智能控制

针对填丝脉冲 GTAW过程的不同熔透状态 ,提出了焊缝正面和反面的成形控制问题。考虑到焊接过程的非线性特点 ,结合 PID控制器和神经元控制器的优点 ,设计了基于单个神经元的单变量自学习 PID控制器。在 2 m m厚的哑铃形 A3钢试件上进行对接闭环控制实验 ,试验结果表明 :在散热条件变化的条件下单独调节脉冲占空比可以保证焊缝反面宽度的稳定 ;单独调节送丝速度可以保证焊缝正面高度的稳定。

Single-variable intelligent control for bead shape of pulsed GTAW with wire filler

Aiming at the different penetration modes of pulsed GTAW with wire filler, the problems of controlling the topside and backside weld bead shape are proposed. For consideration of the non linearity of the welding process, a single variable self learning PID controller based on a neuron was developed with the combination of the merits of PID controller and neural controller. Closed loop control experiments with butt joint were conducted on 2 mm mild steel dumbbell shaped work piece. The experimental results indicate that the backside bead width or topside bead height could be stabilized by singly regulating pulse duty ratio or wire feed speed under the condition of varying heat sinking.