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本文详细讨论了低频脉冲MAG焊焊缝熔透质量闭环控制的必要性及实现方法,并成功地研制出了一种闭环控制系统。该系统是通过在焊缝背面的下方放置的熔透传感器(由光电三级管构成)测量与熔池尺寸有关系的热辐射能量,并把所测得的信号经控制回路处理后去触发脉冲波形,再经送丝驱动回路放大后控制送丝速度也即焊接电流平均值,从而实现了焊缝熔透质量的闭环控制。
This paper discusses in detail the necessity and realization of closed-loop control of weld penetration in low-frequency pulsed MAG welds, and successfully develops a closed-loop control system. The system measures the thermal radiation energy related to the size of the weld pool by means of a penetration sensor (composed of a phototube) placed under the backside of the weld and the measured signal is de-energized by the control loop Waveform, and then sent through the wire drive loop amplification control wire feeding speed that is the average welding current, so as to achieve the quality of weld penetration closed-loop control.