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建立了以电流和等离子气流为控制变量的等离子小孔焊接熔透闭环控制系统,采用小波方法从焊接电弧电压信号中实时、准确地提取熔池穿孔信息,通过对2个参量的协调控制,成功地实现了“一脉一孔”的焊接工艺。实验表明,该系统不仅显著地提高了电弧穿透力,能够有效地对10mm厚不锈钢进行小孔型焊接,而且具有良好的快速响应性能,成功克服了3～6mm厚度渐变及阶跃变化带来的扰动,实现连续、稳定、可靠的较厚板穿孔焊接。
A plasma closed-loop control system of plasma welding with plasma and plasma current was established. Wavelet method was used to extract the information of molten pool perforation in real time and accurately from the welding arc voltage signal. Through the coordinated control of the two parameters, To achieve a “pulse of a hole” of the welding process. Experiments show that the system not only significantly increases the arc penetration force, but also can effectively weld small holes of 10mm thick stainless steel with good fast response performance, successfully overcomes the 3 ~ 6mm thickness gradients and step changes Of the disturbance, to achieve continuous, stable and reliable thick plate perforated welding.