管道全位置焊接参数控制系统

Parameters control system for all-position welding of pipeline

众多焊接参数的合理匹配和有效控制是管道环缝全位置焊接过程自动化的难题之一。结合路径示教、参数匹配及参数控制等技术,建立了管道环缝全位置焊接过程自动控制系统,并介绍了其工作原理、系统构成和软件设计。该系统能根据焊接位置自动匹配焊接电流、电弧电压、焊接速度以及焊炬摆动的速度和幅度等参数,并通过调节送丝速度实现了焊接电流的PID控制,通过调整焊炬高度实现了电弧长度的模糊控制。该系统还具有离线编程、路径示教和记忆跟踪等功能。将该系统用于非旋转管道环缝全位置焊接过程,实现了打底、填充和盖面焊接的自动控制。结果表明,实际焊接参数与预设值吻合良好,焊缝成形稳定。

Reasonable matching and effective control of various welding parameters is one of the problems in the automation of all-position welding process for circular seam of pipeline. Integrating the techniques of path teaching, parameters matching and parameters control, the automatic control system of all-position welding process for circular seam of pipeline is developed. The working principle, system structure and software design are also introduced. According to the welding position, the system can automatically assign the welding parameters, such as welding current, arc voltage, welding speed, torch swing speed and width. By adjusting wire feed rate and the torch height, the PID control of welding current and fuzzy control of arc length are realized. This system has also the functions of off-line programming, path teaching and remembering weld tracking. Applying this system to all-position welding process for circular seam of pipeline, the automatic control of root weld, filled weld arid cover weld are realized. Experiments show that the practical value of welding parameters fit the preset value very well and the weld formation is satisfied.