In the two-stage production process of spiral pipe a continuous thick-wire large current high-speed welding method is used at the first process stage . And the performance of welding torch and the quality of welding technology directly affects the efficiency of steel pipe production .

在螺旋管预精焊法（二步法）生产中，预焊工序采用连续、粗丝、大电流的高速MAG焊方式， 焊枪的性能和焊接工艺的优劣直接影响到 钢管的生产效率。