Circumferential seam automatic welding machine is able to complete a variety of circular, annular weld universal automatic Welding Alloys. Can be used for high-quality welding of carbon steel, low alloy steel, stainless steel, aluminum and its alloys and other materials, can choose argon arc welding (fill in the wire, with or without filler wire), MIG welding, plasma welding and the welding power source composed of a set of girth Cast Iron Welding Electrode. Can be widely used in hydraulic cylinders, automobile steering rack, drive shaft, pump storage, chemical and medical containers, gas tank, fire-fighting equipment, mining and the production line cylinders and liquid storage tube products welding.