1.The raw materials are steel coil, sire and flux. A severe physical and chemical inspection should be carried out before the input.
2.The head and tail joint of the Spiral Steel Pipe, the single wire or double wire submerged arc welding is selected, the active submerged arc welding is used after the rolling of the steel tube.
3.Before forming, the strip is leveled, trimming and flanging, the surface is arranged and transported to the curved edge.
4.Use external or internal control roll forming.
5.The weld gap control device is selected to ensure satisfactory welding requirements for the weld gap, and the spiral steel pipe diameter, wrong edge are strictly controlled.
6.Stable welding quality can be obtained.
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