Welding process of spiral steel pipe

1) Raw materials: strip coil, welding wire, flux. They must pass strict physical and chemical inspection before they are put into operation.

2) Strip steel butt, choose single wire or double wire submerged arc welding, choose active submerged arc welding after rolling into steel pipe repair welding.

3) Before forming, the strip steel is straightened, trimmed, planed, transported and treated with curved edges.

4) The electric contact pressure gauge is used to control the pressure of the cylinder on both sides of the conveyor to ensure the smooth transportation of the strip steel.

5) Choose external control or internal control roll forming.

6) The weld gap control device is selected to ensure that the weld gap is satisfied with the welding demand, and the pipe diameter, the amount of wrong side and the weld gap are strictly controlled.

7) Both internal welding and external welding are made of American Lincoln welding machine for single wire or double wire submerged arc welding, and then stable welding quality is obtained.