Large-diameter welded steel pipe production process

Some of the customers will feel puzzled about the large-diameter welded steel pipe production processes. Here let me show the details of the welded steel pipe production. 

1: Conduct physical and chemical inspections of raw materials such as strip steel coils, welding wires, and fluxes.
2: The head-to-tail butt joint of the strip steel adopts single-wire or double-wire submerged arc welding, and automatic submerged arc welding is used for repair welding after being rolled into steel pipes.
3: Before forming, the strip is leveled, trimmed, planed, surface cleaned, transported, and pre-bent.
4: Use the electric contact pressure gauge to control the pressure of the oil cylinders on both sides of the conveyor to ensure the smooth conveying of the strip.
5: Use external control or internal control roll forming.
6: The weld gap control device is used to ensure that the weld gap meets the welding requirements and that the pipe diameter, misalignment, and weld gap are strictly controlled.
7: Both internal and external welding uses an American Lincoln welding machine for single-wire or double-wire submerged arc welding, to obtain stable welding quality.