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 the large-diameter welded steel pipe is formed, the strip steel is leveled, trimmed, planed, surface cleaned, conveyed, 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: Adopt external control or internal control roll forming of large-diameter welded steel pipe.
6: The weld gap control device of large-diameter welded steel pipe is used to ensure that the weld gap meets the welding requirements and that the pipe diameter, misalignment amount, and weld gap are strictly controlled.
7: The internal welding and external welding of large-diameter welded steel pipes are performed by American Lincoln welding machines for single-wire or double-wire submerged arc welding, to obtain stable welding quality.
Post time: Dec-26-2022