1: Conduct physical and chemical inspections on raw materials such as strip coils, welding wires, and fluxes.
2: The head and tail of the strip are butt-jointed using single-wire or double-wire submerged arc welding. After being rolled into a steel pipe, automatic submerged arc welding is used for repair welding.
3: Before forming, the strip steel is leveled, trimmed, planed, surface cleaned, transported, and pre-bent.
4: Use electric contact pressure gauges to control the pressure of the cylinders on both sides of the conveyor to ensure smooth transportation of the strip.
5: Adopt external control or internal control roller forming.
6: The weld gap control device is used to ensure that the weld gap meets the welding requirements. The steel pipe diameter, offset amount, and weld gap are strictly controlled.
7: Both internal and external welding use electric welding machines for single-wire or double-wire submerged arc welding to obtain stable welding quality.