Spiral welded pipe equipment manufacturer Spiral welded pipe production process description

Application and production process of spiral welded pipe equipment

(1) Raw materials, namely strip steel coils, welding wires and flux. Strict physical and chemical inspections should be carried out before input.

(2) Single-wire or double-wire submerged arc welding is used for the butt joint of strip steel heads and tails, and automatic submerged arc welding is used for repair welding after rolling into steel pipes.

(3) Before forming, the strip steel should be flattened, trimmed, planed, surface cleaned, transported and pre-bent.

(4) Electric contact pressure gauges are used to control the pressure of the pressure cylinders on both sides of the conveyor to ensure smooth conveying of the strip steel.

(5) External or internal control rolling forming is adopted.

(6) A weld gap control device is used to ensure that the weld gap meets the welding requirements, and the pipe diameter, misalignment and weld gap are strictly controlled.

(7) Both internal and external welding are performed by single-wire or double-wire submerged arc welding using American Lincoln electric welding machines, and the welding quality is stable.

(8) All welds are inspected by online continuous ultrasonic automatic flaw detectors to ensure that the spiral welds achieve a high non-destructive testing coverage rate. If there are defects, an automatic alarm and spray mark will be issued, and the production workers will adjust the process parameters at any time to eliminate the defects in a timely manner.

(9) Steel pipes are cut into single pieces by air plasma cutting machines.

(10) After each batch of steel pipes is cut into single steel pipes, a strict first inspection system should be implemented to inspect the mechanical properties, chemical composition, fusion state, surface quality and non-destructive testing of the steel pipes to ensure that the pipe making process is qualified before it can be officially put into production.

(11) Parts with continuous ultrasonic flaw detection marks on the welds should be re-inspected by manual ultrasonic and X-ray. If there are defects, non-destructive testing should be carried out again after repair until it is confirmed that the defects have been eliminated.

(12) Pipes with spiral welds intersecting with steel butt welds and T-joints should be inspected by X-ray television or film.

(13) Each steel pipe is subjected to a water pressure test, and the pressure is radially sealed. The test pressure and time are strictly controlled by a steel pipe water pressure microcomputer detection device. The test parameters are automatically printed and recorded.

(14) The pipe ends are machined to control the verticality, inclination angle and blunt edge of the end face.