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Manufacturing process of spiral steel pipe (SSAW):
The raw materials are strip steel coils, welding wire, and flux. They must undergo strict physical and chemical inspections before being put into use.
The head and tail of the strip steel are connected by single or double line submerged arc welding, and after being rolled into steel pipes, automatic submerged arc welding is used for repair welding.
Before forming, the strip undergoes leveling, trimming, planing, surface cleaning, conveying, and pre bending.
Electric contact pressure gauge is used to control the pressure of the cylinders on both sides of the conveyor to ensure smooth conveying of the strip.
Adopting external or internal control roll forming.
The weld seam gap control device is used to ensure that the weld seam gap meets the welding requirements, strictly controlling the pipe diameter, misalignment, and weld seam gap.
Both internal and external welding are carried out using American Lincoln welding machines for single or double line submerged arc welding to obtain stable welding specifications.
All welds are inspected by an online continuous ultrasonic automatic flaw detector to ensure a non-destructive testing coverage rate of 100% for spiral welds. If there is a defect, it will automatically sound an alarm and spray a mark, and production workers can adjust the process parameters accordingly at any time to eliminate the defect in a timely manner.
Use an air plasma cutting machine to cut steel pipes into individual pieces.
After each batch of steel pipes is cut into individual steel pipes, it must undergo a strict first inspection system to check the mechanical properties, chemical composition, fusion condition, surface quality of the steel pipes, and non-destructive testing of the welds, ensuring that the pipe manufacturing process is qualified. Only in this way can it be officially put into production.
Parts with continuous ultrasonic testing marks on the weld seam should be re inspected using manual ultrasonic and X-ray methods. If there are indeed defects, they should be repaired and non-destructive testing should be carried out again until it is confirmed that the defects have been eliminated.
The pipe where the strip butt weld and the T-shaped joint intersecting with the spiral weld are located should be inspected by X-ray television or photography.
Each steel pipe undergoes hydrostatic pressure testing, and the pressure is radially sealed. The test pressure and time are strictly controlled by the steel pipe water pressure microcomputer detection device. The test parameters will be automatically printed and recorded.
The pipe end is machined to precisely control the perpendicularity, bevel angle, and blunt edge of the end face.
ADD：Chengnan Industrial Development Zone, Yanshan County, Hebei Province
Domestic phone number：0086-317-6689999
International call：0086-317-6165555
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