Process characteristics of spiral steel pipe

Posted by chase Liu on December 12th, 2022

Spiral steel pipe(SSAW) is a welded tube made of strip steel coil as raw material, extruded at regular temperature, and welded by automatic double-wire double-sided submerged arc welding process. Spiral steel pipe is mainly used in water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, and urban construction. It is one of the twenty key products developed by our country.

Used for liquid transportation: water supply and drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural purposes: as piling pipes, as bridges; pipes for wharves, roads, building structures, etc.

Main process characteristics of spiral steel pipe:

1. During the forming process, the deformation of the steel plate is uniform, the residual stress is small, and the surface does not produce scratches. The processed spiral steel pipe has greater flexibility in the size and specification range of diameter and wall thickness, especially in the production of high-grade thick-walled pipes. Especially in small and medium-diameter thick-walled pipes, it has incomparable advantages over other processes, and can meet more requirements of users in terms of specifications of spiral steel pipes.

2. Using advanced double-sided submerged arc welding technology, welding can be realized at the best position, and it is not easy to have defects such as misalignment, welding deviation and incomplete penetration, and it is easy to control the welding quality.

3. Carry out 100% quality inspection of steel pipes, so that the whole process of steel pipe production is under effective inspection and monitoring, effectively ensuring product quality.

4. All the equipment of the entire production line has the function of networking with the computer data acquisition system to realize real-time data transmission, and the technical parameters in the production process are checked by the central control room.

5. The raw materials are strip steel coil, welding wire and flux. Before putting into use, they must go through strict physical and chemical tests.

6. The head-to-tail butt joint of 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.

7. Before forming, the strip steel is leveled, edge trimmed, planed, surface cleaned, transported and pre-bent.

8. The electric contact pressure gauge is used to control the pressure of the cylinder on both sides of the conveyor to ensure the smooth conveying of the strip.

9. Adopt external control or internal control roll forming.

10. The weld gap control device is used to ensure that the weld gap meets the welding requirements, and the pipe diameter, misalignment amount and weld gap are strictly controlled.

11. Both internal welding and external welding use American Lincoln welding machine for single-wire or double-wire submerged arc welding, so as to obtain stable welding quality.