Large Diameter LSAW Steel Pipes

Submerged arc welding straight seam steel pipe is welded by automatic double wire double side Submerged arc welding process with strip steel coil or plate as raw material and often warm extrusion forming; The production process is simple, with high production efficiency, low cost, and rapid development.

The welding process of submerged arc welding straight seam steel pipe is submerged arc welding technology, which uses filler welding and particle shielded flux submerged arc welding.

The diameter of production can reach more than 1500mm. LSAW is the abbreviation of Submerged arc welding straight seam steel pipe. The production process of submerged arc welding straight seam steel pipe includes JCOE forming technology and roll forming submerged arc welding technology. When the diameter is large, two steel plates may be welded and used for rolling, which can form double welds.

The applicable standards for Submerged arc welding straight seam steel pipes are GB/T3091-2008 Low pressure fluid steel pipe production standard, GB/T9711.1-2-1997 Petroleum and gas steel pipe production and use standard, and API 5L pipeline steel pipe executive standard.

Large Diameter LSAW steel pipe Weld lines:

Below 1300mm is single weld line

1300-2056mm double weld line

2056-2820mm three weld line

1. High strength and can withstand huge axial loads, radial pressures and various complex stresses from the formation, which can meet the strict requirements for the strength of pipes in different engineering environments.

2. Have good toughness, so that it is not easy to have brittle fractures when subjected to impacts or vibrations, which increases the service life and reliability of the pipes and is suitable for some application scenarios with complex geological conditions and the existence of vibrations or impacts.

3. Submerged arc welding process uses welding wire as the filler for submerged arc welding and employs flux to protect the weld seams, forming continuous weld seams with high strength. The strength of the weld seams is comparable to that of the base metal, effectively ensuring the overall strength and tightness of the steel pipes.

4. Advanced forming and processing technologies are adopted in the manufacturing process, enabling the steel pipes to maintain good roundness even with large diameters. This is crucial for the installation, connection and subsequent use and maintenance of the pipelines.

5. Strict production processes and quality control have made the diameter tolerances of large-diameter longitudinal submerged arc welded steel pipes kept within a small range, and steel pipes of the same specification have a high degree of interchangeability.

6. The submerged arc welding has a fast welding speed and high production efficiency, which can meet the needs of large-scale production and reduce production costs.

7. Production process is mature and easy to realize automated and mechanized production. It is suitable for mass production, and the product quality is stable and reliable, which can effectively improve production efficiency and economic benefits.