Production range of LSAW steel pipe

LSAW (Longitudinal Submerged Arc Welding) steel pipes are manufactured using two primary welding methods: double-sided submerged arc welding (DSAW) and high-frequency welding (HFW). The choice of welding method significantly affects the possible diameter and wall thickness of the steel pipe produced.

High-Frequency Welding (HFW)

Limitations: HFW typically accommodates steel pipe wall thicknesses of up to 12mm. This limitation is due to the inherent performance characteristics of high-frequency welding, which cannot effectively melt and weld thicker materials.

Production Range: This method is generally used for producing pipes with thinner walls and smaller diameters.

Double-Sided Submerged Arc Welding (DSAW)

Capabilities: Unlike HFW, DSAW is not restricted by the size of the steel pipe. It can handle much larger diameters and greater wall thicknesses.

Types of DSAW Pipes:

Butt Welded Pipe: Produced using a roll tube machine, resulting in shorter pipe sections (1.5m to 2.5m in length) which are then welded together to achieve the desired length.

Seam Welded Pipe: Made from large steel plates formed by a large hydraulic press. These pipes can be as long as the steel plate allows, with a maximum length of up to 14 meters. After forming, they are welded and calibrated for roundness.

Stealth Welded Pipe: Typically produced using high-frequency welding for diameters below 402mm and wall thicknesses of less than 12mm. The pipe is then expanded to reach the required size.

Large Diameter Straight Seam Submerged Arc Welded Pipe: Produced using U-hydraulic molding and double-sided submerged arc welding. These pipes can have a maximum diameter of 1420mm and a wall thickness of up to 80mm.

By leveraging these different welding methods, manufacturers can produce a wide range of LSAW steel pipes, each suited to various applications based on their specific size and structural requirements.