Welded steel pipes can be divided into straight seam welded pipes and spiral welded pipes according to the weld forming process.

1. Longitudinal Welded Pipe

Features: The weld seam is a straight line parallel to the pipe axis.

Manufacturing Process: Steel plates or strips are gradually bent into a round tube shape through multiple forming rollers and then welded.

 Advantages: Relatively simple process and low production cost.

Sub-Types:

· ERW: High-Frequency Electric Resistance Welding - the most common type of longitudinally welded pipe, described in detail below.

· LSAW: Submerged Arc Welding - typically used for large-diameter, thick-walled pipe.

2. Spiral Welded Pipe

Features: The weld seam is spirally wound around the steel pipe body.

Manufacturing Process: Strip steel is continuously rolled and welded at a specific spiral angle (forming angle). Advantages:

Good pressure bearing capacity: The weld seam avoids the direction of principal stress, ensuring more uniform pressure distribution across the pipe body.

Flexible Specifications: Using the same strip width, pipes of varying diameters can be produced by adjusting the spiral angle.

Large Diameter: Very large diameter pipes can be produced.

Main Process: Submerged arc welding is typically used.

    Shandong Lituo Co., Ltd., deeply rooted in the steel industry, builds a solid foundation for quality! Our straight seam welded pipes offer exceptional value for money, while our spiral steel pipes offer excellent pressure and crack resistance. Our entire product line undergoes rigorous quality testing and boasts a proven track record of quality. If you have any purchasing needs, please contact us. We look forward to collaborating with you for a mutually beneficial partnership!

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