Both straight seam steel pipe and spiral steel pipe are types of welded steel pipe, but straight seam pipe is welded using high-frequency welding and submerged arc welding, while spiral pipe is welded using submerged arc welding. These pipes are widely used in national production and construction.

Welded steel pipe and spiral steel pipe have many differences due to their different production processes.

The production process for straight seam welded pipe is relatively simple. The main production processes are high-frequency welding and submerged arc welding. Straight seam pipe boasts high production efficiency, low cost, and rapid development.

Spiral welded pipe is generally stronger than welded pipe. Its main production process is submerged arc welding. Spiral steel pipe can be produced from billets of the same width to produce pipes of different diameters, and can even produce larger diameter pipes from narrower billets. However, compared with straight seam pipes of the same length, the weld length increases by 30~100% and the production speed is lower. Therefore, smaller diameter welded pipes mostly use straight seam welding, while large diameter thick wall double-sided submerged arc welded straight seam steel pipes mostly use submerged arc welding.

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