Spiral seam steel pipes generally have higher strength than straight seam welded pipes, and can produce welded pipes with larger diameters using narrower billets. They can also produce welded pipes with different diameters using billets of the same width. However, compared to straight seam pipes of the same length, the weld length increases by 30% and the production speed is lower. Therefore, smaller diameter welded pipes mostly use straight seam welding, while larger diameter welded pipes mostly use spiral welding.