The spiral steel pipe used in TPEP anti-corrosion steel pipe is produced using double-sided submerged arc welding technology, with smooth and uniform welds. Through strict selection of welding flux, the strip steel is welded into shape through spiral welding. At the same time, spiral seam welded steel pipes generally need to be beveled after production and before passing inspection and leaving the factory. The purpose of beveling spiral welded steel pipes is to facilitate welding.