High-frequency straight seam welded steel pipe and submerged arc welded steel pipe is a straight seam steel pipe, its name comes from the weld form. Straight seam steel pipe is the steel pipe and pipe parallel to the vertical. Usually divided into metric welded steel pipe, welded thin-walled tube, transformer cooling tubing and so on. Straight seam welded pipe production process is simple, high production efficiency, low cost, the development of faster. The strength of the spiral welded pipe is generally higher than that of the straight seam welded pipe, and the pipe with larger diameter can be produced with the narrow billet. The same width of the blank can also produce different pipe diameter. However, compared with the same length of the straight pipe, the weld length increased by 30 to 100%, and the production rate is low.

High-frequency straight seam welded steel pipe and submerged arc welded seam steel pipe is the difference between the welding method of welding, submerged arc welding current welding through the wire flux and the surface of the steel pipe welding fusion. While the high-frequency welding process for the current through the steel pipe weld itself to weld.