Production range of longitudinal welded pipe

Longitudinal welded pipe on the form of welding is roughly divided into two types: the first is double-sided submerged arc welding, the second is high-frequency welding. But in between the two can make the diameter of the steel pipe is very different. Such as high-frequency welding of the pipe wall thickness of the general is not more than 12mm, this situation is caused by the performance of high-frequency welding, too thick welding machine can not melt the steel can be welded to shape. And double-sided submerged arc welding is different from it, it is not subject to the size of the steel pipe to be processed, diameter and thickness are far more than the size of high-frequency welding. Therefore, double-sided submerged arc welded pipe(dsaw steel pipe) is divided into butt welded pipe (also known as girth pipe) and a seam of the straight seam steel pipe, stealth seam steel pipe. 

The so-called butt weld pipe is produced by the roll tube machine (due to the impact of the machine bed, the general length of 1.5 m -2.5 m) between the shorter pipe, and then in a period of welding together, so that able to achieve the required length, called the butt welded steel pipe. A seam welded pipe is made of a large plate by a large hydraulic press molding (its length can be based on the length of the steel plate, the longest can be done 14 meters), and then in the welding, school circle. The stealth welded pipe, generally by the diameter of 402 below the wall thickness of 12mm or less, in the form of high-frequency welding made out, and then expanded through the expansion of the aperture has reached the required size, large diameter straight seam submerged arc welding steel pipe, through the u-hydraulic molding, double-sided submerged arc welding, the maximum diameter of 1420mm thickest 80mm.