Spiral submerged arc welding pipe prefabrication technology

　　Pre-finishing technology is the large diameter welding thick-walled spiral pipe production of oil and gas pipelines in the more advanced technology.

　　The first step in the pre-bonding method using fine production of spiral welded pipe, which was followed by gas welding continuously welded steel strip on the molding machine, pre-weld tube consequent plasma cutting machine cut into a predetermined length of pipe the second step is a pre-welded steel pipe after finish welding production line delivery to internal and external multi-wire submerged arc welding fine.

　　Spiral welded pipe welding two-step pre-finishing production technology Yuan has obvious advantages compared with conventional one-step spiral welded pipe production due to pre-finish welding submerged arc welding speed constraints, the forming and welding separately, an effective solution to the forming and welding problems between mutual interference. full advantage of forming and welding their own characteristics, to achieve a combination of high-speed molding and multi-unit welding, making a molding production line can simultaneously a number of fine welding production line offers to be welded steel pipe, thereby greatly increasing the production efficiency. in addition, since steel forming and submerged arc welding fine separately, on both sides of the pre-weld pipe beveling relatively stable, easy to get high-quality welds.