New development of welding technology for long-distance oilggas pipel ines

The new development of welding technology has been reviewed for long-di stance oilggas pipelines in the paper.Due to the rapidly growing requirement of high-pressure heave-wall pipeline installation,the mechanized GMAW process is ap plied widely.Nowadays,GMAW process with double sides formation by one-side weldi ng becomes the key technology for pipeline installation in the world.It indicate s that the welding speed can be obviously increased when Tandem GMAW is used.In the case of dual Tandem GMAW,the welding speed can be further increased,which lo wer the labor cost and the number of welding stations.