Research on laser-arc hybrid welding technology for long-distance pipeline construction

In recent years，the research on pipeline laser-arc hybrid welding technology has been the important and difficult in the field of welding all over the world．China Petroleum Pipeline Research Institute Co．Ltd．has firstly developed pipeline laser-arc hybrid welding system in China，and executed the welding tests based on X70/X80 steel．Preliminary experiment results showed that hybrid welding could meet the requirements of related standards such as API1104，ASME，etc．，the mechanical properties of girth seam are qualified in the case that there were no internal defects．With the development of high-power fiber laser and the continuous improvement of welding equipment，laser-arc hybrid welding technology for pipeline field welding will be available soon．