Research on Automatic Welding Procedure of Large-Diameter Long-Distance Pipeline

Taking CRC automatic welding technology used in Central-Asia Natural-Gas pipeline C line engineering as the research object,the pipeline steel was welded under the selected welding technical parameters,and mechanical properties and macro-microstructure of the joints were tested.The testing results show that the welding procedure is appropriate,and the joint's performance can meet the requirements of standard API 1104—2005.Finally,the technical points of the CRC field welding and the economic benefits were analyzed.This technology is currently being applied to the Central-Asia Natural-Gas pipeline C line engineering and has got good welding quality.