Study on self-shielded flux cored automatic welding of large diameter pipes

In order to improve the welding efficiency at low construction cost,a self-shielded flux cored automatic welding without droughtproofing device at the less than 8 m/s of wind speed was proposed,which combined the advantages of self-shielded flux cored semi-automatic welding and solid gas-shielded automatic welding. The system mainly includes the welding vehicle,welding track,swing mechanism and control system. The experimental results show that the welding quality is good and the mechanical properties of the weld have met the current pipeline construction standard. After repeated testing,the performances of all position automatic welding equipment with self-shielded flux cored welding satisfy the design requirements,and meet the construction standard of welding in site for large diameter pipes.