In view of various defects existing in manual welding of flanges used in steel-lined UHMW-PE pipes(UHMWPE Mining pipe、UHMWPE Dredge Pipe、UHMWPE Roller Pipe), our company has gradually replaced manual welding with automatic flat welding flange welding machine, and the welding sequence adopts "carbon dioxide gas shielding" or mixed welding technology. The welding machine is fully capable of guaranteeing welding quality, ensuring no leakage of slurry and no environmental pollution in the process of pipeline use. For the weakest link (the easiest leak slurry) of the UHMW-PE high pressure pipe, which is located between the steel pipe and the welding flanges, our company in the whole process according to the national standard welding technology implementation, using domestic advanced flat welding flange fast alignment machine, to achieve the fast formation and spot welding of the steel pipe and protruding belt diameter flat welding flange, which improves the eff…