Tack and final welding production line effectively integrates high-speed tack welding and low-speed final welding. The tack welding greatly improves production efficiency with maximum speed up to 10m/min, redlizes stress-free welding, effectively eliminates mutual interference between pipe forming and welding, and improves weld seam quality. The final welding realizes one-button automatic operation, effectively controls weld seam reinforcement and appearance with highly intelligent digital welding power source, and improves pipe traceability with automatic record of welding parameters.Since the commencement of production, the tack and final welding production line has provided SAWH pipes for many significant pipeline projects both at home and abroad, such as Myanmar-China Crude Oil Pipeline Project(China Section), Third West-East Gas Pipeline Project(West Section).Dongyinggang Co.,Ltd Pipeline Project, Shanxi Gas Industry Group Co.,Ltd. Pipeline Project,Myanmar-China Natural Gas Pipeling Project (China Section). Gentral Asia Gas Pipeline Line C Project (Uzbekistan Section), Venezuela pipeline, Pakistan Gas pipeline project,etc.