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On March 2, it was learned from Sinopec Fourth Construction Co., Ltd. (abbreviated as Sinopec Fourth Construction) that the \"Automatic Welding Technology for Longitudinal Seams of Inner Vessels in Sinopec LNG Storage Tanks,\" developed under the leadership of this company, won the third prize for scientific and technological progress at Sinopec. Under the unified organization of the Engineering Department of Sinopec Group, and with Sinopec Fourth Construction Company taking the lead, together with Sinopec United Natural Gas Branch and Sinopec Engineering Construction Company (SEI), the project \"Development of Automatic Welding Process for the Longitudinal Seams of the Inner Vessel of Sinopec LNG Storage Tanks\" was initiated. The application of this technology enables the fully automatic welding of the welds on the wall of the inner vessel of LNG storage tanks, placing Sinopec’s technology for constructing large-scale LNG storage tanks at the forefront among domestic competitors. Taking into account the structural characteristics of the longitudinal seams in LNG storage tanks as well as the properties of 9%Ni steel, the project development team developed a U-shaped narrow-bevel welding process. This enabled the first automated welding process in China for the root pass, fill pass, and cap pass of all longitudinal seams in LNG storage tanks; it reduced the amount of weld metal required, resulted in aesthetically pleasing weld shapes, improved mechanical properties, and ensured reliable quality. This process improves welding production efficiency and reduces construction costs; at the same time, it reduces dust, fumes, and noise in the space inside the tank, thereby greatly improving the working environment and achieving environmental sustainability. The automatic welding technology for the longitudinal seams of the inner tank in LNG storage tanks was used for the first time in the second phase of the Tianjin LNG receiving station project, and was subsequently adopted in the Sinopec Longkou LNG receiving station project. This approach improves construction efficiency while also ensuring better welding quality.