Abstract: Introduce the overview of the steel shell tower project of the Shiziyang Bridge. Based on the structural characteristics of the Shiziyang steel shell tower, such as large component size, thin plate thickness, dense welding seams, and narrow working space, a welding process experiment was conducted to develop a large-scale robot welding process solution. The robot welding process for plate unit welding, segment assembly welding, and bridge position welding was studied and developed. Measures were taken to control welding deformation, improve welding efficiency, ensure welding quality, and lay a technical foundation for the formal welding production of the project.