Presently, the most common construction practice for reinforcing rebar work in cast-in-place concrete bridge towers is off-site unit processing and on-site manual tying. However, the traditional model of on-site manual rebar tying during concrete bridge tower construction has become impractical in the face of rising labor costs, a shortage of skilled technical labor, and strong demands for high-quality development, failing to meet the needs of industrialized construction. The technology of prefabricated welded rebar part assembly, characterized by its modularity, factory production, and constructability, is increasingly applied in the construction of large-volume concrete bridge towers. Nevertheless, research regarding prefabricated rebar part construction still has significant shortages, including concerns over the strength and stability of the parts during storage, structural issues during hoisting such as tensile yielding of rebars and failure at weld points, and the necessity to control deformation of the rebar parts during hoisting. Additionally, experimental research on stiffness at weld points is currently very limited. This paper proposes a method that employs multiple regression techniques to predict weld point stiffness for a broader range of main and stirrup rebar diameters, based on limited existing experimental data. Subsequently, the study employs the finite element method to analyze the largest welded rebar part of the Guanyinsi Yangtze River Bridge, accounting for stiffness at the weld points. This assessment calculates the deformation and stress distribution within the rebar part during storage and hoisting, identifying areas with significant stress concentrations. In addition, this article compares the effects of two different lifting schemes, sparse rope lifting and dense rope lifting, on the steel reinforcement components. The results of this study aim to provide a theoretical basis and practical experience for the construction control of welded rebar parts in concrete bridge tower structures.