Abstract: definition，non-standardized weld specifications，complex process design，disjointed workflow coordination，and inefficient data transmission. This paper develops a model-based welding design and weld information management system for hull structures on the 3D EXPERIENCE platform. Starting from the detailed hull design model and driven by full-process welding data flow，the system uses secondary development to streamline data transmission across hull production design, weld modeling，welding process design， weld quantity statistics，and post-processing for hull component manufacturing，thereby enabling rapid welding design and efficient management based on a single data source. Applied and verified in practical shipbuilding projects，the system effectively eliminates data silos and integrates the entire workflow of hull welding design，providing a feasible solution for the digital and intelligent transformation of hull structure welding.