The use of three-dimensional flexible welding platforms for welding processes is the primary production process in the sedan manufacturing industry. The use of welding fixtures directly affects the power, accuracy, and quality of the welding process. Among many car manufacturers in China, specialized welding fixtures are generally used for welding, and 3D welding platforms are equipped for one or several specific welding processes. With the current trend of small batch and personalized production of sedans, the use of such fixtures is increasingly restricted. The shortcomings of long planned production cycles, large space occupation, and low reuse rates are fully exposed. This situation greatly restricts the progress of welding technology in China's sedan manufacturing industry and prolongs the cycle of new car models. The five surfaces of the three-dimensional flexible welding platform are machined with spaced holes and engraved with mesh lines. The holes are through holes without inclination or threads. Any workpiece on the flexible welding platform can be positioned and clamped using fixtures and locking pins. Several flexible welding platforms can be directly connected together on any five surfaces for splicing purposes. This modular system demonstrates its universal functionality in equipment, adjustment, and clamping of workpieces. Its advantage lies in completing the application of large workpieces. And the flexibility of the flexible welding platform here does not refer to its flexibility, on the contrary, its raw material hardness is good, and it has strong resistance to impact and is still useful. Simply put, its flexibility here refers to its versatility and versatility. Flexibility of 3D welding platform: The flexible 3D combination welding plate has high load-bearing capacity and stable rigidity. Its five surfaces are processed with regular holes and engraved with mesh lines. The welding platform can be easily extended and expanded, combined. The expanded standardized tabletop can be directly connected together for modular positioning and clamping. The universal function of the flexible 3D platform welding fixture system is vividly demonstrated in the process of equipment, adjustment, and positioning of workpieces, not in the application of large workpieces. There are various assembly methods, and users only need to unleash their imagination. The 3D workbench can achieve the same positioning and clamping functions as various specialized fixtures. Quick assembly and easy disassembly; The three-dimensional flexible welding platform workbench can be assembled and combined according to the shape and size of the workpiece. The scale on the countertop and the planning of module specifications allow operators to quickly set up the required tooling according to the workpiece specifications without the need for measuring tools.