Hollow welded sphere is a hollow sphere formed by welding two hemispheres together. It can be used without ribs or with ribs according to the force applied. In China, welded hollow sphere nodes are suitable for node systems with single-layer or multi-layer spatial grid structures. This system is directly welded between steel pipes and prefabricated hollow spheres, and is suitable for connecting steel pipe members. The advantages of welding hollow ball joints are simple construction, clear force distribution, convenient connection, and much higher stiffness than bolted ball joints. Therefore, it has a wider range of applications than bolted ball joints. However, the on-site welding workload of welding hollow ball joints is relatively large, and the diameter of the ball is much larger than the pipe diameter, which becomes a disadvantage in construction.