Four types of tools were used to weld 3mm 6082-T6 aluminum alloy thought stationary shoulder friction stir welding. The macro morphology, microstructure, mechanical properties and fracture morphology of welded joints by tools of different shapes, as well as the heat generation of the tools were studied. The results show that the triangle tool and the quadrangle tool produce lower heat and have a relatively large dynamic and static volume, which can enhance the flow of plastic metal at the joint, reduce the small temperature difference between the top and bottom of the weld during the welding process, and form a defect-free SSFSW joint. XRD analysis shows that no new phases are generated during the welding process, and the crystallites size of NZ welded by triangle tool is the smallest. The hardness of each joint is distributed in a "U" shape, and the lowest point is at the junction of RS-TMAZ and NZ, but the hardness of the welded joint by triangle tool is slightly higher. The tensile strength and elongation after fracture of the welded joint by triangle tool are the highest, respectively 202.9MPa and 3.8%. Analysis of tensile fracture morphology shows that all joints are ductile fractures.