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The Friction Stir Welding (FSW) process is commonly used for joining aluminum sheets. The FSW process occurs due to temperature and the force of emphasis on the connection. heat Energy is generated from the deformation of material and friction between the tool and the material. The FSW process generally emphasizes the generation of heat energy from the deformation process of material. This research studies the FSW process which prioritizes the friction between tool and material, as a heat energy generator. Research of Friction Stir Spot Welding uses aluminum A1100 sheets with a thickness of 0.4 mm. Tool material are HSS, with shoulder diameter of 4 mm, the pin diameter 2 mm and length 0.6 mm. The joining process of Friction Stir Spot Welding used tool rotational speed of 33000 rpm. This research has proven that the main heat energy can be generated from friction, which results from high speed rotation of tool. The axial force and temperature distribution measured at several points location. Shear strength data and microstructures of welds indicate that this method is feasible to be applied in the FSSW process.