Modelos para forças de soldagem por atrito-mistura (FSW) com ferramenta de perfil quadrado

Abstract

Friction Stir Welding (FSW) is a widely used solid state joining process, which is subjected to large forces. FSW tools with square pin profile are known to produce defect free welds; however, no force models are available for this tool geometry. In this paper, FSW force models are developed using different methodologies, presented in two parts, namely: welding and transverse force models, and stress state and axial force models. In the first part, the welding, transverse, radial, and tangential forces are modeled as a function of the rotational and welding speeds and the instantaneous angle of rotation. In the second part, a stress analyses for FSW process is developed using the slab method. The governing differential equations are obtained through the force equilibrium and the von Mises yield criterion, and solved to determine the stress state and the axial force. Experimental measurements for the forces and torque are performed for different parameters to calibrate and validate the models. The results show good agreement between the models and the experimental data