Contemporary Engineering Sciences, Vol. 10, 2017, no. 34, 1659 - 1667 HIKARI Ltd, www.m-hikari.com https://doi.org/10.12988/ces.2017.711156 Thermo-Mechanical Modeling of Friction-Stir Welding Tool Used in Aluminum Alloys Joints Jonathan Fabregas Villegas 1 , Jennifer Villa Dominguez 2 , Guillermo Valencia Ochoa 3 and Jimy Unfried-Silgado 4 1 Grupo de Investigación IMTEF, Programa de Ingeniería Mecánica Universidad Autónoma del Caribe, Colombia 2 Grupo de Investigación GI Fourier, Facultad de Ingeniería Mecánica Universidad Antonio Nariño, Colombia 3 Grupo de Investigación KAI, Programa de Ingeniería Mecánica Universidad del Atlántico, Colombia 4 Grupo de Investigación, Ciencia y Tecnología ICT, Departamento de Ingeniería Mecánica, Universidad de Córdoba, Colombia Copyright © 2017 Jonathan Fabregas Villegas et al. This article is distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract In this paper we study the thermomechanical effects generated in the tool used in the friction-stir welding (FSW) process by finite element analysis (FE) in welded joints of structural aluminum AA1100. A modeling was carried out using Structural Multiphysics and Computational Fluid Dynamics (CFD) couplings using tools with three different shoulder profiles (flat, spiral and concentric), in order to evaluate the influence of its geometry on the heat generated during the process and heat transferred and mechanical stress on the tool. As a result, thermal profiles, stress analysis, heat generated in the process and torque transmitted in the joint and tool interaction zone were obtained. In addition, the values of heat loss through the tools were estimated, which are less than 10%, with 87% of the melting temperature reached of the joints, corroborating the established in the literature.