This work studies the thermal effect generated by the friction stir welding process through analysis of finite volumes applying remeshing techniques in welded joints of commercially pure aluminum AA1100. The modeling was realized using the physics properties of the welding material and the working tool in function to the temperature generated, considering the process variables, tool rotation speed, tool transverse speed, tool tilt angle and tool geometry. The solution methods were used through multiphysics to couple the behavior of the fluid mechanicals and the structural analysis in a transitory state. As a result, tool-workpiece interface temperature distribution profiles to different positions of tool transverse speed were obtained, showing an excellent approximation linked to the reconstruction of the mesh