In this study, the efficacy of pre-heating using solid friction heating was numerically investigated to improve the heating process of the friction stir welding with heating, which made the high speed welding by pre-heating the whole aluminum metal. At first, the solid friction heating by advancing rotating heating tool generated solid frictional heat on tool contact area was suggested. Then the temperature variation with time of aluminum metal under the solid friction heating was calculated based on the finite difference approach. As the result, the temperature calculated showed that the peak temperature increased as increasing contact area of heating tool and decreased with increasing advancing speed of heating tool. And the temperature by the heating tool rose sufficient to replace partially the heating process in the friction stir welding with heating. Furthermore, the possibility of the heating process using the solid friction approach for the friction stir welding with heating was discussed by comparing calculated temperature with weldable conditions.
