Because of the physical and chemical properties of aluminum and its alloys, its welding is difficult and limited to certain welding processes. One of the more suitable processes for welding aluminum and its alloys is friction stir welding. It is a thermomechanical process in which welding takes place at lower temperature, and the weld is further influenced by the pushing force what leads to good mechanical properties.
In this paper, we studied the influence of different welding parameters on the quality of the weld. We were welding by a matrix system with feed speeds of 73, 93 and 116 mm/min and rotational speed 750, 950 and 1180 rpm, what gave us 9 samples. For each sample we made a visual, tensile strenght, hardness, microstructure, temperature during welding and bend angle analysis. On the basis of the analysis we found that optimal parameters are welding speed 93 mm/min and rotational speed 950 rpm. For this parameters the revolution per feed (RPF) factor was 10.2. For RPF factors lower or higher than optimum, we got lower quality of the weld due to high energy intake or poor mixing within the weld.