Friction stir additive manufacturing is a growing solid-state technique used to manufacture components with simpler geometries through friction stir lap welding of multiple thin sheets of materials. Being performed in a solid-state friction stir additive manufacturing avoids the defects associated with solidification. The process can therefore be used to produce components out of the AA2xxx and AA7xxx, two series that are highly used within aerospace industry. Friction stir additive manufacturing has been suggested by researchers in the field to be used to manufacture stiffeners and stingers for aircrafts and is today being used to produce stingers for the fuselage. In this study experimental work has been performed to find a suitable tool and optimal welding parameters for friction stir additive manufacturing sheets of AA2017 and AA7020. The experimental work was performed as there is limited scientific research regarding welding parameters for specific materials. To find a suitable tool and optimal welding parameters 10 friction stir lap weld samples were produced using different sheet configurations. These were characterized and tested through visual surface inspection, cross-section microscopy and hardness testing. The tool found suitable, and welding parameters found optimal were used to produce a four layered sandwiched structured sample. This sample was characterized and tested using the same methods as for the friction stir lap weld samples with the addition of scanning electron microscopy. Three of the four layers were successfully joined together, as there were large root tunnels in the top weld. This was caused by the gap between the third and fourth sheet from previous welds shoulder plunge depth. For the AA2017 the effect on hardness was small, as the CuAl2 precipitates in the base material before welding also appeared in the stir zone after welding. For the AA7020 there was a significant drop in hardness. The effect on the MgZn2 precipitates could however not be established, as these were to fine in size to be seen using the scanning electron microscopy. Therefore, future work would be required to establish the effect on the AA7020 precipitates.