Aluminium alloys series 2XXX and 7XXX are not normally considered  weldable by traditional methods. They are widely used as a part of aerospace structures. The common practise joining technology is riveting. Emerging technology of friction stir welding (FSW) has shown promising results in welding of these alloys. In this thesis we have investigated application of FSW technology in aircraft structures mainly as substitution of riveting on stringer reinforced panels. Manufacturing process steps were determined and further optimisation procedures were suggested. Knowledge base for setting basic welding parameters has been created and comparison of a sample of riveting and FSW technologies on a simple final element method model sample was examined in order to identify differences in stress distribution character in the riveted and FS welded samples.