Friction stir welding (FSW) is particularly suitable for joining non-ferrous metals with a low melting temperature. It is also possible to join material combinations such as aluminum and steel with this solid-phase joining process. The Friction Stir Welding technology is ideal for sealing of a battery housing. With the solid phase joining process Friction Stir Welding, mixed compounds such as aluminum with steel or non-ferrous metals with a low melting temperature are optimally and economically