Composite components and tool assembly for forming a composite component

The invention relates to a composite component (10) comprising at least two components (1, 2) having a friction stir formed by a connecting region (5). According to the invention, it is provided that one of the interconnected by the friction stir components (1) a form-locking geometry (16; 16a) which is adapted to transmit for producing the friction stir weld, a torque in an axis of rotation (12) of the component (1) to which the component (1) is arranged relative to the other component (2) rotatably.