Connecting at least two abutting components

The invention relates to a compound of at least two abutting components (5, 6) by means of a pin-shaped connecting element (1) having a shank (3), which merges into a tip (2) and an expanded head (4) for driving the connecting element (1 ) (under pressure and Rotationsbeaufschlagung a tool 8), wherein the fixed connection is created via frictional heating and local deformation of the component materials. According to the invention the shaft (3) is at least in sections with elevations and / or depressions (3a), which produced by a flow of heated material a positive connection between the connecting element (1) and at least one of the components (5, 6).