Abstract: A method for joining at least two workpieces in abutment to each other by a joining element. The joining element 6 is driven so as to perform rotational and translational movements in order to be moved through the upper workpiece 2 and into the lower workpiece 4 without full penetration of the lower workpiece in order to provide for an integral one-piece joint between the joining element and the lower workpiece due to friction as a result of said rotational and translational movements. The joining process will result further in a joint between the joining element and the upper workpiece which is mainly a positively interlocking and/or friction joint. The workpieces remain in engagement to each other and are being interconnected. The method enables to join workpieces 2, 4 not only of similar but also of different materials such as aluminium/steel or plastic material/metal. Generally it is sufficient that the joining area is accessible only from one side.