Method for welding workpieces with a joining element for mounting of components of car body part, comprises moving the joining element relative to the first workpiece during welding and simultaneously pressing against the workpiece

The method comprises moving a joining element (3) relative to a first workpiece (1) during welding and simultaneously pressing against the first workpiece, where the joining element and the first workpiece partially consist of a metal. An electric current flow is produced between the workpiece and the joining element during the mechanical contact of the joining element. The joining element rotates and is pressed in axial direction against the first workpiece. The joining element of the first workpiece not completely permeates. The method comprises moving a joining element (3) relative to a first workpiece (1) during welding and simultaneously pressing against the first workpiece, where the joining element and the first workpiece partially consist of a metal. An electric current flow is produced between the workpiece and the joining element during the mechanical contact of the joining element. The joining element rotates and is pressed in axial direction against the first workpiece. The joining element of the first workpiece not completely permeates. The first workpiece consists of a composite material with two different material layers. The first workpiece consists of two external metal layers (4) and an internal plastic layer (5). The electric current impulse is 100A-2500A. The number of revolutions of the rotating joining elements is 400-5000 revolutions per minute. The duration of the current impulse is 500 ms - 1000 ms. The current impulse is initiated by a movement of the joining element in the direction of the first workpiece. The current impulse is initiated directly before stopping the friction movement of the joining element relative to the first workpiece. A bolt with frustoconical head is used as the joining element. The head of the frustoconical bolt has an angle of 60[deg] . A second workpiece is connected over the joining element with the first workpiece. Die Erfindung betrifft ein Verfahren zum Verschweißen eines ersten Werkstücks mit einem Fügeelement, wobei das Fügeelement und das erste Werkstück zumindest teilweise aus einem Metall bestehen, das Fügeelement relativ zum ersten Werkstück während des Verschweißens bewegt wird und gleichzeitig gegen das erste Werkstück gepresst wird. Die Aufgabe, ein Verfahren zum Verschweißen eines Fügeelements mit einem Werkstoff zur Verfügung zu stellen, welches eine prozesssichere stoffschlüssige Verbindung zwischen Fügeelement und Werkstück ermöglicht, wenn das Werkstück aus einem Verbundwerkstoff besteh