Abstract: The invention relates to a process for protecting an internal thread (7) of a blind rivet (2) during a second operation, such as painting or lacquering, wherein the internal thread (7) is provided with a mandrel (9) having a shank 12 with an external thread, which mandrel (9) is connected to the blind rivet (2) during riveting of the blind rivet (2) to a workpiece (1) and remains in the internal thread (7) during the second operation so as to protect the internal thread (7) from soiling during the workpiece (1) and the blind rivet (2) having its surface worked on, as by being painted.

Abstract: The invention relates to a process for forming a punch rivet connection and to a joining device, a plunger (4) and optionally a clamp (5) being driven via a transmission unit (2). The transmission unit (2) converts a rotational movement of an electric motor drive unit (1) into a translation movement of the plunger (4) or of the clamp (5).

Abstract: The invention provides a tack gripper for a tack welding gun wherein the tack gripper is U-shaped in design. The tack gripper has two arms connected by a base. At least one arm of the tack gripper is resilient in design. The arms have a bent back portion at their free end. The portion is arranged between the respective arms. The portions contain holes in which the catch knobs formed on the workpiece to be welded can engage.

Abstract: The invention relates to a process for the application of components strung together in the manner of a belt onto workpieces in which the components are intermittently brought successively into a separating position for a respective component. The component halted in the separating position is initially grasped by a spatially movable jointing tool brought to the separating position over a free path, the jointing tool being held in its position defined by the halted component, the grasped component then severed from the subsequent component and is finally transferred by the jointing tool into the respectively desired jointing position remote from the separating position, in which the component is fastened on the workpiece, for example by electric arc welding.

Abstract: The invention provides a gripper for a tack welding gun wherein the tack gripper is U-shaped in design. The tack gripper has two arms connected by a base. At least one arm of the tack gripper is resilient in design. The arms have a bent back portion at their free end. The portion is arranged between the respective arms. The portions contain holes in which the catch knobs formed on the workpiece to be welded can engage.