Abstract: A welding electrode unit includes a repositioning device that is movable. The repositioning device includes an energy storage device by way of which a welding electrode is connected directly or indirectly with the energy storage device can have a force applied to it for the purpose of a repositioning movement. The repositioning device is movable into a welding position by way of a forward movement and can be locked in the welding position.

Abstract: A welding electrode unit may include a repositioning device that is movable. The repositioning device may include a stored-energy means by way of which a welding electrode connected directly or indirectly with the stored-energy means can have a force applied to it for the purpose of a repositioning movement. The repositioning device can be moved into a welding position by way of a forward movement and can be locked in the welding position.

Abstract: A device (1) is provided for connecting a metal sheet (23, 33?) at the edges, particularly body sheet metal in automobiles. The device (1) includes at least one folding bed (2) for receiving at least two metal sheets, folding jaws (3) which are functionally connected to associated folding jaw supports (4), at least one thermal jointing tool (5), and at least one mass electrode (9, 9?). At least the joining tool is not attached to the folding jaws, and the joining tool contains a lever oriented away from the folding bed as a linear feed device. The lever (6) has a center of rotation (10) outside the folding bed, wherein the joining tool can swivel in the manner of a knee lever into an operating and/or non-operating position.

Abstract: A device (1) is provided for connecting a metal sheet (23, 33?) at the edges, particularly body sheet metal in automobiles. The device (1) includes at least one folding bed (2) for receiving at least two metal sheets, folding jaws (3) which are functionally connected to associated folding jaw supports (4), at least one thermal jointing tool (5), and at least one mass electrode (9, 9?). At least the joining tool is not attached to the folding jaws, and the joining tool contains a lever oriented away from the folding bed as a linear feed device. The lever (6) has a center of rotation (10) outside the folding bed, wherein the joining tool can swivel in the manner of a knee lever into an operating and/or non-operating position.