A C-shaped tool holder consisting of an integral frame structure that is delimited by an inner and an outer edge, each C-shaped, in which the C-shaped edges are made from and are connected to each other by at least five multiple-vertex frame bodies that are integrated into the frame structure, in particular triangles, quadrilaterals and pentagons, wherein in each case an inner side of the individual multiple-vertex frame bodies is a connecting surface, continuously curving along a circumferential direction, along the sides of the respective multiple-vertex frame body, and the inner and the outer C-shaped edge is each delimited to the outside by a continuously curving lateral surface.

A welding device for joining components by resistance welding includes a pair of electrodes which can introduce an electrode force and an electrical welding current I.sub.S1 into the components, at least one further pair of electrodes which can introduce an electrode force and a further electrical welding current I.sub.S2 into the components, a power source which can generate the electrode forces, a coupling link which is mechanically connected between the power source and the pairs of electrodes and which can divide a total electrode force that can be generated by the power source into the electrode force and the further electrode force.

Methods and apparatuses for extending the range, reach, and/or length of a welding tool. A welding extension in accordance with an aspect of the present disclosure comprises an extension bar that couples between a welding tip and a welding head, such that material passes from the welding head to the welding tip through a bore in the extension bar.

An electronically-controlled electric resistance welding head and method having a support structure and the electrodes located on the same side. The welding head including a ground electrode having an elastic device and a detecting device for detecting a force load on the elastic device on contact with a component to be welded. A welding electrode is movable relative to the ground electrode and the support structure to contact the component to be welded. An electronic control unit is operable to selectively increase the force applied by each electrode when in contact with the component to be welded until respective threshold values are achieved. Current is generated by a transformer for passage to the electrodes.

A welding rod fastening method capable of fixing the welding rod perpendicularly to a welding surface to reduce a spattering phenomenon in which fine metal particles scatter around a welded portion due to an incorrect welding angle when welding, and a welding device in which the welding rod is fastened vertically thereby. The welding rod fastening method is a method for fixing a welding rod to a welding rod fixing block having a welding rod housing hole formed therein, and includes inserting the welding rod into a welding rod housing hole of the welding rod fixing block, and fastening fixing screws to spaces on both sides of the welding rod housing hole on the basis of the welding rod to tighten the welding rod housing hole. The fixing screws fastened to the spaces on both sides of the welding rod housing hole are tightened in tightening directions that are opposite to each other.

A joining apparatus for panel sheets and a joining method for panel sheets using the same are provided. The joining apparatus includes an element punching device which stores and supplies elements according to a specification of a panel sheet and inserts the element into a first panel sheet among different types of panel sheets. Additionally, a welding device resistively welds a part of the first panel sheet into which the element is inserted by the element punching device.

A projection welding electrode holder has a holder body, a holder barrel, and a coned-disc spring. The holder body is configured for attachment to a welding machine and defines a holder body bore. The holder barrel is carried within the holder body bore and has a holder head that extends therefrom for attachment to a welding electrode. The holder barrel is movable relative to the holder body between a first position, in which the holder head extends from the holder body bore a first distance, and a second position, in which the holder head extends from the holder body bore a second distance, the first distance being greater than the second distance. The coned-disc spring resides within the holder body bore, biases the holder barrel toward the first position, and is compressed by movement of the holder barrel from the first position to the second position.

An apparatus of a setting welding device for an auxiliary joining part with a head and a shaft, includes a linear drive fastenable at the setting device and including an element nest at a movable end, in which an auxiliary joining part is releasably receivable from a transfer unit. The element nest is movable by the linear drive in a first direction. The element nest is supported in a floating manner, and is positionable via a mechanical stop alignment in abutment with an electrode punch in the joining direction below the electrode punch. And/or the element nest is connected with the linear drive via a mechanical direction-changing coupling component so that the element nest is movable by the linear drive in a second direction so that the auxiliary joining part is positionable at the joining location, wherein the second direction is not parallel to the first direction.

A spot welding assembly for welding a first work piece to a second work piece. The spot welding assembly includes a base. A base electrode is coupled with the base for supporting the first work piece. A welding gun is moveable toward and away from the base. A gun electrode is coupled with the welding gun for supporting the second work piece and for locating the second work piece against the first work piece upon movement of the welding gun toward the base to allow the first and second work pieces to be welded to one another. The base electrode is rotatable and pivotable relative to the base, and the gun electrode is rotatable and pivotable relative to the welding gun.