Fronius International Gmbh

Manfred Wimmer

Walter Stieglbauer

Karin Himmelbauer

Helmut Friedl

Wolfgang Zauner

Dieter Hoeller

Heinz Hartl

Dieter HÖLLER

A detection device for detecting a diameter and/or composition of a welding wire and/or welding electrode for a welding device, includes an oscillating circuit, which has a coil through which the welding wire and/or welding electrode can be passed. The device further include an evaluation unit connected to the oscillating circuit for determining at least one first oscillating circuit parameter which is characteristic of an attenuation of an oscillation signal occurring in the oscillating circuit, and at least one second oscillating circuit parameter which is characteristic of a signal frequency f of the oscillation signal occurring in the oscillating circuit. The evaluation unit detects the diameter and/or composition of the welding wire passed through the coil of the oscillating circuit and/or of the welding electrode using the determined oscillating circuit parameters.

Method and device for detecting a welding wire diameter or welding wire composition in a welding device

A spot-welding tool having at least one electrode for resistance welding of workpieces such as metal sheets. The spot welding tool has a pressure element for holding down the workpieces arranged on the electrode in a region of the electrode cap to prevent process-dependent warping or arching of the workpiece.

Spot-welding tool

A method for resistance welding for welding two workpieces to one another using spot-welding tools. In the method, two electrodes of the spot welding tool are pressed against each other, and the electrodes are powered with energy. The workpieces are interposed and contact of the workpiece with the spot-welding tool is detected with a pressure element movably arranged on at least one of the electrodes and projecting beyond the electrode. The pressure element is then displaced relative to the electrode until the electrode contacts the workpiece.

Resistance-welding method

A device for protecting an electrode during the resistance welding of workpieces, particularly of metal sheets, is made of a strip that is placed over the electrode, in a manner that enables it to be displaced in relation thereto. In order to reduce the wearing of the electrode, the strip is formed from at least two metal strips, which are arranged one atop the other and which are made of different materials. The materials of the metal strips are preferably matched to the material of the electrode and to the material of the workpiece, particularly the metal sheet, with regard to predetermined properties. A spot-welding tool is provided for carrying out the resistance welding of workpieces, particularly of metal sheets, having at least one electrode. A resistance welding method welds two workpieces, particularly metal sheets to one another by spot-welding tools.

Electrode protection device, spot-welding tool and resistance welding method

A method for monitoring the quality of spot welding, in particular for robotic applications. Workpieces, such as metal sheets are welded together using spot welding tools. The sheets are placed between at least two electrodes, which are pressed against one another and supplied with energy. The spot weld is evaluated using an evaluation element, in particular an optical visualization. A tape is placed between the electrodes or electrode caps and the sheets. The tape is transported onwards after the welding process. The tape is configured in such a way that a mirror-image, in particular a proportional reproduction or impression of the spot weld that has been produced on the workpiece is created by the welding process on the tape. The reproduction or impression is detected and evaluated by the evaluation element and the size, shape and position of the spot weld are deduced.

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Wels, Austria

Manfred Wimmer