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AssigneePaul Opprecht
InventorsPaul Opprecht, Wolfgang Weil, Martin Kaul
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In a method for electrical resistance roll seam welding with a single electrode-wire, wherein the electrode-wire runs over first and second electrode carrier-rolls urged against each other, and the strength of the electrode-wire is increased by rolling-out before it enters the first electrode carrier-roll, elongations of the electrode-wire which can otherwise arise and lead to a slippage of the electrode-wire at the welding point and therefore, deleteriously affect the weld-quality can be largely prevented by reducing the electrode-wire temperature at the welding-point by cooling with a cooling device (17) the electrode-wire (12) between its rolling-out point (17/18) and its passage onto the first electrode carrier-roll (14) and/or between its departure from electrode carrier-roll (14) and its passage onto the second electrode carrier-roll (15).
In a method of electrical resistance roll seam welding with a single electrode wire comprising the steps of passing said wire through a rolling out stage to roll out the same and thereby increase its strength, and passing the rolled-out electrode wire in a given path over a first and then over a second electrode carrier roll while said first and second carrier rolls are urged against one another, the improvement comprising the step of positively cooling said electrode wire in at least one of a) a stretch of said wire path between said rolling-out stage and said first carrier roll or b) a stretch of said path between the first and second carrier rolls, by passing the wire in each such stretch through a cooling station to reduce the wire temperature a sufficient amount to increase its elastic limit above its elongation point under substantially a given set of welding conditions.
In an electric welding-machine for resistance roll seam welding with a single electrode-wire (12), comprising first and second electrode carrier-rolls (14, 15) over which rolls said electrode wire (12) passes in turn while moving along a given path, means for pressing said carrier rolls against each other, and means (17, 18, 19, 20, 21) for rolling out said electrode wire (12) before said wire reaches said first electrode-roll (14) to effect an increase in the strength of said electrode-wire (12), the improvement comprising at least one cooling-device (7) for cooling said electrode-wire (12) in at least one of a) stretch of said electrode wire path between the said rolling-out means (17, 18) and said first electrode carrier-roll and b) the stretch between said first and said second electrode carrier-rolls.
Dependencies are inferred from the claim text.