Method of using copper based electrodes to spot-weld aluminum

Details Method of using copper based electrodes to spot-weld aluminum Method of using copper based electrodes to spot-weld aluminum

B - Operations, Transporting

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B23K 11/10 (2006.01) B23K 11/11 (2006.01) B23K 11/18 (2006.01) B23K 35/02 (2006.01) B23K 35/22 (2006.01) B23K 35/40 (2006.01) C22C 1/04 (2006.01)

Patent

CA 2204076

A method for spot-welding aluminum workpieces with copper electrodes that comprises the steps of: (a) super heating copper and one or more elements X that normally have little or no solubility in copper at room temperature, such super heating being a temperature at which X is soluble in copper, X being selected from te group of Mo, Ta, V, and W, and other elements that form monostectic or peritectic phases with copper and aluminum devoid of a eutectic, X being present in an amount of 4-15% by weight of the copper; (b) rapidly cooling in the solid solution to room temperature to retain such elements in solid solution; (c) either concurrently or subsequent to step (b), forming the solid solution as an electrode shape; and (d) passing current through the electrode shape to effect spot-welding of the aluminum workpieces. Super heating and rapid cooling may be carried out by atomizing a melt of Cu and X with a pressurized gas that directs the spray onto a target for further cooling and eventual working or shaping.

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