Resistance welding of aluminium

Details Resistance welding of aluminium Resistance welding of aluminium

B - Operations, Transporting

23

K

327/95

B23K 11/18 (2006.01) B23K 35/02 (2006.01)

Patent

CA 1266513

ABSTRACT Electrodes used for spot welding of aluminium workpieces are improved by a combination of steps:- a) A roughened surface is formed on the electrode tip, preferably to an average roughness depth of 12 to 30 microns. b) Also an artificial protective coating, e.g. a chromate-based coating or an anodic oxide film, is applied to the workpieces. c) Optionally the nugget diameter in the initial welding set-up is arranged to be not more than 15% greater than the minimum acceptable. Features a) and b) act synergistically to increase the service life of the electrodes, typically to more than 2000 welds.

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