B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/113, 327/90,
B23K 11/30 (2006.01) B23K 11/18 (2006.01) B23K 35/02 (2006.01)
Patent
CA 1206212
ABSTRACT OF THE DISCLOSURE: Spot- and projection-welding of aluminum sheets has always been connected with difficulties, mainly because of the surface layers of aluminum oxide, and even by pickling, these difficulties could be only partly eliminated. The main diffi- culties have always been unsufficient electrode life times, the unsatisfactory quality of the weld and especially the unsolved problem of achieving good quality welding and long electrode- life when using un-pretreated aluminum sheets. The problem has been solved in principle by using electrodes having pro- filed contact-surfaces, by means of which the layer of oxide is broken during pre-pressing and a direct contact between the electrode and unoxidized material of the workpiece is provided, the contact-resistance of which is lower than the portion of the overall resistance of the point of weld formed by the metal of the aluminum sheets to be welded together. In an appro- priate welding machine, the means for switching-on the welding current are controlled in such a manner that the welding cur- rent is switched on only after a sufficiently large contact area and therewith a sufficiently low contact-resistance of this contact has been reached.
422612
Opprecht Paul
Robic Robic & Associes/associates
LandOfFree
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