Method of ensuring the maintenance of constant quality of...

Details Method of ensuring the maintenance of constant quality of... Method of ensuring the maintenance of constant quality of...

B - Operations, Transporting

23

K

327/95

B23K 11/10 (2006.01) B23K 11/25 (2006.01) B23K 11/34 (2006.01)

Patent

CA 1060957

ABSTRACT OF THE DISCLOSURE A method of improving the reproducibility of the welds in an electric spot welding machine comprises prior to the initiation of a welding operation passing a preheating current of lower magnitude than the welding current through the weld nugget. when the total electrical resistance of the weld nugget has fallen below a given limit within a given time the preheating current is changed over to welding current.

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