Method of ensuring the maintenance of constant quality of spot w

Details Method of ensuring the maintenance of constant quality of spot w Method of ensuring the maintenance of constant quality of spot w

1979-02-14

1982-05-11

Reynolds, B. A.

Electric heating

Metal heating

For bonding with pressure

219108, 219137R, B23K 1124

Patent

active

043295614

ABSTRACT:
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 parts to be welded. When either the total electrical workpiece resistance of the parts to be welded has fallen below a given limit or when its rate of decrease is slower than a predetermined limit the changeover from preheating current to welding current is effected.

REFERENCES:
patent: 2848595 (1958-08-01), Van Sciver
patent: 3417221 (1968-12-01), Hayward
patent: 3504157 (1970-03-01), Vanderhelst
patent: 3538293 (1970-11-01), Procacino
patent: 3588438 (1971-06-01), Vanderhelst
patent: 3662146 (1972-05-01), Vanderhelst
patent: 4001539 (1977-01-01), Franchi et al.

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