Spot welding apparatus and method

Details Spot welding apparatus and method Spot welding apparatus and method

1992-10-01

1993-12-21

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

B23K 1124

Patent

active

052723062

ABSTRACT:
Welding overlapped work pieces in electrical contact with each other, the exposed surface of the lower work piece having an insulating coating. The overlapped work pieces are interposed between opposed first and second electrodes, the second electrode bearing against said coating. Initial current flow to said first electrode activates a circuit which results in heating the work pieces to melt the coating under the second electrode, whereupon current flows between the electrodes to produce a spot weld. Detection means senses the flow of current between the electrodes and sends a signal to a switch to render inoperative the heating circuit. This reduces the heated region extending outwardly from the spot welding area to prevent deterioration in the strength of the welded work pieces because of a change in the quality of the metal. The apparatus also conserves power normally consumed for heating.

REFERENCES:
patent: Re29762 (1978-09-01), Becker
patent: 3462577 (1969-08-01), Helms et al.
patent: 3538293 (1970-11-01), Procacino
patent: 4876430 (1989-10-01), Herschitz et al.

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