System for and method of controlling resistance welder

Details System for and method of controlling resistance welder System for and method of controlling resistance welder

1994-09-21

1996-01-09

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

B23K 1124

Patent

active

054830354

ABSTRACT:
A resistance welder controller is disclosed, which controls a resistance welder for welding workpieces clamped between two electrodes with Joule heat generated by passing a welding current between the electrodes. The controller includes a preliminary current passing device for passing preliminary current between the electrodes until the workpieces and the electrodes become intimate with one another, a regular current passing device for passing regular current between the electrodes for welding the workpieces, a current control device for controlling the welding current according to the rate of expansion of the workpieces or the rate of increase of the resistance of the workpieces, and a current passing ending device for ending the welding current at or after an instant when the rate of expansion of the workpieces or the rate of increase of the resistance of the workpieces has become substantially zero.

REFERENCES:
patent: 4028522 (1977-06-01), Chihoske et al.
patent: 4329561 (1982-05-01), Schafer et al.
patent: 4456810 (1984-06-01), Schumacher et al.
patent: 4678887 (1987-07-01), Nagel et al.
patent: 4694135 (1987-09-01), Nagel et al.

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