Welding controller and/or pinching force controller

Details Welding controller and/or pinching force controller Welding controller and/or pinching force controller

1993-06-09

1995-08-08

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219 8641, B23K 1124

Patent

active

054400929

ABSTRACT:
A controller for a welding machine in which workpieces are pinched between a pair of electrodes through which welding current is supplied to weld the workpieces, the controller includes a circuit for detecting an amount of resistance between the electrodes, a circuit for monitoring occurrence of a phenomenon that interelectrode resistance detected by the detecting circuit shifts from an upward tendency to a downward tendency, and a circuit for cutting off welding current after occurrence of the phenomenon monitored by the monitoring circuit, and when an absolute value of a time derivative of the interelectrode resistances detected by the detecting circuit becomes less than the predetermined value.

REFERENCES:
patent: 4302653 (1981-11-01), Denning et al.
patent: 4419560 (1983-12-01), Zurek
patent: 4456810 (1984-06-01), Schumacher et al.
patent: 4503311 (1985-03-01), Houchens et al.
patent: 4694135 (1987-09-01), Nagel et al.
patent: 4792656 (1988-12-01), Namiki et al.
patent: 4963707 (1990-10-01), Zyokou et al.

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