Control circuit for the current of a welding transformer

Details Control circuit for the current of a welding transformer Control circuit for the current of a welding transformer

1986-01-30

1987-06-09

Shaw, Clifford C.

Electric heating

Metal heating

For bonding with pressure

219 911, 219109, B23K 1124

Patent

active

046721665

ABSTRACT:
The invention is directed to a control circuit for controlling the current of a welding transformer integrated in an industrial robot. For the purpose of achieving a simpler, more accurate and more reliable detection of contact between the welding tongs (4, 5) and the parts (11, 12) to be joined by welding, there are provided a high-frequency generator (1) for supplying measuring current to the secondary circuit (2) of the welding transformer, an impedance measuring circuit (3), an additional impedance (7) for increasing the impedance of the secondary current (2) to high frequency, an interrupter circuit (8) for interrupting the welding current, and a comparator for enabling the welding current merely in the presence of a differential voltage signal which corresponds to complete contacting of the two parts to be joined by welding.

REFERENCES:
patent: 2510956 (1950-06-01), Brown
patent: 3725636 (1973-04-01), Toth

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