Electric heating – Metal heating – By arc
Patent
1992-06-15
1993-05-18
Shaw, Clifford C.
Electric heating
Metal heating
By arc
21913021, 2191304, B23K 910
Patent
active
052123642
ABSTRACT:
An AC arc welding circuit for controlling current supplied to a welding electrode for welding thin metal pieces. A coupling circuit connects a capacitance circuit between a terminal of the secondary winding of a power supply transformer and the welding electrode. The other terminal of the secondary transformer is connected to the common electrode of the secondary winding which is, in turn, connected to a thin metal piece to be welded. The control circuit is provided with a sensing coil to sense the current flowing in the thin metal piece and to initiate a trigger pulse to switch a TRIAC to short-circuit the capacitance circuit during a predetermined short time as determined by the timing circuit so as to provide for a high voltage high current supply to the welding electrode during arc initiating when the electrode is spaced from the metal piece. After the predetermined time, the capacitance circuit is reconnected to the electrode to supply a low steady arc current so that the thin metal piece is not punctured during the initiating arc period and during the welding period.
REFERENCES:
patent: 2617913 (1952-11-01), Oestreicher
patent: 3301996 (1967-01-01), Bidwell
patent: 4628180 (1986-12-01), Edberg
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