Electric heating – Metal heating – By arc
Patent
1992-05-04
1993-11-23
Shaw, Clifford C.
Electric heating
Metal heating
By arc
21913051, B23K 9073
Patent
active
052646793
ABSTRACT:
Disclosed is a TIG welding apparatus having an electrode connected to a power supply which applies to the electrode a predetermined voltage of either a negative or positive polarity. Control logic controls the electrode polarity to create a welding phase with the electrode at a negative polarity, a cleaning phase with the electrode at a positive polarity, and a momentary power off phase as the polarity of the electrode is switched. An arc initiation unit reestablishes the arc after start up when the polarity of the electrode is switched from a negative and a positive polarity. This arc initiation unit includes a transformer circuit having a primary and a secondary winding, a capacitor, and charging means to charge the capacitor while the electrode is at negative polarity, means to isolate electrically the charging means from the power supply when the polarity of the electrode is positive, and means for discharging the capacitor through the primary winding. The capacitor discharge is enabled with each transition of the polarity of the electrode from negative to positive, and discharged when the voltage of the electrode reaches a predetermined level to provide good welding performance.
REFERENCES:
patent: 4963715 (1990-10-01), Tuttle
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