H - Electricity – 05 – B
Patent
H - Electricity
05
B
327/100
H05B 7/144 (2006.01) B23K 9/09 (2006.01)
Patent
CA 1101499
BFN 6639 WELDING POWER SUPPLY ABSTRACT OF THE DISCLOSURE A square wave welding power supply system in- cludes two constant current power sources. The first power source (1)) is preferably an SCR controlled power supply having an output connected in an arc circuit (15 through an inverter circuit including (SCR-1 through SCR-4) which controls the polarity and duration of the welding current applied to the arc circuit. The second power supply (20) is preferably a reactor power supply for supplying additional welding current during one polarity of the square wave. A shorting means (SCR-5) is connected across the output of the second power sup- ply to maintain current flow therefrom during those intervals when the output of power supply (20) is not connected to the arc circuit. A gating circuit (30) controls the SCRs (SCR-1 through SCR-5) and commutation circuits (C-1 through C-5) connected across each SCR. A diode (D1), or SCR, is connected in series with the second power supply output to prevent short circuiting of the arc by (SCR-5).
329783
Gowling Lafleur Henderson Llp
Hobart Brothers Company
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