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Subject: Re: Switching a bridge rectifier in/out high current AC for selectable output
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Date: 10/11/03 at 7:52 PM
Posted by: Russ Kincaid
E-mail: russlk-nospam[AT55]yahoo.com (replace [AT55] with @ to reply)
In Reply to: Switching a bridge rectifier in/out high current AC for selectable output posted by jovanes on 10/11/03 at 12:45 AM:
Get some high current welding connectors, the tapered kind, and have seperate ones for AC and DC. You don't want to get involved with switching high current, and you won't be changing from AC to DC that often that unplugging and plugging the welding cables will be a problem.
An inductor in series with the DC will make starting the arc easier. I think 28 volts minus the diode drop will be marginal for easy arc starts. I built a welder using a 400 amp, 28 volt aircraft generator. It worked well but I am sure I used more than 28 volts, it would put out 60 volts with no problem.
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