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DC arc welding question

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Richard Fazio

02-15-2003 05:16:44




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I wanted to build a small dc welder using an alternator and battery, as per plans I see around on the web. But I was thinking, I have a bettery bank for power in the barn. Three banks of batteries at 48 volts, 500 amp hours. I use solar panels to charge. Why couldn't I attach welding cables directly to the batteries to weld. How would I govern the power so as to not have too much power. Anyone ever done anything like this? I know it would use a ton of power from the batteries. But this is only for occasional small welding jobs. I don't have enough power for my regular ac powered arc welder in the barn.

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Jim in Michigan

02-19-2003 06:41:41




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 Re: DC arc welding question in reply to Richard Fazio, 02-15-2003 05:16:44  
Go buy a welder,,it would be easier and safer,,,maybe even cheaper,,,Jim



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BB

02-19-2003 04:36:53




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 Re: DC arc welding question in reply to Richard Fazio, 02-15-2003 05:16:44  
You would need a current limiting circuit on the output. On welders there is a selector switch for current. Whatever you select, the current limiter only allows that maximum amount of current pass thru. If you did not have a limiter, it would dump whatever amount of current it could possibly generate. That would not be good for your batteries. Remember welding is basically creating a short circuit. A short circuit is near zero resistance. Current is voltage divided by resistance. 48 volts divided by zero is infinity. Infinite current of course is not possible. But it shows that the battery would be putting out all the current it battery could possibly generate.

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Bob

02-15-2003 20:36:17




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 Re: DC arc welding question in reply to Richard Fazio, 02-15-2003 05:16:44  
I would look into buying a small wire feed welder. Lincoln makes a good model, it runs off of regular 110 outlets, and can weld pretty well. They are very portable, and can be set up in many different ways.



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Richard Fazio

02-16-2003 09:31:22




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 Re: Re: DC arc welding question in reply to Bob, 02-15-2003 20:36:17  
I had concidered that. The problem is those welders are usually for small stuff aren't they? I would usually be welding heavy stuff, over 1/4" sometimes 1/2" or more. Can a 115 volt welder weld that?



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mfronk

02-17-2003 21:09:53




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 Re: Re: Re: DC arc welding question in reply to Richard Fazio, 02-16-2003 09:31:22  
no, nothing over 1/4



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