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Century welder AC TO DC CONVERTER????

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Ray

11-29-2002 12:29:20




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Ok, heres the $6.43 question. Century welders used to make a UNIVERSAL DC CONVERTER model #131-20 that was built to sit on top of a century AC welder and converted it to a DC welder. Century has since been sold to someone who has absolutely no idea as to what I am talking about. It had a maximum AC input of 300 amps and weighed 40 pounds.It had a maximum DC output of 240 volts. I found one on ebay one day and went tooth and nail trying to outbid two other bidders in the last 2 minutes of the auction but was unsuccessful and have spent many computer hours trying to find another one. If anyone knows where to find a used one I would appreciate hearing from them. Thankyou

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peter potenza

05-17-2005 21:23:00




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 Re: Century welder AC TO DC CONVERTER???? in reply to Ray, 11-29-2002 12:29:20  
Have any luck finding or building this dc converter. I actually am trying to accomplish the same thing to my 295amp 20th century heavy duty ac welder. So far I must have close to $300 invested: 4 - 300amp/600v diodes,2 X-large heat sinks, a pr of 150 amp diodes, & foolishly purchased a 3 phase dc converter(thinking I could convert it to single phase).I've spent hrs & hrs researching this and made very little progress. Besides the rect/bridge you need something to stablize the arc. Currently I'm trying to build a high/freq. arc stablizer. I had a professional draw me up 3 dif. ways of doing this. & I'll keep you posted on my progress provided you do the same, peter

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Farmered

12-02-2002 03:34:55




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 Re: Century welder AC TO DC CONVERTER???? in reply to Ray, 11-29-2002 12:29:20  
Just a suggestion,Ray. Eliminate that last minute bidding fury on E-bay. Just bid the maximum that you will go on an item. It will automatically increment up to your maximum bid or if the other bidders give up sooner you may get it for a lot less. It also does away with the temptation to make "just one more bid" which sometimes happens several times, and you pay way too much. Also you don't have to be around at closing time, just set it and fergit it. Ed

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Bus Driver

11-29-2002 16:12:33




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 Re: Century welder AC TO DC CONVERTER???? in reply to Ray, 11-29-2002 12:29:20  
Kraig mentions using a big diode for the rectifier. If you decide to do this yourself, you will need 4 diodes with the amperage capacity (or more) of your welder, voltage of 95 or higher and configure them in a "bridge" circuit with an adequate heat sink. The bridge circuit will give almost 100% amperage output. If your project gets that far, some here will be able to help.



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kraig WY

11-29-2002 15:05:27




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 Re: Century welder AC TO DC CONVERTER???? in reply to Ray, 11-29-2002 12:29:20  
I got a great big diod I use to change my AC buzz box to DC, but it also cuts the Amperage in half. If interested I'll hunt it up and post a picture of it. Some mentioned on this board that it would work but it does.



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Ray

11-29-2002 18:00:41




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 Re: Re: Century welder AC TO DC CONVERTER???? in reply to kraig WY, 11-29-2002 15:05:27  
I think that i'm probably up to the challenge of converting the welder myself. Sounds like a fun project. I taught myself to assemble and program a computer from scratch,a process that now takes less than seven hours from start to finish so I guess a welder conversion should be somewhat easy. I just need to figure out the basics of how its done and I appreciate the feedback. Thankyou. Ray



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