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Old 06-02-2005, 09:17 PM   #1
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On board welder

I have a modified GM 100 amp alternator that I use for a welder on my yj. I made it last year but had not tried it out yet. Well I got the chance to test it this weekend at Wiapourus (sp?) and it worked awsome My buddys fan clutch screwed up and the fan wouldnt turn. So we welded a bolt from the fan bolt and the shaft of the fan. Held up all weekend and everybody there watching were really impressed. I hear they had bets on it not working using one guy to hold a wire from the field to the battery, another to hold the engine at 1500 rpm's, and me holding a welding rod in a set of jumper cables

I have a couple of question though. On the internet I used a page that said to remove diode trio and the insulation off one of screws holding the voltage regulator. Is this now an AC or DC welder, and what polarity would I use? Welding rod on the positive or negative?

Another thing is when I was welding there was a strange loud whistling noise coming from the end of the welding rod doing the welding. It was strange. Anyone know why this noise?

Thanks
Kel

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Old 06-02-2005, 10:38 PM   #2
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I don't know much about welders, but i do know alot about electricity. The whistling noise is likely due to an excess of voltage. I know that in normal aplication, that may be cause for concern, but in a welder, it may be neccesary.

This is thought provoking. I'm going to look into it more.

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Old 06-02-2005, 10:46 PM   #3
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You know this IS interesting. I found the welding to be way too hot. I burnt a hole through a piece if 1/4 inch steel when I was doing this. Now that I know this works I will put a variable resistor between the alt field wire and battery so I can control the heat and mount some welding connectors so I can use real welding cables.

I would still like to know if this is AC or DC and what polarity to use.

Kel
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Old 06-02-2005, 10:53 PM   #4
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I just called a guy that builds starters and alternators for a living. He's an old pal. He says that the welder would have to be DC and that it seems to be too hot, not the voltage but the amperage. Other than that, he wasn't very helpful. I must know the answer to this!
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Old 06-02-2005, 11:07 PM   #5
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Hehe, keep diggin. It's just cool to know this thing works and I spent 15 bucks for the alt and some time to fabricate the mount.
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Old 08-22-2005, 07:14 AM   #6
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could i get a picture of this? sounds great, first time i'v herd of it though.

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