View Full Version : Spot welder?

09-20-2003, 07:48 PM
I have this gianormous transformer with a ribbon wound secondary. It has exactly zero markings or specs. Does anyone have any idea what this is from? I suspect it would make a good spot welder. I haven't tried it under power and am a bit concerned since it probably puts out a 1000 amps at 1.2 volts or something like that. Ideas?



09-20-2003, 09:06 PM
I can't tell by the pictures but about how many winds are in the secondary? If it's one or two, it's probably for a spot welder but the ribbon wire looks too small. I also can't tell the size but my small 220v SW puts out almost 7000amps!
Cool piece! Ship it to me and I'll check it out....LOL

09-20-2003, 09:27 PM
Looks like a 110/220 primary, are the windings separate? If so, hook up in series for 220, or in parallel for 110. Either way, if you blow a breaker, reverse the connections to one coil only, and try again. You're not going to hurt it by trying, and you'll be able to measure the output voltage, no-load. That should help to decide what it was used for, or what you can use it for. My only concern trying it would be an accidental short on the secondary, which could give you a burn, or damage your eyes by the resulting arc.

[This message has been edited by darryl (edited 09-20-2003).]

09-20-2003, 10:14 PM
It looks like five or six turns of the secondary. BUT, the secondary ribbon is tri-laminate, three layers of ribbon together making it about 3/32 thick. I haven't measured the primarys, I think I will do that tomorrow.

Ken, NO http://bbs.homeshopmachinist.net//biggrin.gif

09-21-2003, 09:18 PM
3Ph wye primarys?

I could be a 2 Kilowatt transformer - looks about the same size as my power amp's.

What old xerox equipment did that come from? http://bbs.homeshopmachinist.net//biggrin.gif (he, he)

09-22-2003, 12:03 PM
Nope, not from Xerox. I didn't get around to measuring it yesterday, too busy cleaning out my garage. I'm considering moving my shop into the garage but have to do some wiring, insulation and wall finishing first. Making real good progress, I can now see the floor in a lot of places.

09-22-2003, 10:17 PM
I got a very large battery charger for Hysters.. it has similar looking transformers in it. About 50+ pounds each. They are single phase each. feeding a bridge each. Diodes are about 4 inch dia hockey puck type, 2 per transformer. Then the 2 scrs and relays in the other legs of the bridge. I think, 24vdc.. not sure.. Multi-tap input.

I think 3 of them in this charger. I am going to retain at least two of them for anodizing and possibly plating. Charger weighs excess of 500+ pounds total.

I will ebay the other one probably.