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Tool Talk Discussion Forum

Century welder transformer

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TJM

02-02-2005 05:15:49




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I have a Century welder (model 117 007) and the transformer is bad. The internal fuse in the transformer is blown. Technical support at Lincoln Electric told me the transformer needs to be rebuilt to replace the fuse. I live in Maryland and have been unable to find anybody to rebuild the transformer. For the Maryland readers, any suggestions on places to contact? For others, any suggestions on where to ship the transformer for a rebuild? Also, do you think it would be more economical to buy a new transformer as opposed to having the old one rebuild. Thanks in advance for your help.

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dr.sportster

02-02-2005 19:20:46




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 Re: Century welder transformer in reply to TJM, 02-02-2005 05:15:49  
TJM,Sure you have nothing to lose to unwrap the windings.I think this fuse will actually look like a burned up piece of wire.I think you could use a similar size.I would revarnish as you rewrap the winding.Also the reason it burned was to protect the whole winding you may have had it maxed out.Watch out for asbestos in the insulating paper.I have unwound transformers for scap but not welder repair.Good luck.

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dr.sportster

02-02-2005 08:51:45




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 Re: Century welder transformer in reply to TJM, 02-02-2005 05:15:49  
The transformer has to be rebuilt to replace the fuse?Somethings not right here.I would do more research on that.



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TJM

02-02-2005 08:58:47




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 Re: Century welder transformer in reply to dr.sportster, 02-02-2005 08:51:45  
Tech support at Lincoln Electric (who now owns Century) told me that there is a thermal fuse wound into the transformer. The tech support person gave me some continuity tests to perform in order to confirm the status of the transformer. Sure enough, no continuity through the transformer. I could not believe a thermal fuse would be placed inside transformer, so I did some searching. Sure enough, this is common practice!

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dr.sportster

02-02-2005 09:13:18




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 Re: Century welder transformer in reply to TJM, 02-02-2005 08:58:47  
Oh ok,If thats the case I agree with hay.Only would add buy a new Miller.[just kidding Lincoln is a good company also]I would not be buying another Century anyway.Perhaps you did not have enough duty cycle for your needs.Now Im sure the tech knows this but the primary and secondary on transformers dont have continuity to each other only by magnetic fields.



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Bob

02-02-2005 09:12:32




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 Re: Century welder transformer in reply to TJM, 02-02-2005 08:58:47  
Yup, you're right about the thermal fuse thing... transformers in everything from wall-plug transformers to heavy industrial stuff are made that way.

If you are "handy", it is possible you could carefully unwind the transformer enough to get at the theraml fuse, replace it, and then re-do the windings.

The thermal fuses usually have numbering on them, or color codes, and there ARE sources for replacements for many of them. Not sure how big this one would be, though!

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TJM

02-02-2005 10:39:19




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 Re: Century welder transformer in reply to Bob, 02-02-2005 09:12:32  
What would I have to watch out for regarding unwinding/rewinding the transformer? From what the tech told me, the thermal fuse is about 3-4 windings into the transformer. How hard is this to do? I'm not affraid to try, but obviously I don't want to electrocute myself in the end. I don't really have to worry about destroying the welder because it doesn't work now. Before I invest in a new welder I'd like to see if I can salvage this one. Thanks for the help.

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Bob

02-02-2005 11:34:55




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 Re: Century welder transformer in reply to TJM, 02-02-2005 10:39:19  
If you're not familiar with electrical stuff, it would probably be a good idea to have someone who is look at it when you're done, for shorts, etc..

There is a test instrument for insulation on windings, etc., called a "MEGGER". If you know someone with one of those they could give it a complete safety test for electrical leakage.

You could use some spray electrical insulating varnish to see it up and insulate it when you're done.

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TJM

02-02-2005 12:22:02




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 Re: Century welder transformer in reply to Bob, 02-02-2005 11:34:55  
I am familiar with electronics. I am a Navy veteran and worked on F-14s. That said, I have never worked on a transformer. I know what a megger is and know how to use it. Like ScottP said, I can use varnish spray to seal up any chips/cracks in the coating. Thanks for all the helpful suggestions. I'll let you know how things work out. Who knows, maybe I can screw up the transformer enough to convince my wife I need a new welder. Darn the bad luck!

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ScottP

02-02-2005 11:06:30




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 Re: Century welder transformer in reply to TJM, 02-02-2005 10:39:19  
TJM
The main thing to watch for when you unwind and rewind the transformer is NOT cracking and chipping the varnish off the windings. This will cause a short. I would try it, you don't have anything to lose at this point. If it don't work when you are done you could always buy a new transformer or a new welder. Scott



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hay

02-02-2005 05:55:43




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 Re: Century welder transformer in reply to TJM, 02-02-2005 05:15:49  
probably the best thing is to buy a new unit. by the time u find someone 2 repair it and pay for the part and labor, it will be almost, if not, more than a new unit. that"s the trouble with everything nowadays..... ...it"s designed to be disposable. recycling and repairing in america is a joke now!



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bill b va

02-02-2005 12:22:16




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 Re: Century welder transformer in reply to hay, 02-02-2005 05:55:43  

its called planned oblosoence . that way they always have a steady sopply of suckers



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