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From: "Henry Kolesnik"
Subject: Re: welding a transformer core
Date: Wed, 18 Dec 2002 17:04:33 -0600
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Thanks to Barry for testing and disproving the BS about a transformer frying
itself because of no load. The explanations John Woodgate made were not
understandable by me and Iuse to be an engineer. I've fried many a
transformer but none that weren't loaded!
"Barry Lennox" wrote in message
> Sounds like some serious BS here. This seemed wierd as I have been
> using a rewound MOT for a welder, and it spends a fair amount of it's
> time with no or an insignificant load on it. I had never noticed any
> "frying" tendencies.
> Anyway as a sanity check, I took another at random (I have a very
> large pile of these, SWMBO reckons another microwave coming in the
> door will sink the house!) and ran it for 15 mins with no load and
> there is no significant heating that I can detect. When can I expect
> the frying?
> I then run some horribly crude random welds (3mm E6013 at 120 Amps)
> over the original one, Guess what, it spotwelds just the same and
> still has not fried, or got even lukewarm.
> Don't have any idea what it's characteristics are, but it's got a
> Mitsubishi logo on it, and the text A600 476JP 8N 220 it that means
> anything to anybody. It's about 3 x 3.5 x 4 inches.
> Barry Lennox
> PS Sounds a bit like an old tutor used to tell me: "Those who say it
> can't be done, should get out of the way of those doing it!!"
> On 17 Dec 2002 05:37:12 -0800, firstname.lastname@example.org (N. Thornton) wrote:
> >email@example.com (Viktor Mikhailovich Polesov) wrote in message
> >> There seems to be a bit of debate as to welding the core. If it is
> >> going to cause a huge loss in efficiency, why isn't that the case with
> >> the original weld?
> >Microwave transformers are inefficient. Run one with no load and no
> >fan and it'll be fried in minutes.
> >Regards, NT
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