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From: "John Jardine"
Subject: Re: welding a transformer core
Date: Mon, 16 Dec 2002 13:03:27 -0000
NNTP-Posting-Date: 16 Dec 2002 12:50:43 GMT
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Viktor Mikhailovich Polesov wrote in message
> I milled out the welds of a salvaged microwave oven transformer to
> disassemble the core to get the secondary wiring out, in order to
> rewire it with a heavy gauge wire. This is a laminate core
> transformer, with the core made of many small sheets of what appears
> to be laminated stainless steel stacked and welded together. I
> suppose if I had been more stubborn I could have gotten the secondary
> out without disassembling the core, but I'm impatient. Even still it
> was a huge pain and even after disassembling the core, I still had to
> resort to hack-sawing the secondary wiring.
> So now I have a transformer core that I need to weld back together.
> Can anyone say for certain if stainless is commonly used here, and if
> so should I use MIG or TIG to put it back together? Heat dissipation
> while welding is a concern, because I used insulated wiring in the new
> secordary as opposed to enameled wire. I don't want to melt the
> insulation during the welding. I suppose I would be better off with
> TIG in this regard, no?
> I'm working on making a spot welder of the sort described here:
> The owner of this web page does not discuss inductive effects. Aren't
> you in danger of frying the primary-side SCR without some provisions
> in this area?
Can't see the lams being stainless steel. Would have assumed normal silicon
steel. Just run a Mig weld using steel wire across the laminations like in
the original. Or, drill through and put a nut and bolt in,
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