From: Jason White <whitewaterssoftwareinfo@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Mon, 16 Nov 2020 04:17:36 -0800
Subject: Re: [EE] Microwave Oven Transformers
Thread-Topic: [EE] Microwave Oven Transformers
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That's really cool, thanks for sharing Bob. I look forward to seeing
the pictures. By the way, would your "lunchbox" sized welder happen to
be similar to the one that harbor freight sells? I imagine HF's "80
Amp Inverter Arc Welder" is just an imported version of the chinese
ones that can be had on Amazon for less than $90.

On Sun, Nov 15, 2020 at 10:27 PM Bob Blick <bobblick@outlook.com> wrote:
>
> Another quick update.
>
> To recap, this is a project to create a high current inductor to stabiliz=
e DC current up to about 100 Amps. I have an inexpensive lightweight lunchb=
ox-size arc welder that works great with alkaline(6013) and low-hydrogen(70=
18) welding rods, but won't sustain an arc with cellulosic(6011) rods. My t=
hought was to try adding inductance in series with the welding cables to ho=
pefully allow use of cellulosic rods.
>
> My first attempt used a stripped microwave oven transformer with 25 turns=
 of wire and a small air gap. Worked better with it than without it.
>
> I then tried using the inductor from my other arc welder, a Miller Thunde=
rbolt AC/DC. Using that inductor, the little lunchbox welder burned 6011 ro=
ds "like butter", very smooth. The inductor from the Miller was very large,=
 with a lot of turns of wire.
>
> I tore my microwave oven inductor apart and rewound it with about 52 turn=
s of wire, reusing my wire. Previously I'd used 4 strands of 12AWG wire in =
parallel, but this time I used the same wire with only 2 strands in paralle=
l. I also increased the air gap slightly.
>
> It works great, I can burn 6011 rods like nobody's business!
>
> Pictures to follow in a week or so, time permitting. Who knows about heat=
 and duty cycle, will know more as this project progresses.
>
> Cheers! Bob

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