Bob Engelhardt wrote in
:

On 10/17/2014 11:16 AM, wrote:

I have seen spot welders made from MOTs. A nice one on youtube is
from the "King of Random." It looks nice and works well. I am
planning to run two MOTs in parallel on 240 volts for higher power
and faster welding time. Please be careful when messing around with
MOTs. The high voltage side can cause nasty burns or even kill you.

My MOT spotwelder:

http://www.mwdropbox.com/dropbox/MOT...rPrintable.pdf

There's an easier way to build one of these provided the transformers are
very similar. Line up the transformers so you can see straight through
the apertures the seconaries were removed from and use a one turn winding
through both cores, which can simply be a U shaped piece of aluminium or
copper. This puts the secondaries in series so they no longer need to be
two turn. If the output voltage is negligable, one of the primaries
needs to be reversed.

I would suggest varnish soaked cartridge paper as insulation where the
winding goes through each core. Paint alone is a bit risky on the
corners.


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Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED)
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