Re: A bit off topic - resistance welding

Ian,
My mig welder is about the same voltage, but 175Amps, so 10 amps
sounds ok for this smaller guage work. You might want to search on
spotwelders to see what they use for contact points.
You may need a series 'reactor' inductor on the output to smooth
the current discharge.?. I think in this case a few heavy guage
turns around a toriod core (~>1.5" diameter,1/2 thickness? of
ferrite)
might.

I'm not an expert, just adding some ideas to the fire.

Let me know what you find. This sounds like a useful thing to have.


I've toyed with the idea of making a beefy!!! n-channel to ground
pwm pulser to make my DC mig welder power source into a smaller TIG
welder. ( with the tig cup/handle etc in addition.)

-Lee

--- In CAD_CAM_EDM_DRO@egroups.com, "Rich D." <cmsteam@a...> wrote:
> Ian,
> An Orthodontist (fits braces to teeth) has exactly what you need.
> A second hand one might be worth hunting up.
> Rich D.
>
> Ian Wright wrote:
> >
> > Hi,
> >
> > I know this is a bit off topic but I know you lot out there have
all the
> > expertise in the world!
> >
> > Does anyone have any idea whether it would be possible to make a
simple
> > resistance welding set-up for tiny jobs? Basically what I am
wanting is a
> > way of spot welding bits of watch or small clock mainspring
material
> > together - spring steel up to about 15 thou thick with welds
probably about
> > 1.64" diameter. I was thinking it might be possible using just a
big power
> > supply and capacitor like in EDM and discharge this through some
kind of
> > 'clip' but I'm not sure how to control the discharge (SCR,
Triac?)
Also I'm
> > not sure about the voltage/current needed - a 24 volt, 10 Amp
transformer
> > with a bridge rectifier and 10,000uf capacitor seems to give an
impressive
> > spark but would this be enough to weld my bits of steel or is it
only good
> > at screwdriver blades? ;o)
> >
> > Any comments would be appreciated.
> >
> > Ian
> > --
> > Ian W. Wright
> > Sheffield UK
> >
> >
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