A bit off topic - resistance welding

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