Re: A bit off topic - resistance welding

Also check out Home Shop Machinist, issue March/April 1996 page 48 for
an article on a small shop butt welder. This might be able to be used
as a spot welder with some minor changes.

John Guentther

--- In CAD_CAM_EDM_DRO@egroups.com, "Robert Grauman" <rgrauman@c...>
wrote:

> The MEW issues with the bandsaw welder/spot welder article are #41

and #42.

>
> Robert Grauman in Sunny Alberta
>
> > Hello Ian,
> >
> > Model Engineers Workshop magazine described a combination bandsaw

blade

> > welder/spot welder that would appear to meet your requirements.
> > Unfortunately, I have just loaned out a stack of my MEW magazines,

and all

> I
> > can tell you is the device was described in two consecutive issues
> somewhere
> > between issue 26 and issue 56. Give me a couple of days, and I

can get

> the
> > correct issue numbers for you, if you are interested. The welder

used a

> low
> > voltage secondary as described in other postings, with a timing

device to

> > control the weld period.
> >
> > Robert Grauman in Sunny Alberta
> >
> > > 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
> >
> >