M
mike
- Jan 1, 1970
- 0
Steve said:mike wrote:
Hi Mike,
We needed to weld some exotic metals, that required CD welding. Our
welder was built in a glove box, The electrode construction was similar
to your, we modified a toggle clamp to do the job with 1/16" diameter tips.
The cap- bank was around 2200uF (10 x 220uF 400V reservoir caps) Energy
supply was a large variable O/P PSU, large because thats what we have
around. Drive was 0-400V. Welding occured at around 40V.
Discharge was effected by a very large old automobile relay , with
contacts bigger than US pennies (around 1" - like the old UK pennies)
Thanks for the info. I was never successfull trying to switch the weld
current. Welded a lot of contacts, but no battery tabs ;-)
Typical CD system discharges more volts into a step-down transformer.
mike
Job was pinched in the jaws of the spotter, then the hands had to
operate two buttons simultaneously to activate the spot.
Yes, I'd have preferred to use a huge ignitron, or a hockey-puck
thyristor, but we didn't have time - this was a two day
oh-god-we-have-to-do-this-yesterday kind of thing.
We just about managed to weld molybdenum foil ~0.2mm thick, with it.
Steve
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