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Re: [TCML] DUMB QUESTION OF THE DAY



Ed,
     The easiest way is to copper plate them, I have copper plated many 
coins, they plate well.  As for the tungsten I am told it is very 
possible, others on the list will verify.  Use distilled water, copper 
sulfate, a little sulfuric acid and a tiny bit of ammonia.  Add a very 
small pinch of sodium carbonate if you wish.  3-12 volts DC, the cathode 
hooks up to the coin, the anode is a copper wire.  If you cannot get 
copper sulfate immediately, magnesium sulfate will work just fine if you 
let it go a while to get rid of the magnesium and turn the solution 
blue.  When you get a decent layer, soldering should be easy.  You could 
also tap a hole in the dime, and put threads on your tungsten, but that 
would mean actual work.  you could also try soldering them as is, maybe 
it is not that hard (just use flux).  Let me know how it goes.

Scott Bogard.

Ed Phillips wrote:
>    I have an application in which I'd like to be able to SOFT SOLDER a 
> short piece of 0.050" tungsten wire to the rim of a dime.  This is for 
> a spark gap which will never get warm but where I need to prevent 
> erosion of the silver such as I'm getting now.  I've tried a Google 
> search and found hints, but only hints, that it may be possible.  I 
> could copper plate the stuff I think but not sure and also not sure if 
> that would make it solderable.  I could also, with a lot of work, tin 
> it with silver solder but that's by far the method of last resort.
>
>    Might also be possible to spot weld it?  Doesn't matter, don't have 
> the equipment.
>
> Thanks,
>
> Ed
>
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