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Re: From Portugal-tungsten electrodes
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- Subject: Re: From Portugal-tungsten electrodes
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- Date: Mon, 11 Apr 2005 07:54:24 -0600
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Original poster: Luc Benard <ludev@xxxxxxxxxxxx>
Hi Jose Luis,
Just forget the carbon arc welding rod, they are tuff but they are build to
sustain the arc; in the center they are dope with a material (I don't
remember witch one) but this material is a good electron emitter when
heated, exactly the inverse of what you need for a good gap because with
that the gap will never quench. May be you could make a good gap with
plasma cutter electrode especially if you put them face to face and blow
air trough there hole, but verified the kind you have, because all the
electrode I saw for plasma cutter use a hafnium or hafnium composite (
carbide or nitride sometime with zirconium ) nucleus instead of tungsten
because at high temperature in presence of air tungsten oxide to rapidly. I
don't know how this material will behave in a gap.
English is not my natural language ether but people here seem to understand
On 10-Apr-05, at 12:43 PM, Tesla list , Fritz , )@pupman.com wrote:
Original poster: =?iso-8859-1?Q?Jos=E9?= =?iso-8859-1?Q?_Lu=EDs?=
First, thank you all for the worm welcome. I never thought that this list
was so active and had so many members. It's a good surprise.
When I first read about tesla ciols and spark gaps. the first material I
thought using for it was a Tig tungsten electrode. I'm a blacksmith and
I've been using hem for quite a while. But I also remenbered that every
time I forget to open the Argon gaz, the electrode melts instantly. But I
don't know the results without trying, tomorrow I'm going to by some
thicker electrodes, mine arre just 2mm diameter.
I also thought about using plasma cutting electrodes. they are made of
copper with a nucleum of tusgstem. The copper even has a thread in its
body so they are easily fitted. There's also carbon arc welding
electrodes. They arre used to make grooves and for cutting. I never worked
with it but I believe they withstand large currents without melting. When
I was in High school I used carbon electrodes from used 4,5v batteries to
make electric arcs using a regular AC welding machine. They didn't wear
Sorry if I took too much of your time, I should have consulted the
archives to see if this subject had already been treated, but I didn't get
the time yet and I thought the subject followed the thread of the list.
Thank you all.
Sorry for any mispelling but i'm not from a english talking country.