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Re: From Portugal-tungsten electrodes

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 that ;-)


Luc Benard

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?= <jose-luis@xxxxxxx>


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 out easily.
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.

Jose Luis