Tungsten electrode resistance (was Coil Meeting...)

["Lau, Gary" <Gary.Lau-at-compaq-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

To further split hairs, I believe the difference in resistivity between
tungsten and anything else in an RSG electrode is totally insignificant.
The IR losses through a 1/8" diameter by 1" length of any metal will be
nothing compared with the heating generated by the arcing.

Gary Lau
Waltham, MA USA

		-----Original Message-----
		From:	Tesla List [mailto:tesla-at-pupman-dot-com]
		Sent:	Tuesday, June 29, 1999 7:28 AM
		To:	tesla-at-pupman-dot-com
		Subject:	Re: Coil Meeting...

		Original Poster: Chip Atkinson <chip-at-pupman-dot-com> 

		Just to split hairs, the welding rods are tungsten _metal_,
not the
		carbide.  The welding rods are for TIG welding and have to
conduct
		electricity through them so that an arc can be created
between the
		workpiece and the welding torch.

		Chip

	
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
		Chip Atkinson 
		http://www.pupman-dot-com 
		--- If I can't fix it, I can fix it so it can't be fixed --
	
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

		On Mon, 28 Jun 1999, Tesla List wrote:

		> Original Poster: Finn Hammer <f-hammer-at-post5.tele.dk> 
		> 
		> Tesla List skrev:
		> > 
		> > Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
		> 
		> snip
		> 
		> > I wonder if the tungsten has a higher resistance that
causes
		> > extra heating?
		> 
		> I asked the chief metallurgist at "Danit", a danish sinter
metal
		> factory, about this recently, He said the conductivity of
Tungsten
		> carbides is in the range of 1/10 to that of copper.
		> 
		> I take that as an argument for brazing short pieces of the
welding rod
		> to copper sticks, and then have them machined afterwards.
		> 
		> Cheers, Finn
		> 
		> A very big snip :-)
		> > 
		> >         Terry
		> 
		>