Re: 1/2" tungsten roundstock?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <Rscopper-at-aol-dot-com>

David,

I just purchased 4 of these to replace the ones on the Twins that we 
destroyed at The Geek Group Teslathon last wekend - part number 020603 
Miller Electric welder - Point, Spark Gap, but they were $10 each! sold 
only in a pack of 4 (from the welder repair area at Mittler welding supply 
anyway).  At 25KW, the silver solder melted and the Tungsten fell off and 
caused the phenolic under to catch fire - what a mess.....I'll post some 
pics on www.hot-streamer-dot-com/rscopper this weekend.

R. Scott Coppersmith


In a message dated 8/5/2003 1:54:04 PM US Eastern Standard Time, 
tesla-at-pupman-dot-com writes:

>Subj: Re: 1/2" tungsten roundstock?
>Date: 8/5/2003 1:54:04 PM US Eastern Standard Time
>From: <mailto:tesla-at-pupman-dot-com>tesla-at-pupman-dot-com
>To: <mailto:tesla-at-pupman-dot-com>tesla-at-pupman-dot-com
>Sent from the Internet
>
>
>
>Original poster: "john by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
><jsturgeo-at-tampabay.rr-dot-com>
>
>David, You can get tungstens with a 3/8" face that are silver brazed to 1/2"
>Mild steel. I have a Miller 350 syncrowave TIG welder and these are for the
>spark gap for the high frequency unit used in welding aluminium. I don`t
>have a part number but these are available at any welding supply under the
>name "Spark Gap Points". They may vary some between manufactures, Miller,
>Lincoln, Airco and Hobart. I changed the ones in my welder about 5 years ago
>and the cost was about 3 bucks each, (4 required). Best regards, John
>Sturgeon
>----- Original Message -----
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Tuesday, August 05, 2003 9:56 AM
>Subject: 1/2" tungsten roundstock?
>
>
> >Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>"
><Tesla729-at-cs-dot-com>
> >
> >Hi all,
> >
> >I am in the process of rebuilding my coil system and
> >have built a SRSG with G-10 and will be using tungsten
> >electrodes. I have been considering 1/4" tungsten elec-
> >trodes since that's the largest diametered size available
> >from a welders supply but I was wondering if I should
> >even consider 1/2" diameter tungsten since I plan on
> >running at about 10 kVA? If I should get that large
> >of dia. tungsten for electrodes, where would I aquire it
> >at this size? Would the 1/4" tungsten be large enough
> >for the relatively short runs that most coilers do?
> >
> >Also, I have noticed some RSGs where tungsten tips
> >were somehow affixed to a stud of another type of
> >metal like brass, and I was wondering how tungsten is
> >brazed to another type of metal?
> >
> >Thanks,
> >David Rieben
> >
> >
> >