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Re: Welding rods in static gap considered bad

Original poster: BunnyKiller <bunikllr@xxxxxxx>

Hey  Willem...

there are basically 2 different kinds of welding rods... 1: the common welding rod that is used to "fill" the material gap as it melts. and 2: the rod that is used in TIG or MIG applications... in style 2, the rod doesnt melt to fill the gap, it produces enuf heat to allow the 2 metal sections to join and sometimes is used with a "filler" rod to add metal to a wide gap. You are right to say that using style #1 rod as a gap material is not a good thing ( they are designed to get hot easily and melt) these rods are mostly an iron base material... but as in case #2 the rod in TIG/MIG applications are tungsten or tungsten/thorium ( of 2-10%) which have a very hi melt point...
and thats why we prefer that kind of "rod"

Scot D

Tesla list wrote:

Original poster: "Wim Bosma" <wbosma@xxxxxxxxxxx>

Welding rods in a linear static gap will get quite hot; much hotter than copper pipes. It should be tried only with a hefty blower, otherwise spark quenching detoriates: after a few seconds the HF output will drop. Construction of the spark cage will also be more difficult.
Regards, Willem, PA0TW

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, April 08, 2005 1:27 AM
Subject: Re: tungsten carbide magnetic?

Original poster: Lee Kohlman <lwkksw@xxxxxxxxx>

I am designing a static spark gap using 1/8" tungsten welding rods (yes, thoriated but to be used outside). I have access to phenolic fiberglass to support them. I have a total of 10 rods that I would like to lay parallel and still have some way to adjust gap length.
Of course I would love to build a SRSG but that's too involved for now. Any suggestions?

Lee K.

Original poster: BunnyKiller

but do you need that extra diameter? I am using 1/8" dia pure welding tungsten no thorium ( and you know what power Im dealing with ;) ... and have very little wear and erosion problems.. plus the minimal diameter makes it easier on disc design and dwell time...

Scott D.