Do I understand you right? You are using .040 mig wire to tig weld?
     >
     >       Kelly Troyer

To weld the THIN .040 thick material Kelly. You can also buy some
 very small diameter standard welding rod but what Ed is talking
about is less expensive. Good idea ED. Hope I wasn't talking
out of turn. Bill Jepson

-> WP Marsh wrote:

Gentlemen:

My 2d worth:

MIG:  Metal Inert Gas.  The wire acts as the electrode and fill metal, 
shielded by an inert gas (usually Argon/Co2).  The copper-colored 
sheen to the wire is whisper thin, and is only there to prevent oxidation (rust).

TIG:  Tungsten Inert Gas.  Current passes through a Tungsten electrode 
to the anode (the welded piece), shielded from oxidation with an inert 
gas (usually straight Argon, but formerly Helium, thus the term Heli-arc)
 while the welder manually adds appropriate fill metal.

The point is not the process, but matching alloys.  If the steel mig 
wire is of a similar alloy to the welded piece, either process is acceptable.  
Finer temperature control can be had with TIG, greater speed can be had with MIG.

wp marsh

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