Quote Originally Posted by sportbike View Post
Mig wire works fine for Tig. I use it when I need small diameter stainless filler. I have never noticed any difference. The AWS designation on what I have is identical to Tig filler.

What rods do you specifically use for gas welding? In the past, I just used tig rods for gas welding.
I use both 1/8 and 1/16 RG45 welding rods for mild steel. I'm using the Cobra 2000 (aka Henrob / Dillon torch). Those RG45 rods sure do not work well when tigging.

I kind of figured out the problem with the welds as I used a rod on a test piece of metal and then an autogenous weld on the same test. The autogenous weld was beautiful but the weld that had RG45 rod added was really cratered and porous.

I am of the opinion that tig welding is a very precise method of welding and that rules need to be followed. I will no longer even try to tig weld using gas rods. I am also of the opinion that gas welding is more forgiving and you can bend the rules and use tig rods.