Tig with 75/25 mix

By DaveHath Date 09-18-2005 17:26

Are you just doing mild steel? I' tried it......didn't like it. I like pure argon better, seems to have a nicer arc and welds easier, but one of the others guys or gals might have a different experience

By pjseaman (**)

Date 09-18-2005 18:04

Tig should only be done with inert gasses, Argon and Helium and mixes of those. No O2 mixes and no CO2 mixes, allowed. Tig is Tungsten INERT Gas, therefore the gasses need to be inert.

By medicinehawk (**)

Date 09-19-2005 00:45

Try 92% Argon-8% Hydrogen.............Runs Hotter and keeps the bead narrow, also 98/2 same gases works almost as well.

By pjseaman (**)

Date 09-19-2005 06:39

Hydrogen? Better check that again!

By backpurge (*)

Date 09-19-2005 07:36

Argon/hydrogen mixtures are only suitable for welding austenitic steels because of the risk of hydrogen cracking in steel and porosity in ally.

That said, if you are welding austenitic stainless argon/hydrogen will give massively improved results over straight argon, these mixes are used widely over this side of the pond with argon/5% hydrogen being the most common. If you use nitrogen/10% hydrogen for back purging you will also get a far better result and use loads less gas

By MDG Custom Weld (***)

Date 09-19-2005 16:21

Yes, hydrogen mixes work well on austenitic stainless. The arc is very consistent at low amps and tends to not wander as the tungsten deteriorates. Holds a few advantages in travel speed, but helium mixtures are almost as good, with less cost.