Helium mix is what they recomend for welding stainless.
I have a small job of welding a crack in a stainless steel
manifold and will use my Miller 180 with SS wire but I have argon
mix only. Will it work? Never tried welding stainless.
What's the scoop here?
I used a C25 (75%argon -25% CO2) on stainless before I decided to fork
out some $$ for a new bottle and trimix 90%helium- 7.5%argon- 2.5%
this try-mix is needed for shortcircuit stainless MIG. with 304 and
you can use C25 but your weld bead will be more domed, and it will not
flow (wet-in) in as nice as it would with trimix.
also your weld bead will have a gray-ish look , and you will have more
more domed bead,
not wetting /flowing into the base
gray looking bead
if you can live with it it will do the job.
also keep in mind they sell selfshielding stainlesswire which was
designed to be used with C25.