I have a fresh bottle of C25 gas. My girlfriend has a small stainless project for me to weld. Is Tri-mix gas a must for stainless, or can I get away with the C25?
Thanks for all the replies.
I got this off the Lincoln website: "The shielding gas recommended for short-circuiting welding of stainless-steel contains 90% helium, 7.5% argon, and 2.5% carbon dioxide. The gas gives the most desirable bead contour while keeping the CO2 level low enough so that it does not influence the corrosion resistance of the metal. High inductance in the output is beneficial when using this gas mixture.
Single-pass welds may also be made by using argon-CO2 gas. The CO2 in the shielding gas will affect the corrosion resistance of multipass welds made with short-circuiting transfer."
"Gases for pulsed arc welding are argon plus 1% oxygen, the same as used for spray arc welding."