Shielding Gas Considerations for Aufhauser Corporation Solid Stainless Steel Cut Lengths and Spooled Wires

GTAW (TIG) - Argon is suggested for thickness up to approximately 1/2". For thicker sections, argon-helium mixtures or pure helium may be used for deeper penetration. Argon-hydrogen mixtures are occasionally used to improve bead shape and wetability.

GMAW (MIG), Spray Transfer - 99% argon - 1% oxygen is predominantly used. This mixture improves arc stability; produces a more fluid and controllable weld puddle with good bead contour. Undercutting is minimized on heavier sections. 98% argon - 2% oxygen provides better arc stability and welding speed than the 1% oxygen mixture for thinner stainless steel materials.

GMAW (MIG), Short Circulating Transfer - 90% helium + 7.5% argon + 2.5% CO₂ has no effect on corrosion resistance; provides small heat-affected zone; no undercutting; and minimum distortion.

300 Series Stainless Steel GMA (MIG) Welding Parameters