Welding Stainless Steel Shielding Gas. The nitride produced by the chemical reaction between nitrogen and stainless steel can improve the strength of the weld joint which is conducive to the improvement of the mechanical properties of the weld. MIG metal inert gas welding is a semi-automatic welding type.
Each gas has benefits and drawbacks in any given application. Pure argon is by far the most common gas for root protection of stainless steels. The shielding gas prevents weld embrittlement affects welding quality because of its influence on filler metal transfer and has a direct impact on welding costs as well.
Pure argon is by far the most common gas for root protection of stainless steels.
Gases for all types of stainless steels Welding speed Spatter control Porosity control Fusion Penetration Ease of use Thickness range mm Carbon dioxide 0 to 25 CORGON 25 0 to 25 CRONIGON 2 0 to 25 The greater the number of dots the better the gas performs. 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. MIG welding stainless steel with an Argon gas mix needs a shielding gas with a minimum of 5 to 2 of Oxygen gas in the shielding gas mix. Basic shielding gas choices for Stainless are.