12 Recommended gases12.2 Stainless steel weldingMIGlnomaxx® Plus is the optimum gas forwelding all thicknesses of stainlesssteels and is particularly beneficialwhen high deposition rates are required.lnomaxx® 2 is also recommended forwelding all thicknesses of stainless.EnvironmentalNone of the shielding gases normallyused for welding stainless steels offerssignificant advantages in reducingparticulate fume emissions.A shielding gas containing 98%argon/2% oxygen provides lowerexposure to ozone than any of theother gases when using both pulsedand spray transfer. However, lnomaxx®Plus offers higher productivity withoutconsiderably increasing exposure toozone.The overall preference is therefore forlnomaxx® Plus.with carbon dioxide, but exposure toozone is not expected to present a majorproblem during FCAW of stainless steel.TIGlnomaxx® TIG is recommendedfor welding austenitic stainlesssteels. Argon or Alumaxx® Plus arerecommended for welding ferriticstainless steels.EnvironmentalTIG welding generates only minimalamounts of particulate fume. Reducedfume generation is therefore not aconsideration for choosing a shieldinggas for TIG welding.Argon/helium mixtures (Alumaxx®Plus) and shielding gases containingsmall amounts of hydrogen (lnomaxx®TIG) offer reduced ozone emissions,making them the preferred gasesenvironmentally as well as in terms ofwelding characteristics.FCAW80% argon/20% co, is the recommendedgas mixture for all applications.EnvironmentalAt their optimum welding condition,carbon dioxide, 80% argon/20% CO, andan experimental mixture containing35%Ar/50%He/15%CO, all have verysimilar particulate fume emission rates.However, the experimental mixtureprovides superior fume reducingproperties over a range of weldingconditions, and is thereforerecommended. More ozone is generatedwhen welding with this mixture than43
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