8 Effect of shielding gas: particulate fumeTIGShielding gases for TIG welding stainless steel are usuallypure argon, pure helium, argon/helium mixtures or argonwith small additions of hydrogen or nitric oxide. The last twotypes are formulated especially to reduce ozone generation,and this aspect is discussed below.Shielding gas composition does affect fume emission rate, asFigure 14 shows, but the amounts of fume generated are sosmall as to make emission rate data insignificant.0.130.12I0.09I0.06I0.03IFume emission rate mg/sI0.150.080.090.090.070ArgonAlumaxx® Plus25% Ar/75% He96% Ar/2% H95% Ar/5% Hshielding gasFigure 14: The effect of shielding gas on fume emission rateduring TIG welding of austenitic stainless steel24
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