8 Effect of shielding gas: particulate fume8.1 Mild steel weldingMAGGenerally, shielding gases for MAG welding of mild steelare mixtures of argon and carbon dioxide or argon, carbondioxide and oxygen. Figure 8 illustrates the effect of carbondioxide in the shielding gas on fume emission rate duringmild steel welding with pulsed transfer.26.120I15.815I10IFume emission rate mg/sI258.36.3I5098% Ar/2% CO92% Ar/8% CO85% Ar/15% COCOFigure 8: The effect of welding gas formulation on fumeemission rate during pulsed MAG welding of mild steelThe high emission rate associated with the use of anAr/2%C0 mixture is attributable to the welding instabilitythat occurs with this gas. The same effect is seen in Figures9 and 10, which also show the effect of a range of shieldinggases on fume emission rate during mild steel welding withdip and spray transfer.20
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