10 Effect of shielding gas: carbon monoxide10.1 Mild steel weldingMAGCarbon monoxide can be formed by the breakdown of carbondioxide, so shielding gases containing high concentrations ofcarbon dioxide might be expected to generate more carbonmonoxide.2.0I1.5I1.0ICO emission rate ml/sFigures 27 and 28 show the effect of a number of shieldinggases used for MAG welding of mild steel on the emissionrate of carbon monoxide.1.60.70.90.8I0.51.70.1095%Ar/5%COInomaxx®293%Ar/5%CO/2%OFerromaxx®782%Ar/8%COFerromaxx®15shielding gasFigure 28: The effect of shielding gas on carbon monoxide emission rateduring MAG welding of mild steel with dip transfer35
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