MetFab - Welding Fume Handbook - Flipbook - Page 35
10 Effect of shielding gas: carbon monoxide
10.1 Mild steel welding
MAG
Carbon monoxide can be formed by the breakdown of carbon
dioxide, so shielding gases containing high concentrations of
carbon dioxide might be expected to generate more carbon
monoxide.
2.0
I
1.5
I
1.0
I
CO emission rate ml/s
Figures 27 and 28 show the effect of a number of shielding
gases used for MAG welding of mild steel on the emission
rate of carbon monoxide.
1.6
0.7
0.9
0.8
I
0.5
1.7
0.1
0
95%Ar/5%CO
Inomaxx®2
93%Ar/5%CO/2%O
Ferromaxx®7
82%Ar/8%CO
Ferromaxx®15
shielding gas
Figure 28: The effect of shielding gas on carbon monoxide emission rate
during MAG welding of mild steel with dip transfer
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