MetFab - Welding Fume Handbook - Flipbook - Page 38
10 Effect of shielding gas: carbon monoxide
10.2 Stainless steel welding
MAG
Figure 32 shows the effect of various shielding gases for
welding stainless steel on the emission rate of carbon
monoxide.
The effects of formulation are very similar to those observed
in mild steel welding; that is, shielding gases containing
more carbon dioxide generate more carbon monoxide, as do
formulations containing higher concentrations of helium.
I
1.2
I
0.8
I
0.6
0.6
I
0.4
I
0.2
I
CO emission rate ml/s
1.1
1.0
0.5
0.5
Inomaxx®Plus
65%Ar/33%He/2%CO
0.4
0.1
0
98%Ar/2%CO
Inomaxx®2
23.5%Ar/75%He/1.5%CO
7.5%Ar/90%He/2.5%CO
shielding gas
Figure 32: The effect of shielding gas on carbon monoxide emission rate during
MAG welding of stainless steel with dip transfer
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