MetFab - Welding Fume Handbook - Flipbook - Page 30
0.30
I
0.25
I
0.20
I
0.15
I
0.10
I
0.5
I
Fume emission rate mg/s
9 Effect of shielding gas: ozone
Ozone OES (15 minute reference period)
0.03
0.03
0.01
0
80% Ar/20% CO
CO
35% Ar/50% He/15% CO
shielding gas
Figure 21: The effect of shielding gas on average exposure
to ozone during FCAW of mild steel with a 33% duty cycle
9.2 Stainless steel welding
MAG
Shielding gases for MAG welding of stainless steel are
typically mixtures of argon with small amounts of oxygen
(
