10.3 Calculating exposure from emission ratesFigures 28-32 show carbon monoxide in terms of generationrates, not exposure levels. This is a problem in that it isdifficult to predict exposure levels from emission rates; allthat we can say for certain is that for an identical worksituation, a welding process with a higher carbon monoxideemission rate will expose the welder to higher concentrationsof the gas.We can, however, compare measured emission rates andexposures for certain welding conditions (Figure 33).I60I40I30I20I10IExposure ml/sCO exposure standard500I2I4I6I8I10I12CO emission rate ml/sFigure 33: The effect of CO emission rate on exposure to carbonmonoxide. Flat welding, open workshop, 33% duty cycleFigure 33 shows that exposure to carbon monoxide is onlylikely to be a problem if the emission rate is above 1Oml/s. Inpractice, this means that MAG welding with a carbon dioxideshielding gas and spray transfer, or FCAW with a carbondioxide shielding gas, may present problems with carbonmonoxide.39
It seems that your browser's pop-up blocker has prevented us from opening a new window/tab. Please click the button below to open the link manually.
Unfortunately an error occurred - please try again.
