Carbon Monoxide Hazard in the CO2 ARC-Welding Processs

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Abstract
A survey of the carboxyhaemoglobin levels of welders using the bare-wire dip-transfer carbon dioxide shielded welding process was performed to see whether excessive amounts of carbon monoxide were being absorbed by the operators. It was found that there was a possible hazard from carbon monoxide unless great attention was paid to the standard of ventilation. If the general ventilation was defective then local exhaust ventilation was shown to be necessary. In one area surveyed a dramatic fall in carboxyhaemoglobin levels was noticed after improvements were made in the general ventilation and local exhaust ventilation installed. An effective means of local exhaust ventilation for use on both fixed jigs and moving conveyor systems is discussed.

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