Toxic Constituents of Welding Fumes

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Abstract
Although the main constituents of electrode coatings are known, little information exists on toxic substances present as impurities, and even less on their concentrations in arc-welding fumes. In this investigation, spectrographic and chemical analyses of the coatings of a number of electrodes in common use have been carried out. The same electrodes have also been subjected to standard welding tests and the concentrations of toxic substances in the respirable atmosphere have been measured. The results reveal that current methods for assessing welding fume hazards, based on iron oxide or total fume concentration, are unacceptable.

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