AWS- CAWF Characterization of Arc Welding Fumes

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AWS- CAWF Characterization of Arc Welding Fumes

Six welding fumes, representing a variety of welding rods and wires, were analyzed for particle size and chemistry by X-ray diffraction, energy dispersive X-ray analysis, scanning transmission electron microscope, and automated electron beam analysis. Four carbon steel fumes (E6010, E7018, E70S-3, E70T-1), a stainless steel fume (E308-16) and an aluminum fume (E5356) were tested. It was found that particle average diameters are all in the respirable range â?? between 0.1 and 1.0 µM. Few individual particles were greater than 1 µM, but STEM pictures revealed many particles as small as 0.01 µM. The particles appeared to be spheres or clusters of spheres. Even though no crystalline features were observed, all particles examined produced electron diffraction patterns, indicating that they contained crystalline material. There was no correlation between average diameter and particle chemistry or between average diameter and fume type. An analysis of particle chemistry indicates that the potential toxicity of the fumes does vary appreciably. ISBN 087171-229-6

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