We’re all familiar with what happens to ice when we warm it up, it melts. If we continue to warm the water until it boils it starts to quickly evaporate. Similar to water turning to steam, some of the molten metal during the welding process evaporates into the air. This metal then quickly solidifies into a very small particulate, or fume, as it cools. This is what we see rising from most weld processes.
When we’re performing Hardfacing tasks, a specific metal of concern to our health is chromium.