The amount of fume produced and its content depend on the material, on the consumables, flux, or gases in addition to the process being used to weld or cut.
- the most hazardous particulate fumes include chromium, nickel, manganese, barium and zinc. The most significant component of gaseous welding fume is usually ozone
- particulate fume from cutting processes tends to be composed of oxides of elements present in the material being cut
- gaseous fume mainly consists of the oxides of nitrogen and possibly ozone
- the welding or cutting process has a marked effect on fume generation as some processes produce more than others
- the processes most likely to give significant amounts of fume include MMA, MIG, and cored wire welding, plasma and air-arc cutting
- TIG, plasma, and submerged arc welding and gas cutting