TIG Welding FumeUnder normal circumstances TIG welding aluminium produces very little particulate fume, because filler metal is not transferred across the arc but added to a molten pool of weld metal. Ozone, however, may be generated during TIG welding, but oxides of nitrogen tend to be produced only in low amounts. In general terms, TIG welding with filler addition tends to produce more ozone than autogenous TIG welding, TIG welding with argon shielding gas tends to give more ozone than use of helium rich gas mixtures, and high currents give more ozone than low current. Where ozone is produced in significant amounts, welders and others should be protected from exposure by use of suitable respiratory protection. Use of local fume extraction is not usually effective in removal of ozone due to the fact that it can be formed at some distance from the arc.
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