Lamp gas
fluorescent bulbs
Geiger counters, lasers
Inerte welding gas

Argon is mainly used in welding and in other operations that demand a non-oxidizing atmosphere without nitrogen. Since 1920 it is used in the filling of electrical lamps, in order to reduce the evaporation speed of the tungsten filament and, more recently, in thermal-ionic tubes "thyratons" and in fluorescent lamps.