Welding oxygen gas tanks are typically available in 20, 40, 80, 125 and 150 cubic feet sizes, representing the volume of the tanks. The high-pressure oxygen cylinder tanks are also available in 280 and 350 cubic feet, according to TricoWelding.Com.
Oxygen gas tanks provide welders the advantage of portability, though some of the tanks are relatively large. Welding oxygen tanks dispense compressed oxygen gas to allow combustion. This gas is combined with compressed acetylene to produce a flame that can reach temperatures of around 5,620 degrees Fahrenheit. The size of the tank does not affect the flame; only its duration. This flame not only welds, but can also cut, heat and braze metals.