Argon. The noble favourite among the inert gases.

The characteristics are what make the most common inert gas so unique: Argon reacts very sluggishly and hardly reacts with other elements or compounds. This characteristic of sluggish reaction makes it the favourite among the inert gases – as for instance used to weld aluminium alloys or high-alloy steels. Furthermore, it is used in metallurgy as inert gas, for instance for the production of titanium, ultra pure silicon or in melting refinery and the degassing of metal melt.