Argon is an odourless and colourless gas and is chemically inert; indeed it is referred to as one of the noble gases.
Argon is used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily non-reactive substances become reactive. Its purpose is to protect the weld area from atmospheric gases, such as oxygen, nitrogen, and water vapour. Depending on the materials being welded, these atmospheric gases can reduce the quality of the weld or make the welding more difficult.
