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This article discusses the classification and differences of welding shielding gases used in the welding industry. The broad classification consists of Active and Inert gases. Active gas reacts with the weld pool and/or the melting drop of the wire, so taking an active part in the process as well as protecting the weld pool from the outside atmosphere. Inert shielding gases do not react actively with the weld pool, and they protect the pool from the atmosphere.