TIG is a mode of argon arc welding with non-consumable electrode in atmosphere of protective gases. There is a tungsten electrode used as a non-consumable electrode. There are welded edges touched at welding with non-consumable electrode. The arc burns between welded piece and non-consumable electrode. Edges of the item and injecting doped material are heated up to melting, so the pool of melted metal is formed. At this the protective gas argon is supplied in arc zone; argon jet preserves melted metal against atmosphere air, oxidation and nitriding. After hardening the metal of welding pool forms welding joint.