V našem članku je obravnavan TIG (Tungsten Inert Gas) postopek elektroobločnega varjenja, pri katerem električni oblok gori med volframovo elektrodo (ki se ne tali) in osnovnim materialom. Dodajni ...material se dodaja s strani (v kolikor se dodaja) pod kotom 15-20 stopinj glede na osnovni material. Oddaljenost elektrode od osnovnega materiala znaša okoli 4 mm. Električni oblok se vzpostavlja z visoko napetostjo visoke frekvence, z visokofrekvenčnim (VF) generatorjem. Oblok gori v innertnem plinu (argon ali helij). Pri nas se največ uporablja argon, ker je cenejši in ima večjo specifično težo kot helij. Zaradi tega je vžig obloka lažji in oblok je manj občutljiv na spremembe oddaljenosti volframove elektrode. Za varjenje po postopku TIG se uporabljajo varilni izvori s padajočo U-I karakteristiko. To so danes v glavnem inverterski varilni izvori.
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