Some effects of the nitrogen introduction in argon shielding gas in TIG welding of stainless steels

Rezime U slučaju austenitnih nerđajućih čelika, azot se može smatrati legirajućim elementom. Jedan od razloga je to što azot, kao intersticijski rastvoren u kristalnoj rešeci železa, doprinosi poboljšanju zateznih karakteristika, prvenstveno napona tečenja. Dodatno, zahvaljujući svom jakom austenitotvornom delovanju doprinosi povećanju stabilnosti austenita, čime je omogućena delimična supstitucija skupog i deficitarnog nikla. Legiranjem metala šava austenitnih nerđajućih čelika azotom moguće je uticati na njegove osobine. Kod postupaka zavarivanja sa gasnom zaštitom, metal šava se može legirati i putem dodavanja azota u zaštitni gas. U ovom radu su razmotreni neki od efekata dodavanja azota u argon zaštitni gas kod TIG zavarivanja austenitnog nerđajućeg čelika X5 CrNi 18 10. Abstract In the case of austenitic stainless steels, nitrogen can be considered as alloying element. One reason is that the nitrogen, interstitially dissolved in the crystal lattice of iron contributes to improved tensile properties, primarily of the yield point. In addition, thanks to its strong austenite forming action contributes to increasing the stability of austenite, thereby enabling partial substitution of expensive and scarce nickel. Alloying of the weld metal of austenitic stainless steels with nitrogen can affect its properties. In welding processes with gas protection, weld metal can also be alloyed through the addition of nitrogen in the shielding gas. This paper discusses some of the effects of the addition of nitrogen in argon shielding gas at TIG welding of austenitic stainless steel X5 CrNi 18 10.