2018, vol. 63, br. 1, str. 29-35
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Zavarivanje dupleks čelika - pregled sadašnjih preporuka
Welding duplex stainless steels: A review of current recommendations
Sažetak
Čelik neće postati široko prihvaćen i iskorišćen, ako se ne može uspešno zavariti bez previše ograničenja. Savremeni dupleks nerđajući čelici ispunjavaju ove zahteve uz određene razlike zavisno od klase. Porodica dupleks nerđajućih čelika, tokom poslednje decenije, proširena je novim klasama i nedavno visoko-legiranim hiperdupleksima. Većina preporuka za zavarivanje je veoma slična onima iz devedesetih. Međutim, uvođenje novih klasa i povećana upotreba novih metoda zavarivanja donekle je promenila percepciju onoga što je moguće. Ovaj rad govori o najsavremenijim trendovima u zavarivanju dupleks nerđajućih čelika. Zasnovan je na inputima iz svetske zavarivačke asocijacije, uključujući korisnike i proizvođače čelika i potrošnog materijala za zavarivanje, kao i literaturu. U većini slučajeva postoji konsenzus o preporukama, ali varijacije koje odražavaju razlike u praksi postoje, posebno za nove kategorije čelika gde su granice, npr. dozvoljeni unosi toplote manje dokumentovani.
Abstract
A steel will not become widely accepted and used unless it can be successfully welded without too many limitations. Contemporary duplex stainless steel grades fulfill these requirements with some grade dependent differences. The duplex stainless steel family has, during the last decade, been extended with new lean grades and recently also highly-alloyed hyperduplex grades. Most welding recommendations are very similar to those of the 1990's. However, the introduction of new grades and the increased use of newer welding methods has somewhat changed the perception of what is possible. This paper discusses the state-of-the-art and trends in welding of duplex stainless steels. It is based on input from the worldwide welding community, including users and producers of steel and welding consumables as well as literature. In most cases, there is consensus on recommendations but variations reflecting differences in practices exist in particular for newer steel grades where limits in e.g. allowable energy inputs are less well documented.
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