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2018, vol. 63, br. 2, str. 65-78
Zavarivanje dupleks čelika - pregled sadašnjih preporuka
ESAB AB, Göteborg, Sweden

e-adresaleif.karlsson@esab.se
Sažetak
Preporuke su zavisne od klase, ali se u okviru svake grupe vrlo malo razlikuju uz neke izuzetke. Dva glavna zapažanja su: 1) niža maksimalna energija luka je dopuštena za više visoko-legirane i 2) niža minimalna energija luka koja se primjenjuje za klase sa više azota. Takođe se može primetiti da postoji manje saglasnosti sa preporukama za novije klase u odnosu na starije- bolje uspostavljene. Nedavna klasa 24% Cr LDX 2404 nije obuhvaćena upitnikom i posledično nije navedena u tabelama 2 i 3. Podaci proizvođača ukazuju na sličnu zavarljivost kao i kod drugih visoko azotnih klasa sa nižim i srednjim sadržajem legurajućih elemenata i upotrebom potrošnog materijala tipa 2209. Kada se preporuke razlikuju između izvora, uključene su gornje i niže vrednosti. Specifični komentari o klasama su uključeni gde je to prikladno. Međuslojne temperature i energija luka, i više i niže od onih navedenih u Tabeli 2, ponekad se koriste tamo gde se primjenjuje rastvarajuće žarenje nakon zavarivanja. Predgrevanje se obično ne preporučuje. Međutim, ako se zavarivanje vrši na temperaturama nižim od sobne temperature, preporučljivo je da se zagreje do 50-80°C kako bi se obezbedile površine spoja bez vlage. U retkim slučajevima, predgrevanje do maksimalno 150°C koristi se da bi se smanjio rizik od prslina pri zavarivanju debelih i / ili jako uklještenih radnih komada sa niskom energijom luka kako bi se smanjile brzine hlađenja i nivoi napona.
Reference
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O članku

jezik rada: engleski, srpski
vrsta rada: izvorni naučni članak
DOI: 10.5937/zzk1802065K
objavljen u SCIndeksu: 13.07.2018.

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