Weldability of microalloyed quenched and tempered steels as used in shipbuilding

U ovom radu su izneseni rezultati istraživanja provedenih na poboljšanom mikrolegiranom čeliku N-A-XTRA 70. Zavarivanje je izvedeno MAG postupkom zavarivanja, uz različite unose topline. Žarenje radi popuštanja zaostalih naprezanja izvedeno je pri 450, 550 i 650°C. Analiziran je utjecaj unesene topline za vrijeme i nakon zavarivanja na mehanička svojstva zavarenih spojeva.This paper deals with the results of research conducted on quenched and tempered microalloyed steel. The welding process applied the MAG procedure with various heat inputs. In order to relieve the residual stresses, the annealing was done at 450, 550 and 650°C. The influence of heat input and stress relieving heat treatment has been researched by testing mechanical properties