Mechanical behavior of high strength S690-QT steel welded sections with various heat input energy

It was shown that in almost all coupons of the welded sections tested in the present study, fracture occurred within the heat affected zones of the welded sections without any failure in neither the weld metal nor the base plates. For welded sections prepared with a line heat input energy equal to 1.0 kJ/mm, there was almost no reduction in the mechanical properties of the welded sections. However, for those welded sections prepared with a line heat input energy equal to 5.0 kJ/mm, only 70% of the yield strength of the base plates was attained. Consequently, the effects of welding onto the mechanical properties of the S690-QT steel welded sections have been successfully quantified, and the information is readily adopted in assessing their mechanical behaviour according to various line heat input energy employed during welding.