Abstract
To study the effect of Al in 50 kgf/mm2 class C-Mn-Nb steels on weld metal microstructure and toughness, single-pass, bead-in-groove tandem submerged-arc weld metals have been made at 49 kJ/cm. The work was based on a 1.5%Mn-0.5%Mo wire, with two kinds of highly basic agglomerated fluxes and one low basicity, flux. Semikilled, Si-killed and Si-killed, Al treated plates of 25 mm thickness were employed.The preliminary findings presented in the report showed that even small changes in weld metal Si and Al levels (e.g. 0.02 to 0.03% Al) could produce drastic deterioration in Charpy toughness (up to 100 deg C shift in 3.5 kgf⋅m temperature) when using some basic fluxes. Furthermore, the results indicated that achievement of high weld metal toughness with some basic fluxes might be difficult in high dilution welding of Si-killed, Al-treated steels having more than about 0.035-0.045% Al. The effect of Al on microstructure and toughness was found to be independent of its source (wire or plate).
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