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The present work is part of a research program that aims to evaluate the technical feasibility of increasing productivity in\udthe manufacturing of tubular components for offshore oil industry, which are fully welded by automatic submerged arc welding\udprocess, with high heat input, but with no impairment on the impact toughness of the weld metal. Multipass welds were produced\udby the submerged arc welding process, with a combination of F7A4-EM12K (wire/flux), by using a 3.2 mm-diameter wire,\udpreheating at 80°C, with direct current, in flat position, with heat input varying from 3.5 kJ/mm to 12 kJ/mm. After welding, tensile\udtests and Charpy-V impact tests at –60°C, –40°C, –20°C, 0°C and 20°C were carried out, as well as metallographic examination\udby both optical (OM) and scanning electron microscopy (SEM), of specimens obtained entirely from the weld metal, allowing the\uddiscussion over the toughness X microstructure relationship. The weld metals have shown higher toughness levels in relation to\udthe minimum required for use with low-alloy C-Mn steels welding with requirements of impact toughness of 27 J at 0°C for heat\udinput up to 12 kJ/mm allowing an increase in productivity of 58% on the effective manufacturing time

ESTUDO DO APORTE TÉRMICO NAS PROPRIEDADES MECÂNICAS DE METAIS DE SOLDA DE AÇO C-Mn OBTIDOS PELO PROCESSO ARCO SUBMERSO