INFLUÊNCIA DO APORTE TÉRMICO NA CARACTERIZAÇÃO MACROESTRUTURAL DA SOLDAGEM ROBOTIZADA DO AÇO STRENX 700 MC COM O ASTM A36 UTILIZANDO ARAME METAL CORED

Abstract

This study investigated the welding of dissimilar joints between Strenx 700 and ASTM A36 steels using a robotic GMAW process in pulsed mode. Two levels of heat input, 0.8 kJ/mm and 1.2 kJ/mm, were tested, and their respective effects on the properties of the joints were analyzed. Macroscopic evaluation demonstrated the integrity of the welds, with the lower heat input resulting in greater control of the heat-affected zone, while the higher heat input favored single-pass welding. The data obtained indicate that, although higher heat input can increase productivity by reducing the number of passes, it also leads to greater thermal affectation of the material. Therefore, a correct determination of the welding parameters is essential to ensure both the quality and efficiency of the process.