Effect of post-weld heat treatment on the microstructure and mechanical properties of CWW GMAW

Abstract

This study aims to investigate the impact of heat treatment on the microstructure and welding properties of cable-type welding wire gas metal arc welding (GMAW) in shipping steel. In contrast to the untreated weld, the width of the heat-affected zone of the weld after heat treatment decreased. The microstructure of welded joints following heat treatment and air cooling is relatively and finer compared to the grain structure after furnace cooling and without heat treatment. The tensile strength of welded joints decreases compared to that of untreated weld, while it is higher than that of joints after heat treatment and furnace cooling. The impact toughness of heat treatment is higher than that of the weld seam, heat-affected zone, and fusion line without heating treatment, and the impact performance is higher than that of post-weld heat treatment with furnace cooling.