Investigation on Effects of Current and Protective Gas Combination in MAG Welding of S460MC Structural Steel

Abstract

Due to their fine-grained structure and high strength values, IS460MC steels can be employed in harsh environments, such as offshore structures. The fine-grained structure of this material, which gives it its pleasing quality, must not be damaged during the welding process in order for it to be useful. In this investigation, two different welding currents and two different Argon-CO2 ratio combinations were used to MAG welding of S460MC steel plates. The weld joints were then subjected to tensile, bending, microhardness, macro and microstructure analysis, and testing to determine the impact of the factors on the structure and mechanical characteristics of the welding. As a result of the investigations, it was seen that the increase in the welding current and the CO2 ratio caused the grain coarsening of the welding metal and the heat-affected zone. In addition, it was determined that the increase in welding current and CO2 ratio increased the hardness in these regions and decreased the yield and tensile strength.

"The impact of shielding gas composition and welding speed on weld quality in MAG welding: An experimental study "

“…The combination of lower welding parameters resulted in superior penetration, inclusion, and hardness outcomes. Kargın et al [11] conducted MAG welding of S460MC steel plates using two different welding currents and two different argon-carbon dioxide ratio combinations. The resulting weld joints were subjected to various tests, including tensile, bending, microhardness, macro, and microstructure analyses, to determine the effects of these factors on the weld's structure and mechanical properties.…”