Contrasting the mechanical and metallurgical properties of laser welded and gas tungsten arc welded S500MC steel

Abstract S500MC steel is a grade of high-strength low-alloy (HSLA) which widely used in the automotive industry and for agricultural machinery equipment. Considering properties this alloy, selection welding process parameters becomes essential to ensure that HSLA assemblies meet specific service requirements. In work, mechanical metallurgical produced by autogenous laser beam (LBW) automatic gas tungsten arc (GTAW) were compared. Tensile testing, metallography, hardness fractographic analysis performed on welded specimens, revealing heat input these processes caused significant microstructural changes within joints. LBW samples, about 10 times lower than GTAW finer microstructure, narrower fusion zone width, smaller heat-affected zone. All fractures specimens occurred base metal, while all weld zone, both regardless input. joints exhibited higher (even those obtained metal) as compared