Parametric Study and Weldability Characteristics of Dissimilar Metals Cobalt Superalloy L605 and SS321 Using Fiber Laser

The article presents a thorough investigation into the parametric study and weldability characteristics of dissimilar metals Cobalt Superalloy L605 and SS321 using fiber laser welding. It discusses the growing demand for welding joints of dissimilar materials due to their improved mechanical properties and cost savings, particularly in aerospace and defense applications. The study highlights the challenges and mechanisms involved in welding dissimilar materials, including the variation in physical and chemical properties, metallurgical incompatibilities, and the influence of welding parameters on weld quality. The research employs Response Surface Methodology (RSM) to optimize laser welding parameters and conducts extensive experimental analysis, including radiographic and dye penetrant examinations, microhardness testing, and tensile property evaluations. The results reveal that the weld bead geometry and mechanical properties are significantly influenced by heat input, with the optimal parameters achieving a maximum tensile strength of 679 ± 15 MPa. The article also includes simulation studies using SYSWELD software to validate experimental findings, providing a holistic understanding of the behavior and performance of dissimilar material joints under laser welding. The comprehensive analysis and insights make this article a valuable resource for professionals in welding engineering and materials science.