This study investigates the joining of SS316L and Incoloy 800 (Alloy 800) using filler (Inconel 82) metal, focusing on the joint characterization of the welded joints. The research aims to elucidate the impact of parameters on joint strength, failure behavior, and microstructural evolution. Plates of Alloy 800 and SS316L with thicknesses of 6 mm are selected for dissimilar specimens, welded in butt configuration using the GTAW process. The experimental procedure includes detailed material preparation, welding process setup, and characterization techniques such as microstructural analysis, hardness testing, and hot impact tests. Results reveal distinct microstructural differences between the base metals and welded joints, with the weld zone exhibiting finer grain size and higher hardness. Charpy impact tests were conducted at room temperature and 700 ℃ demonstrate a decrease in impact energy at elevated temperatures due to oxide inclusions.