Characterization of Macro/Microstructure and Corrosion Resistance of Austenitic Gas Tungsten Arc Welding Cladding

Developing surface coatings to enhance material properties is crucial in modern industry. Cladding, where a superior material is applied to a base metal, is one effective approach. This study investigates the macro and microstructural features, as well as corrosion and wear resistance, of super austenitic stainless steel cladding on carbon steel via gas tungsten arc welding. It emphasizes how welding parameters, especially travel speed, affect the process. Carbon steel plates served as the base, with AWS A5.9 filler used for cladding. Three travel speeds were tested to observe their impact on dilution ratio, microstructure, and mechanical properties. The research included welding, metallographic preparation, microhardness testing, electrochemical corrosion testing, and wear testing. Results indicated that lower travel speeds improved the dilution ratio and, consequently, the properties of the clad layer. The heat-affected zone presented a two-phase microstructure with dendritic austenite and δ-ferrite. The cladding layer's hardness exceeded that of the base metal, with minimal variation across different travel speeds. Overall, the clad layers showed significant improvements in wear and corrosion resistance. The clad layer exhibited a strong metallurgical bond in the cladding.