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Abstract

The nickel-based alloy Inconel 617 has high strength and resistance to oxidation across a wide temperature range, making it suitable for combustion chambers, aerospace tubing and liners, land-based gas turbines, and biomedical applications. It is also used in power plant components in fossil and nuclear power plants. Comparison between Argon Gas Tungsten Arc Welding and Pulsed Laser Beam Welding on Mechanical Properties of Homogeneous Inconel 617 Joints. In this study, two welding methods - argon gas tungsten arc welding (GTAW) and pulsed laser beam welding - were performed on 1.5 mm thick Inconel 617 sheets welded in a butt joint configuration. Austenitic stainless steel 316 was also used as a filler material. The results showed superior performance of double-sided GTAW welding of the parts since double-sided welding helps reduce residual stresses from the base metal rolling and refinement of base metal grains in the welded area, improving mechanical properties and ultimate strength. In tensile testing, most samples failed at the joint location, as the residual stresses in the weld region were often compressive. Additionally, laser welding improved the mechanical properties of welded parts better than argon GTAW. It appears that the high heat input (and slow cooling rate) in argon GTAW potentially causes micro-segregation that leads to the deterioration of mechanical properties for the GTAW joint.