Inconel 625 Laser Metal Deposition for Rotor Repair

This technical report discusses the application of Inconel 625 Laser Metal Deposition (LMD) on geothermal steam turbine rotors, focusing on its advantages over conventional repair methods such as High-Velocity Oxy-Fuel (HVOF) coating and Submerged Arc Welding (SAW). The document outlines the challenges faced with traditional methods, including high heat input and the associated risk of deformation, which can complicate the repair process. LMD is presented as a viable alternative that minimizes heat input, resulting in a smaller Heat Affected Zone (HAZ) and eliminating the need for Post Weld Heat Treatment (PWHT). The report details the processes involved in HVOF, SAW, and LMD, providing a comparative analysis of their effectiveness in restoring damaged rotor geometry. It highlights the potential for reduced repair times and costs, particularly in scenarios where rapid restoration is critical. The findings suggest that LMD can significantly shorten repair durations while maintaining structural integrity, making it a preferred choice for urgent repairs.