COMPARATIVE EVALUATION OF TIG-WELDED INCONEL 718 AND INCONEL 625 ALLOYS UNDER VARYING THERMAL CONDITIONS

Date

2025-11-27

Author

Arısan, Sabri Ufuk

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

119
views

0
downloads

Cite This

Inconel alloys are widely employed in critical industrial applications due to their exceptional corrosion resistance, high-temperature strength, and weldability. Among these, Inconel 718 and Inconel 625 are particularly prominent in the aerospace industry. These alloys are frequently subjected to welding under various thermal conditions, influenced by design and manufacturing requirements, which can significantly alter their mechanical behavior. This study aims to compare the mechanical properties of Inconel 718 and Inconel 625 alloys welded under different thermal conditions using Tungsten Inert Gas (TIG) welding. Inconel 718 base metal was joined with both Inconel 718 and Inconel 625 under varying heat inputs and post-weld heat treatment conditions. Tensile testing was conducted to evaluate joint strength, while dye penetrant inspection, dimensional measurements, and microstructural analyses were performed to investigate grain morphology, phase formation, distortion, and potential weld defects. Hardness measurements across the weld zones were also carried out to assess the effects of thermal cycles and post-weld treatments. The results reveal significant differences in mechanical performance depending on the combination of base materials and thermal conditions, highlighting the critical role of optimized welding parameters and heat treatments in achieving reliable weld integrity. This study offers a comprehensive comparison that contributes to material selection and process optimization for high-performance welded structures involving Inconel alloys.

Subject Keywords

Inconel, Tungsten Inert Gas, Tensile Strength, Gas Tungsten Arc Welding, Heat Treatment

URI

https://hdl.handle.net/11511/118331

Collections

Graduate School of Natural and Applied Sciences, Thesis