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Aero-engine applications require welded Ni-based super alloys at various parts that are eventually subjected to creep loading at elevated temperatures. It is essential to know the mechanical behavior and weldability in detail. A prerequisite in this case is the evolution of residual strain and internal stresses induced by welding during subsequent straining at room temperature. In order to compare the strain partitioning in manually welded IN718 sheets, a detailed analysis based on the digital image correlation (DIC) method has been done. Manual welding has several limitations, such as a nonlinear weld track, uneven thickness of the weld pool, weld buckling, and huge distortions. Strain evolution in and around the welded region has been mapped for different strain rates and has been studied thoroughly from the viewpoint of strain partitioning. The evolution of residual strain due to welding in various parts of a weld can be correlated with the differential strain accumulation during straining, and finally, this accumulated strain determines the failure location of the weld.

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Strain Mapping and Stress Analysis of TIG Welded Joints of IN718 Superalloy

  • 会议论文

  • 发表日期：

    2025年

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  • C. Nikhil Kumar,
  • K. Nagaraju,
  • Kaustav Barat,
  • Vijay Petley,
  • K. Venkateswarlu,
  • Siva Subbarao Patange

摘要

Aero-engine applications require welded Ni-based super alloys at various parts that are eventually subjected to creep loading at elevated temperatures. It is essential to know the mechanical behavior and weldability in detail. A prerequisite in this case is the evolution of residual strain and internal stresses induced by welding during subsequent straining at room temperature. In order to compare the strain partitioning in manually welded IN718 sheets, a detailed analysis based on the digital image correlation (DIC) method has been done. Manual welding has several limitations, such as a nonlinear weld track, uneven thickness of the weld pool, weld buckling, and huge distortions. Strain evolution in and around the welded region has been mapped for different strain rates and has been studied thoroughly from the viewpoint of strain partitioning. The evolution of residual strain due to welding in various parts of a weld can be correlated with the differential strain accumulation during straining, and finally, this accumulated strain determines the failure location of the weld.