Comparative Analysis of Mechanical Properties of Inconel and Martensitic Stainless Steel Joints Achieved by Tungsten Inert Gas Welding

  • A. Ramaswamy Department of Mechanical Engineering, Sasi Institute of Technology and Engineering, Tadepalligudem, India https://orcid.org/0000-0002-6258-3227
  • G. Ashok Department of Mechanical Engineering, Sasi Institute of Technology and Engineering, Tadepalligudem, India
  • B. Prasanna Nagasai Centre for Sustainable Materials and Surface Metamorphosis, Department of Mechanical Engineering, Chennai Institute of Technology, India
DOI: https://doi.org/10.35219/awet.2025.14
Keywords: TIG welding, Vickers microhardness, martensitic stainless steel, tensile, Inconel

Abstract

This work provides a detailed comparative study on the mechanical performance and microstructural features of dissimilar joints produced by Tungsten Inert Gas (TIG) welding between Inconel 718 and AISI 410 martensitic stainless steel. Welding was performed on 2 mm thick sheets of both alloys using optimized conditions: 80 A current, 12.1 V voltage, 60 cm/min travel speed. Microstructural evaluation revealed contrasting solidification patterns, with Inconel 718 exhibiting Laves phase precipitation within dendritic networks, while AISI 410 displayed coarse dendrites interspersed with sulfur-based inclusions. Vickers microhardness analysis indicated a non-uniform distribution across the weldment. The highest hardness (410 HV) occurred in the AISI 410 heat-affected zone (HAZ) due to martensitic transformation, whereas the Inconel 718 base metal and fusion zone recorded 267±3 HV and 264±5 HV, respectively. Tensile testing demonstrated an ultimate tensile strength of 461±2 MPa, a yield strength of 273 MPa, and an elongation of 17.95±0.8% for the welded joint.

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Published
2025-12-15
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Vol 36 (2025)
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