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<p>This study investigates the influence of filler wires on the mechanical and metallurgical properties of Inconel 617 (IN 617) welds carried out using SpinArc metal inert gas (MIG) welding. Welds were fabricated using three different filler wires: IN 718, P91, and ER308H. Microstructural analysis revealed that welds produced with IN718 filler exhibited a higher fraction of equiaxed dendrites, while ER308H welds showed the finest grain size of 8.10&#xa0;µm based on EBSD analysis. EDS results indicated minimal chromium segregation in IN718 and ER308H welds, whereas no segregation was observed in P91 welds. The weld produced using IN 718 filler wire exhibited the highest tensile strength (800&#xa0;MPa), and the weld produced using P91 filler wire had the highest impact toughness (116&#xa0;J). Results indicate filler wire chemistry strongly influences dendrite morphology, elemental segregation, and strain accumulation, which in turn govern the mechanical performance of the weld. This study provides correlations between filler wire chemistry, dendrite morphology, grain boundary characteristics, and mechanical properties in SpinArc MIG welded IN 617. These findings provide practical guidance for filler wire selection in the fabrication of AUSC boiler components, where IN718 filler is favorable for strength-critical applications, while P91 filler provides superior impact toughness.</p>

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Influence of Filler Wire Chemistry on Solidification Microstructure and Mechanical Properties of SpinArc MIG Welded Inconel 617

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Thayumanavan Singaravel,
  • Rudra Mahadev,
  • T. Deepan Bharathi Kannan,
  • Santhanakrishnan Radhakrishnan

摘要

This study investigates the influence of filler wires on the mechanical and metallurgical properties of Inconel 617 (IN 617) welds carried out using SpinArc metal inert gas (MIG) welding. Welds were fabricated using three different filler wires: IN 718, P91, and ER308H. Microstructural analysis revealed that welds produced with IN718 filler exhibited a higher fraction of equiaxed dendrites, while ER308H welds showed the finest grain size of 8.10 µm based on EBSD analysis. EDS results indicated minimal chromium segregation in IN718 and ER308H welds, whereas no segregation was observed in P91 welds. The weld produced using IN 718 filler wire exhibited the highest tensile strength (800 MPa), and the weld produced using P91 filler wire had the highest impact toughness (116 J). Results indicate filler wire chemistry strongly influences dendrite morphology, elemental segregation, and strain accumulation, which in turn govern the mechanical performance of the weld. This study provides correlations between filler wire chemistry, dendrite morphology, grain boundary characteristics, and mechanical properties in SpinArc MIG welded IN 617. These findings provide practical guidance for filler wire selection in the fabrication of AUSC boiler components, where IN718 filler is favorable for strength-critical applications, while P91 filler provides superior impact toughness.