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In this study, investigation of dissimilar welded joint between nickel-Based alloy Inconel 718 and AISI 321 Austenitic Stainless Steel (ASS) was performed with ERNiCrMo-4 filler material using pulsed-tungsten arc welding (P-TIG) technique. On the dissimilar welded joint, the microstructure examination as well as mechanical test was performed to find out the structure and quality. The microstructural investigation showed finer equiaxed grains in the weld Area (WA) and migrated grain boundaries (MGBs) next to the weld line on Inconel 718 side and AISI 321 ASS. Additionally, Mo-rich phase was detected at the interface of the Inconel 718 using optical microscope (OM), scanning electron microscope equipped with electron dispersive spectroscopy (SEM-EDS). It is found that using ERNiCrMo-4 filler in conjunction with P-TIG resulted in optimum properties with failure occurring at AISI 321 ASS base material (BM) under tensile test. Furthermore, the AISI 321 Austenitic stainless steel is abundantly available and it is very economical when compared to the Inconel 718. Hence, this investigation will provide an insight in considering AISI 321 as an alternative of Inconel 718 using ERNiCrMo-4 filler wire in combination with P-TIG for high-temperature applications.

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Effect of P-TIG Welding Technique on the Microstructure and Mechanical Properties of Dissimilar Welded Inconel 718 and AISI 321 Butt Joint

  • 会议论文

  • 发表日期：

    2025年

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  • Sumitra Sharma,
  • Alok Prakash,
  • Ashutosh Padhan

摘要

In this study, investigation of dissimilar welded joint between nickel-Based alloy Inconel 718 and AISI 321 Austenitic Stainless Steel (ASS) was performed with ERNiCrMo-4 filler material using pulsed-tungsten arc welding (P-TIG) technique. On the dissimilar welded joint, the microstructure examination as well as mechanical test was performed to find out the structure and quality. The microstructural investigation showed finer equiaxed grains in the weld Area (WA) and migrated grain boundaries (MGBs) next to the weld line on Inconel 718 side and AISI 321 ASS. Additionally, Mo-rich phase was detected at the interface of the Inconel 718 using optical microscope (OM), scanning electron microscope equipped with electron dispersive spectroscopy (SEM-EDS). It is found that using ERNiCrMo-4 filler in conjunction with P-TIG resulted in optimum properties with failure occurring at AISI 321 ASS base material (BM) under tensile test. Furthermore, the AISI 321 Austenitic stainless steel is abundantly available and it is very economical when compared to the Inconel 718. Hence, this investigation will provide an insight in considering AISI 321 as an alternative of Inconel 718 using ERNiCrMo-4 filler wire in combination with P-TIG for high-temperature applications.