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<p>In this article, delta wire feed rate (DWFR, m/min) variation on Inconel 718-welded joints was carried out to explore the metallurgical and mechanical behavior by using a double-pulse metal inert gas (DP-MIG) welding process. Welding parameters include wire feed rate (WFR, m/min), thermal pulse frequency (<i>T</i><sub>F</sub>, Hz) as constant parameters, and DWFR with a variation of 2.5, 3.5, and 4.5&#xa0;m/min. The presence of secondary phases and liquation of grain boundaries was noticed at 3.5 and 4.5&#xa0;m/min due to a higher melting rate and insufficient time for solidification, whereas those scenarios were not noticed at 2.5&#xa0;m/min. Higher DWFRs lead to broader dendritic networks as well as the formation of primary carbides such as niobium carbide (NbC) which was revealed from HR-SEM analysis. The inverse pole figure (IPF) mapping from electron-backscattered diffraction (EBSD) analysis depicts the presence of finer grains at heat-affected zone (HAZ) and weld interface zone at 4.5&#xa0;m/min, whereas at 3.5&#xa0;m/min, it was noticed at the fusion zone (FZ). At higher DWFRs, the segregation of alloying elements increases which leads to the degradation of the strengthening phases <i>γ</i>′ and <i>γ</i>″ which results in inferior mechanical properties.</p>

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Influence of Delta Wire Feed Rate on Inconel 718-Welded Joints by Double Pulse MIG Welding

  • 期刊论文

  • 发表日期：

    2025年5月31日

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  • M. Shantharaj,
  • T. Rajasekaran

摘要

In this article, delta wire feed rate (DWFR, m/min) variation on Inconel 718-welded joints was carried out to explore the metallurgical and mechanical behavior by using a double-pulse metal inert gas (DP-MIG) welding process. Welding parameters include wire feed rate (WFR, m/min), thermal pulse frequency (TF, Hz) as constant parameters, and DWFR with a variation of 2.5, 3.5, and 4.5 m/min. The presence of secondary phases and liquation of grain boundaries was noticed at 3.5 and 4.5 m/min due to a higher melting rate and insufficient time for solidification, whereas those scenarios were not noticed at 2.5 m/min. Higher DWFRs lead to broader dendritic networks as well as the formation of primary carbides such as niobium carbide (NbC) which was revealed from HR-SEM analysis. The inverse pole figure (IPF) mapping from electron-backscattered diffraction (EBSD) analysis depicts the presence of finer grains at heat-affected zone (HAZ) and weld interface zone at 4.5 m/min, whereas at 3.5 m/min, it was noticed at the fusion zone (FZ). At higher DWFRs, the segregation of alloying elements increases which leads to the degradation of the strengthening phases γ′ and γ″ which results in inferior mechanical properties.