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<p>This work presents innovative findings on the weld overlay cladding of a 9%Ni steel using Inconel 625 alloy deposited by GMAW with a rotating electrode. Initially, beads on plate were deposited at rotation frequencies ranging from 0 to 2500&#xa0;rpm to study the influence of this parameter on the geometric characteristics of weld beads. Afterward, a single layer cladding was performed at the selected frequency to determine the microstructure and corrosion properties of the deposited cladding. The microstructure was characterized using optical and scanning electron microscopy, as well as electron backscattering diffraction. Corrosion tests were conducted to evaluate the pitting potential, critical pitting temperature, and weight loss, in accordance with current standards. The results revealed the absence of martensite with high hardness at the fusion line, an appropriate thickness, and Fe content lower than 10%. The austenitic microstructure, with a low fraction of Laves phase and NbC, exhibited suitable performance in the corrosion tests according to the applicable standards. These results indicate that the GMAW-RE process has the potential to deposit single layer cladding with quality and can be an advantageous and cost-effective option for the petroleum industry. </p>

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Inconel 625 weld cladding over a 9Ni steel deposited by the GMAW process with rotating electrode

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Camila M. B. Silva,
  • Matheus C. Mendes,
  • Humberto N. Farneze,
  • Luís Felipe G. de Souza,
  • Hiron A. Y. Magalhães,
  • Jeferson F. M. Costa,
  • Jorge C. F. Jorge

摘要

This work presents innovative findings on the weld overlay cladding of a 9%Ni steel using Inconel 625 alloy deposited by GMAW with a rotating electrode. Initially, beads on plate were deposited at rotation frequencies ranging from 0 to 2500 rpm to study the influence of this parameter on the geometric characteristics of weld beads. Afterward, a single layer cladding was performed at the selected frequency to determine the microstructure and corrosion properties of the deposited cladding. The microstructure was characterized using optical and scanning electron microscopy, as well as electron backscattering diffraction. Corrosion tests were conducted to evaluate the pitting potential, critical pitting temperature, and weight loss, in accordance with current standards. The results revealed the absence of martensite with high hardness at the fusion line, an appropriate thickness, and Fe content lower than 10%. The austenitic microstructure, with a low fraction of Laves phase and NbC, exhibited suitable performance in the corrosion tests according to the applicable standards. These results indicate that the GMAW-RE process has the potential to deposit single layer cladding with quality and can be an advantageous and cost-effective option for the petroleum industry.