Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/2176-1523.20242848
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

Microstructural evaluation of Inconel 625 weld cladding deposited by the GMAW and GMAW with rotating electrode processes

Avaliação microestrutural de revestimentos depositados com Inconel 625 pelos processos GMAW e GMAW com eletrodo rotativo

Jeferson Frederico Monteiro Costa, Jorge Carlos Ferreira Jorge, Luís Felipe Guimarães de Souza, Matheus Campolina Mendes, Humberto Nogueira Farneze, Hiron Akira Yamada Magalhães

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Abstract

The microstructure of the Inconel 625 single layer weld cladding deposited by the conventional GMAW and GMAW with rotating electrode (GMAW-RE) processes on carbon steel is investigated. Metallographic characterization was performed on samples removed transversally to the weld deposit by optical and scanning electron microscopy equipped with energy dispersive spectrometry to evaluate the secondary phases. The results showed that the GMAW-RE process provided a more homogeneous penetration and a lower dilution rate than the GMAW process. As a consequence, a reduced Fe content and a refined austenitic microstructure with a lower amount of secondary phases were observed, factors that contribute greatly to better overlay performance. This superior performance indicates that the GMAW-RE process has the potential to be an advantageous alternative for Inconel 625 weld claddings.

Keywords

Nickel alloy 625; GMAW-RE process; Weld metal; Welding; Secondary phases

Resumo

Este trabalho realiza uma análise comparativa da microestrutura de revestimentos com Inconel 625 depositados em camada única pelos processos GMAW convencional e GMAW com eletrodo rotativo (GMAW-RE) sobre aço carbono. A caracterização metalográfica foi realizada em amostras removidas transversalmente ao depósito de solda por microscopia ótica e eletrônica de varredura equipada com espectrometria de energia dispersiva para avaliação de fases secundárias. Os resultados mostraram que o processo GMAW-RE permitiu a deposição com penetração mais homogênea e menor taxa de diluição que o processo GMAW. Como consequência, foi observado um teor do elemento Fe reduzido e uma microestrutura austenítica refinada com menor fração de fases secundárias, fatores que contribuem sobremaneira para um melhor desempenho do revestimento. Este melhor comportamento indica que o processo GMAW-RE tem potencial para ser uma alternativa vantajosa para soldagem de revestimento com Inconel 625.

Palavras-chave

 Liga de níquel 625; Processo GMAW-RE; Metal de solda; Soldagem; Fases secundárias

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Submetido em:
03/03/2023

Aceito em:
15/05/2024

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