The Performance of the heat affected zone of 9% Ni steel narrow gap joint performed by the GMAW process with rotating electrode

Jorge Carlos Ferreira  JORGE; Jeferson Frederico Monteiro  COSTA; Matheus Campolina  MENDES; Luís Felipe Guimarães de SOUZA; Hiron Akira Yamada MAGALHÃES; Leonardo Sales  ARAÚJO

doi:10.55713/jmmm.v36i3.2654

Authors

Jorge Carlos Ferreira JORGE Centro Federal de Educação Tecnológica Celso Suckow da Fonseca (CEFET-RJ), Avenida Maracanã 229, Rio de Janeiro, 20271-110, Brazil
Jeferson Frederico Monteiro COSTA Centro Federal de Educação Tecnológica Celso Suckow da Fonseca (CEFET-RJ), Avenida Maracanã 229, Rio de Janeiro, 20271-110, Brazil
Matheus Campolina MENDES Centro Federal de Educação Tecnológica Celso Suckow da Fonseca (CEFET-RJ), Avenida Maracanã 229, Rio de Janeiro, 20271-110, Brazil
Luís Felipe Guimarães de SOUZA Centro Federal de Educação Tecnológica Celso Suckow da Fonseca (CEFET-RJ), Avenida Maracanã 229, Rio de Janeiro, 20271-110, Brazil
Hiron Akira Yamada MAGALHÃES Centro Federal de Educação Tecnológica Celso Suckow da Fonseca (CEFET-RJ), Avenida Maracanã 229, Rio de Janeiro, 20271-110, Brazil
Leonardo Sales ARAÚJO Universidade Federal do Rio de Janeiro, Rio de Janeiro, 20271-110, Brazil

DOI:

https://doi.org/10.55713/jmmm.v36i3.2654

Keywords:

GMAW-RE process, 9% Ni steel, Mechanical properties, Microstructure, productivity

Abstract

This work investigates the mechanical properties and microstructural evolution of the heat-affected zone of 9% Ni steel narrow-gap welded joints produced by the GMAW process with a rotating electrode, since no literature on this subject is available. This process is an innovation of the GMAW process, which permits narrow gap welding because the circular motion of the electrode overcomes the main issue of the sidewall's lack of fusion observed in the conventional process. However, the rotation movement of the electric arc imposes a higher peak temperature at the heat affected zone, which can negatively affect the mechanical properties. The joints were welded in the flat position, preheated to 100°C, with a rotation frequency of 1500 rpm, a rotation diameter of 3 mm, and an average heat input of 2 kJ·mm^‒1. The results obtained in metallographic examination by electron microscopy and backscattering diffraction, and tensile and Charpy-V impact tests revealed similar behavior of the heat-affected zone compared with the base metal. Thus, it is concluded that the 9% Ni steel welded by the GMAW process with a rotating electrode can be an advantageous alternative due to its higher productivity and mechanical properties that meet the requirements for industrial applications.

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