Characterization of the local brittle layer formed in electro-gas weld metals

Kangmyung Seo, Hoisoo Ryoo, Hee Jin Kim, Joong Geun Yoon, Changhee Lee

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The microstructural characteristics of the local brittle layer (LBL) reported to be formed at the weld center of tandem electro-gas (EG) weld made with EG70T-G wire have been investigated to identify the critical factors causing its brittleness and thus facilitate the development of welds free from the local brittle layer. The results showed that in addition to the directional characteristics of columnar grain structures, the proportion of grain boundary ferrite played an important role in LBL formation and in controlling the impact toughness of electro-gas welds at the weld center. These results led to investigate the additional electro-gas welds containing less amounts of grain boundary ferrite with an aim to improve the toughness at weld center. In addition, the relative brittleness of the local brittle layer was evaluated in terms of Charpy V-notch ductile-brittle transition curves and a stepwise transition unusually obtained from local brittle layer was discussed from the perspective of the microstructural characteristics of LBL.

Original languageEnglish
Pages (from-to)513-524
Number of pages12
JournalWelding in the World
Volume65
Issue number3
DOIs
StatePublished - 2021 Mar

Keywords

  • EG70T-G wire
  • Electro-gas weld metals
  • Local brittle layer

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