Effect of weld metal microstructure on cold crack susceptibility of high strength weld

Hee Jin Kim, Jun Seok Seo, Jae Hak Kim, Ka Hee Kim, Jin Hyun Koh, Hoi Soo Ryoo, Moo Young Huh

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Facing the practical difficulties in reducing the diffusible hydrogen content of fluxcontaining welding consumables like flux-cored are welding (FCAW) wires, the present study investigated the microstructural aspect to improve the hydrogen-induced cold crack (HICC) resistance of multipass weld metal of 600MPa strength. Two FCA welding wires were prepared by controlling the Ni content to give different weld microstructure, but to have similar levels of hardness and diffusible hydrogen content. HICC susceptibility of those two consumables was evaluated by 'G-BOP test' and also by 'multi-pass weld metal cold cracking test'. As a result of this study, it was demonstrated that microstructural modification with decreased proportion of grain boundary ferrite (GF) improved cold crack resistance of weld metal. The detrimental effect of GF against HICC has also been addressed based on the characteristics of weld metal cold cracking.

Original languageEnglish
Title of host publicationMaterials Science Forum - Advanced Welding and Micro Joining/Packaging for the 21st Century - Selected peer reviewed papers from the International Welding/Joining Conference-Korea 2007, IWJC 2007
EditorsChang Hee Lee, Jong-Bong Lee, Jong-Bong Lee, Dong-Hwan Park, Suck-Joo Na
PublisherTrans Tech Publications Ltd
Number of pages4
ISBN (Electronic)9780878493609
Publication statusPublished - 2008
EventInternational Welding/Joining Conference-Korea 2007, IWJC 2007 - Seoul, Korea, Republic of
Duration: 2007 May 102007 May 12

Publication series

NameMaterials Science Forum
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


OtherInternational Welding/Joining Conference-Korea 2007, IWJC 2007
Country/TerritoryKorea, Republic of


  • Acicular ferrite
  • Cold cracking
  • Diffusible hydrogen
  • Grain boundary ferrite
  • Weld metal

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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