Paper Title:
Effect of Weld Metal Microstructure on Cold Crack Susceptibility of High Strength Weld
  Abstract

Facing the practical difficulties in reducing the diffusible hydrogen content of fluxcontaining welding consumables like flux-cored arc 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.

  Info
Periodical
Materials Science Forum (Volumes 580-582)
Edited by
Changhee Lee, Jong-Bong Lee, Dong-Hwan Park and Suck-Joo Na
Pages
13-16
DOI
10.4028/www.scientific.net/MSF.580-582.13
Citation
H. J. Kim, J. S. Seo, J. H. Kim, K. H. Kim, J. H. Koh, H. S. Ryoo, M. Y. Huh, "Effect of Weld Metal Microstructure on Cold Crack Susceptibility of High Strength Weld", Materials Science Forum, Vols. 580-582, pp. 13-16, 2008
Online since
June 2008
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Price
$32.00
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