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Effect of oxygen on hydrogen cracking in high-strength weld metal

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Abstract

The effect of oxygen content on the susceptibility of high-strength weld metal to hydrogen cracking is examined. Increasing oxygen content had a detrimental effect on the cracking susceptibility of weld metal containing a dψusible hydrogen content of 4.7 ppm. In weld metal containing a much lower dψusible hydrogen content (0.87 ppm), increasing weld metal oxygen content had no detrimental effect on hydrogen cracking susceptibility. These results are explained by a model which proposes that hydrogen cracking occurs when a critical oxide inclusion density promotes intergranular fracture at prior austenite grain boundaries and when a critical level of hydrogen is present in the weld metal. For the same level of hydrogen (moisture) contamination, high-strength weld metals containing oxygen contents greater than 200 ppm will be much more susceptible to hydrogen cracking than deposits made using inert gas-shielded or vacuum-operated welding processes.

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Abbreviations

α 1 :

coefficient of thermal expansion of the inclusion

α 2 :

coefficient of thermal expansion of the matrix

τ :

temperature change involved

Ó c :

circumferential stress

Ó r :

radial stress

d :

ratio ofR 1 toR 2

R 1 :

radius of the inclusion

R 2 :

outer radius of the matrix shell associated with the inclusion

ν 1 :

Poisson’s ratio of the inclusion

ν 2 :

Poisson’s ratio of the matrix

E 1 :

Young’s modulus of the inclusion

E 2 :

Young’s modulus of the matrix

d 1 :

volume fraction of inclusions

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Author information

Authors and Affiliations

  1. Department of Welding Engineering, Osaka University, Osaka, Japan

    K. Shinozaki (Research Instructor)

  2. Beijing Institute of Control Engineering, Beijing, People’s Republic of China

    X. Wang (Research Scientist)

  3. Department of Metallurgy and Materials Science, University of Toronto, M5S 1A4, ON, Canada

    T. H. North (WIC/NSERC Professor)

Authors
  1. K. Shinozaki
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  2. X. Wang
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  3. T. H. North
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Formerly Visiting Scientist, Department of Metallurgy and Materials Science, University of Toronto

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Shinozaki, K., Wang, X. & North, T.H. Effect of oxygen on hydrogen cracking in high-strength weld metal. Metall Trans A 21, 1287–1298 (1990). https://doi.org/10.1007/BF02656545

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  • DOI: https://doi.org/10.1007/BF02656545

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