Volume 4, Issue 1 (Journal OF Welding Science and Technology of Iran 2018)                   JWSTI 2018, 4(1): 29-41 | Back to browse issues page

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The Effect of Hydrogen Content and Welding Conditions on the Hydrogen Induced Cracking of the API X70 Steel Weld
A. Talebi Hanzaei1 , P. Marashi1 , E. Ranjbarnodeh * 1, A. Hamdollahzadeh2
1- Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, Tehran, Iran
2- Iranian Gas Engineering and Development Co.
Abstract:   (5629 Views)
In this study, first,diffusible hydrogen of cellulosic electrode E8010-P1 and low hydrogen electrode E8018-G was measured by mercury displacement method according to ISO3690. Then,the effect of preheating and post-heating on the sensitivity to hydrogen inducedcold cracking in welding of 18mm API5L X70 steel with these electrodes was investigated according to ISO17642-2. The results of visual inspection, penetrant test,metallographic examination, and hardness test showed that welding with cellulosic electrode leads to cracking unless both preheating and post-heating are applied.While in the case of low hydrogen electrode, cracking occurs only if no preheating or post-heating is applied.
 
Keywords: Hydrogen Inducedcold Cracking, Preheating, Post-heating, Diffusible Hydrogen, API X70 Steel.
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Type of Study: Research | Subject: Special
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