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JWJ > Volume 32(4); 2014 > Article
Journal of Welding and Joining 2014 August;32(4) :401-406.
Published online August 30, 2014.
doi:https://doi.org/10.5781/JWJ.2014.32.4.63
Effects of PWHT on Tensile Properties and Impact Toughness of FCAW Weld Metal of FH Steels for Cargo Tank in LPG Carrier
Sang-Hoon Jeong*, Chang-Yong Kang**
*R&D Institute, Chosun Welding Co. Ltd., Ulsan 689-896, Korea
**Dept. of Metallurgycal Engineering, Pukyoung National University, Busan 608-739, Korea
Correspondence: Chang-Yong Kang  Email: metkcy@pknu.ac.kr
  Published online August 30, 2014
ABSTRACT
This paper has an aim to study the effect of PWHT and its conditions(peak temperature and holding time) on the tensile properties and impact toughness of FCAW weld metal in relation to microstructure. Impact toughness was evaluated to apply the cargo tank of liquified gas carriers under the various PWHT condition of each class societies. On the basis of these study, it was found that PWHT conditions within all class societies affect charpy absorbed energy of weld metal little or no, all PWHT weld metals kept similar level of charpy absorbed energy as as-weld weld metal down-to -60℃ and finally indicated lower energy value than that of as-weld weld metal at -75℃. It is because the precipitation of 2nd phase was controlled from welding consumable and the grain size was grown by PWHT.
Keywords: FCAW | PWHT | Tensile properties | Impact toughness | Grain growth
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