JWJ > Volume 32(6); 2014 > Article
Journal of Welding and Joining 2014 December;32(6) :565-570.
Published online December 31, 2014.
doi:https://doi.org/10.5781/JWJ.2014.32.6.29
Effects of C on the Strength and Toughness of FCAW Weld Metal of YS 460 MPa Steels for Ship and Offshore Structures
Sang-Hoon Jeong*, Jeong-Ho Eom*, Han-Geul Choi*, Byung-Ho Jeong**, Sung-Hwa Hur**, 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 December 31, 2014
ABSTRACT
This paper has an purpose to study the effect of C on the toughness of YS 460 MPa FCAW weld metal. These effects were evaluated by charpy impact and CTOD test about 4 FCAW weld metal containing various C and Si content in relation to microstructure. Increase of C content was helpful to increase AF volume fraction and reduce PF(G) and FS volume fraction by increasing super cooling rate for ferrite transformation. Also, Increase of C content up to 0.045wt% made the strength and impact toughness higher by increasing AF volume fraction. The weld metal containing higher C content indicated higher CTOD value. It is because the volume fraction of PF(G) and FS, can play a role as crack initiation site, was reduced. Effect of C on the strength and elongation of weld metal was higher with an increase of Si contents.
Keywords: FCAW weld metal | C | Impact toughness | CTOD | Tensile properties
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