Advanced Search  
JWJ > Volume 32(1); 2014 > Article
Journal of Welding and Joining 2014 February;32(1) :93-101.
Published online February 27, 2014.
doi:https://doi.org/10.5781/JWJ.2014.32.1.93
Effect of Heat Input of Outside Weld on Low Temperature Toughness of Inside Weld for Multiple Electrode SA Welded API 5L X70 with Sour Gas Resistance
Hyun-Jun An*, Hee-Keun Lee**, Young-Gyu Park***, Seong-Su Eun***, Chung-Yun Kang*
*National Core Research Center(NCRC), Pusan National University, Busan 609-735, Korea
**Dept. of Material Science and Engineering, Pusan National University, Busan 609-735, Korea
***Technical Research Laboratories, SeAH steel, Pohang 790-240, Korea
Correspondence: Chung-Yun Kang  Email: kangcy@pusan.ac.kr
  Published online February 27, 2014
ABSTRACT
This study aims to investigate the effect of heat input of outside SAW weld on low temperature toughness(-20℃) of inside SAW weld for API 5L X70 with sour gas resistance. As increasing heat input of the outside weld, low temperature toughness of the inside weld was decreased. Especially, in spite of the same heat input, the value of low temperature toughness was fluctuated. On the basis of fracture and microstructure analysis, the low temperature toughness is correlated with the fracture area ratio of shear lips and four kinds of fracture sections. These sections were divided with size and shape of dimple correlated with grain boundary ferrite and cleavage correlated acicular and polygonal ferrite in grain. Therefore, it was seen that these sections were two of final solidification area in the inside weld and the outside weld, no reheated zone and reheated zone in the inside weld. In conclusion, it is thought that the difference of low temperature toughness at the same heat input is due to the fact that each of impact test specimens could have the different microstructure, even though the notch was machined under the error tolerance of 1mm. It is because the final solidification area of the inside weld is very narrow.
Keywords: API 5L X70 | Multiple electrode SAW | Low temperature toughness | Fractography | Microstructure.
TOOLS
PDF Links  PDF Links
Full text via DOI  Full text via DOI
Download Citation  Download Citation
CrossRef TDM  CrossRef TDM
  E-Mail
Share:      
METRICS
1
Crossref
1,250
View
12
Download
Related article
e-sciencecentral
Register for e-submission
Register here to access the e-submission system of Journal of Welding and Joining for authors and reviewers.
Manuscript Submission
To submit a manuscript, please visit the Journal of Welding and Joining e-submission management system at http://submit.e-jwj.org, read the Instructions for Authors, and log into the Journal of Welding and Joining e-submission system. For assistance with manuscript submission, please contact: koweld@kwjs.or.kr.
Free archive
Anyone may access any past or current articles without logging in.
Editorial Office
The Korea Science and Technology Building, New B/D, Room 503
Teheran-ro 7-gil, 22(635-4, Yeoksam-Dong), Gangnam-gu, Seoul 06130, Korea
TEL : +82-2-538-6511    FAX : +82-2-538-6510   E-mail: koweld@kwjs.or.kr
Browse Articles |  Current Issue |  For Authors and Reviewers |  About
Copyright© by The Korean Welding and Joining Society. All right reserved.