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J Weld Join > Volume 32(1); 2014 > Article
Journal of Welding and Joining 2014;32(1):15-21.
DOI: https://doi.org/10.5781/JWJ.2014.32.1.15    Published online February 27, 2014.
Evaluation on Mechanical Properties with Welding Processes for Off Shore Wind Tower Application
Changwook Ji*, Chul Young Choi*, Dae-Geun Nam**, Hyoung Chan Kim**, Jae Ho Jang**, Ki Hyuk Kim***, Yeong-Do Park****
Correspondence:  Yeong-Do Park,
Email: ypark@deu.ac.kr
Abstract
FCAW(Flux Cored Arc Welding), SAW(Submerged Arc Welding), EGW(Electro Gas Welding), and three-pole SAW are applicable in manufacturing the offshore wind tower. In this paper, mechanical properties of these welded-joints for TMCP steels were evaluated in all above welding processes. The tensile strength of welded-joints for all the welding methods satisfied the standard guideline (KS D 3515). No cracking on weldment was found after the bending test. Changes of weldedments hardness with welding processes were observed. In a weld HAZ (heat-affected zone), a softened HAZ-zone was formed with high heat input welding processes (SAW and EGW). However, the welded-joint fractures were found in the base metal for all cases and small decrease in welded-joint strength was caused by a softened zone. The multi-pole SAW welds exhibited similar mechanical properties comparing to the one with one-pole SAW process.
Key Words: FCAW, SAW, EGW, Wind tower, TMCP


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