Evaluation on Mechanical Properties with Welding Processes for Off Shore Wind Tower Application

Ji, Changwook; Choi, Chul Young; Nam, Dae-Geun; Kim, Hyoung Chan; Jang, Jae Ho; Kim, Ki Hyuk; Park, Yeong-Do

doi:2014.32.1.15

J Weld Join > Volume 32(1); 2014 > Article

Special Issue

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