Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (48권6호 335-342)

Characteristics of GMA Weld Zone on TiO2 Different Component Flux Cored Wire for S500 Grade Steel

TiO2 성분 플럭스충진와이어에 따른 S500강의 GMA 용접부 특성

유철;고영봉;박경채;
Yoo, Cheol;Ko, Young-Bong;Park, Kyeung-Chae;

현대종합금속 기술연구소;한국화학융합시험연구원;경북대학교 공과대학 신소재공학과;
Technical Institute of Hyundai Welding Co., LTD.;Korea Testing & Research Institute (KTR);Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University;

DOI : 10.5695/JKISE.2015.48.6.335

Abstract

Recently, the production of oil and gas at the arctic ocean and offshore has been growing. Accordingly, S500 steel with the high tensile strength and excellent toughness has been used and flux cored wire that can be welded to the S500 has been required. In this study, we carried out observation of microstructures, mechanical properties and CTOD (crack tip openning displacement) in the weld zone that GMA (gas metal arc) welded with different component of $TiO_2$ flux core wire (the main components, rutile or Ti-slag) for S500 steel. Weld zone produced with Ti-slag flux cored wire has formed a enough acicular ferrite and shown excellent impact toughness at $-40^{circ}C$, tensile strength at room temperature and CTOD at $-20^{circ}C$. As a result, the developed flux cored wire was suitable for S500 steel.

Keywords

Flux cored wire;Impact toughness;Acicular ferrite;CTOD;S500;