Effect of Weld Improvement on the Corroded Fatigue Life of Welded Structures

J. Ocean Eng. Technol. 2008;22(2):50-57.

Im Sung-Woo,Chang In-Hwa,Kim Sang-Shik,Song Ha-Cheol

Research Industrial Science and Technology,Research Industrial Science and Technology,Gyeongsang National University,Mokpo National University

용접구조물의 부식피로수명에 미치는 용접부 개선처리 효과

임성우,장인화,김상식,송하철

포항산업과학연구원 강구조연구소,포항산업과학연구원 강구조연구소,경상대학교 나노신소재공학부,국립목포대학교 기계선박해양공학부

Keywords: Corroded fatigue life, Weld improvement, Toe grinding, Weld profiling, TIG dressing TIG, API 2W Gr.50T steel plate API 2W Gr.50T

핵심용어: 부식피로수명, 용접부 개선처리, 토우 그라인딩, 용접 프로우파일링, 드레싱, 후판

Abstract

The effect of weld improvement on the corroded fatigue life of welded structures was investigated. Toe grinding, TIG dressing and weld profiling were used as the geometric improvement methods. Fatigue tests under the corroded condition in artificial seawater were carried out to investigate the corrosion fatigue behavior of API 2W Gr.50T steel plate produced by POSCO. The test results in weld improved conditions were compared with those in as-welded condition. The test results were also compared with the design curves in UK DEn Class F. Corroded fatigue life of weld improved specimens was longer than that of as-welded specimen. Especially, the corroded fatigue life exceeded the mean SN curve in air of UK DEn Class F.