A Study on Stree Analysis and Bending Fatigue Strength of One Side Fillet Welded T-joint

J. Ocean Eng. Technol. 1999;13(2):51-57.

Gang, Seong-Won;Lee, Tae-Hun;Jeon, Jae-Mok;Kim, Chung-Hui;

T형 평면용접이음재의 응력해석과 굽힘피로강도에 관한 연구

강성원;이태훈;전재목;김충희;

부산대학교 공과대학 조선해양공학과, 기계기술연구소;부산대학교 공과대학 조선해양공학과 대학원;부산기능대학 산학협력과;한국선급 울산지부;

Keywords: One Side Fillet Welded T-joint, Stress Analysis, Bending Fatigue Strength, Optimum Weld Joint Design

핵심용어: T형 편면용접이음재, 응력해석, 굽힘피로강도, 최적용접이음 설계

Abstract

In this study, one side fillet welded T-joint, used in box type girder and other welding structure, was investigated by stress analysis and bending fatigue test without edge preparation, with variation of joint shape. The purpose of this study is to give the welding condiltion and design standard on manufacturing one side fillet welded T-joint. As a result, the following conclusions were obtained. 1) In one side fillet welded T-joint, the larger the leg length and the penetration depth, the greater the bending fatigue strength because reduction of stress and strain on toe and root. The increase of the longitudinal leg length rather than vertical leg length contributed to the increase in bending fatigue strength. 2) In one side fillet welded T-joint without edge preparation, both general manual welding and general automatic welding were carried out with same condition. In this case, automatic welding showed deeper penetration and more increased longitudinal leg length than manual welding, so that automatic welding offers greater bending fatigue strength. 3) For one side fillet welded T-joint without edge preparation with automatic welding, the ratio(h/t) of the leg length(h) and the main plate thickness(t) in which toe crake can occur was 1.0 over.