A Study on the Thermal and Mechanical Characteristic of Hybrid Welded Ship Structure A-grade Steel

J. Ocean Eng. Technol. 2007;21(1):64-68.

Oh, Chong-In;Kim, Young-Pyo;Park, Ho-Kyung;Bang, Han-Sur;

Department of Ocean & Naval Architecture Engineering, Chosun University;Department of Ocean & Naval Architecture Engineering, Chosun University;Department of Ocean & Naval Architecture Engineering, Chosun University;Department of Aerospace & Naval Archite

선체구조용 A급 강재의 하이브리드 용접에 대한 열 및 역학적 특성에 관한 연구

오종인;김영표;박호경;방한서;

조선대학교 일반대학원 선박해양공학과;조선대학교 일반대학원 선박해양공학과;조선대학교 일반대학원 선박해양공학과;조선대학교 공과대학 항공조선공학부;

Keywords: Ship structure A-grade steel, A-grade, Hybrid welding, Finite element method, Welding residual stress, Heat source model, Optimized welding condition

핵심용어: 선박구조용, 강재, 하이브리드 용접, 유한요소법, 용접 잔류응력, 열원 모델, 최적화된 용접 조건

Abstract

Recently, there has been considerable research in the field of application of Laser-Arc hybrid welding for superstructures, such as ship-structures, transport vehicles etc. However, the study on heat distribution and welding residual stress of hybrid weld by numerical simulation leaves much to be desired. Therefore, in this study, an optimized welding condition and numerical simulation for hybrid welding, using previous numerical analysis to calculate the heat source for hybrid welding, has been analyzed. For this purpose, fundamental welding phenomena of the hybrid process, using Laser and, is investigated. In order to calculate temperature and residual stress distribution in hybrid welds, a finite element heat source model is developed on the basis of experimental results and characteristics of temperature. Residual stress distribution in hybrid welds are understood from the result of simulation, and compared with the experimental values.