Abstract
Abstract Several methodologies analyzing welding distortions of large shell structures like ship blocks have been developed and utilized in shipyards for a long times ago. In general, one of objects of thermal distortion analysis is to find welding sequence making least-deformation without any suppliance, and it can be solved easily and rapidly by EP strain-boundary method. But after assembly construction, there are usually more than 10 weldments in each process, and the number of sequence will follow the Factorial calculation. In this research, a method has been suggested to decide the best welding sequence by minimum analysis. Using this method, welding deformation could be reduced just analyzing some cases as many as the number of weldments. Experiments and Analysis of all cases were also done, and their best results are good agreements with predictation by suggested methodology.Key Words : Ship block, Wedling distortion, Shell element, FEM, Sequence 1. 서 론 선박의 건조과정에 적용되는 생산기술 중 과거에는 경험으로 진행되던 많은 분야가 현재는 상당 부분 공학적 시뮬레이션의 범위 내에 포함되어 합리화 및 최적화의 과정을 거치고 있다. 대표적으로 용접 열변형 해석
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