A Study on the Analysis of Welding Distortion for Moon Pool Structure of FPSO Vessel

J. Ocean Eng. Technol. 2003;17(3):27-32.

KIM SANG-IL;

Ship & Marine Structure R&D Team, Daewoo Shipbuilding & Marine Engineering Co., Ltd.;

FPSO선 Moon Pool구조의 용접변형 해석에 관한 연구

김상일;

대우조선해양(주) 선박해양구조연구팀;

핵심용어: Welding Distortion 용접변형, Geometric Inaccuracy 기하학적 부정확성, Additional Man-Hours 추가 공수, Distortion Control Method 변형 제어법, Optimum Welding Sequence 최적의 용접순서

Abstract

The welding distortion of a hull structure in the shipbuilding industry is inevitable at each assembly stage. The geometric inaccuracy caused by the distortion tends to preclude the introduction of automation and mechanization. Thus, additional man-hours are needed for the adjusting work in the assembly stage. To overcome this problem, a distortion control method should be applied. For this purpose, it is necessary to develop an accurate prediction method that can explicitly account for the influence of various factors on the welding distortion. In order to minimize the weld-induced residual deformation, this paper proposes the optimum welding sequence as a method for distortion control. The validity of this method has been substantiated by a number of numerical simulations and experiments.