A Study on the Predicting Transverse Residual Stress at the Ultra Thick FCA Butt Weldment of Hatch Coaming in a Large Container Vessel

Shin, Sang-Beom; Lee, Dong-Ju; Lee, Joo-Sung

Journal of KWJS 2010;28(4):33-40.
Published online September 8, 2010.

대형 컨테이너선의 해치 코밍 FCA 맞대기 용접부의 횡 방향 잔류응력 예측에 관한 연구

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A Study on the Predicting Transverse Residual Stress at the Ultra Thick FCA Butt Weldment of Hatch Coaming in a Large Container Vessel

Sang-Beom Shin, Dong-Ju Lee, Joo-Sung Lee

Abstract

The purpose of this study is to establish a predictive equation of transverse residual stress at the thick FCA butt weldment of large container vessel. The variables used were restraint degree, yield strength of base material, thickness of weldment and welding heat input. Restraint degree at the thick weldment of container ship having the various welding sequence was calculated using FEA. From the result, the H-type specimen was designed to reproduce the level of restraint degree at the actual weldment of containership. Based on the results, the predictive equations of the mean value and the distribution of transverse residual stress at each location of the weldment were established using dimensional analysis and multiple-regression method. The predictive equations were verified by comparing with those measured by XRD in the actual weldment of the ship.

Key Words: Containership, Transverse residual stress, Restraint degree, Heat input, Yield strength, FEA, Modified H-type specimen, XRD