Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Study on the Prediction of Shrinkage and Residual Stress for the HY-100 Weldment Considering the Phase Transformation

상 변태를 고려한 HY-100강 용접부의 수축 및 잔류응력 예측에 관한 연구

  • Lee, Hee-Tae (Industrial Research Institute, Hyundai Heavy Industries Co., Ltd.) ;
  • Shin, Sang-Beom (Industrial Research Institute, Hyundai Heavy Industries Co., Ltd.)
  • 이희태 (현대중공업(주) 기술개발본부 산업기술연구소) ;
  • 신상범 (현대중공업(주) 기술개발본부 산업기술연구소)
  • Published : 2007.02.28
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Abstract

For high performance and structural stability, application of high strength steel has continuously increased. However, the change of the base metal gives rise to problems with the accuracy management of the welded structure. It is attributed to the martensite phase transformation of the high strength low alloy steel weldment. The purpose of this study is to establish the predictive equation of transverse shrinkage and residual stress for the HY-100 weldment. In order to do it, high speed quenching dilatometer tests were performed to define a coefficient of thermal expansion(CTE) at the heating and cooling stage of HY-100 with various cooling rates. Uncoupled thermal-mechanical finite element(FE) models with CTE were proposed to evaluate the effect of the martensite phase transformation on transverse shrinkage and residual stresses at the weldment. FEA results were verified by comparing with experimental results. Based on the results of extensive FEA and experiments, the predictive equation of transverse shrinkage and longitudinal shrinkage force at the HY-100 weldment were formulated as the function of welding heat input/in-plane rigidity and welding heat input respectively.

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