Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Experimental Study of the Redistribution of Welding Distortion According to the Partial Removal of Welded Structure

용접구조물의 부분 제거에 따른 용접변형의 재분포에 관한 실험적 연구

  • Kim, Yong Rae (School of Mechanical Engineering, Yeungnam Univ.) ;
  • Wang, Chao (School of Mechanical Engineering, Yeungnam Univ.) ;
  • Kim, Jae Woong (School of Mechanical Engineering, Yeungnam Univ.)
  • 김용래 (영남대학교 기계공학부) ;
  • 왕초 (영남대학교 기계공학부) ;
  • 김재웅 (영남대학교 기계공학부)
  • Received : 2015.03.17
  • Accepted : 2015.05.07
  • Published : 2015.07.01
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Abstract

During the welding process, welding distortion is caused by the non-uniformity of the temperature distribution in the weldment. Welding distortion is redistributed because the residual stress and rigidity change according to the removal of the welded structure. In shipbuilding in particular, this phenomenon may be observed during the cutting process of lugs that are attached to blocks for transfer. The redistribution of welding distortion also causes problems, such as damage to the cutting tool. The aim of this study is to experimentally analyze the redistribution of welding distortion because of the partial removal of the welded structure. In the experiments conducted in this study, fillet welding and cutting were performed, and longitudinal bending and angular distortion in the welded structures were then investigated and analyzed.

용접변형은 용접 시 구조물 내에서의 불균일한 온도분포특성으로 인하여 필연적으로 유발되는 현상이다. 또한 용접변형이 발생된 용접구조물의 일부를 제거하는 과정에서 구조물내의 용접잔류응력과 강성의 연속적인 변화에 따라 추가적인 변형이 발생하여 변형의 재분포가 이루어진다. 특히, 이러한 현상은 선박의 제조과정 중 대형블럭을 옮기기 위해 설치된 러그의 절단과정에서 살펴볼 수 있다. 용접구조물의 부분 제거 시 발생되는 변형의 재분포는 절단공구의 파손 등의 문제를 야기하기도 한다. 본 논문은 실험을 통하여 용접구조물의 부분 제거에 따른 용접변형의 재분포가 어떠한 양상으로 발생되는지 연구하기 위한 것이다. 실험을 위해 필릿용접을 실시하였고, 용접된 리브의 일부를 제거함에 따라 발생되는 종굽힘과 각변형을 측정하여 비교 및 분석하였다.

Keywords

References

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