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지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2009.11
- 수록면
- 210 - 216 (7page)
이용수
초록· 키워드
오류제보하기
The use of thin plate increases due to the need for light weight in large ship. Thin plate iseasily distorted and has residual stress by welding heat. Therefore, the thin plate should be carefully joined to minimize the welding deformation which costs time and money for repair. For one effort to reduce welding deformation, it is very useful to predict welding deformation before welding execution.
There are two methods to analyze welding deformation. One is simple linear analysis. The other is nonlinear analysis. The simple linear analysis is elastic analysis using the equivalent load method or inherent strain method from welding experiments. The nonlinear analysis is thermo-elastic analysis which gives consideration to the nonlinearity of material dependent on temperature and time, welding current, voltage, speed, sequence and constraint.
In this study, the welding deformation is analyzed by using thermo-elastic method for PCTC(Pure Car and Truck Carrier) which carries cars and trucks. PCTC uses thin plates of 6mm thickness which is susceptible to welding heat. The analysis dimension is 19,200㎜(length) 13,825㎜(width) * 376㎜(height). MARC and MENTAT are used as pre and post processor and solver.
The boundary conditions based on the real situation in shipyard is applied in simulations. Natural convection and gravity is taken into consideration. The material of the thin block is mild steel with 235N/㎟ yield strength. Its nonlinearity of conductivity, specific heat, young’s modulus and yield strength is considered in simulations. Welding in simulations is done in two pass. First pass lasts 2,100 second, then it rests for 900 second, then second pass lasts 2,100 second and then it rests for 20,000 second.
The displacement at 0 sec is caused by its own weight. It is maximum 19㎜ at the free side. The welding line expands, shrinks during welding and finally experiences shrinkage. It results in angular distortion of thin block. Final maximum displacement, 17㎜ occurs around welding line. The maximum residual stress happens at the welding line, where the stress is above the yield strength. Also, the maximum equivalent plastic strain occurs at the welding line. The plastic strain of first pass is more than that of second pass.
The flatness of plate in longitudinal direction is calculated in parallel with the direction of girder and compared with deformation standard of ±15㎜. Computed value is within the standard range. The flatness of plate in transverse direction is figured out in perpendicular to the direction of girder and compared with deformation standard of ±6㎜. It satisfies the standard. Buckle of plate is considered between each longitudinal and compared with the deformation standard. All buckle value is within the standard range of ±6㎜.
There are two methods to analyze welding deformation. One is simple linear analysis. The other is nonlinear analysis. The simple linear analysis is elastic analysis using the equivalent load method or inherent strain method from welding experiments. The nonlinear analysis is thermo-elastic analysis which gives consideration to the nonlinearity of material dependent on temperature and time, welding current, voltage, speed, sequence and constraint.
In this study, the welding deformation is analyzed by using thermo-elastic method for PCTC(Pure Car and Truck Carrier) which carries cars and trucks. PCTC uses thin plates of 6mm thickness which is susceptible to welding heat. The analysis dimension is 19,200㎜(length) 13,825㎜(width) * 376㎜(height). MARC and MENTAT are used as pre and post processor and solver.
The boundary conditions based on the real situation in shipyard is applied in simulations. Natural convection and gravity is taken into consideration. The material of the thin block is mild steel with 235N/㎟ yield strength. Its nonlinearity of conductivity, specific heat, young’s modulus and yield strength is considered in simulations. Welding in simulations is done in two pass. First pass lasts 2,100 second, then it rests for 900 second, then second pass lasts 2,100 second and then it rests for 20,000 second.
The displacement at 0 sec is caused by its own weight. It is maximum 19㎜ at the free side. The welding line expands, shrinks during welding and finally experiences shrinkage. It results in angular distortion of thin block. Final maximum displacement, 17㎜ occurs around welding line. The maximum residual stress happens at the welding line, where the stress is above the yield strength. Also, the maximum equivalent plastic strain occurs at the welding line. The plastic strain of first pass is more than that of second pass.
The flatness of plate in longitudinal direction is calculated in parallel with the direction of girder and compared with deformation standard of ±15㎜. Computed value is within the standard range. The flatness of plate in transverse direction is figured out in perpendicular to the direction of girder and compared with deformation standard of ±6㎜. It satisfies the standard. Buckle of plate is considered between each longitudinal and compared with the deformation standard. All buckle value is within the standard range of ±6㎜.
목차
Abstract
1. Introduction
2. Analysis Model
3. Analysis Result of Welding Deformation
4. Analysis of Deformation standard
5. Conclusions
References
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UCI(KEPA) : I410-ECN-0101-2009-581-019155941