Control of Welding Residual Stress and Deformation of the Butt Welded Ultrathick Tube-Sheet: Effect of Applied Load
Control of Welding Residual Stress and Deformation of the Butt Welded Ultrathick Tube-Sheet: Effect of Applied Load
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DOI：
10.1115/1.4007037
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发表时间：
2012-12
影响因子：
1
通讯作者：
Wenchun Jiang;J. Gong;W. Woo;Yanfei Wang;S. Tu
中科院分区：
文献类型：
--
作者：
Wenchun Jiang;J. Gong;W. Woo;Yanfei Wang;S. Tu
Residual stresses and deformation in the butt welding of an ultrathick tube-sheet in a large scale reactor are predicted by finite element method. The effect of applied load on residual stress and deformation has been discussed. When the tube-sheet is welded without any constraint and applied load, large angular deformation is generated due to the large amount of heat input, the nonuniform temperature distribution, and shrinkage. In order to decrease the angular deformation, a heavy load is applied at both ends of tube-sheet. With the applied load increase from 5 × 104to 45 × 104kg, the deformation decreases but the residual stress increases. When the load is beyond 45 × 104kg, the deformation mode is changed from angular deformation to arch deformation. An optimized load of 45 × 104kg is determined. The zone of peak residual stress is increased as the applied load increases. Too heavy a load generates a serious constraint on deformation, which in turn leads to higher residual stress.
