Numerical Simulation for Residual Stress and Deformation of Surface Welding on Membrane Water-Wall

2014 ◽  
Vol 490-491 ◽  
pp. 594-599
Author(s):  
Fan Ling Meng ◽  
Ai Guo Liu
Keyword(s):  
Residual Stress ◽  
Great Influence ◽  
Residual Deformation ◽  
Welding Residual Stress ◽  
Finite Element Software ◽  
Welding Sequence ◽  
Surface Welding ◽  
Stress And Deformation ◽  
Welding Sequences ◽  
Residual Stress And Deformation

Automatic MIG was adopted to weld Inconel 625 alloy on 20 G Membrane Waterwall, which can improve the capacities of high temperature corrosion resistance and wear resistance. To study the influence of Membrane Waterwall surface welding sequences on residual stress and residual deformation, this paper utilized finite element software ABAQUS and segmented moving heat source model to simulate the sequence welding, balanced welding from the middle to sides, balanced welding from sides to the middle, balanced skip welding from middle to sides and balanced skip welding from sides to the middle and studied their residual stresses and deformations. The simulation results indicated that there was a great influence of welding sequences on the residual stress and deformation. The optimal welding sequence was balanced skip welding from middle to sides and balanced skip welding from sides to the middle, which could change the stress distribution, decrease the welding residual stress by 17%, realize the even deformation of the whole welding section and decrease the bending deformation by 50%.

Welding Residual Stress and Deformation of Full and Partial Penetration Laser Welded Lap Joints

2020 ◽  
Vol 47 (5) ◽  
pp. 0502005
Author(s):  
郭相忠 Guo Xiangzhong ◽  
刘伟 Liu Wei ◽  
范佳斐 Fan Jiafei ◽  
李喜庆 Li Xiqing ◽  
胡立国 Hu Liguo
Keyword(s):  
Residual Stress ◽  
Lap Joints ◽  
Welding Residual Stress ◽  
Partial Penetration ◽  
Stress And Deformation ◽  
Residual Stress And Deformation

Research of Weld on Axial Buckling Stress of Multilayer Combined Cylindrical Shells

2010 ◽  
Author(s):  
Chulin Yu ◽  
Zhiping Chen ◽  
Licai Yang
Keyword(s):  
Residual Stress ◽  
Critical Stress ◽  
Buckling Analysis ◽  
Welding Residual Stress ◽  
Analysis Method ◽  
Axial Buckling ◽  
Oil Tank ◽  
Stress And Deformation ◽  
Oil Tanks ◽  
Residual Stress And Deformation

Large welded steel tanks for oil storage (oil tank for short in following text) are usually constructed by welding together several varying thickness cylindrical shells. The generated welding residual stress and deformation may affect the buckling behavior of oil tanks. Learning the influence of welding residual stress and deformation on axial buckling helps accounting for discrepancy between elephant’s foot buckling critical stress and classic theoretical solution. A buckling analysis method considering welding residual stress and deformation is established. Inherent strain finite element method is illustrated as the proper method to simulate welding residual stress and deformation in buckling analysis and its detail setting procedures in ABAQUS are given. A small model cylinder is analyzed under three conditions (one circumferential weld only, one meridian weld only, and one circumferential weld with two meridian welds), leading to several important conclusions. One of these conclusions is that the extent to which welding residual stress and deformation reduces axial buckling critical stress depends on the weld type greatly. Then the established buckling analysis method is applied to an actual oil tank with patterned welds. Result shows that patterned welds decrease axial buckling critical stress significantly. At last several recommendations are given to decrease the effect of welding residual stress and deformation on axial buckling of oil tanks.

Control of Welding Residual Stress and Deformation of the Butt Welded Ultrathick Tube-Sheet: Effect of Applied Load

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Wenchun Jiang ◽  
J. M. Gong ◽  
Wanchuck Woo ◽  
Y. F. Wang ◽  
S. T. Tu
Keyword(s):  
Residual Stress ◽  
Large Scale ◽  
Applied Load ◽  
Deformation Mode ◽  
Welding Residual Stress ◽  
Tube Sheet ◽  
Heavy Load ◽  
Angular Deformation ◽  
Stress And Deformation ◽  
Residual Stress And Deformation

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 × 104 to 45 × 104 kg, the deformation decreases but the residual stress increases. When the load is beyond 45 × 104 kg, the deformation mode is changed from angular deformation to arch deformation. An optimized load of 45 × 104 kg 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.

scholarly journals FEM Research on Welding Thermal Deformation of Copper Alloy Sheet and Optimization of Welding Sequence

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1287
Author(s):  
Mingxin Yuan ◽  
Suodong Liu ◽  
Hongwei Sun ◽  
Yunqiang Gao ◽  
Xianling Dai ◽  
...  
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Base Metal ◽  
Copper Alloy ◽  
Thermal Deformation ◽  
Alloy Sheet ◽  
Welding Sequence ◽  
Change Trend ◽  
Stress And Deformation ◽  
Residual Stress And Deformation

To reduce the residual stress and deformation of the copper alloy sheet after welding, and improve the welding quality of the copper alloy sheet, the finite element method (FEM) research on welding thermal deformation and welding sequence optimization was carried out. First, a finite element model of copper alloy sheet welding was established based on ANSYS, the mechanical property parameters of the model at high temperature were determined, and the thermal–structural coupling calculation was performed on the model. Then, the change trend and magnitude of the residual stress and deformation of the model after welding were analyzed. Finally, different welding sequence schemes were designed, and numerical simulation calculations were carried out. The results of the welding sequence solution show that the change trend of the residual stress after welding of the base metal under different welding sequences is basically the same; repeated heating of the base metal at the same position causes large residual stress; the weldment vertical plate is subjected to opposing forces in the x-axis and y-axis directions at the same time. Among four welding schemes, the welding scheme that alternately welds symmetrically from the start and end positions of the weld seam to the middle position of the plate causes the least welding deformation. Compared with the other three schemes, its deformation reduces by 26.6%, 18.3%, and 19.4%, respectively.

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