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.

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%.

Finite Element Analysis of Temperature Filed and Stress Field of Reducer

2014 ◽  
Vol 881-883 ◽  
pp. 1447-1450
Author(s):  
Jing Zhang ◽  
Fei Wang
Keyword(s):  
Residual Stress ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Temperature Field ◽  
Stress Field ◽  
Residual Stress Field ◽  
Element Analysis ◽  
Welding Temperature ◽  
Stress And Deformation ◽  
Residual Stress And Deformation

Abstract.The connection mode of reducer with straight tube on both sides are the welding connection. There are two weld at the both side of reducer and there has a great influence on residual stress and deformation in the process of welding . Based on the particularity of reducer welding, the paper is focus on the residual stress and deformation in the process of welding, using large-scale finite element analysis software ANSYS .The DN500X450 reducer model is established.The welding temperature field and residual stress field is analysis and calculation and analysis the influence on temperature and stress distribution of reducer. The results show that the maximum of the temperature and the residual stress is located in the big side and reduce the welding seam, and the obvious deformation also find in the big side and reduce joint . The reducing pipe’s distribution of temperature field and residual stress field are obtained,providing the basis to establish properly and optimize of welding process.

Effects of Preheat and Interpass Temperature on the Residual Stress and Distortion on the T-Joint Weld

2014 ◽  
Author(s):  
Guangming Fu ◽  
Marcelo Igor Lourenço ◽  
Menglan Duan ◽  
Segen F. Estefen
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Element Model ◽  
Source Model ◽  
Fe Model ◽  
Heat Source Model ◽  
Stress And Deformation ◽  
The Finite Element Model ◽  
Residual Stress And Deformation ◽  
Interpass Temperature

The finite element model of ABAQUS combined with FORTRAN subroutines was developed to predict the residual stress and deformation of T-joint welds under different preheat and inter-pass temperature. A calibrated and sequentially coupled thermal and mechanical 3D finite element (FE) model is developed, and Goldak’s double ellipsoidal heat source model is implemented into the numerical model. The welding induced imperfections, including the residual stress and distortion are discussed in this paper. The results show that vertical deformation depend significantly on the preheat temperature and inter-pass temperature. The influences of preheat and interpass temperature on the residual stress are not significant.

scholarly journals Finite Element Prediction of Residual Stress and Deformation Induced by Double-Pass TIG Welding of Al 2219 Plate

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2251 ◽  
Author(s):  
Abdulrahaman Shuaibu Ahmad ◽  
Yunxin Wu ◽  
Hai Gong ◽  
Lin Nie
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Source Model ◽  
Tig Welding ◽  
Welding Residual Stress ◽  
Fe Model ◽  
Double Pass ◽  
Mechanical Boundary Condition ◽  
Stress And Deformation ◽  
Residual Stress And Deformation

Finite element (FE) analysis of welding residual stress and deformation is one of the essential stages in the manufacturing process of mechanical structures and parts. It aids in reducing the production cost, minimizing errors, and optimizing the manufactured component. This paper presents a numerical prediction of residual stress and deformation induced by two-pass TIG welding of Al 2219 plates. The FE model was developed using ABAQUS and FORTRAN packages, Goldak’s heat source model was implemented by coding the nonuniform distributed flux (DFLUX) in user subroutine to represent the ellipsoidal moving weld torch, having front and rear power density distribution. Radiation and convection heat losses were taken into account. The mechanical boundary condition was applied to prevent the model from rotation and displacement in all directions while allowing material deformation. The FE model was experimentally validated and the compared results show good agreement with average variations of 18.8% and 17.4% in residual stresses and deformation, respectively.

Numerical Analysis on the Cure-Induced Deformation of Fiber Composite Laminates

2013 ◽  
Vol 575-576 ◽  
pp. 183-187
Author(s):  
Pan Li ◽  
Yu Xi Jia
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Composite Laminates ◽  
Fiber Composite ◽  
Viscoelastic Model ◽  
Resin Matrix ◽  
Elastic Model ◽  
Matrix Composites ◽  
Stress And Deformation ◽  
Residual Stress And Deformation

During the cure process of fiber reinforced resin matrix composites, the residual stress and deformation can be generated. The cure-dependent elastic model, which is the earliest constructed and the simplified form of the viscoelastic model, is most universally applied to the finite element analysis on the cure-induced deformation. However, stress relaxation and creep are the unique properties of resin matrix composites, which can affect the residual stress and deformation in some degrees. In this study, both the elastic model and the viscoelastic model were used to predict the residual stress and deformation of fiber composite laminates by means of the finite element method, and then a comparison between them was made. The results show that the difference between them decreases with the increase of fiber volume fraction or the decrease of resin curing shrinkage.

scholarly journals Effect of welding sequence on residual stress and deformation of Mg alloy fillet welds

2020 ◽  
Vol 1635 ◽  
pp. 012032
Author(s):  
Naiwen Fang ◽  
Liansheng Li ◽  
Ruisheng Huang ◽  
Hao Cao ◽  
Kaixin Xu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Mg Alloy ◽  
Fillet Welds ◽  
Welding Sequence ◽  
Stress And Deformation ◽  
Residual Stress And Deformation
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