Study on Distributed Properties of Welding Residual Stress in Bridge Nodes

2014 ◽  
Vol 501-504 ◽  
pp. 1166-1169
Author(s):  
Jia Liu ◽  
Run Chang Zhang ◽  
Wei Lian Qu ◽  
Li Jiang
Keyword(s):  
Residual Stress ◽  
Three Dimensional ◽  
Element Model ◽  
Source Model ◽  
Welding Residual Stress ◽  
Welding Parameters ◽  
Heat Source Model ◽  
Lateral Direction ◽  
Welding Procedure ◽  
Welding Direction

The distributed properties of residual stress in bridge nodes have been investigated in the paper. Based on some bridge node, the three dimensional thermodynamics finite element model has been established, meanwhile, the double ellipsoidal distributed heat source model are used to simulate the whole welding procedure of bridge nodes according to the welding parameters. Thus, the distributed regularities of residual stress of bridge node have been obtained. Simulating results show that the residual stresses distribute uniformly in the welding direction, and the max value reaches the yield strength of steel Q345qD. Besides, the residual stress in the lateral direction reaches the max value in the place of welding district, and decreases rapidly when far away from the welds.

scholarly journals Study on Residual Stress of Welded Hoop Structure

2020 ◽  
Vol 10 (8) ◽  
pp. 2838
Author(s):  
Wenbo Ma ◽  
Heng Zhang ◽  
Wei Zhu ◽  
Fu Xu ◽  
Caiqian Yang
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Welding Speed ◽  
Weld Seam ◽  
Outer Cylinder ◽  
Three Dimensional ◽  
Welding Residual Stress ◽  
Welding Parameters ◽  
Forming Process ◽  
Maximum Residual Stress

Residual stress is inevitable during welding, which will greatly affect the reliability of the structure. The purpose of this paper was to study the residual stress of the hoop structure caused by the cooling shrinkage of the weld when the outer cylinder was wrapped and welded under the condition of the existing inner cylinder. In this paper, the “method of killing activating elements” of ANSYS was used to simulate the three-dimensional finite element of the hoop structure. In the case of applying interlayer friction, the welding-forming process and welding circumferential residual stress of the hoop structure were analyzed. The blind hole method was used to test the residual stress distribution of the hoop structure, and the test results were compared with the finite element simulation results to verify the reliability of the simulation calculation method and the reliability of the calculation results. Then, the influence factors of the maximum welding residual stress of the hoop structure were studied. The results show that the maximum residual stress of the outer plate surface of the hoop structure decreases with the increase of the welding energy, the thickness of the laminate, the width of the weld seam, the welding speed, and the radius of the container. Based on the results of numerical simulation, the ternary first-order equations of the maximum residual stress of the hoop structure with respect to the welding speed, the thickness of the laminate, and the width of the weld seam were established. Then, the optimal welding parameters were obtained by optimizing the equations, which provided an important basis for the safe use and optimal design of the welding hoop structure.

scholarly journals EFFECTS OF WELDING CURRENT AND SPEED ON RESIDUAL STRESS AND DISTORTION OF JOINING ST52 ROLLED PLATE IN DIFFERENT WELDING SEQUENCES

2020 ◽  
Vol 3 (2) ◽  
pp. 40-45
Author(s):  
Ali Aminifar ◽  
Alireza M. Haghighi
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Three Dimensional ◽  
Welding Current ◽  
Element Model ◽  
Rolled Plate ◽  
Main Step ◽  
Welding Parameters ◽  
Effective Parameters ◽  
Welding Sequences

Welding is a process of permanent joining parts by different welding methods. Residual stress and distortion are the most common phenomena of this process. Reduction of the residual stresses, distortion and improving the quality of welding are the important subjects of this field. Determining and analyzing the residual stresses and distortion is the main step for these purposes. Welding sequences, speed and current are the most effective parameters of this process. In this study, effects of welding parameters such as welding speed and current, in order to reduce residual stress and distortion of welding ST52 rolled plate in different welding sequences have been studied with three-dimensional thermo-mechanical finite element model by means of ANSYS APDL. By comparing different considered situations, the most efficient welding methods with the least residual stress and distortion by considering different welding sequences have been suggested. It obtains that welding the ST52 rolled plate from edge to edge with higher current and lower speed is the best option in fatigue and load-bearing situations, and welding from the center to both sides simultaneously with lower current and higher speed is the best option for assembly problems.

Research on Vibration Responses of Railway Steel Bridge Considering Welding Residual Stress

2013 ◽  
Vol 397-400 ◽  
pp. 374-377 ◽  
Author(s):  
Jia Liu ◽  
Run Chang Zhang ◽  
Li Jiang ◽  
Zhong Shan He ◽  
Dong Mei Tan
Keyword(s):  
Residual Stress ◽  
Element Model ◽  
Source Model ◽  
Welding Residual Stress ◽  
Steel Bridge ◽  
Model Matching ◽  
Electrical Arc ◽  
Vibration Responses ◽  
Welding Joints ◽  
Dynamical Stress

Vibration responses of railway steel bridge considering welding residual stress have been researched. Based on the reasonable heat source model matching the electrical arc welding, the welding residual stress in welding joints of steel bridge has been simulated. Meanwhile, it has been superimposing with the gravity stress and the actual measured dynamical stress of railway steel bridge. Then, acting all actions to the accurate finite element model, the vibration responses of railway steel bridge considering welding residual stress can be analyzed, and the conclusion that the residual stress has a significant contribution to the vibration dynamical stress in welding joints district of railway steel bridge has been obtained.

Research on Influencing Factors of Welding Residual Stress of Welded Pipes

2014 ◽  
Vol 697 ◽  
pp. 293-297
Author(s):  
Lin Yue Bai ◽  
Ke Bin Jiang ◽  
Lei Gao ◽  
Jing Quan Wang
Keyword(s):  
Residual Stress ◽  
Three Dimensional ◽  
Element Model ◽  
General Purpose ◽  
Welding Residual Stress ◽  
Outer Diameter ◽  
Ansys Software ◽  
Element Analysis ◽  
Pipeline Welding ◽  
Dimensional Element

Analyzing the pipeline sheet of X70 level, the work also establishes three-dimensional element model of pipeline welding with ANSYS (software of large general purpose with finite element analysis). After comparing different plans, changes of outer diameter and wall thickness are found influencing distributing laws of welding residual stress of welded pipes. Thus, the laws are concluded.

Prediction of Weld Residual Stress in a PWR Pressurizer Surge Nozzle: A Proposed Fast Computational 3D Analysis Method and Influence of Its Heat Source Model

2012 ◽  
Author(s):  
Akira Maekawa ◽  
Atsushi Kawahara ◽  
Hisashi Serizawa ◽  
Hidekazu Murakawa
Keyword(s):  
Residual Stress ◽  
Heat Source ◽  
High Speed ◽  
Nuclear Regulatory Commission ◽  
Source Model ◽  
Round Robin ◽  
Welding Residual Stress ◽  
3D Analysis ◽  
Heat Source Model ◽  
Pressurized Water

Primary water stress corrosion cracking (PWSCC) generated in dissimilar metal welds is one of the safety issues in ageing pressurized water reactor piping systems. It is well known that analysis accuracy of cracking propagation due to PWSCC depends on welding residual stress conditions. The U.S. Nuclear Regulatory Commission carried out an international round robin program for welding residual stress analysis validation to evaluate the accuracy and uncertainty quantitatively. In this study, participation results in the round robin program were reported. The three-dimensional analysis based on a fast weld simulation using the Iterative Substructure Method was clarified to provide accurate results in a high-speed computation. Furthermore, the influence of different heat source models on analysis results was investigated. It was demonstrated that the residual stress and distortion calculated using the moving heat source model were more accurate.

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.

Numerical Simulation of the Prestressed Laser Welding of 7075－T7451 Aluminum Alloy Sheet

2010 ◽  
Vol 431-432 ◽  
pp. 13-16 ◽  
Author(s):  
Hong Feng Wang ◽  
Dun Wen Zuo ◽  
Hong Miao ◽  
Hong Jun Wang
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Welding Process ◽  
Source Model ◽  
Alloy Sheet ◽  
Welding Residual Stress ◽  
Aluminum Alloy Sheet ◽  
Heat Source Model ◽  
Element Simulation ◽  
Input Model

The heat source model and the heat input model were built by analyzing welding process. The rationalities of model were verified by finite element simulation. The method of prestressed welding was employed in order to reduce welding residual stress. The welding residual stress would be widely impacted by imposed prestress of 90% yield strength welding. At the same time the propagation of welding heat cracking in the heat-affected zone was properly controlled by prestressed welding.

Influences of heat source model on welding residual stress and distortion in a multi-pass J-groove joint

2009 ◽  
Vol 46 (4) ◽  
pp. 987-995 ◽  
Author(s):  
Shoichi Kiyoshima ◽  
Dean Deng ◽  
Kazuo Ogawa ◽  
Nobuyoshi Yanagida ◽  
Koichi Saito
Keyword(s):  
Residual Stress ◽  
Heat Source ◽  
Source Model ◽  
Welding Residual Stress ◽  
Heat Source Model

Estimation of Residual Stress in Spiral Welded Pipe: Regression and Numerical Model

2012 ◽  
Author(s):  
Abul Fazal M. Arif ◽  
Ahmad S. Al-Omari ◽  
Anwar K. Sheikh ◽  
Yagoub Al-Nassar ◽  
M. Anis
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Critical Role ◽  
Large Diameter ◽  
Element Model ◽  
Regression Equation ◽  
Field Analysis ◽  
Welding Parameters ◽  
Splitting Test ◽  
Welded Pipe

Double submerged spiral-welded pipe (SWP) is used extensively throughout the world for large-diameter pipelines. Fabrication-induced residual stresses in spiral welded pipe have received increasing attention in gas, oil and petrochemical industry. Several studies reported in the literature verify the critical role of residual stresses in the failure of these pipes. Therefore, it is important that such stresses are accounted for in safety assessment procedures such as the British R6 and BS7910. This can be done only when detailed information on the residual stress distribution in the component is known. In industry, residual stresses in spiral welded pipe are measured experimentally by means of destructive techniques known as Ring Splitting Test. In this study, statistical analysis and linear-regression modeling were used to study the effect of several structural, material and welding parameters on ring splitting test opening for spiral welded pipes. The experimental results were employed to develop an appropriate regression equation, and to predict the residual stress on the spiral welded pipes. It was found that the developed regression equation explains 36.48% of the variability in the ring opening. In the second part, a 3-D finite element model is presented to perform coupled-field analysis of the welding of spiral pipe. Using this model, temperature as well as stress fields in the region of the weld edges is predicted.

Effect of Welding Residual Stress on the Buckling Behavior of Storage Tanks Subjected to Harmonic Settlement

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Jian-Guo Gong ◽  
Lei Yu ◽  
Feng Wang ◽  
Fu-Zhen Xuan
Keyword(s):  
Residual Stress ◽  
Design Method ◽  
Welding Residual Stress ◽  
Welding Parameters ◽  
Strengthening Effect ◽  
Storage Tanks ◽  
Buckling Strength ◽  
Welding Joint ◽  
Buckling Behavior ◽  
Significant Difference

The effect of welding residual stress on the buckling behavior of storage tanks subjected to the harmonic settlement was simulated using the shell-to-solid coupling method. In the numerical model of tanks coupled with the welding residual stress, the welding joint and its adjacent zone were modeled using the solid submodel and the zone far away from the welding joint was built by the shell submodel. Effects of welding parameters (e.g., welding velocities and welding passes) on the buckling behavior of tanks were analyzed systematically. Results indicate that the buckling strength of tanks is enhanced due to the welding residual stress. Comparatively, a slow welding velocity presents a more remarkable strengthening effect than the fast welding velocity due to a larger axial residual stress produced at the welding joint. Nevertheless, no significant difference between the double-side welding and the one-side welding for buckling strength enhancement is observed for the cases studied. This indicates that the current design method causes a conservative design without considering the welding residual stress.

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