Simulation of Nonlinear Heat Transfer and Residual Stress for Multi-Pass Welding

2010 ◽  
Author(s):  
Hong Li ◽  
Hongliang Li ◽  
Xiang Gao ◽  
Yongliang Ni
Keyword(s):  
Numerical Simulation ◽  
Welding Process ◽  
Base Plate ◽  
Transient Temperature ◽  
Time Dynamic ◽  
Transient Temperature Field ◽  
Welding Line ◽  
Welding Sequences ◽  
Temperature Dependent Properties ◽  
Girth Welds

Welding residual plastic strains and stresses of welded structures are complicated and they will cause errors during the assembly of the structure and reduce the strength of the structure. Based on an elastic-plastic-model, a 3D finite element numerical simulation of a representative penetration assembly with loop welding line is carried out in this paper. The method of join for penetration structure and base plate is multi-pass welding. The transient temperature field and the real-time dynamic stresses field of the structure are obtained due to different welding sequences during multi-pass welding. In the process of analysis, the heat source is modeled as a moving heat flux along girth welds following a double ellipsoid distribution and the temperature-dependent properties of materials are considered. Being compared with the analysis results of other’s and the theory study, which provide instruction to the numerical simulation of welding process on similar components, the simulated results show mostly conformity.

Analysis of Nonlinear Heat Transfer and Residual Stresses during Multi-Pass Welding of Penetration Assembly

2009 ◽  
Vol 417-418 ◽  
pp. 149-152 ◽  
Author(s):  
Hong Li ◽  
Li Li
Keyword(s):  
Residual Stresses ◽  
Three Dimensional ◽  
Transient Temperature ◽  
Butt Welding ◽  
Time Dynamic ◽  
Transient Temperature Field ◽  
Dimensional Finite Element ◽  
Nonlinear Transient ◽  
Girth Welds ◽  
Three Dimensional Finite Element

Welding residual plastic strains and stresses cause errors during the assembly and reduce the strength of the structure. Based on an elastic-plastic-model, a three-dimensional finite element numerical simulation of multi-pass butt welding of a representative penetration assembly is carried out in this paper. The nonlinear transient temperature field and the real-time dynamic stresses field during multi-pass butt welding with girth welds are obtained. In the end, the residual stresses of the complicated stainless steel penetration structure are calculated by FEM software ANSYS.

Numerical Simulation of Spot Welding Galvanized Sheet with Insert Material

2012 ◽  
Vol 557-559 ◽  
pp. 2274-2278
Author(s):  
Ge Wang Shuai ◽  
Ping Fang ◽  
Zheng Hua Guo
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Mechanical Model ◽  
Spot Welding ◽  
Welding Process ◽  
Transient Temperature ◽  
Stress Distributions ◽  
Copper Strip ◽  
Transient Temperature Field ◽  
Welding System

In this paper, with the ANSYS, a 2D axisymmetric coupled thermo-electro-mechanical model was developed to analyze the spot welding process（RSW） of zinc coated steels with copper strips as an insert material between electrode and workpiece. A transient temperature field obtained from a prior performed thermal–electrical simulation of RSW process is applied as nodal load on the model to simulate the stress distribution. The temperature and stress distributions in such a welding process were obtained and compared with a conventional resistance spot welding process. The results show that using the same welding process parameters, the maximum transient temperature at the electrode surface is lower than the conventional RSW process due to the use of copper strips, which helps to extend electrode lifetime. In addition, the presence of inserted copper strip increased the resistance of welding system, thus generated much more heat to form larger nugget.

scholarly journals Research on Model Slice and Forming Method of Thin-walled Parts

2021 ◽  
Vol 233 ◽  
pp. 04046
Author(s):  
Changhao Zhang ◽  
Hu Li ◽  
Jianyu Yang ◽  
Huawei Lu ◽  
Peng Su
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Structural Characteristics ◽  
Three Dimensional ◽  
Simulation Method ◽  
Processing Parameters ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Thin Walled ◽  
Experimental Processing

According to the structural characteristics of thin-walled parts, a model slicing method is proposed, and its mathematical process is established. The three-dimensional transient temperature field in the process of synchronous powder feeding laser cladding is studied and verified by numerical simulation method, and the thin-walled parts formed by later experimental processing are processed by the results of numerical simulation. Using the simulation results of temperature field as the basis for optimizing the processing parameters, the forming path of thin-walled parts is programmed and optimized, and the experimental verification shows the reliability of this method.

Numerical Simulation of Welding Distortion under Different Sequences

2011 ◽  
Vol 328-330 ◽  
pp. 638-641 ◽  
Author(s):  
Yang Liu ◽  
Dong Po Wang ◽  
Hai Zhang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Welding Process ◽  
Welding Distortion ◽  
Finite Element Software ◽  
Reasonable Number ◽  
Welding Sequences

Finite element software ANSYS was used to study the influence of welding sequences on the distortion generated in the welding process of a Q345 plate with V-groove. The simulation of the welding process consists of sequentially coupled thermal and structural analyses using element birth and death technique. The results show that the backstep welding makes the distortion decrease. But back welding with too many steps makes the distortion increase. For a structure, the most reasonable number of steps can be found.

Research on Gradient Heat Treatment of Dual-Property Disk for Alloy FGH96

2013 ◽  
Vol 747-748 ◽  
pp. 783-787
Author(s):  
Yu Wang ◽  
Jin Wen Zou ◽  
Guo Qing Zhang ◽  
Wu Xiang Wang
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Treatment ◽  
Transient Temperature ◽  
Heating Process ◽  
Fixture Design ◽  
Dual Property ◽  
Transient Temperature Field ◽  
Heat Treated ◽  
Treatment Experiment

The transient temperature field in the dual-property disk of alloy FGH96 was investigated during the solution heating process of the gradient heat treatment by numerical simulation. The temperature curves for the different locations of the disk were attained. Then, the gradient heat treatment experiment was carried out, and the heat profiles were obtained. The numerical and the experimental results were almost consistent. The method of heat transfer for the bore of the disk was changed evidently through effective fixture design during the gradient heat treatment. The gradient of temperature (ΔT) can reach 121 or more, which lead to a supersolvus heat treated rim and subsolvus heat treated bore for the disk.

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