Temperature Influence on Microstructure and Properties Evolution of Friction Stir Welded Al-Mg-Si Alloy

2019 ◽  
Vol 822 ◽  
pp. 122-128 ◽  
Author(s):  
Anton Naumov ◽  
Iuliia Morozova ◽  
Fedor Y. Isupov ◽  
Iurii Golubev ◽  
Veselin Mikhailov
Keyword(s):  
Finite Element ◽  
Friction Stir Welding ◽  
Finite Element Model ◽  
Microstructure Evolution ◽  
Element Model ◽  
Temperature Influence ◽  
Nugget Zone ◽  
3D Finite Element ◽  
Friction Stir ◽  
Microhardness Profile

The temperature influence on the microstructure evolution and microhardness of the age-hardenable aluminium alloy 6082 T6 during friction stir welding was defined. In order to achieve this aim, the thermocycles calculated using the developed 3D Finite Element Model were physically simulated on the Gleeble-3800 in the points which located in the different zones of the weld. The microstructure in the chosen points after Gleeble testing was investigated as well as the microhardness was measured. The results were consequently compared with the relevant results obtained after friction stir welding. It was shown that the microstructure and microhardness profile are influenced not only by temperature but by deformation. The increase in hardness in different zones after FSW compared to Gleeble testing can be explained by the grain refinement in the nugget zone as well as the hardening precipitate distribution along the weld which can occur more rapidly due to the deformation influence.

scholarly journals Numerical Simulation of Material Flow and Analysis of Welding Characteristics in Friction Stir Welding Process

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 621 ◽  
Author(s):  
Haitao Luo ◽  
Tingke Wu ◽  
Peng Wang ◽  
Fengqun Zhao ◽  
Haonan Wang ◽  
...  
Keyword(s):  
Finite Element ◽  
Friction Stir Welding ◽  
Finite Element Model ◽  
Material Flow ◽  
Welding Process ◽  
Element Model ◽  
Welding Seam ◽  
Friction Stir ◽  
Tool Pin ◽  
The Finite Element Model

Friction stir welding (FSW) material flow has an important influence on weld formation. The finite element model of the FSW process was established. The axial force and the spindle torque of the welding process were collected through experiments. The feasibility of the finite element model was verified by a data comparison. The temperature field of the welding process was analyzed hierarchically. It was found that the temperature on the advancing side is about 20 °C higher than that on the retreating side near the welding seam, but that the temperature difference between the two sides of the middle and lower layers was decreased. The particle tracking technique was used to study the material flow law in different areas of the weld seam. The results showed that part of the material inside the tool pin was squeezed to the bottom of the workpiece. The material on the upper surface tends to move downward under the influence of the shoulder extrusion, while the material on the lower part moves spirally upward under the influence of the tool pin. The material flow amount of the advancing side is higher than that of the retreating side. The law of material flow reveals the possible causes of the welding defects. It was found that the abnormal flow of materials at a low rotation speed and high welding speed is prone to holes and crack defects. The forming reasons and material flow differences in different regions are studied through the microstructure of the joint cross section. The feasibility of a finite element modeling and simulation analysis is further verified.

scholarly journals A Finite Element Model to Simulate Defect Formation during Friction Stir Welding

Metals ◽  
2017 ◽  
Vol 7 (7) ◽  
pp. 256 ◽  
Author(s):  
Zhi Zhu ◽  
Min Wang ◽  
Huijie Zhang ◽  
Xiao Zhang ◽  
Tao Yu ◽  
...  
Keyword(s):  
Finite Element ◽  
Friction Stir Welding ◽  
Finite Element Model ◽  
Defect Formation ◽  
Element Model ◽  
Friction Stir

scholarly journals Prediction of friction stir welding effects on AA2024-T3 plates and stiffened panels using a shell-based finite element model

2017 ◽  
Vol 120 ◽  
pp. 297-306 ◽  
Author(s):  
R.M.F. Paulo ◽  
P. Carlone ◽  
V. Paradiso ◽  
R.A.F. Valente ◽  
F. Teixeira-Dias
Keyword(s):  
Finite Element ◽  
Friction Stir Welding ◽  
Finite Element Model ◽  
Element Model ◽  
Stiffened Panels ◽  
Friction Stir

3D Finite Element Simulation for Turning of Hardened 45 Steel

2019 ◽  
Vol 13 (2) ◽  
pp. 181-188
Author(s):  
Meng Liu ◽  
Guohe Li ◽  
Xueli Zhao ◽  
Xiaole Qi ◽  
Shanshan Zhao
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Cutting Force ◽  
Finite Element Simulation ◽  
Orthogonal Experiment ◽  
Element Model ◽  
3D Finite Element ◽  
Element Simulation ◽  
Metal Machining ◽  
Single Factor Experiment

Background: Finite element simulation has become an important method for the mechanism research of metal machining in recent years. Objective: To study the cutting mechanism of hardened 45 steel (45HRC), and improve the processing efficiency and quality. Methods: A 3D oblique finite element model of traditional turning of hardened 45 steel based on ABAQUS was established in this paper. The feasibility of the finite element model was verified by experiment, and the influence of cutting parameters on cutting force was predicted by single factor experiment and orthogonal experiment based on simulation. Finally, the empirical formula of cutting force was fitted by MATLAB. Besides, a lot of patents on 3D finite element simulation for metal machining were studied. Results: The results show that the 3D oblique finite element model can predict three direction cutting force, the 3D chip shape, and other variables of metal machining and the prediction errors of three direction cutting force are 5%, 9.02%, and 8.56%. The results of single factor experiment and orthogonal experiment are in good agreement with similar research, which shows that the model can meet the needs for engineering application. Besides, the empirical formula and the prediction results of cutting force are helpful for the parameters optimization and tool design. Conclusion: A 3D oblique finite element model of traditional turning of hardened 45 steel is established, based on ABAQUS, and the validation is carried out by comparing with experiment.

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