scholarly journals Microstructure and Properties of Friction Stir Welded 2219 Aluminum Alloy under Heat Treatment and Electromagnetic Forming Process

Metals ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 305 ◽  
Author(s):  
Zeyu Wang ◽  
Liang Huang ◽  
Jianjun Li ◽  
Xiaoxia Li ◽  
Hui Zhu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
Electromagnetic Forming ◽  
Forming Process ◽  
Friction Stir ◽  
Microstructure And Properties ◽  
2219 Aluminum Alloy

scholarly journals Microstructure and Properties of 2219 Aluminum Alloy under Compound Technologies of Friction-Stir-Welding, Heat-Treatment and Electromagnetic Forming

2018 ◽  
Author(s):  
Zeyu Wang ◽  
Liang Huang ◽  
Jianjun Li ◽  
Xiaoxia Li ◽  
Hui Zhu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Large Scale ◽  
Electromagnetic Forming ◽  
Forming Limit ◽  
Thin Wall ◽  
Processing Technologies ◽  
Friction Stir ◽  
2219 Aluminum Alloy

Among all the processing technologies of heat-treatable aluminum alloys like 2219 aluminum alloy, using friction stir welding (FSW) as the joining technology and using electromagnetic forming (EMF) for plastic forming technology both have obvious advantages and successful applications. Therefore, there is a broad prospect for the compound technologies which can be used on the 2219 aluminum alloy to manufacture the large-scale thin-wall parts in the astronautic industry. The microstructure and mechanical properties of 2219 aluminum alloy under the process compounded of FSW, heat treatment, and EMF were investigated by means of tensile test, optical microscope (OM), and scanning electron microscope (SEM). The results show that the reduction of strength, which was caused during the FSW process, can be recovered effectively by the post-welding heat treatment composed of solid solution and aging, while the ductility was still reduced after heat treatment. Under the compound technology of FSW, heat treatment, and EMF, the forming limit of 2219 aluminum alloy decreased distinctly due to the poor ductility of the welding joint. A ribbon-pattern, which was formed due to the banded structure caused by FSW process, was found on the fracture surface of welded 2219 aluminum alloy after EMF treatment. During the EMF process, because of the effects of induced eddy current, a unique structure, which was manifested as a molted-surface appearance under the SEM observation, was formed as the material fractured.

scholarly journals Study on Quality Prediction of 2219 Aluminum Alloy Friction Stir Welding Based on Real-Time Temperature Signal

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3496
Author(s):  
Haijun Wang ◽  
Diqiu He ◽  
Mingjian Liao ◽  
Peng Liu ◽  
Ruilin Lai
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Prediction Model ◽  
Real Time ◽  
Support Vector ◽  
Weld Quality ◽  
Prediction Ability ◽  
Friction Stir ◽  
Temperature Signal ◽  
2219 Aluminum Alloy

The online prediction of friction stir welding quality is an important part of intelligent welding. In this paper, a new method for the online evaluation of weld quality is proposed, which takes the real-time temperature signal as the main research variable. We conducted a welding experiment with 2219 aluminum alloy of 6 mm thickness. The temperature signal is decomposed into components of different frequency bands by wavelet packet method and the energy of component signals is used as the characteristic parameter to evaluate the weld quality. A prediction model of weld performance based on least squares support vector machine and genetic algorithm was established. The experimental results showed that, when welding defects are caused by a sudden perturbation during welding, the amplitude of the temperature signal near the tool rotation frequency will change significantly. When improper process parameters are used, the frequency band component of the temperature signal in the range of 0~11 Hz increases significantly, and the statistical mean value of the temperature signal will also be different. The accuracy of the prediction model reached 90.6%, and the AUC value was 0.939, which reflects the good prediction ability of the model.

Effect of Pre-Strain Rolling on Annealing Behavior of Friction-Stir Welded AA6061-T6 Aluminum Alloy

2018 ◽  
Vol 385 ◽  
pp. 355-358 ◽  
Author(s):  
Sergey Mironov ◽  
Sergey Malopheyev ◽  
Igor Vysotskiy ◽  
Daria Zhemchuzhnikova ◽  
Rustam Kaibyshev
Keyword(s):  
Heat Treatment ◽  
Thermal Stability ◽  
Aluminum Alloy ◽  
Cold Rolling ◽  
Grain Growth ◽  
Rolling Schedule ◽  
Annealing Behavior ◽  
Friction Stir ◽  
Welding Direction ◽  
Thermal Stability Of

In this work, the effect of pre-strain cold rolling on thermal stability of friction-stir welded AA6061-T6 alloy was studied. The pre-strain rolling was found to be very effective in suppression of abnormal grain growth during standard post-weld T6 heat treatment. It was also shown that the efficiency of this approach essentially depends on rolling path and the rolling along welding direction was the most effective rolling schedule.

Effect of Combined Electromagnetic Fields on Microstructure and Properties of Large-Sized Ingot of 2219 Aluminum Alloy

2020 ◽  
Vol 993 ◽  
pp. 287-293
Author(s):  
Hao Dong Zhao ◽  
Zhi Feng Zhang ◽  
Yang Qiu ◽  
Bao Li ◽  
Ming Wei Gao
Keyword(s):  
Grain Size ◽  
Aluminum Alloy ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Electromagnetic Fields ◽  
Casting Process ◽  
Microstructure And Properties ◽  
Aluminum Ingot ◽  
2219 Aluminum Alloy ◽  
Dc Casting

Large-sized 2219 aluminum alloy ingot has wide application prospect in aerospace and military fields. Severe defects, such as coarse grain, the inhomogeneity of structure and macrosegregation occurred in large-sized aluminum ingot produced by normal DC casting. The application of a single magnetic field in DC casting process cannot solve these defects. In this paper, a new method with the combination of electromagnetic fields imposed on bulk melt treatment during DC casting was proposed. And a φ508 mm ingot of 2219 aluminum alloy was prepared in this method. Compared with the normal DC casting, the effect of the combined electromagnetic fields on the microstructure and properties was studied. The experimental results demonstrate that the application of the combined electromagnetic fields significantly refines the grains, and the grain size distribution on the cross section of the ingot tends to be more uniform as well as the mechanical properties are significantly improved. The microstructure and grain size distribution can be significantly affected by different combined electromagnetic fields. It is considered that the appropriate combined electromagnetic fields parameters play an important role in controlling the homogeneity of large-sized ingots.

Mechanical properties of electric assisted friction stir welded 2219 aluminum alloy

2019 ◽  
Vol 44 ◽  
pp. 197-206 ◽  
Author(s):  
Shujun Chen ◽  
Hongwei Zhang ◽  
Xiaoqing Jiang ◽  
Tao Yuan ◽  
Yang Han ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Friction Stir ◽  
2219 Aluminum Alloy

Geometric issues in V-bending electromagnetic forming process of 2024-T3 aluminum alloy

2015 ◽  
Vol 19 ◽  
pp. 171-182 ◽  
Author(s):  
Weiren Xiong ◽  
Wenping Wang ◽  
Min Wan ◽  
Xinjun Li
Keyword(s):  
Aluminum Alloy ◽  
Electromagnetic Forming ◽  
Forming Process
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