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.

Microstructure Evaluation on Friction Stir Welding of Cryorolled 2219 Aluminum Alloy

2018 ◽  
Vol 47 (4) ◽  
pp. 20170429
Author(s):  
K. Kamal Babu ◽  
K. Panneerselvam ◽  
P. Sathiya ◽  
A. Noorul Haq ◽  
S. Sundarrajan ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Friction Stir ◽  
Microstructure Evaluation ◽  
2219 Aluminum Alloy

scholarly journals Effect of Shot Peening on Redistribution of Residual Stress Field in Friction Stir Welding of 2219 Aluminum Alloy

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3169 ◽  
Author(s):  
Lin Nie ◽  
Yunxin Wu ◽  
Hai Gong ◽  
Dan Chen ◽  
Xudong Guo
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Stress Field ◽  
Shot Peening ◽  
Welding Residual Stress ◽  
Stress Fields ◽  
Residual Stress Field ◽  
Friction Stir ◽  
2219 Aluminum Alloy

Welding is one of the essential stages in the manufacturing process of mechanical structures. Friction stir welding structure of aluminum alloy has been used as a primary supporting member in aerospace equipment. However, friction stir welding inevitably generates residual stress that promotes the initiation and propagation of cracks, threatening the performance of the welded structure. Shot peening can effectively change the distribution of residual stress and improve the fatigue properties of materials. In this paper, friction stir welding and shot peening are performed on 2219 aluminum alloy plates. The residual stress fields induced by friction stir welding and shot peening are measured by using the X-ray diffraction method and incremental center hole drilling method, and the distribution characteristics of residual stress fields are analyzed. The effect of the pellet diameters and pellet materials used in shot peening on the redistribution of welding residual stress field are investigated. The pellet diameter used in the experiment is in the range of 0.6–1.2 mm, and the pellet material includes glass, steel, and corundum. This study provides guidance for the application of shot peening in friction stir welding structure of 2219 aluminum alloy.

Investigation on the Effects of Welding Speed on Bobbin Tool Friction Stir Welding of 2219 Aluminum Alloy

2019 ◽  
Vol 26 (12) ◽  
pp. 1830-1840 ◽  
Author(s):  
Quan Wen ◽  
Wenya Li ◽  
Vivek Patel ◽  
Yanjun Gao ◽  
Achilles Vairis
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Welding Speed ◽  
Friction Stir ◽  
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.

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