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《Journal of Nanjing University of Aeronautics & Astronautics》 2018-03
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Wear Monitoring of Friction Stir Welding Tools Based on Acoustic Emission Technology

YE Zhaowei;ZHU Yongcheng;ZUO Dunwen;ZUO Lisheng;College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics& Astronautics;  
In order to monitor the wear states of the tool during friction stir welding process online,we designed a set of acoustic emission online monitoring system based on the virtual instrument technology.The system,which combined with acoustic emission sensors,data acquisition card and signal conditioner,can collect acoustic emission signal during the friction stir welding process.In the experiment,7075 aluminum alloy was welded by the needle stirring tool with screw thread,and the acoustic emission signal during welding was collected by the self-developed online monitoring system.Then the collected acoustic emission signals were processed by wavelet packet decomposition,the percentage of each frequency band after decomposition was calculated,and the energy distribution rule was extracted as the signal feature.The result shows that friction stir welding tools have different acoustic emission signal characteristics under different wear conditions.And the wavelet packet decomposition shows that when the wear of the mixing head is slight,the proportion of energy in the low frequency band is high;on the contrary,the energy of the low frequency band accounts for a relatively low proportion when the wear of the mixing head is serious.
【Fund】: 国家自然科学基金(51675270)资助项目;; 南京航空航天大学研究生创新基地(实验室)开放基金(kfjj20170502)资助项目
【CateGory Index】: TG453.9
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