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谷晓燕,孟政宇,刘婧,隋成龙,朱开轩,狄星.焊接能量对Mg/Ti超声波焊接接头微观组织与力学性能的影响[J].稀有金属材料与工程(英文),2020,49(6):2139~2146.[Gu Xiaoyan,Meng Zhengyu,Liu Jing,Sui Chenglong,Zhu Kaixuan and Di Xing.Effect of welding energy on microstructure and mechanical properties of the Mg/Ti joints welded by ultrasonic spot welding[J].Rare Metal Materials and Engineering,2020,49(6):2139~2146.]
Effect of welding energy on microstructure and mechanical properties of the Mg/Ti joints welded by ultrasonic spot welding
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Received:May 13, 2019  Revised:June 21, 2019
DOI:
Key words: ultrasonic welding  Mg/Ti dissimilar metals  welding energy  mechanical properties
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Gu Xiaoyan,Meng Zhengyu,Liu Jing,Sui Chenglong,Zhu Kaixuan and Di Xing  
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Abstract:
      Mg/Ti dissimilar metals were welded by ultrasonic welding. The effects of different welding energy on the interfacial peak temperature, interfacial morphology, interfacial atom diffusion degree and mechanical properties of the joint were investigated. It is shown that the overall interface of Mg/Ti is relatively straight during the welding process, the local interface has small fluctuations, no cracks, lack of fusion and other defects are found, and no obvious reaction layer is observed. The interfacial peak temperature ,the thickness of the atomic diffusion layer , the connection zone and mechanical properties of the joint increase with the increase of welding energy. When the energy reaches 2000J, the magnesium side base material shows welding cracks. The joint fracture mode is divided into interface fracture and button fracture. The fracture location occurs at the magnesium side diffusion layer area and the magnesium side non-diffusion layer area. Scanning electron microscopy and X-ray diffractometry analysis showed that there was no obvious intermetallic formation in the Mg/Ti interface region.