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俞伟元,吴炜杰,孙学敏.超声辅助电阻钎焊6063铝合金接头显微组织的演变[J].稀有金属材料与工程(英文),2019,48(12):4081.[Yu Weiyuan,Wu Weijie and Sun Xuemin.Microstructure evolution of ultrasonic-assisted electrical resistance brazing joints of 6063 aluminum alloys[J].Rare Metal Materials and Engineering,2019,48(12):4081.]
Microstructure evolution of ultrasonic-assisted electrical resistance brazing joints of 6063 aluminum alloys
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Received:October 04, 2018  Revised:November 01, 2018
Key words: 6063 aluminim alloy  ultrasonic-assisted electrical resistance brazing  ultrasonic power  current intensity
Foundation item:国家自然科学基金资助(项目号51465032)
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Yu Weiyuan,Wu Weijie and Sun Xuemin  
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      In recent years, due to the unique physical and chemical effects of ultrasonic waves, it has been widely used in the welding process. High-quality joints were obtained with the ultrasonic vibration was applied during the resistance brazing process. To date, however, little studies have been reported on the microstructure evolution mechanism of joints. In the present study, a Zn-Al alloy was used as filler metal to braze 6063 aluminum alloy using ultrasonic-assisted electrical resistance-brazing technology. The effects of ultrasonic field and electric field on the microstructure evolution of the joints were studied, and its mechanism was also analyzed. The results showed that applying ultrasonic vibration to substrate during brazing process could effectively promote the effective connection between the filler metal and base metal, reduce the defects, improved homogeneity and have obtained the joints with good metallurgical bonding. In addition, both ultrasonic power and electrical current intensity have significant effect on the dissolution during the brazing process. With the increment of ultrasonic power, the dissolution of the base metal was intensified, the Al content in the brazing seam increased, and the eutectoid α-Al phase increased. As the electrical current increases, the primary α-Al phase increases.