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Laser welding-brazing characteristics of dissimilar metals Mg/Ti with…

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Laser welding-brazing of dissimilar metals AZ31B magnesium (Mg) and Ti-6Al-4V titanium (Ti) with Cu coating using AZ92 Mg based filler was performed. Influence of laser power and coating thickness on microstructure evolution and mechanical properties of 

 

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Laser welding-brazing characteristics of dissimilar metals Mg/Ti with Cu pre-coated layer

Caiwang Tan 1, 2, Zequn Zhang 1, 2, Hongyun Zhao 2, Bo Chen 2,
Xiaoguo Song 1, 2, Jicai Feng 1

1. State Key Laboratory of Advanced Welding and Joining, Harbin
Institute of Technology, Harbin 150001, China; 2. Shandong Provincial
Key Laboratory of Special Welding Technology, Harbin Institute of
Technology at Weihai, Weihai 264209, China

 

   Abstract / 摘 要    

Laser welding-brazing of dissimilar metals AZ31B magnesium (Mg) and Ti-6Al-4V titanium (Ti) with Cu coating using AZ92 Mg based filler was performed. Influence of laser power and coating thickness on microstructure evolution and mechanical properties of Mg/Cu-coated Ti joints was investigated. The results suggested that adding Cu interlayer was a feasible method for achieving metallurgical bonding of immiscible system Mg/Ti. Visually sound welds were produced in a relatively wide processing window. Ti3Al phase formed at the direct irradiation zone and Al-Cu-Ti ternary phase was observed at the intermediate zone, which indicated metallurgical bonding was achieved. The thickness of reaction layers grew slowly as the laser power increased from 1100 W to 1700 W. The increase of Cu coating thickness contributed to the increase of reaction layers. The maximum value of joint strength reached 2314N with the laser power of 1300W and Cu coating of 10.6 μm, representing 85.7% joint efficiency relative to Mg base metal. Only interfacial failure was found from all joints during the tensile-shear test. Fracture surface presented overall smooth characteristic when laser power was relative low. Obvious tear ridge was observed as the laser power increased. Meanwhile, Ti3Al particles on the fracture surface produced with thicker Cu coating exhibited bigger size and denser distribution when compared with that made with the same lower power.

   Key words / 关键词    

magnesium alloy; titanium alloy; laser welding-brazing; dissimilar joining; microstructure

   About the author / 作者简介    

\

He is currently working in the Harbin Institute of Technology at Weihai as an assistant professor. He was born in August, 1986. He got his Ph D degree from Harbin Institute of Technology in 2014 and worked as a visiting scholar in University of Waterloo in Canada from 2012.9 to 2013. 9. His research field mainly focuses on dissimilar metal joining by laser welding-brazing process, such as Al/steel, Mg/ steel, Mg/Ti, as well as laser-arc hybrid welding of thick plates. More than 30 research papers have been published till now.

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