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程东海,黄继华,杨 静,赵兴科,郭和平.TC4钛合金激光叠焊成形及显微组织[J].稀有金属材料与工程(英文),2009,38(2):255~258.[Cheng Donghai,Huang Jihua,Yang Jing,Zhao Xingke,Guo Heping.Research on Microstructure and Formation Characteristic of Laser Welded Lap Joints of TC4 Titanium Alloy[J].Rare Metal Materials and Engineering,2009,38(2):255~258.]
Research on Microstructure and Formation Characteristic of Laser Welded Lap Joints of TC4 Titanium Alloy
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Received:January 25, 2008  
DOI:
Key words: laser lap welding  Ti-6Al-4V alloy  join rate
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Author NameAffiliation
Cheng Donghai University of Science and Technology Beijing, Beijing 100083, China 
Huang Jihua University of Science and Technology Beijing, Beijing 100084, China 
Yang Jing University of Science and Technology Beijing, Beijing 100085, China 
Zhao Xingke University of Science and Technology Beijing, Beijing 100086, China 
Guo Heping Institute of Aerial Manufacting Engineering Beijing, Bejing 100024, China 
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Abstract:
      Microstructure and formation characteristic of laser welded lap joints of TC4 alloy were investigated, and a parameter named join rate ψ was introduced to evaluate the welding effect of lap welding. The results indicated: the width of weld bead increases with increasing laser power or decreasing welding velocity, the top width of weld bead is larger than the bottom width and the minimum is the middle layer. And the join rate decreases as plates space or energy input increases. Microstructure of weld bead consisted of α′ martensite, and the martensite in the top portion is more concentrate than that in the bottom portion. There ate a small amount of martensite in HAZ, and distributed in gradient. For the strengthen effect of martensite, the microhardness reduces from the center of joints to base metal in cross direction, and the microhardness is higher in top weld bead