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《Electric Welding Machine》 2008-09
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Laser soldering technology and its application in SMT

HAN Zong-jie1,XUE Song-bai1,WANG Jian-xin1,ZHANG Liang1,YU Sheng-lin1,2,WANG Hui1,CHEN Wen-xue1 (1.College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;2.The 14th Research Institute,China Electronics Technology Group Corporation,Nanjing 210013,China)  
The laser soldering mechanism,the kinds of laser soldering source,and the application of laser soldering in surface mount technology(SMT)were introduced in the paper.The advantages of using a laser for soldering arise from its properties of localized heating and the rapid rise and drop in temperature of the soldered joints.Localized heating makes it possible to solder heat sensitive devices and heat sink assemblies in densely populated boards, while also reducing bridging between the solder pads.A rapid rise and drop in temperature creates a fine microstructure in the solder giving improved fatigue properties.The diode laser,with characteristics of short wavelength,high electro-optical efficiency,compact structures and easy to maintain,will be found a wide application in laser soldering technology.
【Fund】: 江苏省普通高校研究生科研创新计划资助项目(CX07B_087z);; 江苏省“六大人才高峰”资助项目(06-E-020)
【CateGory Index】: TG454
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