文献类型：期刊文献

英文题名：Laser micro-welding technology for Cu-Al dissimilar metals and mechanisms of weld defect formation

作者：Shi, Wenqing[1];Huang, Jiang[1];Xie, Yuping[1];Li, Yongqiang[1];An, Fenju[2]

机构：[1]Guangdong Ocean Univ, Coll Elect & Informat Engn, Zhanjiang 524088, Guangdong, Peoples R China;[2]Guangdong Ocean Univ, Sch Mech & Power Engn, Zhanjiang 524088, Guangdong, Peoples R China

年份：2017

卷号：93

期号：9-12

起止页码：4197

外文期刊名：INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000416179700100)、、EI(收录号：20173204028116)、Scopus(收录号：2-s2.0-85026837507)、WOS

基金：Supported by the Natural Science Foundation of Guangdong Province (Grants No. 2015A030310354), the Projection of Enhancing School with Innovation of Guangdong Ocean University (Grants No. GDOU2017052504), and the Foundation of Excellent-Young-Backbone Teacher of Guangdong Ocean University (Grants No. HDYQ2017005)

语种：英文

外文关键词：Laser micro-welding; Cu-Al dissimilar metals; Microscopic mechanism

外文摘要：To study laser micro-welding technology for copper-aluminum (Cu-Al) dissimilar metals and the intrinsic mechanisms of weld defect formation, we used a 300-W energy negative-feedback Nd:YAG pulsed laser welding system for laser micro-welding of two dissimilar metals, i.e., a I broken vertical bar 0.25-mm thin Cu wire and an Al pin. The former has a high melting point and good fluidity, whereas the latter has poor fluidity, is hard to weld, is easily oxidizable, and easily forms weld defects such as blowholes. Under laser irradiation, the Cu metal was melted to coat the Al material, which then melts, followed by solution-diffusion to accomplish the welding. We selected a laser beam with a rapid ascending and slow descending waveform, a pulse width of 3.0 ms, a peak power of 0.7 kW, and a single pulse energy of 3.3 J to enable successful welding at a negative defocus of -0.5 mm. Finally, the microscopic mechanisms of weld formation during laser micro-welding of Cu-Al dissimilar metals were analyzed; the causes of the formation of hot cracks and blowholes were analyzed in detail from aspects of Cu-Al dissimilar metals such as physical properties, lattice structure, and latent heats of solidification, and accordingly, solutions are proposed to provide a reliable theoretical basis for laser welding of Cu-Al dissimilar metals.