AISI304不锈钢箔振镜扫描激光微焊接工艺  

Galvanometer Scanning Laser-Micro-Welding of AISI304 Stainless-Steel Foil

作　　者：杜伟哲 黄婷[1] 曹政 栾琳 张庆伟 肖荣诗[1] Du Weizhe;Huang Ting;Cao Zheng;Luan Lin;Zhang Qingwei;Xiao Rongshi(High-Power and Ultrafast Laser Manufacturing L aboratory,Institute of Laser Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学激光工程研究院高功率及超快激光先进制造实验室

出　　处：《中国激光》2019年第11期123-129,共7页Chinese Journal of Lasers

基　　金：国家重点研发计划(2017YFB1104803)

摘　　要：振镜扫描激光微焊接是激光微焊接的发展方向。采用基模光纤激光器及振镜系统对厚度为100μm的AISI304不锈钢箔进行平板扫描焊接,对比研究了氩气保护与无气体保护时的激光微焊接工艺,建立了两种条件下激光微焊接的工艺窗口。结果表明:无气体保护时,激光微焊接会产生不稳定过渡区,其产生机理不是热导焊接模式和深熔焊接模式的交替出现,而是氧化导致的深熔焊接过程不稳定;气体保护可以避免不稳定过渡区的产生,并扩大焊接工艺窗口。Laser-micro-welding based on galvanometer scanning has attracted great interest. Herein, bead-on-plate scanning micro-welding of 100-μm-thick AISI304 stainless steel foil is conducted by using a single-mode fiber laser equipped with a galvanometer scanning system. A comparative study is conducted on the laser-micro-welding processes with/without Ar-gas protection, and process windows of laser-micro-welding for the both conditions are established. Results show that an unstable transition zone exists during laser-micro-welding without gas shielding. The unstable transition zone is generated during the deep penetration welding mode alone, rather than during the alternation of thermal conductivity welding mode and deep penetration welding mode, as reported previously. The oxidation during laser-micro-welding results in an unstable deep penetration welding mode, during which a transition zone is formed. Furthermore, by applying gas shielding, we find that the unstable transition zone is eliminated, and the welding-process window is expanded.

关 键 词：激光技术 不锈钢箔 光纤激光微焊接 气体保护 过渡区 工艺窗口 

分 类 号：TG456.7[金属学及工艺—焊接]