波长对激光-CMT复合焊熔滴过渡行为的影响  

Effect of Wavelength on Droplet Transition Behaviors in Laser-CMT Hybrid Welding Process

作　　者：雷正龙 黎炳蔚 朱平国 陆韡 邢希学 Lei Zhenglong;Li Bingwei;Zhu Pingguo;Lu Wei;Xing Xixue(State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology Harbin, Heilongjiang 150001, China; Shanghai Space Propulsion Technology Research Institute, Shanghai 01109, China)

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001 [2]上海航天动力技术研究所,上海201109

出　　处：《中国激光》2018年第10期97-103,共7页Chinese Journal of Lasers

摘　　要：通过激光-CMT复合焊试验,研究了激光波长对熔滴过渡行为的影响。结果表明,激光通过改变熔池形态和加热焊丝影响了熔滴过渡过程,激光-CMT复合焊过程比CMT焊接过程稳定。CO_2激光对熔滴体积的影响较大,当CO_2激光功率较小时,激光可以促进熔滴过渡;当CO_2激光功率增大后激光会阻碍熔滴过渡。光纤激光对焊丝加热的作用较小,但可以增大熔滴过渡频率。CO_2激光和光纤激光等离子体温度均随激光功率的增大而升高,但CO_2激光等离子体呈团状喷发,而光纤激光等离子体几乎不喷发。The effect of laser wavelength on the droplet transition behaviors is studied in the laser-CMT hybrid welding process. The results show that, the droplet transfer process is influenced when the molten pool shape and wire-heating are changed by the laser, and the laser-CMT hybrid welding process is more stable than the CMT welding process. The CO2 laser has a relatively strong influence on the droplet volume. When the CO2 laser power is relatively low, the laser can promote the droplet transition. However, the laser prevents the droplet transition process when the laser power increases. The fiber laser has a less effect on the wire-heating, but can increase the transition frequency of droplets. The plasma temperatures from the CO2 laser and fiber laser increase with the increase of the laser power. The plasma by the CO2 laser presents a lump-like eruption but that by the fiber laser shows no eruption.

关 键 词：激光技术 熔滴过渡 高速摄像 等离子体 

分 类 号：TG456.7[金属学及工艺—焊接]