中国激光, 2017, 44 (6): 0602008, 网络出版: 2017-06-08   

薄板铝合金光纤激光压焊坡口内材料的熔化行为

Melting Behavior of Materials in Grooves During Fiber Laser Pressure Welding of Thin-Sheet Aluminum Alloy
作者单位
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, 北京 100124
摘要
利用光纤激光扫描焊接铝合金V型坡口, 研究了坡口角度、透镜焦距、离焦量等对坡口内材料熔化行为的影响。结果表明, V型坡口对光纤激光具有明显的汇聚作用。当焦距为300 mm、离焦量为0~10 mm、坡口角度为5°时, 坡口内可获得较好的熔化效果。进一步分析表明, 这与铝对光纤激光在布儒斯特角处的吸收率不高有关, 但由于每次反射会损失部分激光能量, 因此光纤激光在V型坡口内的反射次数不宜过多。
Abstract
The effects of groove angle, focal length of lens and defocusing amount on the melting behavior of the materials in the grooves are studied by utilizing the fiber laser to scan and weld aluminum alloy V-grooves. The results show that the V-groove can focus fiber laser apparently, and the better melting effect in grooves can be obtained when the focal length is 300 mm, the defocusing amount is 0~10 mm, and the incident angle is 5°. Further analysis demonstrates that, this is attributed to the low absorptivity of aluminum to fiber laser at the Brewster angle. In addition, because of the energy losing for each laser reflection, the overmuch number of reflection of fiber laser in V-grooves is inappropriate.

和岳, 武强, 邹江林, 哈纳, 肖荣诗. 薄板铝合金光纤激光压焊坡口内材料的熔化行为[J]. 中国激光, 2017, 44(6): 0602008. He Yue, Wu Qiang, Zou Jianglin, Ha Na, Xiao Rongshi. Melting Behavior of Materials in Grooves During Fiber Laser Pressure Welding of Thin-Sheet Aluminum Alloy[J]. Chinese Journal of Lasers, 2017, 44(6): 0602008.

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