Feasibility Investigation of Laser Welding Aluminum Alloy 7075-T6 through the use of a 300 W, Single-Mode, Ytterbium Fiber Optic Laser.

fiber optic laser;7075-T6;aluminum alloy;laser welding

Paleocrassas, Alexander Grant ; Dr. F. Wu, Committee Member,Dr. J. W. Eischen, Committee Member,Dr. J. F. Tu, Committee Chair,Paleocrassas, Alexander Grant ; Dr. F. Wu ; Committee Member ; Dr. J. W. Eischen ; Committee Member ; Dr. J. F. Tu ; Committee Chair

University:North Carolina State University

关键词: fiber optic laser;    7075-T6;    aluminum alloy;    laser welding;   

Others  :  https://repository.lib.ncsu.edu/bitstream/handle/1840.16/2443/etd.pdf?sequence=1&isAllowed=y

美国|英语

来源: null

【 摘 要 】

Aluminum alloys are important structural materials because of their high strength to weight ratio. Unfortunately, due to their high reflectivity and complexity in heat treatment, aluminum alloys are some of the hardest metals to be laser welded successfully and very high laser power is usually required. In this study, the feasibility of using a 300 W, Single-Mode, Ytterbium Fiber Optic Laser for aluminum welding is investigated. The objective is to explore an application area with low power and low welding speed. As the fiber laser offers much better beam quality (M2 less than 1.05), the results show that, with proper control of welding parameters, the success of aluminum welding can be achieved at considerably low laser power with minimal formation of typical welding defects (porosity, cracking etc.). However, the focusing becomes highly critical as exceeding a certain power density can lead to defects such as blowholes and porosity. The deepest penetration achieved was just over 1 mm at 300W and 2 mm/sec. Other welding processes achieve about three to four times as much penetration at the expense of seven times more power. Further development of this process can lead to a more efficient use of power.