Product Code: ICAL05_503

Feasibility Investigation of Laser Welding Aluminum Alloy 7075-T6 through the use of a 300 W, Single-Mode, Ytterbium Fiber Optic Laser
Authors:
Jay Tu, North Carolina State Univ.; Raleigh NC USA
Alex Paleocrassas, North Carolina State University; Raleigh NC USA
Presented at ICALEO 2005

Aluminum alloys are very popular in the industrial world as structural materials, mainly due to their high strength to weight ratio. Unfortunately, due to their material properties, aluminum alloys are some of the hardest metals to be laser welded successfully and very high laser power is usually required. In this study, we explore the capability of using a 300 W fiber laser for high speed aluminum welding. As the fiber laser offers much better beam quality (M2 less 1.05), it is expected that, with proper control of welding parameters, such a procedure will greatly enhance the success of aluminum welding by avoiding the formation of typical welding defects (porosity, cracking etc.). Current results show that defect-free welds can be achieved at relatively high speeds. However, the focusing becomes critical as exceeding a certain power density can lead to defects such as blowholes and porosity.

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