In this paper, the results of experiment that using YAG laser and CO2 laser to weld 6009 Aluminum alloys are investigated. The experimental results show that the weld depth and area using CO2 laser are both larger than using YAG laser under the condition of the same power and the same welding speed. The reasons are analyzed through the aspects of absorption, beam quality, focal depth and plasma. The absorption of materials to YAG laser is higher than that of CO2 laser, but the CO2 laser has high beam quality and focal depth. On the other hand, laser induced plasma strengthen the absorption of materials, so using CO2 laser can get good weld quality. These two kinds of laser processing system are compared at last in this paper.
In this paper, a new method to measure the aberration of focal mirror under high-power CO2 laser beam irradiation by phase shift is proposed. The aberration caused by distortion of focal mirror changes the phase shift of laser beam. Therefore, the transverse intensity distribution (TID) on focus of the focal mirror under the high-power CO2 laser beam irradiation is different from the ideal distribution. Furthermore, the changes of phase shift can be solved by comparing this difference. As well as the aberration can be obtained.
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