Research of low-power pulsed laser welding of stainless steel with activating fluxes
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College of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Corresponding author:
LIU Shun-hong, liusang@mail.hust.edu.cn
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Received Date:
2010-06-17
Accepted Date:
2010-07-05
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Abstract
To improve the welding efficiency and reduce cost, the possibility of the penetration improvement on the welding joints by low-power pulsed laser with activating fluxes was studied. Based on the research of low-power pulsed laser welding of SUS304 stainless steel with five activating fluxes (TiO2, SiO2,Cr2O3, CaF2, NaF), the effect of the fluxes on the penetration of joints, as well as the mechanism of penetration improvement, was studied, and the relevant data was received. The results show that the penetration can be changed with all the activating fluxes, among which TiO2 and SiO2 can deepen the penetration by 38.290% and 17.175% respectively. Meanwhile the depth/width ratios are improved in different degrees by Cr2O3, TiO2 and SiO2, however the fluoride has little effect on this ratio. The existence of activating fluxes not only improves the absorption rate of laser power, but also changes the convection of the welding pool, which makes the microstructures within the welding vary. The result is helpful for the further application of the activating fluxes in the laser technique.
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