13 January 2005 Effect of activating flux on plasma during CO2 laser welding
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Abstract
In this paper the effect of activating flux on plasma during laser welding is studied and the Activating Flux-Laser Beam Welding (A-LBW) is proposed. The stainless steel (1Cr18Ni9Ti) is respectively welded by using activating flux and by not using activating flux. And the shape variation of plasma during laser welding is recorded directly by using three-dimension synchrony high-speed photography separately. It is found that the penetration of using activating flux is larger than the penetration not using it. When not using activating flux, there are so many negative effects such as reflection, scatter, absorption and refraction etc, which resulted in power density of acting on the work piece surface decreases and the penetration is lower. But when using activating flux, its molecules evaporated could trap electrons in the plasma to form negative corpuscles. Although the total number of the electron in the laser welding plasma aren’t decreased, but the mass of negative corpuscle is larger and then these corpuscles also became the background of the motion of electrons. Eventually the effective electron density is decreased and then the penetration is increased.
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Jinhe Liu, Licai Ma, Fusheng Zhang, Danggang Lei, "Effect of activating flux on plasma during CO2 laser welding", Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005); doi: 10.1117/12.577884; https://doi.org/10.1117/12.577884
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