TPWJ, 2015, #12, 14-18 pages
Improving the efficiency of hybrid welding of aluminum alloys
Journal The Paton Welding Journal
Publisher International Association «Welding»
ISSN 0957-798X (print)
Issue № 12, 2015 (December)
V.Yu. Khaskin2, V.N. Korzhik2, V.N. Sydorets2, A.I. Bushma2, Wu Boyi1 And Luo Ziyi1
Chinese-Ukrainian E.O. Paton Welding Institute (Guangdong General Research Institute of Industrial Technology) (Guangzhou Research Institute of Non-Ferrous Metals). 363 Changxing Road, Tianhe, 510650, Guangzhou, China. E-mail: firstname.lastname@example.org
E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: email@example.com
Development of new laser-arc heat sources is one of the urgent directions of modern science and engineering in the field of fusion welding of metals. Allowing for their physical features can promote increase of laser-arc welding productivity due to improvement of effective efficiency, i.e. increase of the ratio of power of the heat source applied to the metal in welding to the total power of the electric arc and laser radiation. One of the ways to improve the effective efficiency of welding is reduction of laser energy losses associated with radiation reflection from the surface being welded. The work is a study of the influence of concurrent heating, provided by the electric arc, on the change of the conditions of laser radiation absorption by aluminum alloys in their laser-arc welding. The problem of determination of temperature dependence of the coefficient of laser radiation absorption by aluminum was defined and solved within the model of almost free electrons on the base of studying vapour-gas channel behavior in hybrid welding. Comparison of obtained calculation dependencies of absorption capacity with the available experimental data showed satisfactory agreement. The respective heat conductivity equation was solved, in order to determine such parameters of laser-arc welding mode as arc component power and distance between the arc impact zone and laser beam axis. Experimental verification of the proposed approach to increase of effective efficiency of laser welding, performed on samples of aluminum alloy AMg6, confirmed the validity of the predicted results. 12 Ref., 7 Figures.
laser-arc welding, aluminum alloys, CO2-laser radiation, absorption coefficient, welding current, welding speed
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