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WANG Hongyu, DING Rui, HUANG Aiguo, KAN Peng. Analysis on keyhole phase change and flow field of back reflection induced synergistic laser weld[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(5): 125-128. DOI: 10.12073/j.hjxb.2018390137
Citation: WANG Hongyu, DING Rui, HUANG Aiguo, KAN Peng. Analysis on keyhole phase change and flow field of back reflection induced synergistic laser weld[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2018, 39(5): 125-128. DOI: 10.12073/j.hjxb.2018390137
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Analysis on keyhole phase change and flow field of back reflection induced synergistic laser weld

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  • Received Date: November 12, 2016
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  • An unified model of gas phase area, liquid phase area and solid phase area during the molten pool flow process of back reflection induced synergistic laser welding was established. Plasma & vapor cloud and keyhole absorption were considered and effects of surface tension, thermal buoyancy and gravity were taken into account in the model. The three-phase keyhole phase change and flow field of molten pool were obtained by numerical calculation, surface tension effect on flow and heat transfer of molten pool was mainly discussed. Moreover, a validation experiment of back reflection induced synergistic laser welding was carried out by taking titanium alloy sheet as an example. Results show that the coupling effect of plasma & vapor cloud caused by keyhole and back plume induced by back sub-plate is the main reason for the formation of X-type weld, and surface tension is the main driving force of the “oval reflux ring” formation in the back reflection synergistic laser welding molten pool.
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