Modelling of gas jet effect on the melt pool movements during deep penetration laser welding
Modelling of gas jet effect on the melt pool movements during deep penetration laser welding
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DOI：
10.1088/0022-3727/41/5/055503
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发表时间：
2008-03
期刊：
影响因子：
--
通讯作者：
E. Amara;R. Fabbro
中科院分区：
文献类型：
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作者：
E. Amara;R. Fabbro
为了研究惰性气体喷射对金属液态流动的影响，建立了连续Nd-YAG激光束在铁深熔焊接过程中诱导熔池运动的模型。计算了锁孔形状作为工作参数的函数，并利用导出的锁孔壁边界条件，应用凝固模型计算了假定的固定熔池边界。将钥匙孔内产生的蒸汽流动、表面张力和反冲压力作为产生熔池运动的机制，采用多相体积流体法模拟了钥匙孔、熔池和周围空气界面的演化过程。根据实验观察，我们证明了熔池内部产生了重要的搅拌效应，并且通过将模型扩展到研究45°惰性气体在100 m s - 1下投射对金属液池的影响，表明获得了更均匀的流动。
A modelling of the induced melt pool movements during iron deep penetration welding by CW Nd–YAG laser beam is developed, with the aim of studying the effect of inert gas jet on the liquid metal flow. The keyhole shape is calculated as a function of the operating parameters and the derived boundary conditions on the keyhole walls are used, by applying a solidification model, to calculate the frontiers of the assumed stationary molten pool. The vapour flow generated inside the keyhole, the surface tension and the recoil pressure are considered as the mechanisms producing the melt pool movements, and the evolution of the interfaces between the keyhole, the molten pool and the surrounding air is simulated by the multiphase volume of fluid method. We demonstrate, in accordance with the experimental observations, that an important stirring effect is generated inside the melt pool, and moreover by extending the modelling to the study of the effect of 45° inert gas projection at 100 m s−1 on the metallic liquid pool, it is shown that a more uniform flow is obtained.