FANG Yuchao, YANG Ziyou, DING Rui, et al. Molten pool behavior of full penetration EBW on 2219 aluminum alloy[J]. 2017, 49(11): 2017-11.
DOI:
FANG Yuchao, YANG Ziyou, DING Rui, et al. Molten pool behavior of full penetration EBW on 2219 aluminum alloy[J]. 2017, 49(11): 2017-11.DOI: 10.11918/j.issn.0367-6234.201705147.
Molten pool behavior of full penetration EBW on 2219 aluminum alloy
In order to effectively control the welding seam formation during electron beam welding to meet the welding structure requirements
the physical process of molten pool during EBW was analyzed. A three-dimensional EBW model was employed to simulate the molten pool in full penetration welding based on finite volume method (FVM). The molten pool behavior and rules were discussed. The simulation results showed that when the keyhole is formed by electron beam welding
the velocity and direction of the liquid metal in the molten pool changes rapidly
and the maximum flow rate can reach 10 m/s.The molten pool was vibrated violently by recoil pressure during the welding process. The heated liquid metal away from the keyhole driven by Marangoni convection to increase the width of molten pool. The width and longitude of molten pool were stable at about 35 ms and 90 ms
respectively. After solidification
the weld reinforcement and the shrink appeared at the top surface and the reverse side. The bead shape abstracted from the simulation and experimental result showed similar evolution. Moreover
according to the analysis of fluid flow in molten pool
it can also be concluded that the driven force of recoil pressure was much greater than that of the gravity and surface tension.