The transient thermo-flow-electromagnetic dynamic numerical model was proposed for the simulation of deep-penetration laser beam welding of 6 mm thick 5056 aluminum alloy under an external static magnetic field. The transient temperature, velocity and electromagnetic fields were calculated and the modeling of Peclet number within the welding pool was conducted. The influence of varying magnetic flux densities on molten flow and thermal transfer behavior was analyzed. The results shown that, significant Hartmann effect could be induced in the weld pool with static magnetic field aligned, resulting in Marangoni convection compression, melt flow deceleration and intensity reduction of thermal convection. Accordingly, the weld pool length contracted along the welding direction, and the solid-liquid interface became less curved. Meanwhile, the thermal hysteresis effect occurred at weld pool surface and inside. The local molten metal was heated and the temperature gradient was increased, leading to the increase of thermal diffusion rate and local extension of weld pool dimensions. The variations of seam profile in magnetically supported laser beam welding attributed to the synthetic actions of Hartmann effect and thermal hysteresis.
CHEN Jicheng
,
CHEN Xiaomei
,
CHANG Yiting
,
LIU Xuejun
,
WEI Yanhong
. Melt flow and thermal transfer of welding pool during static magnetic field supported deep-penetration laser beam welding of 5056 aluminum alloy[J]. Transactions of The China Welding Institution, 2021
, 42(3)
: 63
-69
.
DOI: 10.12073/j.hjxb.20201217003
[1] 黄坚, 李铸国, 唐新华. 中厚板的高功率激光焊接[J]. 航空制造技术, 2010(2): 26-29
Huang Jian, Li Zhuguo, Tang Xinhua. High-power laser welding of plate[J]. Aeronautical Manufacturing Technology, 2010(2): 26-29
[2] 韩晓辉, 马寅, 马国龙, 等. 双光束激光焊匙孔动态特征分析[J]. 焊接学报, 2020, 41(2): 93-96
Han Xiaohui, Ma Yin, Ma Guolong, et al. Dynamic characteristic analysis of keyhole in double beam laser welding[J]. Transactions of the Chnia Welding Institutation, 2020, 41(2): 93-96
[3] Katayama S, Kawaguchi S, Mizutani M. Welding phenomena and in-process monitoring in high-power YAG laser welding of aluminium alloy[J]. Welding International, 2009, 23(10): 753-762.
[4] Nakamura H, Kawahito Y, Nishimoto K, et al. Elucidation of melt flows and spatter formation mechanisms during high power laser welding of pure titanium[J]. Journal of Laser Application, 2015, 27(3): 032012.
[5] Avilov V V, Gumenyuk A, Lammers M, et al. PA position full penetration high-power laser beam welding of up to 30 mm thick AlMg3 plates using an electromagnetic weld pool support[J]. Science and Technology of Welding and Joining, 2012, 17(2): 128-133.
[6] Kern M, Berger P, Hügel H. Magneto-fluid dynamic control of seam quality in CO2 laser beam welding[J]. Welding Journal, 2000, 79(3): 72-78.
[7] Bachmann M, Avilov V V, Gumenyuk A, et al. About the influence of a steady magnetic field on weld pool dynamics in partial penetration high power laser beam welding of thick aluminium parts[J]. International Journal of Heat and Mass Transfer, 2013, 60: 309-321.
[8] Rong Y M, Xu J J, Cao H Y, et al. Influence of steady magnetic field on dynamic behavior mechanism in full penetration laser beam welding[J]. Journal of Manufacturing Processing, 2017, 26: 399-406.
[9] Cao L C, Liu D H, Jiang P, et al. Multi-physics simulation of dendrite growth in magnetic field assisted solidification[J]. International Journal of Heat and Mass Transfer, 2019, 144: 11867.
[10] Gatzen M, Tang Z. CFD-based model for melt flow in laser beam welding of aluminium with coaxial magnetic field[J]. Physics Procedia, 2010, 5: 317-326.
[11] Bachmann M, Avilov V V, Gumenyuk A, et al. Numerical assessment and experimental verification of the influence of the Hartmann effect in laser beam welding processes by steady magnetic fields[J]. International Journal of Thermal Sciences, 2016, 101: 24-34.
[12] Chen J C, Wei Y H, Zhan X H, et al. Melt flow and thermal transfer during magnetically supported laser beam welding of thick aluminum alloy plates[J]. Journal of Materials Processing Technology, 2018, 254: 325-337.
[13] Chen J C, Wei Y H, Zhan X H, et al. Influence of magnetic field orientation on molten pool dynamics during magnet-assisted laser butt welding of thick aluminum alloy plates[J]. Optics and Laser Technology, 2018, 104: 148-158.
