Numerical simulation of laser ablation driven melt waves

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Numerical simulations on the melt flow down the keyhole front during fibre laser welding are presented here. The calculations confirm the existence of melt waves previously observed by high speed imaging, with velocities ranging between 4 and 10 m/s. The simulations provide spatial and temporal information on the temperature and flow fields, particularly within the melt film volume, which cannot be observed by high speed imaging. The ablation pressure achieves high values around wave-peaks and at the bottom of the front, just before droplets are sheared off. The simulation results provide explanations on the main liquid transport mechanisms within the keyhole based on information on the temperature, velocity and pressure field and on the geometrical front conditions. (c) 2017 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2017-12
Language
English
Article Type
Article
Keywords

WELD POOL DYNAMICS; SPATTER FORMATION; BOILING FRONT; KEYHOLE FRONT; MOLTEN POOL; ABSORPTION; PRESSURE; MODEL; VAPORIZATION; TEMPERATURE

Citation

JOURNAL OF MANUFACTURING PROCESSES, v.30, pp.303 - 312

ISSN
1526-6125
DOI
10.1016/j.jmapro.2017.09.032
URI
http://hdl.handle.net/10203/238779
Appears in Collection
ME-Journal Papers(저널논문)
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