期刊
OPTICS AND LASER TECHNOLOGY
卷 45, 期 -, 页码 551-557出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2012.05.033
关键词
Deep penetration laser welding; Plasma temperature; Optical spectroscopy
资金
- National Natural Science Foundation of China (NSFC) [51175165]
- National Science and Technology Major Project of China [2012ZX04003101]
Laser-induced plasma in deep penetration laser welding is located inside or outside the keyhole, namely, keyhole plasma or plasma plume, respectively. The emergence of laser-induced plasma in laser welding reveals important information of the welding technological process. Generally, electron temperature and electron density are two important characteristic parameters of plasma. In this paper, spectroscopic measurements of electron temperature and electron density of the keyhole plasma and plasma plume in deep penetration laser welding conditions were carried out. To receive spectra from several points separately and simultaneously, an Optical Multi-channel Analyser COMA) was developed. On the assumption that the plasma was in local thermal equilibrium, the temperature was calculated with the spectral relative intensity method. The spectra collected were processed with Abel inversion method to obtain the temperature fields of keyhole plasma and plasma plume. (c) 2012 Elsevier Ltd. All rights reserved.
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