Spectroscopic characterization of laser-induced plasma created during welding with a pulsed Nd:YAG laser
作者:
D. Lacroix,
G. Jeandel,
C. Boudot,
期刊:
Journal of Applied Physics
(AIP Available online 1997)
卷期:
Volume 81,
issue 10
页码: 6599-6606
ISSN:0021-8979
年代: 1997
DOI:10.1063/1.365198
出版商: AIP
数据来源: AIP
摘要:
A spectroscopic study of a laser-induced plume created during the welding of stainless steel and other materials (iron and chromium) has been carried out. A pulsed Nd:YAG laser of 1000 W average power is used. The evolutions of the electron temperature and electron density have been studied for several welding parameters. We use working powers from 300 to 900 W and pulse durations between 1.5 and 5 ms. The influence of shielding gases like nitrogen and argon has been taken into account. Temperature and density calculations are based on the observation of the relative intensities and shapes of the emission peaks. We assume that the plasma is in local thermal equilibrium. The temperature is calculated with the Boltzmann plot method and the density with the Stark broadening of an iron line. The electron temperatures vary in the range of 4500–7100 K, electron density between 3×1022and 6.5×1022m−3.The absorption of the laser beam in the plasma is calculated using the Inverse Bremsstrahlung theory. ©1997 American Institute of Physics.
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