Spectroscopic characterization of laser-induced plasma created during welding with a pulsed Nd:YAG laser

Journal Article · Thu May 01 04:00:00 EDT 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.365198· OSTI ID:496374

Lacroix, D; Jeandel, G ^[1]; Boudot, C ^[2]

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1. L.E.M.T.A. Faculte des Sciences, Universite Henri Poincare-B.P. 239, 54506 Vandoeuvre-les-Nancy cedex (France)
2. FRAMATOME, Centre technique, Z.I.P. Sud, B.P. 13, 71380 St. Marcel (France)

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{endash}7100 K, electron density between 3{times}10{sup 22} and 6.5{times}10{sup 22} m{sup {minus}3}. The absorption of the laser beam in the plasma is calculated using the Inverse Bremsstrahlung theory. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496374
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 10 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABSORPTION SPECTRA
BREMSSTRAHLUNG
CHROMIUM
ELECTRON DENSITY
ELECTRON TEMPERATURE
IRON
LASER WELDING
PLASMA DENSITY
PLASMA DIAGNOSTICS
STAINLESS STEELS
STARK EFFECT