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Proceedings Paper

Plasma characterization in laser cutting
Author(s): Hideyuki Horisawa; Hiroaki Ashizawa; Nobuo Yasunaga
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Paper Abstract

Characterization of a blue plasma was conducted using a high- speed I.I. video camera, a color CCD video camera, and a spectrum multi-channel analyzer. A blight blue plasma, which contains Fe, N2 and N2+ was observed from a cutting point in laser cutting with either through- and non- through penetration when the cutting quality was not satisfactory. From the results, a use of the blue plasma signals can be effective for the in-process monitoring of a cut surface quality in laser cutting. Also, removal processes of molten material, can be divided into two types, (1) by the dynamic pressure of a coaxial gas jet, and (2) by the recoil force with an evaporation. An explosive evaporation of molten material from a point of laser irradiation was observed almost simultaneously with the plasma formation. At the cutting front, a small crater was seen at a point of the plasma formation. It was found that N2+ and N2 spectra are not emitted directly through a direct absorption of a laser beam by a gas jet, but presumably through the secondary collisions of N2 in a gas jet with electrons and/or Fe atoms emitted and accelerated from the material surface by a strong radiant energy of the laser beam.

Paper Details

Date Published: 7 February 2000
PDF: 8 pages
Proc. SPIE 3888, High-Power Lasers in Manufacturing, (7 February 2000); doi: 10.1117/12.377049
Show Author Affiliations
Hideyuki Horisawa, Tokai Univ. (Japan)
Hiroaki Ashizawa, Tokai Univ. (Japan)
Nobuo Yasunaga, Tokai Univ. (Japan)

Published in SPIE Proceedings Vol. 3888:
High-Power Lasers in Manufacturing
Xiangli Chen; Tomoo Fujioka; Akira Matsunawa, Editor(s)

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