Nonlinear effects of laser-plasma interaction on melt-surface temperature

    Authors

    S. Sankaranarayanan;A. Kar

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    J. Phys. D-Appl. Phys.

    Keywords

    ABSORPTION; DYNAMICS; ABLATION; MODEL; Physics, Applied

    Abstract

    A plume consisting of vapour and ionized particles of the workpiece is usually formed during various types of laser materials processing. The characteristics of this plume depend on a large number of parameters such as the laser power, spot size, scanning speed, material properties and shielding gas. The height, radius, temperature and absorption coefficient of the plasma are calculated for various values of process parameters. The surface temperature of the melt pool and the vaporization rate are also calculated on the basis of the Stefan condition at the liquid-vapour interface. The absorption coefficient of the plasma given by the Kramers-Unsold relation and the ionization fraction given by the Saha-Eggert equation are used to model the laser beam propagation through the plasma. A detailed analysis of the plasma stability indicates that absorption of the laser beam by the plasma affects the melt-pool surface temperature nonlinearly.

    Journal Title

    Journal of Physics D-Applied Physics

    Volume

    32

    Issue/Number

    7

    Publication Date

    1-1-1999

    Document Type

    Article

    Language

    English

    First Page

    777

    Last Page

    784

    WOS Identifier

    WOS:000079743400005

    ISSN

    0022-3727

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