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Proceedings Paper

Self-defocusing of a laser beam in the process of deep-penetration welding
Author(s): Nikolay E. Galich; Valery A. Petrushchenkov
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Paper Abstract

In this contribution, we report on the results of analytical approaches and computer simulations of laser beam self- defocusing in laser induced plasma and gas oncoming flow above a cavity in deep penetration welding at atmospheric conditions. Nonlinear lens-like processes in oncoming jet flow ensure the feedback loop between the evaporation, penetration and laser beam intensity distribution in a workpiece. The processes are self-consistent with the conditions of the stable cavity existence. It is shown that the oncoming hot air jet flow above the plume brings the main contribution in the steady state and instability of the nonlinear beam broadening, which may reach 300%.

Paper Details

Date Published: 1 February 2001
PDF: 10 pages
Proc. SPIE 4348, Fourth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, (1 February 2001); doi: 10.1117/12.417621
Show Author Affiliations
Nikolay E. Galich, St. Petersburg State Technical Univ. (Russia)
Valery A. Petrushchenkov, St. Petersburg State Technical Univ. (Russia)


Published in SPIE Proceedings Vol. 4348:
Fourth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering
Alexander I. Melker, Editor(s)

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