Self-defocusing of a laser beam in the process of deep-penetration welding

Nikolay E. Galich; Valery A. Petrushchenkov

doi:10.1117/12.417621

1 February 2001 Self-defocusing of a laser beam in the process of deep-penetration welding

Nikolay E. Galich, Valery A. Petrushchenkov

Proceedings Volume 4348, Fourth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering; (2001) https://doi.org/10.1117/12.417621
Event: Fourth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, 2000, St. Petersburg, Russian Federation

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%.

Citation Download Citation

Nikolay E. Galich and Valery A. Petrushchenkov "Self-defocusing of a laser beam in the process of deep-penetration welding", Proc. SPIE 4348, Fourth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, (1 February 2001); https://doi.org/10.1117/12.417621

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available