Thermocapillary convection in a melted pool during laser surface remelting

D. Morvan; Philippe Bournot; A. Garino; Daniel Dufresne

doi:10.1117/12.144582

4 May 1993 Thermocapillary convection in a melted pool during laser surface remelting

D. Morvan, Philippe Bournot, A. Garino, Daniel Dufresne

Proceedings Volume 1810, 9th International Symposium on Gas Flow and Chemical Lasers; (1993) https://doi.org/10.1117/12.144582
Event: Ninth International Symposium on Gas Flow and Chemical Lasers, 1992, Heraklion, Greece

Abstract

The melted pools produced during some laser material processing (welding, surface treatment, etc.) are subjected to high convective motions which very significantly affect the thermal coupling between the laser beam and the working piece. This flow is produced by the surface tension gradient which results from the non-uniform temperature distribution at the free surface of the material. This physical phenomenon is known as the Marangoni or thermocapillary convection. The thermocapillary convection induces a strong mixing effect which reduces the gradients of any quantity transported in the melted material (such as temperature, composition, etc.). The shape factor of the melted pool, and therefore the free surface stability, are greatly modified by these convective motions. For some experimental conditions, distortions of the free surface could exist after resolidification, producing a rough state of the surface. We present in this paper a numerical simulation of thermocapillary convection in a melted pool produced by a stationary heat flux on a rectangular target (the resolution is limited to the 2-D problem). After a short presentation of the physical and mathematical model, the temperature fields and the streamlines obtained for various physical conditions are analyzed.

Citation Download Citation

D. Morvan, Philippe Bournot, A. Garino, and Daniel Dufresne "Thermocapillary convection in a melted pool during laser surface remelting", Proc. SPIE 1810, 9th International Symposium on Gas Flow and Chemical Lasers, (4 May 1993); https://doi.org/10.1117/12.144582

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