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http://dx.doi.org/10.3795/KSME-B.2005.29.10.1111

A Unified Analysis of Low-Power and High-Power Density Laser Welding Processes with Evolution of Free Surface  

Ha Eung-Ji (한양대학교 대학원 기계공학과)
Kim Woo-Seung (한양대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.29, no.10, 2005 , pp. 1111-1118 More about this Journal
Abstract
In this study, a unified numerical investigation has been performed on the evolution of weld pool and key-hole geometry during low-power and high-power density laser welding. Unsteady phase-change heat transfer and fluid flow with the surface tension are examined. The one-dimensional vaporization model is introduced to model the overheated surface temperature and recoil pressure during high-power density laser welding. It is shown that Marangoni convection in the weld pool is dominant at low-power density laser welding, and the keyhole with thin liquid layer and the hump are visible at high-power density laser welding. It is also shown that the transition from conduction welding to penetration welding fur iron plate exists when the laser power density is about $10^6W/Cm^2$.
Keywords
Laser Welding; Free Surface; Marangoni Convection; Keyhole; Knudsen Layer; Recoil Pressure; Recoil Pressure;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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