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Heat Source Modeling of Laser Keyhole Welding: Part 1-Bead Welding  

Lee Jae-Young (Production Engineering Research Center, LG Electronics)
Lee Won-Beom (POSCO Technical Research Lab.)
Yoo Choong-Don (Dept. of Mech. Eng., KAIST)
Publication Information
Journal of Welding and Joining / v.23, no.1, 2005 , pp. 48-54 More about this Journal
Abstract
Laser keyhole welding is investigated using a three-dimensional Gaussian heat source, and the heat source parameters such as the keyhole depth, welding efficiency and power density distribution factor are determined in a systematic way. For partial penetration, the keyhole depth is same as the penetration and is predicted using the experimental data. The welding efficiency is calculated using the ray-tracing method and the power density distribution factor is determined from the bead shape. Full penetration is classified into the transition, normal and excessive modes depending on the degree of keyhole opening. Thermal analysis of the bead-on-plate welds is conducted using the Gaussian heat source, and the calculated weld geometries show reasonably good agreements with the experimental results.
Keywords
Laser welding; Gaussian heat source; Heat source parameters; Melting mode;
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