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

Lee, Jae-Young; Lee, Won-Beom; Yoo, Choong-Don

Journal of KWJS 2005;23(1):48-54.
Published online April 29, 2005.

[연구논문] 레이저 키홀 용접의 열원 모델링 : Part 1-비드 용접

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

Jae-Young Lee, Won-Beom Lee, Choong-Don Yoo

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, nonnal 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.