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Proceedings Paper

Theoretical study on the influence of defocusing on penetration in keyhole laser welding
Author(s): Hanhua Mei; Rongshi Xiao; Tiechuan Zuo
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Paper Abstract

It is interesting to theoretically discuss the role of the focus position in keyhole laser welding. Based on the energy balance between the laser power, the vaporizing energy of the material, and the energy loss by heat conduction, a mathematical model of the keyhole has been set up. The model describes the relationship between the geometrical shape of the keyhole and the laser parameters, technological parameters and the specific characteristics of the metal. From this model, an analytical expression between the focus position and the weld depth is obtained, and the influence of the defocusing on the penetration in keyhole laser welding is studied. The calculation results shows that the weld penetration reaches the peak when the focus penetrates into the material by a third of the full penetration. The theoretical result has good correspondence with the experiment results in the laser welding of carbon-steel with a high power CO2 laser.

Paper Details

Date Published: 30 September 1996
PDF: 6 pages
Proc. SPIE 2888, Laser Processing of Materials and Industrial Applications, (30 September 1996); doi: 10.1117/12.253144
Show Author Affiliations
Hanhua Mei, Beijing Polytechnic Univ. (China)
Rongshi Xiao, Beijing Polytechnic Univ. (China)
Tiechuan Zuo, Beijing Polytechnic Univ. (China)

Published in SPIE Proceedings Vol. 2888:
Laser Processing of Materials and Industrial Applications
Shu-Sen Deng; S. C. Wang, Editor(s)

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