Theoretical study on the influence of defocusing on penetration in keyhole laser welding

Hanhua Mei; Rongshi Xiao; Tiechuan Zuo

doi:10.1117/12.253144

30 September 1996 Theoretical study on the influence of defocusing on penetration in keyhole laser welding

Hanhua Mei, Rongshi Xiao, Tiechuan Zuo

Proceedings Volume 2888, Laser Processing of Materials and Industrial Applications; (1996) https://doi.org/10.1117/12.253144
Event: Photonics China '96, 1996, Beijing, China

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.

Citation Download Citation

Hanhua Mei, Rongshi Xiao, and Tiechuan Zuo "Theoretical study on the influence of defocusing on penetration in keyhole laser welding", Proc. SPIE 2888, Laser Processing of Materials and Industrial Applications, (30 September 1996); https://doi.org/10.1117/12.253144

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