The theoretical study on the influence of defocusing on penetration in keyhole laser welding
- Beijing Polytechnic Univ. (China). National Center of Laser Technology
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 result in the laser welding of carbon-steel with a high power CO{sub 2} laser.
- Sponsoring Organization:
- National Natural Science Foundation of China, Beijing, BJ (China)
- OSTI ID:
- 536366
- Report Number(s):
- CONF-9611124-; ISBN 0-8194-2289-4; TRN: IM9745%%205
- Resource Relation:
- Conference: SPIE photonics China `96, Beijing (China), 3-7 Nov 1996; Other Information: PBD: 1996; Related Information: Is Part Of Laser processing of materials and industrial applications; Deng, S.S.; Wang, S.C. [eds.]; PB: 437 p.; Proceedings/SPIE, Volume 2888
- Country of Publication:
- United States
- Language:
- English
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