CUED Publications database

Analysis of basic processes inside the keyhole during deep penetration ND-YAG CW laser welding

Fabbro, R and Slimani, S and Coste, F and Briand, F and Dlubak, B and Loisel, G (2006) Analysis of basic processes inside the keyhole during deep penetration ND-YAG CW laser welding. ICALEO 2006 - 25th International Congress on Applications of Laser and Electro-Optics, Congress Proceedings.

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Abstract

During laser welding, the keyhole is generated by the recoil pressure induced by the evaporation processes occurring mainly on the front keyhole wall (KW). In order to characterize the evaporation process, we have measured this recoil pressure by using a plume deflection technique, where the plume generated for static conditions (i. e. with no sample displacement) is deflected by a transverse side gas jet. From the measurement of the plume deflection angle, the recoil pressure can be determined as a function of incident intensity and sample material. From these data one can estimate the pressure generated on the front KW, during laser welding. Therefore, the corresponding dynamic pressure exerted by the vapor plume expansion on the rear KW, in contact with the melt pool, can be also estimated. These pressures appear to be in close agreement with those generated by an additional side jet that has been used in previous experiments, for stabilizing the observed melt pool oscillations or fluctuations.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:20
Last Modified: 18 Dec 2014 19:02
DOI: