Study of keyhole behaviour for full penetration Nd-Yag CW laser welding

被引:88
作者
Fabbro, R
Slimani, S
Coste, F
Briand, F
机构
[1] CNRS, LALP, GIP GERAILP, F-94114 Arcueil, France
[2] AIR LIQUIDE CTAS, F-95319 St Ouen Aumone, France
关键词
D O I
10.1088/0022-3727/38/12/005
中图分类号
O59 [应用物理学];
学科分类号
摘要
The understanding of keyhole behaviour is still a topic of great importance. The keyhole dynamics can be rather easily analysed in the case of full penetration laser welding experiments. Moreover, this configuration can allow an easy access to the complete keyhole geometry, if thin metallic sheets are welded. Indeed, in this case, only one laser beam reflection occurs on the front keyhole wall (KW). We present the results of the study of these welding configurations, where a Nd: Yag laser with a top-hat intensity distribution is considered. Several diagnostics have been used. For different experimental conditions, the dynamics of the keyhole and its complete geometry (front wall inclination, top and bottom apertures) have been analysed by using on axis visualizations through the top and the bottom of the keyhole with a 4 kHz high speed video camera. The measurement of the transmitted laser power also gives access to the front KW reflectivity. These results are compared and are used to validate our dynamic keyhole modelling, where ray tracing is included. Finally, for these conditions, an analytical model can be proposed that relates the laser parameters (incident laser power, spot diameter) with the processing parameters (material, sheet thickness and welding velocity) for Nd-Yag laser welding.
引用
收藏
页码:1881 / 1887
页数:7
相关论文
共 6 条
[1]  
DAUSINGER F, 2002, P ICALEO C SCOTTSD U
[2]   Dynamical description of the keyhole in deep penetration laser welding [J].
Fabbro, R ;
Chouf, K .
JOURNAL OF LASER APPLICATIONS, 2000, 12 (04) :142-148
[3]   Metallic vapor ejection effect on melt pool dynamics in deep penetration laser welding [J].
Fabbro, R ;
Hamadou, M ;
Coste, F .
JOURNAL OF LASER APPLICATIONS, 2004, 16 (01) :16-19
[4]  
FABBRO R, 2004, P ICALEO C SAN FRANS
[5]  
Prokhorov A.M., 1990, Laser Heating of Metals
[6]   The role of recoil pressure in energy balance during laser materials processing [J].
Semak, V ;
Matsunawa, A .
JOURNAL OF PHYSICS D-APPLIED PHYSICS, 1997, 30 (18) :2541-2552