|
Abstract: The
iterative equation to extract the keyhole depth is founded according to
the energy balance met by evaporation of the keyhole front wall and the
extracted radial keyhole dimension in coaxial visual monitoring, and the
weld penetration is monitored in the Nd: YAG laser deep penetration
welding process based on the extracted keyhole depth. The studied
results show that the monitored weld penetration accords well with that
of experiment and the monitored error is less than 12% for partial
penetration. While for full penetration, the monitored weld penetration
is much greater than the thickness of the workpiece, which is used to
judge whether the workpiece is fully penetrated or not. The experimental
results indicate that it is effective to monitor weld penetration in
laser deep penetration welding based on the energy balance model of
keyhole front wall by using coaxial visual sensing system.
Key words: Nd: YAG
laser deep penetration welding Keyhole Energy balance Weld
penetration Coaxial visual sensing
CLC No: TG456.7
Received 20050607,received
in revised form 20060330
|