A self-consistent three dimensional laser keyhole welding model

2000 ◽  
Author(s):  
H. Ki ◽  
P. S. Mohanty ◽  
J. Mazumder
Keyword(s):  
Three Dimensional ◽  
Keyhole Welding ◽  
Self Consistent ◽  
Laser Keyhole Welding

Three-dimensional simulation transient keyhole evolution during laser keyhole welding

2009 ◽  
Author(s):  
Shengyong Pang ◽  
Liliang Chen ◽  
Yajun Yin ◽  
Tao Chen ◽  
Jianxin Zhou ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Keyhole Welding ◽  
Dimensional Simulation ◽  
Laser Keyhole Welding

scholarly journals Study of the effect of inter-pass temperature on weld overlap start-stop defects and mitigation by application of laser defocusing

2021 ◽  
Vol 114 (1-2) ◽  
pp. 117-130
Author(s):  
Wai Jun Lai ◽  
Supriyo Ganguly ◽  
Wojciech Suder
Keyword(s):  
Thermal Cycle ◽  
Laser Initiation ◽  
Thick Section ◽  
Keyhole Welding ◽  
Run Off ◽  
And Control ◽  
Laser Keyhole Welding

AbstractLaser keyhole initiation and termination-related defects, such as cracking and keyhole cavities due to keyhole collapse, are a well-known issue in laser keyhole welding of thick section steels. In longitudinal welding, run-on and run-off plates are used to avoid this problem. However, such an approach is not applicable in circumferential welding where start/stop defects remain within the workpiece. These issues can hinder industry from applying laser keyhole welding for circumferential welding applications. In this paper, the effect of inter-pass temperature on laser keyhole initiation and termination at the weld overlap start-stop region was investigated. This study has identified that defects occurring within this region were due to laser termination rather than laser initiation because of keyhole instabilities regardless of the thermal cycle. The laser termination defects were mitigated by applying a laser defocusing termination regime to reduce the keyhole depth gradually and control the closure of the keyhole.

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