scholarly journals Feedback Control of Laser Welding Based on Frequency Analysis of Light Emissions and Adaptive Beam Shaping

2012 ◽  
Vol 39 ◽  
pp. 784-791 ◽  
Author(s):  
L. Mrňa ◽  
M. Šarbort ◽  
Š. Řeřucha ◽  
P. Jedlička
Keyword(s):  
Feedback Control ◽  
Laser Welding ◽  
Frequency Analysis ◽  
Beam Shaping

Modeling of Conduction Mode Laser Welding Process For Feedback Control

1999 ◽  
Vol 122 (3) ◽  
pp. 420-428 ◽  
Author(s):  
Fuu-Ren Tsai ◽  
Elijah Kannatey-Asibu,
Keyword(s):  
Feedback Control ◽  
Laser Welding ◽  
Weld Pool ◽  
Vision System ◽  
Plate Thickness ◽  
Welding Process ◽  
Laser Machine ◽  
Mode Laser ◽  
Conduction Mode ◽  
Laser Welding Process

The response of conduction mode laser weld pool dimensions, specifically weld width, to a step change in power input has been modeled using two-dimensional heat flow analysis. The goal is to develop a simplified model suitable for feedback control. The weld pool geometry was approximated by a tear-drop shape. The workpiece thermal properties were assumed to be lumped and temperature-independent. The result was a first-order weld pool thermal model. A series of experiments was performed using different welding conditions (plate thickness, step power changes, and welding speeds) to validate the model. The weld pool image was recorded using a vision system and digitized. The process time constant as calculated by the model was of the order of 10−4 seconds. The response of the laser machine, estimated by the least squares method, was found to be about 10−2 seconds, which is much slower than that of the weld pool. Thus, within the constraints of the assumptions on which the model is based, the entire laser welding process is considered to be dominated by the laser machine dynamics. [S1087-1357(00)00502-5]

FPGA implementation of time–frequency analysis algorithms for laser welding monitoring

2009 ◽  
Vol 33 (3) ◽  
pp. 179-190 ◽  
Author(s):  
A. Molino ◽  
M. Martina ◽  
F. Vacca ◽  
G. Masera ◽  
A. Terreno ◽  
...  
Keyword(s):  
Laser Welding ◽  
Frequency Analysis ◽  
Fpga Implementation ◽  
Time Frequency Analysis ◽  
Time Frequency

scholarly journals Beam shaping solutions for stable laser welding

2021 ◽  
Vol 18 (5) ◽  
pp. 38-41
Author(s):  
Joerg Volpp ◽  
Alexander Laskin
Keyword(s):  
Laser Welding ◽  
Beam Shaping ◽  
Stable Laser

scholarly journals Conduction mode laser welding with beam shaping using a deformable mirror

2022 ◽  
Vol 148 ◽  
pp. 107718
Author(s):  
Yongcui Mi ◽  
Satyapal Mahade ◽  
Fredrik Sikström ◽  
Isabelle Choquet ◽  
Shrikant Joshi ◽  
...  
Keyword(s):  
Laser Welding ◽  
Beam Shaping ◽  
Deformable Mirror ◽  
Mode Laser ◽  
Conduction Mode

scholarly journals Custom beam shaping for high-power fiber laser welding

2008 ◽  
Author(s):  
Brian Victor ◽  
Stan Ream ◽  
Craig T. Walters
Keyword(s):  
Laser Welding ◽  
Fiber Laser ◽  
High Power ◽  
Beam Shaping ◽  
Fiber Laser Welding
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