The effects of turbulence on molten pool transport during melting and solidification processes in continuous conduction mode laser welding of copper–nickel dissimilar couple

2009 ◽  
Vol 29 (17-18) ◽  
pp. 3618-3631 ◽  
Author(s):  
Nilanjan Chakraborty
Keyword(s):  
Laser Welding ◽  
Molten Pool ◽  
Mode Laser ◽  
Copper Nickel ◽  
Solidification Processes ◽  
Conduction Mode ◽  
Melting And Solidification ◽  
Continuous Conduction Mode

Porosity Formation after the Irradiation Termination of Laser

2013 ◽  
Vol 800 ◽  
pp. 201-204
Author(s):  
Wang Hong ◽  
Ling Yun Wang ◽  
Ri Sheng Li
Keyword(s):  
Surface Tension ◽  
Laser Welding ◽  
Continuous Wave ◽  
Laser Beams ◽  
Formation Mechanisms ◽  
Volume Of Fluid Method ◽  
Porosity Formation ◽  
Mode Laser ◽  
Melt Pool ◽  
Solidification Processes

Porosity is formed because of the keyhole collapse. The porosity formation is associated with the melt pool dynamics, the keyhole collapse and solidification processes. The objective of the paper is t to investigate porosity formation mechanisms and fluid flow in the melt pool using the volume of fluid method. The results indicate that the formation of porosity in continuous wave keyhole mode laser welding is associated to keyhole collapse, backfilling of liquid metal close the gas exit of the laser welding keyhole, surface tension of the gas/liquid interface play an important role in the backfilling downward to the keyhole right after laser beams left.Keywords: porosity; keyhole; collapse; welding; model

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]

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

Monitoring of keyhole entrance and molten pool with quality analysis during adjustable ring mode laser welding

2020 ◽  
Vol 59 (6) ◽  
pp. 1576 ◽  
Author(s):  
Lin Wang ◽  
Masoud Mohammadpour ◽  
Baixuan Yang ◽  
Xiangdong Gao ◽  
Jean-Philippe Lavoie ◽  
...  
Keyword(s):  
Laser Welding ◽  
Molten Pool ◽  
Quality Analysis ◽  
Mode Laser ◽  
Ring Mode
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