High-speed simultaneous observation of plasma and keyhole behavior during high power CO2 laser welding: Effect of shielding gas on porosity formation

2000 ◽  
Vol 12 (6) ◽  
pp. 245-250 ◽  
Author(s):  
Naoki Seto ◽  
Seiji Katayama ◽  
Akira Matsunawa
Keyword(s):  
Laser Welding ◽  
Co2 Laser ◽  
High Power ◽  
High Speed ◽  
Shielding Gas ◽  
Simultaneous Observation ◽  
Porosity Formation ◽  
Keyhole Behavior

Analysis of Image Characteristics of Plume and Spatter of High Power Disk Laser Welding Based on K-L Transform

2012 ◽  
Vol 532-533 ◽  
pp. 330-334
Author(s):  
Qian Wen ◽  
Xiang Dong Gao
Keyword(s):  
Laser Welding ◽  
High Power ◽  
High Speed ◽  
Metal Vapor ◽  
Mean Value ◽  
Gray Level ◽  
Characteristic Parameters ◽  
Transform Method ◽  
Disk Laser ◽  
Vapor Plume

Metal vapor plume and spatters are the important phenomena in the process of high power disk laser welding, and there exists a close relationship with the welding stability. The images of metal vapor plume and spatters which captured by a high speed camera during high power disk laser welding were analyzed in this experiment. Image processing techniques such as median filtering, Wiener filtering, gray level threshold and lightness transform were used to process the images so that the image characteristic parameters such as the area and number of spatters in an image, the average gray, mean value, variance and entropy of a spatter gray level image and the coordinate ratio of the centriod of plume and the welding point can be extracted. To reflect the actual welding results obviously by those characteristic parameters, K-L transform method was used to get a new set of characteristic parameters. Experimental results showed that this new set of characteristic parameters could reflect the actual welding effectively.

scholarly journals Light Emission from Keyhole in High-Power CO2 Laser Welding.

2002 ◽  
Vol 30 (1) ◽  
pp. 38-43 ◽  
Author(s):  
Isamu MIYAMOTO ◽  
Takashi INOUE ◽  
Kazuhiko ONO ◽  
Kaoru ADACHI
Keyword(s):  
Laser Welding ◽  
Co2 Laser ◽  
High Power ◽  
Light Emission
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