High-brightness disk laser welding of magnesium alloys

2010 ◽  
Author(s):  
Mohamed Wahba ◽  
Masami Mizutani ◽  
Yousuke Kawahito ◽  
Seiji Katayama
Keyword(s):  
Laser Welding ◽  
Magnesium Alloys ◽  
High Brightness ◽  
Disk Laser

Multiple-optics sensing of high-brightness disk laser welding process

2013 ◽  
Vol 60 ◽  
pp. 32-39 ◽  
Author(s):  
Deyong You ◽  
Xiangdong Gao ◽  
Seiji Katayama
Keyword(s):  
Laser Welding ◽  
Welding Process ◽  
High Brightness ◽  
Disk Laser ◽  
Laser Welding Process

Segmentation of Molten Pool Infrared Images Using Morphology during High Power Disk Laser Welding

2012 ◽  
Vol 201-202 ◽  
pp. 91-94
Author(s):  
Yan Xi Zhang ◽  
Xiang Dong Gao
Keyword(s):  
Laser Welding ◽  
High Power ◽  
Molten Pool ◽  
Welding Process ◽  
Histogram Equalization ◽  
Welding Quality ◽  
Infrared Images ◽  
Traditional Methods ◽  
Disk Laser ◽  
Laser Welding Process

Configuration of a molten pool is related to the laser welding quality. Analyzing the configuration of a molten pool is important to monitor the laser welding process. This paper proposes a method of segmentation of a molten pool and its shadow during high power disk laser welding, consequently provides the groundwork for reconstruction of the molten pool and analysis of welding quality. Subsection linear stretching histogram equalization was applied to enhance the contrast of the original images firstly, and then edge detection was used to highlight the edges. After that we used the morphology filtering method to produce the segmentation mask, and then combined the mask with the original images to get the final segmentation results. Also, the proposed method was compared with other traditional methods. The experimental results showed that our method not only could give better segmentation results and process large quantities images automatically, but also overcame the less-segmentation problems of traditional methods.

scholarly journals Real-time Monitoring for Disk Laser Welding Based on Feature Selection and SVM

2017 ◽  
Vol 7 (9) ◽  
pp. 884 ◽  
Author(s):  
Teng Wang ◽  
Juequan Chen ◽  
Xiangdong Gao ◽  
Yuxin Qin
Keyword(s):  
Feature Selection ◽  
Laser Welding ◽  
Real Time ◽  
Real Time Monitoring ◽  
Disk Laser

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 Phenomena Elucidation of High Brightness Fiber Laser Welding of Stainless Steel

2009 ◽  
Vol 35 (4) ◽  
pp. 189-198
Author(s):  
Yousuke KAWAHITO ◽  
Masami MIZUTANI ◽  
Seiji KATAYAMA
Keyword(s):  
Stainless Steel ◽  
Laser Welding ◽  
Fiber Laser ◽  
Fiber Laser Welding ◽  
High Brightness

Weld width prediction of weldment bottom surface in high-power disk laser welding

2017 ◽  
Vol 25 (9) ◽  
pp. 2524-2531
Author(s):  
陈子琴 CHEN Zi-qin ◽  
高向东 GAO Xiang-dong ◽  
王 琳 WANG Lin
Keyword(s):  
Laser Welding ◽  
High Power ◽  
Bottom Surface ◽  
Disk Laser ◽  
Weld Width

Numerical simulation of molten pool dynamics in high power disk laser welding

2012 ◽  
Vol 212 (1) ◽  
pp. 262-275 ◽  
Author(s):  
Won-Ik Cho ◽  
Suck-Joo Na ◽  
Claus Thomy ◽  
Frank Vollertsen
Keyword(s):  
Numerical Simulation ◽  
Laser Welding ◽  
High Power ◽  
Molten Pool ◽  
Disk Laser
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