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

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.

Monitoring of welding status by molten pool morphology during high-power disk laser welding

Optik ◽  
2015 ◽  
Vol 126 (19) ◽  
pp. 1797-1802 ◽  
Author(s):  
Xiangdong Gao ◽  
Yanxi Zhang
Keyword(s):  
Laser Welding ◽  
High Power ◽  
Molten Pool ◽  
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.

Numerical simulation of effect of filler wire melting and filling mode on molten pool in laser welding

2018 ◽  
Vol 47 (3) ◽  
pp. 306005
Author(s):  
彭进 Peng Jin ◽  
张文洁 Zhang Wenjie ◽  
王星星 Wang Xingxing ◽  
郭国全 Guo Guoquan ◽  
张芙蓉 Zhang Furong
Keyword(s):  
Numerical Simulation ◽  
Laser Welding ◽  
Molten Pool ◽  
Filler Wire

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

Study of Plume Behavior during High-Power Disk Laser Welding

2012 ◽  
Vol 201-202 ◽  
pp. 1076-1079
Author(s):  
De Yong You ◽  
Xiang Dong Gao
Keyword(s):  
Laser Welding ◽  
High Power ◽  
High Speed ◽  
Welding Process ◽  
Image Sequences ◽  
Process Conditions ◽  
High Speed Photography ◽  
Disk Laser ◽  
Industrial Manufacturing ◽  
Laser Welding Process

Laser welding process has been widely used in industrial manufacturing. The purpose of this paper is to explore the inter-relation between laser welding results and the laser-induced plume behavior. High-power disk laser welding of stainless steel type304 was performed at different welding speeds. Combing the high speed camera and ultraviolet sensing filter, the plume image sequences of laser welding process have been obtained. Plume features including plume volume and plume flowing direction have been extracted by using high-speed photography and image processing technology. The dynamic behavior of laser-induced plume was investigated. The results showed that the laser-induced plume feature, especially the plume volume, was closely related to laser welding process conditions.

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