scholarly journals The Dilution Effect in High-Power Disk Laser Welding the Steel Plate Using a Nickel-Based Filler Wire

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 874
Author(s):  
Ming-Feng Chiang ◽  
Tzu-Yuan Lo ◽  
Ping-Hui Chien ◽  
Chih-Hsien Chi ◽  
Kai-Chun Chang ◽  
...  
Keyword(s):  
Laser Welding ◽  
Weld Pool ◽  
High Power ◽  
Feeding Rate ◽  
Steel Plate ◽  
Lower Amount ◽  
Filler Wire ◽  
Disk Laser ◽  
Bcc Structure ◽  
Wire Feeding

High-power disk laser welding a steel plate using the Inconel 82 (IN82) filler wire with a 1.2 and 3.0 m/min feeding rate has been investigated in the experiment. The rapid thermal cycle combined with convection induced by the keyhole mechanism in laser welding results in the rapid solidification of the fusion zone (FZ). However, the microstructure of the FZ is not homogeneous at the macroscopic scale. The dilution of the FZ is important in determining the final microstructure of the weldment. For the specimen with a 1.2 m/min wire feeding rate, a lower amount of Ni-based IN82 filler is introduced into the weld pool, and the dilution of the FZ is between 65% and 100%. The BCC structure with high density boundaries dominates the entire FZ. For the specimen with a 3.0 m/min wire feeding rate, part of the filler melt is trapped on the top of the weld pool, and solidified into austenite alloyed with a Ni concentration above 15 at%. The range of dilution in the FZ with a 3.0 m/min wire feeding rate is decreased to 50–90%. There are hot cracks initiated/propagated along interdendritic austenite and in the austenite free of boundaries. Boundaries, especially for high-angle ones, in the BCC structure retard hot crack propagation in the FZ. The application of quantitative chemical analyses of Fe or Ni concentrations in the weldment provides a good approximation in evaluating the dilution of the FZ in laser welding. The methodology proposed in this study shows potential to obtain the dilution of any specific location in the FZ for industrial application in the future.

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.

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.

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

Full penetration welding of thick high tensile strength steel plate with high-power disk laser in low vacuum

2018 ◽  
Vol 32 (5) ◽  
pp. 289-302
Author(s):  
Seiji Katayama ◽  
Ryouji Ido ◽  
Koji Nishimoto ◽  
Masami Mizutani ◽  
Yousuke Mizutani
Keyword(s):  
Tensile Strength ◽  
High Power ◽  
Steel Plate ◽  
High Tensile Strength ◽  
Disk Laser ◽  
Full Penetration

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.

scholarly journals A Low-Cost Welding Status Monitoring Framework for High-Power Disk Laser Welding (December 2018)

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 17365-17376 ◽  
Author(s):  
Yanxi Zhang ◽  
Xiangdong Gao ◽  
Deyong You ◽  
Wenjun Ge
Keyword(s):  
Laser Welding ◽  
High Power ◽  
Low Cost ◽  
Disk Laser ◽  
Status Monitoring ◽  
Monitoring Framework
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