Testing and Analysis of High-Speed Camera for Droplet Transition

2011 ◽  
Vol 271-273 ◽  
pp. 79-83 ◽  
Author(s):  
Yuan Mei Wen ◽  
Shi Sheng Huang ◽  
Gui Xiong Liu
Keyword(s):  
Arc Welding ◽  
High Speed ◽  
High Speed Camera ◽  
Gravity Center ◽  
Camera System ◽  
Molten Droplet ◽  
Electrical Arc ◽  
Complicated Process ◽  
Welding Metal ◽  
Droplet Transition

The droplet transition of electrical arc welding is a complicated process that combines heat, mass and momentum transfer. A high-speed camera system with laser in the background is established to observe the fast changing process of molten droplet transition. A group of high-speed camera pictures which indicate the droplet gravity center is unstable in welding metal transfer process are taken and analyzed. The experimental results show that the electromagnetic force is the unstable root of the droplet gravity center.

Testing and Analysis of High-Speed Camera for Pulse MIG/MAG Welding Droplet Transition

2011 ◽  
Vol 103 ◽  
pp. 134-137
Author(s):  
Yuan Mei Wen ◽  
Shi Sheng Huang ◽  
Gui Xiong Liu
Keyword(s):  
Arc Welding ◽  
High Speed ◽  
Feed Speed ◽  
High Speed Camera ◽  
Welding Wire ◽  
Camera System ◽  
Electrical Arc ◽  
Size And Shape ◽  
Complicated Process ◽  
Droplet Transition

The droplet transition of electrical arc welding is a complicated process that combines heat, mass and momentum transfer. A high-speed camera system with laser in the background is established to observe the fast changing process of droplet transition. A group of high-speed camera pictures which indicate that the size and shape of droplet have strong uncertainty are taken and analyzed. The results show that the randomness of droplet size and shape are decided by its internal and external random factors, such as: the changing of the length of welding wire stretched out, the fluctuation of the feed speed of welding wire etc.

Design of high speed camera system with area-CCD KAI-0340DM

2011 ◽  
Vol 19 (11) ◽  
pp. 2791-2799 ◽  
Author(s):  
余达 YU Da ◽  
郭永飞 GUO Yong-fei ◽  
周怀得 ZHOU Huai-de ◽  
武星星 WU Xing-xing ◽  
李广泽 LI Guang-Ze ◽  
...  
Keyword(s):  
High Speed ◽  
High Speed Camera ◽  
Camera System

Analysis of Cracking Processes of Sandstone in Rockburst Test

2012 ◽  
Vol 256-259 ◽  
pp. 1052-1059
Author(s):  
De Jian Li ◽  
Fei Zhao ◽  
Run Jie Ma ◽  
Li Qiang Han ◽  
Xiao Hu Wu
Keyword(s):  
Growth Rate ◽  
Fractal Dimension ◽  
Crack Propagation ◽  
High Speed ◽  
Fractal Dimensions ◽  
Rock Surface ◽  
Horizontal Line ◽  
High Speed Camera ◽  
Camera System ◽  
Very High

High speed camera system is used to record crack propagation on rock surface during the lab rocburst experiment. This paper presents the specific analytical method of crack propagation with high speed images. Crack propagation types and directions are briefly described, and the lengths, growth rate and fractal dimension of cracks are calculated. The results show that the crack grows mainly along the horizontal line on the unloading surface, at a low speed before rockburst and reaches a very high speed abruptly near the burst point. The fractal dimensions demonstrated that the crack turns to be rough when rockburst happens. The study on the crack propagation is benefit to the understanding on the mechanism of rockburst.

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