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Christian Diegel, Thorsten Mattulat, Klaus Schricker, Leander Schmidt, Thomas Seefeld, Jean Pierre Bergmann and Peer Woizeschke
Background. Spatter formation at melt pool swellings at the keyhole rear wall is a major issue for laser deep penetration welding at speeds beyond 8 m/min. A gas nozzle directed towards the keyhole, that supplies shielding gas locally, is advantageous in...
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Jin Peng, Jigao Liu, Xiaohong Yang, Jianya Ge, Peng Han, Xingxing Wang, Shuai Li and Yongbiao Wang
In this paper, a heat-flow coupling model of laser welding at preheating temperature was established by the FLUENT 19.0 software. The fluctuation of the keyhole wall and melt flow behavior in the molten pool under different preheating temperatures were a...
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Chao Mi, Shifeng Huang, Yujie Zhang, Zhiwei Zhang and Octavian Postolache
In the process of automatic container terminal loading and unloading, the three-dimensional attitude of the container affects the security of loading and unloading operations, so the three-dimensional attitude positioning of the container is very importa...
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Abraham Ortínez-Álvarez,Luis Gerardo Ruiz-Suárez,Enedina Ortega,Agustín García-Reynoso,Oscar Peralta,Amparo López-Gaona,Telma Castro,Amparo Martínez-Arroyo
Pág. 143 - 156
Emissions inventories are fundamental tools in the management and research of air pollution, climate change, and other relevant areas of knowledge. This work shows how the Mexico national emissions inventory for criteria pollutants was transferred from a...
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Ronald Pordzik and Peer Woizeschke
The formation of defects such as pores during deep-penetration laser welding processes is governed by the melt pool dynamics and the stability of the vapor capillary, also referred to as the keyhole. In order to gain an insight into the dynamics of the k...
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Remy Fabbro
Scaling laws of keyhole depths are derived for different laser welding regimes. Recommended operating conditions are proposed in order to reduce the risk of weld seam defects.
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Leander Schmidt, Klaus Schricker, Jean Pierre Bergmann and Christina Junger
Spatter formation is a major issue in deep penetration welding with solid-state lasers at high welding speeds above 8 m/min. In order to limit spatter formation, the use of local gas flows represents a technically feasible solution. By using the gas flow...
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Jie Shen, Jingyi Zhou, Jiemin Zhou, Lukas Herman and Tomas Reznik
Urban flooding, as one of the most serious natural disasters, has caused considerable personal injury and property damage throughout the world. To better cope with the problem of waterlogging, the experts have developed many waterlogging models that can ...
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Amr Fenais, Samuel T. Ariaratnam, Steven K. Ayer and Nikolas Smilovsky
Underground infrastructure is a critical component of the basic utility services provided to society. The single largest threat to the safety of underground utility lines is being struck by construction earthwork projects. One of the causes of this probl...
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Jipeng Shi, Yanbin Zhou and Liming Liu
Laser-TIG (tungsten inert gas) hybrid welding process is applied to produce stable back beads in the first layer during one-side multilayer welding. To explain why stable back beads can be formed, a comparison is conducted between single TIG and laser-TI...
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