Results 91 to 100 of about 32,478 (295)

Characterization of magnetically impelled arc butt welded T11 tubes for high pressure applications

Defence Technology, 2015
Magnetically impelled arc butt (MIAB) welding is a pressure welding process used for joining of pipes and tubes with an external magnetic field affecting arc rotation along the tube circumference. In this work, MIAB welding of low alloy steel (T11) tubes
R. Sivasankari, V. Balusamy, P.R. Venkateswaran, G. Buvanashekaran, K. Ganesh Kumar   +4 more
doaj   +1 more source

A V‐Shaped In‐Pipe Robot to Travel Through Complex Winding Pathways in Three Dimensions

Journal of Field Robotics, EarlyView.
ABSTRACT This paper presents a V‐shaped gas pipeline inspection robot which achieves high roll rotation performance, out‐of‐plane double elbow travel performance, and inverted siphon adaptability at high speed without requiring complicated manual operation. The principle for traveling through the out‐of‐plane double elbow was theoretically demonstrated
Atsushi Kakogawa, Kanade Sekiya, Ryota Nakazawa, Yasuyuki Ikuno   +3 more
wiley   +1 more source

The quandle and group for higher-dimensional and virtual knots [PDF]

arXiv, 2009
Joyce has shown that the fundamental quandle of a classical knot can be derived from consideration of the fundamental group and the peripheral structure of the knot, and also that the group and much of the peripheral structure can be recovered from the quandle.
arxiv  

Disentangling Carrier‐Transport and Interfacial Carrier‐Recombination by Mitigating Na Interstitials for 11.9% Efficient Cd‐Free Cu2ZnSnS4 Solar Cells

Small, EarlyView.
A high‐efficiency Cd‐free CZTS solar cell of 11.9% efficiency is achieved by mitigating the charge‐compensation effect of Na interstitials in the CZTS absorber using device air annealing. The JSC and FF are significantly improved with enhanced electron mobility, hole density, and carrier collection efficiency in the depletion region.
Xiaojie Yuan, Jianjun Li, Lishuang Zhang, Jialiang Huang, Jialin Cong, Karen Privat, Zhou Xu, Yin Yao, Guojun He, Ao Wang, Xin Cui, Robert J. Patterson, Kaiwen Sun, Martin A. Green, Xiaojing Hao   +14 more
wiley   +1 more source

Solidification of Tungsten Inert Gas–Welded Austenitic Stainless Steel with 0.17 wt% N

steel research international, EarlyView.
The classical Scheil model with fast diffusion of nitrogen is used to describe the solidification of the weld seam from austenitic CrMnNi–N steel. The microsegregation of the elements Ni, Cr, Mn, Mo, and N is calculated and compared with experimental findings. Further, the correlation between secondary dendrite arm spacing and cooling rate is made.
Caroline Quitzke, Michael Hauser, Lutz Krüger, Olena Volkova, Marco Wendler   +4 more
wiley   +1 more source

Arc Plasma Torch Modeling [PDF]

Journal of Thermal Spray Technology, (2009), Vol. 18, No. 5/6, pp. 728-752, 2013
Arc plasma torches are the primary components of various industrial thermal plasma processes involving plasma spraying, metal cutting and welding, thermal plasma CVD, metal melting and remelting, waste treatment and gas production. They are relatively simple devices whose operation implies intricate thermal, chemical, electrical, and fluid dynamics ...
arxiv  

Thermodynamic Constraints and Prospects for Intensified Steel Deoxidation

steel research international, EarlyView.
The article provides a short survey of steel deoxidation and considers how to increase its efficacy. Bringing a specially tailored, powdered slag into the reaction site can directly bind the deoxidation product oxides, resulting in lower dissolved oxygen activity, total oxygen content, and cleaner steel.
Lauri Holappa, Sonja Nurmi
wiley   +1 more source

Multi-Skein Invariants for Welded and Extended Welded Knots and Links [PDF]

arXiv, 2018
The theory of welded and extended welded knots is a generalization of classical knot theory. Welded (resp. extended welded) knot diagrams include virtual crossings (resp. virtual crossings and wen marks) and are equivalent under an extended set of Reidemeister-type moves.
arxiv  

Phosphorus Partition in an Industrial Basic Oxygen Furnace Process in Ukraine

steel research international, EarlyView.
Phosphorus partition data from Ukrainian steel plants are analyzed, focusing on parameters like basicity, optical basicity, tapping temperature, and slag contents of FeO, MgO, and Al2O3. The analysis shows that phosphorus partition decreases with higher tapping temperatures and increases with optical basicity.
Olena Volkova, Nataliia Tinkova, Rapuruchukwu Ifeyinwa Onaa, Lukas Neubert, Kostiantyn Niziaiev, Dmytro Zotov   +5 more
wiley   +1 more source

Comparative study of electrogas and shielded metal arc welding processes on steel A537 welded joints

Materials Research Express
In this research, the electro-gas welding process was compared with a shielded metal arc welding process for welding steel A573 from a mechanical properties point of view.
Mahmoud Abbas, Essam Ahmed, Mohammad Hassan, Hamed Ahmed Abdel-Aleem   +3 more
doaj   +1 more source