Pages: 53 – 66
PRODUCTION OF METAL CHEMICAL WELDING ADDITIVE WITH NANODISPERSED PARTICLES OF TITANIUM DIOXIDE
Authors: BOLDYREV Alexander Mikhaylovich, Doctor of Science in Engineering, Corresponding Member of Russia Academy of Architecture and Science, Professor of Department of Metal Structures and Weld in Building Construction; Russia, 394006, Voronezh, str. 20-letiya October, 84, boldyreff@inbox.ru;
GREBENCHUK Victor Georgievich, PhD in Engineering, Dep. Chief of Department of Public Company TSNIIS NITS MOSTY Scientific and Research Institute of Transport Construction (Public Company TSNIITS); Russia, 394028, Voronezh, Volgogradskaya str., 39b;
GUSHCHIN Dmitrii Aleksandrovich, PhD Student of Voronezh State University of Architecture and Civil Engineering; Russia, 394006, Voronezh, str. 20-letiya October, 84; Engineer of Department of Public Company TSNIIS NITS MOSTY Scientific and Research Institute of Transport Construction (Public Company TSNIITS); Russia, 394028, Voronezh, Volgogradskaya str., 39b, dag55@mail.ru;
TKACHEV Alexey Grigorievich, Second PhD, Professor, Head of Department «Equipment and production technologies of nanoproducts», Tambov State Technical University (TSTU); Russia, 392000, Tambov, Leningradskaya str., 1, room 146, рostmaster@kma.tstu.ru;
BLINOV Sergey Valentinovich, PhD, Associate Professor of the Department «Equipment and Production Technologies of Nanoproducts», Tambov State Technical University (TSTU), Russia, 392000, Tambov, Leningradskaya str., 1, room 146, seega@list.ru
Extended Abstract: When welding bridge structures automatic welding under a gumboil layer with metal chemical additive (MCA) is widely applied in the modern bridge building. MCA consists of a chopped welding wire (granulated material), which is powdered by modifying chemical additive of titanium dioxide (TiO₂) in the cylindrical mixer «drunk cask». Chemical composition of all welding materials including welding wire, gumboil, electrodes, are strictly normalized and controlled. However, the existing technology of producing MCA doesn’t allow precise controlling of its structure under working conditions and that causes an impact on the stability of welded connections properties. Therefore the aim of this work is to develop a technology to produce stable MCA structure. The paper compares the existing and proposed manufacturing techniques of the metal chemical additive (MCA) which is applied in automatic welding of butt connections for bridge structures. It is shown that production of MCA in a high-energy planetary mill provides more stable structure of the additive introduced into a welded joint. The granulometric analysis of the powder TiO₂ showed that when processing MCA in a planetary mill TiO₂ particles are crashed to nanodimensional order. This process is accompanied by crushing of granulated material too. The proposed method for production of MCA in a planetary mill provides stronger cohesion of dioxide with the granulate surface and, as a consequence, more stable MCA chemical structure. Application of MCA which has been mechanical intensified in a planetary mill, increases stability of mechanical properties, if compare with applied technology, in single-order by breaking point and almost twice by impact viscosity.
Key words:metal chemical modifying agent, bridge structure welding, modifying agent-wire powder bond resistance, high-energy mechanical synthesis in planetary mill, mechanical welded connection properties.
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