PRODUCTION OF METAL CHEMICAL WELDING ADDITIVE WITH NANODISPERSED PARTICLES OF TITANIUM DIOXIDE
Journal: Nanotechnologies in Construction: A Scientific Internet-Journal (Vol.5, No. 6)Publication Date: 2013-12-16
Authors : BOLDYREV Alexander Mikhaylovich; GREBENCHUK Victor Georgievich; GUSHCHIN Dmitrii Aleksandrovich; TKACHEV Alexey Grigorievich; BLINOV Sergey Valentinovich;
Page : 53-66
Keywords : metal chemical modifying agent; bridge structure welding; modifying agent-wire powder bond resistance; high-energy mechanical synthesis in planetary mill; mechanical welded connection properties;
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 (TiO?) 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 TiO? showed that when processing MCA in a planetary mill TiO? 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.
Other Latest Articles
- CONCRETE AND REINFORCED CONCRETE ? GLANCE AT FUTURE
- KINETICS OF DESTRUCTION OF NANOMODIFIED SULFIR COMPOSITES
- INTERNET-JOURNAL ?NANOTECHNOLOGIES IN CONSTRUCTION?: ACHIEVEMENTS IN 2013
- Results of research in the area of nanotechnologies and nanomaterials. Part 1
- Inventions in nanotechnological field provide increased strength and life span of the metal, composite and polymer, metallopolymer structures
Last modified: 2014-10-04 23:01:07