Effect of welding methods on the structure and mechanical properties of welded joints in creep-resisting titanium alloys with different initial structural conditions

Problems of welding rotor components made of creep-resisting titanium alloys are investigated. Comparative tests of the effects of fusion welding and rotational friction welding (FW) on the structure and properties of welded joints in titanium alloys are carried out. The experimental results show that welded joints produced by rotational FW have a structure identical to the structure of the parent metal, and the heat-affected zone does not form at all. The optimum conditions of FW of creep-resisting titanium alloys are determined. Irrespective of the initial type of structure, these conditions result in the mechanical properties of the welded joint at a level of 0.9 of the properties of the parent metal.     

Gas-Phase Treatment of Dump Tailings from Metallurgical Plants in Nitrating Media to Enhance Nickel Extraction

Theoretical Foundations of Chemical Engineering - A new approach to the processing of the dump waste product stored in the tailings dumps of the nickel production enterprise Punda Gourda (Cuba) has...     

Study of the dynamic characteristics of the first unit of the I. V. Kurchatov Beloyarsk Atomic-Power Station

Results of a study of nonstationary processes in the I. V. Kurchatov Beloyarsk Atomic-Power Station, using an electrical analog machine together with the actually-operating control apparatus, are presented. This enabled the dynamic characteristics of the power unit to be obtained and the optimum parameters for setting the main controls of the station to be selected.The theoretical characteristics of the reactor were also compared with experimental results measured directly.Translated from Atomnaya Énergiya, Vol. 19, No. 2, pp. 131–137, August, 1965     

Diffusion form of the transport equation and the method of kinetic diffusion (application to one-dimensional planar geometry)

A form of the transport equation with the same structure as the elementary diffusion equation is proposed. It is distinguished by the fact that the diffusion coefficient depends not only on the properties of the medium but also on certain angular moments of the differential flux. The existence of a reciprocal relation between the angular moments and the spatial distribution of the scalar flux makes it possible to obtain an exact numerical solution of the transport equation, expressed in diffusion form, by means of a simple iteration pocedure (the method of kinetic diffusion). The relation between the transport equation in the diffusion form and the elementary theory of diffusion is examined, the results of calculations of certain variants of the the Milne problem are presented, and the inherent properties of the method, which make it effective in many practical applications, are noted. 3 Tables, 5 references. Federal Science Center of the Russian Federation—Institute of Theoretical and Experimental Physics. Translated from Atomnaya Energiya, Vol. 86, No. 1, pp. 16–27, January, 1999.     

Oxidative degradation of EDTA in aqueous solutions under UV irradiation

The efficiency of high-intensity pulsed UV irradiation for degradation of organic compounds in decontamination solutions was examined. The conditions ensuring virtually complete degradation of EDTA in alkaline and acidic solutions simulating decontamination solutions T and T-Ts were determined. The optimal ratios of H₂O₂ and EDTA providing complete photochemical oxidation of the complexone were evaluated.