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Velichko O.V.,Center for Laser Technologies | Ivanov S.Y.,Saint Petersburg State Polytechnic University | Karkhin V.A.,Saint Petersburg State Polytechnic University | Khomich P.N.,Saint Petersburg State Polytechnic University | And 2 more authors.
Welding International | Year: 2016

Three methods of completing closed (circular and annular) welded joints in welding the 1570C alloy of an Al–Mg–Sc system with a thickness of 11 and 35 mm (using the output wedge, a tool with a moving tip, friction welding) are discussed. The range of double stirring (the beginning to end of the welded joint) has a heterogeneous microstructure and mechanical properties. The distributions of the hardness of the weld metal after the first and second stirring cycle are similar if the working length of the tip is the same, and greatly differ if the working length of the tool used for the second pass is variable (as in welding with a moving tip). The ratio of the tensile strength of the welded joint and the parent metal is not lower than 0.9, which is higher than in arc welding. It is shown that the three methods of completing the closed joints can be used in practice. © 2016 Informa UK Limited, trading as Taylor & Francis Group Source


Velichko O.V.,Center for Laser Technologies | Ivanov S.Y.,Saint Petersburg State University | Karkhin V.A.,Saint Petersburg State University | Lopota V.A.,The Aerospace Corporation | Makhin I.D.,S.P. Korolev Rocket and Space Corporation Energiya
Welding International | Year: 2016

A technology is developed for single-pass friction stir welding (FSW) of 11- and 35-mm-thick plates of Al–Mg–Sc alloys. The microstructural and mechanical heterogeneity of the welded joints is investigated. The welded joints obtained under the optimum welding conditions are free from macrodefects. The strength of the welded joint equals 98% of the strength of the parent metal, which is higher than the strength of fusion-welded joints. It is concluded that the FSW of thick plates of Al–Mg–Sc alloy can be used efficiently in practice. © 2016 Informa UK Limited, trading as Taylor & Francis Group Source


Bogachev A.V.,S.P. Korolev Rocket and Space Corporation Energiya | Vorob'Eva E.A.,S.P. Korolev Rocket and Space Corporation Energiya | Zubov N.E.,S.P. Korolev Rocket and Space Corporation Energiya | Mikrin E.A.,S.P. Korolev Rocket and Space Corporation Energiya | And 3 more authors.
Journal of Computer and Systems Sciences International | Year: 2011

The problem of gravitational unloading of the angular momentum of inertial actuators of a spacecraft in the pitch channel for circular and elliptic orbits is considered using the band theory of modal control. Control laws for gravitational unloading and stabilization of a given spacecraft position unambiguously determined by the object parameters and given coefficients of characteristic equation are obtained. © 2011 Pleiades Publishing, Ltd. Source

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