US 4,049,184 AGranted

Method of manufacturing polymetallic pipes

OwnerJury Iosifovich Rozengart, Viktor Yakovlevich Ostrenko +8inventors

InventorsJury Iosifovich Rozengart, Viktor Yakovlevich Ostrenko, Efim Abramovich Reznikov, Izrail Moishevich Sukonnik, Oleg Georgievich Fedorov, Robert Georgievich Kheifets, Viktor Jurievich Untilov, Jury Viktorovich Chichkov, Vladimir Khrisanfovich Kasyan, Lev Semenovich Lyakhovetsky

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Abstract

The method of manufacturing polymetallic pipes according to the invention consists of preparing the contacting surfaces of pipe billets, sealing off the gap between the billets at their ends and forming a multilayer pipe billet, heating said billet, placing it into a die and sealing off the space of the pipe billet, and filling said space with a fluid medium for exerting pressure on the internal surface of the billet, said pressure being sufficient for producing a diffusion joint. According to the invention, the temperature gradient in the body of the pipe billet is distributed so that the temperature at one end of the billet is lower than it is in its other parts.

Claims9

Dependent claims

A method of manufacturing polymetallic pipes consisting of preparing the contacting surfaces of pipe billets for producing a diffusion joint between them;

inserting said pipe billets coaxially into one another;
sealing off the gap between said pipe billets at the ends of said billets thus forming a multilayer pipe billet;
heating said multilayer pipe billet and placing it in a die;
sealing off the space of said multilayer pipe billet;
filling said space of said multilayer pipe billet with a fluid medium for building up pressure inside said space;
creating a temperature gradient in the body of said multi-layer pipe billet so that the temperature at at least one end of said billet is lower than it is in the other parts of said billet;
and selecting a pressure sufficient for making a diffusion joint between said contacting surfaces of said pipe billets.

4 more elements

Dependencies are inferred from the claim text.