Abstract: A seamless double-walled tube having high corrosion resistance and relative flexibility prepared by a process for brazing non-ferritic steel surfaces such as nickel chromium or stainless steel to which a suitable brazing alloy such as copper has been mechanically attache which includes the steps of instantaneously elevating the surface of the stainless steel to a brazing temperature while maintaining the material in a humidified gaseous atmosphere consisting essentially of a non-reactive carrier gas and a reactive gas present in sufficient concentrations to achieve fluxing; maintaining the surface temperature of the steel for an interval sufficient to permit fusion between the selected metal and the non-ferritic steel surface; after metal fusion has been achieved, allowing the resulting fused metal material to cool to a first lowered temperature in a controlled non-oxidative atmosphere at a rate which retards the formation of fine-grained steel crystals in the metal; and after reaching a metallurgical transfo

Abstract: An electrical machine with a superconducting rotor is constructed with a warm damper shield that uses a composite cylindrical assembly of a conductive core in a plurality of inner and outer support tubes. The conductive core is joined to axially adjacent end cylinders of high strength material by the use of mating grooves in the adjacent elements which permits them to be subjected to the forces resulting from the explosive welding of the inner and outer support tubes without damage thereto.

Abstract: A method of brazing of an outer carbon steel shell to an inner stainless steel shell, in which a stainless steel sheet material of the inner shell is rolled up with an overlap and arranged with a clearance inside the outer shell, braze material is placed in the clearance, walls of the rolled sheet material of the inner shell are forced to the inner surface of the outer shell, longitudinal edges of the sheet material of the inner shell are weld-joined to form the inner shell, air is evacuated from the clearance, and ends of the outer and inner shells are joined by circular vacuum-tight corner welds, one leg of which extends radially and has a length equal to at least one thickness of the inner shell, whereas the length of the other leg, which extends longitudinally, is equal to at least twice the thickness of the wall of the inner shell and said inner and outer shells are brazed in a furnace forming after cooling a bimetallic cylindrical article.

Abstract: A tube of a muffler for an internal combustion engine includes at least two generally rectangular sheets which are joined together at one end by crimping and wound in a tubular configuration to constitute two consecutive layers. In the tubular configuration, the other end of each of the two sheets overlaps the sheet itself and welded to the latter straddling a coupling portion where the two sheets are joined. While one of the sheets which constitutes an inner layer of the tube is made of a material which is resistive to corrosion due to chemical reactions with combustion gas and others flowing through the tube, the other which constitutes an outer wall of the same is made of a material which withstands adverse ambient conditions such as briny air and high humidity.

Abstract: A thick-walled composite metal tubing comprising an inner tubular member made of a steel pipe and an outer tubular member made of a carbon steel pipe which are press-fitted together with integration bonding thereof involving disappearance of the boundary interface at least in part of the inner and outer tubular members, and process for producing the same.

Abstract: The invention relates to a heat insulating piece comprising a transporting duct of a storage enclosure for liquids or gases, and a heat insulating covering.At least one layer of heat insulating material is deposited on the outer surface of the wall of the duct or of the enclosure, and an outer wall is disposed around said layer and is maintained with stiffeners which also reinforce the structure of the piece.

Abstract: A warm damper for a superconducting rotor is described which uses a laminar assembly of a conductive tube and a plurality of support tubes. The conductive tube is soldered to axially adjacent support tubes and the resulting composite tube is explosively welded to two or more support tubes disposed adjacent to its radially inner and outer surfaces.

Abstract: A radiant heat shield for use in a superconducting generator is described which is formed by brazing an inner and an outer tube together. The inner tube has a plurality of coolant channels machined in its outer cylindrical surface. The brazing operation consists of applying a brazing compound to the outer cylindrical surface of the inner tube prior to cold working the two tubes together, followed by a heating to a temperature in excess of the melting point of the brazing compound.

Abstract: A crack arresting device for limiting crack propagation in welded sheet structures, is made in the form of a multi-layer section of the structure, integrally interposed therein. At least in one layer of the section there is provided at least one slot located at an angle to a probable crack propagation path.

Abstract: A box tool joint member of generally tubular configuration is adapted for securement by welding to one end of a steel tube to form a drill pipe. The box tool joint member comprises a body having a cylindrical outer periphery, an internally threaded socket at one end of the body, and a weld neck of smaller outer diameter than the body adjacent to the other end of the body. A tapered transition piece connecting the neck with the adjacent end of the body provides an elevator shoulder. A correlative pin tool joint member is welded to the opposite end of the tube to complete the drill pipe.The box tool joint member has an annular band of hard facing over the outer periphery of the transition piece and extending down over the adjacent part of the weld neck and up around the adjacent part of the body. The hard facing is corrosion resistant and has a smooth finished surface. Underneath the hard facing and extending beyond both ends of the hard facing is an annular butter layer of non-hardenable steel.

Abstract: A thin-walled annular shell of high rigidity relative to its unit weight is provided. The wall of the shell is a composite material built up layerwise of glassy alloy strips of high transverse aspect ratio such that each layer is a strip wrapped at a substantially 45.degree. helix with respect to the elongate axis of the shell and with adjacent layers having alternating directions of wrap. Bonding between adjacent layers and between strips within each layer is accomplished in a selected manner such that the composite wall is structurally monolithic for thin-walled applications thereby taking substantially full advantage of the extraordinary strength properties of glassy alloy strip.

Abstract: A multi-layer container which includes a container forming a body of rotation in a tubular or at least partially spherical or conical shape, and having a plurality of layers of weldable sheet metal therewith. The first one of these layers is wrapped directly upon and around the container and the other layers are wrapped around the first layer and one upon the other. Each layer includes at least one joint extending in the longitudinal direction of the container; at least some are only partially filled with welded material.

Abstract: A metallic porous layer is formed on copper or copper alloy base material by providing a loose coating of copper or steel powder matrix, bonding metal alloy consisting of copper and phosphorous, or copper and antimony and a liquid binder, partially heating to evolve the liquid binder and further heating to 1350.degree.-1550.degree. F. to braze the bonding metal alloy to the base material and matrix.

Abstract: A bimetallic tube comprising a copper-base alloy and a reactive metal such as titanium, is produced by assembling concentrically a tubular member of each of such materials and interposing a layer of copper, nickel or silver between them, forming a bond between the reactive metal and the copper, nickel or silver and extruding the assembly. The bimetallic tube is useful for heat exchange purposes when corrosive fluids are involved and has better heat transfer properties than an all-reactive metal tube.

Abstract: A multilayer pressure vessel comprising a cylindrical portion formed by a pipe with roll strips wound on said pipe and welded to the bottom of the vessel and to its flange for the cover. Said roll strips are wound in layers along a helical line so that each subsequent layer is wound in a direction opposite to the preceding layer at a pitch of 0.2 to 2.2 of the inside diameter of the pipe. The adjacent coils are welded to each other on a helical line only in the roll strip forming the external layer.The multilayer vessel according to the invention is considerably cheaper to manufacture than the known vessels.

Abstract: A valve for use with high temperature abrasive fluids includes a valve body having an outer shell of metal, such as low carbon steel, a refractory liner attached to the shell comprising an insulating outer layer of relatively low density castable refractory material, such as alumina, an inner layer of relatively high density castable refractory abrasion resistant material attached to an inner surface of the insulating layer, and a flame sprayed ceramic coating applied to an inner surface of the abrasion resistant castable refractory layer defining a flow passage in the valve body for the passage of fluids. The valve body includes a removable core assembly containing the working parts of the valve.

Abstract: A method of repairing a tube in a heat exchanger by severing the tube and welding a sleeve inside the tube.