An assembly including a ceramic body. The assembly comprises a tungsten coupling attached to the ceramic body with a first joint that forms a first helium tight seal between the ceramic body and the tungsten coupling and where the first helium tight seal maintains its integrity at a temperature over 400 C. The assembly includes a metal body attached to the tungsten coupling with a second joint that forms a second helium tight seal between the metal body and the tungsten coupling and where the second helium tight seal maintains its integrity at a temperature over 400 C. A method. A mixture. A coupling.

A guiding member, having a body provided with a bore for mounting a mobile element is presented. The body consists of a metallic material. The bore has a surface layer treated against jamming over a diffusion depth of less than or equal to 0.6 mm. The surface layer has a hardness of greater than or equal to 500 Hv1 over a depth of between 5 and 50 ?m.

Steel material for composite pressure vessel liners that, when used as raw material for manufacturing a composite pressure vessel liner, yields a liner having sufficient strength and a high fatigue limit and enables the manufacture of an inexpensive composite pressure vessel is provided. Steel material for composite pressure vessel liners comprises: a chemical composition containing, in mass %, C: 0.10% to 0.60%, Si: 0.01% to 2.0%, Mn: 0.1% to 5.0%, P: 0.0005% to 0.060%, S: 0.0001% to 0.010%, N: 0.0001% to 0.010%, and Al: 0.01% to 0.06%, with a balance being Fe and incidental impurities; and a metallic microstructure in which a mean grain size of prior austenite grains is 20 m or less, and a total area ratio of martensite and lower bainite is 90% or more.

A cross tube for a helicopter skid landing gear, including a monolithic metallic tube having a central portion extending transversely between two end portions with longitudinal central axes of the central portion and of the end portions being located in a plane, where the central portion has inner and outer heights, the end portions each have inner and outer heights, and the inner and outer heights of one of the central portion and the end portion are respectively greater than the inner and outer heights of the other of the central portion and the end portion. A skid tube with two portions with cross-sections having one or both of different orientations with respect to one another and different dimensions with respect to one another, and a method of forming a structural tube for a helicopter skid landing gear are also provided.

Provided is a round billet capable of reducing damage on a piercing plug in a method of producing a seamless metal tube with a Mannesmann process. The round billet (5), for use in a seamless metal tube, to be produced into a seamless metal tube with a Mannesmann process includes a body having a hole (6) formed in an axial direction of the body. The hole (6) includes an aperture (6a) opening at least at one end face of the round billet (5), and a tapered portion (61) continued to the aperture (6a) and having a diameter gradually increasing toward the aperture (6a).

An assembly including a ceramic body. The assembly comprises a tungsten coupling attached to the ceramic body with a first joint that forms a first helium tight seal between the ceramic body and the tungsten coupling and where the first helium tight seal maintains its integrity at a temperature over 400 C. The assembly includes a metal body attached to the tungsten coupling with a second joint that forms a second helium tight seal between the metal body and the tungsten coupling and where the second helium tight seal maintains its integrity at a temperature over 400 C. A method. A mixture. A coupling.

The present invention provides a panel having a profile. The panel includes a first longitudinal edge including in succession a first longitudinal rib, a flange, and a second longitudinal rib. Each longitudinal rib includes an upper central part and two lateral wings. The panel also includes a central part and a second longitudinal edge including in succession a first lateral portion, a protruding part, and a second lateral portion. The lateral portions have a configuration permitting them to at least partially overlap the upper central parts of the first and second longitudinal ribs. The protruding part is capable of receiving a fastener. The present invention also provides an assembly of panels marginally overlapping, a roofing and a kit for fabrication of roofing.

A flux for use in soldering comprises a first constituent and one or more secondary constituents that is selected from solvents, thickeners, and/or metal oxide reducing agents. The flux has a temperature profile in which the flux is in a non-flowable inactive state at temperatures at and below a maximum storage temperature that is above about 27 C., a liquid active state at an activation temperature, and a flowable inactive state in a deposition temperature range above the maximum storage temperature and below the activation temperature. A solder material comprises solder particles dispersed in the flux.

A high strength joint material. A material for a joint between a ceramic body and a metal body. A material for a joint between a ceramic body and a ceramic body.

Steel material for composite pressure vessel liners that, when used as raw material for manufacturing a composite pressure vessel liner, yields a liner having sufficient strength and a high fatigue limit and enables the manufacture of an inexpensive composite pressure vessel is provided. Steel material for composite pressure vessel liners comprises: a chemical composition containing, in mass %, C: 0.10% to 0.60%, Si: 0.01% to 2.0%, Mn: 0.1% to 5.0%, P: 0.0005% to 0.060%, S: 0.0001% to 0.010%, N: 0.0001% to 0.010%, and Al: 0.01% to 0.06%, with a balance being Fe and incidental impurities; and a metallic microstructure in which a mean grain size of prior austenite grains is 20 m or less, and a total area ratio of martensite and lower bainite is 90% or more.