Abstract: The invention relates to a method for quickly joining pipes by chamfering the end of a thin pipe, forcefully socket jointing this pipe in a pipe of the same diameter, dismantling the two pipes by traction. The two pipes can thereafter be rejoined easily and quickly by socket-jointing.

Abstract: A method for the production of a composite hollow body formed of aluminum alloys and composed of two layers having differing structure. One layer of the hollow body is intended to operate in contact with a mobile surface and is produced by extruding a mixture of particles of a hypereutectic silicon alloy having fine grains and an addition product. The other layer is selected from among alloys having certain particular properties and has the structure of a cast and wrought product. The present method particularly consists of the step of joining the two layers by coextrusion on a mandrel in an inverse extrusion press. The composite hollow bodies so produced are used in the production of linings for internal combustion engines or for jacks.

Abstract: The invention provides a method and apparatus for treating a molten metal or alloy using liquid and solid flux, the invention comprising passing the metal or alloy through a column provided with an outlet syphon lined with solid granules and liquid flux, at least a proportion of the granules comprising a solid flux having a melting point which is higher than that of the liquid flux and which is higher than the temperature of the metal to be treated. The solid granules can be introduced in a removable interchangeable cartridge. The invention finds utility in the advanced purification of aluminum-based alloys by elimination of ultimate inclusions.

Abstract: A calcining installation of improved thermal efficiency comprises a long rotary tubular kiln having an upstream inlet, a downstream outlet and an air inlet at the downstream end. A burner is positioned in the upstream half of the kiln, the upstream part of the kiln constituting a calcining zone and the downstream kiln part constituting a cooling zone for the calcined material. A cyclone separator for separating dust from the kiln flue gases has an inlet and a dust outlet, and an additional cyclone separator has an inlet, a gas outlet and a material outlet connected to the upstream end of the kiln. A pipe connects the gas outlet of the additional cyclone separator to the inlet of the cyclone separator, the pipe having a vertical portion and an inlet for the raw material in the lower part of the vertical portion.

Abstract: The invention relates to a process and an apparatus for improving the operation for low pressure casting of components such as aluminum and magnesium alloys by controlling the pressure of the inert gas used to cause the metal to flow downwards into the injection tube after the casting of a component at a value higher than that prevailing in the interior of the furnace, the difference between the two pressures being adjustable to a constant value, and enabling two different rates of flow of the inert gas to be established.

Abstract: The invention concerns a process for assembling aluminum-based members and steel members.This process is characterized by:covering the steel member with a metal film on the part of the surface to be assembled,disposing grains of silicon at the aluminium-steel interface,providing protection from oxidation for the faces to be assembled,heating the members so as to achieve an interface temeperature of from 500.degree. C. to 650.degree. C. and applying a pressure which is sufficient to totally or partially expel the liquid eutectic which is thus formed,cooling the assembly.The assembly which is produced in this way is used in particular in so-called `clad` connecting members for igneous electrolysis vessels, in armour plating requiring high mechanical strength and in all cases where connections are to be made, which have good electrical and mechanical properties, for continuous use in a temperature range from at least -200.degree. C. to at least +450.degree. C.

Abstract: The invention concerns a new process for quenching metallic pieces and intended to limit the stresses engendered by quenching without essentially affecting the characteristics.This process consists of quenching the pieces by immersion in a binder of the clay type suspended in water and with a mineral component such as magnetite, ferrosilicon, baryte. Products to inhibit corrosion, antifoam, or antiflocculant agents can be added to this suspension.The invention is applied to metallic pieces, but particularly to high resistance aluminum alloy pieces which are made subject to faults caused by the stresses of excessive quenching because of their form or their dimensions.

Abstract: An aluminum alloy for use in the production of enameled articles or articles subjected to elevated temperature having the following composition (% by weight):______________________________________ Mn 0.9 to 1.5 Si 1.0 to 1.5 Cr 0.05 to 0.2 Mg < 0.2 Cu < 0.2 Fe .gtoreq. 0.4 Ni .gtoreq. 0.05 Fe + Ni + Co 0.8 to 2 ______________________________________remainder aluminum and normal impurities.

Abstract: A process for the thermal treatment of a relatively thick product made of a copper-containing aluminum alloy of the 7000 series, the invention involving a solution heat treatment, quenching and tempering in three steps:(1) preliminary tempering at between 100.degree. and 150.degree. C. for five minutes to 24 hours;(2) intermediate tempering; and,(3) final tempering for 2 to 48 hours at between 100.degree. and 160.degree. C.The intermediate tempering step comprises a rapid rise in temperature in the zone at 150.degree. to 190.degree. C. followed by an evolution .theta.(t) above 190.degree. C. for a period T, such that: ##EQU1## is between 1 and 4, K=1.5 except for certain alloys where K=3. T and t are expressed in seconds, .theta.(t) is expressed in .degree.K. and is between 463.degree. and 523.degree. K. The present process provides increased mechanical strength to the product as well as a high resistance to stress corrosion.

Abstract: A method is disclosed for coating aluminum electrical conductors with an oxide of a controlled thickness to minimize the subsequent in situ deposition of an insulating layer of an electrically resistive oxide at the junction of the aluminum conductor and another electrical conductor.

Abstract: The invention relates to a process for the thermal treatment of aluminum alloys containing zinc, magnesium and copper as main alloying elements, and the products manufactured by this process and having an average particle diameter of Al-Mg-Cr phase of between 800 A and 1000 A. This process involves carrying out a treatment at high temperature for a sufficiently short period to prevent coalescense into particles which are too large. This treatment is preferably carried out at the homogenization stage for thin products and at the final dissolution stage for thick products. The invention is applied, in particular, to the manufacture of thin or thick sheets for the aeronautical industry.

Abstract: A process for the thermal treatment of thin products made of 7000 series aluminum alloys comprising a solution heat treatment, quenching treatment and a tempering treatment in three stages:pretempering between 100.degree. and 150.degree. C. for 5 minutes to 24 hours;intermediate tempering; and,final tempering between 100.degree. and 160.degree. C. for 2 to 48 hours.Intermediate tempering comprises a rapid rise in temperature to 190.degree. C. followed by a treatment at a temperature .theta.(t) between 190.degree. and 250.degree. C. for a total duration T in such a way that the function: ##EQU1## is comprised between 0.5 and 1.5; and T and t being expressed in seconds and .theta.(t) in .degree.K.This tempering treatment imparts to the products treated both high mechanical characteristics and a high resistance to stress corrosion.

Abstract: Process for recovering aluminum in the form of a specific acid sulfate from an initial solution containing aluminum in the form of dissolved aluminum sulfate hydrate in which the specific acid sulfate is of the formula Al.sub.2 (SO.sub.4).sub.3.0.5H.sub.2 SO.sub.4.11 to 12 H.sub.2 O and in which the initial solution is sequentially treated in a series of crystallizers, wherein successive crystallizers are maintained at a predetermined decreased generally fixed temperature such that in each crystallizer a state of supersaturation of aluminum acid sulfate exists and the parameters attendant operation of each crystallizer insure that a state of static equilibrium of precipitation of product is generally reached before the process solution/slurry is passed to a successive crystallizer, or filtered for recovery of product.

Abstract: A means of compensating the magnetic field induced by the adjacent line in series of high intensity electrolysis cells placed in a transverse direction. A compensating conductor traversed by a direct current which induces an antagonistic field neutralizing the parasitic field of the adjacent line is arranged along each line on the internal side and/or on the external side. Excellent compensation is achieved by regulating the intensity in each conductor and the distance between the conductor and the line.Application may be to series of igneous, very high intensity electrolysis cells for the production of aluminum.

Abstract: A piston made of aluminum alloy with its surface treated by anodization in a phosphoric medium, onto which a layer of an anti-friction metal is deposited by electrolysis, so that the piston does not seize on contact with a cylinder with its internal wall made of aluminum alloy.

Abstract: Process for the recovery of H.sub.2 SO.sub.4 from dilute sulfuric acid solutions containing combined acid sulfates by heating these solutions in the presence of excess ammonium sulfate to a temperature from between about 100.degree. and 160.degree. C. until a concentration of free H.sub.2 SO.sub.4 between 50 and 59% by weight is obtained to precipitate the combined acid sulfates.

Abstract: This invention concerns production by extrusion of hollow cylindrical bodies starting with granulated alloys of aluminum containing silicon. It consists of preparing the composition of the alloy in a liquid form, producing granules by centrifugal pulverization or atomization, introducing the granulated material into an extrusion press to obtain the hollow profile by extrusion and extruding the granular material within to form a cylindrical body. This invention is applicable to form hollow bodies and particularly sleeves of motors of high content silicon aluminum alloy through which size and distribution of primary silicon is improved over traditional casting methods.

Abstract: A method and apparatus for casting and rolling and heat treatment for aluminum alloys with structural hardening, which are continuously cast and rolled to produce machine wire, comprising, carrying out a first rolling operation at a reduction rate of 20 to 85% on discharge from the casting machine, continuously reheating the already rolled blank to bring it to a temperature between 450.degree. and 550.degree. C., then carrying out final hot rolling to the definitive section of the machine wire. The method applies particularly to the production of wire made of aluminum alloy Al-Mg-Si for the manufacture of electrical conductors.

Abstract: A valve for use in an apparatus for supplying molten metal by means of a siphon to a furnace. A valve formed by a tube provided with two flanges is placed at the upper part of the siphon, this tube extending by a certain length below the level of the flanges, so as to form an annular space with each of the branches of the siphon in which the gas is trapped during decanting, which prevents the gaskets from being in contact with the molten metal.

Abstract: The invention concerns electrical conductors of Al-Fe alloys containing from 0.5 to 5% of Fe. Conductors having a highly fibered structure which are stable up to 350.degree. C and have a range of mechanical and electrical characteristics which are remarkable and an excellent surface state are obtained by press drawing of granules of Al-Fe alloys obtained by centrifugal spraying of the liquid metal. Application to electrical conductors in the form of wires, cables and various shaped sections such as flat sections and strips which may be flexible or rigid.