Aluminum cell current supply leads connection method

FIELD: methods for connecting by welding electric current supply buses arranged in zone subjected to influence of outer magnetic fields.

SUBSTANCE: additive metal placed in casting mold is heated and melted by means of electromagnetic field of HF current induced by inductor arranged in casting mold or in its lid. Plates of cathode slope portion are stepwise fixed from down to up on cathode bus in the form suitable for connection. Flux is applied onto welded surfaces of parts. Additive metal is cyclically fed to welding zone through metallic disc mounted in outlet opening of casting mold or through valve mounted inside outlet opening of casting mold or from intermediate vessel. Melting temperature of metallic disc is equal to that of additive metal or exceeds it.

EFFECT: high quality of electrical and mechanical welded joints formed in operating electrolysis vessel at condition of outer magnetic fields action without interrupting electric current load of current supply buses and without contamination of atmosphere with combustion products.

6 cl, 4 dwg, 1 ex

 

The invention relates to ferrous metallurgy, in particular to the electrolytic production of aluminum, and can be used in industries where there is a need for connection by welding located in the areas of external magnetic fields busbars. Between Shin has allowed potential, leading to the process flow of current through molten weld shape.

The connection busbars (conductors) electrolytic cells for aluminum production, for example in the repair of node connection: anode anode risers with tires, cathodic slopes with cathode tires or Blums, in existing buildings electrolysis is performed in an external magnetic field. Between the joined Shin has allowed potential due to technological mode of operation of the electrolysis, which is not always possible to resolve without disconnecting the current series.

The presence of this potential leads to the fact that you are running the connection through the molten metal (weld pool)that connects the bus is part of the process of the electrolysis current. The interaction of the magnetic field with a specifically directed transverse components of the external magnetic field produces a force producing molten metal from the connection zone (MHD effect).

Known JV the property of the welded connection conductive aluminum elements by contact of the molten filler metal welded aluminum elements. To melt the filler metal is used a mixture of reagents comprising a reducing agent, a metal compound, which exothermically restored in such a reducing agent. The filler material does not enter into chemical reaction with the reducing agent. The materials of the reaction are contained in the mould over the outlet on the fusible disk (disc). When materials are consumed in the upper part of the mould, resulting in an exothermic reaction produces molten metal and slag. The molten metal melts the disk and leaves it through an outlet in the weld chamber for welding parts. The slag is separated from the molten metal rising to the top layer of the reaction (U.S. patent 6316125, IPC With 22 1/05, 2001).

The main disadvantages of this method are: high cost of consumables (mixture of reagents and consumables), the high cost and low reliability of the equipment and air pollution by combustion products heat the mixture.

Known welding method and welding by melting, which produces heating and melting the filler material and the additional material. The additional material density less than the density of the filler and the base material, and the filler material is heated by its contact with bathtub races is Lavrenova additional material. The formation of the weld metal produced with the assistance of the mold. Heating baths additional material is carried out by the currents induced therein by means of the inductor is placed in the mould walls (patent USSR No. 1797543, the IPC 23 To 13/00, 1993).

This method of obtaining the contact connection allows fusion welding, in which the heating and melting the filler material is due to its contact with the molten bath of additional material. Heating baths additional material during the entire process carried out by the currents induced therein by means of the inductor, which is placed in the mould walls.

The method has the following disadvantages:

the need for additional material to heat the filler material;

the complexity of extracting additional material from the heated bath after completion of the welding process;

the impossibility of making contact connection of parts with complex surfaces;

the impossibility of making contact connection details placed in mutually intersecting planes;

the impossibility of making contact connect more than two parts per cycle, located in different planes.

The closest technical sown the STI solution selected as a prototype, is a way of connecting leads of electrolytic cells for aluminium production, under the potential in an external magnetic field, comprising heating to melt the filler metal and feeds it into the connection zone. The connection is performed by fusion welding with alternating current of high frequency and the creation of an additional magnetic field in the weld zone, and for welding uses an alternating current frequency of 20,000 Hz.

The prototype also has all the above-mentioned disadvantages of the similar.

The task of the invention is to provide a method of the connection busbars (conductors) cells, providing high quality electrical and mechanical welded joint obtained in the current of the electrolysis case, in the action of external magnetic fields, without removing the current load busbars, without contamination of the atmosphere by combustion products. Another objective is the elimination of additional materials to heat the filler material and costs associated with its use.

To solve the problem in the method of connecting leads of electrolytic cells for aluminium production, including heating to melt the filler metal and feeds it into the connection zone, according to the present invention R is the fusion of the filler metal is carried out in a mold by means of an electromagnetic field of high frequency current, induced by the inductor is placed in a mold and the cathode plate of the shutter is fixed on the cathode bus in the form for the connection speed from the bottom up, and on the joined surface of the applied flux, destroying the oxide film.

Way to complement private distinctive features aimed to the solution of assigned tasks.

Filler metal in the joint zone serves periodically when it reaches a temperature equal to or above the melting temperature.

Filing filler metal in the joint zone is produced from the intermediate containers.

Supply filler metal to produce a metal disc mounted on the outlet of the mold, or through a valve mounted in the outlet opening of the mold.

Use a metal disk, the melting temperature of which is equal to or greater than the melting temperature of the filler metal.

Use a mold placed in the cap inducer.

Applied to the welded surface flux contributes to the destruction of refractory film of aluminum oxide (Al2About3), which prevents the process, and allows you to get a good connection.

Fixing of connected components in the form of connection allows you to set the details in relation to each other in different pleskot the x, to connect more than two complex components.

Periodic flow of filler metal in the joint zone at a temperature of equal to or higher than the melting point of the filler metal, allows you to choose the optimum temperature of the filler metal and to obtain a good connection.

Periodic flow of filler metal in the joint zone allows you to manage multiple inductors placed in several casting forms, one power plant.

Comparative analysis of the prototype shows that the proposed method differs in that the heating and melting of the filler metal is placed in a mold carried out by the electromagnetic field of high frequency current induced by the inductor is placed in a mold. In addition, in the invention produce fixation of connected plates of the cathode descent in the form of a stepped bottom-up and connected to the surface of the applied flux, destroying the oxide film.

Thus, the inventive method of the connection meets the criterion of "novelty."

The comparison of the proposed solutions not only prototype, but also with other technical solutions in this field of technology is not allowed to reveal in them the features that distinguish the proposed solutions from the prototype is, that makes it possible to conclude that the criterion of "inventive step".

The connection method is illustrated by drawings, where:

figure 1 - diagram of the device for implementing the method, where the inductor is embedded in the mold, the flow of filler metal in the joint zone is produced through the valve plate of the cathode descent to the cathode bus fixed speed from the bottom up;

figure 2 - diagram of the device for implementing the method, where the flow of filler metal produced through a fusible metal disc;

figure 3 - diagram of the device for implementing the method, where the melting of the filler metal in a mold to produce an electromagnetic field of high frequency current induced by the inductor placed in the lid of the mold;

4 is a diagram of a device for implementing the method for connecting the anode or cathode aluminum tire electrolyzer large cross-section.

In the figures showing: 1 - mold with integrated inductor, 2 - filler metal, 3 - form compounds, 4 - plate cathode descent, fixed speed from the bottom up, 5 - anode or cathode aluminum bus electrolyzer heavy gauge, 6 - valve, 7 - cover mold, 8 - fusible metal disc, 9 - mold without the inductor,10 - cover the mold with the inductor.

An example of a specific implementation of the proposed method of connecting leads of electrolytic cells for aluminium production, for the case shown in figure 1, when the connection is subjected to plate cathode descent, recorded stepped up at the cathode bus. Before connection of the cathode plate of the shutter 4 are fixed stepped up at the cathode bus 5. Then set the form for compound 3, the contact surface is applied flux and is set mold with a built-in inductor 1. Mold is filled with a filler metal 2, is closed by a cover 7, is heated to a temperature equal to or higher than the melting point of the filler metal through the valve 6 filler metal is fed to the connection.

An example of a specific implementation of the proposed method of connecting leads of electrolytic cells for aluminium production, for the case shown in figure 4, when the connection is subjected to anodic or cathodic aluminum bus electrolyzer large cross-section. First aluminum bus electrolyzer large cross-section 5 is fixed in the form for compound 3. The contact surface is applied flux is set mold with a built-in inductor 1, the casting fo the mA is filled with filler metal 2, is closed by a cover 7, is heated to a temperature equal to or higher than the melting point of the filler metal through the fusible metal disc 8, a filler metal is fed to the connection.

An example of a specific implementation of the proposed method of connecting leads of electrolytic cells for aluminium production, when the parts to be welded conductors cells are located at a distance greater than the length of the conductors connecting the power plant and the inductor. A filler metal is heated in a mold to a temperature equal to or higher than a melting temperature, is poured into the intermediate tank, a buffer tank with filler metal is transferred to the connection zone, a filler metal is fed to the connection.

The proposed method allows to obtain a connection busbars (conductors) cells, providing its high quality electrical and mechanical properties, the current of the electrolysis case, in the action of external magnetic fields, without removing the current load busbars, without contamination of the atmosphere by combustion products, without the use of additional materials for heating the filler metal and costs.

1. The method of connecting leads of electrolytic cells for aluminium production, including at the roar before the melting of the filler metal and feeds it into the connection zone, characterized in that the melting filler metal is carried out in a mold by means of an electromagnetic field of high frequency current induced by the inductor is placed in a mold, with the cathode plate of the shutter is fixed on the cathode bus in the form for the connection speed from the bottom up, and on the joined surface of the applied flux, destroying the oxide film.

2. The method according to claim 1, characterized in that the filler metal in the joint zone serves periodically when it reaches a temperature equal to or above the melting temperature.

3. The method according to claim 1, characterized in that the flow of filler metal in the joint zone is produced from the intermediate containers.

4. The method according to claim 1, characterized in that the supply filler metal to produce a metal disc mounted on the outlet of the mold, or through a valve mounted in the outlet opening of the mold.

5. The method according to claim 4, characterized in that use metal disc, melting point which is equal to or greater than the melting temperature of the filler metal.

6. The method according to claim 1, characterized in that the use of a mold placed in the cap inducer.



 

Same patents:

FIELD: non-ferrous metallurgy; structural members of electrolyzers used for production of aluminum by electrolysis.

SUBSTANCE: detachable fastener is made in form of two rigidly interconnected vertical plates provided with ports for passage of cathode rod and wedge pair located in between them; stop for wedge is swivel and wedge is provided with locking member. Besides that stop for wedge is made in form of cylinder with longitudinal shear for wedge; steel plate located between contact plate of cathode lead and wedge is rigidly connected with contact plate of cathode lead.

EFFECT: enhanced reliability and stability of electric contact of cathode with bus; reduction of labor input.

3 cl, 2 dwg

FIELD: production of aluminum by electrolysis of molten cryolite salts in electrolyzers at two-row cross arrangement.

SUBSTANCE: electrolyzer bus arrangement includes anode buses connected with anodes by means of anode rods, cathode buses made from cathode rods with flexible stacks projecting on both sides of electrolyzer cathode casing, sectional cathode buses on input and output sides of electrolyzer cathode casing, connecting buses, joint for connection of cathode buses with anode buses in adjacent electrolyzer row made in form of bus modules, sectional cathode buses; anode risers are combined in bus modules: at least one anode riser in each module on input and output sides of electrolyzer; anode risers on input side are connected with cathode rods both on input and output sides of previous electrolyzer; anode risers on output side are connected with cathode rods on output side of previous electrolyzer. Each bus module makes it possible to pass 10-100% of current of series, preferably 18-30%. Anode risers on input side make it possible to distribute 1/2-3/4 of module current and anode risers on output side make it possible to pass 1/2-1/4 of module current; they are located symmetrically relative to short planer axle of electrolyzer. Connecting buses pass under electrolyzer bottom; all connecting buses of extreme modules or part of them embrace end faces of electrolyzer and are located at level of molten metal. Number of cathode rods on half closer to adjacent row on input side exceeds that on opposite half.

EFFECT: increased productivity of electrolyzer due to increased current intensity; reduced mass of buses; low operational expenses.

6 cl, 3 dwg

FIELD: electrolytic production of aluminum; arrangement of electrolyzer buses.

SUBSTANCE: bus arrangement of aluminum electrolyzer at longitudinal position of electrolyzers in body has cathode rods connected with cathode bus stacks located on longitudinal sides of electrolyzer; each of them consists of at least one cathode bus, input and output anode risers connected with cathode bus stacks by means of connecting buses and with anode buses by means of transmitting buses. Anode buses are provided with jumpers at input and output and with additional jumper. To obtain the required current load on anode mass of subsequent electrolyzer, current load supply electric circuits have differentiated electric resistance. Bus arrangement may be made of four risers: two input risers are located at input end face of electrolyzer in projection of its cathode arrangement and two output risers are located on logitudinal sides at distance from central transversal axis of electrolyzer equal to 0.05-0.16 of electrolyzer length; bus arrangement is made at the following distribution of current load among risers, %: LH input riser, 15-35; RH input riser, 10-40; LH output riser, 15-35 and RH output riser, 10-40.

EFFECT: optimization of electromagnetic characteristics of process, optimization of metal and electrolyte circulating rate; improved parameters of process.

2 cl, 1 dwg

FIELD: electrolytic reduction of aluminum.

SUBSTANCE: proposed electrolyzer includes many collecting rods. Each collecting rod has elongated first section which is brought in contact with cathode and at least one end section which passes through one of side walls of electrolyzer and is electrically connected with electric current carrier. Specific feature of electrolyzer consists in availability of core in each first section of each collecting rod for control of current distribution; this core is made from material possessing high specific electric conductivity and external envelope made from material of higher mechanical strength and chemical resistance as compared with material of core; end section of each collecting rod is made from material of low specific heat conductivity.

EFFECT: reduced losses of heat; maintenance of specific thermal balance of cathode; reduced power requirements.

14 cl, 6 dwg, 1 tbl

FIELD: chemical industry; equipping of powerful aluminum electrolyzers with the bus-bars.

SUBSTANCE: the invention is pertaining to the field of equipping of an aluminum electrolyzer with bus-bars. Equipping of the powerful aluminum electrolyzer at their two-row longitudinal location in the body contains: cathode rods, divided into groups, each of which is connected to a separate packet of cathode bus-bars; the anode buses connected by rising mains located along both sides of a longitudinal cathode casing with packets of cathode buses of a preceding along the current run electrolyzer, two cross-section buses connecting a packet of cathode buses located on the right side of an outlet butt of the cathode casing of a preceding electrolytic bath with the left-side inlet rising main and the left-side outlet rising main with the right-side anode bus and is made with three rising mains. At that the current loading to the left-side outlet rising main is fed by separate packets of buses, a part of which is connected with the left-side anode bus in a point dividing its length in the following ratio (1.9-2.,3 : 1), and the rest part of the buses is connected with the right-side anodic bus in the point dividing its length in the ratio (3.5-4.5 : 1), and the inlet and outlet ends of the anodic buses are connected by jumpers. At that distribution of the current-loading on the rising mains makes (in %): the left-side inlet rising main - 32-35, the right-side inlet rising main - 40-42, the left-side outlet rising main - 24-26, at that 8-10 % of the current loading to the left-side outlet rising main is fed by a separately made packet of cathode buses from the left-side of the cathode casing of the preceding electrolytic bath. The invention ensures increase of current efficiency up to 90.2%.

EFFECT: the invention ensures increase of current efficiency up to more than 90%.

3 cl, 1 dwg

FIELD: chemical industry; equipping of an aluminum electrolyzing bath with bus-bars.

SUBSTANCE: the invention is pertaining to equipping of an aluminum electrolyzing bath with bus-bars. Equipping of an aluminum electrolyzing bath with the upper two-sided feeding of an electrical current to the anode at a two-row longitudinal location of the electrolyzers in the body contains: cathodic and anodic buses coupled by three rising mains with cathodic buses of a preceding electrolyzing bath; two cross-sectional buses connecting the cathodic buses of the right side of a preceding along the current run electrolyzing bath with an inlet terminal of the left-hand anode bus; and the cathodic buses of the left side of the preceding electrolyzing bath - with an outlet terminal of the right-side anode bus. At that the made with three rising mains bus-bar has the following distribution of the current among the rising mains, %: the right-side inlet rising main - 39-42, the left-side inlet rising main - 33-35, the left-side outlet rising main - 25-27. At that 9-11 % of the current loading is fed to the left-side inlet rising main from the right side of a cathode bus-bar of the preceding electrolytic bath through a transversal bus connecting the cathode buses of the right side of a preceding current run direction electrolytic bath with an inlet terminal of the left-side anode bus and located on the an inlet butt of the cathode below a marker pip of the bottom; 15-17 % of current-loading of the left-side outlet rising main is fed to the left-side anode bus;, 10-12 % is fed to the right anode bus through the transversal bus connecting the cathodic buses of the left-side of the preceding electrolytic bath with an outlet terminal of the right anodic bus and located above the level of a melt in an electrolytic bath. At that the current-loading is fed to the left-side outlet rising main by separate packs of buses from the left-side of the cathodic bus-bar of the preceding electrolytic bath, and anodic buses on an inlet and an outlet are supplied with jumpers. The invention ensures minimization of the vertical component of the magnet field, its symmetrical distribution, alternating vibrations, an even distribution of the current-loading on an anodic block.

EFFECT: the invention ensures minimization of the vertical component of the magnetic field, its symmetrical distribution, alternating vibrations, an even distribution of the current-loading on an anodic block.

1 dwg

FIELD: electrolytic production of aluminum, possibly structures of busbars of powerful aluminum cells with fired anodes arranged crosswise in housing.

SUBSTANCE: busbars include cathode rods connected with packs of cathode buses; anode struts connected through cross transmission buses with packs of cathode buses; anode buses provided with jumpers and connected with anodes struts. Busbars include at least five anode struts with next distribution of electric current loads for strut: central and boundary anode struts, 0.8 -1.0 mean electric current load for strut, remaining struts, 1.0 -1.25 mean electric current load for strut determined according to given expression. All cathode rods at each lengthwise side of cell are connected with one cathode pack having at least one cathode bus. Portions of packs of cathode buses, transmission buses and anode struts supplying current load to next cell have differentiated electric resistance providing predetermined electric current load.

EFFECT: lowered circulation speeds of metal and electrolyte, optimal electric current distribution by cathode and anode busbars, reduced electric current losses.

1 dwg

FIELD: busbars for aluminum cells designed for producing aluminum at lengthwise two-row arrangement of cells in housing.

SUBSTANCE: inlet anode struts of busbars are arranged at near (along electric current direction) end of cell; outer struts are arranged along lengthwise sides of cell. Right outlet anode strut is spaced from cross axis of cell by distance consisting 0.05 - 0.12 of length of cell. Left outlet strut is spaced by distance equal to 0.08 - 0.16 of length of cell. Zone of arrangement of outlet struts provides lowered value of skewing of metal-electrolyte surface.

EFFECT: reduced circulation speed of melt metal.

2 cl, 1 dwg

FIELD: non-ferrous metallurgy, possibly systems for sustaining operation modes of aluminum cells, mainly devices for connecting cathode bus with cathode rod of aluminum cell.

SUBSTANCE: current supply lead includes electric current supply unit in the form of set of flexible aluminum bands. One end of said set is rigidly connected with cathode bus; its other end is detachably connected with steel cathode rod through adapter whose contact surface is coated with copper layer. Current supply lead also includes additional adapter for connecting ends of set of flexible aluminum bands with cathode bus and with two metallic plates. Said adapter has П-shaped recess; ends of set of flexible aluminum bands are connected one to other, to lower planes of П-shaped recesses of adapters and to metallic plates by means of explosion welding. At side of cathode rod adapter and metallic plate are made of steel. At side of cathode bus adapter and metallic plate are made of aluminum. At side of cathode bus adapter and metallic plate are made of steel. Layer of aluminum is applied onto lower surface of adapter.

EFFECT: lowered electric current loss in place of contact of current supply lead and cathode rod, improved mechanical strength of connection.

4 cl, 2 dwg

FIELD: nonferrous metallurgy.

SUBSTANCE: the invention is dealt with nonferrous metallurgy, in particular, with devices and methods of correction of the magnetic fields at production of aluminum by an electrolysis from fused salts in an electrolyzer of a square form. The method provides for a passing of a correcting current through a bus-duct electrically not linked with the electrolyzer to independent sections of the bus-duct, which magnetic field interacts with an operating current of a vertical direction in the molten aluminum with origination of longitudinal force of compensation of the longitudinal skews of a boundary of an electrolyte - the molten aluminum, bus ducts caused by external magnetic fields of bus-ducts and adjacent electrolyzers. At the initial stage after start-up of the electrolyzer or an anodic effect quenching, a permanent electric current is fed onto all independent sections of the bus-duct; and in periods between anodic effects an alternating current is fed onto the middle independent section of the bus-duct, and in a mode of an approaching anodic effect they fed a pulsed alternating in-phase current with a frequency equal to the resonance frequency of standing waves at the border of an electrolyte - molten aluminum on all is fed onto all independent sections of the bus-duct. The device contains a bus-duct for gating through of the correcting current. The bus-duct is made in the form of a closed circuit formed by pipes made out of a nonmagnetic weak-conductive material and separated by bonding strips being in parallel to the short side of the bath for at least three independent sections and laid along the internal perimeter of the ferromagnetic body of the bath under a laying of refractory bricks. Inside the sections there are control windings with a possibility to be connected to independent power supplies a permanent, variable or pulsed alternating current. The invention allows to eliminate a longitudinal skew of the surface of the molten aluminum, caused by external magnetic fields of bus-ducts and adjacent electrolyzers, to quench the dangerous oscillations and to intensify process in the interpole space.

EFFECT: the invention allows to compensated a longitudinal skew of the molten aluminum surface, to quench the dangerous oscillations, to intensify process in the interpole space.

2 cl, 2 dwg

FIELD: processes and equipment for joining by rolling different type liquid and solid metals, possibly manufacture of clad metallic sheets and articles in different branches of industry.

SUBSTANCE: method comprises steps of pouring melt metal onto surface of different solid main metal coated with flux for soldering; rolling metals under pressure for rapid cooling of melt metal, crystallizing it and joining with surface of solid main metal due to metallurgical joining between two or more metals. Plant for performing the method includes mounted according to desired order: machine for uncoiling sheet metal from coil; vessel with soldering flux; unit for drying and heating; casting nozzle; rolls with inner cooling and machine for coiling sheet metal. Ladle for melt metal is arranged over casting nozzle. Main frame of plant is arranged under said ladle.

EFFECT: enhanced strength of different metals joints, low cost of products, improved efficiency, high quality of sheet metal, relatively small cost of plant, decreased power consumption.

14 cl, 6 dwg, 3 ex

FIELD: processes and equipment for joining by rolling different type liquid and solid metals, possibly manufacture of clad metallic sheets and articles in different branches of industry.

SUBSTANCE: method comprises steps of pouring melt metal onto surface of different solid main metal coated with flux for soldering; rolling metals under pressure for rapid cooling of melt metal, crystallizing it and joining with surface of solid main metal due to metallurgical joining between two or more metals. Plant for performing the method includes mounted according to desired order: machine for uncoiling sheet metal from coil; vessel with soldering flux; unit for drying and heating; casting nozzle; rolls with inner cooling and machine for coiling sheet metal. Ladle for melt metal is arranged over casting nozzle. Main frame of plant is arranged under said ladle.

EFFECT: enhanced strength of different metals joints, low cost of products, improved efficiency, high quality of sheet metal, relatively small cost of plant, decreased power consumption.

14 cl, 6 dwg, 3 ex

FIELD: methods for connecting by welding electric current supply buses arranged in zone subjected to influence of outer magnetic fields.

SUBSTANCE: additive metal placed in casting mold is heated and melted by means of electromagnetic field of HF current induced by inductor arranged in casting mold or in its lid. Plates of cathode slope portion are stepwise fixed from down to up on cathode bus in the form suitable for connection. Flux is applied onto welded surfaces of parts. Additive metal is cyclically fed to welding zone through metallic disc mounted in outlet opening of casting mold or through valve mounted inside outlet opening of casting mold or from intermediate vessel. Melting temperature of metallic disc is equal to that of additive metal or exceeds it.

EFFECT: high quality of electrical and mechanical welded joints formed in operating electrolysis vessel at condition of outer magnetic fields action without interrupting electric current load of current supply buses and without contamination of atmosphere with combustion products.

6 cl, 4 dwg, 1 ex

FIELD: the invention may be used for connection of metallic details primarily of aluminum elements of the current feeding bus of electrolyzers.

SUBSTANCE: the aluminum is heated in a melting pot to 1100-1400oC and delivered into a foundry form installed in the gap between the melting pot and the built-up surface of the metallic elements. The aluminum is fed through a slit channel with the square of the transversal section equal or larger then the tenth part of the square foundry form in the scheme. The channel is fulfilled in the bottom of the melting pot along the contour of conjugation of welded metallic elements. The height of the level of the melt of aluminum fed into the foundry form is chosen larger then the correlation of the total square of the built-up surface of the metallic elements in the foundry form to the inner perimeter of the foundry form in the scheme.

EFFECT: the mode provides reduction of losses of electric energy due to reducing electric resistance of welded connections at increasing their rigidity.

2 dwg, 1 tbl

FIELD: process engineering.

SUBSTANCE: invention can be used, for example in construction of main pipelines. Pipe end faces are butt-jointed and welded together by circular seam. Casting mould is arranged on said joint to heat it and casting mould for reinforcing coupling to be cast therein. Cast coupling cooled down, casting mould is removed. End faces of said cast coupling are welded by circular seams to surfaces of jointed pipes with their walls penetration within 0.2…0.5 δ, where δ is pipe wall thickness. Prior to arranging casing mould on joint surface, a spatial reinforcing metal carcass can be arranged thereon made from more refractory metal as compared with that cast in mould. To cast said coupling, metal molten in furnace or produced by exothermic mix combustion.

EFFECT: higher strength and reliability of pipes joint.

2 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. proposed method comprises patterns from foamed polystyrene and fitting or pasting 0.05-3.0 mm-thick plates, or rods, or needles subjected to surfacing. Finished patterns with inserts are assembled into pattern modules, coated with gas-tight anti-burning-in paint and dried. Prior to teeming the melt, pattern modules are arranged in flask, filled with loose moulding material, compacted by vibration, sealed and evacuated.

EFFECT: homogeneous alloyed layer.

4 cl, 1 dwg

FIELD: production of aluminum by electrolysis of melt cryolite salts in cells arranged crosswise in housing for electrolysis.

SUBSTANCE: busbars include cathode busbars in the form of built-up buses arranged along inlet and outlet sides of cell and having cathode slopes; buses arranged under bottom. Said built-up buses embrace ends of series of cathode buses. Each series passes 33 - 50 % of inlet current. Cathode busbars are connected with anode busbars of next cell by means of struts. Some built-up buses of inlet side, built-up buses of outlet side and assemblies of cathode buses are arranged in upper level, approximately at metal level in cell; some built-up buses of inlet side and buses arranged under bottom are placed at lower level. Buses of cathode busbars are placed maximally close to shell of ferromagnetic cathode casing of cell. Each of buses arranged under bottom is divided by 2 - 4 mutually parallel conductors placed in zone of terminal blooms of cell. Large number of parallel conductors are placed at side opposite relative to adjacent row of cells arranged by two rows. Struts are in the form of one bus or, preferably in the form of two mutually parallel buses connected with different built-up buses and they are electrically connected one with other through anode buses.

EFFECT: creation of optimal magnetic field in melt at using cathode casings with different screening properties, lowered operation cost.

5 cl, 1 dwg

FIELD: nonferrous metallurgy.

SUBSTANCE: the invention is dealt with nonferrous metallurgy, in particular, with devices and methods of correction of the magnetic fields at production of aluminum by an electrolysis from fused salts in an electrolyzer of a square form. The method provides for a passing of a correcting current through a bus-duct electrically not linked with the electrolyzer to independent sections of the bus-duct, which magnetic field interacts with an operating current of a vertical direction in the molten aluminum with origination of longitudinal force of compensation of the longitudinal skews of a boundary of an electrolyte - the molten aluminum, bus ducts caused by external magnetic fields of bus-ducts and adjacent electrolyzers. At the initial stage after start-up of the electrolyzer or an anodic effect quenching, a permanent electric current is fed onto all independent sections of the bus-duct; and in periods between anodic effects an alternating current is fed onto the middle independent section of the bus-duct, and in a mode of an approaching anodic effect they fed a pulsed alternating in-phase current with a frequency equal to the resonance frequency of standing waves at the border of an electrolyte - molten aluminum on all is fed onto all independent sections of the bus-duct. The device contains a bus-duct for gating through of the correcting current. The bus-duct is made in the form of a closed circuit formed by pipes made out of a nonmagnetic weak-conductive material and separated by bonding strips being in parallel to the short side of the bath for at least three independent sections and laid along the internal perimeter of the ferromagnetic body of the bath under a laying of refractory bricks. Inside the sections there are control windings with a possibility to be connected to independent power supplies a permanent, variable or pulsed alternating current. The invention allows to eliminate a longitudinal skew of the surface of the molten aluminum, caused by external magnetic fields of bus-ducts and adjacent electrolyzers, to quench the dangerous oscillations and to intensify process in the interpole space.

EFFECT: the invention allows to compensated a longitudinal skew of the molten aluminum surface, to quench the dangerous oscillations, to intensify process in the interpole space.

2 cl, 2 dwg

FIELD: non-ferrous metallurgy, possibly systems for sustaining operation modes of aluminum cells, mainly devices for connecting cathode bus with cathode rod of aluminum cell.

SUBSTANCE: current supply lead includes electric current supply unit in the form of set of flexible aluminum bands. One end of said set is rigidly connected with cathode bus; its other end is detachably connected with steel cathode rod through adapter whose contact surface is coated with copper layer. Current supply lead also includes additional adapter for connecting ends of set of flexible aluminum bands with cathode bus and with two metallic plates. Said adapter has П-shaped recess; ends of set of flexible aluminum bands are connected one to other, to lower planes of П-shaped recesses of adapters and to metallic plates by means of explosion welding. At side of cathode rod adapter and metallic plate are made of steel. At side of cathode bus adapter and metallic plate are made of aluminum. At side of cathode bus adapter and metallic plate are made of steel. Layer of aluminum is applied onto lower surface of adapter.

EFFECT: lowered electric current loss in place of contact of current supply lead and cathode rod, improved mechanical strength of connection.

4 cl, 2 dwg

FIELD: busbars for aluminum cells designed for producing aluminum at lengthwise two-row arrangement of cells in housing.

SUBSTANCE: inlet anode struts of busbars are arranged at near (along electric current direction) end of cell; outer struts are arranged along lengthwise sides of cell. Right outlet anode strut is spaced from cross axis of cell by distance consisting 0.05 - 0.12 of length of cell. Left outlet strut is spaced by distance equal to 0.08 - 0.16 of length of cell. Zone of arrangement of outlet struts provides lowered value of skewing of metal-electrolyte surface.

EFFECT: reduced circulation speed of melt metal.

2 cl, 1 dwg

FIELD: electrolytic production of aluminum, possibly structures of busbars of powerful aluminum cells with fired anodes arranged crosswise in housing.

SUBSTANCE: busbars include cathode rods connected with packs of cathode buses; anode struts connected through cross transmission buses with packs of cathode buses; anode buses provided with jumpers and connected with anodes struts. Busbars include at least five anode struts with next distribution of electric current loads for strut: central and boundary anode struts, 0.8 -1.0 mean electric current load for strut, remaining struts, 1.0 -1.25 mean electric current load for strut determined according to given expression. All cathode rods at each lengthwise side of cell are connected with one cathode pack having at least one cathode bus. Portions of packs of cathode buses, transmission buses and anode struts supplying current load to next cell have differentiated electric resistance providing predetermined electric current load.

EFFECT: lowered circulation speeds of metal and electrolyte, optimal electric current distribution by cathode and anode busbars, reduced electric current losses.

1 dwg

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