Paton Electric Welding Institute

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PRESSURE WELDING

Ref. No. 03.00/001

Technology and system for control of spot flash welding of interelement joints in storage batteries

1.1. KEYWORDS:
spot welding, technology for spot welding, interelement joints in storage batteries, computer-aided control system, quality of welded joints

1.2. BRIEF DESCRIPTION (abstract):
In new storage batteries the interelement joints in lead terminals are ade by spot flash welding. To asses the quality of a weld spot, elements are mechanically shifted relative to each other byapplying a certain force. If the weld spot fails, the storage battery is discarded.This method of ontrol is labour-consuming, requires the use of special equipment and is not always reliable enough. The E.O.Paton Electric Welding Institute developed a new technology for spot flash welding of interelement joints, which provides a high reproducibility of the quality of each spot. Its main point is in using welding with preheating, welding and annealing, as well as in applying the programmed compression force on electrodes. In addition, such process parameters as current and compression force are measured in real time and regulated by a feedback signal, which ensures stability of the welding process. Upon completion of the welding process the computerized control system of the RVK-100 type employed to control the welding machine displays on the screen the data on the weld spot quality. In the case of reject, the RVK-100 system gives a noise signal and stops welding by displaying the cause of reject.

2. PURPOSE AND FIELDS OF APPLICATION:
The technology is used for welding interelement joints in storage batteries at the Podolsk Machine-Building Plant (Russia).

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
The technology was developed, the RVK-100 system and the technology were validated in welding the interelement joints in storage batteries which are commercially manufactured.

4.PROPOSALS FOR COOPERATION:
Contract.

5.1. BASIC EXECUTORS AND DEVELOPERS:
Cand.Sci.(Eng.) Podola N.V.

Ref. No. 03.00/002

Technology and equipment for hermetic sealing of casings of devices by capacitor-discharge welding

1.1. KEYWORDS:
capacitor-discharge welding, technology for capacitor-discharge welding,hermetic sealing of casings of devices.

1.2. BRIEF DESCRIPTION (abstract):
The development is based on the principle of storing the energy in a capacitor bank and its subsequent transfer to the welding zone through a welding transformer. The theory and procedures developed for design of charging and discharging circuits of the capacitor-discharge welding machines made it possible to optimize the welding transformer and provided parametric stabilization of release of the energy within the welding zone. The technology and equipment offered for hermetic sealing of casings of devices by capacitor-discharge welding have the following advantages:

- special designs of the secondary welding circuit and the compression mechanism provide a uniform distribution of the welding current on the perimeter of the weld;

- consistency of the quality of welding is improved owing to the use of the combined "preheating-welding" cycle;

- parametric stabilization of release of the energy within the welding zone makes it possible to decrease the effect of scatter of resistance of pieces joined on the welding quality;

- the optimized welding transformer is characterized by a reduced mass, dimensions and cost;

- the machine features the high efficiency and reliability.

The use of the optimized capacitor-discharge welding machine provides hermetic welds in various devices, characterized by a high dynamic strength and operational reliability.

Specifications:

Power supply from three-phase mains: voltage, V ……………………… 380

……………………………… frequency, Hz …………………… 50

Perimeter of the hermetic weld, mm, not more than ……………………… 200

Maximum stored energy, kJ ……………………………………………… 52

Charging voltage of the capacitor bank, V ……………………… 100-400

Amplitude of the welding current pulse, kA ……………………… 50-200

Capacitance of the capacitor bank, thousands of microF ……………………650

Compression force, daN ………………………………………………… 30

Productivity, weld/h, not more than …………………………………… 360

Power consumption, kVA, not more than ………………………………… 12

2. PURPOSE AND FIELDS OF APPLICATION:
The technology and equipment are intended for hermetic sealing of casings of devices made from steels and non-ferrous metals by capacitor-discharge welding with a weld perimeter of up to 200 mm and a high quality of welded joints provided by improvement of mechanical properties and elimination of weld defects. The equipment can be applied at plants that use pieces which require hermetic sealing of their casings of round, square or rectangular shape, e.g., the manufacture of power semiconductor devices (diodes, thyristors), microcircuits, relays, etc.

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
The equipment is applied at plants manufacturing semiconductor devices in Tallinn (Estonia) amd Belaya Tserkov (Ukraine). Updating of design documents is required.

4.PROPOSALS FOR COOPERATION:
Any forms of cooperation.

5.1. BASIC EXECUTORS AND DEVELOPERS:
Dr.Sci.(Eng.) Pentegov I.V.

Cand.Sci.(Eng.) Stemkovsky E.P.

Cand.Sc.(Eng.) Sheikovsky D.A.

Ref. No. 03.00/003

Butt induction braze-welding

1.1. KEYWORDS:
butt induction braze-welding, solid-phase pressure welding

1.2. BRIEF DESCRIPTION (abstract):
The essence of braze-welding method consists in flux application onto the surface of the abutted edges of parts, induction heating of the weld zone up to the temperature of flux melting and subsequent controlled plastic deformation of the heated edges of the parts. The method incorporated the positive features of the technologies of brazing and pressure butt welding and its application provides butt joints equivalent in strength to the base metal, including pipes with an internal glass-enamel coating. The advantages of the method are no need for any special edge preparation of the items prior to welding, or for blanks rotation during welding; ability to apply highly effective induction heating during welding and heat-treatment of the weld (if required) and ultrasonic testing of welds; production of a smooth outer weld bead with a slight concavity and absence of any internal flash. Elimination of the operations of blank rotation and inner flash removal is important in manufacture of extended and bent pipelines and branchpipes. Physico-chemical and mechanical investigations of the weld and the heat-affected zone of the joints made by induction braze-welding, showed that their properties correspond to those of the base metal.

2. PURPOSE AND FIELDS OF APPLICATION:
The technology and equipment can be used in boiler construction, petrochemical engineering, in production of drill pipes of geological prospecting range, mounting of the production, processing and main pipelines, as well as when joining end connecting fittings (flanges, rings, nipples, unions, etc.) to them with 14 to 325 mm and greater outer diameter of the connectors and 1 to 12 mm wall thickness, and in fabrication of different tubular products in other industries. Pipe joints made by induction braze-welding, have successfully passed testing under the extreme conditions, in particular, in drilling of the geological prospecting wells for the Ministry of Geology of Ukraine. The process of braze-welding and the equipment for its application are becoming accepted now in the enterprises of the petroleum industry of the Russian Federation.

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
Technology and technical documentation for equipment for braze-welding of 57 to 114 and 114 to 325 mm diameter pipes in the shop have been developed. The equipment and technology have passed production trials in fabrication of semi-columns of drill pipes of geological prospecting range (50 mm diameter) and in manufacture of pipe sections of a production oil pipeline.

4. PROPOSALS FOR COOPERATION:
Any form of cooperation.

5.1. BASIC EXECUTORS AND DEVELOPERS:
A.S.Pis'mennii, Dr.of Sci. (Eng.)

M.E.Shinlov, Cand. of Sci. (Eng.)

Ref. No. 03.00/004

Tubular titanium-steel and niobium-steel adapters

1.1. KEYWORDS:
percussion welding in vacuum, adapters for welding, welding of titanium to steel, welding of niobium to steel.

1.2. BRIEF DESCRIPTION (abstract):
Tubular adapters with diameter of up to 40 mm are manufactured by percussion welding in vacuum with application of forming devices. Developed technology makes it possible to manufacture the adapters, operating over prolonged periods at the temperatures of 500-1100 C.

2. PURPOSE AND FIELD OF APPLICATION:
Ti-Steel and Nb-Steel adapters are designed for operation in the units of power plants and in corrosive medium.

3. STATE-OF-THE-ART AND LEVEL OF THE DEVELOPMENT:
Pilot-industrial testing and application at the enterprises of nuclear power, rocket and chemical engineering.

4. PROPOSALS FOR COOPERATION:
Different types of cooperation.

5.1. BASIC EXECUTORS AND DEVELOPERS:
Kharchenko G.K., Dr..of Techn. Sci.

Ignatenko A.I., Cand.of Techn. Sci.

Falchenko Yu.V., Cand.of Techn.Sci.

Ref. No. 03.00/005

High-performance hot cathodes for plasmatrons

1.1. KEYWORDS:
percussion welding in vacuum, hot cathodes for plasmatrons

1.2. BRIEF DESCRIPTION (abstract):
High-performance hot cathodes are manufactured by a percussion welding in vacuum by combination of the welding of active insert to copper yoke and forming of the product. Operation of welding and forming is performed per 10-3...10-2 s.

2. PURPOSE AND FIELDS OF APPLICATION:
Developed technology allows the hot cathodes of different shape to be manufactured for installation of plasma cutting, welding, surfacing and spraying installations. Prospects of this technology are determined by the following factors:

- combination of welding and forming of the product, eliminating the following treatment;
- 3...5 times increase of hot cathode efficiency.
3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
Pilot-industrial testing.

4. PROPOSALS FOR COOPERATION:
Different types of cooperation

5.1. BASIC EXECUTORS AND DEVELOPERS:
Kharchenko G.K., Dr. of Techn.Sci.

Ignatenko A.I., Cand.of Techn.Sci.

Falchenko Yu.V., Cand.of Techn.Sci.

Ref. No. 03.00/006

Round-link chains of high-strength titanium alloys

1.1. KEYWORDS:
percussion welding of titanium in vacuum, round-link welded chains, high-strength titanium alloys

1.2 BRIEF DESCRIPTION (abstract):
Round-link chains of titanium alloys are manufactured by percussion welding in vacuum in special devices. Welded chain of 8.5mm gauge provides 80000...85000 N rupture strength. The application of welded chains of high-strength titanium alloys makes it possible to decrease a weight of flying vehicles and increase the service life of chains. High corrosion resistance of titanium chains increases their service life by several orders of magnitude.

2. PURPOSE AND FIELDS OF APPLICATION:
Round-link chains, made of high-strength titanium alloys are used for fastening of cargo in flying vehicle cabins. Developed technology allows welded chains to be manufactured for aircraft engineering, shipbuilding and motor transport.

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
Pilot-industrial testing.

4. PROPOSALS FOR COOPERATION:
Different types of cooperation.

5.1. BASIC EXECUTORS AND DEVELOPERS:
Kharchenko G.K., Dr.of Techn.Sci.

Ignatenko A.I.,Cand.of Techn.Sci.

Faljchenko Yu.V., Cand.of Techn.Sci.

Ref. No. 03.00/007

Technology of fusion welding of dissimilar metals with limited mutual solubility

1.1. KEYWORDS:
pressure welding, welding temperature, welding pressure, welding under vacuum, welding of dissimilar metals, intermetallics, barrier interlayers

1.2. BRIEF DESCRIPTION (abstract):
Welding is carried out under vacuum. The process parameters, namely pressure, temperature, time, are selected depending on the metal-chemical properties of the metals being welded. The welding temperature should be lower than the temperature of the intermetallics formation in the zone of contact of the metals being joined, whereas the pressure should be above the yield point at the welding temperature. Appropriate welding equipment and welding fixtures were developed. The technology provides the absence of brittle phases in the welded joint zone and its strength equivalent to that of the less strong of the metals being joined.

2. PURPOSE AND FIELDS OF APPLICATION:
The technology is designed for welding metals with a limited mutual solubility and allows fabricaton of the transition pieces of a cylindrical (solid or tubular) cross-section. It is used in the productiob of transition pieces of the following metal pairs: Ti+Al, Ti+Cu, ziralloy+steel, Ti+W, etc.

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
Currently used in industry

4.PROPOSALS FOR COOPERATION:
Various forms of co-operation beneficial for both sides.

5.1. BASIC EXECUTORS AND DEVELOPERS:
V.N.Zamkov, Dr. of Sci.(Eng.)

L.S.Kireev, Dr. of Sci.(Eng.)

V.K. Sabokar', Cand. of Sci.(Eng.)

Ref. No. 03.00/008

Capacitor-type underwater stud welding

1.1. KEYWORDS:
capacitor-type welding, underwater welding, stud welding.

1.2. BRIEF DESCRIPTION (abstract):
Technology of underwater capacitor-type stud welding for different structures by using "wet" method has been developed. Machine of the K-747MV type, equipped with a welding gun and a head is used for welding. The investigations showed a feasibility of realization of the capacitor-type underwater stud welding at the depths of up to 40 m.

2. PURPOSE AND FIELDS OF APPLICATION:
The technology and equipment are designed for welding up steel studs of up to 8 mm diameter to the structures and constructions operating underwater at the depth of up to 40 m.

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
Research and Experimental-Design Developments (REDD) were made (there are results of investigations).

4.PROPOSALS FOR COOPERATION:
Joint project, open feasibility of cooperation.

5.1. BASIC EXECUTORS AND DEVELOPERS:
Dr. D.M.Kaleko

Ref. No. 03.00/009

Technology of flash butt welding of thin metal strips

1.1. KEYWORDS:
flash butt welding, high-frequency voltage, thin metal strips, belt saws

1.2. BRIEF DESCRIPTION (abstract):
Technology of the flash butt welding of thin metal strips (0.2-1.0 mm thick), which are used for manufacture of continuous belt saws from high-strength steels for sawing board, wood, rubber, marble, section rolled metal, etc., has been developed. The new technology is characterized by using a converter which provides an output voltage of high frequency (330 Hz) and rectangular shape, low pressure in upsetting and welding conditions, determined by criteria of a physical similarity. On the basis of comprehensive investigations of welded joints the technology of their heat treatment was developed.

2. PURPOSE AND FIELDS OF APPLICATION:
Technology is designed for welding different-purpose metal strips of 1 mm thickness and less.

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
Laboratory equipment has been developed.

4. PROPOSALS FOR COOPERATION:
Manufacture of industrial prototype of welding installation.

5.1. BASIC EXECUTORS AND DEVELOPERS:
Dr.Dubko A.G.

Ref. No. 03.00/010

Welding of multicore with single-core wires

1.1. KEYWORDS:
percussion capacitor-type welding, butt welded joints, welding of non-ferrous metals, welding of dissimilar metals, multicore wires

1.2. BRIEF DESCRIPTION (abstract):
Joining of multicore wires with single-core wires is performed in two stages. At the first stage the arc discharge of the capacitors fuses an edge of the multicore wire, thus creating a monolithic joint; at the second stage a single-core wire is fused to an edge of the multicore wire by the the method of arc capacitor-type welding. The welded range of sections of the multicore wires is 0.25-1.5 mm. Diameters of single-core wires are higher than 0.3 mm. The metal being welded: copper and its alloys, aluminium and its alloys in different combinations. Efficiency is up to 30 welds/min in the automatic conditions. The advantage of the processes is a low consumed power (up to 1.5 kW at the 15welds/min efiiciency). The auxiliary materials (forming tubes, shielding gas) are not used.

2. PURPOSE AND FIELDS OF APPLICATION:
Main fields of application: manufacture of electric plugs and termination of aluminium wires with copper flexible tips.

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
There are results of investigations and samples of experimental and industrial testing.

4.PROPOSALS FOR COOPERATION: Any form of cooperation.
5.1. BASIC EXECUTORS AND DEVELOPERS:
Dr. D.M.Kaleko

Ref. No. 03.00/011

Percussion capacitor-type welding of wires between themselves and to components of developed configuration

1.1. KEYWORDS:
percussion capacitor-type welding, welding of wires, welding of dissimilar materials

1.2. BRIEF DESCRIPTION (abstract):
The percussion capacitor-type welding is a variety of the resistance butt welding using an impact mechanical load applied during and after the arc discharge, which fuses the abutted surfaces of the metallic billets. Energy for the arc discharge is preliminary accumulated in the capacitors. Materials to be welded: most of well-known industrial metals and alloys in similar and dissimilar combinations. The hardness of metal of the wire welded should be within 1.5-20 MPa. Types of welded joints: butt welding of similar and different diameters (the large diameter is not limited); T-joint welding of wires to flat, cylindrical or spherical surfaces; welding of multicore wires to the surfaces of different shape. The time of welding is less than 1 ms. The efficiency is up to 60 welds/min in the automatic conditions. Except advantages, defined by the accumulation of energy in the bank of capacitors, namely a low consumption of energy, high accuracy of its proportioning in welding, a narrow HAZ, the percussion capacitor-type welding is characterized by an independence of the welded joint quality of the surface state and absence of metallurgical limitations in welding dissimilar metals.

2. PURPOSE AND FIELDS OF APPLICATION:
The method of the percussion capacitor-type welding is used for butt welding of electrodes of radio- and lighting lamps, welding of taps in electronic devices and radio equipment, connection of thermocouples and contacts in relay, etc.

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
There are results of investigations and a large experience of the industrial implementation.

4. PROPOSALS FOR COOPERATION:
Any form of cooperation.

5.1. BASIC EXECUTORS AND DEVELOPERS:
Dr. D.M.Kaleko

Ref. No. 03.00/012

Technology and equipment for welding a side electrode to casing of the spark-plug and for sealing an insulator with the spark-plug casing

1.1. KEYWORDS:
flash butt welding, spark-plug, sealing of the spark-plug, sealing of the spark-plug insulator

1.2. BRIEF DESCRIPTION (abstract):
Equipment and technology were developed for welding a side electrode to the spark-plug casing. The side electrode is made from wire of nickel alloy of the Mts5 grade. Welding is performed in the automatic mode using a flash butt welding machine equipped with a turntable designed for 6 positions. Upon installing the spool with wire and turning on of the automatic device, the wire is fed to a welding device, wherein it is cut to a required length (10 mm) and welded to the spark-plug casing. The piece welded is unloaded also in the automatic mode. Sealing the insulator to the spark-plug casing is done using the other flash butt welding machine. As compared with the existing technologies, the technology and equipment developed are much simpler, more reliable (a.c. flash butt welding machine is used instead of capacitor-discharge one) and ensure high productivity and high quality of the spark-plugs.

2. PURPOSE AND FIELDS OF APPLICATION:
Technology and equipment are intended for the manufacture of car spark-plugs.

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
Technology and equipment for the manufacture of spark-plugs were developed, experimental-industrial validation was done, prototypes of the equipment were manufactured.

4. PROPOSALS FOR COOPERATION:
Making a contract.

5.1. BASIC EXECUTORS AND DEVELOPERS:
Cand.Sci.(Eng.) Podola N.V.

Ref. No. 03.00/013

Technology and equipment for flash butt relief welding of stacks of stators for automotive electric motors and generators

1.1. KEYWORDS:
flash butt relief welding, relief welding technology, stack of stators of automotive generators, press for relief welding.

1.2. BRIEF DESCRIPTION (abstract):
Many types of low-power generators and electric motors have stators the plates of which are assembled into a stack using rivets or TIG welded. The E.O.Paton Electric Welding Institute developed the technology and equipment for flash butt relief welding of stator stacks, which incurred no costs for materials for riveting or arc welding. According to the technology developed, the extra protrusions (relieves) are made on stator plates by forming, which then serve, when the stack is assembled, for fixation of the plates relative to each other and subsequent welding. As shown by experience, this provides more precise orientation of the plates relative to each other, thus reducing the probability of damage of windings in slots and improving electrical characteristics of the generator. The machine consists of a relief press and a turntable. It operates in the automatic mode, except for loading the stator into the welding device, and its productivity is 300-450 welded stators per hour. As proved by experience, one machine provides welding of more than a million of stators and rotors per year. This requires no consumables and improves the quality of stators at high productivity.

2. PURPOSE AND FIELDS OF APPLICATION:
Technology and equipment for relief welding are intended for joining plates of stators of low-power generators or electric motors. Subject to appropriate optimization, they can be applied for other types of mass produced pieces.

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
Technology and semi-automatic machine based on a relief press and turntable for six positions were developed and are successfully applied at the Altaj Factory of Tractor Electric Equipment.

4. PROPOSALS FOR COOPERATION:
Making a contract.

5.1. BASIC EXECUTORS AND DEVELOPERS:
Cand.Sci. (Eng.) Podola N.V.

Ref. No. 03.00/0014

Explosion treatment of welded joints of metal structures

1.1. KEYWORDS:
explosion treatment, stressed-strained state, strength, service properties

1.2. BRIEF DESCRIPTION (abstract):
Firing on the surface being treated, miniature put-on charges of explosives, whose weight and confugration are selected depending on the purposes and conditions of the task being solved, provides a complete removal or favourable redistribution of the residual welding stresses, creation of pre-set fields of residual compressive stresses in the necessary locations, strengthening of the surface layer of metal, refinement of the structure, homogenizing of the inclusions, impact on the metal texture. This provides a marked improvement of the corrosion cracking resistance, fatigue strength, cyclic fatigue life, brittle fracture resistance, wear-resistance, dimensional stability, etc. The main advantages compared to the existing methods of solving similar tasks (heat-treatment, forging, ultrasonic processing, pre-tension, etc.) are versatility, high speed, mobility, no need to use special equipment, power, highly-qualified personnel, higher efficiency (by 10 to 100 times), reduction by an order of value of the cost of post-weld treatment. In some practical cases, the technology provides unique results, inachievable with other methods.

2. PURPOSE AND FIELDS OF APPLICATION:
Rational fields of application are treatment of large-sized welded structures (tanks, pipelines, bridge frameworks, tank cars, etc.). The technology was tried out in the Nikolaev Alumina Plant, Tashlyk HPP, Zaporozhje Aluminium Works, "Birach" plant in Yugoslavia.

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
Large-sized production application, act of inter-industry commission

4.PROPOSALS FOR COOPERATION:
Any forms of cooperation

5.1. BASIC EXECUTORS AND DEVELOPERS:
V.G.Petushkov, Dr. of Sci. (Eng.)

Yu.I. Fadeenko, Cand. of Sci. (Phys-Math)

eng. A.G.Bryzgalin

Ref. No. 03.00/015

Explosion welding of items from difficult-to-weld combinations of metals

1.1. KEYWORDS:
explosion welding, bimetal, cladding, multi-layer materials, difficult-to-weld metals

1.2. BRIEF DESCRIPTION (abstract):
Technology was developed of explosion welding of difficult-to-weld metals (aluminium to copper, titanium to steel). The problem of explosion welding of such combinatios of metals has not been studied well enough. In particular, the modes of welding copper to aluminium are anomalous in terms of the current concepts of explosion welding. It is difficult to produce welded joints of a uniform quality on a limited area of the item being clad without formation of lacks-of-penetration on the edges. The experiental studies and technological developments conducted in the E.O.Paton Electric Welding Institute allowed to successfully solve the prolem of explosion welding of aluminium to copper when developing the specific technologies of manufacture of items for high-current electrical engineering. Technology has been developed for mass production of copper-aluminium transition pieces - current supplies on the shop floor in an explosion chamber.

2. PURPOSE AND FIELDS OF APPLICATION:
The technology can be used not only in the fabrication of items for high-current electrical engineering (electric furnaces, electrodes of eletrolyzers), but also in other cases, when it is necessary to perform cladding on a limited area or manufacture itmes from difficult-to-weld combinations of metals of the type of copper+aluminium, etc.

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
Production application under contracts with foreign customers.

4.PROPOSALS FOR COOPERATION:
Making contracts, sale of a license, joint project.

5.1. BASIC EXECUTORS AND DEVELOPERS:
L.D.Dobrushin, Cand. of Sci. (Eng.)

Ref. No. 03.00/016

Technology of welding of aluminium and its alloys with steels and copper and also composite materials on the base of aluminium with fibrous and dispersion strengthening

1.1. KEYWORDS:
welding aluminium with steel, welding aluminium with copper, welding of composite materials on the base of aluminium, welding of dissimilar metals, welded structures of aluminium and its alloys

1.2. BRIEF DESCRIPTION (abstract):
At the E.O.Paton Electric Welding Institute the technologies of welding aluminium and its alloys with steels and copper and also composite aluminium-based materials with fibrous and dispersion strengthening have been developed. Technologies make it possible to perform welding of steel-aluminium structures of up to 80 mm thickness and copper-aluminium structures up to 10-12 mm thickness providing strength at the level of the aluminium alloy. Both types of joints can operate in vacuum and at cryogenic temperatures (up to 77 K). Technology of welding thin-sheet composite materials (2.0-2.5 mm) on the base of aluminium strengthened with fibres of steel, silicon carbide, carbon (including carbon strip) between themselves and with homogeneous metals (aluminium alloys, titanium) providing strength of the joint at the level of 70 % of the composite material strength has been developed. The application of composite materials promotes creation of new aircraft structures, aerospace systems, improvement of thermal-physical parameters of power units, increase in reliability of units and service life of products, decrease in their material content. The great advantage of the developed technologies is a feasibility of using industrial serial-produced welding equipment.

2. PURPOSE AND FIELDS OF APPLICATION:
The developed technologies can be used in ship-building, aerospace industry, automobile industry in manufacture of household appliances, etc. In particular, they are used for welding aluminium deck substructures to steel hull of the ship, steel-aluminium panel systems of cooling holds of refrigerators, steel-aluminium pipings for nuclear reactors, aluminium busbars with copper busbars, composites in flat and tubular variants (stiffeners, girders, supports).

3. STATE-OF-THE-ART AND LEVEL OF DEVELOPMENT:
Technologies have passed the industrial trials.

4. PROPOSALS FOR COOPERATION:
Developed technologies and know-how can be transferred to interested companies on the contract base.

5.1. BASIC EXECUTORS AND DEVELOPERS:
Prof. Ryabov V.R.

First call for papers

International Conference
WELDING AND RELATED TECHNOLOGIES INTO THE THIRD MILLENNIUM

24–26 November, 2008
Kyiv, Ukraine

The International Conference «Welding and Related Technologies into the Third Millennium» will be held by the E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine on 24–26 November, 2008 in Kyiv. The invited papers of scientists from different countries of the world about the most important research achievements, obtained during recent years in the field of welding, surfacing, brazing, strength, NDT and technical diagnostics, assessment of residual life of welded structures and surface engineering, special electrometallurgy, and also about the prospects of progress of these trends will be presented and discussed at the plenary sessions of the Conference. Alongside with plenary sessions the poster papers will be also presented.

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