Soldering, e.g. brazing, or unsoldering (B23K1)

ultilayer aluminium sheet for flux-free high temperature brazing in controlled atmosphere // 2642245
FIELD: metallurgy.SUBSTANCE: multi-layer sheet for flux-free high temperature brazing comprises an aluminium alloy core coated with intermediate layer of aluminium alloy, and solder of aluminium alloy applied on the intermediate layer. The core is made of 3XXX aluminium alloy containing, wt %: Mn<2.0, Cu≤1.2, Fe≤1.0, Si≤1.0, Ti≤0.2, Mg≤2.5, Zr, Cr, V and/or Sc in total ≤0.2, the rest is Al and unavoidable impurities. The intermediate layer is made of aluminium alloy containing, wt %: Mg 0.2-2.5, Mn <2.0, Cu≤1.2, Fe≤1.0, Si≤1.0, Ti≤0.2, Zn≤6, Sn≤0.1, In≤0.1, Zr, Cr, V and/or Sc in total ≤0.2, the rest is Al and unavoidable impurities. The solder is made of an aluminium alloy containing, wt %: Si 5-14, Mg<0.02, Bi 0.05-0.2, Fe≤0.8, Zn≤6, Sn≤0.1, In≤0.1, Cu≤0.3, Mn≤0.15, Sr≤0.05, the rest is Al and unavoidable impurities. The core material and the intermediate layer have higher melting point than the solder, and the intermediate layer is protective relative to the core. The total thickness of the cladding layer consisting of the intermediate layer and solder layer with respect to total sheet thickness is 3-30%. Soldering can be carried out in inert or reducing atmosphere without necessity of for applying the flux.EFFECT: possibility for soldering complex designs with corrosion potential.16 cl, 2 tbl

ethod for obtaining permanent joint of components made of dissimilar materials, one of which is made of plastic metal // 2642239
FIELD: technological processes.SUBSTANCE: threaded holes (2) are made in the first component (1). On the component (3) made of plastic metal, recesses (4) for heads of fastening elements (5), coaxial to the holes (2), are made. The components (1) and (3) are fastened by the fastening elements (5), wherein the heads of the fastening elements (5) are embedded into the recesses (4) until formation of free space between the heads and the component (3) surface. The component (3) made of plastic material is affected by a rotating cylindrical tool (6) to heat it to the temperature causing its plasticization. When moving the tool, the mentioned free space of the recesses is filled with plasticized metal (7) of the second component (3), ensuring closure of the heads of the fastening elements (5) in them, receiving hermetic permanent joint. During the heating of the second component, when the cylindrical rotating tool (6) is moving, the first component is cooled.EFFECT: method provides high structural strength of the permanent joint of dissimilar materials.2 cl, 5 dwg
ethod of powered semiconductor devices welding // 2641601
FIELD: electricity.SUBSTANCE: in the hole of multiple cassette a supporting glass bushing is previously inserted and connectable assembly components of semiconductor device made in the form of semiconductor crystals, heat sinks and outputs, are uploaded. Place soldered gaskets are placed between them and the resulting assembly is welded in a furnace with a reducing or inert medium by heating to a temperature above the melting point of the solder. The internal diameter of the glass bushing corresponds to the dimensions of loaded parts of semiconductor device assembly.EFFECT: method allows to increase the degree of alignment of the elements of semiconductor devices assemblies and to prevent mechanical damage to assembly crystals when they are unloaded from the cassette after welding.5 dwg, 1 tbl
ethod of contact butt welding of rails // 2641586
FIELD: transportation.SUBSTANCE: after preliminary machining, heating the rail ends to be welded and settling are carried out. After settling, an exposure of 5÷15 seconds is carried out, then alternating electric current 2÷4 is passed through the welded joint in pulses with the duration of 0.5÷220 seconds at the intervals of 10÷40 seconds at the current density of 2÷40 A/mm2.EFFECT: required microstructure and mechanical properties of the welded joint without additional heat treatment, excluding the defects in the weld seam and the weld zone, reducing the duration of the rail joining process.1 tbl
ethod of strengthening blade surface of part // 2640515
FIELD: technological processes.SUBSTANCE: first sintered tungsten-cobalt alloy and then the reinforcing charge are applied by electro spark alloying to the rear part of the blade. The charge is heated with high-frequency currents, and the hardened reinforcing layer is deformed in the forming die while simultaneous drawing off the blade. As a reinforcing charge, a charge is used containing, wt %: boron carbide 72-82, silicocalcium 5-9, flux P-0.66 - the rest. It is applied with a layer of 0.8-2.5 mm. When the reinforcing layer is deformed, it is pressed into the blade surface to a depth equal to its thickness, after which the part is held at a temperature of 450-600°C, for 2 to 5 hours, and then cooled in air.EFFECT: increasing the wear resistance of the blade surface of the part along the wear contour.2 dwg, 1 tbl

Industrial equipment working on principle "roll-to-roll" for implementation of mutually agreed continuous and discontinuous stages of treatment // 2640502
FIELD: technological processes.SUBSTANCE: first drive unit is designed to move the strip base in the feeding direction (X). The strip base moves through at least two treatment zones (110, 120, 130) in such a way that different areas of the strip base can be processed simultaneously. At least two treatment zones include the first treatment zone (110, 120) for the discontinuous process and the second treatment zone for the continuous process using a solder reflow processing plant. The soldering plant (130) contains at least one heat source (W) and the second drive unit to move this heat source relative to the first treatment zone along the strip base. The second drive unit is made with the possibility of moving the heat source (W) relative to the first treatment zone (110, 120) along the strip base (101) in the direction opposite to the feed (X) of the strip material (101), even if the first drive unit remains stationary.EFFECT: process improvement.15 cl, 5 dwg
ethod of restoration of part of aluminium or copper alloy // 2639440
FIELD: metallurgy.SUBSTANCE: on the surface to be restored, a steel reinforcing fabric mesh is placed, the part is driven into rotation with simultaneous transmission of welding current pulses, which is sufficient for heating of its surface by electrical contact method to ductile state of alloy. The steel woven mesh is pressed flush against the surface of the part to be restored by constantly moving the roller electrode along the axis of the part. A woven mesh is used whose cell size does not exceed the width of the roller electrode and ensures the extrusion of part material heated to the plastic state through the cells. The diameter of the mesh wire is selected depending on the required value of the increment of the size of the part to be restored in the process of reinforcement.EFFECT: increased life of restored parts.2 tbl

Device for cooling electrode-cap of contact point welding (cpw) // 2639168
FIELD: electricity.SUBSTANCE: electrode-cap with a conical and cylindrical surface of its cavity is mounted on the front conical surface of the hollow cooled holder. In the wall of holder transverse windows connected to its cavity are made. Axial cavity of holder consists of the main cavity, performed at his back, and extra cavity in front of the holder in which the tube with lateral clearance for refrigerant inlet is installed, fixed by rear end into the main cavity holder. The tube is made from expanding to its end bell mouth and posted to exude of said bell mouth to front end of holder with the formation of axial and circumferential clearances between the surface of bell mouth and cylindrical surface of electrode-cap cavity. One of the transverse windows of the holder is opened to said side clearance in the additional cavity of holder, and the other - to the main cavity of holder.EFFECT: device has a simple design with a reduced length of the holder and sleeve, and provides high reliability and durability of the electrode.4 cl, 3 dwg

Gun for contact point welding // 2638472
FIELD: electricity.SUBSTANCE: at the gun body 7, an electrode holder 8 is provided, connected to an electric wire 9, and a switch 11 having a welding current on/off button 10 with a simultaneous inert gas injection into the welding zone. Inert gas inflation system is installed on the electrode 4 and is designed in the form of attachment, consisting of washers with holes 1 and a case 2 with the channel connected with a hose of the inert gas supply. The electric holder is connected to the electric wire by soldering. The electrode 4 is installed in the electric holder 8 by conical fit and clamped by a ring 6.EFFECT: gun for contact point welding has high performance characteristics with small dimensions.3 dwg
ethod for producing super-ductile clad material based on aluminium // 2637842
FIELD: metallurgy.SUBSTANCE: chemical treatment is carried out in succession with 40% NaOH solution in water, 5% HNO3 solution in water and tetrachloromethane of contact surfaces of high-strength plate 13-13.5 mm thick consisting of an alloy on the basis of aluminium containing, wt %: 3.5-4.5 zinc, 3.5-4.5 magnesium, 0.6-1.0 copper, 2.0-3.0 nickel, 0.25-0.3 zirconium, and cladding sheets with thickness of 1-1.1 mm of aluminium alloy. Cladding sheets are placed on surfaces of the high-strength plate and the high-strength plate is welded with the cladding sheets by hot rolling at temperature of 400-460°C with the cobbing of at least 50% for the first pass and total cobbing of 70-80% followed by cold rolling for 70-80% to obtain clad material with thickness of 1 mm.EFFECT: production of corrosion resistant parts with elongation of more than 300 percent at high temperature deformation by superplastic forming method, the obtained parts have a long service life which allows to extend the field of their application.4 ex

Powder thermo-reactive charge for induction welding of solid alloy // 2637736
FIELD: chemistry.SUBSTANCE: charge contains, wt %: flux based on boron-containing components 8-10, a composition consisting of a boron compound and providing in the process of welding the passage of self-propagating high-temperature synthesis (SHS) 13-17, carbide - the rest. The components of the charge have the granule size of <0.5 mm, and the flux based on the boron-containing components is used in a fused form. Before using the charge, 1-2% alcohol rosin solution is added to its powder to obtain a gruel-like mass and mixed thoroughly.EFFECT: increasing the wear resistance of carbide coating by preventing the formation of a pre-eutectic structure in it.4 dwg, 1 tbl

Plasma torch // 2637548
FIELD: machine building.SUBSTANCE: walls of the hollow housing of the plasma torch are insulated with a heat-resistant material on the inner side. The plasma torch also comprises a plasma-forming nozzle, a cathode with a cathode-holder and a device for supplying a plasma-forming gas. Heat pipes are used to cool the heat-loaded elements. The end of one heat pipe is installed inside the cathode and connected to the cathode. Another heat pipe is located in the housing, and its end is connected to the plasma-forming nozzle. The second ends of the mentioned heat pipes are led out of the housing and connected to radiators which are placed in a tank with a cooling liquid. Clearances between the heat-loaded elements and the heat pipes are filled with heat-conducting heat-resistant paste. Cooling with the help of the heat pipes simplifies the design of the plasma torch and reduces its dimensions, while simultaneously providing a high degree and speed of heat removal from the heat-loaded elements.EFFECT: intensive heat removal increases the operational life, power and reliability of the plasma torch.1 dwg

Combination electrodes for contact butt welding of round section products with further flash removal // 2637042
FIELD: electricity.SUBSTANCE: combination electrodes are made in the form of two lower energizing jaws and two upper clamps equipped with four cutting half-bushings with the possibility of coverage of welded blanks. The front cutting edge of each of the two lower half-bushings is made elongated in comparison with the edge of the upper half-bushing with the possibility of flash removal from the bottom of the welded product above its horizontal axis. The cutting edges of the upper and lower half-bushings are crossed to ensure complete removal of the flash from the product. Each of the two lower half-bushings is performed with a groove located behind the cutting edge to ensure a tight pressing of the welded blanks to the energizing jaws due to elastic deformation of the lower half-bushings by clamping force of the electrodes.EFFECT: improved cleaning quality of round product surface and improved stability of product contact on the lower energizing jaws by applying the half-bushings to the specified structure.1 dwg

ethod of hybrid arc augmented laser welding of pipe longitudinal seam // 2637035
FIELD: electricity.SUBSTANCE: at the same time, two laser beams are used for welding. The laser beams are located on the side of the outer surface of the edge butt of the pipe billet. The filler wire, melted with electric arc, is fed into the welding zone in a protective gas with the formation of a single weld pool. The electric arc is placed behind the beams to fill the groove of the pipe billet. The axes of the beams are placed in one plane perpendicular to the welding direction and at equal angles from the vertical axis, intersecting them in the focus region. The focus is located above the surface of the workpiece and the regions of defocusing are located to let the beam hit the opposite edge of the butt.EFFECT: improving the quality of the welded joint when welding the edge butt of the billet with both the maximum permissible gap and excessive gap.2 cl, 3 dwg

Device for determining temperature gradient in profile welding area during butt resistance welding // 2636782
FIELD: metallurgy.SUBSTANCE: device is intended for placement of forming knife of a jig plate in a channel and contains thermocouples and a pressure screw for pressing joints of thermocouples to part surface. The outer surface of a bushing made of electrically insulating material is identical to the shape of the channel of the jig plate forming knife, and the inner surface has vertical grooves. The metal bushing is spring-loaded relative to the pressure screw and the bushing made of electrically insulating material, and provided with a central opening and is mounted concentrically with the bushing made of electrically insulating material for reciprocating movement. Its projections are arranged in the vertical grooves of the bushing made of electrically insulating material. The pressure screw is provided with a longitudinal channel for receiving thermocouples therein. The thermocouples are connected to control means of the welding process. The joints thermocouples are arranged in one plane and fixed by epoxy resin in said central hole of the bushing.EFFECT: invention provides high accuracy of observance of optimal heating parameters and improvement of weld quality.4 dwg

ethod of unit connection "pipe - tube grill" with welded friction // 2636779
FIELD: machine engineering.SUBSTANCE: invention can be used for the production of friction welding pipe-tube connection, for example, in the manufacture of heat exchangers. On the welded ends of the pipe and pipe grid, a washer is installed, the inner diameter of which is equal to the pipe cross-section, its outer surface has a conical and cylindrical parts, and the pipe edges and tube-hole holes have internal tapered surfaces with a bevel angle corresponding to the bevel angle of the conical surface of the washer. Rotate the washer with the pressing force and the subsequent forging force after stopping its rotation. A peculiarity of the method of joining the pipe-tube assembly is the cavity of the specified dimensions obtained by additional boring of the hole in the tube grid. Such cavity provides in the process of welding by friction extrusion of the heated metal (grate) and removal of surface contaminants in it both from the outer surface of the pipe and from the frictionless conical surfaces of the tube grid and washer.EFFECT: due to the prevention of contamination in the weld seam, the quality is improved.3 dwg

anufacture method of composite rolls and composite roll // 2636648
FIELD: technological processes.SUBSTANCE: method involves applying coating (3) on the main body (2) by hot isostatic pressing of powder material. After the hot isostatic pressing of the main body (2) of the composite roll (1) the necks (4) are welded to the main body (2).EFFECT: higher wear resistance of rolls, flexibility of rolls.16 cl, 3 dwg
Technique of discrete semiconductor crystals brazing to case // 2636034
FIELD: electricity.SUBSTANCE: technique of discrete semiconductor crystals brazing to case comprises the preliminary tinning of the lower crystal metallized surface and the case in the molten solder, the crystal moving, its pressing to the polished mirrored unmetallized surface and soaking under cooling, the crystal lifting and moving to the supposed position of joint, the crystal pressing to the bottom and its bedding-in. The brazing is carried out in the shielding atmosphere.EFFECT: improvement of a technological process of the crystal and case joining, improvement of the solder acceptance of the brazed crystal surfaces and case, obtaining the qualitative void-free brazed joint without oxide inclusions, heat removing improvement and crystal output dissipation power ascension.1 cl
Flux for soldering aluminium and thereof alloys // 2635674
FIELD: metallurgy.SUBSTANCE: flux for soldering aluminium and thereof alloys contains the following components, wt %: lithium chloride 20-30, sodium chloride 10-12, potassium chloride 30-45, zinc chloride 3-15, potassium fluoride 2-5, fluoride lithium 2-5 and at least one component from the group containing cesium fluoroaluminate, cesium fluoride, with a total content of 1-10. The ratio of lithium chloride to potassium chloride is 2:3, the ratio of the content of lithium fluoride and potassium fluoride is 1:1, and the total content of fluorides does not exceed 15 wt %. Soldered structures obtained with the use of flux have a strength of not less than 300 MPa, high corrosion resistance.EFFECT: increase the service life of products.2 tbl, 1 ex

Device for contact point welding with cooling electrode-cap // 2635640
FIELD: electricity.SUBSTANCE: in the axial cavity of the holder, a tube for supplying a coolant is placed with a lateral clearance, the rear end of which is connected to a cap on the rear of the holder and fixed in a movable bushing. The electrode-cap has a cavity with conical lateral surface and placed on the front part of the conical surface of the holder with the formation of the gap between its face and the bottom of the electrode-cap cavity. The front part of the holder is made chamfered, and the pipe for supplying a coolant is made with recesses on its front end and installed with an emphasis in the bottom of the electrode-cap cavity. The said movable bushing has a sealing element disposed in an outer lateral groove and is installed in a cavity formed in the region of the front end of the cap. Between the rear end of the bushing and the bottom of the said cap cavity, an elastic element is arranged to deform it when the bushing is moved. A longitudinal window is made from the rear end of the cap, and in the holder, there is a transverse window for the coolant.EFFECT: holderensures the resistance of the electrode, which increases the reliability of the welding device.6 cl, 1 dwg

Electrode holder of welding tongs for contact point welding (cpw) // 2635639
FIELD: electricity.SUBSTANCE: electrode holder of welding tongs contains two angled rods with channels for the circulation of the refrigerant, at the end of the first of which a shank fixing the elements of the tongs is mounted, and at the end of the second one a cross is done fixing the electrode shank. The lower longitudinal channel for the circulation of the refrigerant consists of the main and additional blind channels connected among themselves by transverse inclined channels intersecting with their bottoms. The additional lower longitudinal channel is connected to the upper longitudinal channel by a transverse channel formed between the receptacle for fixing the electrode shank and the front end of the rod. The upper longitudinal channel is aligned with the transverse channel in the electrode shank. The additional lower longitudinal channel is open to the lower part of the said socket, and the main lower longitudinal channel is configured to remove the refrigerant beyond the rod.EFFECT: efficiency of cooling the electrode and increasing the reliability of welding.1 dwg

ethod of electron-beam welding of parts // 2635637
FIELD: electricity.SUBSTANCE: invention can be used for butt joints of titanium alloys with through penetration with width of up to 15 mm. The method includes cutting the welded edges of the welding parts with the execution of an additional projection with a reference point on one of the parts from its outer side, installing the parts butt-to-butt on the welded edges, aiming the electron beam on the mentioned reference point with the location of its axis in the joint plane of the parts and simultaneously melting the additional projection and the welded edges of parts with the electron beam. The welded edges are made at right angle to the outer surface of the parts. The additional projection is made with a cross-section in the form of a rectangle with the location of its center in the plane of the welded edge of the part, wherein the reference point is made in the form of a graduation mark located in the plane of the welded edge of the part and transverse slits with depth to the plane of the welded edge of the part are made on the projection.EFFECT: reducing the labour intensity of processing parts for welding and improving the quality of welded seams.4 dwg

ethod of electron-beam welding glass tube parts // 2635592
FIELD: electricity.SUBSTANCE: parts are placed in a vacuum chamber, pressures of 5÷20 Pa are created in it and a weld is formed at the joint of the parts by a focused electron beam from the source of the focused beam. Before welding and during welding, the tube regions adjacent to the junction are heated by two counter defocused electron beams while rotating the welded parts around the axis of symmetry. The focused electron beam is oriented perpendicular to the directions of the defocused beams.EFFECT: use of two counter defocused electron beams with simultaneous rotation of the welded parts and a perpendicular orientation of the focused electron beam ensures an improvement in the quality of the welded joint due to the symmetry of the irradiation and, as a result, simultaneous heating of the pipe sections adjacent to the weld, which in turn reduces the temperature gradients and eliminates the cracking of pipes.1 dwg

ethod of electron-beam welding of dissimilar ferro- and paramagnetic materials // 2635445
FIELD: electricity.SUBSTANCE: method comprises forming an austenitic seam structure by displacing the electron beam relative to the joint of the welded parts while ensuring a given penetration rate of the edges. The displacement of the electron beam is made periodically alternately across the joint with the amplitudes A2 and A1. The value of the beam axis displacement on the paramagnetic material A1 is chosen up to r, where r is half the width of the seam when welding with a static beam. The value of the displacement on the ferromagnetic material A2 is determined by the design formula, depending on the penetration degree of the edges of the paramagnetic material, equivalent chromium content in the paramagnetic and ferromagnetic materials, equivalent nickel content in the paramagnetic and ferromagnetic materials, respectively. The duration of the beam stay on the paramagnetic and ferromagnetic materials is determined by the design formula, depending on the period of the alternating beam displacement, which is substantially shorter than the transition time to the steady-state heat conduction process in the weld pool, the frequency of the alternating beam displacement and the specific heat and thermal conductivity of the paramagnetic and ferromagnetic materials, respectively.EFFECT: improved accuracy of the penetration degree of the welded edges.2 dwg

Dissimilar materials bonding with electronic beam technique // 2635123
FIELD: electricity.SUBSTANCE: grooves (3) are made in the detail, which is made of the low-melting material. The protrusion (4) is made in the detail, which is made of the heat-resistant material, to match with the groove. The ruled welding surfaces are obtained in the joint zone. The groove (3) and the protrusion (4) are fused together when assembling the joint zone, providing the hard contact in between. The scarf butt joint with the variable clearance between the ruled welding surfaces in the shape of the toe-in angle is formed. The brazing is carried out with the electronic beam (5). The beam (5) is moved in reference to the edge towards the low-melting detail (1) over a fixed distance. The low-melting detail (1) is melted and the permanent joint is formed after the crystallization. The cylinder details that are made of the dissimilar materials are connected to each other with the ring seam. The plain details that are made of the dissimilar materials are connected to each other with the longitudinal seam.EFFECT: welding stress and deformations reduction, expulsion from the weld area of the intermetallic phases, which enhances the strength and the tightness of the details permanent joint.8 cl, 4 dwg, 1 tbl

achine for contact butt welding of rails // 2634970
FIELD: transportation.SUBSTANCE: one of the two machine bodies is arranged movable relative to the other. The rods of displacement-draft cylinders are arranged to provide the effect on the movable body. Between the bodies, there is a fin cutting device. Behind the movable body, there is a rear thrust element. Each body is equipped with a rail lifting mechanism, rail clamping cylinders, clamping jaws. Guides for moving the movable body are arranged parallel to the longitudinal axis of the rails to be welded, pass through the movable body, are connected with their ends to the fixed body, and with the other ends to the rear thrust element. On each side wall of the body, there are two cylinders for clamping the rail to be welded, located opposite each other symmetrically with respect to the longitudinal axis and turned on in the opposite way. The piston cavities of both opposing clamping cylinders are interconnected in pairs.EFFECT: improving the quality of the welded joint, increasing the efficiency and wear resistance of welding equipment, reducing energy consumption.14 cl, 5 dwg

Friction welding method with aluminium wrought alloys mixing // 2634402
FIELD: metallurgy.SUBSTANCE: welding tool with a pin with the length of 5.8…11.8 mm, cylindrical in shape, with left-hand thread and support collar with the diameter of 18…28 mm is used. Before welding, sheet parts with the thickness of 6…12 mm are fixed in the vice and the welded edges are milled along the plane. The rotary tool is immersed into the joint of the parts to be connected to the predetermined depth equal to 95-98% of the thickness of the welded parts. The tool is immersed into the joint of the parts to be connected with a minimum speed of vertical movement 10…16 mm/min and a high speed of rotation 300…500 rpm, while the tool angle is changed with respect to the vertical axis from 0° to -1.0°…-2.0°. The immersion depth of the tool is adjusted in accordance with the axial force values obtained from the machine feedback sensors. Then, while maintaining the angle and speed of rotation, the tool is moved along the joint line at a speed of 300…400 mm/min with constant axial force of 23…34 kN. On completion of the welding, the rotary tool is raised and removed from the joint.EFFECT: method allows to increase the hardness of the welded seam.9 dwg, 1 tbl, 1 ex
ethod of friction welding with mixing of aluminium alloys // 2634389
FIELD: technological processes.SUBSTANCE: invention can be used for making butt joints of details made of aluminium heat-resistant alloys of thickness 2…6 mm. A welding tool with a pin is used made in the form of a flattened cone with a length of 1.8…5.7 mm with three "left" thread grooves, and a supporting ledge with a diameter of 8…18 mm with a spiral groove. The tool is immersed into the joint of the connected details with a minimum speed of the vertical displacement 7…12 mm/min and high rotation velocity 350…500 rpm until a predetermined depth of 90…95% of the thickness of the welded details is achieved. The angle of the tool is changed relative to the vertical axis from 0 to -1.5…-2.5°. Then, keeping the angle and rotation velocity, the tool is moved along the joint line at a speed of 220…300 mm/min at a constant axial force of 12…15 kN, controlled by feedback sensors.EFFECT: tool runout is prevented, internal defects are eliminated and the strength of the welded joint is ensured.2 dwg

Device for contact point welding with cooling electrode-cap // 2633810
FIELD: electricity.SUBSTANCE: holder has a cavity under the coolant supply tube and a transverse window connected to the cavity for removing the coolant. The electrode-cap is mounted on the front of the holder with a clearance relative to its end. There is a cap in the rear part of the holder, in the cavity of which the rear end of the tube is fixed. The hollow cap has a longitudinal window for the supply of the coolant and is installed in the cavity of the rear part of the holder through the sealing elements sealing the gap between the surfaces of the tube and the cap. At the front end of the holder, the inner chamfer is made, and the end of the tube has a shape corresponding to the shape of the said chamfer and the cavity of the electrode-cap. The tube is installed in contact with the bottom of the electrode-cap cavity, and transverse grooves are made on the front of its front part.EFFECT: increasing the resistance of the electrode-cap working surface by eliminating the stagnant zone with the coolant in its cavity.1 dwg

Device for contact point welding with cooling electrode-cap // 2633809
FIELD: electricity.SUBSTANCE: electrode-cap is placed on the conical surface of the front part of the holder to form an axial gap between the bottom of the cavity of the electrode-cap and the front end of the holder. The coolant supply tube is installed with a side gap in the longitudinal channel of the holder sealed at its front end and open to the axial gap. On the conical surface of the holder, longitudinal grooves are provided that are open on one side to the axial gap, and an annular groove with a sealing element installed therein for sealing the mating surfaces of the holder and the electrode-cap, into which the longitudinal grooves of the holder on the other side thereof are exposed. The axial longitudinal channel of the holder is connected by transverse windows formed in the wall of the holder, with longitudinal and annular grooves. The coolant circulates along the longitudinal channel, the transverse windows, the outer grooves of the holder, the axial gap between its front end and the bottom of the electrode cavity and is withdrawn through the tube beyond the holder.EFFECT: effective cooling ensures an increase in the resistance of the electrode-cap.1 dwg

Spot-weld joint and method for spot welding // 2633414
FIELD: metallurgy.SUBSTANCE: value of the carbon equivalent of Ceq of a high-strength steel sheet is 0.20 to 0.55 wt %. In the heat-affected area in a square region, which one side length is 10 mcm, there are ten or more grains of iron-based carbides, the length of the longest part of each of which is not less than 0.1 mcm. The joint is made by the main welding when applying current to the welding electrodes in the state of compression of superimposed steel sheets, cooling the steel sheets after completion of the main welding while maintaining the compression force and re-applying to the welding current electrodes.EFFECT: improving the peel strength of the spot-weld joint.3 cl, 12 dwg, 8 tbl

ethod of resistance spot welding // 2633413
FIELD: metallurgy.SUBSTANCE: sheets are welded by means of a pair of welding electrodes connected to a power supply for spot welding using a direct current inverter current. At first multiple repetitions of current transmission and stops of current transmission are performed at compression of steel sheets by welding electrodes with formation of a weld point. After the pulse process, a continuous current transmission is carried out for longer period of time, then maximum time of the current transmission in the pulse process when the steel sheets are compressed by the welding electrodes. Steel sheets are welded. During continuous current transmission, maximum current value is set below maximum current value in pulse process.EFFECT: method makes it possible to obtain weld joints of high quality with use of wide range of inverter direct current.8 cl, 11 dwg, 3 tbl, 3 ex

ethod of resistance spot welding // 2633409
FIELD: metallurgy.SUBSTANCE: method can be used for resistance spot welding of high-strength steel sheets, having the carbon content of at least 0.15 wt % and the tensile strength of at least 980 MPa. The joint is obtained by spot welding, which includes the current I1 supply for the welding spot core formation, cooling without the welding current supply and the heat treatment for the welding spot core metal release, when the current I2is supplied. The ratio of the current I2 to the current I1 is choosen from 0.5 upto 0.8. The cooling process time tc is selected in the range from 0.8×tmin upto 2.5×tmin, where tmin is calculated in accordance with the steel sheets thickness H, using the equation tmin = 0.2×H2. The heat treatment time t2 is selected in the range from 0.7×tmin upto 2.5×tmin. The applied pressure value at the welding spot joint cooling stage is greater than the pressure at the core formation stage. The electrodes pressure is maintained during the cooling stage and until the heat treatment is complete.EFFECT: obtaining the high and stable characteristics to resist the delayed fracture, while simultaneous suppressing of the hardness decrease during tempering.2 cl, 4 dwg, 3 tbl, 3 ex
ethod of joining metal parts // 2633171
FIELD: metallurgy.SUBSTANCE: invention can be used for joining metal parts (11, 12) having a solidus temperature above 1000°C. A pour point depressant (14) is containing phosphorus and silicon to reduce melting point on the surface (15) of the first metal part (11) is applied. The second metal part (12) is driven in contact with the pour point depressant (14) at contact point (16) on the surface (15). The first and second metal parts are heated (11, 12) to temperature above 1000°C and melting of surface layer (21) of the first metal part (11) is provided to form together with the pour point depressant component a layer of metal (210) which is in contact with the second metal part (12) at the contact point (16). The connecting seam (25) formed during solidification of the molten metal at the contact point (16) contains at least 50 wt % of metal, which was part of any of the metal parts (11, 12) before heating (203).EFFECT: simple and reliable joining method provides generation of strong seam between the parts.17 cl, 21 dwg, 8 tbl

ethod of manufacturing bimetallical steel and aluminium contact rails // 2632750
FIELD: construction.SUBSTANCE: plurality of rail bearing profiles of aluminium or an alloy thereof is manufactured with corresponding face surfaces of their heads. The profiles are laid parallel to each other on a horizontal platform with their faces oriented upwards, so that there is a gap between the heads of any two adjacent rail bearing profiles of said plurality. After that, a single steel sheet is installed over the faces of the plurality of the rail bearing profiles laid in this way, with an offset from these surfaces. An explosive is applied to this sheet on top over its entire area, and the explosive initiation is carried out, which determines the process of welding by blasting of steel contact pads against the faces of the heads of the rail bearing profiles.EFFECT: simplifiying the manufacture technology of contact rails due to the simultaneous formation of a plurality of bimetallic rails by means of welding a single steel sheet to the plurality of the bearing profiles and cutting this steel sheet into parts along the perimeters of the heads of these profiles.3 dwg
ethod of producing composite products with inner cavity by means of explosion welding // 2632503
FIELD: technological processes.SUBSTANCE: inside the cavity-forming element in the form of a titanium tube with a wall thickness of 3-4 mm, a central cavity-forming element of glass with a wall thickness of 10-15 mm is placed coaxially. The gap between them is filled with a water filler. After sealing the resulting assembly, it is placed coaxially inside the tubular sheath with a wall thickness of 3-4 mm. In the gap between them, a tubular bimetallic interlayer with an outer copper layer of 1-1.2 mm and an inner layer of niobium with a thickness of 0.8-1 mm is placed coaxially. Explosion welding is carried out on regulated modes. For one act of explosive impact an all-welded composite product of cylindrical shape with an internal cavity without axial symmetry violation and tightness of the metal layers is produced.EFFECT: product has a low hydraulic resistance of the internal cavity per unit length of the product when the heat transfer medium passes through it and high thermal resistance of its four-layer wall during heat exchange of substances in its internal cavity with the environment.3 dwg, 1 tbl, 3 ex
ethod of producing composite products with inner cavity by means of explosion welding // 2632502
FIELD: technological processes.SUBSTANCE: inside the bimetallic cavity-forming element in the form of a pipe with an outer layer of nickel and an inner layer of aluminium, a central cavity-forming element made of glass is placed coaxially. The gap between them is filled with a water filler. After sealing, the resulting assembly is placed coaxially inside the pipe-like bimetallic shell, the outer layer of which is made of aluminium and the inner one is made of nickel. In the gap between them a pipe-like intermediate deposit made of copper is placed coaxially. Explosion welding is carried out followed by annealing the welded shell.EFFECT: for one act of explosive action with subsequent annealing of the welded workpiece, all-welded composite product with an inner cavity with an axial symmetry is obtained which has high heat resistance of its surfaces in oxidizing gas media and low thermal resistance of its multilayer wall during heat exchange of heated gases supplied to the internal cavity of the article, with the environment.3 dwg, 1 tbl, 4 ex

ethod of producing composite products with inner cavity by means of explosion welding // 2632501
FIELD: technological processes.SUBSTANCE: inside the bimetallic cavity-forming element in the form of a pipe with an outer layer of nickel and an inner layer of aluminium, a central cavity-forming element made of glass is placed coaxially. The gap between them is filled with a water filler. After sealing, the resulting assembly is placed coaxially inside the pipe-like bimetallic shell, the outer layer of which is made of titanium and the inner one is made of niobium. In the gap between them a pipe-like intermediate deposit made of copper is placed coaxially and explosion welding is carried out followed by annealing the welded shell.EFFECT: resulting all-welded composite product with an inner cavity with an axial symmetry has a high quality of welded joints, has high heat resistance of its inner surface in oxidizing gaseous media and corrosion resistance of its outer surface during heat exchange with the environment of heated gases supplied to the inner cavity of the product.3 dwg, 1 tbl, 4 ex

ethod of electric arc multi-electrode welding under flux of longitudinal joints of thick-walled large-diameter pipes // 2632496
FIELD: technological processes.SUBSTANCE: in the zone where the molten metal bath crystallizes, the molten flux is removed. The forced cooling of the weld joint is carried out on the side of the flux-free weld seam from the temperature of the welded joint, not less than the temperature of the transformation beginning of the austenite Ar3 and to the temperature of its termination. Forced cooling is carried out by supplying water, air, or a combination thereof. Before removing the molten flux, unmelted flux is removed.EFFECT: increasing the toughness of the welded joint at negative temperatures, reducing the coarse grain zone.3 cl, 1 dwg, 1 tbl
ethod for induction surfacing of items of end surfaces // 2631565
FIELD: metallurgy.SUBSTANCE: heat-resistant cord along the weld surface is mounted or glued. The facing charge is loaded on the surface limited with the cord. Surfacing is carried out by high-frequency generator operating at 66 kHz frequency. Heat-resistant asbestos cord is prepared by soaking in glass liquid solution, dried and hold in 5% alcohol rosin solution.EFFECT: reducing the complexity of item and charge preparation and surfacing process.2 cl, 5 dwg, 1 tbl, 3 ex
ethod of ultrasonic welding of solid and bundle conductors from non-ferrous metals // 2631438
FIELD: technological processes.SUBSTANCE: weldable conductor parts are pre-wetted with a liquid evaporating flux in the form of brine, for example, based on ammonium nitrate. Welding is carried out in a wet state. In the process of welding, the liquid flux base is evaporated, which reduces the temperature of the tool surface in the contact zone, and a part of the dissolved flux material passes into the finely dispersed phase and deposits on the surface of the welding tool, forming a heat-insulating microlayer.EFFECT: invention allows to improve the quality of welded joints of solid and bundle conductors from non-ferrous metals.3 cl

achine mso-1201 for resistance butt welding of short articles of compact section // 2628948
FIELD: metallurgy.SUBSTANCE: in the fixed and mobile frames, clamps are mounted with fixed and mobile welding electrodes. The drive of the mobile frame movement is formed as a cylinder with a proportional distribution valve, precipitation valve and the sensor of it position. Removable hydraulic stops are mounted on the movable and fixed frames at both sides of the clamp. The hydraulic cylinder of each stop provides pressing of the ends of short workpieces to retain them in clamps during melting and precipitation. Each pair of welding electrodes is provided with a flat hard-alloy plates through which welded product is supplied by hydraulic stops for deburring.EFFECT: machine provides reliable clamping of short workpieces in clamps without increased efforts and combination of welding and deburring after resistance butt welding.3 dwg

Device for resistance spot welding of rods // 2628718
FIELD: electricity.SUBSTANCE: device contains a holder and a prismatic electrode. At the end surface of the holder, N even longitudinal or transverse closed grooves are made, pairwise separated by N-1 walls, which surfaces are supporting surfaces for the end surface of the electrode, with the formation of a coolant circulation area. A part of the grooves is connected to the windows made in the holder, one of which is intended for supply and the other one - for discharge of the coolant. A sealing gasket is installed on the holder to seal the coolant circulation area.EFFECT: effective cooling of the prismatic electrode.2 cl, 3 dwg

Head of electric point welding for multi-axis industrial robot and robot containing this head // 2628451
FIELD: electricity.SUBSTANCE: head includes a supporting member with an end portion for attaching to the robot wrist, a pair of welding electrodes held by the arms mounted on the supporting member with the ability to move between open and closed positions, an actuator and an electrical transformer provided with a casing, on different walls of the casing.EFFECT: increasing the compactness and electrical reliability of the device.7 cl, 18 dwg

Application of superflowing with application of powder flux and metal // 2627824
FIELD: metallurgy.SUBSTANCE: powder layer (14) disposed on the substrate (12) of the superalloy containing flux material and metal material is heated energy beam (16) for forming the cladding layer (10) and of a superalloy layer (18) of the slag. Give the molten bath to cool and solidify to form a slag repaired surface of the desired superalloy material. Material is fed in the form of a superalloy wire or strip into the molten bath. Filler material contains only a subset of the extrudate from the elements defining the desired superalloy material. Extruding the filler material in the form of wire or tape may be, for example, nickel, nickel-chromium alloy or nickel-chromium-cobalt.EFFECT: improvement of the application of technology.10 cl, 6 dwg

Soldering compositions // 2627822
FIELD: metallurgy.SUBSTANCE: soldering contains the mixture of powder components, one of which is the first soldering alloy, and the second powder component is the second soldering alloy or metal. The soldering contains the additional powder component, selected from the group consisting of carbides, nitrides, metal oxides and carbon nanotubes. The immiscible while heating alloys are used as the first and the second soldering alloys, the melting temperature of which varies within 10°C.EFFECT: soldering has good thermal fatigue life and low high temperature creep, as well as the high ductility and high plasticity and electrical conductivity.20 cl, 16 dwg
ethod for reconstruction of platforms for compressor blades in gas turbine engines (gte) // 2627558
FIELD: engines and pumps.SUBSTANCE: determine the lines for cutting the platforms for repair. Remove the defective parts along the said line. Fabricate the hard-alloy material plates of thickness not more than 0.9 mm with through slots along the contour, coinciding with the planes of the platform repair cut. Fix them on the cut planes with the requirement to maintain the specified length of the platforms, perform heat treatment and final finishing machining. In this case, after removal of the defective parts of the platforms along the specified line of the repair section, a layer of titanium alloy of a given thickness is cladded onto the repair section, and then the plates are fixed using the induction soldering.EFFECT: method will increase reliability of the product during its operation, increase service life of the blades in 1,5-2 times.5 cl, 3 dwg

ethod of electron-beam welding of a plate with finned surface // 2627553
FIELD: metallurgy.SUBSTANCE: welding is carried out from the side of plate. Preliminary places of welding are applied on the outer surface of plate, coinciding with the places of welding on the finned surface. In welding places single-stage through-holes are made with decreasing diameter in the depth of plate. Welded parts are combined. Pins are set in holes made in plate before contact with the fin. The height of pin exceeds the depth of inner hole in plate. After that, spot welding is carried out in the places where pins are installed. The height of pin protrusion into the outer hole is at least half of its depth. Plate and finned surface can be made of thin-sheeted titanium alloy.EFFECT: minimum values of post-welding deformations, high accuracy of assembly of welded parts, excluding their mutual displacement, and possibility of obtaining quality welded joints in different spatial positions.3 cl, 1 dwg, 1 ex
Flux gel for aluminium soldering and method for its production // 2627538
FIELD: metallurgy.SUBSTANCE: flux in the form of gel contains salt components and a binder in the form of a 2-4% solution of polyisobutyl methacrylate in white spirit with the following components ratio, wt %: chloride magnesium 36-38, sodium chloride 7-8, aluminium fluoride 3-5, potassium fluoride 3-5, potassium chloride is the rest. The pre-mixed salt flux components are melted. After the resulting melt is cooled, the solid flux is ground in the binder to produce colloidal gel.EFFECT: flux gel structure provides resistance to air humidification, convenient spot flux application and good solder spreadability.2 cl, 1 ex
Flux for soldering aluminium // 2627311
FIELD: metallurgy.SUBSTANCE: flux contains components in the following ratio, wt %: lithium chloride 31-33, aluminium fluoride 2-4.5, barium chloride 18-19, potassium fluoride 1.5-3, tin chloride-3-10, potassium chloride is the rest. To obtain the flux, melting of potassium chloride, lithium chloride and barium chloride is carried out at a temperature of 750-770°C and a mixture of potassium fluoride and aluminium fluoride is added to the melt. The melt is poured and colled. The obtained solid alloy is ground and mixed with 3-10% tin chloride. The charge is melted at a temperature of 450-500°C and the fobtained flux is poured into bars.EFFECT: flux provides high spreadability of solder and activation of aluminium surface at solder melting point.2 cl, 5 ex
 
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