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Electrodes of the same cross section are fed to a melting zone simultaneously at the same speeds parallel to each other. In front of a welding head in the surfacing direction there supplied is flux with formation of a layer with height H1, which makes it possible to perform surfacing in an electroslag mode. Behind the welding head there supplied is flux with formation of a layer with height H2 to protect a welding bath. Ratio of the above layers is chosen within H2/H1=0.4÷0.8. Distance between electrodes at their supply to the melting zone is controlled within 4.0 to 30 mm. |
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At least a piece of metal part is formed with the width L and the height H. Metal is delivered using welding equipment by welding rod in shielding gas environment (MIG), containing pulsating current generator and device for wire pulsating delivery. Current value and wire delivery are measured. Metal is formed by CMT method in the form of deposited beads (10) in several serial arranged layers. At least for one of two layers B, C arranged above the first layer A, realised is the first deposited bead (11', 21') being centred on cross-section of two first deposited beads (11, 21) of the first layer A. Then the second deposited bead is realised (12', 22') considering overlap on the first deposited bead (11', 21'). Quantity of deposited beads is so that the surface covered with these deposited beads is exceeding width L of this part piece. |
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Invention relates to metallurgy, particularly, to roller for hot material support and transfer, particularly, continuously cast steel blank at roller table or at continuous casting unit. Proposed roller comprises body consisting of roller shell from parent steel containing up to 0.45 wt % of carbon and wear layer applied on parent metal by one-pass building up using the filler. Wear layer in, at least, roller shell outer surface has the following composition, in wt %: 12.5-14.0% - Cr, 0.10-0.18% - Nb, 3.4-4.5% - Ni, 0.6-1.0% - Mo, 0.12% - N, 0.7% - Si, 0.6-1.2% - Mn, 0.06-0.14% - C, not over 0.025% of S, not over 0.025% of P, Fe and impurities making the rest. Spread of contents of every alloying element makes +/-5%. |
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Method of making metal coating on tiller cutting edges Invention relates to welding. Proposed method comprises producing briquette-shape filling material. Briquettes consist of the mix of powders wherein nano-sized hardening particles make 0.1-0.4% of surfacing metal amount. Binding component represents 4-5%-water solution of carboxymethyl cellulose. Then, briquettes are dried to complete hardening. Briquette is placed onto facing surface. Then coating bead is built up by complete dissolution of filler briquette and, partially, of article metal with penetration depth of 0.1-0.5 mm. Every other briquette is placed on facing surface after dissolution of previous briquette. Now, bead after bead is built up to make two and more layers of coating. |
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Method of making structure at metal part surface Proposed method can be used in production of connector 6 on metal party surface 4 in the form 3D structure 1 raised above the surface. Welding 7 is carried pout using at least one fused extra material 2. In welding cycle 8 of welding process 8 electric arc 3 is initiated between extra material 2 fed into welding torch 5 and part 4. Heat feed in welding process 7 is adjusted by setting of welding conditions. 3D structure 1 is composed stepwise of several separate elements 6. Every said separate element 6 is produced in one welding cycle 8 while after every welding cycle 8 break is performed in welding. Every welding cycle is started by arc initiation and terminated before the break 9. Electric arc 3 is quenched by adjustment of welding parameters. Separated element made in previous welding cycle is connected with separate element produced in the next welding cycle 8. |
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Invention relates to parts reconditioning by buildup under welding compound layer. Buildup head comprises mechanisms to feed main and filler wires, current conducting element with main wire feed channel, nozzle to feed filler wire there through for doping of buildup layer. Jet and adjustment mechanism with adjustment screw are arranged at current conducting element case. Case of said adjustment mechanism contacts via insulator with filler wire feed nozzle. Extra spherical insulator is secured at nozzle end. Extra filler wire nozzle is secured on both or one side from current conducting element. Extra filler wire nozzle and current conducting element are located in one plane perpendicular to machined part rotary axis. |
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Method of welding and structural element Invention may be used in repair of structural elements using damaged area recess filling by welding. Recess 4 features outline 16 to locate structural element outer surface 13 relative to recess 4. Recess 4 is filled with a layer of beads, preferably, with the use of laser welding. To prevent joint flaws and cracks layers are applied to make beads get onto outer surface 13 outside of recess outlines 16. Several layers of beads are used for filling recesses 4 unless the last layer is completely extended beyond surface 13. |
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Method of arc welding or building-up Invention relates to machine building and may be used for reconditioning or making parts for engineering industry. Proposed method comprises making the seam along with force application to welding-building-up pool tail section. Said forced application is created by producing sound radiation from the side of forming element. Said forming element is located above welding-building-up pool tail section. Distance between forming element surface and seam surface is set such that forming seam height is reduced to required magnitude. Ultrasound concentrator is used as said forming element. |
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Method of reconditioning railway vehicle wheel rim Proposed method relates to railway transport and may be used for reconditioning worn-out surfaces of car wheel rim by building-up. Proposed method comprises removal of worn-out flange and heating wheel rim to 200-250°C. Then, alloyed metal is built up on rotary wheel surface by means of crystalliser in electroslag hard-facing process using welding wire and flux with simultaneous built-up metal tempering. Crystalliser inner surface cross-section mates the profile and parameters of wheel standard rim. Building-up is performed parallel with wheel axis in direction from the flange at simultaneous rotation of wheel and crystalliser. |
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Invention relates to arc welding, particularly, to plasma surfacing of filler powder by direct-action contracted arc. Proposed method comprises feeding filler powder into stream of contracted arc via bin outlet metering hole. Filler powder is fed into arc stream in continuous vertical flow. Plasmatron is arranged at angle to said flow. Bin discharge chamber is communicated with atmosphere. Continuous or pulsating air or gas flow is fed via narrow cylinder channel to filler powder flow. In compliance with one version, metering hole is shut off by said narrow-cylinder channel. |
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Invention may be used for surfacing flat metal part with surfaces subjected to abrasive wear. Plate electrode is made to follow configuration of padding on blank 2. Note here that substance 3 with low ionisation potential is applied on one of the surfaces of plate 1 to set the arc spontaneous displacement path in surfacing. Distance between adjacent sections is selected to exceed two lengths of the arc. Then, coating is applied on the plate for consumable electrodes, its thickness being equal to arc length. Said plate electrode is secured on padding of blank 2. Electrode is connected to one pole of current source 7 while blank is connected to opposite pole. Electric arc is fired to melt consumable electrode metal so that fused metal layer is formed. |
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Method of arc deposition of copper and copper alloys on steel Invention may be sued for making working parts from steel with deposited copper or copper alloy layers adding to their antifriction properties, rust resistance, electrical conductivity, etc. Pasty flux is applied on steel part surface to be built-up to weld copper filler strip by spot seams. Then, arc deposition is performed in argon using nonconsumable electrode and filler of copper or copper alloy with complete fusion of aforesaid welded strip. |
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Bearing surfacing method and system Device (10) included in the system comprises processor and burner (18). Clamping device (56) included in the system and used to fix the position of bearing (76) in relation to the above device is located near that device. Hard-faced surface of bearing faces the above device during surfacing process. Processor has the possibility of controlling the operation of the device for providing the repair of the whole damaged internal surface of bearing by means of multiple application of the surfaced bead. |
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Method of making wear-proof bimetallic sheet Invention relates to welding. Proposed method comprises arc deposition of coating from wear-proof deposition material on surface of rolled sheet of carbon and low-alloy steels. Rolled sheet is subjected to forced cooling in coat deposition. Cooling medium acts on sheet free surface from below. Said coating is produced in layer-by-layer way. Rate of power input for every said layer is varied subjected to coated rolled sheet temperature. Forced cooling is performed when rolled sheet temperature exceeds tolerable heating temperature. Said tolerable temperature corresponds to that of carbide phase formation temperature. Water solution of sodium chloride is used as cooling medium. Said coating is either solid or intermittent layer. |
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Invention may be used for surfacing parts subjected to active intensive wear effects at higher temperatures and multiple temperature differences, for example, hot rolling rolls, etc. electrode outer surface is made of steel or nonferrous metal. Powder filler comprises components in the following ratio, in wt %: tungsten carbide, at least - 50, cobalt - 6-10, nickel - 3-4, titanium carbide - 5-7, copper - 0.25-0.5, iron powder - 10-20, fluorite - 5-10, rutile concentrate - 4-7. To make antiwear layer on foundry equipment surface is performed by depositing aforesaid composition by electrode at the rate of 100-150 m/h at current density of 200-450 A/mm to antiwear layer thickness of 1-12 mm. |
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Application method of wear-resistant coatings on working surface of parts of tillage machines Method involves arc surfacing of working surface along reinforcement lines with wear-resistant filler material. Density of filler material is higher than that of parent metal of the part. Compression stresses on thickness of working surface are created at cooling of the part. Surfacing of working surface along reinforcement lines is made in the form of points of wear-resistant material with layer thickness of 0.8-2.0 mm. Points of wear-resistant material are located at some distance from each other with covering of gaps of parent metal between adjacent points in the direction of working surface movement of the part. Surfacing of each next point along reinforcement lines is performed at the speed providing the covering of thermal influence zones of adjacent points with formation of hardening structure on thickness of parent metal of working surface. |
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Invention relates to the field of agricultural engineering, in particular, the tillage details of working bodies of tillage machines. The working surface of the hoe blade on the back is reinforced with thermal-deformation effect to provide hardness of the back working surface of the hoe, exceeding the hardness of the outer surface of the blade, and the preservation of the hoe geometry. |
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Method of centrifugal deposition by consumable electrode Invention is used in arc deposition by consumable electrode made from metal with fusion point lower than that of article metal. Proposed method comprises feeding consumable electrode into deposited article cavity via guide channel of rotary welding torch. Welding torch is revolved in plane, in direction of article rotation. At a time, welding torch is displaced along article rotational axis for deposition in screw line. Prior to deposition, electrode is arranged with angular shift to torch rotational axis. The latter is displaced through definite distance. For deposition by electrode made of metal with fusion point lower than or equal to that of article metal, welding torch is rotated at angular speed lower than that of article. Then, the torch if fitted inside article cavity. For deposition by electrode made of metal with fusion point higher than that of article metal, welding torch is rotated at angular speed higher than that of article. Then, the torch is removed from article cavity. |
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Method of reconditioning and hardening plough shares Invention may be used in repair of tillage machinery, particularly, plough shares operated in conditions of abrasive wear. Beam-like wear on outer edge is sealed by low-carbon electrode material. After cutting edge forging, hardening rolls are welded on reconditioned surface. |
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Method of welding by three-phase arc Proposed method may be used for welding of wear-resistant hardening coats by three-phase arc. Third phase of current source is connected to article in half-cycle opposite that of connecting filler wire. Interval of half-cycles corresponds to that of welding current set by current source frequency. Connection of article and wire allows cathodic cleaning of their surface. Wire and article may be connected in AC half-cycles in both straight and reverse polarity. |
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Plowshare of increased resistance to abrasive wear Invention may be used in the manufacture of plowshares of plows for different purposes. Increasing resistance of plowshares to abrasive wear is achieved by welding on metal of high hardness (60 HRC) on the width of 7-8 mm along the landward edge and the blade part of the edge in the form of chisel and welding with deep penetration of the same alloy at the lower part of the edge at a distance of 60-80 mm. The rest is reinforced with filler by welding of rollers of width of 4-5 mm with a spacing of 30 mm by electrodes for welding carbon steels perpendicular to displacement of soil. |
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Method of producing ice cast-iron cylinder head valve seat or reconditioning them by arc deposition Invention may be used in reconditioning or producing internal combustion engine valves. Machining is carried out after valve surface cleaning and flaw detection. Seat is made by arc deposition on valve seat surface. Nickel sublayer is built up by short arc of forward polarity current in atmosphere of welding gas with forging the built-up bead at the rate not allowing metal chilling. Surface with nickel deposition is subjected to machining. Working layer of austenitic heat-resistant steel is deposited by consumable electrode with reverse polarity current and forging of every bead at the rate not allowing metal chilling. Seat working surface is subjected to finishing. |
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Ferromagnetic charge for arc pad welding machine parts made from iron-carbon alloys Invention relates to machine building and can be used to restore machine parts made from alloyed steel and cast iron. The ferromagnetic charge for arc pad welding machine parts from iron-carbon alloys, which contains carbon, ferrotitanium, ferrochromium, ferrovanadium, electrode marble, fluorpar, silicocalcium, copper powder and iron powder, additionally contains ferrovanadium and copper powder. To ensure stable arcing at low current (reducing the level of welding deformations and stress) and improve magnetic properties of the mixture, magnetic and nonmagnetic components of the charge are mixed on liquid sodium glass. |
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Method of reconditioning tillage equipment working tools with complex shape Invention may be used in reconditioning tillage equipment working tool surfaces with complex shape. Worn-out area is prefilled by electrodes made from wear resistant material to perform closing by fusion in one pass by electric arc manual or semiautomatic method to ensure maximum possible tracing of working surface. |
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Method of increasing life of tillage equipment working tools Invention may be used in reconditioning tillage equipment working tool surfaces. Rolls are welded on perpendicular to axis of beam-like wear, spaced apart for 20-30 mm to produce spacing between them. Roll height does not exceed the level of working surface of the part being reclaimed. Said spacing is filled in operation by soil that acts as anti-abrasive medium. |
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Method of reconditioning center hoes of tillage row-crop cultivators Invention may be used in reconditioning tillage equipment working tool surfaces. Metal stock is formed in point area and along blade length by electric arc deposition by electrode to produce buffer stock of built-up metal that allows recovery of rated sizes of hoes. Building-up may be carried out both manually and mechanically by electric arc deposition. Hoe is drawn out by hot deformation using forming mandrel that follows hoe point and blade shape. Further hardening is performed by quenching. In buffer metal building-up and drawing-out, thermal processes occur to bring about structural components that increase hardness of reconditioned zone and facilitate increasing resistance to abrasive wear. |
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Procedure for production of built-up coating on blade body of turbo-machine Strips of alloyed metals are built-up in direction of lengthwise generatrix of blade body ensuring gaps between built-up strips at least on part of blade body and forming layer. As built-up metal there are used alloys on base of nickel with Co, Cr, Al, Mo, W, Ti, Y or their combination. Further, a blade body is mechanically processed ensuring its specified geometry. Successive thermal treatment corresponds to thermo-cycling. |
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Turbo machine labyrinth seal repair Invention relates to recovery of turbo machine worn-out labyrinth seals and may be used in repair of various assembly units and parts with such seals, for example, vanes, carcass assembly in aircraft industry, power generation equipment and other machine building branches. Said seals are building-up welding with welding head and filler wire. Welding roll is produced on inclining welding head with filler wire toward part section that features higher heat dissipation. Note here that inclination of welding head with filler wire relative to labyrinth seal knife edge is set between planes of their symmetry to make 8-10°. |
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Surfacing method of wear-resistant coatings Surfacing is performed on the flux layer with wire from aluminium or its alloys. Flux containing chrome oxide and cryolite is used with the following component ratio, wt %: chrome oxide (III) 25-35, cryolite 65-75. Surfacing is performed in shielding gases in the modes allowing to obtain the coating containing 10-40 wt % of aluminium. |
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Method of building up antifriction layers Invention may be used in building up antifriction layers on surfaces of parts made from titanium alloys, particularly, ship fixtures. Automatic argon-arc building up of "ПТ-7М"-grade titanium alloy wire at built-up metal temperature of 1500-1550°C and roller pressure of 80-100 N. |
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Invention relates to welding industry, particularly to electroslag welding or facing and can be used to restore components with high mechanical wear, as well as for producing special quality tool steel via electroslag remelting. The flux material contains a scheelite concentrate as a doping and slag-forming component, with the following content of basic components, wt %: tungsten oxide 45-72, iron oxide 10-25, manganese oxide 2-10, silicon oxide 3-8, graphite as a reducing agent, calcium fluoride as a fluxing agent, baddeleyite concentrate as a modifier, with the following content of basic components, wt %: zirconium oxide 92-96, silicon oxide 4-8, with the following ratio of flux components, wt %: scheelite concentrate 65-72, baddeleyite concentrate 0.5-3.0, graphite 14-18, calcium fluoride 16-20. |
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Procedure for forming discrete welded coating on blade body of turbo-machine Procedure consists in local pad weld of coating on at least part of blade body and in dimensional processing. Regularly distributed crossing strips are pad-welded along surface of the blade body and form a net at their crossing. |
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Building up of wear resistant coats Invention may be used in applying coats of titanium alloys on parts operated in friction, impact loads etc. Wear resistant coat is applied using consumable electrode in atmosphere of protective gas. Welding wire from titanium alloys is used as consumable electrode without whatever extra processing. Built-up hardness results from doping built-up metal by oxygen added to protective inert gas. Oxygen content in gas mix makes up to 20%. Said oxygen content allows built-up metal hardness approximating to 5400 MPa. |
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Method of producing wear resistant working surface of tillage implement parts Invention may be used in agricultural machinery for increasing wear resistance of tillage implements by fusion welding. Wear resistant filler material is built up on part working surface, which represents parallel strips with 2-4 mm-thick layer at right angle to part working surface travel direction, space apart by not over 15 thicknesses of the layer. Built-up strips may be made up of alternate different-length sections spaced apart by, at least, the built-up strip width, or identical sections spaced apart by 1 to 3 their widths, or sections with length equal to width arranged at distance between them equal to their width, or staggered with spacing between adjacent strip sections being overlapped in direction of working surface travel. |
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Method of producing wear resistant heatproof coats Invention relates to machine building, particularly, to welding, and may be used in producing wear resistant heatproof coats in part from carbon and alloy steels. Proposed method comprises electric-arc building-up welding in atmosphere of protective gases using filler wire made from aluminium or aluminium alloys Building-up welding is carried in conditions that allow producing coat from aluminium solid solution in iron with non-equilibrium structure, and, thereafter, thermal treatment is performed to produce coat based on intermetallic phase of Fe3Al with aluminium content of 20-25 wt %. |
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Method of ploughshare recovery Invention may be used for recovery of ploughshare parts. Metal stock is formed on ploughshare rear, at ploughshare tip and along its length, by manual building-up welding by low-carbon electrode, or automated electric-arc welding. Built-up metal is expected to allow recovery of rated sizes of ploughshare. Hot straining is carried out using jig gauging ploughshare tip and blade. Surface hardening is carried out. |
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Invention relates to arc welding, particularly, to deposition by powder admixtures using direct plasma arc effect. Powder admixture is fed into plasma arc by gravity via metering opening of the bin discharge chamber with shut-off device and sent into arc column in continuous flow by powder admixture gravity forces. Plasma generator is arranged at an angle to flow, while bin discharge chamber is communicated with atmosphere. Powder admixture laminar narrow-cylinder flow is created to be directed into arc column axial zone to move on column surface. Admixture flow cross section is set smaller than arc column axial zone cross section in area of column maximum reduction. Bin discharge chamber metering opening length is set smaller than its flow section. Opening surface are machined to Ra not exceeding 0.2 mcm in rounding edges of inlet and outlet sections. |
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Electrodes of one or several groups are arranged with set-off in horizontal plane counter direction of rotation of a body with linear deviation from "zenith" at 5-20 mm and angular deviation from "zenith" over 30°. Distance between electrodes of each group is chosen from condition of forming common bath of liquid metal along whole width of weld pad. There is formed a circular pad of area equal to area of treated surface at rotation of the body and at simultaneous transfer of electrodes in direct and reverse directions along its generatrix; transfer is matched with feed of melt. There is formed the bath of liquid metal and slag stretched along the rotary body; ratio of its geometrical sizes is not less, than 3:1. Pad weld is performed at rate of lengthwise travel of electrodes, 28-32 times exceeding linear speed of body rotation. |
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Flux for electroslag welding or welding build-up in parts recovery or for electroslag remelting Invention can be used for recovery of worn out parts, e.g. car or locomotive coupler socket crosspieces, and production of high-quality tool steels by electroslag remelting. Flux comprises calcium fluoride as slag liquefier, reducer and scheelite concentrate as doping and slag-forming component that includes tungsten oxide in amount of 55-72, iron oxide in amount of 10-25, manganese oxide in amount of 2-10, and silicon oxide in amount of 3-8. Reducing agent represents ferrosilicon at the following ratio of components in wt %: ferrosilicon - 9-20, calcium fluoride - 10-28, sheelite concentrate making the rest. |
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Method of part surface recovery by hard-facing Invention relates to machine building, particularly to hard-facing recovery of the parts, e.g. solids of revolution, including automotive parts made from alloyed high-carbon steels. Proposed method comprises deposition by consumable electrode on worn-out part surface, the part being moved relative to electrode, producing deposition bath and feeding filler wire insulated from current into said bath. Note here that said filler wire is made from alloyed steel or nonferrous metals and alloys. Wire is fed at acute angle to consumable electrode feed direction ahead or after it in direction of part displacement and at a distance therefrom. |
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Method of induction-metallurgical recovery of steel part worn-out surface In build-up welding, the part is displaced relative to inductor, while inducing conductor of the latter is located along the arc of circle with its convex part facing the part displacement direction. Radius of said arc makes 0.5-2.5 of the built-up surface width, while lateral section of inducing conductor narrow section faces building-up drop surface with its axis of symmetry inclined to said surface at 25-115°. |
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Procedure for repair of steel structures by welding Invention can be implemented at repair of frames of drive electric engines of locomotives operating mainly under conditions of vibration loads. The edges of the crack are grooved crack and preliminary heated to temperature 200-250°C. Low alloyed ferrite electrodes are used for production of internal layers of multi-layer welding seam. The external facing layer has thickness of h =2-3 mm; zone of thermal influence is gradually overlapped with high alloyed electrodes out of steel of austenite class of the following composition, wt %: carbon - 0.04, silicon - 0.52, manganese - 1.33, chromium - 19.5, nickel - 9.2, sulphur - 0.013, phosphorus - 0.024, iron - the rest. Also there are created compressive stresses at phase transition γ → α in a welding seam. |
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Method for wear resistant welding Invention may be used for wear resistant welding onto articles of titanium and titanium alloys. In protective chamber 1, arc is excited between non-consumable tungsten electrode 4 and coated surface of item 3, and welding electrode 6 is supplied into zone of arc. According to the first version, it is made of pressed charge of exothermic mixture of powders of titanium, boron and/or carbon with ratio of titanium mass to mass of boron and/or carbon equal to 5-20, and alloying additives. According to the second version, welding electrode comprises rod of titanium or titanium alloy with charge applied on its surface in the form of layer of specified components in presence of binder. Reaction of exothermic mixture combustion is initiated. Welding layer 7 is applied by displacement of arc relative to surface of article with speed of exothermic mixture burning propagation that corresponds to speed of welding electrode feed into zone of arc. Front of burning reaction in process of welding is maintained at the distance from arc equal to 2-20 mm. |
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Invention refers to metallurgy, particularly to deformation-thermal treatment of nickel-aluminium coating with shape memory effect and can be implemented in metallurgy, machine building and medicine. The procedure for production of nano-structured nickel-aluminium coating on steel with shape memory effect consists in applying coating by means of plasma surfacing powder of NiAl with shape memory effect, in tempering at temperature 1000-1200°C and in successive cooling in liquid nitrogen. Further, plastic deformation of coating is performed in three stages. At the first stage it is carried out in the interval of temperature 300-350°C at degree of plastic deformation ε=4.5-10%. At the first stage plastic deformation is performed in the interval of temperature 350-400°C at degree of plastic deformation ε=10-15%. At the first stage it is carried out in the interval of temperature 400-480°C at degree of plastic deformation ε=15-40%. Also annealing is carried out at temperature 500-600°C during 1-1.5 h after each stage of plastic deformation. |
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Method for production of rails with antifriction welding Invention relates to methods for treatment of rails, namely to method for production of rails with antifriction welding for hump yards, and may be used in railway transport. Method for production of rails with antifriction welding consists in the fact that on surface of rail head rolling along its whole length grooves are cut at the distance of 25-30 mm from each other at the angle to vertical line of around 30°. Then surface of rail head rolling is heated up to 380-420°C, and welding is carried out. |
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Method of argon-arc welding of copper and its alloys on steel by nonconsumable electrode Invention may be used in manufacturing of units and structures from steel with production of working layer from copper alloy for provision of their corrosion resistance, electric conductivity, anti-friction properties. Prior to beginning of welding, filler rod is installed in the area of welding start at the angle to welded surface with rest of rod lower end against it, and welding burner is arranged at the angle to filler rod. Filler rod is welded in process of its motion without change in angle of inclination to welded surface, avoiding contact of arc with steel. Welding arc is transferred from filler rod to produced bath of melt material, and process of welding is carried out with an angle forward, maintaining constant angle of welding burner inclination and level of melt metal bath. |
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Method of worn-out steel parts restoration and strengthening Before building-up there is performed mechanical treatment of worn-out part to remove layer at depth sufficient for sealing microscopic fractures while applicating restoration layer. Sealing produces a restoration steel layer containing at least one of the following alloying elements, wt %: chromium 0.8-6.4, aluminium 0.5-1.5, and silicon 0.9-2.0. Further there is carried out anodizing in salt solution with current of 0.03-0.12 A/cm2 density during two hours at temperature 1025-1190 K using an auxiliary electrode; upon cooling the part is subject to finish mechanical treatment to a nominal dimension. |
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Recovery method of worn surfaces After cleaning of worn surface up to clean metal it is implemented heating of protected section of worn surface of rails up to temperature 400-450°C during 5-6 min. along the full its length and into both sides of section on value of technological envelope of metal, which is about 100 mm. It is implemented welding deposition by electroarc method at operating temperature not lower 350°C in layers for complete depth of worn surface with excess of mid-of-tolerance of rail roll surface for value of allowance for mechanical operation. At reduction of working temperature it is implemented additional heating of fused section of worn surface of rail. Then it is implemented self-cooling and mechanical operation of recovered surface of rail rolling. |
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Device for high-speed argon-arc build-up of cylindrical parts Invention may be used to restore worn surfaces of cylindrical parts, and also to provide part surface with specific physical-mechanical properties in process of their manufacturing. Body 1 of cooled welding head has channel 18 for feeding filler wire into welding bath. In plane of head body inverted to processed part, recess 19 is arranged in the form of truncated cone side surface segment. In process of build-up, head is installed in transverse direction at the same distance from built-up part, and in axial direction - as inclined to the side of build-up along part axis. Pins 3 are evenly arranged around outlet of channel for feed of filler wire. Tungsten electrode used in device is arranged with blunt sharpening angle of 90-110° and with rounding radius on top of this angle equal to 0.5-0.75 of electrode diametre. Number of pins makes at least three, besides area occupied with them makes not more than 30% of their location circumference area. |
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Installation of mechanised plasma welding deposition for details of type "shaft" Installation contains stand and installed in it carriage consisting of front and back mandrel for fixation of treated detail. Workhead drive installed on carriage consists of electric motor, drive belting, bearing mount assembly and tachometre generator. Workhead drive installed on carriage consists of electric motor, drive belting, bearing mount assembly and tachometre generator. Detail is installed in centers and as additional bearing for long-measuring details it is used centering device. On stand it is fixed blacket with located on it plasmatron, mechanism of wire feeding, device for thickness control of pad, pyrometre for heating control of detail surface before plasma arc front. On stand there are installed limit switches restricting movement of carriage. Movement drive, rotation drive, plasmatron with feeding mechanism of wire, device for control and pyrometre are connected to control assembly. |
Another patent 2513938.