Method of repair of longitudinal pipe weld, applied by laser welding

FIELD: technological processes.

SUBSTANCE: repair includes defect detection, defect sampling and sample filling. The equipment for defect detecting, sampling and sampling filling is installed to work through the control unit in a single coordinate system. In order to detect a defect ultrasonic testing is done by scanning along the weld line using ultrasonic transducers until the defect is defected, constructing a defect coordinate model in the meantime. The data from the coordinate model are used for setting sampling parameters, which are entered in the control unit, which carries out positioning of the milling head at the stage of defect sampling. And at the stage of sample filling it carries out the positioning of optical laser head, which cleans the sampling zone, and positioning of the filling equipment.

EFFECT: invention provides precise guidance of the repair equipment to the defect zone of the pipe weld, applied by laser welding, eliminates any defect in a laser weld with minimum sample size, maximum preservation of the weld geometry and minimizes heat transfer to the repair zone of the weld.

11 dwg

 



 

Same patents:

FIELD: process engineering.

SUBSTANCE: in repair of crankcase flange with bores for equipment fastening bots and made of unweldable materials a countersunk recess of made in said flange around the bore for bolt. Then, countersunk recess bottom is anodized to fit the washer therein and glued thereat by appropriate adhesive. Another invention of this set relates to crankcase of turbo machine such as aircraft turbojet or turboprop made of aluminium, steel or composite which includes the circular flange with bore for bolt. Circular flange is repaired as described above while said bore fits in countersunk recess whereto said washer is glued.

EFFECT: simplified repair.

10 cl, 4 dwg

FIELD: heating.

SUBSTANCE: invention relates to the recovery heat treatment of units of water-to-water power reactors (WTWPR). The method of recovery of physicomechanical properties of the material of intra-housing devices of the water-to-water power reactor after the action of operational factors includes extraction of the intra-housing devices from the reactor housing and their subsequent heat treatment providing heating, conditioning and cooling, heating is conducted up to the temperature of 975-1025°C, conditioning is performed at this temperature within 120-130 h, and cooling is conducted in air.

EFFECT: increase of the service life and ensuring the safe operation of VVER-1000 reactors.

1 tbl, 1 dwg

FIELD: engines and pumps.

SUBSTANCE: blades surface is prepared by machining of the defected places, by the blade sand blasting, cleaning and degreasing. To the entire surface of the blade body the underlayer of self-fluxing nickel-based alloy, for example "ПР-Н80Х13С2Р", with thickness up to 0.2 mm is applied by microplasma spattering, the alloy plays the role of heat-resistant solder. At that surface of the defected places is levelled with the rest surface. Surface of the said underlayer is subjected to the sand blasting. By plasma method layer of the heat-resistant material is spattered, for example "ВКНА", with thickness up to 0.6 mm with assurance of the specified blade profile. The blades with the applied coatings are heat treated in vacuum by heating to temperature of liquidus of the self-fluxing alloy, and holding at this temperature for 3-5 minutes.

EFFECT: increased operation properties of blades due to improved adhesion strength of the sputtered layer of the heat-resistant material.

3 cl, 1 dwg, 1 ex

FIELD: agriculture.

SUBSTANCE: invention can be used for application of wear-resistant coatings on working surface of parts of tillers, having a shape of oblique wedge using fusion welding. The wear-resistant filler material is applied to the said surface in the form of parallel strips with a thickness of the weld layer of 2-4 mm at a right angle to the direction of displacement of the working surface of the part at a distance from each other of not more than 15 times the layer thickness. The strips are applied to the upper and lower inclined faces in the area of compressing stress of the working surface of the part with a shift from each other by the same distance in the direction of movement of the parts. The width of the weld strips on the work surface of the parts is set not more the double thickness of the weld layer.

EFFECT: invention enables to reduce the wear rate of the working surface of the parts by deformation and reduction of the density of the surface active layer of the soil in the area of the greatest intensity of friction.

2 cl, 4 dwg

FIELD: machine building.

SUBSTANCE: invention relates to machine building, and can be used to restore the rubbing connections of internal-combustion engine of the diesel-generator plant (ICE DGP) of locomotive. Under the method restoration is performed without disassemblage of the wear details of ICE by application of the anti-friction layer to the restored surfaces in anode-cathode circuit, when ICE is used as cathode, and locomotive generator with current converter is used as current source, ensuring direct current in anode-cathode circuit un range 10…2000 mA. The anode is dissolving combined anode made out of located in series starting from surface layers of zinc, copper, copper-graphite, graphite, that are arranged at ICE input in flowing part of the lubrication system, lubricant is current conducting ion-generating liquid with additives, its temperature during restoration process is maintained within range 80-90°C for half of time period from start of the restoration process, and then within range 50-60°C till process completion.

EFFECT: invention increases resource and durability of ICE DGP tribosystem.

3 cl, 2 dwg

FIELD: transport.

SUBSTANCE: proposed process consists in dismantling of worn-out jaw-liner from axle box opening of bogie frame made of low-carbon steel and welding a new jaw-liner with working surface of high-carbon steel. First, new replacement jaw-liner is fabricated. Note here that high-carbon steel is applied on plate of low-carbon steel in two plies by hidden-arc welding to this end. Then, it is welded to axle-box opening by low-carbon surface.

EFFECT: higher weld strength.

2 cl, 2 tbl

FIELD: engines and pumps.

SUBSTANCE: according to the method the surface of worn-out main supports is coated by electrospark weld deposition and boring, and on worn-out main supports the combined two-layer coating is formed. The first electrospark layer is applied by non-rotating nichrome electrode with the cross-section 12-20 mm2 in manual mode with the impulse energy 4.3-10 J, the pulse duration 1000-2000 mcs, the amplitude value of the pulse current 240-280 A and amount of working pulses per second 50-100. The second layer is formed by cold gas-dynamic dusting of aluminium-containing powder with subsequent boring of obtained combined coating and a honing of all main supports until obtaining the sizes with required geometrical accuracy.

EFFECT: invention allows to increase process productivity by change of modes of electrospark weld deposition and decrease of process time.

1 tbl

FIELD: transport.

SUBSTANCE: proposed device is intended for rolling stock mounted axles. Device case accommodate drive of rotation, feed and cam chuck with spindle sliding therein and provided with cutting tool fixed thereat. Self-aligning cam chuck can be fixed at recovering axle journal or on fastening cover locating surface.

EFFECT: enhanced performances, better manufacturability.

9 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of metal reinforcing part (30) of turbomachine leading or trailing edge (10). Proposed process comprises fabrication of several elements (30a, 30b, 30s, 30d) with V-like cross-section. Said elements form different sectors of reinforcing part (30) distributed between its root (32) and top (34). Said sectors are places on appliance (40) that reproduces the shape of said edge. Said sectors are connected to make a complete profile of reinforcing part (30) with recombination of different sectors. To make said reinforcing part (30), appliance (40) is used composed of interconnected detachable sectors that make the surface reproducing the shape of leading of trailing edge of turbomachine blade.

EFFECT: perfected method.

13 cl, 6 dwg

FIELD: machine building.

SUBSTANCE: identification of piston defects is carried out and its worn out hole is machined by a reamer fixed in a machine chuck. Prior to machining the piston is installed in a mandrel rigidly fixed at the machine support and the piston hole for piston pin is axially centred by the reamer axis with the reamer being prevented from rotation, due to floating longitudinal movement of the piston along the mandrel walls and rotation of the piston around its longitudinal axis. The device comprises a reamer mounted at a lathe machine and consisting of lead-in, cutting and exit parts, by one end it is fixed in the machine chuck and the other end is pressed by the machine back centre. The mandrel for the piston consisting of a hollow cylinder is rigidly mounted on the machine support, two through holes for the reamer are made opposite each other on the side surface of the mandrel, the vertical axes of the cylinder and the reamer are perpendicular to each other.

EFFECT: invention allows for accurate machining of the surface of the holes for a piston pin, reduced consumption of spare parts and materials for engine repair, service life of pistons increased by at least 80% of new parts service life.

2 cl, 1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of steel sheet articles from different-depth steel sheet or strips. Billets are welded together along the butt to get the weld (7) composed by edges of steel sheet or strip workpiece. To rule out loss of quenched structure produced by heating to austenitising temperature, at least one edge of sheet or strip (8, 9) is coated before welding with thick fluid or solid powder or aerosol-like matter including at least one component increasing the strength of the weld (10).

EFFECT: higher weld strength.

28 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine for production of polar plates by laser cutting. This machine comprises bed, laser cutting assembly, cutting manipulator to drive laser cutting assembly, control system and at least one strip feeder. Strip feeder comprises manipulator for gripping, means for strip feeding to preset length and strip release means. Cutting and gripping manipulators are arranged at the bed. Means for strip feeding to preset length is arranged between gripping manipulator and strip release means. Control system is connected with cutting manipulator, gripping manipulator and means for strip feeding to preset length.

EFFECT: production of plates for lithium-ion storage batteries and super capacitors by laser technology, higher quality of plates.

10 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to laser plasma welding of metals and device to this end. Invention can be used for welding of such materials as steel and aluminium by combined laser plasma effects. Welding parts are preheated in the weld area by plasma flux. Laser beam is directed to but of welding parts. Produced weld is additionally heated by plasma flux. Plasma flux is shaped to circle while laser radiation is fed via geometrical centre of circular plasma flux to said butt. Device for laser plasma butt welding of metals comprises plasma flux and laser radiation sources. Plasma flux source comprises outer and inner ring electrodes to produce plasma flux located in one plane with their geometrical centres aligned at one point. Laser radiation source can feed laser radiation via said geometrical centre.

EFFECT: intensified welding, lower rate of weld cooling, higher strength of the weld.

2 cl, 1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates for surface processing to get glossy and dull sections. In compliance with this process, surface pre-coated with first copper ply and second ply including bottom nickel ply and top chromium ply is subjected to selective removal of chromium ply on sections to be frosted. Selective removal is performed by laser displaced above the surface. Note here that laser exposure and power are adjusted to get various texture. Then, ply of noncorrosive metal containing zirconium and chromium is evaporated from vapour phase on said surface.

EFFECT: production of glossy and frosted surface sections.

5 cl

FIELD: physics, optics.

SUBSTANCE: invention relates to a laser beam focusing head for laser cutting, a method and an apparatus for laser cutting of a metal component. The focusing head comprises a collimating lens (13) and a focusing lens (14). The collimating lens (13) and the focusing lens (14) are made of ZnS and have peripheral thickness of at least 5 mm. A deflecting mirror (15) operating at an inclination angle (α) from 40° to 50° is placed between the collimating lens (13) and the focusing lens (14) on the path of the laser beam. The laser cutting apparatus comprises a solid-state laser device (SL) emitting a laser beam with wavelength of 1.06 mcm to 1.10 mcm and power of 0.1 kW to 25 kW, said focusing head and a conveying fibre (CF) connecting the solid-state laser device (SL) and the focusing head.

EFFECT: invention provides a stable focusing position of a laser beam during cutting.

13 cl, 5 dwg, 1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to welding of at least two components 102, 104 of super alloys. In compliance with this process, mail weld 110 if made with the use of the first filler metal arranged between said components 102, 104 and weld surface 112 with the use of second filler metal made over the main weld. Spacer 506 is fitted between said components provided with optional flute 105 made along the surface 114 of weld 102, 104. Filler wire 504 is fed over preset surface 114 or inside said optional flute 105. Two lasers 700, 702 or laser 600 with connected beam splitter 604 produce first and second laser beams 508, 510. Said beams are directed at focus points 5122, 514 spaced apart through preset spacing (509), for example, 0.05-1.5 cm. First laser beam 508 is used for making of the main weld 110 with the help of fist filler metal between components 102, 104. Second laser beam 510 is used for making of the surface weld 112 with the use of second filler metal on the surface of the main weld 110.

EFFECT: perfected method.

9 cl, 8 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of pipes by laser welding. Laser welding comprises emitting of two laser beams along edges at open pipe upper surface. Said laser beams are transmitted via different optical fibre glass and have focused spots of diameters making over 0.3 mm. Said laser beams are emitted so that front laser beam and rear laser beam are inclined to welding direction. Note here that incidence angles are defined relative to direction perpendicular to open pipe top surface. Front laser beam falls on open pipe top surface in welding direction before rear laser beam while the letter falls on open pipe top surface in welding direction after front laser beam. Front laser beam incidence angle is set larger than that of rear laser beam. Gap between front laser beam centre and that of rear laser beam is set at open pipe rear surface equal to 1 mm and more.

EFFECT: higher quality of weld, higher yield.

17 cl, 4 dwg, 3 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: temporary beads 3 and 4 are made on thick 2 and thin 1 parts. The bead 3 height is by 3-4 times higher than thickness of part 1. Height of bead 4 is equal to height of bead 3. Bead 4 thickness is determined by equation S2=(1+Δ)·S1. Beads 3 and 4 contact surface is treated by ultrasound in ethyl alcohol. Parts 1 and 2 are secured in welding fixture. Butt joint gap and beads 3 and 4 shift at least 10% of part 1 thickness are ensured. Laser beam 5 is directed to butt joint of beads 3 and 4.

EFFECT: invention increases weld strength due to rational design of the temporary beads.

3 cl, 4 dwg

FIELD: metallurgy.

SUBSTANCE: device to manufacture items by layer-by-layer laser agglomeration of powders contains tanks for powder and powder surpluses, located between them module for item forming including table with drive of its vertical movement, device for powder supply to the table from powder tank, and powder discharge to power surpluses tank, optical laser system for agglomeration of the powder nozzles installed above the table for air or inert gas supply on the powder layer, and gas intake installed under the table with possibility of connection with vacuum system. The table is made gas permeable and is equipped with installed on its top surface of the refractory gas permeable plate intended for powder layer arrangement on its surface and agglomeration.

EFFECT: improved quality of obtained items.

1 dwg

FIELD: machine building.

SUBSTANCE: module comprises a guide belt, a movable orbital carriage mounted on the guide belt and able of travelling along it. The carriage includes a longitudinal movement drive and a moving device consisting of a carrying roller system and a gear wheel. A joint monitoring sensor, a welding wire reeling device and a handler are installed on the carriage. The handler consists of two mutually perpendicular linear guides with motors, which can move in respect to each other. The transverse linear guide is equipped by a laser welding head, a wire feeding unit, an arc welding torch, a video camera and a controller.

EFFECT: invention allows for the increase of productivity and efficiency of welding process for fixed ring pipe joints and for the improvement of welded joint quality.

3 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of pipes by laser welding. Laser welding comprises emitting of two laser beams along edges at open pipe upper surface. Said laser beams are transmitted via different optical fibre glass and have focused spots of diameters making over 0.3 mm. Said laser beams are emitted so that front laser beam and rear laser beam are inclined to welding direction. Note here that incidence angles are defined relative to direction perpendicular to open pipe top surface. Front laser beam falls on open pipe top surface in welding direction before rear laser beam while the letter falls on open pipe top surface in welding direction after front laser beam. Front laser beam incidence angle is set larger than that of rear laser beam. Gap between front laser beam centre and that of rear laser beam is set at open pipe rear surface equal to 1 mm and more.

EFFECT: higher quality of weld, higher yield.

17 cl, 4 dwg, 3 tbl, 1 ex

Up!