Flexible metal sleeve
FIELD: technology for making metal sleeves used under conditions of high temperatures and aggressive environments, for example, in metallurgy for feeding oxygen into oxygen converter, in automobile engineering in systems for discharging exhaust gases of automobiles.
SUBSTANCE: flexible metal sleeve contains bellows mated with sleeve and metallic armor and barrel positioned coaxially on their external surface. Inside the armor on mated end of recess of corrugation of bellows cut ring is positioned. Mated rectilinear portion of corrugation of bellows is held between ring and end surface of sleeve. Ends of bellows and sleeve are connected by welded seam, made on side surface of sleeve and ring along the edge of clamped section of bellows. In particular case of realization of metal sleeve, width of cut ring is equal to width of recess of corrugation of bellows, and its thickness is equal to length of rectilinear portion of corrugation of bellows, while armor, barrel and sleeve are connected by single welded seam.
EFFECT: production of quality welded seam of bellows to flange due to prevented burn-through defects while simultaneously decreasing requirements to qualification of welder.
3 cl, 2 dwg
The invention relates to the production of metal hoses used in conditions of high temperatures and aggressive environments, for example in the steel industry to supply oxygen in an oxygen Converter, automotive systems exhaust gases of automobiles.
One of the important aspects in the design of flexible metal hose is the tightness of the connection of its elements, in particular flexible shell-bellows valves (flange, fitting and so on). The most reliable connections for tightness gives the welding elements. However, the main problem in obtaining high-quality welded joints of thin-walled shells with massive detail is overheating subtle details that may cause undesired change in the structure of the seam or the formation of burns. The prior art technical solutions aimed at obtaining a tight connection of the bellows to the valve.
For example, there is a construction site, including the bellows and the valve (flange)connected by welding with the use of technological rings, clamping the joined end of the bellows, parallel to its axis, to the side surface of the flange (see SU 1609591 A1, IPC 23 To 31/00, 30.11.1990). The welded seam is made perpendicular to the axis of the bellows and the wall at the junction. With this arrangement of the structural elements and n is the arc Board upon receipt of a welded joint is uneven heat of the welding arc, which can lead to burn-through subtle details.
You know the connection of the bellows to the valve, in which the end of the thin part is clamped between the ring and the sleeve, with a weld bead formed along the wall of the bellows and parallel to the axis of the bellows (see SU 1648665 A1, IPC 23 To 9/167, 15.05.1991). This location of the weld allows you to provide more uniform heat dissipation and to avoid burnout. However, as in the first and in the second of the solutions for the connection of the bellows sleeve is required rectilinear wall section of the bellows is quite considerable length, which requires additional operations in the process.
As the closest technical solution, taking into account the characteristics of its purpose can be considered as flexible metal hose, opened in EN 2133999 C1 IPC F 16 L 27/10, 20.07.1999 containing bellows, sostykovany with adapter, coaxial placed against the outer surface of the metal braid and a glass. However, this design does not use welding for the connection of the bellows flange that does not guarantee the tightness of the hose.
The objective of the invention is to increase the tightness and reliability of the connection elements of the conduit.
The technical result, provide a solution to this problem, is to obtain high-quality welded joint bellows is with fitting due to the exclusion of burns while reducing requirements for the qualification of welder.
This technical result is achieved due to the fact that the flexible hose containing connected to the fitting bellows and coaxially placed against the outer surface of the metal braid and a glass according to the invention, equipped with a split ring installed inside the first from the joined end of the troughs of the corrugations of the bellows, while abutting a straight line segment of the corrugations of the bellows is clamped between the ring and the end surface of the fitting, and the bellows and fittings joined by the weld seam is made on the lateral surface of the fitting and rings along the edge of the clamped section of the bellows.
In particular, if you run conduit width of the split ring is equal to the width of the troughs of the corrugations of the bellows, and its thickness is the length of the straight part of the corrugations of the bellows and the metal braid, glass, and a fitting connected to a single welded seam.
The present invention is illustrated in the accompanying graphics.
Figure 1 shows a section through the end portion of the conduit.
Figure 2 - split ring.
The hose has the following structure.
A flexible membrane in the form of bellows 1 has a cavity 2, forming corrugations are made with straight sections 3, perpendicular to the axis of the bellows. First from the joined end of the bellows cavity 2 posted by split ring 4. In affect, the, first from the joined end of the straight section 3 of the corrugations of the bellows 1 (end wall of the bellows) is placed between the split ring 4 and the end surface of the fitting 5. Weld 6 provided on the side surface of the fitting 5 and the ring 4 on the edge of the straight part 3 of the corrugations of the bellows 1. On the outer surface of the stacked bellows 1 and the fitting 5 is coaxially installed metal sheath 9 and the glass 7. Items 5, 6 and 7 are connected together on a single welded corner seam 8. All components are made of stainless steel. The wall thickness of the bellows is of the order of 0.2-0.3 mm, the Width of the split ring 4 is equal to the width of the trench 2 of the corrugations of the bellows 1, and its thickness is the length of the straight part 3 of the corrugations of the bellows 1.
The hose Assembly is as follows.
The ends of the split ring 4 is slightly diluted along its axis and "screwed" him from the first end of the cavity 2 of the bellows 1, and then connect the ends of the ring 4 and brew them. The fitting 5, the ring 4 and placed between a straight line segment 3 of the corrugations of the bellows 1 draw between a technological clamps, after which the side surface of the fitting 5 and the ring 6 along the edges of the clamped section 3 of the corrugations of the bellows 1 argon-arc welding performing a weld seam 6. The side surface of the fitting 5 and a split ring 4 pretreated with getting you blunt in the zone of the welded joint. The bellows 1 and the fitting 5 wear a wire metal braid 9 and the Cup 7, which connect with each other and with the fitting 5 TIG welding with obtaining a fillet weld 8.
The design of the conduit provides favorable conditions for high quality welding as the welding arc is directed perpendicular to the axis of the bellows along the thin end wall of the bellows, which in this case is sandwiched between two relatively massive parts (fitting and ring), which provides a symmetrical and uniform heat removal from the bellows. The possibility of burn-through of the bellows is reduced marriage tightness. In addition, it decreases the dependency of the quality of the welding on the skills and the mental and physical condition of the welder.
1. Flexible metal hose containing connected to the fitting bellows and coaxially placed against the outer surface of the metal braid and a glass, characterized in that it is provided with a split ring installed inside the first from the joined end of the troughs of the corrugations of the bellows, while abutting a straight line segment of the corrugations of the bellows is clamped between the ring and the end surface of the fitting, and the bellows and fittings joined by the weld seam is made on the lateral surface of the fitting and rings along the edge of the clamped section of the bellows.
2. The hose according to claim 1, otlichalis the same time, that the width of the split ring is equal to the width of the troughs of the corrugations of the bellows, and its thickness is the length of the straight part of the corrugations of the bellows.
3. The hose according to claim 1 or 2, characterized in that the metal braid, glass, and a fitting connected to a single welded seam.
FIELD: manufacture of high-strength laminate metallic tubes with layers of easy-to-melt metals.
SUBSTANCE: method comprises steps of feeding steel blank from heating chamber after hot rolling under pressure cylinders; winding on format drum sheet of easy-to-melt metal whose length exceeds that of hot steel sheet for forming inner protection layer of tube shell; applying onto steel sheet easy-to-melt metal sheet at temperature of steel sheet less than melting temperature of easy-to-melt metal; performing hot deforming at combined shaping by means of pressure of press-rollers for producing bimetallic strips; feeding bimetallic strips under pressure rollers of format drum for their further winding in order to produce tube shell with predetermined thickness of wall; winding on format drum easy-to-melt metal sheet with length exceeding that of all bimetallic strips for forming outer protection layer of tube shell; welding bimetallic strips one with other and with inner and outer protection layers for producing ready tube shells with use of pressure rollers on format drum rotating at melting temperature of easy-to-melt metal; joining produced shells to tube; performing said welding procedures during five revolutions of format drum. Shells are joined to tube with use of inner and outer annular welding and further final abutting due to welding steel annular members at side of outer surface of shells and butt welding by means of steel electrodes. Then easy-to-melt metal is surfaced onto welded seam.
EFFECT: enhanced strength and density of metallic tubes with non-exfoliating layers without macro-cracking and ruptures of welded joints caused by change of temperature of environment.
FIELD: rocketry, chemical engineering, aircraft engineering and other industries.
SUBSTANCE: invention relates to method of production of welded structures and it can be used at assembling, welding and sealing of round closing members, such as covers of hatches-manholes. According to invention, on inner surface of shell in area of arrangement of hatch -manhole, supporting stiffening members, such as frames or stringers, are installed. Hatch-manhole of preset size is cut out together with stiffening member. After carrying out works inside tank, inserts are welded in place of cut out part of stiffening members, and cover of hatch-manhole is installed and welded in by hermetic seam.
EFFECT: exclusion of residual welding strains and provision of required tightness of weld seam.
FIELD: manufacture of T-members of orthotropic plates used in machine engineering and in building.
SUBSTANCE: method comprises steps of placing on supporting bed of assembling stand board sheet and securing it along contour; with use of attachments mounting on said sheet in parallel to its lengthwise edges rigidity ribs; fixing one ends of rigidity ribs and mounting second ends of rigidity ribs with possibility of axial motion; applying to free ends of rigidity ribs tension effort whose stress is no more than limit yield of material of rigidity ribs; performing continuous-seam welding at side of fixed end of rigidity rib; releasing welded orthotropic plate from supporting bed of assembling stand.
EFFECT: simplified process for making orthotropic plate due to elimination of procedures for preliminary tack welding of ribs and for heat straightening of welded plate.
3 dwg, 1 tbl, 1 ex
FIELD: instrumentation engineering.
SUBSTANCE: circular passage is made in monolithic blank in form of bath where non-magnetic ring is placed; ring is preliminarily divided into equal parts which are rigidly secured and are connected by welding. Similar clearances are checked and joints are made by vacuum soldering. Non-magnetic ring magnetically divides body over perimeter of conical surface into two parts forming equal areas of surface; side walls of non-magnetic material are located orthogonally relative to this surface. Proposed method ensures enhanced reliability of connection of two parts of electromagnetic valve body by vacuum soldering through non-magnetic ring, thus providing for electromagnetic isolation for enhancing magnetic action on armature.
EFFECT: enhanced reliability; reduced usage of metal.
2 cl, 3 dwg
FIELD: electron-beam welding of tubes, possibly manufacture of ducts of nuclear reactors by welding tubes of zirconium and titanium.
SUBSTANCE: on lateral surface of end portion of one tube annular protrusion is formed with cross section in the form of isosceles triangle; apex of one angle of base of said triangle is arranged on outer edge of tube. End of tube at said side of tube is tapered inside tube till inner edge of tube end which is shifted by turning in lathe along axis of tube inside tube from tube end by value equal to half of protrusion base. End of other tube is tapered outside tube till inner edge shifted outside by the same value. Then tube butts are joined, and for one revolution of butt additive protrusion and tube ends are simultaneously fused by means of concentrated laser beam.
EFFECT: lowered cost of electron beam welding of thick wall tubes as additive wire and device for feeding it to welded seam zone are not used, improved strength and corrosion resistance of welded joint.
2 cl, 1 ex, 1 dwg
FIELD: plastic working of metals, namely processes for forming butt welded seams on tubes at making tube studs of U-shaped tube bundles using effect of localized hot plastic deforming of welded seam and near-seam zones.
SUBSTANCE: method comprises steps of preliminarily working tube ends by expanding them from cylinder to cylinder; assembling tubes with use of mandrel and placing intermediate member of additive material between joined end surfaces of end portions of tubes sized by expansion and end surfaces of step ring. Welded seams are formed by argon-arc welding due to melting material of intermediate member at its both sides adjacent to tube ends. The intermediate member is heated up and it is subjected to hot radial squeezing while concentrating its initial deformation in surface layers according to position of ring steps, welded seams and near-seam zones on mandrel for providing size of their outer diameter equal to initial outer diameter of tubes.
EFFECT: improved quality of welded seams.
FIELD: mechanical engineering; pipeline welded joints.
SUBSTANCE: invention relates to pipelines used in pumping of liquid and gaseous media. Method comes to choosing to choosing of type of welded joint, preparation of edges of metal pipes to be connected by welding, application of protective coating to inner surface of pipes, placing of sealing members, heat insulating and sealing layers on outer surface of sleeve to be installed inside pipes, fitting said sleeve inside pipes and welding. Protective coating is applied to inner surface of pipes at a distance from end faces to form area free from heat stresses in zone of application. Sleeve is made cylindrical, and its butt-end zones are expanded to form conical sections. At least three-L-shaped stops are rigidly fixed on outer surface of sleeve, said stops being equally spaced in radial plane, or L-shaped ring stop. Ring members are rigidly secured on outer surface of cylindrical section of sleeve opposite to each other with equal displacement from end faces. Ring nonreinforced and/or reinforced rubber seals are used as sealing members. Protective coating is applied to inner surfaces of cylindrical and conical sections of sleeve. Heat insulating layer is rigidly secured on outer surface of cylindrical section of sleeve between end faces of ring members, and sealing layer is applied to outer surfaces of conical sections of sleeve. Sleeve is installed inside pipes to provide contact between edges of pipes and L-shaped stops or L-shaped ring stop for tight contact between ring nonreinforced and/or reinforced rubber seals, protective coating applied to inner surface of pipes, and faces of ring members and conical sections of sleeve. Welding is carried out by hand and/or automatic method with provision of weld zone whose area exceeds area of normal sections of welded pipes. Welding done, joint is cooled to ambient temperature.
EFFECT: provision of long service of pipelines owing to protection of inner surface of weld from aggressive media.
1 ex, 1 dwg
FIELD: mechanical engineering; pipeline welded joints.
SUBSTANCE: proposed unit contains metal pipes with protective coating applied to their inner surface, sleeve placed inside pipes, ring members, ring nonreinforced and/or reinforced rubber seals, heat insulating material, sealing material, at least three-L-shaped stops uniformly spaced in radial plane or L-shaped ring stop serving for setting centers of masses. L-shaped stops or L-shaped ring stop are arranged on half of sleeve length and are rigidly fixed on its outer surface. Sleeve is provided with cylindrical section and conical sections mating with cylindrical section, expanded and/or mechanically treated by cutting-edge tool. Sleeve is arranged inside pipes so that edges of pipes are in contact with L-shaped stops or L-shaped ring stop. Protective coating is applied to inner surface of pipes at a distance from their end faces to form zone in area of application free from heat stresses. Protective coating is applied also to inner surface of sleeve. Ring members are rigidly secured on outer surface of cylindrical section of sleeve being equally displaced from its end faces. Ring nonreinforced and/or reinforced rubber seals are arranged on outer surface of sleeve between protective coating applied to inner surface of pipes, end faces of ring members and conical sections of sleeve, being held in tight contact with them. Heat insulating material is rigidly secured on outer surface of cylindrical section of sleeve between end faces of ring members, and sealing material is applied to outer surface of sleeve conical sections. Unit is formed by hand and/or automatic welding to get weld joint whose area exceeds area of normal section of pipes.
EFFECT: provision of long service life pipelines owing to protection of inner surface of weld from aggressive media.
1 ex, 1 dwg
FIELD: mechanical engineering and metalworking; methods of manufacture of cold strain dies.
SUBSTANCE: proposed method includes welding-on the welding material on working section of die of the following chemical composition: C, 0.5-1.5%; Si, 0.2-2.0%; Mn, 0.3-6.0%; Cr, 0.3-10%; Co, 0.3-10%; V, 0.3-2.0%; Mo, 5.0-10.0%, unavoidable admixtures; the remainder being Fe. Welded-on metal is cooled down at rate above critical rate of hardening in temperature interval of Ar1-600°C. Welded-on working part is subjected to machining for obtaining required geometry and to treatment by cold of welded-on metal. After machining and treatment by cold, welded-on metal is tempered at temperature of 480-520°C ensuring separation of dispersed carbides and intermetallic compounds without coagulation.
EFFECT: enhanced hardness of working part of die; enhanced reliability; increased productivity.
2 cl, 4 dwg, 3 tbl
FIELD: mechanical engineering; plastic metal working.
SUBSTANCE: invention relates to forming of butt welds on pipes, at production of pipe studs and U-shaped bundles using localized hot plastic deformation of weld and adjoining near-weld zones. Preparatory operations are carried out on pipes 1 to be connected. Pipes are assembled with provision of contact at end faces. Intermediate member 2 in form of bushing made of filler material is arranged on outer surface of assembled pipes symmetrically relative to butt. Radial compression force is applied to outer surface of bushing to form contact residual stresses between members to be connected. Bushing material and pipe material are welded to each other. Hot butt is subjected to radial upsetting in mandrel to finally form inner surface of butt joint by mandrelling.
EFFECT: provision of quality butt weld without defects and near-weld zone of required structure and mechanical properties.
FIELD: processes for welding tube butts at making pipelines, possibly erection of main and plant pipelines of large diameters, with thick and thin walls, mainly in oil and gas production, missile making industry branches.
SUBSTANCE: method comprises steps of dressing welded tubes edges and blunting them; assembling tubes and centering them; before welding heating up tube end portion along length equal approximately to 50 mm for tube made with negative allowance until equalizing diameter of said portion and diameter of tube made with positive allowance; realizing heating by means of heater arranged on end of tube made with negative allowance; performing electric-contact or electric-arc welding of butts of tubes.
EFFECT: high-quality welded joints of pipelines due to increased strength of welded seam, enhanced efficiency of welding-mounting operations due to elimination of procedure for selecting tubes with the same diameters of their end portions made according to standard allowances for their diameters.
3 cl, 4 dwg, 1 ex
FIELD: building industry branch, namely assembling tubes for welding at constructing pipelines.
SUBSTANCE: method comprises steps of measuring geometry parameters of end of each tube to be butt joined; analyzing combination of tubes in butt joint during two stages; at first stage determining values of assembling parameters for large number of mutual position of tube ends along the whole perimeter of butt; at second stage selecting of all possible positions of tube ends such position for which target function including values of assembling parameters determined for first stage has extreme value. It allows to take into account real geometry of end of each tube at assembling, to preliminarily analyze main parameters of assembled butt joint and to select most optimal variant of mutual arrangement of tubes on base of analysis before assembling.
EFFECT: enhanced assembling accuracy, improved quality of welded tube joint, shortened time period for finding most optimal mutual arrangement of tubes for assembling.
8 cl, 13 dwg, 1 ex
FIELD: mechanical engineering; welding.
SUBSTANCE: invention relates to welding facilities designed for welding nonturnable butt joints of small diameter pipes. Proposed device has split housing, chuck plate 3 with outer gear rim carrying welding torch 5 with electrode 7 and nozzle to feed shielding gas 6, and worm drive 8. Split housing consists of two parts, movable part 2 and fixed part 1. Movable part is loaded by spring 12 and is installed for turning around axle 15 relative to fixed one. Split of housing coincides in plane with split of chuck plate, and worm drive is coupled with gear rim 4 of chuck plate by means of intermediate gear wheel 10 installed on axle in fixed part of housing. Jet 11 is installed at side of chuck plate opposite to welding torch on one axis with check plate. Thanks to it quality of weld is improved owing to creating closed working zone at welding, provision of gauge pressure of shielding gas and directed movement of shielding gas from nozzle to jet.
EFFECT: reduced mounting space required for fitting device on pipes to be welded.
3 cl, 3 dwg
FIELD: electric arc welding, namely welding of angular seams of T-joints.
SUBSTANCE: method comprises steps of making welded seam along crossing line of lengthwise axial plane of web with adjacent surface of flange; directing electrode onto web at inclination angle 30-40° over flange higher than flange by value consisting 0.3 - 0.5 of web thickness; providing crossing of electrode axis and lengthwise axis of cross section of web in point laid on adjacent surface of flange.
EFFECT: lowered labor consumption of welding process due to absence of operations for edge preparation before welding and air-electric arc planing of back side of seam.
1 dwg, 1 tbl
FIELD: processes for welding reinforcing constructional member with main pipeline under pressure.
SUBSTANCE: method comprises steps of making constructional member 2 of two parts; placing it onto cleaned portion of pipeline 1; mutually welding them by lengthwise seams without electric arc touching of pipeline wall; placing at both sides of constructional members technological rings 3 spaced from member by predetermined distance and having two halves joined by lengthwise seams; welding constructional member 2 with technological rings 3 at forming lap-butt joints after preliminarily dressing end surfaces for chamfering edges; placing constructional member 2 on cleaned portion of pipeline 1 at gap no more than 0.5 mm; forming cavity in inner surface of ends of welded constructional member 2 and technological rings 3 by inversely chamfering by depth 1.0 - 1.5 mm and angle 30 - 45°; at welding partially filling formed cavity with melt metal.
EFFECT: enhanced quality and reliability of welded joints of slit type constructional members and main pipeline.
1 tbl, 1 ex
FIELD: atomic-power engineering; metallurgy; production of equipment for atomic reactors and crystallizers for continuously steel casting.
SUBSTANCE: the invention may be used at production of heat-exchange plates of toroidal chambers with a magnetic field, heat exchangers for atomic reactors, crystallizers for continuously steel casting. In a longitudinal water-cooling channel insert a pipe. The wall of the pipe inserted in the water-cooling channel is previously crimped by a spirally located crimp. Fill the clearance formed between the inner surface of the water-cooling channel and the outer surface of the pipe with a melted soldering alloy. After filling-up of the clearance with the melted soldering alloy but prior to the beginning of its crystallization expand the internal cavity of the corrugated pipe by a piercer. The direction of a turn of a corrugation can coincide with a direction of movement of the piercer. The method ensures removal of the gas pores from the melted soldering alloy and an increase of a heat flux density on surfaces of the interface between the outer side of the water-cooled pipe and the surface of the plate-cooler during its operation.
EFFECT: the invention ensures removal of the gas pores from the melted soldering alloy, an increase of a heat flux density on surfaces of the interface between the outer side of a water-cooled pipe and the surface of the plate-cooler during its operation.
2 cl, 2 dwg
FIELD: electric arc welding processes, mainly manual electric arc welding of railway road rails.
SUBSTANCE: method comprises steps of placing rails with gap between their welded edges; introducing in gap consumable electrode and welding rails with use of forms mounted near welding zone at electric current intensity sufficient for creating liquid bath in the whole volume of gap; preliminarily mechanically working edges of rails or edge of one rail by cross cutting of rail in vertical plane from rail head till beginning of rail flange; horizontally cutting end face of rail normally to previous cut; chamfering end face of rail at rounding it near base of rail flange. At formation of liquid bath in root of seam, edges of base metal of rails are additionally melted.
EFFECT: improved mechanical properties of welded seam similar to those of base metal, increased useful life period of rails.
2 dwg, 1 ex
FIELD: processes for pressure welding of metallic lead wires, possibly at making power semiconductor devices.
SUBSTANCE: method comprises steps of applying initial pressure to parts; at action of initial pressure upon Y-shaped electrode ultrasonic oscillations are applied in addition; heating parts by means of V-shaped electrode; then applying additional pressure while decreasing amplitude of said oscillations till zero. Invention provides lowered pressure at welding leads on chip and increased contact area of joined surfaces.
EFFECT: enhanced operational reliability of powerful semiconductor devices, improved efficiency of method due to shortened time period for forming welded joints.