Method for welding of flat panels with header pipe
FIELD: technological processes.
SUBSTANCE: invention may be used to make welded header blocks, used, for instance in cooling systems of power transformer vessels. Panels are made with necks in the form of collars. Flat panels are assembled into blocks with their pressing to header pipe, and neck of each panel is welded to it. Neighboring panels are assembled with gap between edges of collars and are welded to header pipe by means of annular overlapping seam with provision of simultaneous fusion of two neighboring collars. After all annular seams are completed, edges of panel block neck collars are welded to header pipe by two longitudinal seams.
EFFECT: invention provides for increased efficiency and production of reliable welded seams without burn-throughs, and also makes it possible to reduce number of annular seams in narrow space between panels and to facilitate monitoring of welding process and visual inspection of overall appearance of welded seams.
The invention relates to the welding process, and in particular to methods of welding flat panels with the collector pipe, and can be applied in power in the manufacture of welded manifold blocks used, for example, in cooling systems of buildings power transformers.
Known, for example, the method of welding of flat panels in sections of two or three panels embossed with contact welding on a circle with uniform thick seam (see Ipostel, Wegmarken. "Equipment for continuous combined forming steel panel items" in the magazine "die Forging production", No. 7, 1986, p.25-27).
However, this method is difficult to perform, and when the number of flat panels that are included in the block, more than three and impossible.
Also known is the most common method of welding panels with the collector pipe, which assembles the panels with the Ref rings for the main pipe and welding necks on a path to the pipe (see, for example, techno-commercial offer of the Company "Heinrich Georg GMBH E-37116, 1983, page 1).
The disadvantages of this method is that the flat expanded metal neck panel assumes perform fillet welds on thin wall panel in the closed space between the panels with different orientation of the welding torch on the TAC welding, angular seams require high precision Assembly of panels with a minimum clearance between pipe and mouth to avoid violations of welding and related burnout wall. For manual welding of such joints in the narrow gap between the panels requires high professional skill of the welder. The use of automatic welding process perform welds in different orientation of the welding torch involves the use of fairly sophisticated tracking devices in the direction of the torch along the seam and accurate adjustment of the welding current in the welding process, depending on the spatial position of the welding torch. A failure in the welding mode or the tracking mode often leads to defects in welds and causes the need to repair defects in the seams hand-jelly, which reduces the overall performance of the production manifold blocks and buildings power transformers in General.
Increasing the production of transformers in sealed enclosures with flat hinged coolers in the form of panels connected to two collector pipes requires simplify the design of welding torches and tracking systems for the direction of the seam, as well as reducing the number of girth welds performed in a narrow space between the panes.
The technical result of the invention is to p is improving the quality of welds and simplification of the action when you receive them, increasing productivity in the production of manifold blocks.
The above effect is achieved by the fact that when welding flat panels with the collector pipe, including the preparation of flat panels by pressing them to the main pipe and welding the flanged cap to the main pipe, it is suggested collected clearance necks collars of adjacent panels to weld with a collector pipe one annular seam, and then after all of girth welds on the collector pipe, two longitudinal seams to be welded to the main pipe edge collars necks panels.
The result is, if you use panels with openings in the form of collars, the inner diameter of the semicircle which would correspond to the external diameter of the collector tube, and the edges of collars are parallel to the side planes of the panels. The height of the collar should not exceed half of the gap between the flanged openings of the panels when assembling them on the main pipe. Neck shaped collar also facilitates the Assembly of the panels in manifold blocks for welding
The inventive method of welding a flat panel with the collector pipe is depicted in figure 1, 2, 3, where
- figure 1 schematically shows a flanged neck with collar, welded to the main pipe,
- figure 2 schematically shows a part of Kollektornaya pipe in the area of welding flanged necks panels
- figure 3 shows a view along arrow a in figure 2.
The inventive method is carried out as follows. Panel 1 collected with two collector pipes 2 on a special stand, stacking piece with a gap between the edges of the collars 3 adjacent panels.
Then the collector pipe 2 to draw the collars panels on both sides and fixed manifold block in a predetermined position passed on welding.
To perform welds using welding in shielding gas with a consumable electrode in the form of a wire, or with non-consumable electrode feed filler wire into the arc zone. The welding torch when performing girth welds shall be sent in the middle of the gap between adjacent panels, while relying on the collector pipe, and welding the longitudinal seams of the leg is the collector pipe.
The optimal gap between the edges of adjacent collars is the distance 3 mm, when the reduction of the gap up to 1 mm can receive lots of incomplete penetration, but with increasing gap in excess of 3 mm to 5 mm to allow for the simultaneous fusion of the two collars with collector pipe will be required oscillation of the welding torch.
First perform all the circular seams 4, then two longitudinal weld seam 5 on one main pipe, then similar operations are performed on the other pipe alektorophobia. It is also possible to simultaneously perform welds on both the collector pipes with two torches.
The implementation of lap welds on the collector pipe with a wall substantially thicker than the thickness of the wall panels, it is much easier to perform fillet welds on thin metal, as the collector pipe prevents burn-through weld and allows the use of forced welding modes with increased welding current.
Thus the application of the proposed method of welding a flat panel with the collector pipe by welding collected with a gap necks collars of adjacent panels one annular seam, and then after all of girth welds on the collector pipe and welding the two longitudinal seams edges of collars necks panels to the main pipe, allows to increase the productivity welding in the manufacture of the collector sides and to obtain reliable welds without burn-through, eliminating the need to repair a marriage manual jelly. Reduce the number of girth welds performed in a narrow space between the panels is simplified tracking system for moving the welding torch, as the basis for the direction of the burner are the side surfaces of the adjacent panels, and forming a collector pipe is facilitated not only by the visuals which control the progress of the welding, but inspection of exterior welds.
A method of manufacturing a manifold block including an Assembly of flat panels in the blocks by pressing them to the main pipe and welded thereto, the neck of each panel, wherein the panels are done with openings in the form of collars, with adjacent panels collect with a gap between the edges of collars and are welded to the main pipe ring lap joint with overlap of fusing two adjacent collars, and after all girth welds the edges of collars manhole block panels are welded to the main pipe two longitudinal seams.
FIELD: machine building.
SUBSTANCE: invention is related to the field of welding engineering, particularly to devices for fusion welding of locking annular joints of envelopes with usage of expanding rings, and can be used in rocket-space, aviation, chemical and other industries. Installation for welding of annular joints of envelopes includes mounted on stand (1) of rotator front (2) and back posts (5) with faceplates (3, 6), welding head (11), expanding ring, consisting of moveable segments (9) with release mechanisms. On stand of rotator it is installed with ability of movement by axis of stand ring (7) with equispaced by its perimetre electromagnets (8), which can be radially moved. The number of electromagnets (8) is equal to number of segments (9) of expanding ring, which contain structural components (10) from ferromagnetic material.
EFFECT: invention provides safe working conditions at operation with expanding rings inside envelopes and increase quality of welding.
FIELD: technological processes.
SUBSTANCE: invention may be used to make welded products of box-like shape with corrugated walls, in particular transformer vessels. Sections of corrugated wall are welded to product body by means of overlapping seam, as well as corrugation bases to produce seams with periodical variable cross section. Welding speed is measured by commands from welding burner position detector with account of measurement of distance it traveled proportionally to ratio of fused seams cross section areas. When welding burner reaches corrugation base, welding speed is reduced, and after corrugation base has been welded - it is increased.
EFFECT: invention provides for higher quality of welded seam and increased efficiency with reduction of production expenses.
3 dwg, 1 ex
FIELD: technological processes.
SUBSTANCE: invention is related to method of arc welding with tungsten electrode in inertial gas medium of the first part with the first wall and end edge to the second part with the second wall and edge, besides both parts are welded to each other along joint surface between mentioned edges, along which the first wall creates a protruding angle with the second wall. Electrode is moved along mentioned surface. Electrode is placed on side of protruding angle at the angle (β) of less than 180° relative to the first wall, at the same time in case of this direction (D) electrode passes through incoming angle joined to protruding angle.
EFFECT: method is used, in particular for welding of guide spark plugs to jacket of gas turbine engine combustion chamber.
7 cl, 5 dwg
SUBSTANCE: proposed method comprises mounting and fixing the bolster on rotary mechanism followed by build-up welding in rotating the bolster. Aforesaid operations are performed at the angle of bolster rotation mechanism elevation angle varying from 8 to 12 degrees. Build-up is made by open arc with welding electrode inclined to generating line of bearing surface at 50° to 60°, while build-up interval makes 1/3 to 1/6 of saddle depth.
EFFECT: lower costs, higher quality.
1 dwg, 1 tbl
FIELD: process engineering.
SUBSTANCE: outer and inner walls are assembled to form a chamber there between. Aforesaid chamber is sealed on the side of larger diametre with the help of circular welded seam. Temporary compensator of linear displacement seals the chamber on the side of smaller diametre. One end of the compensator is welded to inner wall, while the other one is welded to outer wall. Vacuum is produced in the chamber and inert gas pressure is created, chamber is soldered and cooled. Compensator is cut off, and its cut-off site is soldered to the other RPLE chamber nozzle unit. Compensator is made from tubular workpiece in forming torus part to be deformed in die to produce nozzle outer wall so that the size between aforesaid deformed inner surfaces equal the thickness of RPLE chamber nozzle wall pack. Compensator radius part on the larger diametre side is, then cut off.
EFFECT: lower labor input, ease of manufacture, higher tightness and strength of welded seam.
FIELD: technological processes.
SUBSTANCE: invention may be used in repair of pipelines that operate at high temperatures in carbonising atmospheres. Welding is carried out with preliminary heating of up to 730…750°C. After welding, welded joint is annealed at temperature of 700…750°C for 50…70 minutes with thickness of carbonised layer of more than 1 mm to 3 mm or without annealing with thickness of carbonised layer up to 1 mm. Welding is carried out with application of pulse-arc welding method with rectangular shape of current pulses with duration of current pulse of 250…300 ms and duration of pause current of 260…310 ms.
EFFECT: quality welded joining of pipes.
2 dwg, 2 tbl, 2 ex
FIELD: technological processes.
SUBSTANCE: cut open annular sectors are previously welded with rectangular sections into continuous spiral. Spiral is installed on shaft. The first annular sector of spiral in point lying on its internal circumference is tack-welded to shaft origin. Annular sectors are distributed on shaft, starting from the first one by imparting rotary motion to shaft with permanent speed with provision of perpendicularity of spiral generatrix to shaft axis in zone of current auger vane distribution along shaft. The first one and a half turns are welded to shaft at least in three points with pitch equal to half of turn pitch, and the last turn is rigidly fixed, preventing it from longitudinal and rotary displacement. Then, after the first turn, shaft is cut at the angle α, equal to angle of spiral lift, and free part is rotated by 180°. Afterwards shaft is periodically displaced in longitudinal direction by value S of spiral turn step for further welding of previously bent segment into internal surface of every vane, and the first and last one and a half turns are welded to shaft.
EFFECT: prevention of auger jamming in operation.
2 cl, 3 dwg
SUBSTANCE: welding cage contains iron ring, in the basis of which there are installed in cases top, side and centre roll cartridges with adjuster of its movement, top pinch roller with displacement mechanism in the form of drive joint screw-nut, supporting rollers and welding unit. In area before welding on guidelines of case of each roll cartridge there are located inner roll cartridges, pivotally connected to position adjusting mechanism, each of them is mounted on detachable support, fixed on case of roll cartridge. Parallel to top pinch roller it is located additional pinch roller with its dislocation mechanism in the form of hydrocylinder. Both pinch rollers are mounted in common case.
EFFECT: improvement of welded pipes ensured by alignment registration of welded edges.
FIELD: welding jobs.
SUBSTANCE: invention relates to the method of continuous butt-welding with plasma and laser, and method of producing pipes by proposed welding method and can be used in machine building. The proposed method comprises a continuous feed of workpiece 0.1 to 0.2 mm-thick parts to be welded together, that face each other. It includes preheating of welded parts by plasmatron and irradiating them, thereafter, by laser for them to be welded together. Method of producing metal pipe comprises a continuous feed of a sheet metal band and processing the sheet workpiece to produce a round-section product. The said processing comprises preheating the seam by plasmatron and welding by laser.
EFFECT: proposed method accelerate welding rate and increase welding efficiency.
16 cl, 9 dwg
FIELD: welding jobs.
SUBSTANCE: invention relates to methods of electric arc welding and can be used for railroad rails welding together. In compliance with the proposed method, first, metal peeling and spalling points are sought for on rolling surfaces of rail joints in hardened layer. When defined, aforesaid points are abraded, the rail is measured and marked using non-destructive test techniques. The rail head is heated to, at least, 400°C and worn rail joint surfaces are subjected to resurface welding to increase the size of repaired joint. Then, joint is cooled down and mechanically processed. The said resurface welding is performed over the entire width of rail head at reverse-polarity continuous current by applying deposited bead to overlap previously deposited bead along the repaired joint perimetre, starting crosswise from the rail nonworking part.
EFFECT: welding rectilinear and curvilinear track sections, high-quality welded seam.
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.
FIELD: processes for combination type working of metals, namely welding and further plastic deforming of metal;, possibly manufacture of different-designation grids of rod materials.
SUBSTANCE: apparatus includes housing, mechanisms for feeding and moving members such as rods or wire; welding device with welding heads; control unit. Welding device includes ramp for supplying shield gas. Mechanisms for feeding and moving members are made with possibility of placing members one close to other mutually in parallel.
EFFECT: enhanced efficiency of apparatus, improved quality of structures.
5 cl, 4 dwg