Method of contact spot welding of rivet with plate of titanium alloys

FIELD: technological processes.

SUBSTANCE: opening with diameter of D0=(1.05-1.2)d is made in plate, where d- diameter of rivet rod. In top electrode insulating bushing is installed with external diameter of D1=(1.7-2.5)d, in which rivet rod is loosely fit. From the side of rivet head electrode is installed with flat working surface. Value of pulse current is set as equal to value of pulse at welding of packet from two sheets with the thickness of every one equal to the thickness of plate, with duration of pulse of 0.18-0.25 from duration of pulse during welding of package from sheets.

EFFECT: as a result, high quality joint is produced with high strength characteristics.

1 tbl, 7 dwg

 

The invention relates to the field of technology resistance spot welding and can be used in the manufacture of plate parts Osipovna.

There is a method of resistance spot welding rivets with plate (see Kochergin K.A. welding. - Leningrad: Mashinostroenie, Leningrad branch, 1987. - 240 S. Il. P.109, RIS). With this method of resistance welding in the upper electrode contact machines are doing the hole in which the rod set rivet. Regulate the height of the protrusion of the rivet head relative to the working surface of the upper electrode. Side plate place the electrode with a flat working surface. Then the electrodes are brought together to touch the rivet head surface plate, let the impulse of welding current and include upsetting effort.

Due to the current flow is heated parts in the contact zone of the rivet head with a plate formed of the liquid metal interlayer, crystallization of which is formed the connection.

The disadvantage of this method of welding rivet plate is the frequent formation of splash when forming compounds. This reduces the quality of the connection, which is unacceptable in the manufacture of critical parts, such as bushings mounting the radio waves of the cone of the aircraft from composite mother is La. In addition, the implementation of this method requires an additional device for the exact positioning of the rivet relative to each other (persistence step welding rivets).

The closest to the technical nature of the claimed method is a method of resistance welding rivets with countersunk head plate (Technology and equipment of welding. The tutorial. Edited by Orlov, D. - M.: Mashinostroenie, 1975. 536 S. Il. Page 172, RISS). With this method in the plate perform the hole, which creates a variant of the contact "sharp side". The high current density supported by the small area of contact between the sharp edges of the hole with an inclined surface of the rivet head.

The disadvantage of the prototype is the formation of compounds without the formation of liquid phase, which makes it not controlprogram. In addition, this variant form of connection is characterized by a great variation of strength (breaking stress).

The proposed method of contact welding rivets with plate ensures the formation of a liquid phase in the contact between the rivet and the plate and, as a consequence, stabilization of the strength properties of the obtained compounds.

The technical result, which directed this invention, is provided by performing in the plate hole the participation of diameter D o=(1,05-1,2)d, where d is the diameter of the shank of the rivet locations in the upper electrode insulating sleeve with an outer diameter of D1=(1,7-2,5)d, the position of the side plate electrode with a flat work surface, with the magnitude of the current pulse is set equal to the magnitude of the impulse welding package of two sheets, the total thickness is equal to the thickness of the plate, when the pulse width of 0.18 to 0.25 from pulse welding package of two sheets.

Read more the essence of the proposed method is illustrated by drawings:

1 shows a diagram of the Assembly of the rivet connection plate for welding in accordance with the inventive method;

figure 2 presents the microcracks on the surface of the rivet when forming connections with the diameter of the hole in the plate 1 less than 1,05d;

figure 3 presents the macrostructure of the connection diameter of the holes in the plate 1 over 1,2d;

figure 4 shows a diagram of the flow of welding current in the pulse period;

figure 5 presents the macrostructure connection with pulse duration less than 0.18 from pulse welding package of two sheets;

figure 6 presents the macrostructure connection with pulse duration from 0.25 pulse welding package of two sheets;

7 showing the macrostructure of the rivet connection with a plate of the Plava VTS, obtained in accordance with the inventive method to the optimal mode.

The proposed method of contact welding rivets with a plate of titanium alloys is carried out as follows. In plate 1 (figure 1) is a through hole with a diameter of Do=(1,05-1,2)d, where d is the diameter of the shank of the rivet 2. From the side of the rivet head 2 has the electrode 3 with a flat working surface. Rod side of the rivet 2 have upper electrode 4, which has an insulating sleeve 5. The inner diameter of the sleeve 5 is selected based on the installation software of the terminal rivet 2 in the sleeve on the free landing. The external diameter of the sleeve 5 is set by the ratio of D1=(1,7-2,5)d.

When the diameter of the hole in the plate is less than 1,05d is the contact edges of the hole with the rivet body 2 at the time of filing of the upsetting. In this part of the welding current passes from the electrode 4 through the plate 1 in the body of the rivet 2 and the electrode 3. As in this case, increasing the contact area between the plate 1 and the rivet 2, there is a decrease in current density and intensity of heating of the plate 1 in the connection zone. At upsetting the rivet 2 is pressed in enough of the heated metal plate, which causes the formation of micro-cracks on its surface (figure 2).

When the diameter of the hole in the plate more than 1,2d welding process has the t to a deep indentation of the rivet head 2 in the plate 1 with the formation of dents on the part of the rivet head and the bucket rod side of the rivet (3). Therefore, the optimum range of diameters of the holes in the plate 1 Do=(1,05-1,2)d, where d is the diameter of the shank of the rivet 2.

On the formation of connections in addition to the magnitude of the current pulse is greatly influenced by the external diameter of D1insulating sleeve 5 in the electrode 4. When the outer diameter D1less than 1,7d there is a small length of the zone of heating of the metal plate 1 near the hole. This causes great efforts during indentation of the rivet head in the plate 1. The molding compound becomes unstable and marked protrusion of the rivet head above the surface of the plate.

When the outer diameter D1more than 2,5d in the formation of seals observed deformation in the form of a trough in the welding zone plate 1 rivet 2 due to the low rigidity of the insulating sleeve 5 in the upper electrode 4.

Therefore, the optimal is the outer diameter of the insulating sleeve in the range of D1=(1,7-2,5)d, which provides the necessary heating of the plate 1 near holes and no residual deformation of the plate 1 in the connection zone after welding. The flow of current in this case is in the process of heating the compound shown by the arrows in figure 4.

The magnitude of the current pulse, which determines the temperature of the heating plate 1 and rivets 2 in the welding process, set equal to the current value when SV is the REC package of two sheets, the total thickness equal to the thickness of the plate. A more subtle regulation of the heat input into the connecting parts are produced by varying the pulse duration. The duration of the current pulse less, 0,18 from pulse welding package of two sheets, there is uneven heating of the plate 1 by the thickness and lack of education of the liquid core (figure 5). At pulse duration of more than 0.25 from the pulse current when welding package of two sheets with a total thickness equal to the thickness of the plate, there is excessive heating of the connected parts and the formation of a solid nucleus in the head of the rivet (6). This reduces the mechanical properties of the connection.

When the pulse width, 2.0-2.5 times greater than the duration of the current pulse welding package of two plates, there is the formation of a liquid ring core (7), providing the required strength of the connection.

Experiments were carried out by resistance welding plates of alloy VTS thickness of 2 mm rivet, alloy W 16 with a diameter of 2.5 mm Rivet had countersunk head. The length of the rivet head was 7 mm Before welding in a plate and carried out the hole diameter is varied in the range of 2.50-3,25 mm

For welding rivets with plate has been used machine for resistance spot welding brand MT-2023, virginialottery which was inserted sleeve from caprolactone. The external diameter of the sleeve was changed in the range of 4-6,5 mm. Internal diameter of the sleeve was 2.5+0.1 mm for the free occurrences of the stem of the rivet into the sleeve.

As welding mode mode has been selected for the formation of the welding spot diameter of 6.9-7.1 mm at the connection package of two sheets of alloy VTS thickness of 2+2 mm: the current pulse from 9.0 to 9.2 kA, pulse duration of 0.32, the compressing force of the electrodes 4,4-4,9 kN.

The results are shown in the table.

2,5
No. p.pThe diameter of the hole in the plate DoThe outer diameter of the insulating sleeve D1The current pulse, kAThe gain compression of the electrodes, HPulse width,Peculiarities of formation of connectionsDestructive force, kN
n·dmmn·dmm
112,52,1the 5.259,13,20,07 The formation of cracks on the body of the rivet-
21,052,632,1the 5.25No cracks on the body of the rivet and forming connections flush with the plate surface-
31,12,752,1the 5.25
41,23,02,1the 5.25
51,33,252,1the 5.25The formation of dents in the plate by the rivet head-
61,12,751,64,09,13,20,07A small length of the zone of the heating plates and a large force compression of electrodes for forming connections-
71,12,751,74,25Does not require increasing the compression force of the electrodes when forming connections and no deformation of the plate in the connection zone-
81,12,752,1the 5.25
91,12,756,25
101,12,752,66,5The deflection of the plate due to the low stiffness of the upper electrode in the connection zone-
111,12,752,1the 5.250,05Molten core is missing or is present in some parts of the contact plate with rivet.5,5-6,4
121,12,752,1the 5.250,06Molten core is present throughout14,1 and 15.3
131,12,752,1the 5.259,13,20,77the surface of the rivet head on the perimeter of its contact with the plateof 15.5 and 16.2
141,12,752,1the 5.250,08The increase in the size of the cast core connection15,2-16,1
151,12,752,1the 5.250,10The formation of a solid nucleus in the head of the rivet and the reduction ol chestnykh characteristics of connections of 10.4 to 11.3

This shows that using the proposed method resistance spot welding rivets with a plate of titanium alloy provides a high quality connection with high strength properties. Application of the method is possible in the manufacture of needle bushing mounting radiotransparent cone made of composite material to the forward fuselage of the aircraft.

The method of resistance spot welding rivets with countersunk head with a plate of titanium alloys, in which the plate perform a through hole, into the hole installing rivet, the assembled connection feature between the electrodes contact the car, then through the electrodes pass a current pulse and implement draught, characterized in that the hole in the plate do with a diameter of Do=(1,05-1,2)d, where d is the diameter of the shank of the rivet, the upper electrode installing insulating sleeve with an outer diameter of D1=(1,7-2,5)d, which have a free landing rod rivet, side head rivet set the electrode with a flat working surface, and the magnitude of the current pulse is set equal to the magnitude of the impulse welding package of two sheets with the thickness of each equal to the thickness of the plate, and the pulse duration - (0,18-0,25) from long is eljnosti pulse welding package of sheets.



 

Same patents:

FIELD: technological processes.

SUBSTANCE: invention is related to method of electron-emitting welding of thin-walled pipe with wall thickness of less than 1.5 mm with thin-walled bimetallic connector and may be applied for production of crucial items for nuclear reactor core from zirconium alloys and stainless steel of grade X18H10T. Prior to welding welded end of thin-walled pipe is rolled as cone of not more than 14°, and aligning ring bulge is arranged in its end. Welded end of bimetallic connector is shaped as cone in a similar manner and aligning ring groove is arranged in its butt-end for ring bulge at pipe butt-end. After that split retaining rings are installed on welded ends of pipe and connector at the distance from butt-ends of not more than 5 mm. Welding is made with heating spot of electron beam with diameter of not more than 0.5 of thickness of pipe welded wall with welding speed of not more than 20 m/hour. Heat spot of electron beam is oscillated with frequency of not more than 50 oscillations per second symmetrically to line of joint by trajectory of semi-ellipse with length of small axis not more than thickness of pipe welded wall thickness.

EFFECT: high quality welded joints.

3 cl, 5 dwg, 1 ex

FIELD: instrument making.

SUBSTANCE: invention relates to techniques associated with preparation for assembly and assembly proper for welding thin-wall pipes and a bimetal adapter used in the reactor fuel core. The pipe and the adapter are fitted in split ring shrouds allowing the pipe and shroud ends to extend beyond the shroud boundaries. The thin-wall pipe end gets flared from inside to make a taper with an angle not exceeding 15°. The adapter to be jointed is shaped similarly. On the adapter end face a circular inner groove is made, its depth not exceeding the wall thickness, while, on the pipe end face, a circular flange is made with its outer diameter equal to inner diameter of the adapter circular groove. The pipe and adapter end faces to be welded together are fixed as-assembled using an internal tightening device.

EFFECT: accurate alignment in assembly for welding is ensured along with preservation of cylindrical form of jointed parts after welding.

2 cl, 8 dwg

FIELD: metallurgy.

SUBSTANCE: body of the product is formed. The area surrounding the defect is removed, including the defect that occurred on the processed product body surface during forming, making a recess in the processed surface. Deposits from the depositing tool (electrode) formed by pressing powder consisting of essentially of the product body metal are settled filling the recessed area. Processing is performed in an electrospark discharge machine.

EFFECT: eliminates thermal deformation at periphery of recessed area; increases metallic product manufacture quality.

17 cl, 21 dwg

FIELD: mechanical engineering; welding of rails.

SUBSTANCE: cross cut along vertical plane from head of rail to beginning of rail foot is made on edges of rails 1 and 2 or on edge of one of rails. Horizontal cut is made along end face surface of rails or rail square to previously made cut, and chamber at angle of 45° is made on end face surface of foot to form root face 3 at base of foot. Rails are installed at require technological clearance 4. Welding wire is fitted into clearance together with insulated end tip of electrode holder of semiautomatic welder. Electric arc welding is carried out continuously over entire height of rail with use of side forming crystallizers-straps in zone of welding out welding current providing formation of liquid bath over entire space of technological clearance. Liquid bath in root of weld is obtained owing to melting of edges of rail main metal.

EFFECT: improved mechanical properties of weld and increased welding rate, facilitated welding.

2 dwg

FIELD: mechanical engineering; argon-arc welding.

SUBSTANCE: invention relates to methods of automatic argon-arc welding of austenitic steel pipes in manufacture of important constructions, such as high-pressure pipes used at nuclear power stations. Proposed method includes mechanical preparation of welding surface zone, veeing edges to miter of 3.0-3.5 mm and subsequent multiple-pass welding with nonconsumable negative electrode using filler wire. Welding edges are veed to miter of 2.7-3.0 mm. Welding at first pass is carried out with heat input of 0.35-0.55 MJ/m by impulse current. Welding at second pass is done with heat input of 0.6-0.86 MJ/m by impulse current at cross oscillations of electrode. Welding at third and subsequent passes is carried out with heat input of 0.62-1.16 MJ/m by steady current with cross oscillations of electrode.

EFFECT: increased capacity art welding and quality of weld joint owing to reduction of intercrystalline cracking of weld joint.

2 tbl

FIELD: welding processes and equipment, namely methods for protecting inner surface of welded seam of parts having inner multi-layer protection coating with fragile layers against corrosion action of aggressive medium.

SUBSTANCE: method comprises steps of forming beads 3 on portions of surface of parts 1, 2 without coating; assembling parts according to beads and welding with use of single heating source; applying multi-layer coating; before applying coating forming protrusions 4 on shaped beads and forming cavity 7 under them; at assembling providing touching along surfaces 8 of said protrusions for further welding; forming portion of bead surface under protrusions without inner layer of coating; filling part of cavity between protrusions and end of inner layer of coating with material of outer layer or layers 6; providing thickness of protrusion no less than total thickness of inner and outer layers of coating; using as outer layer or layers of coating material thermally softening at high temperatures during welding process.

EFFECT: improved operational reliability, enhanced protection of parts having inner protection coating with fragile layers.

4 dwg

FIELD: processes for welding thick-wall tubes without using additives, namely method for preparing tube edges for electron-beam welding.

SUBSTANCE: end of one of welded tubes is faced by means of cutter by angle 90° relative to its axis. End of other tube is worked by angle 90° relative to its axis inside tube and in upper portion of worked end annular protrusion is remained. Thickness and length values of said protrusion are no more than 4 mm. Technological groove is formed by means of cutter under said annular protrusion; depth and width of said groove are no more than 1 mm. With use of rolling out roller annular protrusion is bent outside by angle 45 - 90° relative to tube axis. Bent protrusion is turned for imparting to its cross section shape of isosceles triangle or isosceles trapezium or rectangle for forming protruded additive. In end of tube under protruded additive cylindrical cavity is turned with inner diameter equal to outer diameter of end of first tube. Said cavity is turned by depth equal to half of base of cross section of protruded additive.

EFFECT: simplified, reduced-cost process for assembling tubes for welding due to automatic centering of tubes at assembling.

3 cl, 6 dwg, 1 ex

FIELD: building, repairing main pipelines for transporting liquids and gases, namely restoration of such pipelines by changing defective portion.

SUBSTANCE: method comprises steps of marking out and trimming ends of repairing "reel" and tube ends for providing coincidence of their edges; marking out tube end portions according to ends of false tube having telescopically changed length. Initially false tube in compressed state is mounted between tube ends and then it is put onto tubes without gap between inner surface of false tube and outer surfaces of tube end portions. Length of repairing "reel" is determined according to length of false tube after mounting the last on end portions of tubes.

EFFECT: enhanced accuracy of marking out tube butts and repairing reel, simplified marking out process, lowered labor consumption of marking out and mounting operations.

1 dwg

FIELD: procedures for joining parts by welding due to surfacing additive metal.

SUBSTANCE: method for joining parts by welding comprises steps of performing first pass for surfacing part joining layer and at least second pass for surfacing joint filling layer; just before second pass flush-cutting thickened portion formed at back side of joining layer and extending outside joined parts. It provides possibility for limiting plastic deformations in zone of welded seam promoting relaxation of inner mechanical stresses.

EFFECT: possibility for relaxing residual inner mechanical stresses.

2 cl, 4 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: technological processes.

SUBSTANCE: spacer grid is assembled and crimped during all welding process. Electrodes are moved into working position by robot; position adjustment is performed during movement. Then distance between edge cells of the grid in each direction is calculated, after that, an average distance between cells in each direction is determined, using the following formula: Sdir={Sprog·Ldir)/Lprog, where Sdir is average distance between welded grid cells, in millimeters; Sprog - distance between grid cells, set by robot programme, in millimeters; Ldir - distance between edge cells in the grid, in millimeters; Lprog - distance between edge cells of the grid, set by robot programme. Then coordinates of grid cells in the robot programme are adjusted. After that, electrodes are moved into working position, and robot drive is switched off. Welding is performed by electrode squeezing supply of welding impulse row by row in each direction of the grid in accordance with robot programme. Grid cells, located in the places of guide channels, are skipped.

EFFECT: invention decreases possibility of process-induced distortions, increases performance of the system, as well as robot lifetime.

4 dwg

FIELD: physics.

SUBSTANCE: invention relates to nuclear power, in particular, to production of power reactor fuel element spacer lattice using a robot module for resistance spot welding. The module incorporates a welding machine, an industrial robot with tongs fitted on the robot arm and fixing the electrodes, a control system, a table accommodating an attachment device for spacer lattice to be welded, the said device being made in the form of multi-jaw chuck with jaws enveloping the lattice perimeter. The chuck is provided with a platform with a blind hole to receive a sleeve. The hole depth corresponds to the size the sleeve extends by relative to the lattice cell. The said platform incorporates the spacer lattice locks, spacer lattice reference point and a spring-loaded bar. The locks allow their arrangement in the lattice cells. The reference point allows its arrangement in one of the spacer lattice channel holes. The bar is fixed on the platform and can move towards the sleeve. There are base elements arranged on the bar face to enter the sleeve slot.

EFFECT: performances of the module are widened thanks to an accurate positioning of the sleeve relative to the lattice with the subsequent welding both together.

3 dwg

FIELD: physics.

SUBSTANCE: grid field is assembled. During whole welding process it is swaged. Junction points of welding surfaces are detected. Electrodes coordinates and their motion paths during replacement are adjusted. Welding process is carried out by spot welding for every line with missing cells guide channel passing. Wear of electrodes active faces is controlled. During electrodes coordinate adjustment welding spots coordinates slip is evaluated. After welding spots are fixed change in welding spots slip referring to contact coordinate is detected and wear of electrode active faces is evaluated. Evaluated wear of electrode active face is compared to maximum permissible wear level. If wear of electrode active faces is more than maximum permissible wear level welding process is stopped and electrodes are replaced.

EFFECT: automation and quality of welding process are improved.

4 dwg

FIELD: mechanical engineering; welding.

SUBSTANCE: invention relates to resistance spot welding device for manufacture of spacer grids of nuclear reactor fuel assemblies. Provides robot module includes welding machine, industrial robot with welding gun with electrodes installed on robot arm, control system and tables with device for fastening spacer grid to be welded. Device for fastening spacer grid to be welded is made in from of multijaw chuck with jaws enclosing perimeter of said grid. Electrodes of welding guns have spherical working surface and they are provided with cylindrical connecting element. Said connecting element is arranged in electrode holder at angle to perpendicular drawn to welded surfaces. Multijaw chuck is provided with platform with reduced height sections. Slots are made on jaws enclosing perimeter of spacer grid.

EFFECT: simplified design of electrodes and method of their fastening, increased service life of electrodes.

5 dwg

FIELD: apparatuses for contact welding of laminate panels with corrugated filler.

SUBSTANCE: apparatus includes housing in which upper and lower electrodes and mechanism for tightening welded assembly are mounted. Said mechanism includes two detachable portions mutually joined by angle less than friction angle of material of joined parts.

EFFECT: improved reliability of welded seam of facing and filler.

2 dwg

FIELD: apparatuses for contact welding of laminate panels with corrugated filler.

SUBSTANCE: apparatus includes mechanism for drawing in pack of welded parts. Said mechanism includes two detachable portions with grooves forming cavity. In cavity restricted by said grooves elastic envelope is arranged. Said envelope is communicated with pressure source.

EFFECT: enhanced reliability of welded seam of facing and filler.

2 dwg

FIELD: apparatuses for producing gauzes, mainly of low carbon wire.

SUBSTANCE: line includes successively mounted coil holders with coils whose number is equal to maximum number of longitudinal wires of gauze; apparatus for feeding longitudinal wire having guiding devices, straightening mechanism; machine for multi-spot contact welding; apparatus for stepwise feed of longitudinal wire, lower electrode unit, apparatus for feeding cross wire, all arranged on housing of welding machine. Upper shunting electrodes are mounted in upper rocking beam. Line also includes guillotine shears for chopping wire, packaging device and control system.

EFFECT: enhanced quality of wire gauze, simplified design and enlarged functional possibilities of line.

3 cl, 17 dwg

FIELD: resistance welding of metal with high heat conductivity such as copper, aluminum, their alloys and metals with coating on base of such metals.

SUBSTANCE: metallic layer of powdered self-fluxing chrome-nickel alloy with high electric resistance (kind of alloy is given in description of invention) and with total content of nickel and chrome 70 - 80%; C, Si, Mn, B, Fe - the balance. Such powdered alloy is applied by thickness no more than 0.3 mm onto surface of welded part. During welding melt metal of such layer is displaced by action of axial loads onto periphery of spot formed by welding.

EFFECT: enhanced operational reliability, improved quality of welded joint, enlarged manufacturing possibilities of welding.

2 cl, 3 ex

FIELD: mechanical engineering; welding.

SUBSTANCE: invention relates to welding and it can be used in manufacture of structural members of materials featuring high plastic properties in zones of temperatures of recrystallization, particularly, in manufacture of frame members of heat liberating assemblies of nuclear reactors manufactured of zirconium alloys. Proposed method of resistance welding with simultaneously putting two weld spots of mainly coaxially arranged parts, includes compression of parts and heating of welding zone with electric current at partial shunting. Compression is done with forming of line of contact along generatrices of parts. Heating is carried out first with forming of zone of higher plasticity along line of contact of parts generatrix in which sections of diffusion character connection are formed, and at further heating, sections of cast nugget are formed in middle part of weld spots. When forming sections of cast nugget, zone of melting is made not exceeding half of area of weld spot, and at beginning of metal melting, welding current is cut off.

EFFECT: improved quality of welds, reduced labor input in manufacture of parts.

2 cl, 3 dwg

FIELD: machine engineering, possibly manufacture of non-detachable parts of steels and alloys.

SUBSTANCE: method is realized due to using electrode with heat resistant insert extending outside electrode base. Method comprises steps of selecting length of insert extension depending upon thickness and properties of material of thin part; placing welded parts between electrodes in such a way that electrode with insert is at side of thin part; at welding process deforming thin part according to length of insert extension for forming relief and making welded joint in deformation zone. At beginning of welding process thin part is deformed and surface area of mutual contact of parts is significantly reduced and increased density of welding electric current is provided. Heat concentration in zone of mutual touching of parts increases till fusion for providing welded joint.

EFFECT: simplified welding process of enhanced efficiency and lowered labor consumption.

2 cl, 4 dwg

FIELD: machine engineering, namely electrode devices of multi-spot contact welding machines, namely manufacture of wire articles such as gauze.

SUBSTANCE: apparatus includes electric current supply plates placed in single row between electric current supply plates and electrically insulated relative to said plates and one from another. Electric current supply plates are connected with secondary windings of transformer and they have electric contacts with current collecting plates on outer planes. "Dove-tail" guides are provided on lateral surfaces of current collecting plates. Electrode holders having two parts to which electrodes electrically connected with current supply plates are secured are mounted in guides. Pairs of electrodes are connected by means of jumper. It provides possibility for making high quality gauze due to identical electric current in all welded spots.

EFFECT: improved design, enlarged functional possibilities of apparatus due to continuously adjustable cross pitch of gauze in wide range.

5 dwg

Up!