Method of resistance soldering of electrical contacts with holders |
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IPC classes for russian patent Method of resistance soldering of electrical contacts with holders (RU 2379165):
 Method for installation of various types of surface-mounted components onto circuit board with help of vacuum pincers / 2374794
Invention may be used in technological process of manual installation of surface-mounted components (SMC) onto circuit boards under conditions of experimental, pilot and small-scale multiproduct production. SMC 8 are installed onto circuit boards 2, surfaces of which in zones of soldering are previously coated with layer 13 of flux or soldering paste. On suction head 9 of vacuum pincers 6 vacuum is pulled, which provides for suction force F1, sufficient for reliable gripping and retention of SMC 8, but less than total force of adhesion engagement F2 of the latter to layer 13 of flux or solder paste. Separate SMC 8 gripped with the help of vacuum pincers 6 are transferred to circuit board 2 in area of their installation, afterwards they are separated from vacuum pincers without disconnection from vacuum. Separation of each SMC 8 from vacuum pincers 6 at the place of their installation is done by force F3, equal to difference between force of adhesive engagement F2 and suction force F1. Installation of components of various type is carried out serially. Each time prior to installation of SMC of another type, according value of vacuum is established on pincers.
 Method of soldering with soft solder / 2372175
Proposed method can be used in wave or fountain soldering, or cascade soldering, or dip soldering or soldering with solder leveling by hot air knife, primarily, in producing p.c.b. Active additive liquid layer is kept up on molten solder surface, aforesaid layer containing dimmer acid to remove metal oxide from solder and absorb it. Said active additive represents organic liquid with nucleophilic and/or electrophilic groups. Molten solder is purified in situ to make soldering more efficient, particularly in using leadless solder. Removal of metal oxide cleans the bath and reduces solder viscosity to up reliability of soldered connections.
 Method and device for soldering by reflowed solder with control of volume flow / 2329624
In compliance with one aspect of the given invention, the problem of fast heating of an object being soldered is solved by reducing an initially large volume flow at constant or increasing temperature, thus preventing an overheat of minor components. Application of a volume flow of convective heater to control actual supply of heat onto the object to be soldered makes it possible to flexibly adjust the soldering process to specific requirements.
Precision flexible loop and method for high density assembly of electronic device using such loops / 2312474
In accordance to the invention, as substrate material, polyimide, polyether and fluoroplastic films are used. Polyimide film substrates make it possible to achieve high thermal stability of loops and allow usage of different methods of assembly, including welding and soldering, and fluoroplastic films are most usable for making loops based on them for assembly of UHF circuits, due to low losses in UHF frequency range and possible constant wave resistance of loops which connect UHF modules and devices. Structure and placement of contact areas, meant for assembly of electronic components or connection of loop to other devices or electronic boards, and also materials and covers, used for forming aforementioned contact areas, must also provide for high density inter-cell connection in electronic equipment. To that end, contact areas are positioned on the other side of flexible substrate and connected to working conductors via through metallized apertures in the substrate. External sides of contact areas are tin-plated, for example, covered in layer of tin-bismuth alloy, onto the surface of contact areas which is adjacent to substrate, a layer of material is applied to prevent spreading of soldering alloy, chromium for example, and connection of contact areas of loop to contacts of electronic devices is realized by welding-soldering using double electrode tool for micro-mounting, brought to contact with the other surface of contact area via through aperture in the film positioned above the contact area.
Soldering method of lead-free electric radio components to printed circuit board / 2311272
Method comprises steps of preliminarily drying electric radio components; applying flux onto places for mounting components in printed circuit board and drying it in air for 10 - 15 min; simultaneously heating for 20 -25 min electric radio components and printed circuit board till temperature that differs from melting temperature of solder by 100 -150°C; then placing components onto respective sites on printed circuit board and soldering them for 2 - 3 s.
 Printed circuit board for soldering the solder columns / 2199840
The invention relates to electrical engineering and can be used in electronics, instrumentation
Method for laser soldering of thin wires / 2172232
 The chip module and method of manufacturing the chip module / 2165660
The invention relates to circuits, namely the chip module
 Multilayer switching fee (options) / 2133081
The invention relates to the development and production of equipment on the basis of microelectronics and semiconductor devices, and can be widely used in the manufacture of multilayer printed circuit boards, as well as switching structures for multichip modules
 Device for soldering wave solder / 2081520
 Method for contact-butt welding of pipe with plug / 2378091
Invention is related to method of contact-butt welding of pipe with plug and may find application in manufacturing of rod fuel elements of nuclear plants. Method includes placement and fixation of pipe end with deepening in welding auxiliaries. Heating of pipe end and plug pressed by butts by welding current, at that plug has section welded into pipe wall, with diametre that is larger than internal one, but is less than external diametre of pipe, and further welding of plug into pipe wall with alternating speed of plug motion. Pipe end on section with length of 1.5-3 of pipe wall thickness is placed on section of welding auxiliaries, electric resistance of which is less than resistance of pipe section material in zone of welding. Heating of pipe end and plug pressed by butts by welding current is carried out due to contact resistance in butt between end of pipe and plug and area of welding current supply into pipe, which is arranged at the distance equal to 1.5-3 of pipe wall thickness from its end. Besides heating of welded parts in process of welding to arrange zone of thermal effect, which is common in length of welded joint with width in central part of welded joint, which is equal to 0.1-3 of pipe wall thickness.
 Method for welding of flat panels with header pipe / 2374054
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.
 Installation for welding of annular joints of envelopes / 2374053
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.
 Method of automatic arc welding with melting electrode for seams with periodical variable cross section / 2374048
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.
 Method of arc welding with tungsten electrode in inertial gas medium / 2374047
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.
 Method of car truck bolster saddle build-up electric arc welding / 2369472
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.
 Method of large-size nozzle of rocket liquid-propellant engine (rlpe) chamber / 2368480
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.
 Method for welding of pyrolysis furnace pipes in process of repair works performance / 2361709
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.
 Method of auger manufacture and auger / 2361692
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.
 Welding cage for assemblage and welding of finite length pipes / 2361691
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.
 Installation of mechanised plasma welding deposition for details of type "shaft" / 2379164
Installation contains stand and installed in it carriage consisting of front and back mandrel for fixation of treated detail. Workhead drive installed on carriage consists of electric motor, drive belting, bearing mount assembly and tachometre generator. Workhead drive installed on carriage consists of electric motor, drive belting, bearing mount assembly and tachometre generator. Detail is installed in centers and as additional bearing for long-measuring details it is used centering device. On stand it is fixed blacket with located on it plasmatron, mechanism of wire feeding, device for thickness control of pad, pyrometre for heating control of detail surface before plasma arc front. On stand there are installed limit switches restricting movement of carriage. Movement drive, rotation drive, plasmatron with feeding mechanism of wire, device for control and pyrometre are connected to control assembly.
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FIELD: electrical engineering. SUBSTANCE: surfaces of parts to be soldered together are preliminary wetted with saturated water solution of soldering flux. Mix of phosphorus-containing copper-based solder with powder of said flux is arranged between the parts, said mix representing a minced chips with particle size of 0.5 to 1 mm. Flux amount in said max makes 3 to 8 wt %. Electrodes press the parts together to heat them to soldering temperature by passing electric current through electrodes, parts and solder. Temperature of 800 to 820°C reached, aforesaid solder representing a wire element is introduced in joint along contact outline till the end of soldering. EFFECT: higher strength and quality of soldered connection. 1 dwg, 1 ex
The invention relates to the field of brazing and soldering method, the electrical resistance of the electrical contacts with holders, and can be used, in particular, on railway transport. There is a method of soldering a resistor, which consists in passing an electric current through the pressed electrodes to each other products in between the solder and flux. Solder can be used in the form of foil, pre-coated with flux, in the form of plates, wetted on both sides with a solution of flux, or in the form of wire (see Sveska and other Soldering metals, M., "engineering", 1988, s-219). For connection of electrical contacts made of composite materials with holders used in practice this method soldering resistance with the use of silver-containing solders in the form of a foil. The disadvantage of this method is the high cost solder. The technical result that can be obtained from the use of the method according to the invention, is to increase the strength and quality of the soldered connections of the electrical contacts with holders and reducing costs. This technical result is achieved in the method of soldering the electrical resistance of the electrical contacts with holders, namely, that the surface pripevami parts pre is varicella moistened with saturated aqueous flux, then between the parts, place the mixture of solder on the base of copper in the form of crushed chips with a particle size of 0.5 to 1 mm and a powder flux, number flux in the mixture is 3 to 8 wt.%, compress the details of the electrodes and is heated to the soldering temperature by an electric current flowing through the electrodes, brazed parts and solder, and when the temperature reached 800-820°C until the end of the soldering on the circuit connections impose additional solder in a wire element. The method according to the invention can be used for soldering the electrical contacts of the materials based on copper and copper or brass holders. When carrying out soldering is used the solder not containing silver, such as copper-phosphorous containing phosphorus 6-10 wt.%. The use of phosphorous solders allows you to get the solder joints with a high softening temperature (~900°C). Pre-wetting surfaces pripevami parts saturated solution of flux provides a more complete wetting of connected surfaces with solder. Chip solder with a particle size of 0.5 to 1 mm is thoroughly mixed with the powder flux, taken in an amount of 3-8 wt.%. The use of a mixture of powder flux and chip solder allows you to spread them evenly over the surface. Adding solder in a wire element in blast soldering on the circuit brazed connection provides the gap and leads to the formation of fillets or solder flows, reinforcing the connection of electrical contacts with the holders. The proposed method is illustrated in the drawing, which shows external views of the resulting soldered joints: a - education of the bucket; b - education influx of solder, where 1 - holder; 2 - solder; 3 - working portion of the electrical contact. The result of the claimed process soldering is strong enough connection of electrical contacts with the holders having a high temperature falling at a lower cost compared with the silver-containing solders. Example. Was carried out by soldering the electrical resistance of the electrical contacts of the nanomaterial based on copper and copper holders contactor KM-2334 diesel locomotive 2TE116 series. Brazing was carried out on the machine welding MTP-2401. In the first case used silver solder in the form of foil having a thickness of 0.5 mm While adding solder to the soldering area is not produced. In the second case, the soldering of electrical contacts was performed using a powder magnetostrictive solder MP with the addition of ~ 6% of flux MF-H. When the temperature reached in the field of soldering 800°C produced the additional application of solder MP in the form of a wire element along the contour in the region of the soldering, thereby forming the chamfers (see drawing). Electrical contacts, priyanie to holders known SPO is obom, had lower strength solder joints and lower temperature falling compared with the proposed method. When testing the tensile strength of brazed joints produced in a known manner, was 150-190 MPa in comparison with the method according to the invention, allowing to obtain the strength of the solder joints 200-250 MPa. Thus, compared to known the claimed method provides a more durable connection of electrical contacts with the holders having a large temperature falling. The soldering method, the electrical resistance of the electrical contacts of the materials based on copper and copper or brass holders, including accommodation between the joined parts of solder and flux, the compression parts of the electrodes and heating to soldering temperature electric current flowing through the electrodes, brazed parts and solder, characterized in that the surface pripevami parts pre-moistened with saturated aqueous flux, then between the parts, place the mixture of phosphate solder on the base of copper in the form of crushed chips with particle size 0.5-1 mm and powder mentioned flux, number flux in the mixture is 3 to 8 wt.%, and when you reach in the process of heating temperature 800-820°C until the end of the soldering on the circuit connections impose additional UE is mentioned solder in a wire element.
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