CN105364293A - Copper and aluminum welding process - Google Patents
Copper and aluminum welding process Download PDFInfo
- Publication number
- CN105364293A CN105364293A CN201410392374.2A CN201410392374A CN105364293A CN 105364293 A CN105364293 A CN 105364293A CN 201410392374 A CN201410392374 A CN 201410392374A CN 105364293 A CN105364293 A CN 105364293A
- Authority
- CN
- China
- Prior art keywords
- welding
- copper aluminium
- welding technique
- board
- foil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Pressure Welding/Diffusion-Bonding (AREA)
- Coils Of Transformers For General Uses (AREA)
- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
Abstract
The invention provides a copper and aluminum welding process. A clean plate member and a clean foil member needing to be welded to the plate member are stacked in a matching manner, wherein the foil member is over the plate member and it is guaranteed that a to-be-welded part is located on a flat basis; with a pressure head moving in the basic normal direction, pits are formed at the welding part through pressing and welding spots are formed, wherein the connecting resistance between the foil member and the plate member is not greater than the connecting resistance of fusion welding on the same conditions. The copper and aluminum welding process has the advantages of high efficiency and good cold welding effect.
Description
Technical field
The present invention relates to a kind of copper aluminium welding technique, be mainly used in transformer reactance device class paper tinsel coiling field.
Background technology
In transformer ' s type loop product, more paper tinsel winding technologe is applied in the connection of electric-conductor.Because bauxite resource enriches, low price, the coiling of current transformer reactance device coil many employings aluminium foil, lead-out wire adopts copper bar or aluminium row.Between copper aluminium, fast and reliable welding is the current technical barrier faced, and mainly adopts following technique at present for this technical barrier: with copper aluminium row transition terminal
With argon arc welding welding or special flux welding, but there is various problems in these two kinds of modes, as: 1, with the terminal reliability less stable that flash welding or friction welding (FW) make.2, welding process consumes argon gas, and not only not environmentally, and argon gas and welding arc light have certain injury to human body.3, solder flux is expensive, and cost is too high.3, welding process is owing to producing larger heat, and need cooling, production efficiency is lower.
Cold press connector lug/lug plate comparatively early be applied in power domain, its basic scheme is that the side that coupling connects is prefabricated complete, and the opposing party makes the fittings body that can embed this cover, after embedding, suppresses this cover, and two sides are combined closely, this structure energy
Enough rapid shapings, non-environmental-pollution, but contact resistance rate is larger, and be generally used for small cross sections and amass and the special situation of connection end structure comparison.
China's CN1575906A application openly proposes a kind of Cold welding equipment; its background technology part is pointed out; Cold welding technology is a kind of method connecting ductile metal; general principle is under the pressure loading effect of concentrating; two contact surface areas that needs are connected expand, and the expansion of area makes the diaphragm of surface original obstruction welding break, and high pressure load makes again the pure metal collective close contact of exposure; produce interatomic combination, thus reach the effect of firmly welding.
Cold welding technology relative to other solder technology still than younger, in World War II, 2 blocks of overlapping aluminium sheets cut off with the object of similar blunt knife by Britain pilot Mr. Sowter, and the 2 blocks of aluminium sheets that stumbled on are combined closely by unknown strength.By this phenomenon, the GeneralElectricCo. research institute of Britain begins one's study the technology of cold welding metal, and brings this technology into field of industrial production.Current cold welding technology is widely used at built on stilts production field, communications cable production and same feeling production field.
Cold welding refers to that at normal temperatures only outer plus-pressure makes metal produce intense plastic strain and form the welding of joint
Method.During pressurizing and deformation, the oxide-film of work piece interface is destroyed and is extruded, and can purify welding point.Institute's plus-pressure is generally higher than the yield strength of material, to produce the deflection of 60 ~ 90%.Pressuring method can slowly extrude, roll extrusion or add impulsive force, and pressurization several times also can be divided to reach required deflection.The open repeatedly upsetting pressure technique that uses of CN1575906A application described above.
Applying another more scheme is utilize rub and in conjunction with the welding method of upsetting, efficiency is lower, and also needs to cool.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of efficiency comparison high, and the copper aluminium welding technique that cold welding effectiveness comparison is good.
In order to realize goal of the invention of the present invention, by the following technical solutions:
A kind of copper aluminium welding technique, coupling stacks clean board and needs to be welded on the foil part of the cleaning in this board, wherein foil part is upper, and ensure that position to be welded is on smooth basis, then pass through along lex fundamentalis to the pressure head moved, extrude pit in welding position, form solder joint, make the contact resistance of foil part and board be not more than the contact resistance of melting welding under the same terms.
Application principle: welded two kinds of metals produce plastic deformation by mechanical pressure, the oxide-film of work piece interface is destroyed and is extruded, move closer under external force between two kinds of metallic atoms, and interpenetrate, when most of metallic atom distance of contact surface reaches atomic distance, two kinds do not produce atom attraction between homoatomic, thus create the Cold welding between two kinds of metals.Cold welding could be welded due to needs metal plastic deformation, so only have ductile metal such as Cu, Al, Ag, Au, Ni, Zn, Cd, Ti, Su, Pb and alloy thereof to be just suitable for cold welding at present, any combination between them, comprise the immiscible non-coherence metal of liquid phase, solid phase as the combination of Al and Pb, Zn and Pb etc., also can carry out cold welding.Observe under micrometer microscope, cold welding joint, its combination interface all presents complicated peak valley and indenting space pattern, and its simple geometric cross section of faying face area ratio is large.Therefore, under normal circumstances, the cold welding strength of joint of each metal of the same race is not less than mother metal; The cold welding strength of joint of dissimilar metal is not less than the intensity of more weak metal.Because combination interface is large, again without mesophase spherule, so the electric conductivity of joint, corrosion resistance are excellent.
Therefore, according to copper aluminium welding technique of the present invention not only for the advantage that epimere is mentioned, and due to used pressure welding, directly utilize pressure head to form pit on two workpiece connected, namely can complete welding, efficiency is high.
Above-mentioned copper aluminium welding technique, described foil part and described board are the workpiece after annealing in process.
Above-mentioned copper aluminium welding technique, also comprises the step removing described foil part and described board surface film oxide.
Above-mentioned copper aluminium welding technique, the molded surface of described pit can be led continuously.
Above-mentioned copper aluminium welding technique, the cross section of described pit is the isosceles trapezoidal structure with round-corner transition.
Above-mentioned copper aluminium welding technique, foil part and board are 80 ~ 85% at the maximum material percentage elongation at solder joint place.
Above-mentioned copper aluminium welding technique, the foil of the selection range of described foil to be thickness be 0.1 ~ 3mm, the selection range of sheet material is the sheet material of 2.5 ~ 12mm.
Above-mentioned copper aluminium welding technique, one or more one group of described solder joint, has one group at least.
Detailed description of the invention
This programme is mainly used in the cold welding of copper aluminium, to having aluminium foil part or Copper Foil part, and aluminium row or copper bar, the surface cleaning of workpiece welding material in other words need be ensured, without greasy dirt and oxide-film, therefore, if there is corresponding surface quality situation, need to process accordingly.Because fine aluminium and fine copper are in atmosphere all than being easier to oxidation, therefore, preferably before welding, enter
The removing step of row oxide-film, to ensure the quality of welding.Because range of application is relatively narrow, corresponding welding material mainly aluminium and copper, application also mainly transformer reactance device class paper tinsel coiling, therefore, the pit depth limited with contact resistance or quality of connection have reasonable sign effect.Different pit depths is needed for different welding materials, is connecting
Connect object when determining, pit depth can draw in the experiment by limited number of time under the qualifications of contact resistance.
Based on principle and the above-mentioned statement of cold welding, a kind of copper aluminium welding technique, coupling stacks clean board and needs to be welded on the foil part of the cleaning in this board, wherein foil part is upper, and ensure that position to be welded is on smooth basis, then by along lex fundamentalis to the pressure head moved, extrude pit in welding position, form solder joint, make the contact resistance of foil part and board be not more than the contact resistance of melting welding under the same terms.
Overlay and also can be understood as overlap joint in some cases, as long as meet normally carrying out of crimping process, unstability just can not meet the demands.Certainly, in actual use, the workpiece such as aluminium row have reasonable location base, and the opposite face of its joint face is plane, easily positions on smooth seat.
The checking of the macroscopic view of contact resistance is relatively easy, as previously mentioned, can be verified by the experiment of limited number of time.There are some work hardening in foil part and board capital more or less in machined, and cold welding before describe in known, this technique is relatively high to the requirement of material, therefore, best described foil part and described board are the workpiece after annealing in process, to eliminate internal stress.
So further, in order to improve the effect of cold welding, also comprise the step removing described foil part and described board surface film oxide.In order to reduce difficulty of processing, the molded surface of described pit can be led continuously, and forming surface does not have the sharp keen angle of shear, platform
The structures such as rank, are convenient to shaping, are also beneficial to de-material simultaneously.
Further, the cross section of described pit is the isosceles trapezoidal structure with round-corner transition, so for shaping
The structural strength of the pressure head of mould is high, and is also conducive to de-material.
About the degree of depth of pit, the effect of rolling in theory is better, is more conducive to the formation of pressure welding solder joint, but roll excessive may drawing crack workpiece, or flow harden is serious, and antifatigue load-carrying ability is poor, therefore, preferably selection is, foil part and board are 80 ~ 85% at the maximum material percentage elongation at solder joint place, and the degree of depth of corresponding shaping solder joint pit is suitable, mates corresponding material, flow harden is not obvious, and service life is long.
According to this technique the foil of the selection range of described foil that is suitable for be thickness be 0.1 ~ 3mm, the selection range of sheet material is the sheet material of 2.5 ~ 12mm.
Preferably, in order to improve the reliability of connection, one or more one group of described solder joint, has one group at least.
Punching press copper bar 10mm, corresponding aluminium foil 2.0mm, die head hardness HRC56 ~ 60, pressure point pressure 2000MPa, it is by reasonable connection effect that calendering rate is greater than 85%.And as punching press copper bar 5mm, corresponding aluminium foil 1.0mm, other parameters are the same, and it is have reasonable connection effect that calendering rate is greater than 83%.When punching press copper bar selects 2.5mm, 0.5mm selected by corresponding aluminium foil, and other parameters are the same, and it is have reasonable connection effect that calendering rate is greater than 85%.
Claims (8)
1. a copper aluminium welding technique, it is characterized in that, coupling stacks clean board and needs to be welded on the foil part of the cleaning in this board, wherein foil part is upper, and ensure that position to be welded is on smooth basis, then by along lex fundamentalis to the pressure head moved, extrude pit in welding position, form solder joint, make the contact resistance of foil part and board be not more than the contact resistance of melting welding under the same terms.
2. copper aluminium welding technique according to claim 1, is characterized in that, described foil part and described board are the workpiece after annealing in process.
3. copper aluminium welding technique according to claim 1, is characterized in that, also comprises the step removing described foil part and described board surface film oxide.
4. copper aluminium welding technique according to claim 1, is characterized in that, the molded surface of described pit can be led continuously.
5. copper aluminium welding technique according to claim 4, is characterized in that, the cross section of described pit is the isosceles trapezoidal structure with round-corner transition.
6. copper aluminium welding technique according to claim 1, is characterized in that, foil part and board are 80 ~ 85% at the maximum material percentage elongation at solder joint place.
7. the copper aluminium welding technique according to claim 1 or 6, is characterized in that, the foil of the selection range of described foil to be thickness be 0.1 ~ 3mm, the selection range of sheet material is the sheet material of 2.5 ~ 12mm.
8. copper aluminium welding technique according to claim 1, is characterized in that, one or more one group of described solder joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410392374.2A CN105364293A (en) | 2014-08-12 | 2014-08-12 | Copper and aluminum welding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410392374.2A CN105364293A (en) | 2014-08-12 | 2014-08-12 | Copper and aluminum welding process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105364293A true CN105364293A (en) | 2016-03-02 |
Family
ID=55367185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410392374.2A Pending CN105364293A (en) | 2014-08-12 | 2014-08-12 | Copper and aluminum welding process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105364293A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099601A (en) * | 2016-06-07 | 2016-11-09 | 四川省泰禾机械有限公司 | A kind of copper-aluminium transition wire clip soldering process |
| CN108941877A (en) * | 2018-08-28 | 2018-12-07 | 桂林金格电工电子材料科技有限公司 | A kind of cold pressure welding process of silver-nickel wire rod |
| CN111230274A (en) * | 2020-03-12 | 2020-06-05 | 上海嘉益电器设备有限公司 | Reactor copper aluminium cold pressure welding crimping equipment |
-
2014
- 2014-08-12 CN CN201410392374.2A patent/CN105364293A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099601A (en) * | 2016-06-07 | 2016-11-09 | 四川省泰禾机械有限公司 | A kind of copper-aluminium transition wire clip soldering process |
| CN106099601B (en) * | 2016-06-07 | 2018-03-30 | 四川省泰禾机械有限公司 | A kind of copper-aluminium transition wire clip soldering process |
| CN108941877A (en) * | 2018-08-28 | 2018-12-07 | 桂林金格电工电子材料科技有限公司 | A kind of cold pressure welding process of silver-nickel wire rod |
| CN111230274A (en) * | 2020-03-12 | 2020-06-05 | 上海嘉益电器设备有限公司 | Reactor copper aluminium cold pressure welding crimping equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102489866B (en) | Cold pressure welding process for copper and aluminum | |
| Bay | Cold welding | |
| CN104668756B (en) | Aluminium base workpiece to steel workpiece multistep direct welding | |
| CN105478475B (en) | A kind of method of rolling high-strength degree composite metal plate | |
| DE102011103617B4 (en) | Method for forming a solid-state welded joint | |
| JP2013514188A (en) | Conductive composite component and method of manufacturing the same | |
| KR101819475B1 (en) | Resistance spot welding method | |
| CN105364293A (en) | Copper and aluminum welding process | |
| CA2609137A1 (en) | Hot forming system for metal workpieces | |
| CN101972889B (en) | Cold-pressure welding process for deformed zinc aluminum alloy rods | |
| TWI624323B (en) | Set of metal sheets and method for projection welding the metal sheets | |
| CN109794670B (en) | Dissimilar metal material resistance rivet welding system of light alloy and steel and welding method thereof | |
| CN113020261B (en) | Rolling method of metal composite plate with prefabricated corrugated interface | |
| CN110293149B (en) | Manufacturing device and manufacturing method of bimetal composite capillary | |
| KR20200086730A (en) | Manufacturing method of resistance spot welding joint | |
| Higashi et al. | Microstructure evolution and mechanical properties of extruded Mg96Zn2Y2 alloy joints with ultrasonic spot welding | |
| DE102014208706A1 (en) | Method and device for joining a composite sheet metal component with a functional element | |
| CN101478092A (en) | Conductive bus and manufacturing method thereof | |
| CN105382406A (en) | Connecting method for TiAl-Ni dissimilar metal | |
| JP7350369B2 (en) | Method of joining metal materials | |
| CN106808077A (en) | copper aluminium welding technique | |
| CN109986190A (en) | Copper aluminium welding technique | |
| CN107282740B (en) | A kind of drawing forming method of vanadium alloy plate | |
| CN202336665U (en) | Cold-pressing welding mould | |
| Balawender | The ability to clinching as a function of material hardening behavior |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160302 |
|
| WD01 | Invention patent application deemed withdrawn after publication |