CN100496843C - Brazing method of aluminium electric-magnetic wires and Guinea gold - Google Patents
Brazing method of aluminium electric-magnetic wires and Guinea gold Download PDFInfo
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- CN100496843C CN100496843C CNB2007100268903A CN200710026890A CN100496843C CN 100496843 C CN100496843 C CN 100496843C CN B2007100268903 A CNB2007100268903 A CN B2007100268903A CN 200710026890 A CN200710026890 A CN 200710026890A CN 100496843 C CN100496843 C CN 100496843C
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Abstract
A method for solder welding aluminum electromagnetic wire and brass comprises aluminum electromagnetic wire and brass connector. The invention comprises that first plating nickel on the surface of brass connector to improve the connecting strength between the solder and the brass connector and the corrosion resistance of aluminum copper connector, while said nickel layer can insulate aluminum atom and copper atom to avoid them to form rigid metal compound layer which will reduce the strength of connector, then using drug Al-Si rigid solder as non-corrosion aluminium fluoride potassium, using flame welding to weld the aluminum electromagnetic wire and the nickel layer of brass connector, the brass connector is treated with neutral oil removing, ultrasonic oil removing, water washing, acid washing, water washing, activating, waster washing, nickel plating, and drying. The inventive aluminum electromagnetic wire and brass connector have same anti-drawing strength, while the resistance of aluminum copper connector is less than the aluminum electromagnetic wire.
Description
Technical field
The present invention relates to the method for welding of a kind of aluminium magnet wire and brass, the method for welding of particularly a kind of aluminium magnet wire of aluminium conductor power transformer winding and brass connector.
Background technology
In recent years, continuous development along with the power system installed capacity, the power transmission and transforming equipment demand also increases very fast, power transmission and transforming equipment engenders the phenomenon that supply falls short of demand with raw material, but, the price of the main raw material(s) copper that transformer industry uses but goes up always, in order to seek the better evolutionary path of enterprise, strengthen enterprise competitiveness, the many enterprises of transformer industry are all in the unfavorable factor of responding actively the copper product rise in price, develop a kind of transformer of supplementary-aluminium conductor, to satisfy a part of market demand.
The coil of aluminium conductor dry-type transformer is cast with epoxy resin outward, and coil adopts aluminium magnet wire or aluminium foil coiling, and in order to improve the intensity of outlet terminal, copper bar or copper nut are adopted in the coil outlet.After adopting aluminum coil and copper outlet structure, the primary main technique problem that solves is the welding of aluminium and copper.Because transformer coil is operated under the high voltage, need bearing great current, temperature rise, electric and magnetic oscillation and short-circuit electromotive force, so require that the aluminum bronze welding point is solid and reliable, electric conductivity is good.
At the seventies in last century six, China also once carries out the development and application of aluminium conductor transformer energetically, but often breaks down owing to the aluminium conductor transformer afterwards: outlet terminal is the aluminium conductor insufficient strength when short circuit, causes winding deformation easily; In order to improve the intensity of outlet terminal, to attempt replacing the aluminium outlet, but occur new problem subsequently with copper, its subject matter is that the reliability and stability of aluminum bronze welding point can be not enough, uses so reduce gradually.At present, more external developed countries and overseas-funded enterprise begin to produce the aluminium conductor transformer, its joint of aluminium and copper methods of the sleeve pipe of colding pressing that adopt realize more, be that aluminum steel inserts a special copper sleeve respectively with copper cash from two when being connected, and then with cord end plier copper sleeve is flattened, aluminum steel is finished with copper cash be connected.The shortcoming of this method is: the joint diameter increases a lot, is unfavorable for the coiling of transformer coil; Operation is also cumbersome simultaneously.And domestic manufacturer produces the aluminium conductor transformer and adopts friction welding (FW) aluminum bronze transit joint more, and the shortcoming of this method is: joint of aluminium and copper usually becomes fragile joint and ftractures because temperature is too high in the process of being welded to connect; The reason of its cracking be since joint of aluminium and copper at high temperature, aluminium and copper atom diffuse to form the intermetallic frangible compounds, and constantly thickening causes; On the other hand, circular friction welding joint produces work hardening in being pressed into the flat process, is difficult to bending and forming when coil winding; Owing to adopt direct brazed aluminum electromagnetic wire of Zn-Al solder and brass nut, joint tensile strength is low to be 26MPa, can not satisfy instructions for use, and this joint can not satisfy requirements such as high strength and high corrosion resistance simultaneously, so the friction welding (FW) and the soldering processes of existing aluminum bronze await further perfect.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of can satisfy the aluminium magnet wire of high strength, high corrosion resistance and the method for welding of brass, to overcome weak point of the prior art.
The technical scheme that the present invention solves the problems of the technologies described above employing is: the method for welding of a kind of aluminium magnet wire and brass, comprise aluminium magnet wire and brass connector, it is characterized in that earlier the surface of brass connector being handled through electroplating nickel plating or chemical nickel plating, with bonding strength and the enhancing joint of aluminium and copper corrosion resistance that strengthens solder and brass connector, adopt medicine core formula Al-Si hard solder then, the medicine core is non-corrosive potassium aluminum fluoride flux, with gas brazing aluminium magnet wire and brass connector nickel plating surface portion is carried out lap brazing.
Before soldering, the nickel coating that the surface of brass connector is carried out can be isolated aluminium atom and copper atom earlier, can prevent its phase counterdiffusion, and forms compound layer between brittle metal, and joint of aluminium and copper intensity is reduced.
Before soldering, the weld seam position should not have greasy dirt, oxide-film and other impurity.Degrease: remove the greasy dirt on surface with acetone or other organic solvent; Oxide film dissolving: remove oxide-film with instruments such as wire brush or scrapers.Weldment after the cleaning should carry out welding job immediately, and should not surpass 24h its blanking time.
When gas brazing, can in advance the solder brazing flux be placed on place to be welded, heat simultaneously with weldment; Also can earlier weldment be heated to brazing temperature, again medicine core solder be delivered to the soldering position, treat the fusing of brazing flux and solder, slowly remove flame after the even joint filling of solder again.Should avoid flame is directly heated solder and brazing flux, in order to avoid the brazing flux overheating failure.After joint forms, should in time stop heating, to avoid the mother metal corrode.
Adopt the aluminium magnet wire of the present invention's welding and the joint of brass connector, the tensile strength of joint tensile strength and aluminium magnet wire is basic identical; The joint of aluminium and copper resistance value is less than the aluminium magnet wire resistance value; At 155 ℃, joint heatproof degree changes functional; The joint resistance to elevated temperatures is better.Soldered fitting can satisfy the welding requirements of the aluminium magnet wire and the brass connector of aluminium conductor power transformer winding.
Description of drawings
Fig. 1 is the structural representation of one embodiment of the invention soldered fitting.
Fig. 2 is the plan structure schematic diagram of Fig. 1.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Among the figure, 1 is aluminium magnet wire, and 2 is weld seam, and 3 is brass brass connector.
Referring to Fig. 1-2, the method for welding of this aluminium magnet wire and brass, before welding, earlier the surface of brass connector is handled through electroplating nickel plating or chemical nickel plating, with bonding strength and the enhancing joint of aluminium and copper corrosion resistance that strengthens solder and brass connector, adopt medicine core formula Al-Si hard solder then, the medicine core is non-corrosive potassium aluminum fluoride flux, with gas brazing aluminium magnet wire and brass connector nickel plating surface portion is carried out lap brazing.
The brass connector passes through following technology successively: neutral oil removing-ultrasonic wave oil removing-washing-pickling-washing-alkaline copper plating-washing-activation-washing-foregoing plating nickel plating or chemical nickel plating processing-washing-oven dry.
Wherein, 1) neutral oil removing is at room temperature, adopts 20～30% YJ-010 type degreasing agent, handles 0.75～1.25h;
2) the ultrasonic wave oil removing is under 50 ℃～70 ℃ temperature, and the processing time is 1～10min in 3～8% RS-86B type Wax removal water;
3) pickling is to soak 5～20s in 30% concentrated hydrochloric acid;
4) activation is that soak time is not more than 2min in 10% hydrochloric acid;
Wherein, a) in the electroplate liquid when electroplating nickel plating each main component and concentration be: nickelous sulfate NiSO
47H
2O, 150～250g/L, nickel chloride NiCl
26H
2O, 40～60g/L, boric acid H
3BO
3, 40～50g/L, under 45～60 ℃ of temperature, current density is 0.5～2.5A/dm
2, the processing time is 0.75～1.5h, and wherein the pH value of electroplate liquid is 3.8～5.5, and nickel layer thickness is 5～20 μ m;
B) chemical nickel plating adopts hypophosphites to make reducing agent, and its course of reaction is:
Wherein, section H
2PO
2 -Being reduced into phosphorus by hydrogen atom is mixed in the coating; Plating bath main component and operating condition are: nickelous sulfate NiSO
47H
2O:10～50g/L, sodium hypophosphite NaH
2PO
23H
2O:10～50g/L, sodium acetate NaC
2H
3O
23H
2O:10～40g/L, natrium citricum (Na
3C
6H5O
72H
2O): 15～19g/L, the pH value of plating bath are 4.5～5.5, and reaction temperature is 75 ℃～95 ℃, and deposition velocity is 10～25 μ m/h, coating phosphorus content: 5～9%.
6) alkaline copper plating step, electroplate liquid main component and concentration are: cuprous cyanide CuCN:45～60g/L, Cymag NaCN:65～85g/L, NaOH NaOH:5～20g/L, temperature is 40～60 ℃, current density is 0.5～2.5A/dm
2, the reaction time is 2～8min, the red copper layer thickness is 7～12 μ m during alkaline copper plating.If, can cancel the alkaline copper plating step satisfying under the situation of nickel-plated quality.
It is 9.0～13.0% that the mass percent of the medicine core formula Al-Si hard solder main component of using during soldering is followed successively by Si, Cu＜4.70%, and Zn＜0.20%, Mg＜0.15%, Mn＜0.15%, Fe＜0.8%, other element total amount 0.15%, Al is a surplus; The brazing flux main component is K
3AlF
6And KAlF
4The solder liquidus curve is 582～596 ℃, and brazing temperature range is 582～604 ℃; Wherein, the weight ratio of solder and brazing flux is 4:1～1:1.
Preferred embodiment of the present invention is Cu＜2.70%, the weight ratio 3.5:1 of solder and brazing flux～2:1, and all the other are the same.
Adopt the golden flame gaseous-pressure of 0.001～0.10MPa during soldering, welding torch H01-12A, No. 1～5, tip, oxygen pressure: 0.4～0.7MPa during soldering, is L with the fine aluminium trade mark
1～L
4Aluminium magnet wire and the nickel plating of common hexagonal brass rod H62 partly overlap.
Owing to adopted medicine core formula Al-Si solder, when gas brazing, can avoid flame directly to heat brazing flux, make the brazing flux overheating failure.Promptly;
Apparent in view when this is reflected at 600 ℃, brazing flux stays insoluble residue with hydrolysis.
When gas brazing, can in advance the solder brazing flux be placed on place to be welded, heat simultaneously with weldment; Also can earlier weldment be heated to brazing temperature, again medicine core solder be delivered to the soldering position, treat the fusing of brazing flux and solder, slowly remove flame after the even joint filling of solder again.Should avoid flame is directly heated solder and brazing flux, in order to avoid the brazing flux overheating failure.
The soldered fitting performance test:
1) test condition
Aluminium magnet wire 1 wire gauge is 4.25 x 9mm, fine aluminium trade mark L
1～L
4
Brass connector 3 parent materials are 18 common hexagonal brass rod H62,
Soldering overlap joint area: 9 x 15=135mm
2,
2) joint tensile strength: be 59.7MPa, basic identical with aluminium magnet wire tensile strength.
3) connection resistance test: joint of aluminium and copper resistance value=21.8 micro-ohms＜aluminium magnet wire resistance value=33.1 micro-ohms.
4) joint heatproof degree changes performance test: with brazed aluminum copper sleeve sample, carry out heat cycles, that is: 155 ℃ → insulation of room temperature → be heated to 5h → drop to room temperature is heated to 155 ℃ again, ... after so continuous heat cycles 5 times, take out sample and do tension test.
The result: brazed aluminum copper sleeve sample tensile strength does not have abnormal conditions, is 59.1MPa, and tensile sample all ruptures at aluminum steel.
5) joint resistance to elevated temperatures test: with the joint of aluminium and copper sample, be heated to 300 ℃, and insulation 2h.Do test for tensile strength behind the cool to room temperature, soldered fitting ruptures on aluminium magnet wire as a result.The joint resistance to elevated temperatures is good.
In sum, can satisfy the welding requirements of the aluminium magnet wire and the brass connector of aluminium conductor power transformer winding fully according to the soldered fitting of soldering of the present invention.
Claims (2)
1. the method for welding of aluminium magnet wire and brass, comprise aluminium magnet wire and brass connector, it is characterized in that earlier the surface of brass connector being handled through electroplating nickel plating or chemical nickel plating, with bonding strength and the enhancing joint of aluminium and copper corrosion resistance that strengthens solder and brass connector, adopt medicine core formula Al-Si hard solder then, the medicine core is non-corrosive potassium aluminum fluoride flux, with gas brazing aluminium magnet wire and brass connector nickel plating surface portion is carried out lap brazing; The brass connector passes through neutral oil removing, ultrasonic wave oil removing, washing, pickling, washing, activation, washing, foregoing plating nickel plating or chemical nickel plating processing, washing and baking step successively;
Wherein, 1) neutral oil removing is at room temperature, adopts 20～30% degreasing agent, handles 0.75～1.25h;
2) the ultrasonic wave oil removing is under 50 ℃～70 ℃ temperature, and the processing time is 1～10min in 3～8% Wax removal water;
3) pickling is to soak 5～20s in 30% concentrated hydrochloric acid;
4) activation is that soak time is not more than 2min in 10% hydrochloric acid;
5) Nickel Plating Treatment,
When a) electroplating nickel plating, each main component and concentration are in the electroplate liquid:
Nickelous sulfate NiSO
47H
2O, 150～250g/L,
Nickel chloride NiCl
26H
2O, 40～60g/L,
Boric acid H
3BO
3, 40～50g/L,
Under 45～60 ℃ of temperature, current density is 0.5～2.5A/dm
2, the processing time is 0.75～1.5h, and wherein the pH value of electroplate liquid is 3.8～5.5, and nickel layer thickness is 5～20 μ m;
B) during chemical nickel plating, adopt hypophosphites to make reducing agent, its course of reaction is:
Wherein, section H
2PO
2 -Being reduced into phosphorus by hydrogen atom is mixed in the coating;
Plating bath main component and operating condition are: nickelous sulfate NiSO
47H
2O:10～50g/L,
Sodium hypophosphite NaH
2PO
23H
2O:10～50g/L,
Sodium acetate NaC
2H
3O
23H
2O:10～40g/L,
Natrium citricum (Na
3C
6H
5O
72H
2O): 15～19g/L,
The pH value of plating bath is 4.5～5.5, and reaction temperature is 75 ℃～95 ℃, and deposition velocity is 10～25 μ m/h, and nickel coating thickness is 5～20 μ m, wherein coating phosphorus content: 5～9%.
2. the method for welding of aluminium magnet wire according to claim 1 and brass is characterized in that being provided with the alkaline copper plating step between described washing and the activation, after this step water-washing step is set, and electroplate liquid main component and concentration are:
Cuprous cyanide CuCN:45～60g/L,
Cymag NaCN:65～85g/L,
NaOH NaOH:5～20g/L,
Reaction temperature is 40～60 ℃, and current density is 0.5～2.5A/dm
2, the reaction time is 2～8min, the red copper layer thickness is 7～12 μ m during alkaline copper plating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100268903A CN100496843C (en) | 2007-02-07 | 2007-02-07 | Brazing method of aluminium electric-magnetic wires and Guinea gold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100268903A CN100496843C (en) | 2007-02-07 | 2007-02-07 | Brazing method of aluminium electric-magnetic wires and Guinea gold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101015875A CN101015875A (en) | 2007-08-15 |
| CN100496843C true CN100496843C (en) | 2009-06-10 |
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ID=38725185
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100268903A Active CN100496843C (en) | 2007-02-07 | 2007-02-07 | Brazing method of aluminium electric-magnetic wires and Guinea gold |
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Families Citing this family (14)
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| CN101556846B (en) * | 2009-05-19 | 2010-11-03 | 丹凤县永鑫电子材料有限责任公司 | Technique for producing nickelplated mischmetal annealed copper wire |
| CN102376984B (en) * | 2010-08-25 | 2013-07-31 | 惠州泰科立集团股份有限公司 | Ultrathin rechargeable battery and manufacturing process thereof |
| CN102357744B (en) * | 2011-10-20 | 2015-02-25 | 银邦金属复合材料股份有限公司 | Novel 4Al3 aluminum alloy used for vacuum soldering |
| CN102909325B (en) * | 2012-11-12 | 2014-07-16 | 南昌航空大学 | Laser-induction compounded cladding method for repairing continuous casting crystallizer |
| CN103521943B (en) * | 2013-10-31 | 2015-12-02 | 北京有色金属与稀土应用研究所 | The soldering preparation method of Al-Si-Cu alloy seamless flux-cored wire |
| CN103551757B (en) * | 2013-10-31 | 2015-11-11 | 北京工业大学 | Soldering alusil alloy seamless flux-cored wire, preparations and applicatio |
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| CN104439739B (en) * | 2014-11-08 | 2016-12-07 | 平顶山天晟电气有限公司 | Brass bar and the welding procedure of flat type aluminium wire in a kind of dry-type transformer |
| CN105269182B (en) * | 2015-11-25 | 2017-09-15 | 天津航空机电有限公司 | The solder brazing method and flux-cored wire of a kind of small overlapping area |
| CN107829079A (en) * | 2017-08-30 | 2018-03-23 | 欣旺达电动汽车电池有限公司 | A kind of method for carrying out aluminium wire solder bonds in battery core block |
| CN110253103A (en) * | 2019-07-10 | 2019-09-20 | 苏州科伦特电源科技有限公司 | A kind of copper aluminium welding method |
| CN112338316B (en) * | 2020-10-27 | 2022-07-05 | 国网河南省电力公司电力科学研究院 | Brazing process of high-strength and high-toughness copper-aluminum joint |
| CN113145963B (en) * | 2021-06-08 | 2023-05-02 | 广西易德科技有限责任公司 | Water nozzle welding method for water chamber of water-cooled radiator |
| CN113878189B (en) * | 2021-09-09 | 2022-11-15 | 中国航发南方工业有限公司 | Vacuum brazing process for honeycomb assembly of aircraft engine |
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Owner name: AREVA- SUNTEN ELECTRIC CO. LTD. Free format text: FORMER OWNER: SUNTEN ELECTRIC CO. LTD Effective date: 20100129 |
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Effective date of registration: 20100129 Address after: Guangdong province Foshan city Shunde District Daliang Honggang Industrial Zone Patentee after: Areva-Sunten Electric Co., Ltd. Address before: Guangdong province Foshan city Shunde District Daliang Honggang Industrial Zone Patentee before: Sunten Electric Co., Ltd. |
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Owner name: SUNTEN ELECTRIC CO. LTD. Free format text: FORMER NAME: AREVA-SUNTEN ELECTRIC CO., LTD. |
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Address after: 528300 Guangdong Province, Foshan city Shunde District Daliang Honggang Industrial Zone Patentee after: Sunten Electric Equipment Co., Ltd. Address before: 528300 Guangdong Province, Foshan city Shunde District Daliang Honggang Industrial Zone Patentee before: Areva-Sunten Electric Co., Ltd. |