CN104117748B - A kind of high voltage power transmission and transforming contact and welding method thereof - Google Patents

A kind of high voltage power transmission and transforming contact and welding method thereof Download PDF

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Publication number
CN104117748B
CN104117748B CN201410408281.4A CN201410408281A CN104117748B CN 104117748 B CN104117748 B CN 104117748B CN 201410408281 A CN201410408281 A CN 201410408281A CN 104117748 B CN104117748 B CN 104117748B
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China
Prior art keywords
contact
stem
contact body
power transmission
voltage power
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CN201410408281.4A
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CN104117748A (en
Inventor
李秀朋
龙伟民
钟素娟
朱坤
沈元勋
张雷
周许升
齐剑钊
孙华为
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Zhengzhou Research Institute of Mechanical Engineering Co Ltd
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Zhengzhou Research Institute of Mechanical Engineering Co Ltd
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/008—Soldering within a furnace
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3033—Ni as the principal constituent
    • B23K35/304—Ni as the principal constituent with Cr as the next major constituent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Contacts (AREA)

Abstract

A kind of high voltage power transmission and transforming contact and welding method thereof, described high voltage power transmission and transforming contact includes contact body and contact stem two parts, described contact body is combined by welding manner with contact stem, in order to meet slider material good conductivity, good resistance fusion welding, resistance to electrical wear is good, and contact resistance is low, condition that when being electrified for a long time, temperature rise is the highest and improve service life of electrical contact, contact body part uses high-strength graphite to make；Contact stem part uses T2Y hard state red copper machine-shaping.

Description

A kind of high voltage power transmission and transforming contact and welding method thereof
Technical field
The present invention relates to high voltage power transmission and transforming contact and the welding method thereof of a kind of high arc resistant ablation.
Background technology
Electrical contact refers to contact with each other between two conductors and realize electric current by contact interface transmit or a kind of physics of signal transmission, chemical phenomenon.Electrical contact is the core parts of device for switching, it is to affect break-make transfer capability and the key factors of reliability such as the most all kinds of air switch of device for switching, relay, A.C. contactor, electrical contact is in use in open and close state frequently, therefore the highest to slider material electrical property and mechanical property requirements, its main performance requirements has: good conductivity, good resistance fusion welding, and resistance to electrical wear is good, contact resistance is low, and when being electrified for a long time, temperature rise is the highest.Electrical contact in high voltage power transmission and transforming net needs to be on active service under the high pressure of 550kV, 330kV, 220kV, 110kV, therefore the strictest to its requirement.
At present, there is electric quantity loss compared with problems such as big, utilization rate of electrical is low, the time between overhauls(TBO) is short, accident frequently generations in China's power system power transmission and transformation process, and these problems are largely due to that electrical contact is off quality to be caused.Along with the high speed development of modernization construction, high voltage power transmission and transforming net load increases day by day, and device for switching develops towards higher voltage, more capacity direction.And traditional W/Cu electrical contact material causes contact premature failure owing to being easily generated arc erosion contact surface under high pressure, the big function of current, the requirement of high voltage power transmission and transforming net cannot be met.Therefore, find a kind of electrical contact material significantly improving arc resistant ablation property, have important practical significance.
In recent years, the domestic research for improving contact material arc resistant ablation property is more, such as Northwestern Polytechnical University (2009) have studied B, Nb, Ce element on the impact of W/Cu contact material arc characteristic (Chen Wenge, Chen Mian it, punishment power is modest, Li Jinshan, flood peak, the doping impact on WCu electrical contact material arc characteristic, China YouSe Acta Metallurgica Sinica, 19(11), 2009,2029-2037)；Xi'an University of Technology (2008) have studied rare earth element on the impact of W/Cu contact material arc characteristic (Chen Mian it, Chen Wenge, punishment power is modest, Dai Guangqian, the different rare earth element impacts on W-Cu electrical contact material performance, Special Processes of Metal Castings and non-ferrous alloy, 28(7), 2008,570-572)；Iron and Steel Research Geueral Inst (1981) have studied the arc characteristic (Lv great Ming, Mu Keqiang, Tang Anqing, the development of tungsten-new electric contact material of copper-magnesium oxide and arc resistant ablation characteristics, mechanical engineering material, 1981(6) of W-Cu-MgO material, 40-44)；Ji'nan University (2006) have studied DJB-823 solid film protectant arc resistant characteristic (Tang Zhenfang, Liu Xin, contact lubricant arc resistant characteristic research lubricate and seal, 2006(11), 119-122)；Xi'an University of Architecture and Technology (2005) have studied the arc erosion performance (Wang Linru, Xu Yunhua, the research of fibre structure W/Cu contact material arc erosion performance, heat processing technique, 2005(9) of the W/Cu contact material of fibre structure, 45-46)；Xi'an Communications University (2002) have studied (Chen Wenge; fourth is held political power, Zhang Hui, nanocrystalline W-Cu electrical contact materials prepared by mechanical alloying; China YouSe Acta Metallurgica Sinica; 12(6) such as the arc erosion performances of nanocrystalline W/Cu contact material, and 2002,1224-1228); but W/Cu alloy price is particularly expensive; and the production cycle is long, and the impact of the study on the modification antagonism arc erosion of W/Cu alloy is still in the experimentation stage, in a short time cannot popularization and application.In order to improve product cost, research worker proposes W/Cu alloy machine-shaping expensive for contact part, contact stem is processed into by relatively inexpensive T2Y hard state red copper, then method for welding is used to connect contact and contact stem, but soldered fitting ratio of brazing area is extremely difficult to more than 95%, directly affects connection resistance.
Summary of the invention
The purpose of the present invention provides a kind of high voltage power transmission and transforming contact and welding method thereof just for the weak point in the presence of above-mentioned prior art.
The purpose of the present invention can be realized by following technique measures:
The high voltage power transmission and transforming contact of the present invention includes contact body and contact stem two parts, described contact body is combined by welding manner with contact stem, in order to meet slider material good conductivity, good resistance fusion welding, resistance to electrical wear is good, contact resistance is low, condition that when being electrified for a long time, temperature rise is the highest and improve service life of electrical contact, and contact body part uses high-strength graphite to make；Contact stem part uses T2Y hard state red copper machine-shaping.
The welding method of heretofore described high voltage power transmission and transforming contact comprises the steps:
First described contact body is placed in sintering furnace before a, welding and is de-gassed process under conditions of 300 DEG C；And the surface to be welded of described contact stem is polished flat, dry standby after cleaning up with acetone；
B, at the faying face coating nickel-based solder of described contact body and described contact stem, afterwards the contact body assembled and contact stem are placed in weld jig, it is placed in vacuum drying oven, under conditions of vacuum is not less than 10-2Pa, heating rate Tr=10 K/min, brazing temperature T=1190～1300K, holding time of brazing t=10～15min, rate of temperature fall Td=4～10 K/min, carries out vacuum brazing；
C, described nickel-based solder granularity are the powdery nickel-based solder of-200 mesh, and the mass percent of chemical composition is: Cr:6.0～15.0%, B:0～3.5%, Si:0～9.0%, Fe:0～3.5%, C:0.06%, P:0.02～10.2%, and surplus is Ni；The xylene solution of described powdery nickel-based solder Yu polystyrene is uniformly mixed into paste by the mass fraction of 95:5.
Beneficial effects of the present invention is as follows:
Owing to graphite has the characteristic of superior shock resistance, high-melting-point, high heat conductance and self lubricity, the contact of high-strength graphite can be good at meeting the requirement of " good conductivity; good resistance fusion welding; resistance to electrical wear is good, and contact resistance is low, and when being electrified for a long time, temperature rise is the highest " needed for electrical contact switch, most importantly the arc resistant ablation property that graphite contact is excellent, and it is prone to processing, greatly reduce the cost of raw material, improve the service life of electrical contact；Using nickel-based solder vacuum brazing high-strength graphite and red copper, joint is attractive in appearance, and ratio of brazing area reaches more than 97%, meets the use requirement of electrical contact switch.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Sequence number in figure: 1 is contact body, 2 is contact stem, and 3 is weld seam.
Detailed description of the invention
The present invention closes and is further described below with reference to embodiment (accompanying drawing):
As shown in figure Fig. 1, the high voltage power transmission and transforming contact of the present invention includes contact body 1 and contact stem 2 two parts, described contact body 1 is combined by welding manner with contact stem 2, in order to meet slider material good conductivity, good resistance fusion welding, resistance to electrical wear is good, and contact resistance is low, condition that when being electrified for a long time, temperature rise is the highest and improve service life of electrical contact, contact body part uses ATJ-82 high-strength graphite to make；Contact stem part uses T2Y hard state red copper machine-shaping.
The welding method of heretofore described high voltage power transmission and transforming contact comprises the steps:
First described contact body is placed in sintering furnace before a, welding and is de-gassed process under conditions of 300 DEG C；And the surface to be welded of described contact stem is polished flat, dry standby after cleaning up with acetone；
B, at the faying face coating nickel-based solder of described contact body and described contact stem, afterwards the contact body assembled and contact stem are placed in weld jig, it is placed in vacuum drying oven, under conditions of vacuum is not less than 10-2Pa, heating rate Tr=10 K/min, brazing temperature T=1190～1300K, holding time of brazing t=10～15min, rate of temperature fall Td=4～10 K/min, carries out vacuum brazing；
C, described nickel-based solder granularity are the powdery nickel-based solder of-200 mesh, and the mass percent of chemical composition is: Cr:6.0～15.0%, B:0～3.5%, Si:0～9.0%, Fe:0～3.5%, C:0.06%, P:0.02～10.2%, and surplus is Ni；The xylene solution of described powdery nickel-based solder Yu polystyrene is uniformly mixed into paste by the mass fraction of 95:5.
The high-strength graphite of embodiment 1 Φ 25mm and T2The soldering of Y red copper bar
For vacuum brazing high-strength graphite and T2The nickel-based solder of Y red copper, its component and mass fraction be:
Cr 6.0
B 3.5
Si 4.2
Fe 2.5
C 0.06
P 0.02
Ni Surplus
Brazing temperature T=1300K, holding time of brazing t=15min.After testing, the high-strength graphite of Φ 25mm and T2Y red copper vacuum brazed joint ratio of brazing area is 98%.
The high-strength graphite of embodiment 2 Φ 20mm and T2The soldering of Y red copper bar
For vacuum brazing high-strength graphite and T2The nickel-based solder of Y red copper, its component and mass fraction be:
Cr 8.0
B 2.8
Si 4.5
Fe 0.5
C 0.06
P 0.02
Ni Surplus
Brazing temperature T=1300K, holding time of brazing t=15min.After testing, the high-strength graphite of Φ 20mm and T2Y red copper vacuum brazed joint ratio of brazing area is 97%.
The high-strength graphite of embodiment 3 Φ 8mm and T2The soldering of Y red copper bar
For vacuum brazing high-strength graphite and T2The nickel-based solder of Y red copper, its component and mass fraction be:
Cr 14.2
B —
Si —
Fe —
C 0.06
P 10.0
Ni Surplus
Brazing temperature T=1250K, holding time of brazing t=10min.After testing, the high-strength graphite of Φ 8mm and T2Y red copper vacuum brazed joint ratio of brazing area is 98%.

Claims (1)

1. a high voltage power transmission and transforming contact, it includes contact body and contact stem two parts, it is characterised in that: described contact body is combined by welding manner with contact stem, and described contact body is by high-strength graphite machine-shaping, and described contact stem is by T2Y hard state red copper machine-shaping；Concrete preparation process is as follows:
First described contact body is placed in sintering furnace before a, welding and is de-gassed process under conditions of 300 DEG C；And the surface to be welded of described contact stem is polished flat, dry standby after cleaning up with acetone；
B, at the faying face coating nickel-based solder of described contact body and described contact stem, afterwards the contact body assembled and contact stem are placed in weld jig, are placed in vacuum drying oven, are not less than 10 in vacuum-2Vacuum brazing is carried out under conditions of Pa, heating rate Tr=10 K/min, brazing temperature T=1190～1300K, holding time of brazing t=10～15min, rate of temperature fall Td=4～10 K/min；
C, described nickel-based solder granularity are the powdery nickel-based solder of-200 mesh, and the mass percent of chemical composition is: Cr:6.0～15.0%, B:0～3.5%, Si:0～9.0%, Fe:0～3.5%, C:0.06%, P:0.02～10.2%, and surplus is Ni；The xylene solution of described powdery nickel-based solder Yu polystyrene is uniformly mixed into paste by the mass fraction of 95:5.
CN201410408281.4A 2014-08-19 2014-08-19 A kind of high voltage power transmission and transforming contact and welding method thereof Active CN104117748B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1658713A (en) * 1923-10-30 1928-02-07 Gen Electric Electrical contact
EP0064191A1 (en) * 1981-04-27 1982-11-10 Siemens Aktiengesellschaft Compound material for electrical contacts, and method for its manufacture
CN101217075A (en) * 2007-12-26 2008-07-09 王益敏 A compound contact structure and manufacturing technology
WO2009041246A1 (en) * 2007-09-25 2009-04-02 A.L.M.T.Corp. Process for producing contact member, contact member, and switch
CN102024592A (en) * 2010-12-02 2011-04-20 江苏德春电力科技有限公司 Preparation technology for fixed contact

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5757419A (en) * 1980-09-20 1982-04-06 Nippon Oil Seal Ind Co Ltd Electric contact material
JPS6379925A (en) * 1986-09-20 1988-04-09 Sumitomo Electric Ind Ltd Electric contact material and its production
JPH0822727A (en) * 1994-07-06 1996-01-23 Omron Corp Electric contact
CN102275022B (en) * 2011-07-08 2013-06-26 中国科学院金属研究所 Connecting method of C/C composite material and copper or copper alloy
CN103223537B (en) * 2013-04-09 2015-03-11 武汉工程大学 Method for connecting high-strength graphite with copper alloy

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1658713A (en) * 1923-10-30 1928-02-07 Gen Electric Electrical contact
EP0064191A1 (en) * 1981-04-27 1982-11-10 Siemens Aktiengesellschaft Compound material for electrical contacts, and method for its manufacture
WO2009041246A1 (en) * 2007-09-25 2009-04-02 A.L.M.T.Corp. Process for producing contact member, contact member, and switch
CN101217075A (en) * 2007-12-26 2008-07-09 王益敏 A compound contact structure and manufacturing technology
CN102024592A (en) * 2010-12-02 2011-04-20 江苏德春电力科技有限公司 Preparation technology for fixed contact

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Address after: Fengyang high tech Industrial Development Zone, Henan province Zhengzhou city 450001 Street No. 10

Patentee after: Zhengzhou Machinery Research Institute Co., Ltd.

Address before: Fengyang high tech Industrial Development Zone, Henan province Zhengzhou city 450001 Street No. 10

Patentee before: Zhengzhou Research Institute of Mechanical Engineering

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