CN101412167B - Thermofusion welding agent for welding copper covered steel grounded screen - Google Patents
Thermofusion welding agent for welding copper covered steel grounded screen Download PDFInfo
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- CN101412167B CN101412167B CN2008102276909A CN200810227690A CN101412167B CN 101412167 B CN101412167 B CN 101412167B CN 2008102276909 A CN2008102276909 A CN 2008102276909A CN 200810227690 A CN200810227690 A CN 200810227690A CN 101412167 B CN101412167 B CN 101412167B
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Abstract
The invention provides a hot-melt welding flux for copper-clad steel grounding net welding, which belongs to the field of metal welding. The prior hot-melt welding flux for copper-clad steel grounding net welding has the problems of violent reaction, huge heat release, high noise, poor corrosion resistance and the like. The hot-melt welding flux consists of hot-melt solder and detonator, wherein the hot-melt solder consists of the following materials in weight percentage: 30 to 40 percent of copper oxide powder, 8 to 11 percent of metal aluminum powder, 20 to 35 percent of metal copper powder, 5 to 10 percent of fluorite powder, 4 to 10 percent of tin powder and 5 to 10 percent of nickel powder. The hot-melt welding flux has the advantages of proper reaction speed, low heat release, low noise, good corrosion resistance and the like.
Description
Technical field
The invention belongs to the metal solder field, be specifically related to a kind of hot melt scolder, detonator of copper covered steel grounded screen joint welding usefulness and the Thermofusion welding agent of forming by hot melt scolder and detonator.
Background technology
Along with the continuous development of national economy, to the demand increase of electric power, the power grid construction paces are accelerated, and newly-increased circuit is on the increase.In power transmission network, the earthing or grounding means of each transformer station, electric power pylon, power plant etc. is just obtaining everybody and is paying attention to widely, and its construction quality not only is related to the security of operation of substantial equipment in the electrical network, also is related to operation power personnel's personal safety.Good as a kind of corrosion resistance, with low cost earthing material, copper covered steel composite just are being generalized in the application of grounded screen widely.
Because grounded screen is laid the environment many places in open-air remote districts, environment is comparatively abominable, and traditional arc welding, gas welding are limited by the restriction that the welding equipment transportation is carried more.Heat release welding technology (exothermic welding) is because of having simple, the small investment of equipment, and weld job soon, does not need large power supply, characteristics such as simple to operate, and is applicable to the welding of grounded screen joint.
At specific copper covered steel composite, adopt exothermic welding to weld, the key of its welding quality depends on hot melt scolder and the supporting Thermofusion welding agent that detonator constituted.Disclose a kind of welding compound as patent CN1069215A, described welding compound is the hot melt scolder with powder such as cupric oxide powder, metallic aluminium powder, metallic copper powder, calcirm-fluoride powder, silico-calciums; With magnesium metal powder, potassium bichromate or potassium chlorate, metallic copper powder, red phosphorus powder is detonator; The mass ratio of hot melt scolder and detonator is 10～20:1.The deficiency of this technology is: hot melt scolder and detonator ratio only are 10～20:1, and detonator efficient is lower.Patent CN1559745A provides a kind of constituting: the hot melt scolder of cupric oxide powder 50～60%, metallic copper powder 20～30%, metallic aluminium powder 10～20%, fluorite powder 5～6.5%, zinc powder 0.5～2% and tin powder 1～2.5%.This technology has following deficiency, and at first zinc, tin powder are mixed altogether, and by the Sn-Zn phasor as can be known, two kinds of elements can form eutectic structure, and its corrosion resistance is poor, in being on active service, the grounded screen joint should can at first corrode by tissue, and formation microvoid hole, what cause corroding further expands.Secondly, because cupric oxide and metallic copper powder population proportion are big, reaction is violent, and heat release is big, and noise is big.
Summary of the invention
The object of the present invention is to provide a kind of Thermofusion welding agent for welding copper covered steel grounded screen, defective such as the efficient of igniting that existing Thermofusion welding agent exists is low, corrosion resistance is poor to overcome, welding heat height, welding noise are big.
Thermofusion welding agent for welding copper covered steel grounded screen provided by the present invention is made of hot melt scolder and detonator, and wherein, the component of described hot melt scolder and percentage by weight thereof are:
Cupric oxide powder 30～40%
Metallic aluminium powder 8～11%
Metallic copper powder 20～35%
Fluorite powder 5～10%
Glass putty 4～10%
Nickel powder 5～10%
The principle of heat release welding technology is that redox reaction (3CuO+2Al=3Cu+Al takes place between applied metal aluminium and the cupric oxide
2O
3), emit a large amount of heats, produce sufficiently high temperature, make welding position metal and relevant auxiliary materials fusion reach welding effect.
Cupric oxide (CuO) powder and metallic aluminium powder (Al): being the key ingredient of redox reaction, is the thermal source in the reaction, and the two shared percentage by weight plays the effect of conditioned reaction temperature, welding noise and optical heat radiation in the hot melt scolder.The interpolation total amount of the two is advisable to guarantee the complete fusion of metal, and too much interpolation reaction is violent, noise is big, heat release is big.In the hot melt scolder of the present invention, the percentage by weight sum of cupric oxide powder and metallic aluminium powder should be less than 50%.
Cupric oxide powder: be main oxidant, preferred size is 100～200 purpose cupric oxide powders among the present invention, and simultaneously preferred oxidizability is the cupric oxide powder more than 95%.
Metallic aluminium powder: outside the reducing agent reductive copper oxide, also play the effect of removing pad place oxide on surface, so the metallic aluminium powder is excessive slightly.The granule size of metallic aluminium powder influences the speed of redox reaction in addition, and reaction speed is too fast, and noise is big, optical heat radiation is violent, it is many to splash; Reacted slow, that heat scatters and disappears is many, reduction solder flux efficient, Thermofusion welding agent addition are big.Preferred size is 100～200 purpose metallic aluminium powder among the present invention.
Metallic copper powder (Cu): be the main component of weld metal, in the copper covered steel grounded screen welding, mainly play the conducting effect, the metallic copper powder all melts in exothermic process.Preferred size is 60 purpose metallic copper powder among the present invention, and simultaneously preferred purity is not less than 99% metallic copper powder.
Fluorite (CaF
2) powder: be the main slag former in the reaction, play the effect of the slag making of fluxing, elimination pore, the adding of fluorite powder can increase molten metal flow, helps the eliminating of gas.
Glass putty and nickel powder (Sn/Ni): mainly acting as of glass putty increases molten metal flow, and generates intermetallic compound with Ni and Cu reaction, and the intensity of reinforced metal weld seam reduces reaction temperature, and this is will put the place among the present invention.
Because the reaction of Cu-Ni-Sn can be carried out at a lower temperature, so because the interpolation of Ni and Sn, the deposite metal copper powders may does not then need a large amount of reductant-oxidants, therefore can reduce the addition of metallic aluminium and cupric oxide.The Cu-Ni-Sn intermetallic compound is a kind of intensity height and the tiny particle of disperse in addition, can play the effect of strengthen welds in tissue, the results showed, because the interpolation intensity of Ni particle can improve 20%.The interpolation of Ni powder requires relatively stricter, and preferable particle size was the nickel powder of 2～3 μ m during this law was bright.The ratio of glass putty is unsuitable excessive, and too much glass putty can generate too much Cu
6Sn
5Intermetallic compound causes the toughness of weld metal to descend.
The mass ratio of hot melt scolder and detonator is 50～55:1 in the described Thermofusion welding agent.
Compared with prior art, the present invention has following beneficial effect:
1) added nickel powder and glass putty in the bright melting welding scolder of this law, two kinds of common and metallic copper powder reactions of powder generate high-intensity dispersion-strengtherning particle, have improved the intensity of weld metal.
2) because the reaction of nickel powder, glass putty and metallic copper powder can reduce the heat exhaustion that needs the deposite metal copper powders may in the welding, so only need total amount can weld at cupric oxide below 50% and metallic aluminium powder, reaction speed is suitable, and heat release is little, noise is low.
3) the postwelding metal ingredient is the Cu alloy that Cu-Ni-Sn disperse compound is strengthened, so strength of joint height, corrosion resistance are good.
4) Thermofusion welding agent of the present invention can ignite with lighter, need not special installation, and reaction can be finished within several seconds, and can cool off rapidly, can be widely used in the copper covered steel grounded screen welding of power plant, transformer station etc.
The invention will be further described below in conjunction with the specific embodiment.
The specific embodiment
The oxidizability of employed cupric oxide powder is 96% among the following embodiment, and the purity of metallic copper powder is not less than 99%.
Embodiment 1
Thermofusion welding agent for welding copper covered steel grounded screen is made of hot melt scolder and detonator, and the mass ratio of hot melt scolder and detonator is: 50:1;
The component of hot melt scolder and percentage by weight thereof are:
Cupric oxide powder (100 order) 30%
Metallic aluminium powder (100 order) 8%
Metallic copper powder (60 order) 35%
Fluorite powder (100 order) 7%
Glass putty (100 order) 10%
Nickel powder (2～3 microns of particle diameters) 10%
The component of detonator and percentage by weight thereof are:
Potassium permanganate (100 order) 15%
Cupric oxide powder (100 order) 35%
Metallic aluminium powder (100 order) 10%
Metal magnesium powder (100 order) 25%
Red phosphorus powder (100 order) 15%.
Embodiment 2
Thermofusion welding agent for welding copper covered steel grounded screen is made of hot melt scolder and detonator, and the mass ratio of hot melt scolder and detonator is: 55:1;
The component of hot melt scolder and percentage by weight thereof are:
Cupric oxide powder (200 order) 40%
Metallic aluminium powder (200 order) 11%
Metallic copper powder (60 order) 20%
Fluorite powder (100 order) 10%
Glass putty (100 order) 4%
Nickel powder (2～3 microns of particle diameters) 5%
The component of detonator and percentage by weight thereof are:
Potassium permanganate (100 order) 10%
Cupric oxide powder (200 order) 40%
Metallic aluminium powder (200 order) 15%
Metal magnesium powder (100 order) 25%
Red phosphorus powder (100 order) 10%
Embodiment 3
Thermofusion welding agent for welding copper covered steel grounded screen is made of hot melt scolder and detonator, and the mass ratio of hot melt scolder and detonator is: 52:1;
The component of hot melt scolder and percentage by weight thereof are:
Cupric oxide powder (150 order) 35%
Metallic aluminium powder (150 order) 10%
Metallic copper powder (60 order) 30%
Fluorite powder (100 order) 9%
Glass putty (100 order) 9%
Nickel powder (2～3 microns of particle diameters) 7%
The component of detonator and percentage by weight thereof are:
Potassium permanganate (100 order) 14%
Cupric oxide powder (150 order) 36%
Metallic aluminium powder (150 order) 10%
Metal magnesium powder (150 order) 28%
Red phosphorus powder (150 order) 12%
Claims (7)
1. a Thermofusion welding agent for welding copper covered steel grounded screen is made of hot melt scolder and detonator, and the mass ratio of hot melt scolder and detonator is 50～55: 1, it is characterized in that, the component of described hot melt scolder and percentage by weight thereof are:
Cupric oxide powder 30～40%
Metallic aluminium powder 8～11%
Metallic copper powder 20～35%
Fluorite powder 5～10%
Glass putty 4～10%
Nickel powder 5～10%
In the hot melt scolder, the percentage by weight sum of cupric oxide powder and metallic aluminium powder is less than 50%.
2. Thermofusion welding agent for welding copper covered steel grounded screen according to claim 1 is characterized in that, the granularity of described cupric oxide powder is 100～200 orders.
3. Thermofusion welding agent for welding copper covered steel grounded screen according to claim 1 and 2 is characterized in that, the oxidizability of described cupric oxide powder is more than 95%.
4. Thermofusion welding agent for welding copper covered steel grounded screen according to claim 1 is characterized in that, the granularity of described metallic aluminium powder is 100～200 orders.
5. Thermofusion welding agent for welding copper covered steel grounded screen according to claim 1 is characterized in that, the granularity of described metallic copper powder is 60 orders.
6. Thermofusion welding agent for welding copper covered steel grounded screen according to claim 1 or 5 is characterized in that the purity of described metallic copper powder is not less than 99.0%.
7. Thermofusion welding agent for welding copper covered steel grounded screen according to claim 1 is characterized in that, the particle diameter of described nickel powder is 2～3 microns.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102276909A CN101412167B (en) | 2008-11-28 | 2008-11-28 | Thermofusion welding agent for welding copper covered steel grounded screen |
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|---|---|---|---|
| CN2008102276909A CN101412167B (en) | 2008-11-28 | 2008-11-28 | Thermofusion welding agent for welding copper covered steel grounded screen |
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| CN101412167A CN101412167A (en) | 2009-04-22 |
| CN101412167B true CN101412167B (en) | 2011-01-26 |
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| CN101745756B (en) * | 2009-12-18 | 2012-08-22 | 西安杰邦科技有限公司 | Molecular environment-friendly heat-release welding agent applicable to welding of copper conductor |
| CN102528312A (en) * | 2012-02-15 | 2012-07-04 | 哈尔滨工业大学 | Solder for exothermal soldering of railway track joint, igniting agent and soldering method |
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| CN103639613B (en) * | 2013-12-12 | 2017-02-22 | 国家电网公司 | Heat-releasing welding flux for iron-base copper-clad steel grounding grid |
| CN103894755B (en) * | 2014-03-13 | 2016-01-20 | 哈尔滨工业大学 | A kind of iron that is used for puts heat weldable solder and detonator thereof |
| CN104043913B (en) * | 2014-06-24 | 2016-05-25 | 国家电网公司 | A kind of aluminothermy welding powder for novel grounded net materials welding |
| WO2017030554A1 (en) * | 2015-08-17 | 2017-02-23 | Halliburton Energy Services, Inc. | Attachment of polycrystalline diamond tables to a substrate to form a pcd cutter using reactive/exothermic process |
| CN105149862B (en) * | 2015-10-21 | 2017-10-03 | 武汉大学 | A kind of restorative procedure for being broken defect bronze relic |
| CN108672978B (en) * | 2018-05-23 | 2020-08-18 | 江苏银锐通电工设备有限公司 | Aluminothermic welding powder, preparation process and use method thereof |
| CN110814577A (en) * | 2019-11-16 | 2020-02-21 | 国网河南省电力公司电力科学研究院 | Exothermic fusion brazing welding powder suitable for copper-clad steel grounding grid in dry-wet alternating environment |
| CN112077481A (en) * | 2020-08-27 | 2020-12-15 | 北京市金合益科技发展有限公司 | Formula of welding powder for welding flat-belt type copper-coated steel grounding body |
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| RU2054347C1 (en) * | 1993-10-29 | 1996-02-20 | Научно-производственное предприятие "Кварц" | Bombs composition (variants) |
| RO113223B1 (en) * | 1997-11-10 | 1998-05-29 | Terotehnica Romana Sa | Thermite for copper welding |
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| CN101143412A (en) * | 2007-08-16 | 2008-03-19 | 黄丽丽 | Hot melt welding agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2363520B1 (en) * | 1973-12-20 | 1974-11-28 | Th. Goldschmidt Ag, 4300 Essen | Aluminothermic reaction mixture based on copper oxide |
| RU2054347C1 (en) * | 1993-10-29 | 1996-02-20 | Научно-производственное предприятие "Кварц" | Bombs composition (variants) |
| RO113223B1 (en) * | 1997-11-10 | 1998-05-29 | Terotehnica Romana Sa | Thermite for copper welding |
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| CN101412167A (en) | 2009-04-22 |
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Effective date of registration: 20111229 Address after: 100192 Beijing city Haidian District Qinghe small Camp Road No. 15 Co-patentee after: Jinhua Power Industry Bureau Patentee after: China Electric Power Research Institute Address before: 100055 Beijing city Xuanwu District Guang'an South Binhe Road No. 33 Patentee before: China Electric Power Research Institute |