CN112824005B - High-conductivity heat-release welding powder suitable for being used in acid soil - Google Patents
High-conductivity heat-release welding powder suitable for being used in acid soil Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 75
- 239000000843 powder Substances 0.000 title claims abstract description 72
- 239000002689 soil Substances 0.000 title claims abstract description 17
- 239000002253 acid Substances 0.000 title claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 39
- 239000000956 alloy Substances 0.000 claims abstract description 39
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 21
- RRZKHZBOZDIQJG-UHFFFAOYSA-N azane;manganese Chemical compound N.[Mn] RRZKHZBOZDIQJG-UHFFFAOYSA-N 0.000 claims abstract description 19
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 18
- 239000011651 chromium Substances 0.000 claims abstract description 18
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000005751 Copper oxide Substances 0.000 claims abstract description 13
- 229910000431 copper oxide Inorganic materials 0.000 claims abstract description 13
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 12
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 9
- 239000011572 manganese Substances 0.000 claims abstract description 9
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 239000011733 molybdenum Substances 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract 2
- 238000003723 Smelting Methods 0.000 claims description 22
- 239000002994 raw material Substances 0.000 claims description 22
- 239000002893 slag Substances 0.000 claims description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 229910052758 niobium Inorganic materials 0.000 claims description 10
- 239000010955 niobium Substances 0.000 claims description 10
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 10
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 8
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 8
- 238000009692 water atomization Methods 0.000 claims description 8
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 7
- 239000010436 fluorite Substances 0.000 claims description 7
- 239000004579 marble Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims 2
- 230000000996 additive effect Effects 0.000 claims 2
- 238000007792 addition Methods 0.000 claims 1
- 238000005275 alloying Methods 0.000 claims 1
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 5
- 150000002910 rare earth metals Chemical class 0.000 abstract description 5
- 229940123973 Oxygen scavenger Drugs 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 10
- 230000007547 defect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 239000010935 stainless steel Substances 0.000 description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000001066 destructive effect Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229910000975 Carbon steel Inorganic materials 0.000 description 5
- 239000010962 carbon steel Substances 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 4
- 229910000679 solder Inorganic materials 0.000 description 4
- 206010070834 Sensitisation Diseases 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008313 sensitization Effects 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910021538 borax Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000004328 sodium tetraborate Substances 0.000 description 2
- 235000010339 sodium tetraborate Nutrition 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910001096 P alloy Inorganic materials 0.000 description 1
- PZKRHHZKOQZHIO-UHFFFAOYSA-N [B].[B].[Mg] Chemical compound [B].[B].[Mg] PZKRHHZKOQZHIO-UHFFFAOYSA-N 0.000 description 1
- RIRXDDRGHVUXNJ-UHFFFAOYSA-N [Cu].[P] Chemical compound [Cu].[P] RIRXDDRGHVUXNJ-UHFFFAOYSA-N 0.000 description 1
- 238000007133 aluminothermic reaction Methods 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910001610 cryolite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002887 superconductor Substances 0.000 description 1
- 239000003832 thermite Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- 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
- B23K35/302—Cu as the principal constituent
-
- 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
- B23K23/00—Alumino-thermic welding
-
- 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
- B23K35/34—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material comprising compounds which yield metals when heated
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
A high-conductivity exothermic welding powder suitable for being used in acid soil comprises the following components in parts by weight: copper oxide: 15-20 parts of aluminum powder: 20-25 parts of copper powder: 35-50 parts of alloy powder: 5-15 parts of molybdenum: 3-8 parts of an oxygen scavenger: 1-2 parts of slagging agent and 1-2 parts of rare earth, wherein the weight percentage of chromium in the alloy powder is 25-35%, the weight percentage of manganese is 20-25%, the weight percentage of manganese nitride is 15-25%, and the balance is aluminum.
Description
Technical Field
The invention relates to the technical field of welding, in particular to high-conductivity heat-release welding powder suitable for being used in acid soil.
Background
In order to protect the safety of workers, transformers are generally grounded through a grounding net, and various novel grounding net materials are developed in China in order to obtain higher conductivity and corrosion resistance and from the viewpoint of environmental protection. For example, the institute of Electrical and Electrical sciences in China developed a novel corrosion-resistant steel-stainless steel clad steel composite material. The stainless steel clad steel is made up by using two portions of high-quality carbon steel special-purpose wire material and special-made special-purpose stainless steel tube, and adopting special process and technology. The base material of the stainless steel clad steel is high-quality carbon steel, the base material of the hot galvanizing round steel is common carbon steel, the physical properties of the high-quality carbon steel are greatly superior to those of the common carbon steel, and particularly, the material is low in resistivity and strong in impact resistance. In addition, the stainless steel ladle steel is completely produced and manufactured by adopting a physical process, and a chemical process is completely avoided, so that secondary pollution to the atmosphere, water and soil is avoided, and the requirement of second type of normalization (environment-friendly type) of national grid companies is completely met.
The Chinese patent with publication number CN104043913B discloses an aluminothermic welding powder for welding a novel grounding grid material, which consists of the following substances in percentage by weight: 45-60% of copper oxide, 8-13% of aluminum powder, 20-30% of copper powder, 5-15% of copper-phosphorus alloy powder, 1-5% of tin powder, 2-6% of fluorite powder, 1-4% of borax powder and the balance of alloy powder; the alloy powder consists of the following substances in percentage by weight: ca: 8-12%, Si: 40-47%, Ba: 28-32 percent and the balance of impurities, the raw materials are cheap and easy to obtain, the problems of air holes, slag inclusion, heat cracking and the like easily caused by the welding of the thermite welding powder are solved, the connection cost of the novel grounding net material is effectively reduced, but the electric conductivity is low (when the content of tin powder is more than 1 percent, the electric conductivity of copper is greatly reduced).
The Chinese patent with publication number CN108326466A discloses a high-conductivity aluminothermic welding powder, which comprises the following components in parts by weight: 165 parts of 135-55 parts of aluminum powder, 35-55 parts of magnesium powder, 300 parts of 260-550 parts of copper powder, 550 parts of 500-550 parts of copper oxide powder, 5-15 parts of lithium fluoride, 20-40 parts of borax, 4-10 parts of cryolite, 2-5 parts of rare earth, 1-5 parts of copper alloy, 5-10 parts of magnesium diboride and 2-6 parts of boron slag, and after the welding powder is adopted for welding, the welding part has good conductivity but poor corrosion resistance, and is not suitable for being used in acid soil such as acid soil: in the weld seam front layer of a weld seam of stainless steel such as common Cr18Ni8 steel, when a weld seam heat affected zone reaches a sensitization temperature region (600-.
Disclosure of Invention
In view of the above, the present invention aims to provide a high-conductivity heat-releasing welding powder suitable for use in acid soil, and a stainless steel grounding grid welded by using the welding powder is not easy to corrode in acid soil, and the conductivity is not affected by the welded part.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-conductivity exothermic welding powder suitable for being used in acid soil comprises the following components in parts by weight: copper oxide: 15-20 parts of aluminum powder: 20-25 parts of copper powder: 35-50 parts of alloy powder: 5-15 parts of molybdenum: 3-8 parts of an oxygen scavenger: 1-2 parts of slag former, 1-2 parts of rare earth, 25-35% of chromium, 20-25% of manganese, 15-25% of manganese nitride and the balance of aluminum in the alloy powder.
Further, the granularity of the copper oxide is 70-90 meshes, the granularity of the aluminum powder is 70-90 meshes, the granularity of the copper powder is 70-90 meshes, the granularity of the alloy powder is 50-70 meshes, the granularity of the molybdenum is 50-70 meshes, the granularity of the oxygen scavenger is 200-250 meshes, the granularity of the slag former is 100-150 meshes, and the granularity of the rare earth is 150-200 meshes.
Further, the rare earth is niobium.
Further, the oxygen scavenger is ferrosilicon.
Further, the slag former is rutile, fluorite and marble or the slag former is one or more of rutile, fluorite and marble;
further, the preparation method of the alloy powder comprises the following steps:
step one, preparing alloy powder raw materials: putting aluminum, chromium, manganese and manganese nitride into a crucible, and putting the crucible into a smelting furnace to be smelted under the protection of argon;
and step two, after the smelting is finished, the smelted raw materials flow to an atomizing chamber through a flow guide pipe at the bottom of the crucible to be subjected to gas-water atomization treatment, and alloy powder is obtained.
The exothermic welding is a simple, high-efficiency and high-quality metal connecting process, it uses the chemical reaction heat of metal compound as heat source to heat the metal to be in molten state to realize the combination between the welding parts, the temperature is higher during welding, the chemical reaction is violent, the welding flux is easy to spray and splash to the surrounding environment, therefore, the solder is required to be arranged, so that the solder components can not react at high temperature to generate toxic and harmful substances, otherwise, the toxic and harmful substances can damage the bodies of welding personnel who work for welding for a long time, aluminum and manganese nitride can react at high temperature to generate aluminum nitride, the aluminum nitride has strong corrosiveness, has strong stimulation effect on the skin and eyes of human body, and the aluminum nitride belongs to atomic crystal, covalent bond compound and non-conducting property, it is not helpful to improve the conductivity of the solder joint, so those skilled in the art would not easily think of adding aluminum and manganese nitride simultaneously into the exothermic solder powder of the soldered grounding grid.
The invention has the beneficial effects that:
1. under the condition of high temperature, aluminum powder and copper oxide are subjected to aluminothermic reaction to displace copper, a large amount of heat is released in a short time to completely melt solid copper into liquid, according to the principle that the melting point of the alloy is smaller than that of component metals, the melting point of copper is larger than that of aluminum, and the alloy contains aluminum, so that when the copper is in the liquid state, the alloy powder is also in the liquid state, and the existence of a slag former can increase the fluidity and stability of the liquid metal and ensure the welding effect; the existence of molybdenum can increase the toughness of the welding position on one hand, prevent that the welding position from splitting easily when the grounding grid is deformed, and on the other hand can compensate the defect that the generated aluminum nitride reduces the conductivity of the welding position, improve the conductivity of the whole welding position, and reduce the step voltage of the grounding grid.
2. The alloy powder also contains more chromium, when the heat affected zone of the welding seam reaches a sensitization temperature area (600-; the alloy powder contains manganese, and plays roles in desulfurization, deoxidation and weld joint strength improvement; niobium is not only a good superconductor, but also can be used as a stabilizing element to prevent sensitization of the welding position and increase corrosion resistance.
3. The chemical affinity between silicon and oxygen is very high under the high temperature condition, so that the oxygen in the welding slag can be effectively removed, and pores in the welding slag are prevented.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Firstly, preparing alloy powder, wherein the preparation method comprises the following steps:
step one, preparing raw materials of 5 parts of alloy powder: aluminum, chromium, manganese and manganese nitride are filled into a crucible, the raw materials comprise 25 weight percent of chromium, 20 weight percent of manganese, 15 weight percent of manganese nitride and the balance of aluminum, and are placed into a smelting furnace to be smelted for 20min under the protection of argon, and the smelting temperature is 1860 ℃;
and step two, after the smelting is finished, the smelted raw materials flow to an atomizing chamber through a flow guide pipe at the bottom of the crucible to be subjected to gas-water atomization treatment, and alloy powder is obtained.
Then uniformly mixing the following components in parts by weight: 15 parts of copper oxide with the granularity of 70 meshes; 20 parts of aluminum powder with the granularity of 70 meshes; 20 parts of copper powder with the granularity of 50 meshes; 5 parts of alloy powder with the granularity of 50 meshes, and 3 parts of molybdenum powder with the granularity of 50 meshes; 1 part of ferrosilicon with the granularity of 200 meshes; 1 part of rutile, the granularity is 100 meshes; 1 part of niobium with the granularity of 150 meshes, and the welding powder is prepared after the mixing is finished.
After welding by using the welding powder, no welding defects such as air holes, slag inclusion, non-welding, cracks and the like exist on the welding surface, the hardness of the welding part is 259HB, the maximum destructive power is 33.2kN, the resistance is 0.03 omega, and no corrosion phenomenon occurs in acid soil for 4 years.
Example two
Firstly, preparing alloy powder, wherein the preparation method comprises the following steps:
step one, preparing raw materials of 15 parts of alloy powder: aluminum, chromium, manganese and manganese nitride are filled into a crucible, the raw materials comprise 35 weight percent of chromium, 25 weight percent of manganese nitride and the balance of aluminum, and are placed into a smelting furnace to be smelted for 20min under the protection of argon, and the smelting temperature is 1860 ℃;
and step two, after the smelting is finished, the smelted raw materials flow to an atomizing chamber through a flow guide pipe at the bottom of the crucible to be subjected to gas-water atomization treatment, and powder is obtained.
Then uniformly mixing the following components in parts by weight: 20 parts of copper oxide with the granularity of 90 meshes; 25 parts of aluminum powder with the granularity of 90 meshes; 50 parts of copper powder with the granularity of 90 meshes; 15 parts of alloy powder with the granularity of 70 meshes, and 8 parts of molybdenum powder with the granularity of 70 meshes; 2 parts of ferrosilicon with the granularity of 250 meshes; 2 parts of fluorite with the granularity of 150 meshes; 2 parts of niobium with the granularity of 200 meshes, and the welding powder is prepared after the mixing is finished.
After the welding is finished by adopting the welding powder, no welding defects such as air holes, slag inclusion, non-welding, cracks and the like exist on the welding surface, the hardness of the welding position is measured to be 316HB, the maximum destructive power is 40.6kN, the resistance is 0.008 omega, and no corrosion phenomenon occurs in acid soil for 4 years.
EXAMPLE III
Firstly, preparing alloy powder, wherein the preparation method comprises the following steps:
step one, taking 10 parts of alloy powder as raw materials: aluminum, chromium, manganese and manganese nitride are filled into a crucible, the raw materials comprise 30 weight percent of chromium, 28 weight percent of manganese, 20 weight percent of manganese nitride and the balance of aluminum, and are placed into a smelting furnace to be smelted for 20min under the protection of argon, and the smelting temperature is 1860 ℃;
and step two, after the smelting is finished, the smelted raw materials flow to an atomizing chamber through a flow guide pipe at the bottom of the crucible to be subjected to gas-water atomization treatment, and powder is obtained.
Then uniformly mixing the following components in parts by weight: 18 parts of copper oxide with the granularity of 70 meshes; 23 parts of aluminum powder with the granularity of 70 meshes; 45 parts of copper powder with the granularity of 70 meshes; 10 parts of alloy powder with the granularity of 50 meshes, and 8 parts of molybdenum powder with the granularity of 50 meshes; 2 parts of ferrosilicon with the granularity of 200 meshes; 2 parts of fluorite with the granularity of 100 meshes; 2 parts of niobium with the granularity of 150 meshes, and the welding powder is prepared after the mixing is finished.
After welding by adopting the welding powder, no welding defects such as air holes, slag inclusion, non-welding, cracks and the like exist on the welding surface, the hardness of the welding position is measured to be 302HB, the maximum destructive power is 38.9kN, the resistance is 0.01 omega, and no corrosion phenomenon occurs in acid soil for 4 years.
Example four
Firstly, preparing alloy powder, wherein the preparation method comprises the following steps:
step one, preparing raw materials of 5 parts of alloy powder: aluminum, chromium, manganese and manganese nitride are filled into a crucible, the raw materials comprise 29 weight percent of chromium, 26 weight percent of manganese, 21 weight percent of manganese nitride and the balance of aluminum, and are placed into a smelting furnace to be smelted for 20min under the protection of argon, and the smelting temperature is 1860 ℃;
and step two, after the smelting is finished, the smelted raw materials flow to an atomizing chamber through a flow guide pipe at the bottom of the crucible to be subjected to gas-water atomization treatment, and powder is obtained.
Then uniformly mixing the following components in parts by weight: 15 parts of copper oxide with the granularity of 90 meshes; 20 parts of aluminum powder with the granularity of 90 meshes; 35 parts of copper powder with the granularity of 90 meshes; 5 parts of alloy powder with the granularity of 70 meshes and 3 parts of molybdenum powder with the granularity of 60 meshes; 1 part of ferrosilicon with the granularity of 250 meshes; 1 part of fluorite with the granularity of 150 meshes; 1 part of niobium with the granularity of 200 meshes, and the welding powder is prepared after the mixing is finished.
After welding is finished by adopting the welding powder, welding defects such as air holes, slag inclusion, non-welding, cracks and the like are not found on the welding surface, the hardness of the welding part is 286HB, the maximum destructive power is 26.3kN, the resistance is 0.05 omega, and the phenomenon of corrosion does not occur in acid soil for 4 years.
EXAMPLE five
Firstly, preparing alloy powder, wherein the preparation method comprises the following steps:
step one, preparing raw materials of 15 parts of alloy powder: aluminum, chromium, manganese and manganese nitride are filled into a crucible, the raw materials comprise 28 weight percent of chromium, 21 weight percent of manganese, 19 weight percent of manganese nitride and the balance of aluminum, and are placed into a smelting furnace to be smelted for 20min under the protection of argon, and the smelting temperature is 1860 ℃;
and step two, after the smelting is finished, the smelted raw materials flow to an atomizing chamber through a flow guide pipe at the bottom of the crucible to be subjected to gas-water atomization treatment, and powder is obtained.
Then uniformly mixing the following components in parts by weight: 16 parts of copper oxide with the granularity of 80 meshes; 23 parts of aluminum powder with the granularity of 80 meshes; 50 parts of copper powder with the granularity of 80 meshes; 12 parts of alloy powder with the granularity of 80 meshes, and 5 parts of molybdenum powder with the granularity of 50 meshes; 1.5 parts of ferrosilicon with the granularity of 230 meshes; 1 part of marble with the granularity of 120 meshes; 1.3 parts of niobium with the granularity of 180 meshes, and the welding powder is prepared after the mixing is finished.
After welding by using the welding powder, no welding defects such as air holes, slag inclusion, non-welding, cracks and the like exist on the welding surface, the hardness of the welding position is measured to be 321HB, the maximum destructive power is 33.4kN, the resistance is 0.01 omega, and no corrosion phenomenon occurs in acid soil for 4 years.
EXAMPLE six
Firstly, preparing alloy powder, wherein the preparation method comprises the following steps:
step one, preparing 11 parts of alloy powder: aluminum, chromium, manganese and manganese nitride are filled into a crucible, the raw materials comprise 29 weight percent of chromium, 24 weight percent of manganese, 25 weight percent of manganese nitride and the balance of aluminum, and are placed into a smelting furnace to be smelted for 20min under the protection of argon, and the smelting temperature is 1860 ℃;
and step two, after the smelting is finished, the smelted raw materials flow to an atomizing chamber through a flow guide pipe at the bottom of the crucible to be subjected to gas-water atomization treatment, and powder is obtained.
Then uniformly mixing the following components in parts by weight: 17 parts of copper oxide with the granularity of 70 meshes; 22 parts of aluminum powder with the granularity of 80 meshes; 44 parts of copper powder with the granularity of 80 meshes; 11 parts of alloy powder with the granularity of 70 meshes and 7 parts of molybdenum powder with the granularity of 60 meshes; 1.8 parts of ferrosilicon with the granularity of 230 meshes; 1.7 parts of marble with the granularity of 120 meshes; 1.8 parts of niobium with the granularity of 190 meshes, and the welding powder is prepared after the mixing is finished.
After welding by adopting the welding powder, no welding defects such as air holes, slag inclusion, non-welding, cracks and the like exist on the welding surface, the hardness of the welding position is measured to be 312HB, the maximum destructive power is 30.2kN, the resistance is 0.02 omega, and no corrosion phenomenon occurs in acid soil for 4 years.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (2)
1. The high-conductivity exothermic welding powder is characterized by comprising the following components in parts by weight: copper oxide: 15-20 parts of aluminum powder: 20-25 parts of copper powder: 35-50 parts of alloy powder: 5-15 parts of molybdenum: 3-8 parts of ferrosilicon: 1-2 parts of slagging agent and 1-2 parts of niobium, wherein the alloy additive powder comprises 25-35% of chromium, 20-25% of manganese, 15-25% of manganese nitride and the balance of aluminum; the slag former is one or more of rutile, fluorite and marble;
the granularity of the copper oxide is 70-90 meshes, the granularity of the aluminum powder is 70-90 meshes, the granularity of the copper powder is 70-90 meshes, the granularity of the alloy powder is 50-70 meshes, the granularity of the molybdenum is 50-70 meshes, the granularity of the ferrosilicon is 200-250 meshes, the granularity of the slag former is 100-150 meshes, and the granularity of the niobium is 150-200 meshes.
2. A highly conductive exothermic welding powder suitable for use in acid soil according to claim 1, wherein the alloying additions powder is prepared by a method comprising the steps of:
step one, raw materials of alloy powder: putting aluminum, chromium, manganese and manganese nitride into a crucible, and putting the crucible into a smelting furnace to be smelted under the protection of argon;
and step two, after the smelting is finished, the smelted raw materials flow to an atomizing chamber through a flow guide pipe at the bottom of the crucible to be subjected to gas-water atomization treatment, and alloy additive powder is obtained.
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| GB797579A (en) * | 1955-12-20 | 1958-07-02 | Erico Prod Inc | Welding process and an exothermic reaction mixture for it |
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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 |
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