CN111633289B - End welding treatment method for round copper stranded wire of electric locomotive transformer - Google Patents
End welding treatment method for round copper stranded wire of electric locomotive transformer Download PDFInfo
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- CN111633289B CN111633289B CN202010326289.1A CN202010326289A CN111633289B CN 111633289 B CN111633289 B CN 111633289B CN 202010326289 A CN202010326289 A CN 202010326289A CN 111633289 B CN111633289 B CN 111633289B
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- 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
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- 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
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- 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
- B23K1/203—Fluxing, i.e. applying flux onto surfaces
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- 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
- B23K35/40—Making wire or rods for soldering or welding
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
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Abstract
The invention discloses a method for welding the end of a round copper stranded wire for an electric locomotive transformer, belonging to the technical field of processing and manufacturing of copper connecting pieces for track traffic electric locomotive transformers. The annealed copper pipe is firstly pressed and then welded to the end of the round copper stranded wire, so that the end of the round copper stranded wire forms a plane with a certain size. The method comprises the following specific steps: screening copper pipes, annealing the copper pipes, presetting sheet solder, crimping, welding and machining. Because the round copper stranded wire is limited by the structure, the round copper stranded wire is difficult to be directly brazed with a copper bar, and the round copper stranded wire is treated by the method, so that the problem is effectively solved, the operability is better, and the yield is higher.
Description
Technical Field
The invention belongs to the technical field of processing and manufacturing of copper connecting pieces for track traffic electric locomotive transformers, and particularly relates to a method for welding ends of round copper stranded wires for electric locomotive transformers.
Background
In the transformer of the rail transit electric locomotive, a round copper stranded wire is used as a connecting piece and needs to be welded with a copper plate, a copper rod and the like. However, the round copper stranded wire is twisted by a plurality of copper wires and has a round section, and the end is easy to loosen after the round copper stranded wire is cut off, so that the round copper stranded wire is difficult to be directly brazed with a copper plate or a copper bar, the yield is low, and the round copper stranded wire end is directly welded with the copper plate, so that the joint strength is low and the safety is poor.
Therefore, it is necessary to directly braze the round copper stranded wire ends with sleeves to the copper plate or the copper bar. When the existing round copper stranded wire end sleeve is lapped and brazed with a copper plate or a copper bar, the overall yield and production efficiency are low; the binding force between the copper sleeve and the round copper stranded wire is low, the joint strength is poor, and the safety and reliability cannot be guaranteed; meanwhile, the common welding wire is adopted during welding, the strength and the toughness of the welding line are poor, and the fracture and the crack of the welding line are easy to occur.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to overcome the defect that a round copper stranded wire and a copper plate or a copper bar are difficult to be directly welded, and provides a method for welding the end of the round copper stranded wire for the transformer of the electric locomotive, which can ensure that the round copper stranded wire and the copper plate and the copper bar are convenient to weld, the joint strength after welding is higher, and the yield is high.
The technical scheme of the invention is as follows: an end welding treatment method of a round copper stranded wire for an electric locomotive transformer comprises the following steps:
(1) screening copper pipes: selecting a copper pipe with a proper diameter and wall thickness according to the area of the round copper stranded wire;
(2) annealing the copper pipe: cutting the copper pipe screened in the step (1) into one section or two sections according to the welding size, and then annealing the copper pipe according to a certain heat treatment process;
(3) pre-arranging sheet solder: wrapping the end of the round copper stranded wire with a sheet solder, and then sleeving the annealed copper pipe in the step (2) on the end of the round copper stranded wire;
(4) and (3) crimping: flattening and fixing the end head assembled in the step (3) in a crimping device and a die to enable the end head of the round copper stranded wire to form a plane with a certain size;
(5) welding: heating and welding the end processed in the step (4) by using brazing equipment, wherein welding wires are required to fill welding seams in the process;
(6) machining: and (4) machining the end welded in the step (5) according to the product requirement.
Further, when the copper pipe is annealed in the step (2), a stress relief annealing mode is adopted, and the specific process is as follows: firstly, carrying out acid washing, rinsing with clear water and drying treatment on the surface of a copper pipe, wherein an acid washing reagent is a hydrochloric acid solution with the concentration of 25-30%; secondly, placing the treated copper pipe in a heating device, introducing nitrogen with the purity of 99.99 percent into the heating device, annealing the copper pipe at the heating rate of 9-11 ℃/min until the temperature is increased to 650 plus 750 ℃, and preserving the heat for 5-8 h; and finally, cooling along with the furnace to obtain the annealed copper pipe, cleaning the surface of the copper pipe to remove oxides, metal chips, dust and other impurities on the surface of the copper pipe, and avoiding surface impurities from entering the annealing furnace, thereby influencing the surface cleanliness of the copper pipe and reducing the strength of a joint after subsequent welding.
Further, the welding wire used in the step (5) is a cracking-resistant composite layer welding wire, and the specific structure of the welding wire is as follows: the welding wire comprises an innermost metal welding core, a porous framework layer coated outside the metal welding core, a connecting layer filled in the porous framework layer and a toughening layer coated outside the connecting layer, wherein the porous framework layer is made of micro-carbon ferrochrome, the connecting layer is made of bismuth, lead, indium and tin, the toughening layer is made of nickel powder and manganese powder, the overall strength and the wear resistance of the welding wire can be improved by arranging the porous framework layer made of the micro-carbon ferrochrome, and when welding is needed, the micro-carbon ferrochrome can also generate Cr with higher strength and hardness with C7C3The strength and the wear resistance of the welding wire can be further improved by the aid of metal compounds, secondary welding is avoided after fracture of a welding position occurs, alloy consisting of bismuth, lead, indium and tin permeates into the porous framework layer, the alloy can be used for connecting mutually welded workpieces after being melted during welding, the welding firmness is improved, the nickel and the manganese are coated on the outermost layer, the solid solution strengthening effect is strong, the strength and the toughness of the welding alloy can be improved, and the cracking phenomenon is avoided.
Further, the manufacturing process of the anti-cracking composite layer welding wire comprises the following steps:
s1: firstly, polishing the surface of a metal core wire, cleaning for 8-10min in an ultrasonic cleaning mode, immersing the treated metal core wire into 0.1mol/L nitric acid solution for etching at room temperature, then cleaning and drying in absolute ethyl alcohol solution to obtain a pretreated metal core wire, and etching the surface of the metal core wire by the nitric acid solution to roughen the surface of the metal core wire, so that the surface area of the metal core wire, the contact area of a porous framework layer and the metal core wire and the binding force of the porous framework layer and the metal core wire are increased, the strength of the welding wire is improved, and the welding wire is prevented from being broken to influence the welding effect;
s2: secondly, putting micro-carbon ferrochrome into a medium-frequency induction furnace, melting, putting the micro-carbon ferrochrome melt into a spray drying tower for spray drying at the temperature of 190 plus of 200 ℃, then putting the metal core with the surface coated with the micro-carbon ferrochrome on a rotating device, rotating at the rotating speed of 35-40r/min in a vacuum environment, introducing argon into the metal core until the vacuum degree is 15-20Pa, ionizing the argon into argon ions, and carrying out plasma sputter etching on the surface of the metal core by using the argon ions to obtain a porous matrix I;
s3: then, mixing bismuth, lead, indium and tin metal powder, fixing the first porous substrate on a workbench, spraying the mixed metal powder onto the surface or in holes of the first porous substrate by using a physical vapor deposition method to form a second substrate, and spraying the mixed bismuth, lead, indium and tin metal powder into a porous structure, so that the content of bismuth, lead, indium and tin metal in a connecting layer is increased, and the welding firmness is improved;
s4: and finally, mixing the nickel powder and the manganese powder, blowing the mixed powder to the two surfaces of the matrix for laser melting deposition treatment, and forming the toughening layer.
Further, in the step S4, when the laser melting deposition treatment is adopted, the laser power is 750-.
Further, the round copper stranded wire end obtained after the treatment of the step (4) is subjected to embossing treatment, the roughness of the round copper stranded wire end plane after the embossing treatment is greatly increased, the number of welding points is increased, and the welding firmness is improved.
Further, in the step (5), when the round copper stranded wire end subjected to the welding treatment is subjected to a tensile test, the damage mode of the round copper stranded wire end is as follows: the round copper stranded wire is broken in a heat affected zone, the whole stranded wire is not required to be pulled out of the copper pipe, the strength of the metal material inside the round copper stranded wire is lower than that of weld metal, and the round copper stranded wire is easy to break if the whole stranded wire is pulled out of the copper pipe.
Furthermore, before welding the end processed in the step (4), the end is placed into a baking furnace, heating is carried out under the condition that the temperature is 300-350 ℃., the preheating is finished after heat preservation is carried out for 3-5h, after the welding of the end is finished, the temperature is controlled to be 150-200 ℃ for heating in the baking furnace, and the heat preservation is carried out for 2-3h, so that the high-temperature heat regeneration treatment is finished, wherein the internal pressure in the baking furnace is 100-105KPa, the preheating is carried out before the welding of the end, and the heat regeneration is carried out after the welding is finished, so that the cooling speed of a welding line is reduced, and the generation of cold cracks after the welding is avoided.
The invention has the beneficial effects that: the invention provides a method for welding the end of a round copper stranded wire for an electric locomotive transformer, which has the following advantages:
1. according to the invention, the round copper stranded wire end is sleeved with the copper pipe, and after compression joint and welding, the round copper stranded wire end obtains a plane with a certain size, on one hand, the obtained plane can be utilized to conveniently lap joint and braze with the copper plate or the copper rod, so that the overall yield and production efficiency can be improved; on the other hand, the copper pipe and the round copper stranded wire treated by the method have high binding force, high joint strength and more guaranteed safety and reliability.
2. According to the invention, before the round copper stranded wire end is covered with the copper pipe, the surface of the copper pipe is cleaned and annealed, on one hand, oxides, metal chips, dust and other impurities on the surface of the copper pipe are removed, and surface impurities are prevented from entering an annealing furnace, so that the surface cleanliness of the copper pipe is influenced, and the strength of a joint after subsequent welding is reduced; on the other hand, the hardness of the copper pipe is reduced, and the plasticity is improved, so that the subsequent compression joint processing is facilitated.
3. The invention uses the anti-cracking composite layer welding wire with high strength and anti-cracking performance to weld, the overall strength and the wear resistance of the welding wire can be improved by arranging the porous framework layer made of the micro-carbon ferrochrome material, and when welding is needed, the micro-carbon ferrochrome can also generate Cr with higher strength and hardness with C7C3The metal compounds can further increase the strength and the wear resistance of the welding wire, avoid secondary welding after the fracture of the welding position, and lead the welding wire to be multi-directionalThe alloy composed of bismuth, lead, indium and tin is permeated into the hole skeleton layer, when in welding, the alloy can be used for connecting mutually welded workpieces after being melted, the firm performance of welding is improved, the outermost layer is coated with nickel and manganese which have strong solid solution strengthening effect, the strength and toughness of the welding alloy can be improved, and the cracking phenomenon is avoided.
4. The invention preheats the round copper stranded wire end before welding and regenerates heat after welding is finished, and aims to reduce the cooling speed of a welding line, avoid cold cracks after welding and increase the welding effect.
Drawings
FIG. 1 is a schematic view of a round copper stranded wire with two ends welded according to the present invention;
FIG. 2 is a cross-sectional view of a round copper strand with two ends welded according to the present invention;
FIG. 3 is a schematic structural view of the crack-resistant composite layer welding wire of the present invention.
The welding material comprises 1-copper pipe, 2-round copper stranded wire, 3-welding flux, 4-metal welding core, 5-porous framework layer, 6-connecting layer and 7-toughening layer.
Detailed Description
The technical solution of the present invention is further described in detail with reference to the following examples, but the scope of the present invention is not limited thereto.
Example 1
An end welding treatment method of a round copper stranded wire for an electric locomotive transformer comprises the following steps:
(1) screening copper pipes: selecting a round copper stranded wire with the area of 95mm2Selecting a copper pipe with the diameter of 18mm and the wall thickness of 2 mm;
(2) annealing the copper pipe: averagely cutting the copper pipe screened in the step (1) into two sections according to the welding size, and then annealing the copper pipe according to a certain heat treatment process;
(3) pre-arranging sheet solder: wrapping the end of the round copper stranded wire with a sheet solder, and then sleeving the annealed copper pipe in the step (2) on the end of the round copper stranded wire;
(4) and (3) crimping: flattening and fixing the end head assembled in the step (3) in a crimping device and a die to enable the end head of the round copper stranded wire to form a plane with a certain size, as shown in figures 1 and 2;
(5) welding: heating and welding the end processed in the step (4) by using brazing equipment, wherein welding wires are required to fill welding seams in the process;
(6) machining: and (5) performing end face milling on the welded end head in the step (5).
Wherein, in step (5), for the round copper stranded wire end subjected to welding treatment, when a tensile test is performed, the damage mode of the round copper stranded wire end is as follows: the round copper stranded wire is broken in a heat affected zone, the whole stranded wire is not required to be pulled out of the copper pipe, the strength of the metal material inside the round copper stranded wire is lower than that of weld metal, and the round copper stranded wire is easy to break if the whole stranded wire is pulled out of the copper pipe.
Example 2
This example is substantially the same as example 1 except that:
when the copper pipe is annealed in the step (2), a stress relief annealing mode is adopted, and the specific process is as follows: firstly, carrying out acid washing, rinsing with clear water and drying treatment on the surface of a copper pipe, wherein an acid washing reagent is a hydrochloric acid solution with the concentration of 28%; secondly, placing the copper pipe subjected to the treatment in a heating device, introducing nitrogen with the purity of 99.99%, annealing the copper pipe at the heating rate of 10 ℃/min until the temperature rises to 700 ℃, and preserving the heat for 7 hours; and finally, cooling along with the furnace to obtain the annealed copper pipe, cleaning the surface of the copper pipe to remove oxides, metal chips, dust and other impurities on the surface of the copper pipe, and avoiding surface impurities from entering the annealing furnace, thereby influencing the surface cleanliness of the copper pipe and reducing the strength of a joint after subsequent welding.
Example 3
This embodiment is substantially the same as embodiment 2 except that:
the welding wire used in the step (5) is a cracking-resistant composite layer welding wire, and the specific structure is as follows: a metal core wire 4 positioned at the innermost layer and coated on the metal core wire4 external porous frame layer 5, connecting layer 6 filled in the porous frame layer 5, toughening layer 7 coated outside the connecting layer 6, wherein the metal welding core 4 is made of silver, the porous frame layer 5 is made of micro-carbon ferrochrome, the connecting layer 6 is made of bismuth, lead, indium and tin, the toughening layer 7 is made of nickel powder and manganese powder, the overall strength and wear resistance of the welding wire can be improved by arranging the porous frame layer 5 made of micro-carbon ferrochrome, and when welding is needed, the micro-carbon ferrochrome can also generate Cr with higher strength and hardness with C7C3The strength and the wear resistance of the welding wire can be further improved by the metal compounds, secondary welding is avoided after the welding position is broken, the alloy consisting of bismuth, lead, indium and tin is infiltrated into the porous framework layer 5, when welding is carried out, the alloy can be used for connecting mutually welded workpieces after being melted, the welding firmness is improved, the nickel and manganese are coated on the outermost layer, the solid solution strengthening effect is strong, the strength and the toughness of the welding alloy can be improved, and the cracking phenomenon is avoided;
the manufacturing process of the anti-cracking composite layer welding wire comprises the following steps:
s1: firstly, polishing the surface of a metal core wire 4, cleaning for 9min in an ultrasonic cleaning mode, immersing the treated metal core wire 4 into 0.1mol/L nitric acid solution for etching at room temperature, then cleaning and drying in absolute ethyl alcohol solution to obtain a pretreated metal core wire 4, and etching the surface of the metal core wire 4 by the nitric acid solution to roughen the surface of the metal core wire 4, so that the surface area of the metal core wire 4, the contact area and the bonding force of a porous framework layer 5 and the metal core wire 4 are increased, the strength of a welding wire is improved, and the welding wire fracture phenomenon is avoided from occurring to influence the welding effect;
s2: secondly, putting micro-carbon ferrochrome into a medium-frequency induction furnace, melting, putting the micro-carbon ferrochrome melt into a spray drying tower for spray drying at the temperature of 200 ℃, then putting the metal core 4 with the surface coated with the micro-carbon ferrochrome on a rotating device, rotating at the rotating speed of 38r/min in a vacuum environment, introducing argon into the metal core until the vacuum degree is 18Pa, ionizing the argon into argon ions, and carrying out plasma sputtering etching on the surface of the metal core 4 by utilizing the argon ions to obtain a porous matrix I;
s3: then, mixing bismuth, lead, indium and tin metal powder, fixing the first porous substrate on a workbench, spraying the mixed metal powder onto the surface or in holes of the first porous substrate by using a physical vapor deposition method to form a second substrate, and spraying the mixed metal powder into a porous structure, so that the content of bismuth, lead, indium and tin in the connecting layer 6 is increased, and the welding firmness is improved;
s4: and finally, mixing nickel powder and manganese powder, blowing the mixed powder to the two surfaces of the matrix for laser melting deposition treatment to form a toughening layer 7, wherein the laser power is 750-850W, the laser beam scanning speed is 8-15mm/s, the powder feeding speed is 15-25g/min, and the laser beam vertically scans and coaxially blows argon.
Example 4
This example is substantially the same as example 3, except that:
and (4) embossing the end of the round copper stranded wire obtained after the treatment in the step (4), greatly increasing the roughness of the end plane of the round copper stranded wire subjected to embossing treatment, increasing the number of welding points and improving the welding firmness.
Example 5
This example is substantially the same as example 4, except that:
and (4) before welding the machined end head, putting the machined end head into a baking furnace, heating at the temperature of 330 ℃, preserving heat for 4 hours to finish preheating, after welding the end head, heating at the temperature of 180 ℃ in the baking furnace, and preserving heat for 2.5 hours to finish high-temperature heat regeneration treatment, wherein the internal pressure in the baking furnace is 100KPa, preheating before welding the end head and regenerating heat after welding, and the purpose is to reduce the cooling speed of a welding line and avoid cold cracks after welding.
Test examples
The relevant performance parameters of the weld joint at the end of the round copper stranded wire welded according to the welding method of the embodiment 1-5 of the invention are shown in table 1:
table 1: relevant Performance parameters of the weld at the end of the round copper stranded wire welded by the methods of examples 1-5
Therefore, as can be seen from comparing examples 1 to 5 in table 1, after the welding method of example 1 is used to weld the end of the round copper stranded wire, the performance of the welding seam is not as good as that of the welding method of examples 2 to 5, wherein the performance of example 5 is the best, because example 5 is the technical scheme combining the first four examples, and meanwhile, preheating is performed before the end is welded and heat regeneration is performed after the end is welded, the cooling rate of the welding seam is reduced, and the generation of cold cracks after the end is welded is avoided, therefore, after the welding method of example 5 is used to weld the end of the round copper stranded wire, the strength and toughness of the welding seam are high, the welding seam is not easy to crack, the bonding force between the end copper sleeve and the round copper stranded wire is high, the joint strength is good, and the welding seam is safe and reliable.
Claims (4)
1. An end welding treatment method of a round copper stranded wire for an electric locomotive transformer is characterized by comprising the following steps:
(1) screening copper pipes: selecting a copper pipe with a proper diameter and wall thickness according to the area of the round copper stranded wire;
(2) annealing the copper pipe: cutting the copper pipe screened in the step (1) into one section or two sections according to the welding size, and then annealing the copper pipe according to a certain heat treatment process;
(3) pre-arranging sheet solder: wrapping the end of the round copper stranded wire with a sheet solder, and then sleeving the annealed copper pipe in the step (2) on the end of the round copper stranded wire;
(4) and (3) crimping: flattening and fixing the end head assembled in the step (3) in a crimping device and a die to enable the end head of the round copper stranded wire to form a plane with a certain size;
(5) welding: heating and welding the end processed in the step (4) by using brazing equipment, wherein welding wires are required to fill welding seams in the process;
(6) machining: machining the end head welded in the step (5) according to the requirement of a product;
when the copper pipe is annealed in the step (2), a stress relief annealing mode is adopted, and the specific process is as follows: firstly, carrying out acid washing, rinsing with clear water and drying treatment on the surface of a copper pipe, wherein an acid washing reagent is a hydrochloric acid solution with the concentration of 25-30%; secondly, placing the treated copper pipe in a heating device, introducing nitrogen with the purity of 99.99 percent into the heating device, annealing the copper pipe at the heating rate of 9-11 ℃/min until the temperature is increased to 650 plus 750 ℃, and preserving the heat for 5-8 h; finally, cooling along with the furnace to obtain an annealed copper pipe;
the welding wire used in the step (5) is a cracking-resistant composite layer welding wire, and the specific structure is as follows: the welding wire comprises a metal welding core (4) positioned on the innermost layer, a porous framework layer (5) coated outside the metal welding core (4), a connecting layer (6) filled in the porous framework layer (5), and a toughening layer (7) coated outside the connecting layer (6), wherein the porous framework layer (5) is made of micro-carbon ferrochrome, the connecting layer (6) is made of bismuth, lead, indium and tin, and the toughening layer (7) is made of nickel powder and manganese powder;
the manufacturing process of the anti-cracking composite layer welding wire comprises the following steps:
s1: firstly, polishing the surface of a metal welding core (4), cleaning for 8-10min in an ultrasonic cleaning mode, immersing the treated metal welding core (4) into a 0.1mol/L nitric acid solution for etching at room temperature, and then cleaning and drying in an absolute ethyl alcohol solution to obtain the pretreated metal welding core (4);
s2: secondly, putting micro-carbon ferrochrome into a medium-frequency induction furnace, melting, putting the micro-carbon ferrochrome melt into a spray drying tower for spray drying at the temperature of 190 plus of 200 ℃, then putting the metal core (4) with the surface coated with the micro-carbon ferrochrome on a rotating device, rotating at the rotating speed of 35-40r/min under the vacuum environment, introducing argon until the vacuum degree is 15-20Pa, ionizing the argon into argon ions, and carrying out plasma sputter etching on the surface of the metal core (4) by utilizing the argon ions to obtain a porous first matrix;
s3: then mixing bismuth, lead, indium and tin metal powder, fixing the porous substrate I on a workbench, and spraying the mixed metal powder onto the surface or in the holes of the porous substrate I by using a physical vapor deposition method to form a substrate II;
s4: and finally, mixing the nickel powder and the manganese powder, blowing the mixed powder to the two surfaces of the matrix for laser melting deposition treatment, and forming the toughening layer (7).
2. The method as claimed in claim 1, wherein in step S4, when the laser melting deposition process is used, the laser power is 750-.
3. The method for welding the ends of the round copper strands for the transformer of the electric locomotive according to claim 1, wherein the ends of the round copper strands obtained after the step (4) are subjected to embossing treatment.
4. The method for welding the end of the round copper stranded wire for the electric locomotive transformer according to claim 1, wherein the welded round copper stranded wire end in the step (5) is damaged in a tensile test in a manner that: the round copper stranded wire is broken in a heat affected zone.
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| EP2160806B1 (en) * | 2007-06-06 | 2013-02-20 | Schunk Sonosystems Gmbh | Method for connectingstranded wires in an electrically conducting manner and ultrasound welding device |
| KR101082892B1 (en) * | 2010-07-28 | 2011-11-17 | 주식회사 창환단자공업 | Connecting method of battery cable and terminal |
| DE102013212331A1 (en) * | 2013-04-04 | 2014-10-09 | Telsonic Holding Ag | Method of connecting a tubular cable lug to a strand made of aluminum |
| CN105490125A (en) * | 2015-12-22 | 2016-04-13 | 安徽皖新电机有限公司 | Wire connection method and special connection terminal |
| CN109742640B (en) * | 2019-01-02 | 2020-10-09 | 武汉船用机械有限责任公司 | Method for connecting cable and wiring terminal |
| CN210132175U (en) * | 2019-05-23 | 2020-03-10 | 北京诺飞新能源科技有限责任公司 | High-strength anti-cracking aluminum alloy welding wire for welding joint |
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