CN106825834B - A kind of welder and its method for superconducting joint inside NbTi/Cu superconducting coils - Google Patents
A kind of welder and its method for superconducting joint inside NbTi/Cu superconducting coils Download PDFInfo
- Publication number
- CN106825834B CN106825834B CN201710170921.6A CN201710170921A CN106825834B CN 106825834 B CN106825834 B CN 106825834B CN 201710170921 A CN201710170921 A CN 201710170921A CN 106825834 B CN106825834 B CN 106825834B
- Authority
- CN
- China
- Prior art keywords
- welding
- main platen
- temperature
- superconducting
- joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/04—Heating appliances
- B23K3/047—Heating appliances electric
- B23K3/0478—Heating appliances electric comprising means for controlling or selecting the temperature or power
-
- 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
-
- 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
- B23K1/206—Cleaning
-
- 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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
- H01R43/0242—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections comprising means for controlling the temperature, e.g. making use of the curie point
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
Abstract
The invention discloses a kind of welder and its method for superconducting joint inside NbTi/Cu superconducting coils, the device includes temperature control unit, welding main platen, weld size compressing unit and insulating unit；The temperature control unit includes heating rod, temperature sensor and temperature controller, and power supply is connected by temperature controller with heating rod, temperature sensor；The heating rod is arranged on the main platen of welding；The temperature sensor is laid in the solder side adjacent for welding main platen；The main platen of welding is in " convex " shape, and superconducting line joint is pressed on the main platen of welding by weld size compressing unit；The weld size compressing unit is made up of two sets of compression bars；Two sets of compression bars are fixed by screw with the upper end and sidepiece for welding main platen；Superconducting line joint is placed on compression bar and welded at main platen angle.The present invention is welded by adjustable welding device to coil inside joint, it can be ensured that joint dimension meets the requirements.
Description
Technical field
The invention belongs to superconductor applications technical field, is related to one kind and is available in NbTi/Cu superconducting magnet coil winding process
The welder and its method of superconducting joint, particularly suitable welding space has between limitation, superconducting line or superconducting line and routine
There is the welding of strict demand between conductor to size.
Background technology
In superconducting magnet coil winding process, due to the impossible endless of superconduction line length, or because of Practical Project demand
Carry out customized paragraph by paragraph, these require solve length issue by way of connection, therefore, the interconnection technique of superconducting wire into
For a key technology in practical application.At present, the welding of superconducting joint is generally welded using soldering, but general commercial
Electric iron heating-up temperature is uneven and unmanageable, and joint dimension is also difficult to hold, and the joint cooling after welding can only also use certainly
So cooling, such weld quality depend on the qualification of operator, and the size and resistance of joint can not obtain well
Ensure, it is final to superconducting coil coiling and coil safe for operation to bring serious challenge.Therefore, controlled in welding process
Temperature homogeneity processed, it is ensured that joint dimension and connection resistance meet to require, are that superconductor applications terminate to be badly in need of the key technology solved.
The content of the invention
The shortcomings that it is an object of the invention to overcome prior art, there is provided one kind be available for NbTi/Cu superconducting magnet coils around
The welder and its method of superconducting joint, pass through the control of welder during system, it can be ensured that welding point accurate size,
Connection resistance is low, is easy to execute-in-place, effectively reduces manual operation factor, improves superconducting joint quality.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of welder for superconducting joint inside NbTi/Cu superconducting coils, including temperature control unit, welding master
Platen, weld size compressing unit and insulating unit；
The temperature control unit includes heating rod, temperature sensor and temperature controller, and power supply passes through temperature controller
It is connected with heating rod, temperature sensor；The heating rod is arranged on the main platen of welding；The temperature sensor is laid in welding
The solder side adjacent of main platen；
The main platen of welding is in " convex " shape, and superconducting line joint is pressed on welding by weld size compressing unit
On main platen；
The weld size compressing unit is made up of two sets of compression bars；Two sets of compression bars pass through screw and welding
The upper end of main platen and sidepiece are fixed；Superconducting line joint is placed on compression bar and welded at main platen angle.
The heating rod is being heated to welding main platen；The temperature sensor collecting temperature feeds back to temperature control
In instrument processed.
The respectively upper compression bar of two sets of compression bars and side compression bar, the L-shaped shape of above-mentioned compression bar.
The main platen of the welding and compression bar material therefor are 6061 aluminium.
Baltimore groove is left in the face parallel with compression bar on the upper end of the main platen of welding and sidepiece.
The main platen lower face of the welding is connected with insulating unit, and the insulating unit material is G10, its by epoxy glue and
Weld main platen and carry out stickup fixation；Water circulation unit is disposed with inside the main platen of welding, the water circulation unit is by two
Inlet and outlet pipe forms.
A kind of welding method for superconducting joint inside NbTi/Cu superconducting coils, this method welding sequence are as follows：
1) conductive line surfaces cleaning treatment：Need solder side insulated paint and blister copper layer to polish off in wire using sand paper, then make
It is clean with gauze, alcohol wipe；
2) solder is handled：Sn63-Pb37 strip solders are cut；
3) positioning is with fixing：The superconducting line that need to be welded, the solder cut are put according to superconducting line-solder-superconducting line
The edge of main platen is being welded, is ensureing to weld superconducting line and solder surface at main platen angle and on the same face, reuses pressure
Tight bar compresses, with compression bar by edge jam-packed；
4) temperature control heats：Temperature in use control unit controls heating rod, slowly heats up and by temperature control higher than solder
20 DEG C of temperature；
5) extrude：Fastening screw, two compression bars are compressed, after excess solder is extruded at gap, stop heating；
6) cool down：Waiting temperature stops after rising, and opens water circulation unit, starts to cool, waiting temperature is reduced to normal temperature；
7) trimming and cleaning：The superconducting joint being welded is taken out, edge is handled, cuts redundance, is used
Alcohol wipes surface contaminants.
Beneficial effects of the present invention：The present invention is welded by adjustable welding device to coil inside joint, can
Ensure that joint dimension meets the requirements, connection resistance value is dropped in the range of liquid helium region allows, has water to follow in welder
Ring element, it is easy to the cooling problem for the welding point that coil inside limited space brings, the stabilization of magnet coil can be improved
Property and security.
Brief description of the drawings
For the ease of it will be appreciated by those skilled in the art that the present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is the welder structural representation of superconducting joint of the present invention；
Fig. 2 is temperature control unit connection diagram of the present invention；
Fig. 3 is water circulation unit structural representation of the present invention.
Embodiment
Technical scheme is clearly and completely described below in conjunction with embodiment, it is clear that described reality
It is only part of the embodiment of the present invention to apply example, rather than whole embodiments.It is general based on the embodiment in the present invention, this area
All other embodiment that logical technical staff is obtained under the premise of creative work is not made, belong to what the present invention protected
Scope.
A kind of welder for superconducting joint inside NbTi/Cu superconducting coils, as shown in figure 1, including temperature control
Unit, welding main platen 2, weld size compressing unit and insulating unit 1；
As shown in Fig. 2 temperature control unit, which includes heating rod 3, temperature sensor 6 and temperature controller, power supply, passes through temperature
Degree controller is connected with heating rod 3, temperature sensor 6；Heating rod 3 to the main platen 2 of welding to be heated, temperature sensor
6 collecting temperatures are fed back in temperature controller, and the temperature that temperature sensor 6 gathers is contrasted with the temperature set, determine to add
The heating state of hot pin 3；Above-mentioned design temperature is the melting temperature of solder；
Referring to Fig. 1, heating rod 3 is arranged on the main platen 2 of welding, welds and installation heating rod 3 is provided with the main center of platen 2
Heating rod mounting hole, it can be ensured that temperature is uniform in heating process；Temperature sensor hole is laid in solder side adjacent, to install
Temperature sensor 6, it is ensured that temperature it is accurate；Heating rod 3, temperature sensor 6 and temperature controller collectively constitute temperature control list
Member, the temperature control for whole weld heating process；
It is in " convex " shape to weld main platen 2, and superconducting line joint is placed on the main edge of 2 top of platen one of welding, and
The superconducting line joint that need to be welded is compressed by weld size compressing unit, and regulation is controlled to weld size；
Weld size compressing unit is made up of two sets of compression bars 4, respectively upper compression bar and side compression bar, above-mentioned compression
The L-shaped shape of bar, its size determine according to superconduction linear dimension and weld size；Two sets of compression bars 4 pass through screw 7 and welding
The upper end of main platen 2 and sidepiece are fixed；Superconducting line joint is placed on compression bar 4 and welded at main 2 jiaos of platen, in order to ensure to compress
Effect, wherein the compression end of a compression bar offers cooperation otch；Main platen 2 and compression bar 4 material therefor is welded as 6061
Aluminium, this material and soldering solder are non-sticky, superconducting joint can be easy to be taken out from frock；
Weld face parallel with compression bar 4 on the main side of platen 2 and leave Baltimore groove 5, be easy to compression bar 4 with welding main platen
The depth of parallelism control of 2 sides；
Weld the main lower face of platen 2 to be connected with insulating unit 1, prevent that bottom surface temperature is too high in heating process, to operator
Member damages, and the insulating unit material is G10, and it carries out stickup fixation by epoxy glue with welding main platen；Weld main
Water circulation unit 8 is disposed with inside plate 2, the cooling of rear joint is completed for welding；The water circulation unit is by two inlet tube and outlet tubes
Road forms, as shown in figure 3, will weld main platen temperature by the flowing of water reduces, water circulation system solves Temperature fall
Slow unfavorable factor is crossed, also is adapted for the limitations demand at coil winding scene.
Above-mentioned global design can avoid in welding process because of artificial origin and caused by weld quality it is uneven.
In magnet winding process, coil inside needs to use superconducting joint to be attached, and extends magnet coil length；This
Invention provides a kind of welding method of superconducting joint in NbTi/Cu superconducting magnet coils winding process, and this method welding sequence is such as
Under：
1) conductive line surfaces cleaning treatment：Need solder side insulated paint and blister copper layer to polish off in wire using sand paper, then make
It is clean with gauze, alcohol wipe；
2) solder is handled：Sn63-Pb37 strip solders are cut and (are dimensioned slightly smaller than superconduction wire bonding)；
3) positioning is with fixing：By the superconducting line that need to be welded, the solder cut according to sandwich formats (superconducting line-weldering
Material-superconducting line) edge for welding main platen is placed on, ensure to weld at main platen angle, superconducting line and solder surface are in the same face
On, compression bar compression is reused, surveys compression bar by edge jam-packed；
4) temperature control heats：Temperature in use control unit controls heating rod, slowly heats up and by temperature control higher than solder
20 DEG C of temperature；
5) extrude：Fastening screw, two compression bars are compressed, after excess solder is extruded at gap, stop heating；
6) cool down：Waiting temperature stops after rising, and opens water circulation unit, starts to cool, waiting temperature is reduced to normal temperature；
7) trimming and cleaning：The superconducting joint being welded is taken out, edge is handled, cuts redundance, is used
Alcohol wipes surface contaminants；So far, the welding of superconducting magnet coil internal connection is completed, other joints are completed using above-mentioned steps
Welding.
The present invention, which is placed on NbTi/Cu superconducting lines in the device specially designed, to be welded, and device is easily operated, is solved
Limitation of the coiling site space limitation to ordinary couplings welding method.Contain water circulation unit in device, solve nature
Cool the influence problem of slow butt joint resistance.Compression bar can control superconducting joint size, it is ensured that coiling size meets
It is required that.The welding of this welder and method to superconducting joint in NbTi/Cu superconducting line winding process is used,
As a result show that resistance is satisfied by requiring under joint mechanical strength, joint dimension and low temperature.
Present invention disclosed above preferred embodiment is only intended to help and illustrates the present invention.Preferred embodiment is not detailed
All details are described, it is only described embodiment also not limit the invention.Obviously, according to the content of this specification,
It can make many modifications and variations.This specification is chosen and specifically describes these embodiments, is to preferably explain the present invention
Principle and practical application so that skilled artisan can be best understood by and utilize the present invention.The present invention is only
Limited by claims and its four corner and equivalent.
Claims (7)
1. a kind of welder for superconducting joint inside NbTi/Cu superconducting coils, it is characterised in that including temperature control list
Member, welding main platen (2), weld size compressing unit and insulating unit (1)；
The temperature control unit includes heating rod (3), temperature sensor (6) and temperature controller, power supply and passes through temperature control
Instrument is connected with heating rod (3), temperature sensor (6)；The heating rod (3) is arranged on the main platen (2) of welding；The temperature passes
Sensor (6) is laid in the solder side adjacent for welding main platen (2)；
The main platen (2) of welding is in " convex " shape, and superconducting line joint is pressed on welding by weld size compressing unit
On main platen (2)；
The weld size compressing unit is made up of two sets of compression bars (4)；Two sets of compression bars (4) pass through screw (7)
Fixed with the upper end and sidepiece for welding main platen (2)；Superconducting line joint is placed at compression bar (4) and main platen (2) angle of welding.
2. welder according to claim 1, it is characterised in that the heating rod (3) is giving welding main platen (2)
Heated；Temperature sensor (6) collecting temperature is fed back in temperature controller.
3. welder according to claim 1, it is characterised in that two sets of compression bars (4) are respectively upper compression bar
With side compression bar, the L-shaped shape of above-mentioned compression bar.
4. welder according to claim 1, it is characterised in that described to weld used in main platen (2) and compression bar (4)
Material is 6061 aluminium.
5. welder according to claim 1, it is characterised in that the upper end of the main platen (2) of welding and sidepiece
Leave Baltimore groove (5) in the upper face parallel with compression bar (4).
6. welder according to claim 1, it is characterised in that main platen (2) lower face of welding and heat-insulated list
First (1) connection, the insulating unit material is G10, and it carries out stickup fixation by epoxy glue with welding main platen；The welding master
Water circulation unit (8) is disposed with inside platen (2), the water circulation unit is made up of two inlet and outlet pipes.
7. a kind of usage right requires that the welder described in any one of 1-6 carries out superconducting joint inside NbTi/Cu superconducting coils
The method of welding, it is characterised in that this method welding sequence is as follows：
1) conductive line surfaces cleaning treatment：Need solder side insulated paint and blister copper layer to polish off in wire using sand paper, reuse yarn
Cloth, alcohol wipe are clean；
2) solder is handled：Sn63-Pb37 strip solders are cut；
3) positioning is with fixing：The superconducting line that need to be welded, the solder cut are placed on weldering according to superconducting line-solder-superconducting line
The edge of main platen is connect, ensures to weld superconducting line and solder surface at main platen angle and on the same face, reuses compression bar
Compress, with compression bar by edge jam-packed；
4) temperature control heats：Temperature in use control unit controls heating rod, slowly heating and by temperature control higher than 20 DEG C of solder
Temperature；
5) extrude：Fastening screw, two compression bars are compressed, after excess solder is extruded at gap, stop heating；
6) cool down：Waiting temperature stops after rising, and opens water circulation unit, starts to cool, waiting temperature is reduced to normal temperature；
7) trimming and cleaning：The superconducting joint being welded is taken out, edge is handled, cuts redundance, uses alcohol
Wipe surface contaminants.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710170921.6A CN106825834B (en) | 2017-03-21 | 2017-03-21 | A kind of welder and its method for superconducting joint inside NbTi/Cu superconducting coils |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710170921.6A CN106825834B (en) | 2017-03-21 | 2017-03-21 | A kind of welder and its method for superconducting joint inside NbTi/Cu superconducting coils |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106825834A CN106825834A (en) | 2017-06-13 |
| CN106825834B true CN106825834B (en) | 2018-03-30 |
Family
ID=59130772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710170921.6A Active CN106825834B (en) | 2017-03-21 | 2017-03-21 | A kind of welder and its method for superconducting joint inside NbTi/Cu superconducting coils |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106825834B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110600896B (en) * | 2019-09-27 | 2024-08-16 | 中国科学院理化技术研究所 | Multi-strand superconducting metal wire joint structure |
| CN117316619B (en) * | 2023-10-23 | 2024-09-20 | 中国科学院电工研究所 | Welding and winding integrated high-temperature superconducting coil winding device and joint welding method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723160A (en) * | 2012-05-31 | 2012-10-10 | 西部超导材料科技有限公司 | Superconducting magnet joint and manufacturing method thereof |
| CN102779605A (en) * | 2011-05-12 | 2012-11-14 | 上海联影医疗科技有限公司 | Superconducting joint for superconducting magnet of magnetic resonance imaging system |
| CN103325517A (en) * | 2013-05-20 | 2013-09-25 | 西部超导材料科技股份有限公司 | Manufacturing method for NbTi/Cu superconducting joint |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0966360A (en) * | 1995-08-30 | 1997-03-11 | Nippon Avionics Co Ltd | Structure of heater tool |
| JP2001185841A (en) * | 1999-12-27 | 2001-07-06 | Suzuka Fuji Xerox Co Ltd | Heating and melting device for attaching electronic component |
| CN101409129B (en) * | 2008-07-17 | 2011-12-28 | 中国科学院等离子体物理研究所 | Super-conduction stacking brazing method and mold for high-temperature supercurrent down-lead |
| CN102941387B (en) * | 2012-12-07 | 2015-07-22 | 中国船舶重工集团公司第七一二研究所 | Welding device and method for superconducting lines |
| CN103170699A (en) * | 2013-03-07 | 2013-06-26 | 中国科学院等离子体物理研究所 | Welding device and welding method for high temperature superconducting strip |
| CN104014893A (en) * | 2014-05-30 | 2014-09-03 | 中国船舶重工集团公司第七二五研究所 | Intelligent temperature control type welding device for high-temperature superconductive strip |
-
2017
- 2017-03-21 CN CN201710170921.6A patent/CN106825834B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102779605A (en) * | 2011-05-12 | 2012-11-14 | 上海联影医疗科技有限公司 | Superconducting joint for superconducting magnet of magnetic resonance imaging system |
| CN102723160A (en) * | 2012-05-31 | 2012-10-10 | 西部超导材料科技有限公司 | Superconducting magnet joint and manufacturing method thereof |
| CN103325517A (en) * | 2013-05-20 | 2013-09-25 | 西部超导材料科技股份有限公司 | Manufacturing method for NbTi/Cu superconducting joint |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106825834A (en) | 2017-06-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105880908B (en) | Control the device and method of the welding deformation of sheet member docking | |
| CN106825834B (en) | A kind of welder and its method for superconducting joint inside NbTi/Cu superconducting coils | |
| CN102941387B (en) | Welding device and method for superconducting lines | |
| CN205660330U (en) | Welding deformation's of control metal sheets butt joint device | |
| CN103170699A (en) | Welding device and welding method for high temperature superconducting strip | |
| CN102779605B (en) | Superconducting joint for superconducting magnet of magnetic resonance imaging system | |
| CN203853648U (en) | Fixture for brazing stellite plates on turbine blades | |
| CN205888316U (en) | Silver contact high -frequency induction brazing temperature feedback control system | |
| CN206912482U (en) | One kind is used for composite metal plastic pipe Suppression of High-frequency Welding Devices | |
| CN103706935B (en) | Method for manufacturing the starter armature through automatic starter armature wire feeding welding system | |
| CN103325517B (en) | The manufacture method of NbTi/Cu superconducting joint | |
| CN102665374A (en) | Method for assembling printed circuit board | |
| CN207615858U (en) | Frequency Induction Heating welding machine | |
| CN114724870B (en) | Welding device | |
| CN206326228U (en) | Double-casing motor main pole coil welding jigs and fixtures | |
| CN105633759A (en) | Low-resistance welding apparatus for thin-strip conductor | |
| CN208227371U (en) | Ferroalloy electric furnace short net system | |
| CN101262154B (en) | Welding technology for large and middle-scale synchronous generator stator bar connection wire | |
| CN209811454U (en) | Grounding body welding device | |
| CN206011760U (en) | A kind of PPR pipe pipe fitting welding equipment | |
| CN107552912A (en) | High-temperature superconductor band compresses soldering apparatus and welding method certainly with copper tip counterweight | |
| CN104157430B (en) | The lower yoke shielding construction of a kind of transformator and manufacturing process thereof | |
| CN207606461U (en) | A kind of oscillator wire bonding system | |
| CN205622017U (en) | Thin low resistance weld device of taking conductor | |
| CN106424997A (en) | Double-layer motor main pole coil welding method and clamp used in method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |