CN104923906B - A kind of ultrasonic brazing unit and its welding method for sheet metal - Google Patents
A kind of ultrasonic brazing unit and its welding method for sheet metal Download PDFInfo
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- CN104923906B CN104923906B CN201510384993.1A CN201510384993A CN104923906B CN 104923906 B CN104923906 B CN 104923906B CN 201510384993 A CN201510384993 A CN 201510384993A CN 104923906 B CN104923906 B CN 104923906B
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- plumb joint
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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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/14—Preventing or minimising gas access, or using protective gases or vacuum during 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/24—Preliminary treatment
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses a kind of ultrasonic brazing unit for sheet metal, including ultrasonic transducer, ultrasonic transformer and weld mold, welding base is provided with below weld mold, hydraulic stem is connected with above weld mold, the ultrasonic transformer includes separately positioned first end and the second end, and weld mold is fixed between first end and the second end, and first end is fixed on ultrasonic transducer, balance weight is fixed with the second end, is connected with balancing pole between first end and the second end；Weld mold includes pedestal, pedestal is fixed between first end and the second end, is fixed with plumb joint below pedestal, and the outside slip cap of plumb joint is connected to soldering sleeve, the inner homogeneous of plumb joint are provided with several the first cavitys, and the outside of welding base is provided with air nozzle.Present invention also offers a kind of method welded by use said apparatus.The present invention can improve the deficiencies in the prior art, improve the weldquality of ultrasonic bonding.
Description
Technical field
The present invention relates to metal welding techniques field, especially a kind of ultrasonic brazing unit for sheet metal.
Background technology
Ultrasonic bonding is the junction that high-frequency vibratory energy is delivered to workpiece to be welded, in the region, vibrational energy
The staggered infiltration fusion that amount makes the surface phase mutual friction of workpiece to be welded and formed between molecular layer, realizes quick, energy-conservation, nothing fire
Spend, be close to the welding of cool grinding；Oxidation change good is not being produced between making identical or different workpieces combine
The conductance of virgin metal on status basis, can be kept, can be widely applied to the weld job between various metals.Chinese invention
101905376 B of patent CN discloses a kind of ultrasonic brazing unit and a kind of ultrasonic welding method.But, prior art
In ultrasonic bonding not accurate enough for the vibration friction control of solder side, cause ultrasonic bonding compared with other tradition weldering
Method is connect, weldquality is poor.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of ultrasonic brazing unit for sheet metal, can solve the problem that
The deficiencies in the prior art, improve the weldquality of ultrasonic bonding.
For solving above-mentioned technical problem, the technical solution used in the present invention is as follows.
A kind of ultrasonic brazing unit for sheet metal, including ultrasonic transducer, ultrasonic transformer and weld mold, welds
Connect below mould and welding base is provided with, hydraulic stem above weld mold, is connected with, the ultrasonic transformer includes separately positioned
One end and the second end, weld mold are fixed between first end and the second end, and first end is fixed on ultrasonic waves
On energy device, balance weight is fixed with the second end, is connected with balancing pole between first end and the second end；Weld mold includes
Pedestal, pedestal are fixed between first end and the second end, are fixed with plumb joint, the outside slip cap of plumb joint below pedestal
Soldering sleeve is connected to, the length of soldering sleeve is more than the length of plumb joint, the diameter of soldering sleeve is from top to bottom gradually increased, weldering
The inner homogeneous of joint are provided with several the first cavitys, and the outside of welding base is provided with air nozzle.
Preferably, being coaxially arranged with several the first spring leafs in the first end, the first spring leaf center is run through
The two ends for having the first resonant rod, the first resonant rod are separately fixed on ultrasonic transducer and pedestal, and the first resonant rod surface sets
Several second spring pieces are equipped with, second spring piece is mutually perpendicular to the first spring leaf, the first resonant rod passes through second spring piece
With the first spring leaf interference fit.
Preferably, being provided with three the second resonant rods in the second end, the second resonant rod with the first resonant rod is
Eccentric axial is symmetrical arranged, and the two ends of the second resonant rod are fixed with pedestal and balance weight respectively, the outside of three the second resonant rods
The 3rd spring leaf is socketed with, the both sides of the 3rd spring leaf are fixed with arc-shaped spring piece, and the outside of the second resonant rod is socketed with first
Spring body.
Preferably, the balancing pole includes shell, inside the shell is provided with second spring body, and one end of second spring body is solid
Surely there is the first rubber blanket, the first rubber blanket is contacted with each other with the first spring leaf, the other end of second spring body passes through rubber intermediate plate
It is fixed on arc-shaped spring piece.
Preferably, the shell on be provided with the first adjustment bolt, the bottom of the first adjustment bolt is fixed with second
Rubber blanket, the second rubber blanket are selectively crimped with second spring body under the drive of the first adjustment bolt.
Preferably, the balance weight includes housing, if being provided with dried layer elastic bumps portion in housing, in elastic bumps portion
Selectively balancing weight is placed with, the top of housing is provided with the second adjustment bolt, and the second adjustment bolt is crimped on positioned at the superiors
Balancing weight on.
Preferably, the housing bottom is provided with the 3rd spring body, the top of the 3rd spring body is crimped on undermost
On balancing weight.
Preferably, the plumb joint be provided centrally with the second cavity, be provided with transverse slat below the second cavity, transverse slat with
Arranged in a crossed manner between the top of the second cavity have two the 3rd resonant rods, the distance of transverse slat and the second cavity floor and transverse slat and the
The ratio of distances constant of two cavity top surfaces is 1:4.
A kind of welding method of the above-mentioned ultrasonic brazing unit for sheet metal, comprises the following steps：
A, the surface to welding position are processed, and remove removing oxide layer, and weldment is placed on welding base；
B, hydraulic stem drive weld mold to move down, and so that soldering sleeve is contacted with weldment first, and footprint pressure is
150MPa～200MPa, the amplitude of plumb joint are 80 μm～150 μm, and ultrasonic power is 0.5kW～1.2kW, and weld interval is
5s～15s, dwell time are more than weld interval 3s～5s, and air nozzle sprays nitrogen to welding position, and nitrogen keeps room temperature, injection
Flow velocity is 3m/s～5m/s；
C, hydraulic stem continue to drive weld mold to move down, and so that plumb joint is contacted with weldment, and footprint pressure is
550MPa～750MPa, the amplitude of plumb joint are 10 μm～15 μm, and ultrasonic power is 2.0kW～3.0kW, and weld interval is
20s～30s, dwell time are more than weld interval 3s～5s, and air nozzle sprays nitrogen to welding position, and nitrogen keeps room temperature, spray
Jet velocity is 8m/s～12m/s；
D, hydraulic stem drive weld mold to be lifted up, and air nozzle sprays nitrogen to welding position, and nitrogen keeps room temperature, spray
Jet velocity is 25m/s～30m/s, and weldment surface temperature terminates after being down to room temperature.
The beneficial effect that is brought using technique scheme is：The present invention is improved by the structure of improvement ultrasonic transformer
The control uniformity of weld mold amplitude, and improve the transmission efficiency of the vibration sent by ultrasonic transducer.The
One adjustment bolt and the second adjustment bolt can carry out selective filter regulation to vibration, so as to improve the concentration degree of amplitude.Weldering
Connect mould to be made up of two parts, in welding, soldering sleeve is contacted with face of weld first, is tentatively welded, then again by welding
Joint completes weld job jointly with soldering sleeve.At the same time nitrogen protection and temperature control is added, the weldering of weld can be improved
The uniformity is connect, reduces the appearance of cavity and burr.When plumb joint is contacted with face of weld, soldering sleeve occurs extrusion pressing type to become, with
The contact area of welding rostral wall reduces so that the first cavity is reduced for the transmission of vibration, so as to improve plumb joint part
Vibration transmission quantity.
Description of the drawings
Fig. 1 is the structure chart of one specific embodiment of the present invention.
Fig. 2 is the structure chart of first end in one specific embodiment of the present invention.
Fig. 3 is the structure chart of the second end in one specific embodiment of the present invention.
Fig. 4 is the structure chart of balancing pole in one specific embodiment of the present invention.
Fig. 5 is the structure chart of balance weight in one specific embodiment of the present invention.
Fig. 6 is the structure chart of plumb joint in one specific embodiment of the present invention.
In figure：1st, ultrasonic transducer；2nd, base is welded；3rd, first end；4th, the second end；5th, balance weight；6th, balance
Bar；7th, hydraulic stem；8th, pedestal；9th, plumb joint；10th, soldering sleeve；11st, the first cavity；12nd, air nozzle；13rd, the first spring leaf；
14th, the first resonant rod；15th, second spring piece；16th, the second resonant rod；17th, the 3rd spring leaf；18th, arc-shaped spring piece；19th, first
Spring body；20th, shell；21st, second spring body；22nd, the first rubber blanket；23rd, rubber intermediate plate；24th, the first adjustment bolt；25th,
Two rubber blankets；26th, housing；27th, elastic bumps portion；28th, the second adjustment bolt；29th, the 3rd spring body；30th, the second cavity；31、
Transverse slat；32nd, the 3rd resonant rod；33rd, balancing weight；34th, the first passage；35th, the second passage；36th, baffle plate；37th, trapezoidal contact
End；38th, groove.
Specific embodiment
The standardized element arrived used in the present invention all can commercially, and shaped piece is according to specification and accompanying drawing
Recording can all carry out customized, and the concrete connected mode of each part is all using ripe bolt in prior art, rivet, weldering
The conventional meanses such as connect, paste, will not be described in detail herein.
Reference picture 1-6, one specific embodiment of the present invention include ultrasonic transducer 1, ultrasonic transformer and weld mold, weldering
Connect below mould and welding base 2 is provided with, hydraulic stem 7 above weld mold, is connected with, the ultrasonic transformer includes separately positioned
First end 3 and the second end 4, weld mold are fixed between first end 3 and the second end 4, and first end 3 is fixed on super
On acoustic wave transducer 1, balance weight 5 is fixed with the second end 4, is connected with balancing pole 6 between first end 3 and the second end 4；
Weld mold includes pedestal 8, and pedestal 8 is fixed between first end 3 and the second end 4, and 8 lower section of pedestal is fixed with plumb joint 9,
The outside slip cap of plumb joint 9 is connected to soldering sleeve 10, and the length of soldering sleeve 10 is more than the length of plumb joint 9, soldering sleeve
10 diameter is from top to bottom gradually increased, and the inner homogeneous of plumb joint 9 are provided with several the first cavitys 11, in welding base 2
Outside be provided with air nozzle 12.Several the first spring leafs 13,13 center of the first spring leaf are coaxially arranged with first end 3
It is separately fixed on ultrasonic transducer 1 and pedestal 8 through the two ends for having the first resonant rod 14, the first resonant rod 14, first is humorous
14 surface of bar that shakes is provided with several second spring pieces 15, and second spring piece 15 is mutually perpendicular to the first spring leaf 13, and first is humorous
The bar 14 that shakes is by second spring piece 15 and 13 interference fit of the first spring leaf.Three the second resonant rods are provided with the second end 4
16, the second resonant rod 16 is symmetrical arranged with the first resonant rod 14 as eccentric axial, the two ends of the second resonant rod 16 respectively with pedestal 8
Fix with balance weight 5, the outside of three the second resonant rods 16 is socketed with the 3rd spring leaf 17, and the both sides of the 3rd spring leaf 17 are fixed
The outside for having arc-shaped spring piece 18, the second resonant rod 16 is socketed with the first spring body 19.Balancing pole 6 includes shell 20, shell 20
Second spring body 21 is inside provided with, and one end of second spring body 21 is fixed with the first rubber blanket 22, the first rubber blanket 22 and first
Spring leaf 13 contacts with each other, and the other end of second spring body 21 is fixed on arc-shaped spring piece 18 by rubber intermediate plate 23.Shell
The first adjustment bolt 24 is provided with 20, and the bottom of the first adjustment bolt 24 is fixed with the second rubber blanket 25, the second rubber blanket
25 are selectively crimped with second spring body 21 under the drive of the first adjustment bolt 24.Balance weight 5 includes housing 26, in housing 26
If dried layer elastic bumps portion 27 is provided with, balancing weight 33 in elastic bumps portion 27, is selectively placed with, the top of housing 26 is arranged
There is the second adjustment bolt 28, the second adjustment bolt 28 is crimped on the balancing weight 33 of the superiors.26 bottom of housing is provided with
3rd spring body 29, the top of the 3rd spring body 29 are crimped on undermost balancing weight 33.Plumb joint 9 be provided centrally with
Two cavitys 30,30 lower section of the second cavity are provided with transverse slat 31, and arranged in a crossed manner between the top of transverse slat 31 and the second cavity 30 have two
Individual 3rd resonant rod 32, the distance of transverse slat 31 and 30 bottom surface of the second cavity and transverse slat 31 and the ratio of distances constant of 30 top surface of the second cavity
For 1:4.Several the first passages 34 are provided with welding base plate 2, and one end of the first passage 34 is located at the side of welding base plate 2
Wall, the other end are located at the top surface of welding base plate 2.Air nozzle 12 is located at the side of welding base plate 2, welds the other three of base plate 2
Side is respectively arranged with a baffle plate 36, and baffle plate 36 is connect with welding base plate axle.Soldering sleeve 10 is in hyperboloid of one sheet shape, welding
The bottom of sleeve pipe 10 is provided with the second passage 35, and the second passage 35 is horizontally disposed with.The bottom surface of plumb joint 9 is evenly arranged with ladder
Shape contact jaw 37, the bottom surface at trapezoidal contact end 37 arrange fluted 38.
A kind of welding method of the above-mentioned ultrasonic brazing unit for sheet metal, specifically for special in stainless steel base
The welding method of the thick aluminium strip of upper welding 0.3mm～0.5mm, comprises the following steps：
A, the surface to welding position are processed, and remove removing oxide layer, and weldment is placed on welding base 2；
B, hydraulic stem 7 drive weld mold to move down, and so that soldering sleeve 10 is contacted with weldment first, footprint pressure
For 175MPa, the amplitude of plumb joint is 100 μm, and ultrasonic power is 1.1kW, and weld interval is 11s, and the dwell time is more than welding
Time 5s, air nozzle 12 spray nitrogen to welding position, and nitrogen keeps room temperature, and injection flow velocity is 4.5m/s, and baffle plate 36 is tilted towards
Outer setting, the angle with welding base plate 2 is 150 °；
C, hydraulic stem 7 continue to drive weld mold to move down, and so that plumb joint 9 is contacted with weldment, and footprint pressure is
710MPa, the amplitude of plumb joint is 12 μm, and ultrasonic power is 2.3kW, and weld interval is 25s, and the dwell time is more than during welding
Between 5s, air nozzle 12 to welding position spray nitrogen, nitrogen keep room temperature, injection flow velocity be 11m/s, baffle plate 36 still keep walk
Telling somebody what one's real intentions are in rapid B；Hydraulic stem 7 reduces pressure, makes footprint pressure be reduced to 650MPa, and the amplitude of plumb joint 9 and power keep not
Become, this state keeps 10s, nitrogen jet speed is improved to 35m/s during this period, baffle plate 36 adjust to welding 2 phase of base plate
Mutually vertical；
D, hydraulic stem 7 drive weld mold to be lifted up, and air nozzle 12 sprays nitrogen to welding position, and nitrogen keeps room
Temperature, injection flow velocity are 28m/s, and baffle plate 36 is lain in a horizontal plane on welding base plate 2, and weldment surface temperature terminates after being down to room temperature.
The present invention improves the precision that supersonic welding termination process controls for weld seam, can by the welding scrappage of weld seam by
Existing 5 ‰ or so are reduced to 1 ‰ once.
General principle and principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel it should be appreciated that the present invention is not restricted to the described embodiments, simply explanation described in above-described embodiment and specification this
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes
Change and improvement is both fallen within scope of the claimed invention.The claimed scope of the invention by appending claims and its
Equivalent thereof.
Claims (8)
1. a kind of ultrasonic brazing unit for sheet metal, including ultrasonic transducer（1）, ultrasonic transformer and weld mold,
Welding base is provided with below weld mold（2）, above weld mold, it is connected with hydraulic stem（7）, it is characterised in that：The luffing
Bar includes separately positioned first end（3）And the second end（4）, weld mold is fixed on first end（3）And the second end
（4）Between, first end（3）It is fixed on ultrasonic transducer（1）On, the second end（4）On be fixed with balance weight（5）, first
End（3）And the second end（4）Between be connected with balancing pole（6）；Weld mold includes pedestal（8）, pedestal（8）It is fixed on first
End（3）And the second end（4）Between, pedestal（8）Lower section is fixed with plumb joint（9）, plumb joint（9）Outside slip cap be connected to
Soldering sleeve（10）, soldering sleeve（10）Length be more than plumb joint（9）Length, soldering sleeve（10）Diameter from top to bottom
It is gradually increased, plumb joint（9）Inner homogeneous be provided with several the first cavitys（11）, in welding base（2）Outside arrange
There is air nozzle（12）；The first end（3）Several first spring leaf is inside coaxially arranged with（13）, the first spring leaf（13）In
The heart runs through the first resonant rod（14）, the first resonant rod（14）Two ends be separately fixed at ultrasonic transducer（1）And pedestal（8）
On, the first resonant rod（14）Surface is provided with several second spring pieces（15）, second spring piece（15）With the first spring leaf
（13）It is mutually perpendicular to, the first resonant rod（14）By second spring piece（15）With the first spring leaf（13）Interference fit.
2. the ultrasonic brazing unit for sheet metal according to claim 1, it is characterised in that：The second end
（4）Three second resonant rods are inside provided with（16）, the second resonant rod（16）With the first resonant rod（14）Symmetrically set for eccentric axial
Put, the second resonant rod（16）Two ends respectively with pedestal（8）And balance weight（5）Fixing, three the second resonant rods（16）Outside
It is socketed with the 3rd spring leaf（17）, the 3rd spring leaf（17）Both sides be fixed with arc-shaped spring piece（18）, the second resonant rod（16）
Outside be socketed with the first spring body（19）.
3. the ultrasonic brazing unit for sheet metal according to claim 2, it is characterised in that：The balancing pole
（6）Including shell（20）, shell（20）Second spring body is inside provided with（21）, second spring body（21）One end be fixed with first
Rubber blanket（22）, the first rubber blanket（22）With the first spring leaf（13）Contact with each other, second spring body（21）The other end pass through
Rubber intermediate plate（23）It is fixed on arc-shaped spring piece（18）On.
4. the ultrasonic brazing unit for sheet metal according to claim 3, it is characterised in that：The shell（20）
On be provided with the first adjustment bolt（24）, the first adjustment bolt（24）Bottom be fixed with the second rubber blanket（25）, the second rubber
Rubber cushion（25）In the first adjustment bolt（24）Drive under with second spring body（21）Selective crimping.
5. the ultrasonic brazing unit for sheet metal according to claim 1, it is characterised in that：The balance weight
（5）Including housing（26）, housing（26）If being inside provided with dried layer elastic bumps portion（27）, elastic bumps portion（27）Upper selectivity is put
It is equipped with balancing weight（33）, housing（26）Top be provided with the second adjustment bolt（28）, the second adjustment bolt（28）Crimping is in place
Balancing weight in the superiors（33）On.
6. the ultrasonic brazing unit for sheet metal according to claim 5, it is characterised in that：The housing（26）
Bottom is provided with the 3rd spring body（29）, the 3rd spring body（29）Top be crimped on undermost balancing weight（33）On.
7. the ultrasonic brazing unit for sheet metal according to claim 1, it is characterised in that：The plumb joint
（9）Be provided centrally with the second cavity（30）, the second cavity（30）Lower section is provided with transverse slat（31）, transverse slat（31）With the second cavity
（30）Top between arranged in a crossed manner have two the 3rd resonant rods（32）, transverse slat（31）With the second cavity（30）The distance of bottom surface with
Transverse slat（31）With the second cavity（30）The ratio of distances constant of top surface is 1:4.
8. the welding side of the ultrasonic brazing unit for sheet metal described in a kind of 1～7 any one of the claims
Method, it is characterised in that comprise the following steps：
A, the surface to welding position are processed, and remove removing oxide layer, and weldment is placed on welding base（2）On；
B, hydraulic stem（7）Drive weld mold to move down, make soldering sleeve first（10）Contact with weldment, footprint pressure
For 150MPa～200MPa, the amplitude of plumb joint is 80 μm～150 μm, and ultrasonic power is 0.5kW～1.2kW, weld interval
For 5s～15s, the dwell time is more than weld interval 3s～5s, air nozzle（12）Nitrogen is sprayed to welding position, nitrogen keeps room
Temperature, injection flow velocity are 3m/s～5m/s；
C, hydraulic stem（7）Continue to drive weld mold to move down, make plumb joint（9）Contact with weldment, footprint pressure is
550MPa～750MPa, the amplitude of plumb joint are 10 μm～15 μm, and ultrasonic power is 2.0kW～3.0kW, and weld interval is
20s～30s, dwell time are more than weld interval 3s～5s, air nozzle（12）Nitrogen is sprayed to welding position, nitrogen keeps room
Temperature, injection flow velocity are 8m/s～12m/s；
D, hydraulic stem（7）Weld mold is driven to be lifted up, air nozzle（12）Nitrogen is sprayed to welding position, nitrogen keeps room
Temperature, injection flow velocity are 25m/s～30m/s, and weldment surface temperature terminates after being down to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510384993.1A CN104923906B (en) | 2015-07-05 | 2015-07-05 | A kind of ultrasonic brazing unit and its welding method for sheet metal |
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| CN201510384993.1A CN104923906B (en) | 2015-07-05 | 2015-07-05 | A kind of ultrasonic brazing unit and its welding method for sheet metal |
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| CN104923906B true CN104923906B (en) | 2017-03-08 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110666333A (en) * | 2018-07-03 | 2020-01-10 | 东莞矩华超声技术有限公司 | Spindle system of ultrasonic welding machine |
| CN112317945A (en) * | 2020-11-20 | 2021-02-05 | 佛山市顺德区冠宇达电源有限公司 | Ultrasonic welding structure |
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