CN108788395A - A kind of integral type TIG by the double wire feeds of sidewall symmetry welds nozzle and welding gun - Google Patents
A kind of integral type TIG by the double wire feeds of sidewall symmetry welds nozzle and welding gun Download PDFInfo
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- CN108788395A CN108788395A CN201810650752.0A CN201810650752A CN108788395A CN 108788395 A CN108788395 A CN 108788395A CN 201810650752 A CN201810650752 A CN 201810650752A CN 108788395 A CN108788395 A CN 108788395A
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- welding
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- feeding mouth
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- wire feeding
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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
- B23K9/00—Arc welding or cutting
- B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
- B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
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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
- B23K9/00—Arc welding or cutting
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a kind of integral type TIG by the double wire feeds of sidewall symmetry to weld nozzle and welding gun, including nozzle body, outer wire feeding mouth, guide rod, connection sliding sleeve and interior wire feeding mouth；It is opened up on the side wall of nozzle body there are two through-hole, outer wire feeding mouth is welded on nozzle body both sides and is connected to form wire feed channel with the through-hole, and interior wire feeding mouth is mounted in the outer wire feeding mouth；Guide rod is arranged coupled in the rear end of outer wire feeding mouth, and for being oriented to the direction that welding wire is sent into, connection sliding sleeve is sleeved on nozzle body top.Welding wire is sent into simultaneously from nozzle both sides, and two welding wires symmetrically from tungsten electrode front and rear while wire feed, both may make deposition rate at least to double in this way；The heat that electric arc front and rear can symmetrically be absorbed again ensure that stability of the electric arc to welding process under the symmetry and High Speed Welding of workpiece heat, meanwhile, two root wires symmetrically walk the heat that can more utilize nozzle waste heat and electric arc arc column in electric arc.
Description
Technical field
The invention discloses a kind of nozzles, and in particular to a kind of two wire guiding nipples by being symmetrically mounted on side wall carry out
The integral type TIG weldering nozzles of double wire feeds and the welding gun that the nozzle can be installed.
Background technology
Gas tungsten arc welding (TIG welderings) since electrode is non-fusible, have welding process steady, wide adaptation range,
The series of advantages such as weldquality is good, welding deformation is small, heat affected area is small, are widely applied in actual production.But this
The heat of polar region where kind welding method can only utilize workpiece, and the heat that polar region where tungsten electrode and arc column generate all is scattered and disappeared
Fall, therefore its coefficient of thermal efficiency is low, fusion penetration ability is small, deposition rate is low, speed of welding is slow, leads to its welding productivity efficiency
It is low, of high cost.
Domestic and foreign scholars in order to improve TIG weldering welding efficiency develop many efficient TIG weld techniques, as keyhole TIG,
Active TIG, double tungsten electrode TIG and heating wire TIG etc..Keyhole TIG is received by using the up to high current of 600A or more to improve electromagnetism
Contracting power and electric arc straightness, and then penetration ability is improved, the stainless steel of 12mm thickness can be disposably penetrated, but the increase of electric current is bound to
Heat affected area and its crystallite dimension can be caused to increase, joint performance variation.Active tungstic acid improves penetration by using activating agent
Ability, but activating agent uses so that welding preparation process becomes cumbersome, and also appearance of weld is obviously deteriorated, therefore,
Using being also greatly limited.The electric arc that double tungsten electrode TIG welderings are ignited using two between tungsten electrode and workpiece is welded, and is passed through
The efficient coupling of two electric arcs further increases arc stability, and significantly improves deposition rate, but this welding gun volume is big, can
It is deteriorated up to property and operating flexibility.Hot wire TIG welding preheats filler wire using additional heater supply, solves TIG
The low problem of deposition efficiency is welded, but a heated filament mouth is added on the outside of welding gun, welding gun end size significantly increases, and accessibility is determined
Position precision and operating flexibility are deteriorated, and the raising of deposition efficiency needs to utilize additional energy.In addition, above-mentioned welding method
There are problems that cost is welded than general T IG to improve, and could not fundamentally solve traditional TIG weld arc energy and utilize
The low problem of rate.SAF companies develop TOPTIG welding procedures, and by the way of by nozzle wall list wire feed, welding wire exists
The heat that nozzle and arc column area are absorbed during passing through electric arc to be sent to molten bath from tungsten electrode above or below, improves electric arc
Capacity usage ratio effectively increases deposition rate and speed of welding, moreover, the nozzle arrangements make simple, at low cost, operation side
Just, it is conducive to realize robot welding.But this technique is when further increasing deposition rate, the electric arc absorbed due to welding wire
Heat is excessively high, and workpiece does not melt substantially, the defects of so as to cause humping weld or edge incomplete fusion.For example, using
When the speed of welding of 500mm/min, the welding current of 150A, 4mm arc length carry out welding 2mm thickness stainless steels, if before tungsten electrode
Face is sent into, and when deposition rate reaches 24g/min (corresponding wire feed rate is 2.1m/min), the workpiece immediately below electric arc only melts
Change very thin one layer, such as Fig. 1 (a).This layer thin of liquid metal quick solidification prevents the welding wire metal of fusing to flow backward
It is dynamic, cause weld seam humping weld occur, as shown in Fig. 1 (b).And behind tungsten electrode when wire feed, deposition rate reaches 28.5g/min
When (corresponding wire feed rate is 2.5m/min), the workpiece fusing amount immediately below electric arc is seldom or non-fusible, as shown in Fig. 2 (a)；
Base material can not be melted when flowing to welding bead both sides of the edge and be coagulated directly above although continuously being sprawled on welding bead by molten pool metal
Gu weld seam toe of weld portion is caused to generate incomplete fusion, and zigzag is presented, as shown in Fig. 2 (b).On the other hand, in higher welding speed
Under degree, either in front of tungsten electrode or from rear wire feed, welding bead will appear bending and edge incomplete fusion phenomenon.
To sum up, TOPTIG is to improve the best approach of TIG weldering welding efficiencies, but its degree improved has larger limitation
Property；Therefore, it is necessary to be improved to the welding gun that it is used, further increase welding productivity and reduce welding cost.
Invention content
In order to solve the above technical problems, deposition rate, speed of welding and arc energy utilization rate are further increased, the present invention
It is proposed is arranged symmetrically two wire guiding nipples on nozzle, and two welding wires symmetrically from tungsten electrode front and rear while wire feed, both may be used in this way
So that deposition rate at least doubles；The heat that electric arc front and rear can symmetrically be absorbed again, ensure that electric arc to workpiece
The stability of welding process under the symmetry and High Speed Welding of heating, meanwhile, two root wires are symmetrically walked in electric arc can be more
Using the heat of nozzle waste heat and electric arc arc column, arc energy utilization rate is further increased, to further increase welding production
Efficiency simultaneously and reduces welding cost.
An object of the present invention be to provide it is a kind of be remarkably improved deposition rate and speed of welding pass through sidewall symmetry
The integral type TIG weldering nozzles and welding gun of double wire feeds.
The second object of the present invention is to provide through the integral type TIG weldering nozzles of the double wire feeds of sidewall symmetry and answering for welding gun
With.
The technical solution adopted by the present invention, it is specific as follows：
A kind of integral type TIG by the double wire feeds of sidewall symmetry welds nozzle, including nozzle body, outer wire feeding mouth, guide rod, company
Connect sliding sleeve and interior wire feeding mouth；It is symmetrically opened up on the side wall of the nozzle body there are two through-hole, the outer wire feeding mouth is welded on
The through-hole end of nozzle body both sides forms wire feed channel, and the interior wire feeding mouth is mounted in the outer wire feeding mouth；Institute
State guide rod be arranged it is coupled in the rear end of outer wire feeding mouth, for being oriented to the direction that welding wire is sent into, the connection sliding sleeve
It is sleeved on nozzle body top.
Preferably, the through-hole described in two is arranged relative to the axisymmetrical of nozzle body, can guarantee welding in this way
The axis of two root wires, the axis of tungsten electrode, axis of a weld are respectively positioned in approximately the same plane in journey, ensure that arc force, transition are molten
Drop and welding pool are symmetrical along axis of a weld and arc center's line as much as possible, are conducive to obtain stable welding
Journey and good appearance of weld.
Preferably, the axis of the through-hole and the angle of nozzle body axis are 30~40 ° so that welding wire axis with usually
The tungsten electrode end conical surface keeping parallelism for grinding out 60~80 ° of cone angles is conducive to control distance between welding wire and the tungsten electrode end conical surface,
Many experiments show that welding process is most stable when this distance is suitable with gage of wire.
Preferably, the axis collinear of the axis and through-hole of the outer wire feeding mouth, to ensure the axis and tungsten electrode axis of two welding wires
Line, axis of a weld are located in approximately the same plane, ensure arc force, transition molten drop, welding pool along axis of a weld and electricity
Arc center line is symmetrical, is conducive to obtain stable welding process and good appearance of weld.
Preferably, two sets of internal threads are machined with inside the outer wire feeding mouth, are respectively used to connection guide and interior wire feeding mouth.It adopts
The purpose being threadedly coupled is easy for replacing interior wire feeding mouth, with the welding wire suitable for different-diameter.
Preferably, the through-hole for conveying welding wire and the outer spiral shell for connecting outer wire feeding mouth are provided with inside the guide rod
Line.
Preferably, the internal thread for connecting welding gun gun body is provided with inside the connection sliding sleeve.
The present invention also provides a kind of welding guns comprising the foregoing integral type TIG by the double wire feeds of sidewall symmetry
Weld nozzle.
The present invention also provides a kind of nozzle and welding gun can be welded in machinery system by the integral type TIG of the double wire feeds of sidewall symmetry
Make the application in field.
The beneficial effects of the invention are as follows：
The present invention is symmetrically sent into the (start button of two wire-feed motors simultaneously by two root wires from the both sides of nozzle body
On wiring be together in parallel, carrying out control by a button can be realized while being sent into), compared with the unilateral wire feed of TOPTIG,
Deposition rate is doubled；Compared with traditional TIG, deposition rate can be improved 2 times.Two root wires are inhaled before being sent into molten bath
TOPTIG of the nozzle waste heat and arc column area heat of receipts also than unilateral wire feed is doubled, and reduces scattering and disappearing for arc energy, electricity
Arc capacity usage ratio improves 12.5% than traditional TIG, improves 6.2% than TOPTIG, reduces welding cost.In addition, two
Welding wire is sent into also assures that electric arc to the stability of welding process under the symmetry and High Speed Welding of workpiece heat, significantly improves simultaneously
Speed of welding.
Description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not constitute the improper restriction to the application for explaining the application.
Fig. 1 (a) welding currents are 150A, speed of welding 0.5m/min, wire feed rate 2.1m/min, before tungsten electrode
The TOPTIG welding pool forms of unilateral side wire feed when square wire feed；
Fig. 1 (b) is the corresponding appearances of weld of Fig. 1 (a)；
Fig. 2 (a) welding currents are 150A speeds of welding, 0.5m/min is wire feed rate, wire feed rate 2.5m/min, from
The TOPTIG welding pool forms of unilateral side wire feed when the wire feed of tungsten electrode rear；
Fig. 2 (b) is the corresponding appearances of weld of Fig. 2 (a)；
Fig. 3 is the structural schematic diagram of the present invention；
Fig. 4 is the nozzle body structural schematic diagram for being machined with through-hole；
Fig. 5 (a) is the structural schematic diagram of outer wire feeding mouth；
Fig. 5 (b) is the sectional view of outer wire feeding mouth；
Fig. 6 is the structural schematic diagram of guide rod；
Fig. 7 is the structural schematic diagram for connecting sliding sleeve；
Fig. 8 is the structural schematic diagram of interior wire feeding mouth；
Fig. 9 is the assembling schematic diagram of the present invention and welding gun and wire feed system；
Figure 10 (a), the present invention obtain stable welding under the speed of welding, 5.0m/min wires feed rate of 0.8m/min
Process schematic；
Figure 10 (b) is the weld seam of Figure 10 (a) formings.
In figure:1. nozzle body, 2. outer wire feeding mouths, 3. guide rods, 4. connection sliding sleeves, wire feeding mouth in 5., 6. nozzle walls
Through-hole, the internal thread inside 7. outer wire feeding mouths, the internal thread inside 8. outer wire feeding mouths, the through-hole inside 9. guide rods, outside 10. guide rods
The external screw thread in portion, 11. connect the internal thread inside sliding sleeves, 12. welding guns, 13. wire-feeding pipe, 14. welding wire.
Specific implementation mode
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof；
In order to facilitate narration, if there is "upper", "lower", " left side " " right side " printed words, only expression and attached drawing itself in the present invention
Upper and lower, left and right direction it is consistent, not to structure rise restriction effect, it is only for convenient for description the present invention and simplification retouch
It states, does not indicate or imply the indicated equipment or element must have a particular orientation, with specific azimuth configuration and operation,
Therefore it is not considered as limiting the invention.
Term explains part:The terms such as term " installation ", " connected ", " connection ", " fixation " in the present invention should do broad sense
Understand, for example, it may be being fixedly connected, may be a detachable connection, or be integrated；Can be directly connected to, can also be
Indirectly connected through an intermediary, can be the interaction relationship of connection or two elements inside two elements, for this
For the those of ordinary skill in field, above-mentioned term can be understood in concrete meaning of the invention as the case may be.
As background technology is introduced, technique in the prior art is in the case where further increasing speed of welding or wire feed rate
When, the defects of weld seam also will appear hump and weld edge incomplete fusion；Under same welding current, with the increasing of speed of welding
Add, this wire feed rate limiting value is gradually reduced, and in order to solve technical problem as above, present applicant proposes one kind passing through side wall
The integral type TIG of symmetric double wire feed welds nozzle.
A kind of typical embodiment of the application as shown in figure 3, the bis- wire feeds of TIG that fill silk nozzle, including：Nozzle body
1, outer wire feeding mouth 2, guide rod 3, connection sliding sleeve 4, interior wire feeding mouth 5.
It is opened on the side wall of nozzle body 1 there are two through-hole 6, the outer wire feeding mouth 2 is welded on nozzle both sides, the guide rod 3
It is connected with outer wire feeding mouth 2,2 one end of outer wire feeding mouth is connected to through-hole 6, and the other end is connected to guide rod 3,4 sets of the connection sliding sleeve
Mounted on 1 top of nozzle body, the interior wire feeding mouth (5) is mounted on inside outer wire feeding mouth.The present invention is by two root wires from spray
The both sides of mouth ontology symmetrically simultaneously be sent into (wiring in the start button of two wire-feed motors is together in parallel, by a button into
Row control can be realized while be sent into), compared with the unilateral wire feed of TOPTIG, deposition rate is doubled；With traditional TIG phases
Than deposition rate can be improved 2 times.The nozzle waste heat and arc column area heat that two root wires are absorbed before being sent into molten bath are also than list
The TOPTIG of side wire feed is doubled, and reduces scattering and disappearing for arc energy, arc energy utilization rate is improved than traditional TIG
12.5%, 6.2% is improved than TOPTIG, reduces welding cost.In addition, two root wires are sent into simultaneously also assures electric arc pair
The stability of welding process, significantly improves speed of welding under the symmetry and High Speed Welding of workpiece heat.
In this example, as shown in Figure 4, it is preferred that the nozzle body 1 is provided with through-hole 6 in symmetrical both sides, described logical
The axis in hole 6 and the angle of nozzle-axis are 30~400, so that welding wire axis and the tungsten electrode for usually grinding out 60~80 ° of cone angles
End conical surface keeping parallelism is conducive to the adjustment for adjusting distance between welding wire and the tungsten electrode end conical surface in the welding process, largely
Experiment shows that welding process is most stable when this distance is suitable with gage of wire.
Further preferred embodiment, the axis of through-hole 6 and the angle of nozzle-axis are 40 °.
Two through-holes are symmetrically set；It can guarantee two root wire axis, the axis of tungsten electrode, weldering in the welding process in this way
Seam center line is respectively positioned in approximately the same plane, ensures arc force, transition molten drop, welding pool along in axis of a weld and electric arc
Heart line is symmetrical, is conducive to obtain stable welding process and good appearance of weld.
In this example, it is preferred that the axis collinear of the axis and through-hole 6 of the outer wire feeding mouth 2.To ensure two welding wires
Axis is located at tungsten electrode axis, axis of a weld in approximately the same plane, ensures arc force, transition molten drop, welding pool along weldering
It stitches center line and arc center's line is symmetrical, be conducive to obtain stable welding process and good appearance of weld.
In this example, as shown in Figure 5, it is preferred that it is machined with internal thread 7 and internal thread 8 inside the outer wire feeding mouth 2,
Internal thread 7 is used for connection guide 3, and internal thread 8 is for connecting interior wire feeding mouth 5；The purpose of threaded connection is easy for the installation of welding wire,
It is conveniently replaceable interior wire feeding mouth simultaneously.
In this example, as shown in Figure 6, it is preferred that be provided with inside the guide rod 3 through-hole 9 for conveying welding wire and
External screw thread 10 for connecting outer wire feeding mouth.
In this example, as shown in Figure 9, it is preferred that the other end of the guide rod 3 is connected with wire-feeding pipe 13, and wire feed is effective
In wire feed.
In this example, as shown in Figure 7, it is preferred that the internal thread for connecting welding gun is provided with inside the connection sliding sleeve 4
(11)。
In this example, as shown in Figure 9, it is preferred that nozzle is fixed on welding gun by the connection sliding sleeve 4.
Using above-mentioned apparatus, the present invention is tested, as shown in Figure 10 (a) and 10 (b), in the welding speed of 0.8m/min
Stable welding process (shown in such as Figure 10 (a)) and good appearance of weld are obtained under degree, 5.0m/min wires feed rate (as schemed
Shown in 10 (b)), deposition rate has reached 57.0g/min.
In addition, the present invention also provides a kind of welding guns comprising the foregoing one by the double wire feeds of sidewall symmetry
Formula TIG welds nozzle, and existing device may be used in rest part.
The present invention also protects the application of integral type TIG the weldering nozzle and welding gun in mechanical manufacturing field, including each
Kind food machinery, dynamic power machine, handling machinery, agricultural machinery, metallurgical and mining machinery, chemical machinery, textile machine, machine
The industry of the productions such as bed, tool, instrument, instrument and other mechanical equipments.
Examples detailed above is only a kind of currently preferred example, and the interest field of the present invention cannot be limited with this example.
Any unsubstantiality variations and alternatives that those skilled in the art is done on the basis of the present invention belong to the present invention and are wanted
Seek the range of protection.
Claims (8)
1. a kind of integral type TIG carrying out double wire feeds by two wire guiding nipples being symmetrically mounted on side wall welds nozzle, feature
It is, including nozzle body, outer wire feeding mouth, guide rod, connection sliding sleeve and interior wire feeding mouth；
Opened up on the side wall of the nozzle body there are two through-hole, the outer wire feeding mouth be welded on nozzle body both sides with it is described
Through-hole is connected to form wire feed channel, and the interior wire feeding mouth is mounted in the outer wire feeding mouth；The guide rod setting is outside
The rear end of wire feeding mouth is coupled, and for being oriented to the direction that welding wire is sent into, the connection sliding sleeve is sleeved on nozzle body
Portion.
2. welding nozzle by the integral type TIG of the double wire feeds of sidewall symmetry as described in claim 1, which is characterized in that two institutes
The through-hole stated is arranged relative to the axisymmetrical of nozzle body.
3. welding nozzle by the integral type TIG of the double wire feeds of sidewall symmetry as described in claim 1, which is characterized in that described logical
The axis in hole and the angle of nozzle body axis are 30~40 °.
4. welding nozzle by the integral type TIG of the double wire feeds of sidewall symmetry as described in claim 1, which is characterized in that described outer
The axis of wire feeding mouth and the axis collinear of through-hole.
5. welding nozzle by the integral type TIG of the double wire feeds of sidewall symmetry as described in claim 1, which is characterized in that described outer
It is machined with inside wire feeding mouth for the internal thread I of connection guide and interior wire feeding mouth, internal thread II.
6. welding nozzle by the integral type TIG of the double wire feeds of sidewall symmetry as described in claim 1, which is characterized in that described to lead
The through-hole for conveying welding wire and the external screw thread for connecting outer wire feeding mouth are provided with inside bar.
7. welding nozzle by the integral type TIG of the double wire feeds of sidewall symmetry as described in claim 1, which is characterized in that the company
Connect the internal thread being provided with inside sliding sleeve for connecting welding gun.
8. a kind of welding gun, which is characterized in that it includes any one by the double wire feeds of sidewall symmetry of claim 1-7
Formula TIG welds nozzle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810650752.0A CN108788395A (en) | 2018-06-22 | 2018-06-22 | A kind of integral type TIG by the double wire feeds of sidewall symmetry welds nozzle and welding gun |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810650752.0A CN108788395A (en) | 2018-06-22 | 2018-06-22 | A kind of integral type TIG by the double wire feeds of sidewall symmetry welds nozzle and welding gun |
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Cited By (7)
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| CN109332856A (en) * | 2018-11-21 | 2019-02-15 | 江苏科技大学 | A kind of TOPTIG mariages soldering method |
| CN109332857A (en) * | 2018-11-21 | 2019-02-15 | 江苏科技大学 | A kind of hollow tungsten electrode TOPTIG soldering method |
| CN110587075A (en) * | 2019-08-20 | 2019-12-20 | 南京理工大学 | Nozzle coaxial self-selection multi-hot-wire plasma arc metal composite additive method and device |
| CN112108736A (en) * | 2019-11-26 | 2020-12-22 | 广东镱宝电机有限公司 | Welding gun nozzle, welding gun wire feeding assembly and welding gun |
| CN112439985A (en) * | 2019-09-04 | 2021-03-05 | 南京理工大学 | Wire and nozzle co-heating plasma arc additive device and method |
| WO2021119870A1 (en) * | 2019-12-20 | 2021-06-24 | Universidad De Antofagasta | Guide device that can be adapted to different wire diameters for cold-wire tungsten inert gas (tig) welding |
| CN115156706A (en) * | 2022-07-22 | 2022-10-11 | 无锡超强伟业科技有限公司 | Handheld laser welding device with double wire feeding structures |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109332856A (en) * | 2018-11-21 | 2019-02-15 | 江苏科技大学 | A kind of TOPTIG mariages soldering method |
| CN109332857A (en) * | 2018-11-21 | 2019-02-15 | 江苏科技大学 | A kind of hollow tungsten electrode TOPTIG soldering method |
| CN110587075A (en) * | 2019-08-20 | 2019-12-20 | 南京理工大学 | Nozzle coaxial self-selection multi-hot-wire plasma arc metal composite additive method and device |
| CN112439985A (en) * | 2019-09-04 | 2021-03-05 | 南京理工大学 | Wire and nozzle co-heating plasma arc additive device and method |
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| CN115156706A (en) * | 2022-07-22 | 2022-10-11 | 无锡超强伟业科技有限公司 | Handheld laser welding device with double wire feeding structures |
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Application publication date: 20181113 |
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| RJ01 | Rejection of invention patent application after publication |