CN108188525A - The Horizontal nitrogen protection soldering oven and welding method of a kind of honeycomb sheet metal forming - Google Patents
The Horizontal nitrogen protection soldering oven and welding method of a kind of honeycomb sheet metal forming Download PDFInfo
- Publication number
- CN108188525A CN108188525A CN201810220555.5A CN201810220555A CN108188525A CN 108188525 A CN108188525 A CN 108188525A CN 201810220555 A CN201810220555 A CN 201810220555A CN 108188525 A CN108188525 A CN 108188525A
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- China
- Prior art keywords
- flue
- nitrogen
- soldering oven
- sheet metal
- metal forming
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Classifications
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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
- B23K1/008—Soldering within a furnace
-
- 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
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
- B23K1/0014—Brazing of honeycomb sandwich structures
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
Horizontal nitrogen the present invention relates to honeycomb sheet metal forming protects soldering oven and welding method, the soldering oven includes pedestal, flue, fire door, heating system, airflow circulating system, wherein flue is in horizontal setting, soldering oven further includes the furnace shell being movably arranged at along flue length direction on pedestal, it is arranged on the furnace lining of furnace shell inner wall, for the pumped vacuum systems that will be vacuumized in flue, for being filled with the confession nitrogen protecting system of nitrogen into flue, wherein furnace shell matches with fire door and coats flue, heating system is arranged on furnace lining, when forming cavity, heating system is between furnace lining and flue, and the nitrogen being passed through in flue can be preheated.Solder is protected by nitrogen for one aspect of the present invention and heating makes its fusing, so that it is guaranteed that quality after welding；On the other hand by external and flue the mobile docking of heating system, and the nitrogen for being passed through flue is preheated, not only reduces energy consumption, and flue cooling is accelerated, improve shaping efficiency.
Description
Technical field
The invention belongs to soldering oven apparatus fields, and in particular to a kind of Horizontal nitrogen protection soldering of honeycomb sheet metal forming
Stove also relates to a kind of welding method of honeycomb sheet metal forming.
Background technology
Soldering refers to that solder and weldment less than weldment fusing point while heated to after brazing filler metal melts temperature, utilize liquid pricker
The gap of material filling solid workpieces makes the welding method that metal connects.
Specifically, brazing process：The oxidation film and greasy dirt on removal base material contact surface are first had to, it is then that surface clean is good
Workpiece be assembled together with connecting form, solder is placed near play movement or between play movement.When workpiece and solder
After being heated to a little higher than solder melting temperature, brazing filler metal melts（Workpiece is unfused）, and be inhaled into and be full of by capillarity
Between solid workpieces gap, liquid solder and workpiece metal mutual diffusion dissolution form soldered fitting after condensation.
At present, used by honeycomb sheet metal forming soldering oven its include furnace body, fire door, heating system and air-flow substantially and follow
Loop system, wherein in airflow circulating so that brazing filler metal melts, and be inhaled by capillarity and full of solid workpieces gap it
Between, it is then cooling down, is completing welding.
However, there are following defects for above-mentioned soldering oven：
1st, during honeycomb sheet metal forming, cooling velocity is slow, and the efficiency welded is low；
2nd, heating system is located in furnace body, after completing welding, needs very long one end time cooling, therefore, heating system is long-term
Expand with heat and contract with cold small, the service life used is very low；
There is no nitrogen to be protected when the 3rd, welding, can not ensure the quality of welding.
Invention content
The technical problems to be solved by the invention are to overcome the deficiencies of the prior art and provide a kind of improved honeycomb sheet metal forming
Horizontal nitrogen protects soldering oven, and one side makes it after evacuation by entering nitrogen, by nitrogen to the heating of solder
Fusing, so that it is guaranteed that quality after welding；On the other hand by external and flue the mobile docking of heating system, and to being passed through stove
The nitrogen of courage is preheated, and not only reduces energy consumption, and directly remove heating system after the completion of welding so that flue cooling adds
Speed improves the molding efficiency of cellular board.
Meanwhile the invention further relates to a kind of welding methods of honeycomb sheet metal forming, are protected and heated by nitrogen so that
Brazing filler metal melts, and be inhaled into and full of between solid workpieces gap by capillarity；Then by the separation of heating system, thus
The quick cooling for realizing flue, and then improve welding efficiency.
In order to solve the above technical problems, the technical solution that the present invention takes is as follows：
A kind of Horizontal nitrogen protection soldering oven of honeycomb sheet metal forming, includes pedestal, is set on the base and internal formed fills
Expect flue, fire door, heating system, the airflow circulating system in region, wherein flue is in horizontal setting, and soldering oven is further included along stove
Courage length direction is movably arranged on pedestal and can coat flue and form the furnace shell of cavity, be arranged on furnace shell inner wall
Furnace lining, for by the pumped vacuum systems vacuumized in flue, for be filled with into flue nitrogen supply nitrogen protecting system, wherein
Furnace shell matches with fire door and coats flue, and heating system is arranged on furnace lining, and when forming cavity, heating system is in furnace lining
Between flue, and the nitrogen being passed through in flue can be preheated.
Preferably, heating system is included along the equally distributed multiple heating units of furnace shell length direction, wherein each add
Hot cell is set in a ring around the circumferential direction of furnace lining inner wall.Can be in series or in parallel between multiple heating units.
A specific implementation according to the present invention and preferred aspect, heating unit include circumferentially disposed along furnace lining inner wall
High temperature resistant resistance band, for high temperature resistant resistance band to be located in the ceramic connecting piece on furnace lining, wherein ceramic connecting piece is by resistance to height
Warm resistance band is separately set with furnace lining.
Preferably, connected for nitrogen protecting system including one end with flue and be arranged on the air supply pipe of flue periphery, with
The nitrogen gas tank and be arranged on the air valve for being capable of adjusting gas flow at the gas port of nitrogen gas tank that air supply pipe the other end is connected.
Specifically, air supply pipe is along flue length direction, helically formula is wrapped in flue periphery.Air supply pipe is stainless using 304
Steel pipe.
Further, uniformly gather the nozzle for being equipped with and being connected with air supply pipe in flue bottom.Convenient for uniformly dissipating for air-flow
It opens.
Further, it is further included for nitrogen protecting system and is arranged on fire door to detect the pressure of flue air pressure inside
Table, the Safety control valve for being arranged on fire door and being connected with pressure gauge, wherein air valve are connected with Safety control valve, work as flue
When internal air pressure exceeds setting value, Safety control valve is vented and warns automatically, and air valve, which is closed, stops gas supply.
Another specific implementation according to the present invention and preferred aspect, are additionally provided with kuppe, airflow circulating system in flue
System includes the circulating fan being arranged on fire door, the fan blade driven by circulating fan being arranged on the inside of fire door.
Preferably, circulating fan carries water-cooling system, and fan blade lower part is furnished with wind shield, and the workpiece in hot wind from charging region leans on
After the end of nearly fire door is sucked out, flue is back to by kuppe, constitutes circulating current, so as to reach the uniform of temperature.
The present invention another technical solution be：A kind of welding method of honeycomb sheet metal forming, the process employs above-mentioned
Horizontal nitrogen protects soldering oven, and in welding, and furnace shell is coated on the periphery of flue and forms the cavity being closed with fire door, so
Afterwards by vacuum extractor by vacuumizing in flue, nitrogen is then passed through into the flue, while heating system is opened, it is right
The nitrogen being passed through in flue is preheated, then as the temperature rise of flue, and under the action of the circulatory system so that solder
It is heated evenly and melts, be then inhaled by capillarity and full of between solid workpieces gap, then will carry heating system
The furnace shell of system is detached with flue, to realize the fast cooling shaping of flue and internal cellular plate.
Due to the implementation of above technical scheme, the present invention has the following advantages that compared with prior art：
One aspect of the present invention makes its fusing after evacuation by entering nitrogen, by nitrogen to the heating of solder, so that it is guaranteed that weldering
Connect rear quality；On the other hand by external and flue the mobile docking of heating system, and the nitrogen for being passed through flue is carried out pre-
Heat not only reduces energy consumption, and directly removes heating system after the completion of welding so that flue cooling accelerates, and improves cellular board
Molding efficiency.
Description of the drawings
Fig. 1 is the schematic front view of soldering oven of the present invention（In unwelded state）；
Fig. 2 is the left view schematic diagram of Fig. 1（Omit the structures such as furnace shell and heating system in Fig. 1）；
Wherein：1st, pedestal；1a, sliding rail；2nd, flue；3rd, fire door；3a, switching mechanism；30a, shaft；31a, overturning armed lever；30b、
Rotating junction；4th, heating system；40th, heating unit；400th, high temperature resistant resistance band；401st, ceramic connecting piece；5th, airflow circulating
System；50th, circulating fan；51st, fan blade；52nd, wind shield；6th, furnace shell；6a, idler wheel；7th, furnace lining；8th, for nitrogen protecting system；80、
Air supply pipe；81st, nozzle；9th, kuppe.
Specific embodiment
Above-mentioned purpose, feature and advantage to enable the application are more obvious understandable, below in conjunction with the accompanying drawings to the application
Specific embodiment be described in detail.Many details are elaborated in the following description in order to fully understand this Shen
Please.But the application can be much to implement different from other manner described here, those skilled in the art can be not
Similar improvement is done in the case of violating the application intension, therefore the application is not limited by following public specific embodiment.
In the description of the present application, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer ", " up time
The orientation or position relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be based on orientation shown in the drawings or
Position relationship is for only for ease of description the application and simplifies description rather than instruction or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore it is not intended that limitation to the application.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present application, " multiple " are meant that at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In this application unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
It connects or is electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in this application can be understood as the case may be.
In this application unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature right over second feature or oblique upper or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward or is merely representative of fisrt feature level height less than second feature.It needs
It is bright, when element is referred to as " being fixed on " or " being set to " another element, it can directly on another element or
There may also be elements placed in the middle.When an element is considered as " connection " another element, it can be directly to separately
One element may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " on ", " under ",
For illustrative purposes only, it is unique embodiment to be not offered as "left", "right" and similar statement.
The present invention will be further described in detail with specific embodiment below in conjunction with the accompanying drawings.
Ginseng is seen figure 1 and figure 2, the Horizontal nitrogen protection soldering oven of honeycomb sheet metal forming provided in this embodiment, packet
Pedestal 1 is included, is arranged on pedestal 1 and internal flue 2, fire door 3, heating system 4, the airflow circulating system 5 for forming charging region,
Wherein flue 2 is in horizontal setting（It is namely horizontally disposed）, soldering oven is further included to be movably arranged at along 2 length direction of flue
On pedestal 1 and flue 2 can be coated and form the furnace shell 6 of cavity, the furnace lining 7 for being arranged on 6 inner wall of furnace shell, for by flue 2
The pumped vacuum systems inside vacuumized（It is not shown in figure）, for be filled with into flue 2 nitrogen supply nitrogen protecting system 8, wherein
Furnace shell 6 matches with fire door 3 and coats flue 2, and heating system 4 is arranged on furnace lining 7, when forming cavity, at heating system 4
Between furnace lining 7 and flue 2, and the nitrogen being passed through in flue 2 can be preheated.
Specifically, being equipped with sliding rail 1a on pedestal 1, being equipped in the bottom of furnace shell 6 can be slidably arranged on sliding rail 1a
Idler wheel 6a, wherein sliding rail 1a are extended along the length direction of flue 2.
Flue 2 uses stainless steel（SUS316L）It is welded.It, can be in the inside of flue 2 in order to increase its structural strength
It is molded equipped with structure weldings such as Muffles, while weld seam passes through detection of pressurizeing again after welding, it is ensured that will not be leaked under high-pressure situations.
Flue is closed, while matched with furnace shell 6 by flue for 2 mouthfuls by fire door 3 by being located at the switching mechanism 3a of 2 side of flue
2 are sealed in furnace shell 6.
Specifically, switching mechanism 3a includes the shaft 30a extended along vertical direction；It is set on the base and turns for driving
The drive motor of axis 30a rotations（It is not shown in figure）；One end is fixed on shaft 30a, the other end and 3 outside of fire door rotate
The overturning armed lever 31a of connection.
In this example, overturning armed lever 31a has two, and about 3 middle part setting symmetrical above and below of fire door, while is also set in fire door 3
There is rotating junction 3b, end and the rotating junction 3b of overturning armed lever 31a are pivotally connected.
Heating system 4 is included along the equally distributed multiple heating units 40 of 6 length direction of furnace shell, wherein each heating is single
Member 40 is set in a ring around the circumferential direction of 7 inner wall of furnace lining.Can be in series or in parallel between multiple heating units 40.Annular is set
It puts and is evenly heated convenient for the circumferential direction of flue 2.
Heating unit 40 is included along the circumferentially disposed high temperature resistant resistance band 400 of 7 inner wall of furnace lining, for by high temperature resistant resistance
Ceramic connecting piece 401 on furnace lining 7 is located in 400, and wherein ceramic connecting piece 401 is by high temperature resistant resistance band 400 and 7 phase of furnace lining
It is arranged at intervals.
Kuppe 9 is additionally provided in flue 2, airflow circulating system 5 includes the circulating fan 50 being arranged on fire door 3, sets
Put the fan blade 51 driven by circulating fan 50 in 3 inside of fire door.
In this example, circulating fan 50 carries water-cooling system, and 51 lower part of fan blade is furnished with wind shield 52, and hot wind is from charging region
After workpiece is sucked out close to the end of fire door, flue 2 is back to by kuppe 9, constitutes circulating current, so as to reach temperature
Uniformly.
It is connected for nitrogen protecting system 8 including one end with flue 2 and is arranged on the air supply pipe 80 of 2 periphery of flue, with supplying
The nitrogen gas tank that 80 the other end of tracheae is connected（It is not shown in figure）, be arranged at the gas port of nitrogen gas tank being capable of adjusting gas flow
Air valve（It is not shown in figure, but it is contemplated that）, be arranged on fire door 3 for detect 2 air pressure inside of flue pressure gauge, setting
The Safety control valve being connected on fire door 3 and with pressure gauge, wherein air valve are connected with Safety control valve, inside flue 2
Air pressure exceed setting value when, Safety control valve is vented and warns automatically, air valve be closed stop gas supply.
Specifically, air supply pipe 80 is along 2 length direction of flue, helically formula is wrapped in 2 periphery of flue.Air supply pipe uses 304
Stainless steel tube.
Further, uniformly gather the nozzle 81 for being equipped with and being connected with air supply pipe 80 in 2 bottom of flue.Convenient for the equal of air-flow
It is even to scatter.
In conclusion the present embodiment specific implementation is as follows：
In welding, furnace shell is coated on the periphery of flue and forms the cavity being closed with fire door, it then will by vacuum extractor
Vacuumizing in flue is then passed through nitrogen, while heating system is opened into the flue, to the nitrogen being passed through in flue
It being preheated, then as the temperature rise of flue, and under the action of the circulatory system so that solder is heated evenly and melts,
Then it is inhaled by capillarity and full of between solid workpieces gap, then divides the furnace shell with heating system and flue
From to realize the fast cooling shaping of flue and internal cellular plate.
The present invention is described in detail above, its object is to allow the personage for being familiar with this field technology that can understand this
The content of invention is simultaneously implemented, and it is not intended to limit the scope of the present invention, all Spirit Essence institutes according to the present invention
The equivalent change or modification of work should all cover within the scope of the present invention.
Claims (10)
1. a kind of honeycomb sheet metal forming Horizontal nitrogen protection soldering oven, include pedestal, be arranged on the pedestal and inside
Form flue, fire door, heating system, the airflow circulating system in charging region, it is characterised in that：The flue is set in horizontal
Put, the soldering oven further include along the flue length direction be movably arranged on the pedestal and can will described in
Flue coats and form the furnace shell of cavity, is arranged on the furnace shell inner wall furnace lining, the pumping for will be vacuumized in the flue
Vacuum system, the confession nitrogen protecting system for being filled with nitrogen into the flue, wherein the furnace shell and the fire door
It matches and coats the flue, the heating system is arranged on the furnace lining, described when forming the cavity
Heating system is between the furnace lining and the flue, and the nitrogen being passed through in the flue can be preheated.
2. the Horizontal nitrogen protection soldering oven of honeycomb sheet metal forming according to claim 1, it is characterised in that：Described adds
Hot systems are included along the equally distributed multiple heating units of furnace shell length direction, wherein each heating unit is around described
The circumferential direction of furnace lining inner wall is set in a ring.
3. the Horizontal nitrogen protection soldering oven of honeycomb sheet metal forming according to claim 2, it is characterised in that：The heating
Unit is included along the circumferentially disposed high temperature resistant resistance band of the furnace lining inner wall, for the high temperature resistant resistance band to be located in institute
The ceramic connecting piece on furnace lining is stated, wherein the ceramic connecting piece separately sets the high temperature resistant resistance band with the furnace lining
It puts.
4. the Horizontal nitrogen protection soldering oven of honeycomb sheet metal forming according to claim 1, it is characterised in that：The confession
Nitrogen protecting system is connected including one end with the flue and is arranged on the air supply pipe of the flue periphery and the air supply pipe
The nitrogen gas tank and be arranged on the air valve for being capable of adjusting gas flow at the gas port of the nitrogen gas tank that the other end is connected.
5. the Horizontal nitrogen protection soldering oven of honeycomb sheet metal forming according to claim 4, it is characterised in that：The confession
Along the flue length direction, helically formula is wrapped in the flue periphery to tracheae.
6. the Horizontal nitrogen protection soldering oven of honeycomb sheet metal forming according to claim 4, it is characterised in that：Described
Uniformly gather the nozzle for being equipped with and being connected with the air supply pipe for flue bottom.
7. the Horizontal nitrogen protection soldering oven of honeycomb sheet metal forming according to claim 4, it is characterised in that：The confession
Nitrogen protecting system, which further includes, to be arranged on fire door to detect the pressure gauge of the flue air pressure inside, be arranged on the fire door
Safety control valve that is upper and being connected with the pressure gauge, wherein the air valve is connected with the Safety control valve, works as institute
When stating the air pressure inside flue beyond setting value, the Safety control valve is vented and warns automatically, and air valve closure is stopped
Only supply.
8. the Horizontal nitrogen protection soldering oven of honeycomb sheet metal forming according to claim 1, it is characterised in that：In the stove
Be additionally provided with kuppe in courage, the airflow circulating system include the circulating fan being arranged on the fire door, be arranged on it is described
The fan blade driven by the circulating fan on the inside of fire door.
9. the Horizontal nitrogen protection soldering oven of honeycomb sheet metal forming according to claim 8, it is characterised in that：Described follows
Ring wind turbine carries water-cooling system, and the fan blade lower part is furnished with wind shield, and hot wind is from the workpiece in charging region close to the end of fire door
After portion is sucked out, the flue is back to by the kuppe, constitutes circulating current, so as to reach the uniform of temperature.
10. a kind of welding method of honeycomb sheet metal forming, it is characterised in that：The process employs any one of claims 1 to 9
The Horizontal nitrogen protection soldering oven, and in welding, furnace shell is coated on the periphery of flue and forms what is be closed with fire door
Then vacuumizing in flue is then passed through nitrogen, while heating system by cavity by vacuum extractor into the flue
It opens, the nitrogen being passed through in flue is preheated, then as the temperature rise of flue, and under the action of the circulatory system,
So that solder is heated evenly and melts, then it is inhaled by capillarity and full of between solid workpieces gap, then by band
The furnace shell for having heating system is detached with flue, to realize the fast cooling shaping of flue and internal cellular plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810220555.5A CN108188525A (en) | 2018-03-16 | 2018-03-16 | The Horizontal nitrogen protection soldering oven and welding method of a kind of honeycomb sheet metal forming |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810220555.5A CN108188525A (en) | 2018-03-16 | 2018-03-16 | The Horizontal nitrogen protection soldering oven and welding method of a kind of honeycomb sheet metal forming |
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| CN108188525A true CN108188525A (en) | 2018-06-22 |
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Cited By (4)
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| CN112775508A (en) * | 2019-11-11 | 2021-05-11 | 湖北伊克斯热交换系统有限公司 | Welding method for hollow workpiece |
| CN114483530A (en) * | 2021-12-31 | 2022-05-13 | 山东微波电真空技术有限公司 | Horizontal exhaust equipment |
| CN116921794A (en) * | 2023-09-05 | 2023-10-24 | 三河市海旭环保设备有限公司 | Vacuum welding furnace capable of intelligently controlling temperature for semiconductor welding |
| CN117283135A (en) * | 2023-11-27 | 2023-12-26 | 西安远飞航空技术发展有限公司 | Welding method for closed shell |
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| CN112775508A (en) * | 2019-11-11 | 2021-05-11 | 湖北伊克斯热交换系统有限公司 | Welding method for hollow workpiece |
| CN114483530A (en) * | 2021-12-31 | 2022-05-13 | 山东微波电真空技术有限公司 | Horizontal exhaust equipment |
| CN114483530B (en) * | 2021-12-31 | 2024-03-26 | 山东微波电真空技术有限公司 | Horizontal exhaust equipment |
| CN116921794A (en) * | 2023-09-05 | 2023-10-24 | 三河市海旭环保设备有限公司 | Vacuum welding furnace capable of intelligently controlling temperature for semiconductor welding |
| CN116921794B (en) * | 2023-09-05 | 2024-04-05 | 三河市海旭环保设备有限公司 | Vacuum welding furnace capable of intelligently controlling temperature for semiconductor welding |
| CN117283135A (en) * | 2023-11-27 | 2023-12-26 | 西安远飞航空技术发展有限公司 | Welding method for closed shell |
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Inventor after: He Yingqiang Inventor before: Jin Jiang Inventor before: He Yingqiang |