CN105414727B - A kind of method and frock of the radiating of tubing welding process - Google Patents
A kind of method and frock of the radiating of tubing welding process Download PDFInfo
- Publication number
- CN105414727B CN105414727B CN201511012985.0A CN201511012985A CN105414727B CN 105414727 B CN105414727 B CN 105414727B CN 201511012985 A CN201511012985 A CN 201511012985A CN 105414727 B CN105414727 B CN 105414727B
- Authority
- CN
- China
- Prior art keywords
- heat conducting
- conducting film
- air
- tubing
- guide wall
- 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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
- B23K9/323—Combined coupling means, e.g. gas, electricity, water or the like
-
- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/003—Cooling means
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The method and frock of a kind of tubing welding process radiating belong to welding technology field, more particularly to the method and frock of a kind of radiating of tubing welding process.The present invention provides the method and frock of a kind of high, good heat dissipation effect the tubing welding process radiating of welding efficiency.The frock of tubing welding process radiating of the present invention includes air guide wall arc and heat conducting film, and its structural feature heat conducting film is wrapped in tubing weld seam both sides；Multiple gas guide nozzles are provided with the air guide wall arc；Each gas guide nozzle export direction is tilted and is directed away from the heat conducting film of the weld seam, in center condensed form；Air guide wall arc one end is provided with air inlet.
Description
Technical field
The invention belongs to welding technology field, more particularly to the method and frock of a kind of radiating of tubing welding process.
Background technology
Because alloy steel products crystallization temperature interval range is larger, crystallization fire check is also easy to produce in welding process.Wherein, welding rod
Arc welding receives crater crack caused by arc, and weld seam longitudinal crack belongs to fire check caused by submerged-arc welding.Therefore, welding process
In must strictly control control interlayer temperature, reduce deposited metal crystallization time, the probability for effectively controlling fire check to occur.With
Exemplified by the thermally sensitive steel such as P91, P92, in order to avoid the generation of fire check, interlayer temperature is must assure that in welding process
Not higher than 300 DEG C；Once overtemperature is easily cracked.However, in actual Lincoln weld welding process, some minor caliber pipes
Easily there is overheating problem.For example, ID432 × 72mm/P91 tubing, using Φ 3.2mm welding wires, continuous welding 30-40 minutes are
There is overheating problem, arc 10-15 minutes need to be stopped, wait that naturally cool to less than 300 DEG C is welded again；ID349×100mm/P92
Tubing, using Φ 2.4mm welding wires, 50-60 points of welding, arc 10-15 minutes need to be stopped, carried out again after naturally cool to less than 300 DEG C
Welding.This phenomenon it is serious have impact on welding efficiency, add welding point quantity, also increase and produce the several of weld defect
Rate.
On the other hand, the steel such as P91 belongs to air-cooled martensitic steel, has structure sensitive properties, the hydrogen in postwelding martensite transfor mation
Residued in hypersaturated state in martensite, promote the region brittle；And this martensitic traoformation, make the tissue of joint should
Power increases, in the rigid larger tubing of welding structure（Power pipe belongs to such）When, easily form cold crack.Therefore, use
When the mode such as traditional water cooling, air-cooled cools to tubing welding process, phenomena such as too low temperature, quenching, local quenching easily occurs,
The generation of weld defect can be promoted.
Document " development and application of austenitic stainless steel tubule welding bead heat sink "（《Welding technique》10th phase in 2012
Volume 41）The mode and frock of a kind of water-cooled cooling are described, effectively reduces the substrate temperature in welding process.But the party
Method there is also it is obvious the defects of：（1）The water jacket that this method uses is special tooling, poor universality, for the tubing of different size
Need to process various sizes of water jacket；（2）Frock need to be higher using the good copper material of thermal conductivity, cost；（3）Assembling is complicated, needs bullet
The servicing units such as spring and needs ensure to be close to tube wall；（4）Drop effect can only be obtained, is extremely difficult to the control to welding temperature,
The tubing of the needs such as P91, P92 preheating is difficult to be applicable；（5）It is only applicable to manual welding, all position welding or other welding objects
Fixed situation, the situation that tubing rotates in welding process is not suitable for it.
The content of the invention
The present invention is aiming above mentioned problem, there is provided a kind of welding efficiency is high, the tubing welding process of good heat dissipation effect dissipates
The method and frock of heat.
To achieve the above object, the present invention adopts the following technical scheme that, the frock bag of tubing welding process radiating of the present invention
Air guide wall arc and heat conducting film are included, its structural feature heat conducting film is wrapped in tubing weld seam both sides；It is provided with the air guide wall arc more
Individual gas guide nozzle；Each gas guide nozzle export direction is tilted and is directed away from the heat conducting film of the weld seam, in center condensed form；Air guide wall
Arc one end is provided with air inlet.
As a kind of preferred scheme, straight line where each gas guide nozzle export direction of the present invention intersects at the heat conducting film
Same point on longitudinal center line.
As another preferred scheme, air guide wall arc of the present invention is semicircle air guide wall arc.
As another preferred scheme, pressure regulator valve is provided with air inlet of the present invention.
As another preferred scheme, air guide wall arc of the present invention is two, corresponds to leading for tubing weld seam both sides respectively
Hotting mask is set.
As another preferred scheme, heat conducting film of the present invention is the graphite film, aluminium foil or copper foil that glue is covered in outer surface.
Secondly, heat conducting film of the present invention is 60~500mm close to the distance of weld seam one end and weld edge, heat conducting film
Length is more than or equal to 100mm；Plane where the air guide wall arc and heat conducting film it is axially vertical, each gas guide nozzle export direction is with leading
The axial direction of hotting mask is in 20~70 ° of angles；The air inlet is connected with 8mm flexible pipes.
In addition, the bottom of air guide wall arc of the present invention is arranged on the upper end of upper and lower telescope support.
The method of tubing welding process radiating of the present invention comprises the following steps.
1）Wrap up weld seam both sides respectively using heat conducting film.
2）The air stream for forming the wind-guiding mouth is concentrated on heat conducting film longitudinal center line, forms semicircle air flue, and
Backwards to weld seam, pipe both ends are flowed to from weld seam both sides respectively for air stream.
3）After welding starts, when interlayer temperature or substrate temperature reach desired value, the pressure regulator valve is opened, using compression
Air carries out air-cooled.
4）Compressed air require is adjusted, heat input and diffusion is reached balance, stable interlayer temperature or substrate temperature.
As a kind of preferred scheme, step 3 of the present invention）In desired value refer to 10 below technological requirement maximum temperature
~20 DEG C；The step 4）The pressure of the compressed air require is 0.15~0.6MPa.
Beneficial effect of the present invention.
（1）Operate and frock is simple, easy, applicability is good, a set of frock can meet the weldering of a variety of different size tubing
Connect demand.
（2）Lowering temperature uniform：Tubing is wrapped up using heat conducting film, ensure that heat radially using the characteristic of its high thermal conductivity coefficient
Uniformly diffusion, local quenching phenomenon caused by avoiding direct cold wind, also improve the heat exchanger effectiveness of whole radial direction.
（3）Welding heat diffuses to heat conducting film through pipe matrix, realizes and disappears in the heat exchange by heat conducting film and compressed air
Dissipate.
（4）Be not in stop arc caused by overheating problem in whole welding process, drastically increase welding efficiency, drop
Low welding cost.
Brief description of the drawings
The present invention will be further described with reference to the accompanying drawings and detailed description.The scope of the present invention not only limits to
In the statement of herein below.
Fig. 1 is schematic structural view of the invention.
Fig. 2 is the welding bead interlayer temperature versus time curve figure of the embodiment of the present invention one.
Fig. 3 is the welding bead interlayer temperature versus time curve figure of the embodiment of the present invention two.
In Fig. 1：1 it is telescoping shoring column, 2 be air inlet, 3 is pressure regulator valve（Or flowmeter）, 4 be air guide wall arc, 5 be air guide
Mouth, 6 be heat conducting film, 7 be welding bead, 8 be tubing.
Embodiment
As illustrated, the frock of tubing welding process radiating of the present invention includes air guide wall arc and heat conducting film, heat conducting film parcel
In tubing weld seam both sides；Multiple gas guide nozzles are provided with the air guide wall arc；Each gas guide nozzle export direction tilts and is directed away from institute
State on the heat conducting film of weld seam, in center condensed form；Air guide wall arc one end is provided with air inlet.
Straight line where each gas guide nozzle export direction intersects at the same point on the heat conducting film longitudinal center line.
The air guide wall arc is semicircle air guide wall arc.
Pressure regulator valve is provided with the air inlet.Heat exchange series can be efficiently controlled by adjusting compressed air require
Number, is easy to the control to welding temperature.
The air guide wall arc is two, and the heat conducting film for corresponding to tubing weld seam both sides respectively is set.
The heat conducting film is the graphite film, aluminium foil or copper foil that glue is covered in outer surface.
The heat conducting film is 60~500mm close to the distance of weld seam one end and weld edge, and the length of heat conducting film is more than etc.
In 100mm.Reserve 60~500mm distances, the convenient observing and controlling to matrix and interlayer temperature.
The bottom of the air guide wall arc is arranged on the upper end of upper and lower telescope support.
Axially vertical, the axial direction of each gas guide nozzle export direction and heat conducting film of plane and heat conducting film where the air guide wall arc
In 20~70 ° of angles.
The air inlet is connected with 8mm flexible pipes.
The method of tubing welding process radiating of the present invention comprises the following steps.
1）Wrap up weld seam both sides respectively using heat conducting film.
2）The air stream for forming the wind-guiding mouth is concentrated on heat conducting film longitudinal center line, forms semicircle air flue, and
Backwards to weld seam, pipe both ends are flowed to from weld seam both sides respectively for air stream.
3）After welding starts, when interlayer temperature or substrate temperature reach desired value, the pressure regulator valve is opened, using compression
Air carries out air-cooled.
4）Compressed air require is adjusted, heat input and diffusion is reached balance, stable interlayer temperature or substrate temperature.
The step 3）In desired value refer to below technological requirement maximum temperature 10~20 DEG C.
The step 4）The pressure of the compressed air require is 0.15~0.6MPa.
Embodiment one.
Proof scheme effect is carried out with 356 × 60mm/P91 of Φ straight tubes-straight tube welding.Welding manner is to use manual argon
Arc-welding bottoming 12mm, then filling and capping are completed using automatic submerged arc welding.Welding technique of submerged arc welding is：Using Φ 3.2mm welding wires,
200~300 DEG C, 370~430A of electric current, 28~32V of voltage of interlayer temperature, 400~500mm/min of speed.
Under conditions of being handled without cooling, automatic submerged-arc, which welds whole welding process, need to stop arc 4 times, stop arc every time certainly
So cooling 20min, 240min is needed to complete welding altogether.The present embodiment only carries out contrast verification to automatic submerged arc welding process.Using drop
Warm method carries out concretely comprising the following steps for automatic submerged arc welding weldering.
（1）Glue graphite guide hotting mask parcel welding bead both sides are covered using the outer surface of 0.15mm thickness, 150mm length before welding；Parcel
Scope：Away between 60~210mm of welding bead edge, wrap up one week.
（2）Ajust frock position：The compressed air stream of wind-guiding mouth is in axially 30 ° of angles with tubing；Concentrated with ring-type in air channel
Heat conducting film axial centre position is blowed to, i.e., at the radial outer wall away from welding bead edge 135mm.
（3）Welded according to welding process requirement, after starting automatic submerged arc welding 30min, interlayer temperature reaches 280 DEG C,
Open valve and carry out cooling processing.
（4）Pressure regulator valve is adjusted, compressed air is maintained at 0.3MPa.
（5）Continue to start capping after welding 120min, stop cooling.
（5）After only needing 15min, welding terminates.
Whole welding process need not stop arc cooling, and specific interlayer temperature change curve is as shown in Figure 2.With not using cooling
Method welding is compared, and saves time 75min, i.e. efficiency improves 31.25%.
Embodiment two.
With the difference of embodiment one.
（1）Identifying object is 375 × 57mm/P91 of Φ straight tubes-elbow welding.
（2）The compressed air stream of wind-guiding mouth and tubing axial direction are in 45 ° of angles.
（3）Glue aluminium foil parcel welding bead both sides are covered using the outer surface of 0.1mm thickness, 100mm length；Wrap up scope：Away from welding bead side
Between 60~160mm of edge, wrap up one week.
（4）Compressed air is maintained at 0.6MPa.
（5）After automatic submerged arc welding 40min, interlayer temperature reaches 295 DEG C, opens valve and carries out cooling processing；
（6）Whole welding process need not stop arc cooling, need 165min altogether, compared with being handled without cooling, save
60min, efficiency improve about 26.7%, and specific interlayer temperature change curve is as shown in Figure 3.
Embodiment three.
With the difference of embodiment one.
（1）Identifying object is 432 × 72mm/P91 of Φ straight tubes-elbow welding.
（2）The compressed air stream of wind-guiding mouth is in axially 60 ° of angles with tubing.
（3）Glue aluminium foil parcel welding bead both sides are covered using the outer surface of 0.1mm thickness, 100mm length；Wrap up scope：Away from welding bead side
Between 60~160mm of edge, wrap up one week.
（4）Compressed air is maintained at 0.4MPa.
（5）After automatic submerged arc welding 50min, interlayer temperature reaches 295 DEG C, opens valve and carries out cooling processing.
（6）Whole welding process need not stop arc cooling, need 255min altogether, compared with being handled without cooling, save
80min, efficiency improve 23.9%.
Example IV.
With the difference of embodiment one.
（1）Welding technique of submerged arc welding is：Using Φ 2.4mm welding wires, 200~300 DEG C, 320~350A of electric current of interlayer temperature,
28~32V of voltage, 340~400mm/min of speed.
（2）Identifying object is 449 × 100mm/P92 of Φ straight tubes-straight tube welding.
（3）The compressed air stream of wind-guiding mouth and tubing axial direction are in 50 ° of angles.
（4）Glue graphite film parcel welding bead both sides are covered using the outer surface of 0.15mm thickness, 300mm length；Wrap up scope：Away from welding bead
Between 60~360mm of edge, wrap up one week.
（5）Compressed air is maintained at 0.2MPa.
（6）After automatic submerged arc welding 60min, interlayer temperature reaches 270 DEG C, opens valve and carries out cooling processing.
（7）Whole welding process need not stop arc cooling, need 600min altogether, compared with being handled without cooling, save
90min, efficiency improve 13.04%.
It is understood that above with respect to the specific descriptions of the present invention, it is merely to illustrate the present invention and is not limited to this
Technical scheme described by inventive embodiments, it will be understood by those within the art that, still the present invention can be carried out
Modification or equivalent substitution, to reach identical technique effect；As long as meet use needs, all protection scope of the present invention it
It is interior.
Claims (4)
1. a kind of frock of tubing welding process radiating, including air guide wall arc and heat conducting film, it is characterised in that heat conducting film is wrapped in
Tubing weld seam both sides；Multiple gas guide nozzles are provided with the air guide wall arc；Each gas guide nozzle export direction inclination is directed away from described
On the heat conducting film of weld seam, in center condensed form；Air guide wall arc one end is provided with air inlet；
Straight line where each gas guide nozzle export direction intersects at the same point on the heat conducting film longitudinal center line；
The air guide wall arc is two, and the heat conducting film for corresponding to tubing weld seam both sides respectively is set；
The heat conducting film is 60~500mm close to the distance of weld seam one end and weld edge, and the length of heat conducting film is more than or equal to
100mm；Plane where the air guide wall arc and heat conducting film it is axially vertical, the axial direction of each gas guide nozzle export direction and heat conducting film is in
20~70 ° of angles；The air inlet is connected with 8mm flexible pipes；
The bottom of the air guide wall arc is arranged on the upper end of upper and lower telescope support；
Pressure regulator valve is provided with the air inlet.
2. a kind of frock of tubing welding process radiating according to claim 1, it is characterised in that the air guide wall arc is half
Circular air guide wall arc.
3. a kind of frock of tubing welding process radiating according to claim 1, it is characterised in that the heat conducting film is appearance
Cover the graphite film, aluminium foil or copper foil of glue in face.
4. claims 1 to 3 it is any as described in a kind of heat dissipating method of frock that radiates of tubing welding process, it is characterised in that
Comprise the following steps：
1）Wrap up weld seam both sides respectively using heat conducting film；
2）The air stream for forming the gas guide nozzle is concentrated on heat conducting film longitudinal center line, forms semicircle air flue, and air
Backwards to weld seam, pipe both ends are flowed to from weld seam both sides respectively for stream；
3）After welding starts, when interlayer temperature or substrate temperature reach desired value, the pressure regulator valve is opened, using compressed air
Carry out air-cooled；
4）Compressed air require is adjusted, heat input and diffusion is reached balance, stable interlayer temperature or substrate temperature；
The step 3）In desired value refer to below technological requirement maximum temperature 10~20 DEG C；The step 4）The compression is empty
The pressure of throughput is 0.15~0.6MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511012985.0A CN105414727B (en) | 2015-12-31 | 2015-12-31 | A kind of method and frock of the radiating of tubing welding process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511012985.0A CN105414727B (en) | 2015-12-31 | 2015-12-31 | A kind of method and frock of the radiating of tubing welding process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105414727A CN105414727A (en) | 2016-03-23 |
| CN105414727B true CN105414727B (en) | 2018-02-16 |
Family
ID=55493504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511012985.0A Active CN105414727B (en) | 2015-12-31 | 2015-12-31 | A kind of method and frock of the radiating of tubing welding process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105414727B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112496624A (en) * | 2019-12-17 | 2021-03-16 | 陶志东 | Tool for welding rigid structural part with self-adaptive compensation of thermal stress |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010029931A (en) * | 2008-07-31 | 2010-02-12 | Jfe Steel Corp | Multi-electrode submerged arc welding method |
| CN201471099U (en) * | 2009-08-24 | 2010-05-19 | 中国石化集团第十建设公司 | Welding protective cover for titanium pipeline of argon-shielded tungsten arc welding gun |
| CN202498295U (en) * | 2012-02-24 | 2012-10-24 | 佛山市澜石宇航星不锈钢有限公司 | Local gas protection dragging cover used in titanium alloy welding |
| CN203437799U (en) * | 2013-09-17 | 2014-02-19 | 安徽三兴检测有限公司 | Protection device for field welding of zirconium pipe |
| CN203495442U (en) * | 2013-09-27 | 2014-03-26 | 宣浩 | Cooling device for welding equipment |
| CN204545684U (en) * | 2015-04-28 | 2015-08-12 | 中国化学工程第十一建设有限公司 | A kind of major diameter, thick-walled titanium tube weld joint protective device |
| CN204747740U (en) * | 2015-06-03 | 2015-11-11 | 朱立新 | Welding secondary safety cover |
| CN205324957U (en) * | 2015-12-31 | 2016-06-22 | 沈阳东管电力科技集团股份有限公司 | Radiating frock of tubular product welding process |
-
2015
- 2015-12-31 CN CN201511012985.0A patent/CN105414727B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010029931A (en) * | 2008-07-31 | 2010-02-12 | Jfe Steel Corp | Multi-electrode submerged arc welding method |
| CN201471099U (en) * | 2009-08-24 | 2010-05-19 | 中国石化集团第十建设公司 | Welding protective cover for titanium pipeline of argon-shielded tungsten arc welding gun |
| CN202498295U (en) * | 2012-02-24 | 2012-10-24 | 佛山市澜石宇航星不锈钢有限公司 | Local gas protection dragging cover used in titanium alloy welding |
| CN203437799U (en) * | 2013-09-17 | 2014-02-19 | 安徽三兴检测有限公司 | Protection device for field welding of zirconium pipe |
| CN203495442U (en) * | 2013-09-27 | 2014-03-26 | 宣浩 | Cooling device for welding equipment |
| CN204545684U (en) * | 2015-04-28 | 2015-08-12 | 中国化学工程第十一建设有限公司 | A kind of major diameter, thick-walled titanium tube weld joint protective device |
| CN204747740U (en) * | 2015-06-03 | 2015-11-11 | 朱立新 | Welding secondary safety cover |
| CN205324957U (en) * | 2015-12-31 | 2016-06-22 | 沈阳东管电力科技集团股份有限公司 | Radiating frock of tubular product welding process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105414727A (en) | 2016-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102554509B (en) | Vacuum brazing solder and process of Mo-Cu alloy and stainless steel | |
| CN1748925A (en) | Water cooling jacket for titanium alloy tube ring seam by tungsten argon arc welding and seam following cooling welding method | |
| CN102773581A (en) | Welding process of pearlite heat-resistant steel and ordinary carbon steel | |
| CN111558769B (en) | Automatic welding protection device for straight seam of titanium welded pipe and using method thereof | |
| CN205324957U (en) | Radiating frock of tubular product welding process | |
| CN202667850U (en) | Efficient copper and iron automatic flame soldering machine | |
| CN105414727B (en) | A kind of method and frock of the radiating of tubing welding process | |
| CN103223547A (en) | Dual-hot wire system and welding method for aluminum/steel dissimilar metal TIG (Tungsten Inert Gas) arc fused braze welding | |
| CN101318245A (en) | Tube fin brazing process and internal tube heating soldering machine for | |
| CN103433631A (en) | Nickel-base brazing process of heating tube | |
| CN101670383A (en) | Method for manufacturing inner covered stainless steel compound steel pipe | |
| CN107877874A (en) | A kind of heat radiating type ceramic honeycomb panel heat welded device | |
| CN106270872A (en) | A kind of vacuum induction composite brazing method | |
| CN105200269A (en) | Interlayer alloy as well as preparation method and application method thereof | |
| CN103307788B (en) | Solar heat collecting pipe venting equipment without tail pipe | |
| CN102319936B (en) | Welding plant for copper-aluminum composite tube heat exchangers | |
| CN202943362U (en) | Laser welding device with protection component | |
| CN203018871U (en) | High frequency soldering device of aero-engine guide pipe assembly | |
| CN205927451U (en) | Coaxial hollow tungsten utmost point heater TIG welder and welding set | |
| CN113385766B (en) | High-temperature induction brazing device for ceramic matrix composite and carbon/carbon composite | |
| CN105014173A (en) | Aluminum alloy vacuum brazing method capable of reducing corrosion | |
| CN104162737B (en) | The vacuum diffusion welding process of vacuum freeze dryer plate layer | |
| CN203696216U (en) | Arc welding deformation resistance device for tubular parts | |
| CN207402234U (en) | A kind of vacuum brazing furnace that workpiece excess calories is prevented to scatter and disappear | |
| CN206293225U (en) | Water-cooled resistor and its mounting assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yu Yang Inventor after: Zhang Sheng Inventor after: Liu Gang Inventor after: Miao Weicheng Inventor after: Liu Baokun Inventor after: Feng Yinfeng Inventor before: Liu Gang Inventor before: Yu Yang Inventor before: Zhang Sheng Inventor before: Wang Xiaohui Inventor before: Miao Weicheng Inventor before: Li Zhifu |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |