CN110560828A - Soldering flux layered welding pen - Google Patents
Soldering flux layered welding pen Download PDFInfo
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- CN110560828A CN110560828A CN201910816814.5A CN201910816814A CN110560828A CN 110560828 A CN110560828 A CN 110560828A CN 201910816814 A CN201910816814 A CN 201910816814A CN 110560828 A CN110560828 A CN 110560828A
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- tube
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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
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/08—Auxiliary devices therefor
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention provides a welding flux layered welding pen, which comprises a medicine tube, a clamping end and a pen container, wherein the clamping end and the pen container are connected to one end of the medicine tube, and the welding flux layered welding pen is characterized in that: the explosive tube is filled with welding flux, the end head at the bottom of the explosive tube is provided with an ignition head, an ignition section is arranged between the ignition head and the welding flux in the explosive tube, the top of the explosive tube is sealed by a clamping end, the inside of the explosive tube is of a double-layer tube structure and is respectively an inner-layer explosive tube and an outer-layer explosive tube, the inner-layer explosive tube is filled with slagging agent and synthetic agent, and the outer-layer explosive tube is filled with high-heat agent and a small amount of welding flux material in the inner-layer explosive tube. The invention adopts a welding flux layered type medicine tube structure to separate the slagging agent, the alloying agent and the high-heat agent, so that the reaction is stable and reliable; meanwhile, a small amount of slag former and alloying agent are added into the outer-layer medicine tube mainly containing high-heat agent, so that continuous aluminothermic reaction is ensured; the slag former is mainly concentrated in the inner-layer explosive tube, so that the absorption of reaction heat is reduced, and a better protection effect on a molten pool is achieved; the alloying agent is concentrated in the inner layer of the explosive tube, so that the trace alloying components in the welding line can be adjusted more conveniently.
Description
Technical Field
the invention belongs to the technical field of welding, relates to a welding pen, and particularly relates to a welding flux layered welding pen suitable for welding metal materials such as steel, copper and the like.
Background
The welding technology is one of the important means for manufacturing, rush-repair and emergency maintenance and installation of industrial, civil and military equipment, but the currently widely adopted shielded metal arc welding needs a power supply capable of outputting more than kilowatt power and a heavy electric welding machine, the gas welding needs high-voltage special equipment for storing oxygen and acetylene gas, the involving engineering is large, and an operator needs special training. This greatly limits the flexible, flexible and efficient expansion of emergency repair and welding tasks under special conditions such as power failure, field, rain and snow weather. In addition, under the extreme conditions of inconvenient energy supply such as high altitude, underground, underwater and the like, the traditional emergency maintenance methods cannot be applied. Meanwhile, in the emergency maintenance of water-gas pipelines, heating pipe networks and engineering cables, a convenient emergency welding method is urgently needed for rapidly recovering in situ or partially recovering the use function; in the emergency rescue and the fire relief of earthquake, fire and the like and the fire breaking and dismantling, a cutting tool which does not need external energy and equipment and is convenient to use is urgently needed. Therefore, it is necessary to develop a new welding technique and welding material that do not require a large amount of external energy and large-scale equipment, are easy to use, and are efficient and energy-saving to overcome the shortcomings of the conventional welding technique.
In order to meet the welding requirements, a manual thermite welding rod is provided in patent 200810227057.X, an electroless welding rod is provided in patent 201210391069.2, a portable welding pen is provided in patent 201110126018.2, a simple electroless welding pen is provided in patent 201210159201.7, and a self-igniting portable welding pen is provided in patent 201521118973.1. The flux contains high-heat agent, slag former and alloying agent, etc. and is filled into the medicine tube after mechanical mixing. During reaction, the slag former mixed in the flux can increase the intensity of the reaction, absorb a large amount of heat and reduce the heat input of welding; meanwhile, the slag former with less content is dispersed in the high-heat agent, and the protection effect is weakened. Therefore, it is necessary to design a soldering flux layered soldering pen with high efficiency, stable and reliable reaction and good protection effect.
Disclosure of Invention
Aiming at the problems in the prior art, the technical scheme adopted by the invention for solving the problems in the prior art is as follows:
The utility model provides a welding flux layer-stepping welding pen, includes the pencil, connects in the exposed core and the pen container of pencil one end, its characterized in that: the explosive tube is filled with welding flux, the end head at the bottom of the explosive tube is provided with an ignition head, an ignition section is arranged between the ignition head and the welding flux in the explosive tube, the top of the explosive tube is sealed by a clamping end, the inside of the explosive tube is of a double-layer tube structure and is respectively an inner-layer explosive tube and an outer-layer explosive tube, the inner-layer explosive tube is filled with slagging agent and synthetic agent, and the outer-layer explosive tube is filled with high-heat agent and a small amount of welding flux material in the inner-layer explosive tube.
The slag former and the synthetic agent filled in the inner layer medicine tube comprise the following components: CaF220-50 wt.% of powder, CaSO425-50 wt.% of powder, 5-20 wt.% of borax, 5-20 wt.% of ferromanganese powder and 10-30 wt.% of ferronickel powder.
the Mn content in the ferromanganese powder is 88 wt.%, the Fe content is 10 wt.%, and the balance is impurities; the content of Ni in the ferronickel powder is 55 wt.%, the content of Fe is 43 wt.%, and the balance is impurities
88-90 wt.% of thermite and 10-12 wt.% of flux material in the inner-layer medicine tube are filled in the outer-layer medicine tube, and the thermite comprises 75-85 wt.% of CuO powder and 15-25 wt.% of Al powder.
The CuO powder is industrial copper scraps, and the oxidation rate is 70-80%.
The granularity of all the raw materials is 150-200 meshes.
The inner layer medicine tube is made of an aluminum tube or a paper tube, and the outer layer medicine tube is made of a paper tube.
the diameter of the inner layer medicine tube is 20-40% of that of the outer layer medicine tube.
the bottom of the clamping end is provided with a bulge which is matched and connected with and fixed with the opening at the upper end of the medicine tube, and the top of the clamping end is provided with an external thread section which is matched and connected with the internal thread of the end head of the pen container.
The pen container is made of PVC pipes, the diameter of the pen container is 1-2 mm larger than that of the outer-layer medicine pipe, the length of the pen container is 4-5 mm longer than that of the outer-layer medicine pipe, one end of the pen container is provided with internal threads matched with the external threads of the clamping end, and the pen container is sleeved outside the medicine pipe when the welding pens are not used; when the welding pen is used, the pen container is pulled out, and the pen container can be simply and quickly matched with the external thread of the clamping end at the tail part of the medicine tube through the internal thread on the pen container, so that the welding pen can be fixed and supported.
The ignition head is composed of red phosphorus, and the ignition section adopts thermite welding ignition powder.
The preparation process of the welding flux layered welding pen comprises the following steps: (1) drying the raw materials in an electric heating constant-temperature air blast drying box (T ═ 80 ℃) for 6-8 hours; (2) weighing raw materials according to the mass percent of the slag former and the alloying agent, and mixing in a high-speed mixer to prepare the inner-layer flux of the medicine tube; (3) weighing the inner-layer flux and the high-heat agent according to the mass percentage, and mixing in a high-speed mixer to prepare the outer-layer flux; (4) filling the inner-layer flux into a paper or aluminum flux tube with the diameter of 3-6 mm and the length of 200-250 mm; (5) sleeving a paper medicine tube with the diameter of 10-15 mm and the length of 200-250 mm outside the inner-layer medicine tube, and filling outer-layer medicine tube welding flux between the inner-layer medicine tube and the outer-layer medicine tube; (6) one end of the explosive tube is provided with an ignition section and an ignition head, and the other end is provided with a clamping end seal; (7) and (3) putting the medicine tube into a pen container with the diameter 1-2 mm larger than that of the outer medicine tube and the length 4-5 mm longer than that of the outer medicine tube, and welding pens to obtain the medicine tube.
The ignition mode of the welding pen is three-stage ignition: the ignition head is ignited by match or lighter, the ignition head ignites the ignition section after burning, and the welding flux is ignited by the ignition section. The reason is that the thermite reaction of the welding flux needs higher temperature, the thermite reaction can not be initiated by the temperature generated by the burning of common gunpowder, and the welding flux can be ignited only by adopting a special commercial thermite welding ignition section. The special thermite welding ignition section cannot be ignited by matches or lighters, only a spray gun with higher flame combustion temperature can be adopted, but the spray gun is inconvenient to carry. So that it designs a red phosphorus ignition head whose composition is identical to that of general match head. The adhesive is added into the medicament of the ignition head and the ignition section of the ignition section, and the mixture is pressed into blocks, so that the assembly is convenient.
The using method of the welding pen comprises the steps of extracting the explosive tube from the pen container, screwing the pen container on the clamping end, holding the pen container by hands, aligning the welding pen to a workpiece part to be welded, igniting an ignition head by a match or a lighter, and generating a large amount of heat by the aluminothermic reaction of the flux of the explosive tube at the outer layer of the ignition section after 2-3 seconds; the flux of the inner layer of the flux tube mainly plays roles of slagging protection and weld joint alloying. During welding, the welding direction adopts backward tilting, the welding inclination angle is about 70 degrees, the flame length (the distance between a combustion point at the front end of a welding pen and the surface of a base metal) is controlled to be about 5mm, the welding speed is 7-9 mm/s, the huge heat emitted by the combustion of a welding rod is used as a welding heat source, the generated alloy is used as deposited metal, and the welding between workpieces is completed.
The invention has the following advantages:
(1) The welding flux is simple in composition and is common industrial raw materials, and the inner and outer layer cartridge cases, the pen tube, the clamping end, the ignition head and the ignition section of the welding pen are all made of common materials, so that the welding pen is low in price;
(2) the pen container plays a role in isolating and protecting the medicine tube during storage, and is used as an extension holding part of the medicine tube during use, so that the convenience and the safety of operation are improved;
(3) A flux layered type medicine tube structure is adopted, a slagging agent, an alloying agent and a thermite are separated, so that the reaction is stable and reliable, and a small amount of the slagging agent and the alloying agent are added into an outer-layer medicine tube mainly containing the thermite, so that the continuous aluminothermic reaction is ensured;
(4) The slag former is mainly concentrated in the inner-layer explosive tube, so that the absorption of reaction heat is reduced, the welding heat input is improved, and a better protection effect on a molten pool is achieved;
(5) The alloying agent is concentrated in the inner layer powder tube, so that trace alloying components in the welding line can be adjusted conveniently;
(6) The portable design can be used for cutting operations in an electroless condition.
Drawings
FIG. 1 is a schematic view of a soldering pen according to the present invention;
FIG. 2 is a schematic structural view of a cartridge, a clamping end and a pen container;
Reference numbers in the figures: 1-inner layer medicine tube; 2-inner layer flux; 3-outer layer medicine tube; 4-outer layer flux; 5-an ignition head; 6-a pilot section; 7-a clamping end; 8-pen container.
Detailed Description
The technical scheme of the invention is further described in detail by the following embodiments and the accompanying drawings, as shown in fig. 1-2, a welding flux layered welding pen comprises an inner layer medicine tube 1 filled with inner layer welding flux 2; an outer-layer medicine tube 3 is sleeved outside the inner-layer medicine tube 1, and outer-layer welding flux 4 is filled between the inner-layer medicine tube and the outer-layer medicine tube; one end of the medicine tube is provided with an ignition head 5, and an ignition section 6 is arranged between the ignition head 5 and the welding flux; the other end of the medicine tube is sealed by a clamping end 7, and the clamping end 7 is provided with an external thread; one end of the pen container 8 is provided with an internal thread which is matched with the external thread on the clamping end 7. The inner layer medicine tube 1 is made of an aluminum tube or a paper tube, the outer layer medicine tube 3 is made of a paper tube, and the diameter of the inner layer medicine tube 1 is 20-40% of that of the outer layer medicine tube 3; the inner layer welding flux 2 is a slagging agent and an alloying agent and comprises the following components: CaF220-50 wt.% of powder, CaSO425-50 wt.% of powder, 5-20 wt.% of borax, 5-20 wt.% of ferromanganese powder and 10-30 wt.% of ferronickel powder; the outer layer welding flux 4 comprises 88-90 wt.% of high-heat agent and 10-12 wt.% of inner layer welding flux 2, and the high-heat agent comprises 75-85 wt.% of CuO powder and 15-25 wt.% of Al powder. The pen container 8 is made of PVC pipes, the diameter of the pen container is 1-2 mm larger than that of the outer medicine pipe 3, and the length of the pen container is 4-5 mm longer than that of the outer medicine pipe 3. The pen container can play a role in protecting the paper explosive tubes with lower strength when the welding pens are stored, and can simply and quickly match with the external threads of the tail clamping ends of the explosive tubes through the internal threads on the pen container when the welding pens are used, so that the pen container can play a role in fixing and supporting the welding pens, and the pen container can be liftedHigh convenience and safety of operation.
The invention adopts a welding flux layered type medicine tube structure to separate a slagging agent, an alloying agent and a high-heat agent, so that the reaction is stable and reliable. Meanwhile, a small amount of slag former and alloying agent are added into the outer-layer medicine tube mainly containing high-heat agent, so that continuous aluminothermic reaction is ensured; the slag former is mainly concentrated in the inner-layer explosive tube, so that the absorption of reaction heat is reduced, the welding heat input is improved, and a better protection effect on a molten pool is achieved; the alloying agent is concentrated in the inner layer of the explosive tube, so that the trace alloying components in the welding line can be adjusted more conveniently.
The invention is described below with reference to the figures and examples.
Example 1:
a layered welding pen with welding flux is composed of internal layer consisting of slag former and alloy, and external layer consisting of high-heat agent and less internal layer. The inner layer flux comprises the following components: CaF240 wt.% flour, CaSO420 wt.% of powder, 5 wt.% of borax, 15 wt.% of ferromanganese powder and 20 wt.% of ferronickel powder; the components of the outer layer flux are 90 wt.% of thermite and 10 wt.% of inner layer flux, wherein the components of the thermite are 75 wt.% of CuO powder and 25 wt.% of Al powder. Drying the raw materials in an electric heating constant-temperature air-blast drying box (T ═ 80 ℃) for 6 hours; weighing the raw materials according to the mass percentage, mixing in a high-speed mixer, and sequentially preparing an inner layer welding flux and an outer layer welding flux; filling the inner layer welding flux into a paper medicine tube with the diameter of 5mm and the length of 200mm, sleeving the paper medicine tube with the diameter of 12mm and the length of 200mm outside the inner layer medicine tube, and filling the outer layer welding flux between the inner layer medicine tube and the outer layer medicine tube; one end of the explosive tube is provided with an ignition section and an ignition head, and the other end is provided with a clamping end seal; the medicine tube is put into a pen container made of PVC tube with the diameter of 13.5mm and the length of 205mm, and the pen is welded.
Carrying out flat surfacing on two Q235 steel plates with the specification of 100mm multiplied by 40mm multiplied by 5mm, drawing out the medicine tube from the pen container, screwing the pen container on the clamping end, holding the pen container by hands, aligning the welding pen to the part of the workpiece to be welded, igniting the ignition head by using a match, and after 2 seconds, igniting the aluminothermic reaction of the welding flux in the medicine tube by the ignition section. During welding, the welding direction adopts backward tilting, the welding inclination angle is about 70 degrees, the flame length of a welding rod is controlled to be about 5mm, and the welding speed is 7 mm/s. The reaction process is stable and controllable, the welding slag on the surface is removed after the welding is finished, the welding seam is well formed, and the protection effect is good.
Example 2:
a layered welding pen with welding flux is composed of internal layer consisting of slag former and alloy, and external layer consisting of high-heat agent and less internal layer. The inner layer flux comprises the following components: CaF225 wt.% flour, CaSO430 wt.% of powder, 10 wt.% of borax, 15 wt.% of ferromanganese powder and 20 wt.% of ferronickel powder; the components of the outer layer flux are 88 wt.% of thermite and 12 wt.% of inner layer flux, wherein the components of the thermite are 80 wt.% of CuO powder and 20 wt.% of Al powder. The granularity of each raw material is 150-200 meshes. Drying the raw materials in an electric heating constant-temperature air-blast drying box (T ═ 80 ℃) for 8 hours; weighing the raw materials according to the mass percentage, mixing in a high-speed mixer, and sequentially preparing an inner layer welding flux and an outer layer welding flux; filling the inner layer welding flux into a paper medicine tube with the diameter of 4mm and the length of 220mm, sleeving the paper medicine tube with the diameter of 11mm and the length of 220mm outside the inner layer medicine tube, and filling the outer layer welding flux between the inner layer medicine tube and the outer layer medicine tube; one end of the explosive tube is provided with an ignition section and an ignition head, and the other end is provided with a clamping end seal; the medicine tube is put into a pen container made of PVC tube with the diameter of 13mm and the length of 225mm, and the pen is welded.
Carrying out flat surfacing on two copper plates with the specification of 100mm multiplied by 40mm multiplied by 5mm, drawing out the explosive tube from a pen container, screwing the pen container on a clamping end, holding the pen container by hands, aligning a welding pen at the position of a workpiece to be welded, igniting an ignition head by using a match, and after 2 seconds, initiating aluminothermic reaction of welding flux in the explosive tube by an ignition section. During welding, the welding direction adopts backward tilting, the welding inclination angle is about 70 degrees, the flame length of a welding rod is controlled to be about 5mm, and the welding speed is 7 mm/s. The reaction process is stable and controllable, the welding slag on the surface is removed after the welding is finished, the welding seam is well formed, and the protection effect is good.
The protective scope of the present invention is not limited to the above-described embodiments, and it is apparent that various modifications and variations can be made to the present invention by those skilled in the art without departing from the scope and spirit of the present invention. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (10)
1. The utility model provides a welding flux layer-stepping welding pen, includes the pencil, connects in the exposed core and the pen container of pencil one end, its characterized in that: the explosive tube is filled with welding flux, the end head at the bottom of the explosive tube is provided with an ignition head, an ignition section is arranged between the ignition head and the welding flux in the explosive tube, the top of the explosive tube is sealed by a clamping end, the inside of the explosive tube is of a double-layer tube structure and is respectively an inner-layer explosive tube and an outer-layer explosive tube, the inner-layer explosive tube is filled with slagging agent and synthetic agent, and the outer-layer explosive tube is filled with high-heat agent and a small amount of welding flux material in the inner-layer explosive tube.
2. the flux cored welding pen of claim 1, wherein: the slag former and the synthetic agent filled in the inner layer medicine tube comprise the following components: CaF220-50 wt.% of powder, CaSO425-50 wt.% of powder, 5-20 wt.% of borax, 5-20 wt.% of ferromanganese powder and 10-30 wt.% of ferronickel powder.
3. The flux cored welding pen of claim 2, wherein: the Mn content in the ferromanganese powder is 88 wt.%, the Fe content is 10 wt.%, and the balance is impurities; the content of Ni in the ferronickel powder was 55 wt.%, the content of Fe was 43 wt.%, and the balance was impurities.
4. The flux cored welding pen of claim 1, wherein: 88-90 wt.% of thermite and 10-12 wt.% of flux material in the inner-layer medicine tube are filled in the outer-layer medicine tube, and the thermite comprises 75-85 wt.% of CuO powder and 15-25 wt.% of Al powder.
5. The flux cored welding pen of claim 4, wherein: the CuO powder is industrial copper scraps, and the oxidation rate is 70-80%.
6. The flux cored welding pen of claim 1, wherein: the inner layer medicine tube is made of an aluminum tube or a paper tube, and the outer layer medicine tube is made of a paper tube.
7. The flux cored welding pen of claim 1, wherein: the diameter of the inner layer medicine tube is 20-40% of that of the outer layer medicine tube.
8. The flux cored welding pen of claim 1, wherein: the bottom of the clamping end is provided with a bulge which is matched and connected with and fixed with the opening at the upper end of the medicine tube, and the top of the clamping end is provided with an external thread section which is matched and connected with the internal thread of the end head of the pen container.
9. The flux cored welding pen of claim 1, wherein: the pen container is made of PVC pipes, the diameter of the pen container is 1-2 mm larger than that of the outer-layer medicine pipe, the length of the pen container is 4-5 mm longer than that of the outer-layer medicine pipe, one end of the pen container is provided with internal threads matched with the external threads of the clamping end, and the pen container is sleeved outside the medicine pipe when the welding pens are not used; when in use, the pen container is drawn out and is simply and quickly matched with the external thread of the clamping end at the tail part of the medicine tube through the internal thread on the pen container.
10. The flux cored welding pen of claim 1, wherein: the ignition head is composed of red phosphorus, and the ignition section adopts thermite welding ignition powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910816814.5A CN110560828B (en) | 2019-08-30 | 2019-08-30 | Soldering flux layered welding pen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910816814.5A CN110560828B (en) | 2019-08-30 | 2019-08-30 | Soldering flux layered welding pen |
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| CN110560828A true CN110560828A (en) | 2019-12-13 |
| CN110560828B CN110560828B (en) | 2021-07-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114012319A (en) * | 2021-11-19 | 2022-02-08 | 中国人民解放军陆军工程大学 | Welding pen |
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| JPS63180397A (en) * | 1987-01-23 | 1988-07-25 | Mamoru Kodama | Thermit type welding rod |
| CN2675322Y (en) * | 2004-02-03 | 2005-02-02 | 四川石油管理局成都总机械厂 | Double tube alloy surfacing electrode |
| CN102151982A (en) * | 2011-05-17 | 2011-08-17 | 武汉大学 | Portable welding pen |
| CN202037396U (en) * | 2010-12-06 | 2011-11-16 | 武汉大学 | High-energy cutting pen |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0162427A1 (en) * | 1984-05-23 | 1985-11-27 | Brower, Jerome S. | Improved thermal burning rod |
| JPS63180397A (en) * | 1987-01-23 | 1988-07-25 | Mamoru Kodama | Thermit type welding rod |
| CN2675322Y (en) * | 2004-02-03 | 2005-02-02 | 四川石油管理局成都总机械厂 | Double tube alloy surfacing electrode |
| CN202037396U (en) * | 2010-12-06 | 2011-11-16 | 武汉大学 | High-energy cutting pen |
| CN102151982A (en) * | 2011-05-17 | 2011-08-17 | 武汉大学 | Portable welding pen |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114012319A (en) * | 2021-11-19 | 2022-02-08 | 中国人民解放军陆军工程大学 | Welding pen |
| CN114012319B (en) * | 2021-11-19 | 2024-05-10 | 中国人民解放军陆军工程大学 | Welding pen |
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| CN110560828B (en) | 2021-07-02 |
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Effective date of registration: 20221010 Address after: 433128, Hubei City, Qianjiang Province Yu Yu Town Road, No. 6 Patentee after: QIANJIANG CITY JIANGHAN DRILLING CO.,LTD. Address before: 430072 Hubei Province, Wuhan city Wuchang District of Wuhan University Luojiashan Patentee before: WUHAN University |
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