CN112719541B - Protective gas nozzle for electric arc welding and cleaning method thereof - Google Patents
Protective gas nozzle for electric arc welding and cleaning method thereof Download PDFInfo
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- CN112719541B CN112719541B CN202011541293.6A CN202011541293A CN112719541B CN 112719541 B CN112719541 B CN 112719541B CN 202011541293 A CN202011541293 A CN 202011541293A CN 112719541 B CN112719541 B CN 112719541B
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- blade
- scraper
- arc welding
- scraping
- gas nozzle
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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
- B23K9/32—Accessories
- B23K9/325—Devices for supplying or evacuating shielding gas
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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
- B23K9/32—Accessories
- B23K9/328—Cleaning of weld torches, i.e. removing weld-spatter; Preventing weld-spatter, e.g. applying anti-adhesives
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to the technical field of electric arc additive, in particular to a protective gas nozzle for electric arc welding and a cleaning method thereof, wherein the protective gas nozzle comprises the following steps: the protective cover body is arranged at the periphery of the contact tube, has an opening end in the wire feeding direction of the contact tube, and is provided with a rotary inner wall surface at the part close to the contact tube, and a channel for accommodating airflow to pass is formed between the inner wall surface and the contact tube; the scraper is arranged in the channel and can be driven to rotate by taking the contact tip as an axis; the scraper comprises a first blade attached to the inner wall surface of the protective cover body; the invention utilizes the driving device to drive the scraper to rotate on the inner wall of the protection air nozzle, so that splashes on the inner wall of the protection air nozzle and the bottom of the conductive head can be removed in real time, the blades of the rotary scraper rotate to ensure that the metal blown into a molten pool is more concentrated, the luster and the forming of a weld bead are more effectively protected, and the condition of uneven flow of the protection gas after the splashes are attached to the inner wall of the protection air nozzle is also prevented.
Description
Technical Field
The invention relates to the technical field of electric arc additive, in particular to a protective gas nozzle for electric arc welding and a cleaning method thereof.
Background
In the electric arc additive manufacturing (WAAM), an electric arc is used as a heat source, a welding wire is used as an additive material, each layer of layers is stacked according to a set forming path, and a required solid three-dimensional model is formed in a layer-by-layer stacking mode. The metal complex geometric component with high density and good mechanical property is quickly formed, the production period of the product is shortened, and the utilization rate and the production efficiency of the material are greatly improved.
The purpose of protecting the gas nozzle is to flow inert gas to a molten pool at a high speed at a high temperature and a certain gas pressure, so that molten metal is cooled and solidified under the protection of the inert gas, and a good protection effect is achieved. And ordinary protection air cock protection effect is relatively poor, meets moreover that welding or printing splashes and can paste and pay in protection air cock inner wall, influences protection gas flow, needs to dismantle the clearance, extravagant plenty of time, and to the longer welding of large-scale printing piece welding seam need pause midway, can influence print with welding effect and machining efficiency.
In the prior art, a detachable material layer is arranged on the inner wall or a nozzle is arranged to be a material section which can be carbonized and consumed, but the two modes still need to be stopped and replaced after the material is consumed, impurities can fall off in welding, and the welding quality is affected.
Prior art documents:
patent document 1: CN100519038C gas nozzle for arc welding
Patent document 2: CN101745728B self-cleaning protection air nozzle
Disclosure of Invention
The invention aims to provide a protective gas nozzle for arc welding and a cleaning method thereof, which can scrape splashes adhered to the inner wall of a nozzle and the bottom of a conductive nozzle in real time in the welding process, keep the gas supply amount of protective gas stable and uniform, and prevent the conductive nozzle from being blocked.
In order to achieve the above object, the present invention provides a protective gas nozzle for arc welding, comprising:
the protective cover body is arranged at the periphery of the contact tube, has an opening end in the wire feeding direction of the contact tube, and is provided with a rotary inner wall surface at the part close to the contact tube, and a channel for accommodating airflow to pass is formed between the inner wall surface and the contact tube;
the scraper is arranged in the channel and can be driven to rotate by taking the contact tip as an axis;
the scraper comprises a first blade attached to the inner wall surface of the protection cover body and used for scraping off adhesive substances adhered to the inner wall surface of the protection cover body, and the scraper comprises a second blade located on the periphery of the wire feeding port of the conductive nozzle and used for scraping off the adhesive substances adhered to the conductive nozzle.
Preferably, the first blade of the scraper has a first scraping surface attached to an inner wall surface at a predetermined length from the open end of the protective cover body for scraping off an adhered matter on the inner wall surface within a predetermined length from the open end.
Preferably, the first blade is provided with a current collecting surface located in the channel, the current collecting surface is parallel to the axis of the contact nozzle, and the current collecting surface comprises an arc surface capable of collecting airflow in the direction close to the axis.
Preferably, the second blade has a second scraping surface which is matched with the bottom contour of the contact tube and is used for scraping off the adhered matters adhered to the bottom of the contact tube.
Preferably, the second blade is fixed on the first blade, and the first blade is provided with a connecting part for connecting a driving device for driving the first blade to rotate.
Preferably, the doctor blade further includes a connecting portion connecting the first blade and the second blade, the connecting portion being configured in a ring shape.
Preferably, the wire feeding device further comprises a driving device, wherein the connecting part extends towards the wire feeding direction and is connected to an output end of the driving device for driving the scraper to rotate.
Preferably, the drive means comprises an annular motor.
The invention provides another technical scheme, and the method for cleaning the protection gas nozzle for the arc welding comprises the following steps: and controlling a driving device to adjust the scraper to rotate at different rotating speeds according to different splashing amounts corresponding to different welding wire materials so as to scrape the adhered matters on the inner wall of the protective cover body and the bottom of the contact tube.
The invention provides another technical scheme, and an arc welding device comprises the protective gas nozzle for arc welding in the scheme.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the presently disclosed subject matter.
The foregoing and other aspects, embodiments and features of the present teachings will be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic view of a protective nozzle for arc welding according to the present invention;
FIG. 2 is a schematic view of one of the structures of the doctor blade in the embodiment of the present invention;
FIG. 3 is another schematic view of the construction of a doctor blade in an embodiment of the invention;
FIG. 4 is a schematic view of another embodiment of a doctor blade according to the present invention;
figure 5 is a top view of the scraper blade of the embodiment of figure 4 of the present invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways for a protective gas nozzle for arc welding and a method of cleaning the same, as the disclosed concepts and embodiments are not limited to any embodiment. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
Gas metal arc welding is classified into Metal Inert Gas (MIG) welding and non-metal inert gas (TIG) welding, and the gas nozzle of the present invention is suitable for welding such as MIG welding, which is a gas metal arc welding method using an inert gas or other gases such as carbon dioxide, oxygen, etc. as a shielding gas, and the selection of the shielding gas is generally dependent on the type of metal to be welded.
In the welding operation process, the gas supply amount and the distribution of gas are often very important for the welding quality, and particles splashed when welding wires drop in a molten pool are attached to the inner wall of the protective gas nozzle, so that the flow of the protective gas is gradually reduced, the welding bead forming effect is poor, and the particles are also adhered to the contact nozzle to cause the blockage of the welding wires.
Referring to fig. 1, the present embodiment provides a shield gas nozzle for arc welding, which includes a shield casing 1 disposed at the periphery of a contact tip 2, and having an open end in the direction of wire feeding of the contact tip 2 (below the shown), wherein the shield gas is supplied from a gas source through a gas supply channel to a position of the shield casing 1 near the open end and flows out from the open end, a welding wire 5 is driven by a wire supply member, such as a wire feeding wheel 6, and flows out from the contact tip 2, a protruding portion of the welding wire is melted by arc heat and drops, a molten pool is formed on the weld bead, and the shield gas forms a protective layer at the periphery of the molten pool to keep good surface quality after the molten pool is solidified.
The part of the protective cover body 1 close to the contact tip 2 is set as the inner wall surface of a rotator, preferably, the inner wall surface of the protective cover body is an annular arc surface, and can also be a conical surface narrowing inwards or a special-shaped surface with a flow guide groove, but all have inner wall surfaces externally connected with a rotator, wherein the axis of the rotator coincides with the axis of the contact tip 2.
In this way, a passage for receiving the flow of air is formed between the inner wall surface and the contact tip 2. In order to prevent the gas transmission channel from being blocked, the scraper 3 is further arranged in the channel and can be driven to rotate by taking the contact tip 2 as an axis, so that the scraper 3 can scrape off the attachments attached to the inner wall surface to keep the channel smooth.
Further, the scraper 3 includes a first blade 31 attached to the inner wall surface of the protective cover 1 for scraping off the adhered matter adhered to the inner wall surface of the protective cover 1, and the scraper 3 further includes a second blade 32 located at the periphery of the wire feeding port of the contact tip 2 for scraping off the adhered matter adhered to the contact tip.
Specifically, as shown in fig. 2, the first blade 31 of the scraper 3 has a first scraping surface 311, and the first scraping surface 311 is attached to an inner wall surface away from the open end of the protective cover 1 by a predetermined length for scraping off the adhered objects on the inner wall surface away from the open end by the predetermined length.
The first scraping surface 311 varies according to the contour of the inner wall surface of the protective cover 1, such as a tapered or arc surface that narrows inward, and a cylindrical inner wall is taken as an example in the following embodiments.
Generally, the splashed material can only splash to the inner wall of the protective cover 1 below the contact tip 2, and in order to specifically scrape off the attached splashed material, in this embodiment, the length of the first scraping surface 311 is the same as the length of the contact tip 2 from the open end, and the splashed material extending from the open end of the protective cover 1 to the inner wall of the contact tip 2 can be scraped.
Further, the first scraping surface 311 may be longer and the upper portion and the bottom portion thereof may be disposed at an acute angle, so that the airflow may adhere to the sidewall of the first blade 31 downward, thereby reducing interference with the airflow.
In an alternative embodiment, as shown in fig. 2, the first blade 31 in this embodiment is provided in a rod shape or a triangular plate shape, and is provided in two in a central symmetry manner, and is intended to provide an extending portion connected to the connection ring 331 and the first scraping surface 31 attached to the inner wall surface of the protective cover body 1, so that the spatter on the inner wall of the protective cover body 1 can be scraped.
Further, as shown in fig. 3, the first blade 31 is provided in an arc-shaped plate shape, and while having the first scraping surface 311, the first blade 31 is provided with a flow converging surface 312 in the passage, the flow converging surface 312 is parallel to the axis of the contact tip 2, and the flow converging surface 312 includes an arc surface capable of converging the air flow in a direction close to the axis of the contact tip 2.
Thus, when the scraper 3 rotates, the first scraping surface 311 on the first blade 31 scrapes off the splashes on the inner wall of the protective cover 1, and meanwhile, the flow collecting surface 312 plays a role in collecting the protective gas in the direction of the molten pool, so that the protective gas is blown into the molten pool more intensively, and the gloss and the formation of the weld bead are more effectively protected.
Furthermore, in another embodiment, as shown in fig. 4 and 5, the first blades 31 are disposed in two, and are distributed in a central symmetry manner, the outer portion of each first blade 31 has an arc-shaped first scraping surface 311, and a flow collecting surface 312 is disposed on the inner side of the first scraping surface 311, so that peripheral air flows can be collected inwards while the first blades 31 rotate, and the protective gas can be collected towards the molten pool, so that the protective gas is blown into the molten pool more intensively, and the gloss and the shape of the weld bead can be protected more effectively.
For scraping off the spatters at the contact tip 2, as shown in fig. 2 to 4, in particular, the second blade 32 has a second scraping surface 321 conforming to the bottom contour of the contact tip 2 for scraping off the adhered objects at the bottom of the contact tip 2.
In alternative embodiments, the second blades 32 may be provided in two, two second blades 32 are located on two sides of the contact tip 2, and do not interfere with the wire feeding, or a cross bar is provided, which is eccentrically located at the bottom of the contact tip 2 and does not move into the space for feeding the welding wire during the rotation, as shown in fig. 5, and an area reserved for the welding wire to pass through is formed in the middle during the rotation of the second blades 32.
In an alternative embodiment, second scraping surface 321 only scrapes the bottom surface of contact tip 2 and/or the bottom surface of contact tip 2 and the sides of the bottom, but leaves a gap for the welding wire to pass through at the wire outlet.
In the above embodiments, the blade is made of ceramic material, metal material or other composite material which is resistant to high temperature and has certain strength. The first blade 31 and the second blade 32 have a cross-sectional size in the passage as small as possible while securing strength to reduce interference with the air flow.
Preferably, as shown in fig. 3, the scraper 3 further includes a connecting portion 33 connecting the first blade 31 and the second blade 32, and the connecting portion 33 is configured in a cylindrical shape and extends upward to connect the driving means.
In an alternative embodiment, as shown in fig. 4 and 5, the connecting portion 33 is configured in a cylindrical/circular ring shape, is connected to the two first blades 31, and extends upward to be connected to the driving device.
In another embodiment, as shown in fig. 2, the connection portion 33 includes a connection ring 331 and a connection rod 332 fixed to the connection ring 331, the connection rod 332 extending upward to connect with the driving member.
In the present embodiment, as shown in fig. 1, preferably, the driving device for continuously rotating the scraper 3 preferably adopts a ring motor 4, wherein the connecting rod 332 or the cylindrical connecting portion 33 extends in the wire feeding direction and is connected to the output end of the ring motor 4 for driving the scraper 3 to rotate. Wherein, the ring motor is fixed to the side of the protection casing 1 near the direction of sending air, and the air flue bypasses the ring motor to the open end of the protection casing 1.
In alternative embodiments, the driving device may also be configured to drive the scraper to rotate, for example, by a motor and a gear ring, or other driving device configured to drive the scraper 3 to rotate, the motor drives a gear ring connected to the cylindrical connecting portion 33 to rotate through a gear at the output end, wherein the motor is mounted on the protective cover 1, and may be located inside or outside the protective cover 1, or other transmission structures may be used to drive the gear ring on the cylindrical connecting portion 33 to rotate.
In another embodiment, the driving device may also be connected to the feed wheel 6 via a transmission to rotate the doctor blade 3, the feed wheel 6 forming said driving device.
The invention provides another technical scheme, and an arc welding device comprises the protective gas nozzle for arc welding in the scheme.
The invention provides another scheme, and the method for cleaning the protective gas nozzle for the arc welding comprises the following steps: according to different splashing amounts corresponding to different welding wire materials, the driving device is controlled to adjust the scraper 3 to rotate at different rotating speeds so as to scrape the adhered matters on the inner wall of the protective cover body 1 and the bottom of the contact tube 2.
Example 1
Taking aluminum alloy as an example, the flow of protective gas can be 15-20L/min, the protective gas nozzle is welded at an arc welding gun, the welding wire contacts with a substrate to generate electric arc, the electric arc melts the welding wire and forms a molten pool on the surface of the substrate in a molten drop transition mode, the annular motor drives the scraper 3 to rotate at the speed of 60 revolutions/min, splashing in the electric arc printing and welding process is cleaned in real time, the protective gas nozzle and the conductive nozzle do not need to be replaced or cleaned, the wire blocking condition is prevented, and the forming efficiency is improved.
Example 2
Taking stainless steel as an example, the flow of the protective gas can be 20-25L/min, the protective gas nozzle is welded at an arc welding gun, the welding wire is contacted with the substrate to generate an arc, the arc melts the welding wire and forms a molten pool on the surface of the substrate in a molten drop transition mode, the annular motor drives the scraper 3 to rotate at the speed of 80 revolutions/min, splashing in the arc printing and welding process is cleared in real time, the protective gas nozzle and the conductive nozzle do not need to be replaced or cleared, the wire blockage condition is prevented, and the forming efficiency is improved.
Example 3
Taking titanium alloy as an example, the flow of protective gas can be 25-28L/min, the protective gas nozzle is welded at an arc welding gun, the welding wire contacts with a substrate to generate electric arc, the electric arc melts the welding wire and forms a molten pool on the surface of the substrate in a molten drop transition mode, the annular motor drives the scraper 3 to rotate at the speed of 100 revolutions/min, splashing in the electric arc printing and welding process is cleaned in real time, the protective gas nozzle and the conductive nozzle do not need to be replaced or cleaned, the wire blocking condition is prevented, and the forming efficiency is improved.
By combining the embodiment, the driving device is utilized to drive the scraper to rotate on the inner wall of the protection air faucet, so that splashes on the inner wall of the protection air faucet and at the bottom of the conductive head can be removed in real time, and the blades of the rotary scraper rotate to ensure that the protection gas is blown into molten pool metal to be more concentrated, so that the protection gas is more converged into the range of the molten pool, the luster and the formation of a welding bead are effectively protected, and meanwhile, the condition of uneven flow of the protection gas after the splashes are attached to the inner wall of the protection air faucet is also prevented.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (8)
1. A protection air cock for electric arc welding, its characterized in that includes:
the protective cover body is arranged at the periphery of the contact tube, has an opening end in the wire feeding direction of the contact tube, is provided with a rotator-shaped inner wall surface at the part close to the contact tube, and forms a channel for accommodating airflow to pass through between the inner wall surface and the contact tube;
the scraper is arranged in the channel and can be driven to rotate by taking the contact tip as an axis;
the scraper comprises a first blade attached to the inner wall surface of the protective cover body and used for scraping off adhesive substances adhered to the inner wall surface of the protective cover body, and a second blade located on the periphery of the wire feeding port of the conductive nozzle and used for scraping off the adhesive substances adhered to the conductive nozzle;
the first blade is provided with a current collecting surface positioned in the channel, the current collecting surface is parallel to the axis of the contact nozzle, and the current collecting surface comprises a cambered surface capable of collecting airflow in the direction close to the axis;
the first blade of the scraper is provided with a first scraping surface, and the first scraping surface is attached to the inner wall surface which is a preset length away from the opening end of the protection cover body and is used for scraping adhered objects which are in a preset length range away from the opening end on the inner wall surface.
2. The shield gas nozzle for arc welding according to claim 1, wherein said second blade has a second scraping surface which is fitted to the bottom profile of the contact tip for scraping the adhered substance from the bottom of the contact tip.
3. The shield gas nozzle for arc welding as claimed in claim 1, wherein the second blade is fixed to the first blade, and the first blade is provided with a connecting portion for connecting a driving means for driving the first blade to rotate.
4. The shield gas cap for arc welding according to any one of claims 1 to 3, wherein the scraper further comprises a connecting portion connecting the first blade and the second blade, the connecting portion being configured in a ring shape.
5. The shield gas nozzle for arc welding according to claim 4, further comprising a driving device, wherein the connecting portion extends in the wire feeding direction and is connected to an output end of the driving device for driving the scraper to rotate.
6. The shield gas nozzle for arc welding of claim 5, wherein the drive means comprises an annular motor.
7. An arc welding apparatus comprising the protective gas nozzle for arc welding according to claim 1.
8. The cleaning method of a protective gas nozzle for arc welding according to claim 1, characterized by comprising the steps of:
and controlling the adjusting scraper to rotate at different rotating speeds according to different splashing amounts corresponding to different welding wire materials, and scraping off the adhered matters on the inner wall of the protective cover body and the bottom of the contact tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011541293.6A CN112719541B (en) | 2020-12-23 | 2020-12-23 | Protective gas nozzle for electric arc welding and cleaning method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011541293.6A CN112719541B (en) | 2020-12-23 | 2020-12-23 | Protective gas nozzle for electric arc welding and cleaning method thereof |
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| Publication Number | Publication Date |
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| CN112719541A CN112719541A (en) | 2021-04-30 |
| CN112719541B true CN112719541B (en) | 2022-07-12 |
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| CN113681132B (en) * | 2021-05-13 | 2022-12-09 | 盐城合信智能装备有限公司 | Gun head of welding gun |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9016112U1 (en) * | 1990-11-27 | 1991-03-07 | Thielmann, Friedolin, 6342 Haiger, De | |
| JP3940302B2 (en) * | 2001-04-18 | 2007-07-04 | 株式会社ダイヘン | Semi-automatic sputter remover |
| JP3877201B2 (en) * | 2001-10-26 | 2007-02-07 | 新光機器株式会社 | Electrode cleaning device |
| JP3919772B2 (en) * | 2004-05-24 | 2007-05-30 | 本田技研工業株式会社 | Torch for MIG welding |
| CN208246021U (en) * | 2018-03-30 | 2018-12-18 | 东台市新杰科机械有限公司 | A kind of gas welding torch cleaning device |
| CN214212558U (en) * | 2020-12-23 | 2021-09-17 | 南京中科煜宸激光技术有限公司 | Protective gas nozzle for arc welding and arc welding device |
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