CN108838490A - A kind of arcing device for the control of underwater transverse weld appearance of weld - Google Patents
A kind of arcing device for the control of underwater transverse weld appearance of weld Download PDFInfo
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- CN108838490A CN108838490A CN201810796082.3A CN201810796082A CN108838490A CN 108838490 A CN108838490 A CN 108838490A CN 201810796082 A CN201810796082 A CN 201810796082A CN 108838490 A CN108838490 A CN 108838490A
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- weld
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- gas chamber
- outer cover
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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
- B23K9/0061—Underwater arc welding
-
- 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
- B23K9/02—Seam welding; Backing means; Inserts
-
- 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
- B23K9/321—Protecting means
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- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention discloses a kind of arcing device for the control of underwater transverse weld appearance of weld; it is related to welding technology field; including gas chamber outer cover, middle pipe and casing; interval pipe sleeve is set to jacket exterior; gas chamber outer cover is sheathed on outside middle pipe; protection gas chamber is formed between middle pipe and casing, forms plenum chamber between gas chamber outer cover and middle pipe；Protection gas chamber one end is provided with protection gas entrance, and the other end is provided with the outlet of protection gas, and plenum chamber one end is provided with high pressure gas entrance, and the other end is provided with high pressure gas outlet, and high pressure gas outlet is the annular opening that gas chamber outer cover and interval tube end enclose；Air curtain is being formed under the action of high pressure gas; water near welding gun is arranged; form the welding surroundings of a local desiccation; and can lower section while horizontal position welding in molten bath generate the protective gas that blows out obliquely upward under; finally; it prevents from dropping down under molten bath under the action of crosswind, effectively increases Underwater Welding quality.
Description
Technical field
The present invention relates to welding technology fields, more particularly to a kind of electricity for the control of underwater transverse weld appearance of weld
Arc device
Background technique
With the development of ocean engineering and the further exploitation of deep-sea resources, the importance of underwater welding technology is more aobvious prominent
Out.Especially in recent years, constantly improve with underwater welding technology, other industries of " paddling " in nuclear power, harbour, bridge etc.
It is increasingly becoming indispensable technology, especially underwater local dry cavity horizontal position welding technology.
Currently, there is a kind of magnetic control rotating excitation field welder, which is only used for land downhand welding welding, but by magnetic
It controls welding technique and is applied to the research of Underwater Welding operation also in blank；
Following problems are primarily present in existing underwater local dry cavity horizontal position welding technology：Adiabatic drying can not thoroughly be formed and held
Continuous, stable welding surroundings, molten bath is dropped down down under the effect of gravity in the welding process, influences welding quality；Therefore, city
Field, which needs one kind, can provide local desiccation for weld job and keep continual and steady operating environment, prevent from dropping down under molten bath, weld
High-quality underwater transverse weld appearance of weld control device.
Summary of the invention
The object of the present invention is to provide a kind of arcing devices for the control of underwater transverse weld appearance of weld, on solving
Problem of the existing technology is stated, provides the welding surroundings of a local desiccation for underwater horizontal position welding operation, and can effectively prevent molten
It is dropped down under pond, improves welding quality.
To achieve the above object, the present invention provides following schemes：
The present invention provide it is a kind of for underwater transverse weld appearance of weld control arcing device, including gas chamber outer cover, in
Pipe and casing, the interval pipe sleeve are set to outside described sleeve pipe, and the gas chamber outer cover is sheathed on outside the middle pipe, described
Protection gas chamber is formed between middle pipe and described sleeve pipe, forms the high pressure gas between the gas chamber outer cover and the middle pipe
Room；Described protection gas chamber one end is provided with protection gas entrance, and the other end is provided with the outlet of protection gas, and described plenum chamber one end is set
It is equipped with high pressure gas entrance, the other end is provided with high pressure gas outlet, and the high pressure gas outlet is the gas chamber outer cover and the interval
The annular opening that tube end encloses.
Optionally, one end of the gas chamber outer cover, the middle pipe and described sleeve pipe is provided with drive end bearing bracket, other end setting
There is rear end cap；Annular groove is provided on the drive end bearing bracket, and the annular groove bottom offers circumferential weld, the middle pipe and the gas chamber
Outer cover end is protruded into the annular groove, and the circumferential weld is connected with the high pressure gas outlet.
Optionally, protection gas-tpe fitting and high-pressure air pipe connector are provided on the rear end cap, and the protection tracheae connects
Head and the high-pressure air pipe connector are connected with the protection gas entrance and the high pressure gas entrance respectively.
Optionally, first through hole, the first through hole internal diameter and described sleeve pipe outer diameter phase are provided on the drive end bearing bracket
Match, and the first through hole is threadedly coupled with described sleeve pipe；The second through-hole is provided on the rear end cap, in second through-hole
Diameter matches with described sleeve pipe outer diameter, and described sleeve pipe passes through second through-hole.
Optionally, the protection gas outlet is set on the drive end bearing bracket and is located at below the first through hole, and described
Protection gas, which exports, is provided with valve, and after the valve opening, protection gas is blown out obliquely by protection gas outlet.
Optionally, the gas chamber outer cover includes conically shaped and the pillar buoy that connect with the conically shaped big end, the taper
Cylinder small end and the interval tube end form the high pressure gas outlet.
Optionally, described sleeve pipe outer wall is provided with magnet exciting coil, and the magnet exciting coil is electrically connected with external power supply, the set
Soft magnetic materials is provided in the protection gas chamber on pipe top, the soft magnetic materials is fixed in the card slot on the drive end bearing bracket.
Optionally, the first positioning shaft shoulder and the second positioning shaft shoulder have been arranged circumferentially on described sleeve pipe outer wall, described first is fixed
The position shaft shoulder and second positioning shaft shoulder are respectively arranged at the both ends of the magnet exciting coil, and the drive end bearing bracket and the rear end cap
It is resisted against in first positioning shaft shoulder and second positioning shaft shoulder.
Optionally, water conservancy diversion flange, the water conservancy diversion flange and the middle pipe one have been arranged circumferentially in the interval pipe outer wall
Body formed setting, and there are gaps between water conservancy diversion flange outer and the gas chamber outer cover inner wall.
Optionally, the middle pipe and the gas chamber outer cover are threadedly coupled with the rear end cap.
The present invention achieves following technical effect compared with the existing technology：
Arcing device provided by the present invention for the control of underwater transverse weld appearance of weld, under the action of high pressure gas
Air curtain is being formed, the water near welding gun is arranged, provides a local desiccation and continual and steady weldering for Underwater Welding operation
Connect environment；Lower section while horizontal position welding in molten bath generates the protective gas blown out obliquely upward under, holds molten bath upwards, has
Effect prevents from dropping down under molten bath, to effectively improve welding quality.
Further, after magnet exciting coil is powered with the soft magnetic materials collective effect above magnet exciting coil above coil axis
Magnetic loop is formed, the magnetic induction line direction above molten bath is upward, upward active force is generated to molten bath, thus mating protection gas,
The magnetic field for effectivelying prevent dropping down under molten bath, while generating passes through metal bath, induces electric current wherein, the induced current and magnetic field
Interaction generates electromagnetic force (Ampere force), and electromagnetic force is body force, is acted on metal bath volume element, so as to push gold
Belong to molten bath movement, thinning microstructure is stirred to molten bath under the action of a magnetic force, further improves welding quality；
Further, protecting the air-cooled effect of gas can cool down to the protection indoor magnet exciting coil of gas, avoid excitation wire
Enclose the excessively high influence magnetic field strength of temperature.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the longitudinal cross-section section view of the arcing device controlled provided by the present invention for underwater transverse weld appearance of weld
Figure；
Fig. 2 is that the detonation configuration of the arcing device controlled provided by the present invention for underwater transverse weld appearance of weld is illustrated
Figure；
Fig. 3 is that the working condition of the arcing device controlled provided by the present invention for underwater transverse weld appearance of weld is shown
Figure；
Wherein, 1- gas chamber outer cover；Pipe in 2-；3- casing；4- drive end bearing bracket；5- rear end cap；6- magnet exciting coil；7- soft magnetism material
Material；The first positioning shaft shoulder of 8-；The second positioning shaft shoulder of 9-；10- protects gas entrance；11- high pressure gas entrance；12- high pressure gas outlet；
13- circumferential weld；14- valve；15- water conservancy diversion flange；16- welding gun；17- snorkel；18- throttle valve；19- protects gas chamber；20- high pressure gas
Room.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of arcing devices for the control of underwater transverse weld appearance of weld, on solving
Problem of the existing technology is stated, provides the welding surroundings of a local desiccation for underwater horizontal position welding operation, and can effectively prevent molten
It is dropped down under pond, improves welding quality.
The present invention provide it is a kind of for underwater transverse weld appearance of weld control arcing device, including gas chamber outer cover, in
Pipe and casing, the interval pipe sleeve are set to outside described sleeve pipe, and the gas chamber outer cover is sheathed on outside the middle pipe, described
Protection gas chamber is formed between middle pipe and described sleeve pipe, forms the high pressure gas between the gas chamber outer cover and the middle pipe
Room；Described protection gas chamber one end is provided with protection gas entrance, and the other end is provided with the outlet of protection gas, and described plenum chamber one end is set
It is equipped with high pressure gas entrance, the other end is provided with high pressure gas outlet, and the high pressure gas outlet is the gas chamber outer cover and the interval
The annular opening that tube end encloses.
Provided by the present invention for the arcing device of underwater transverse weld appearance of weld control, height is passed through into plenum chamber
It calms the anger after body, high pressure gas sprays to form air curtain from high pressure gas outlet, and the water near welding gun is arranged, and mentions for Underwater Welding operation
A local desiccation and continual and steady welding surroundings are supplied；Lower section while horizontal position welding in molten bath generates under obliquely upward
The protective gas of blowout, holds molten bath upwards, effectively prevent dropping down under molten bath, to effectively improve welding quality.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1-3 is please referred to, the present invention provides a kind of arcing device for the control of underwater transverse weld appearance of weld, packets
Gas chamber outer cover 1, middle pipe 2 and casing 3 are included, middle pipe 2 is sheathed on outside casing 3, and gas chamber outer cover 1 is sheathed on outside middle pipe 2,
Protection gas chamber is formed between middle pipe 2 and casing 3, forms plenum chamber between gas chamber outer cover 1 and middle pipe 2；Protect gas chamber one
End is provided with protection gas entrance 10, and the other end is provided with the outlet of protection gas, and plenum chamber one end is provided with high pressure gas entrance 11, separately
One end is provided with high pressure gas outlet 12, and high pressure gas outlet 12 is gas chamber outer cover 1 and the annular opening that 2 end of middle pipe encloses.
Provided by the present invention for the control of underwater transverse weld appearance of weld arcing device work when, welding gun is from hollow
It is passed through among casing 3, and exposes welding rod end in 3 one end of casing；High pressure gas entrance 11 is connected with external air compressor machine, high pressure
Be provided with pressure regulator valve and throttle valve on pipeline between gas entrance 11 and air compressor machine, start air compressor machine, to gas carry out pressure and
Flow control, to plenum chamber 20 inside be passed through high pressure gas, thus high pressure gas from high pressure gas outlet 12 spray, device just
Front forms annular air curtain, and the water near welding gun is arranged, and forms the welding surroundings of a local desiccation；Welding while by
Protection gas entrance 10 is passed through protective gas into protection gas chamber 19, and Open valve 14 simultaneously controls protective gas injection direction, so that
Protective gas sprays to hold molten bath obliquely, effectively improves welding quality.
Further, one end of gas chamber outer cover 1, middle pipe 2 and casing 3 is provided with drive end bearing bracket 4, and the other end is provided with rear end
Lid 5；Annular groove is provided on drive end bearing bracket 4, and annular groove bottom offers circumferential weld 13, annular groove is protruded into 1 end of the middle gentle outdoor cover of pipe 2
In, and circumferential weld 13 is connected with high pressure gas outlet 12.
The internal diameter and outer diameter that circumferential weld 13 is become larger along spraying high-pressure gas orient diameter, so that after high pressure gas sprays
In " tubaeform ", the volume of dry place is expanded；
Further, it is provided with protection gas-tpe fitting and high-pressure air pipe connector on rear end cap 5, and protects gas-tpe fitting and height
Pipe fitting of calming the anger is connected with protection gas entrance 10 and high pressure gas entrance 11 respectively, and protection gas-tpe fitting is convenient for passing through snorkel 17
It is connect with protection gas cylinder, high-pressure air pipe connector is convenient for connecting by snorkel 17 with air compressor machine, guarantees that the gas of weld job supplies
It answers.
Further, first through hole is provided on drive end bearing bracket 4, first through hole internal diameter matches with 3 outer diameter of casing, and first
Through-hole is connect with casing threads；The second through-hole is provided on rear end cap 5, the second through-hole internal diameter matches with 3 outer diameter of casing, and covers
Pipe 3 passes through the second through-hole.
Further, the outlet of protection gas is set on drive end bearing bracket 4 and is located at below the first through hole, and protects gas outlet
On be provided with valve 14, after valve 14 is opened, protection gas is blown out obliquely by the outlet of protection gas.
Valve 14 includes baffle and circular shaft, and baffle is mounted in the axis hole of drive end bearing bracket 4 by circular shaft, and circular shaft is cased with reset bullet
Spring, when there is protective gas to be passed through, deformation occurs for reset spring, and baffle is opened, and when not having gas to be passed through, reset spring is returned
Multiple power effect is so that flapper closure；Baffle both ends are about the asymmetric setting of circular shaft, when protecting gas charge flow rate to increase, by lever
Principle, the power that one side baffle of circular shaft is subject to is greater than the power that another side baffle of circular shaft is subject to, therefore baffle opening increases, and then controls
The blowout angle and flow of protective gas.
Further, gas chamber outer cover 1 includes conically shaped and the pillar buoy connecting with conically shaped big end, and conically shaped small end is in
2 end of pipe forms high pressure gas outlet 12；The taper barrel structure of gas chamber outer cover 1 increases high pressure gas in direction of travel flow velocity
Greatly, it is finally gathered at high pressure gas outlet 12 and sprays, form the air curtain of high-voltage-stable in front of device, enhance the draining of device
Ability.
3 outer wall of casing is provided with magnet exciting coil 6, and magnet exciting coil 6 is electrically connected with external power supply, first chamber on 3 top of casing
Interior is provided with soft magnetic materials 7, and soft magnetic materials 7 is fixed in the card slot on drive end bearing bracket 4.
7 collective effect of soft magnetic materials after the energization of magnet exciting coil 6 with 6 top of magnet exciting coil is above 6 axis of magnet exciting coil
Magnetic loop is formed, the magnetic induction line direction above molten bath is upward, upward active force is generated to molten bath, thus mating protection gas,
The magnetic field for effectivelying prevent dropping down under molten bath, while generating passes through metal bath, induces electric current wherein, the induced current and magnetic field
Interaction generates electromagnetic force (Ampere force), and electromagnetic force is body force, is acted on metal bath volume element, so as to push gold
Belong to molten bath movement, thinning microstructure is stirred to molten bath under the action of a magnetic force, further improves welding quality.
Further, the first positioning shaft shoulder 8 and the second positioning shaft shoulder 9, the first locating shaft have been arranged circumferentially on 3 outer wall of casing
Shoulder 8 and the second positioning shaft shoulder 9 are respectively arranged at the both ends of magnet exciting coil 6, and drive end bearing bracket 4 and rear end cap 5 are resisted against first and determine
On the position shaft shoulder 8 and the second positioning shaft shoulder 9.
First positioning shaft shoulder and the second positioning shaft shoulder not only play position-limiting action to magnet exciting coil 6, prevent it by magnetic field
Power is moved along casing 3, and to drive end bearing bracket 4 and rear end cap 5, also plays position-limiting action, drive end bearing bracket 4 and rear end cap 5 are in device
Front and back ends be threadedly coupled and be finally resisted against in the first positioning shaft shoulder 8 and the second positioning shaft shoulder 9 with casing 3 respectively, cover simultaneously
It is additionally provided with fastening nut on pipe 3, rear end cap and the second positioning shaft shoulder are compressed；The above technical characteristic effectively increases device
Globality and stress intensity, so that device is still able to maintain stability and leakproofness under the action of high pressure gas.
Further, be arranged circumferentially water conservancy diversion flange 15 on middle 2 outer wall of pipe, water conservancy diversion flange 15 and 2 one of middle pipe at
Type setting, and there are gaps between 1 inner wall of 15 outer of water conservancy diversion flange and gas chamber outer cover.
High pressure gas encounters the surrounding that water conservancy diversion flange 15 flows to plenum chamber 20, and air-flow homogenizes in the process, most
The inner wall along plenum chamber 20 forms uniform annular airflow eventually, guarantees the high pressure air curtain that stable and uniform is formed after gas sprays.
Further, the gentle outdoor cover 1 of middle pipe 2 is threadedly coupled with rear end cap 5.
Specific examples are applied in the present invention, and principle and implementation of the present invention are described, above embodiments
Illustrate to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, according to
According to thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification
It should not be construed as limiting the invention.
Claims (10)
1. a kind of arcing device for the control of underwater transverse weld appearance of weld, it is characterised in that：Including gas chamber outer cover, interval
Pipe and casing, the interval pipe sleeve be set to described sleeve pipe outside, the gas chamber outer cover is sheathed on outside the middle pipe, it is described in
Protection gas chamber is formed between pipe and described sleeve pipe, forms the plenum chamber between the gas chamber outer cover and the middle pipe；
Described protection gas chamber one end is provided with protection gas entrance, and the other end is provided with the outlet of protection gas, plenum chamber one end setting
There is high pressure gas entrance, the other end is provided with high pressure gas outlet, and the high pressure gas outlet is the gas chamber outer cover and the middle pipe
The annular opening that end encloses.
2. the arcing device according to claim 1 for the control of underwater transverse weld appearance of weld, it is characterised in that：Institute
The one end for stating gas chamber outer cover, the middle pipe and described sleeve pipe is provided with drive end bearing bracket, and the other end is provided with rear end cap；The front end
It covers and is provided with annular groove, and the annular groove bottom offers circumferential weld, the middle pipe and gas chamber outer cover end are protruded into described
In annular groove, and the circumferential weld is connected with high pressure gas outlet.
3. the arcing device according to claim 2 for the control of underwater transverse weld appearance of weld, it is characterised in that：Institute
It states and is provided with protection gas-tpe fitting and high-pressure air pipe connector on rear end cap, and the protection gas-tpe fitting and the high-pressure air pipe connect
Head is connected with the protection gas entrance and the high pressure gas entrance respectively.
4. the arcing device according to Claims 2 or 3 for the control of underwater transverse weld appearance of weld, feature exist
In：First through hole is provided on the drive end bearing bracket, the first through hole internal diameter matches with described sleeve pipe outer diameter, and described first
Through-hole is threadedly coupled with described sleeve pipe；The second through-hole, the second through-hole internal diameter and described sleeve pipe are provided on the rear end cap
Outer diameter matches, and described sleeve pipe passes through second through-hole.
5. the arcing device according to claim 4 for the control of underwater transverse weld appearance of weld, it is characterised in that：Institute
It states the outlet of protection gas to be set on the drive end bearing bracket and be located at below the first through hole, and is provided in protection gas outlet
Valve, after the valve opening, protection gas is exported by the protection gas and is blown out obliquely.
6. the arcing device according to claim 1 for the control of underwater transverse weld appearance of weld, it is characterised in that：Institute
State the pillar buoy that gas chamber outer cover includes conically shaped and connect with the conically shaped big end, the conically shaped small end and the middle pipe
End forms the high pressure gas outlet.
7. the arcing device according to claim 1 for the control of underwater transverse weld appearance of weld, it is characterised in that：Institute
It states sleeve outer wall and is provided with magnet exciting coil, the magnet exciting coil is electrically connected with external power supply, the protection gas chamber on described sleeve pipe top
It is inside provided with soft magnetic materials, the soft magnetic materials is fixed in the card slot on the drive end bearing bracket.
8. the arcing device according to claim 7 for the control of underwater transverse weld appearance of weld, it is characterised in that：Institute
It states and has been arranged circumferentially the first positioning shaft shoulder and the second positioning shaft shoulder on sleeve outer wall, first positioning shaft shoulder and described second is determined
The position shaft shoulder is respectively arranged at the both ends of the magnet exciting coil, and the drive end bearing bracket and the rear end cap are resisted against described first and determine
On the position shaft shoulder and second positioning shaft shoulder.
9. the arcing device according to claim 1 for the control of underwater transverse weld appearance of weld, it is characterised in that：Institute
It states and has been arranged circumferentially water conservancy diversion flange in interval pipe outer wall, the water conservancy diversion flange and the middle pipe are integrally formed and are arranged, and described
There are gaps between water conservancy diversion flange outer and the gas chamber outer cover inner wall.
10. the arcing device according to claim 4 for the control of underwater transverse weld appearance of weld, it is characterised in that：
The middle pipe and the gas chamber outer cover are threadedly coupled with the rear end cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810796082.3A CN108838490A (en) | 2018-07-19 | 2018-07-19 | A kind of arcing device for the control of underwater transverse weld appearance of weld |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810796082.3A CN108838490A (en) | 2018-07-19 | 2018-07-19 | A kind of arcing device for the control of underwater transverse weld appearance of weld |
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| CN108838490A true CN108838490A (en) | 2018-11-20 |
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| CN201810796082.3A Pending CN108838490A (en) | 2018-07-19 | 2018-07-19 | A kind of arcing device for the control of underwater transverse weld appearance of weld |
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| CN110587070A (en) * | 2019-08-28 | 2019-12-20 | 华南理工大学 | Amphibious in-situ electric arc additive manufacturing equipment and method |
| CN110587070B (en) * | 2019-08-28 | 2023-09-29 | 华南理工大学 | Amphibious in-situ arc additive manufacturing equipment and method |
| CN113145954A (en) * | 2021-03-30 | 2021-07-23 | 广西天正钢结构有限公司 | Bridge welding device and bridge welding method |
| CN113145954B (en) * | 2021-03-30 | 2023-03-24 | 广西天正钢结构有限公司 | Bridge welding device and bridge welding method |
| CN113996900A (en) * | 2021-12-17 | 2022-02-01 | 山东建筑大学 | Welding protection device and method for fan reinforcing welding nail |
| CN113996900B (en) * | 2021-12-17 | 2024-01-26 | 山东建筑大学 | Welding protection device and method for fan reinforcement welding nails |
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Application publication date: 20181120 |