CN107775162A - Underwater wet welding bubble regulation device - Google Patents
Underwater wet welding bubble regulation device Download PDFInfo
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- CN107775162A CN107775162A CN201711041781.9A CN201711041781A CN107775162A CN 107775162 A CN107775162 A CN 107775162A CN 201711041781 A CN201711041781 A CN 201711041781A CN 107775162 A CN107775162 A CN 107775162A
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- welding
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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
-
- 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
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
- B23K9/29—Supporting devices adapted for making use of shielding means
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- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention relates to underwater wet welding field, and in particular to a kind of underwater wet welding bubble regulation device.The underwater wet welding bubble regulation device includes the fixation clamping portion and bubble regulation and control portion being connected with each other；The fixed part for fixing underwater wet method welding gun is provided with the fixed clamping portion；The bubble regulation and control portion is provided with through hole, and the through hole is used for through welding wire or welding rod；The lower surface in the bubble regulation and control portion is used to regulate and control the diffusion of arc bubble, and the welding ends of the welding wire or welding rod is exposed to the downside of the lower surface in the bubble regulation and control portion.The underwater wet welding bubble regulation device of the present invention, enables to the quality of weld joint of underwater wet welding to improve, and simple in construction, and processing cost is low, simple to operate, and strong adaptability is easy to spread.
Description
Technical field
The present invention relates to underwater wet welding field, and in particular to a kind of underwater wet welding bubble regulation device.
Background technology
It is increasingly extensive for the demand of underwater wet welding with the fast development of ocean engineering technology, for example, marine work
Make the construction and reparation of platform, offshore oilfield pipeline, offshore engineering works etc., this is due to that underwater wet welding has cost
The advantages of low, equipment is simple, strong adaptability.
Underwater wet welding is the welding method for directly carrying out welding to workpiece in water, in welding process, electric arc and water
Between there is no any mechanical protection measures, electric arc only leans on caused arc bubble and the water of surrounding in welding process to separate and protected
Shield.Wherein, arc bubble is the bubble that gas is formed around electric arc, forms the gas of arc bubble and includes arc heat decomposition water
Vapor, hydrogen, carbon monoxide, carbon dioxide etc. caused by caused hydrogen and oxygen and electrode material burning.
Under water during wet method welding, arc bubble is in metastable condition, can constantly grow up, ruptures, float
Effusion, at the same time new bubble formation, loop cycle, as shown in Figure 1.
Welding Molten Drop can be acted on by gas drag force in arc bubble floating-upward process, hinder droplet transfer, welding
Molten drop, which is easily ostracised, deviates welding wire axis, is formed and repels transition, cause welding arc unstable, easily produce splashing, influenceed
Quality of weld joint.
Being stabilized for bubble is key that underwater wet welding is stabilized progress, however, being welded at present to underwater wet method
The research connect is concentrated mainly on improvement and optimization to welding material, for how to eliminate bubble floating to caused by the droplet transfer
Adverse effect, research is seldom, is unfavorable for underwater welding technology and obtains tremendous development and popularization and application.
The content of the invention
In view of this, it is an object of the invention to provide a kind of underwater wet welding bubble regulation device, to solve water
The problem of quality of weld joint caused by arc bubble floats in lower wet method welding has much room for improvement.
To reach above-mentioned purpose, the present invention uses following technical scheme：
A kind of underwater wet welding bubble regulation device, including the fixation clamping portion of interconnection and bubble regulation and control portion,
The fixed part for fixing underwater wet method welding gun is provided with the fixed clamping portion, the bubble regulation and control portion is provided with through hole,
The through hole is used for through welding wire or welding rod, and the lower surface in the bubble regulation and control portion is used to regulate and control the diffusion of arc bubble, institute
The welding ends of welding wire or welding rod is stated exposed to the downside of the lower surface in the bubble regulation and control portion.
Preferably, the lower surface in the bubble regulation and control portion is plane or inner concave.
Preferably, the inner concave is sphere or ellipsoid.
Preferably, the fixed part is the through hole being arranged in the fixed clamping portion, is provided with the through hole
Location structure, the location structure are used to position the underwater wet method welding gun.
Preferably, the through hole includes shoulder hole, and the shoulder hole includes enlarged diameter section and reduced diameter section, described big
The junction of diameter segment and reduced diameter section forms step surface, and the step surface forms location structure.
Preferably, seal is provided with the step surface, between the through hole and underwater wet method welding gun
Gap sealing.
Preferably, there is gap between the through hole and underwater wet method welding gun；Preferably, the inwall of the through hole and
Minimum clearance between the outer wall of underwater wet method welding gun is 1-2mm.
Preferably, uropore has been radially arranged along the through hole on the lower surface in the bubble regulation and control portion, for accommodating
The weld seam formed in welding process.
Preferably, the size of the cross section of the uropore is more than the reinforcement of the weld seam.
Preferably, the material in the bubble regulation and control portion is red copper.
Beneficial effect：
Underwater wet welding bubble regulation device in the present invention, regulate and control arc burning using the lower surface in bubble regulation and control portion
During caused arc bubble float, reduce gas bubble light soil, reduce gas drag force to a greater extent to the droplet transfer
Influence, improve welding arc stablility, improve the quality of welding point.
Underwater wet welding bubble regulation device in the present invention, between the lower surface in bubble regulation and control portion and workpiece to be welded
Gaseous environment completely cut off directly contacting for water and electric arc so that the underwater wet method weldering between bubble regulation and control portion and workpiece to be welded
Connect and welded similar to underwater local dry cavity, gas shield effect is played to underwater wet welding, improves quality of weld joint.
Underwater wet welding bubble regulation device in the present invention, simple in construction, processing cost is low, simple to operate, adapts to
Property is strong, easy to spread.
To sum up, underwater wet welding bubble regulation device of the invention, the welding point of underwater wet welding is enabled to
Quality advance, and it is simple in construction, processing cost is low, simple to operate, and strong adaptability is easy to spread.
Brief description of the drawings
By the description of this invention referring to the drawings, above-mentioned and other objects, features and advantages of the invention will
It is apparent.
Fig. 1 is welding wire underwater wet welding arc bubble floating dynamic schematic diagram in background technology, wherein, a puts out for electric arc
During arc；When b is that electric arc starts burning；When c is that arc stability burns；
Fig. 2 is underwater wet welding process when the lower surface in bubble regulation and control portion in the specific embodiment of the invention is ellipsoid
Side view；
Fig. 3 is underwater wet welding process side when the lower surface in bubble regulation and control portion in the specific embodiment of the invention is plane
View；
Fig. 4 is wet method welding process schematic perspective view under specific embodiment of the invention reclaimed water.
In figure：
1st, fixed clamping portion；11st, fixed part；111st, enlarged diameter section；112nd, reduced diameter section；
2nd, underwater wet method welding gun；
3rd, bubble regulation and control portion；31st, through hole；32nd, uropore；
4th, arc bubble；
5th, welding wire or welding rod；
6th, sealing device；
7th, workpiece to be welded；
8th, ignition tip；
9th, electric arc.
Embodiment
Below based on embodiment, present invention is described, it should be understood by one skilled in the art that provided herein
Accompanying drawing is provided to the purpose of explanation, and accompanying drawing is not necessarily drawn to scale.
Unless the context clearly requires otherwise, otherwise entire disclosure is similar with the " comprising " in claims, "comprising" etc.
Word should be construed to the implication included rather than exclusive or exhaustive implication；That is, it is containing for " including but is not limited to "
Justice.
As shown in Figures 2 to 4, the invention discloses a kind of underwater wet welding bubble regulation device, including it is connected with each other
Fixation clamping portion 1 and bubble regulation and control portion 3, be provided with the fixed clamping portion 1 for fixing consolidating for underwater wet method welding gun 2
Determine portion 11, the fixed part 11 for example can be the through hole being arranged in the fixed clamping portion 1, the through hole be used to accommodate and
Fixed underwater wet method welding gun 2；The bubble regulation and control portion 3 is provided with through hole 31, and through hole 31 is used for through welding wire or welding rod 5；Gas
The lower surface for steeping regulation and control portion 3 is used to regulate and control the diffusion of arc bubble 4.
Fixation clamping portion 1 and bubble regulation and control portion 3 in the present invention can be integrally formed, and can also pass through screw thread, welding etc.
Mode is fixedly connected into an entirety.
In the present invention, after underwater wet method welding gun 2 is arranged in fixed clamping portion 1, welding wire or welding rod 5 are adjusted through bubble
The through hole 31 in control portion 3.Preferably, gap between welding wire or welding rod 5 and the through hole 31 in bubble regulation and control portion 3 be present, and welding wire or
The welding ends of person's welding rod 5 is below the lower surface in bubble regulation and control portion 3.
In the present invention, welding wire can be flux-cored wire.
In the present invention, the lower surface in bubble regulation and control portion 3 is not only to the inhibition that is raised of arc bubble 4, and to electricity
The rising of arc bubble 4 play the guiding role.Specifically, the lower surface in bubble regulation and control portion 3 is plane or inner concave.Inner concave it is interior
Concave side is relative with workpiece 7 to be welded.Preferably, the inner concave is sphere or ellipsoid, be can be achieved to the more preferable of bubble
It is oriented to.
In the present invention, after the shape fixation of the lower surface in bubble regulation and control portion 3, the size ginseng of the lower surface in bubble regulation and control portion 3
Number can also impact to the floating of arc bubble 4, for example, when the lower surface in bubble regulation and control portion 3 is plane, the area of plane
Bigger, the ascent rate of arc bubble 4 is slower, and the area of plane is smaller, and the ascent rate of arc bubble 4 gets over block；When bubble is adjusted
When the lower surface in control portion 3 is sphere, the surface area of sphere is bigger, and the ascent rate of arc bubble 4 is slower, and the surface area of sphere is got over
Small, the ascent rate of arc bubble 4 gets over block；When the lower surface in bubble regulation and control portion 3 is ellipsoid, the surface area of ellipsoid is got over
Greatly, the ascent rate of arc bubble 4 is slower, and the surface area of ellipsoid is smaller, and the ascent rate of arc bubble 4 gets over block.Preferably,
The area of the lower surface in the bubble regulation and control portion 3 is 300mm2-3000mm2。
In the present invention, fixed part 11 is provided with location structure, and location structure is used to be located at fixed part to underwater wet method welding gun 2
11 position is positioned.Preferably, the fixed part is through hole, and the part of the through hole is shoulder hole, another portion
It is divided into bellmouth.The shoulder hole includes enlarged diameter section 111 and reduced diameter section 112, the reduced diameter section 112 and bellmouth of shoulder hole
Bigger diameter end it is corresponding.Step surface is formed in the junction of the enlarged diameter section 111 and reduced diameter section 112, the step surface is fixed
Bit architecture.It is of course also possible to use other location structures, for example, screw positions.
On the one hand above-mentioned through hole ensures that the ignition tip 8 of at least underwater wet method welding gun 2 is arranged on the inside of through hole, another
After aspect ensures that the ignition tip 8 of underwater wet method welding gun 2 fixes welding wire or welding rod 5, the welding ends of welding wire or welding rod 5 can be sudden and violent
It is exposed at below the lower surface in bubble regulation and control portion 3, and then the welding that can be well on.
Preferably, gap be present between the through hole and underwater wet method welding gun 2.Preferably, the inwall of the through hole
Minimum clearance between the outer wall of underwater wet method welding gun 2 is 1-2mm, so so that underwater wet method welding gun 2 can easily pacify
Loaded in fixed clamping portion 1, and easily the underwater wet method welding gun 2 can be operated.
Preferably, it is arranged concentrically between through hole and through hole 31, so as to ensure smoothly to install underwater wet method welding gun 2 and welding wire
Or welding rod 5.
Preferably, it is provided with sealing device 6 between underwater wet method welding gun 2 on the inside of through hole.Specifically, the sealing dress
Put on the 6 settings step surface that wet method welding gun 2 and enlarged diameter section 111, the junction of reduced diameter section 112 are formed under water, so can
Realization seals well to the gap between through hole and underwater wet method welding gun 2, when on the arc bubble 4 formed in welding process
When floating, arc bubble 4 can be prevented to be floated from the gap between underwater wet method welding gun 2 and through hole, so as to reduce arc bubble 4
Ascending path, slow down the rate of climb of arc bubble 4, and then stable welding arc 9, increase the quality of welding point.
Specifically, uropore 32 has been radially arranged along through hole 31 on the lower surface in bubble regulation and control portion 3, had been welded for accommodating
The weld seam formed in journey, the size of the cross section of the uropore 32 are more than the reinforcement for the weld seam that welding is formed.Using welding by two
After workpiece 7 to be welded is fixed together, the weld seam of formation can be higher than the surface of workpiece 7 to be welded, that is, forms reinforcement, reinforcement can make
Obtain and form sideshake between the lower surface in bubble regulation and control portion 3 and the upper surface of workpiece to be welded 7, so that arc bubble 4 from this
Individual sideshake floats, and set uropore 32 so that weld seam is contained in uropore 32, can avoid the lower surface in bubble regulation and control portion 3 with
Sideshake between the upper surface of workpiece 7 to be welded, so as to reduce the path of the rising of arc bubble 4, slow down the rising of arc bubble 4
Speed, stablize welding arc 9, increase the quality of welding point.
Preferably, the material in bubble regulation and control portion 3 is red copper.Because welding is to melt workpiece 7 to be welded using localized hyperthermia
And welding wire or welding rod 5 so that the connected mode that workpiece to be welded 7 is fixed together, thus in welding wire or
Regional area between welding rod 5 and workpiece to be welded 7, temperature is very high, in order that electric arc can not be soldered by obtaining bubble regulation and control portion 3
9 high temperature, the material in bubble regulation and control portion 3 should use the material of high heat conductance, and the thermal conductivity of red copper is very high, Neng Gouji
When conduct heat in the water of surrounding, be not melted, meet requirement.
When carrying out underwater wet welding using the underwater wet welding bubble regulation device of the present invention, pass through electrode burning one
Aspect melts workpiece 7 to be welded, on the other hand melts welding wire or welding rod 5, and welding is realized in then solidification.
When carrying out underwater wet welding using the underwater wet welding bubble regulation device of the present invention, the production of arc bubble 4
As the generation principle of prior art, but when arc bubble 4 floats, arc bubble 4 can be regulated and controled raw principle by bubble
The regulating and controlling effect of the lower surface in portion 3, the speed that arc bubble 4 rises decline, the lower end of bubble regulation and control portion 3 and workpiece 7 to be welded it
Between the quantity of arc bubble 4 increase in unit volume, more arc bubble cavitys are formed around electric arc, so as to be welded
The regional area for being similar to the welding of underwater local dry cavity is formed between workpiece 7 and bubble regulation and control portion 3, underwater wet welding is played
Gas shield is acted on, and obtains the underwater wet welding joint strengthened through mechanical assistance, and the quality of welding point is improved.
Using the present invention underwater wet welding bubble regulation device carry out underwater wet welding when, arc bubble 4 it is upper
Lifting speed declines, so that gas is reduced to the drag force of droplet transfer, the stability of welding arc 9 is added, so as to subtract
It is few to splash, add the quality of welding point.
The present invention underwater wet welding bubble regulation device, control arc bubble 4 mode have it is following several：
1st, the control to arc bubble 4 is realized by the distance on lower surface to the surface of workpiece 7 to be welded in bubble regulation and control portion 3
System；
2nd, the control to arc bubble 4 is realized by the shape of the lower surface in bubble regulation and control portion 3；
3rd, the control to arc bubble 4 is realized by the face size size of the lower surface in bubble regulation and control portion 3.
Further the underwater wet welding bubble regulation device of the present invention is entered below by embodiment one and embodiment two
Row is introduced.
Embodiment one
Step 1: brass bar endoporus to be machined into the shape to match with underwater wet method welding gun 2, fixed clamping is formed
Portion 1, fixed clamping portion 1 and underwater wet method welding gun 2 leave gap, and gap width is chosen for 1-2mm；
Step 2: opening up through hole 31 in the axle center of red copper bar, the diameter of through hole 31 is chosen for 1-5mm, by red copper bar lower surface
It is arranged to plane, ellipsoid or sphere, forms bubble regulation and control portion 3, fixed clamping portion 1 is connected with bubble regulation and control portion 3 by screw thread
Connect；
Step 3: underwater wet method welding gun 2 to be extend into the through hole in fixed clamping portion 1, welding wire or welding rod 5 penetrate bubble
The through hole 31 in regulation and control portion 3, the step surface of the through hole in fixed clamping portion 1 are sealed with underwater wet method welding gun 2 by sealing device；
Step 4, workpiece 7 to be welded is fixed with fixture, the lower surface in bubble regulation and control portion 3 and the upper surface of workpiece 7 to be welded
Distance be arranged to 1-15mm so that the distance of the bottom of ignition tip 8 to the upper surface of workpiece 7 to be welded is 10mm；
Step 5, welding current 100A, arc voltage 20V, speed of welding 20mm/min are chosen, carries out underwater wet method weldering
Connect.
In the present embodiment, workpiece 7 to be welded is steel plate, further, steel plate be ordinary low-carbon steel, low-alloy steel either
Stainless steel.A diameter of 1.0-1.6mm of welding wire, a diameter of 3.2mm of welding rod.The selection of welding wire or the parameter of welding rod 5 is according to treating
The thickness of welding workpiece 7 determines.The thickness of red copper bar is 20mm.Sealing device is encapsulated coil.The lower surface in bubble regulation and control portion 3
Uropore 32 is provided with, the size of uropore 32 is more than reinforcement caused by welding process, ensures that weld reinforcement will not be with bubble regulation and control portion 3
Lower surface contacts.
Embodiment two：
Step 1: brass bar endoporus to be machined into the shape to match with underwater wet method welding gun 2, fixed clamping is formed
Portion 1, fixed clamping portion 1 and underwater wet method welding gun 2 leave gap, and gap width is chosen for 1-2mm；
Step 2: opening up through hole 31 in the axle center of red copper bar, the diameter of through hole 31 is chosen for 1-5mm, by red copper bar lower surface
It is arranged to plane, ellipsoid or sphere, forms bubble regulation and control portion 3, fixed clamping portion 1 is connected with bubble regulation and control portion 3 by screw thread
Connect；
Step 3: underwater wet method welding gun 2 to be extend into the through hole in fixed clamping portion 1, welding wire or welding rod 5 penetrate bubble
The through hole 31 in regulation and control portion 3, the step surface of the through hole in fixed clamping portion 1 are sealed with underwater wet method welding gun 2 by sealing device；
Step 4, workpiece 7 to be welded is fixed with fixture, the lower surface in bubble regulation and control portion 3 and the upper surface of workpiece 7 to be welded
Distance be arranged to 1-15mm so that the distance of the bottom of ignition tip 8 to the upper surface of workpiece 7 to be welded is 30mm；
Step 5, welding current 300A, arc voltage 40V, speed of welding 600mm/min are chosen, carries out underwater wet method weldering
Connect.
In the present embodiment, workpiece 7 to be welded is steel plate, further, steel plate be ordinary low-carbon steel, low-alloy steel either
Stainless steel.A diameter of 1.0-1.6mm of welding wire, a diameter of 3.2mm of welding rod.The selection of welding wire or the parameter of welding rod 5 is according to treating
The thickness of welding workpiece 7 determines.The thickness of red copper bar is 60mm.Sealing device is encapsulated coil.The lower surface in bubble regulation and control portion 3
Uropore 32 is provided with, the size of uropore 32 is more than reinforcement caused by welding process, ensures that weld reinforcement will not be with bubble regulation and control portion 3
Lower surface contacts.
To sum up, underwater wet welding bubble regulation device of the invention, the welding point of underwater wet welding is enabled to
Quality advance, and it is simple in construction, processing cost is low, simple to operate, and strong adaptability is easy to spread.
For those skilled in the art it is easily understood that on the premise of not conflicting, above-mentioned each preferred scheme can be free
Ground combination, superposition.
The preferred embodiments of the present invention are these are only, are not intended to limit the invention, to those skilled in the art,
The present invention can have various changes and change.All any modifications made within spirit and principles of the present invention, equivalent substitution,
Improve etc., it should be included in the scope of the protection.
Claims (10)
1. a kind of underwater wet welding bubble regulation device, it is characterised in that fixation clamping portion and bubble including interconnection
Regulation and control portion, is provided with the fixed part for fixing underwater wet method welding gun in the fixed clamping portion, and the bubble regulation and control portion is set
Through hole is equipped with, the through hole is used to be used to regulate and control arc bubble through welding wire or welding rod, the lower surface in the bubble regulation and control portion
Diffusion, the welding ends of the welding wire or welding rod is exposed to the downside of the lower surface in the bubble regulation and control portion.
2. underwater wet welding bubble regulation device according to claim 1, it is characterised in that the bubble regulation and control portion
Lower surface is plane or inner concave.
3. underwater wet welding bubble regulation device according to claim 2, it is characterised in that the inner concave is sphere
Or ellipsoid.
4. underwater wet welding bubble regulation device according to claim 1, it is characterised in that the fixed part is setting
Through hole in the fixed clamping portion, location structure is provided with the through hole, and the location structure is used for described
Underwater wet method welding gun is positioned.
5. underwater wet welding bubble regulation device according to claim 4, it is characterised in that the through hole includes rank
Terraced hole, the shoulder hole include enlarged diameter section and reduced diameter section, and platform is formed in the junction of the enlarged diameter section and reduced diameter section
Terrace, the step surface form location structure.
6. underwater wet welding bubble regulation device according to claim 5, it is characterised in that set on the step surface
Seal is equipped with, for the sealing to the gap between the through hole and underwater wet method welding gun.
7. underwater wet welding bubble regulation device according to claim 4, it is characterised in that the through hole and underwater
There is gap between wet method welding gun；Preferably, between the minimum between the outer wall of the inwall of the through hole and underwater wet method welding gun
Gap is 1-2mm.
8. the underwater wet welding bubble regulation device according to one of claim 1-7, it is characterised in that in the bubble
Uropore is radially arranged along the through hole on the lower surface in regulation and control portion, for accommodating the weld seam formed in welding process.
9. underwater wet welding bubble regulation device according to claim 8, it is characterised in that the cross section of the uropore
Size be more than the weld seam reinforcement.
10. the underwater wet welding bubble regulation device according to one of claim 1-7, it is characterised in that the bubble
The material in regulation and control portion is red copper.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711041781.9A CN107775162A (en) | 2017-10-31 | 2017-10-31 | Underwater wet welding bubble regulation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711041781.9A CN107775162A (en) | 2017-10-31 | 2017-10-31 | Underwater wet welding bubble regulation device |
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| CN107775162A true CN107775162A (en) | 2018-03-09 |
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ID=61432166
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| CN108817618A (en) * | 2018-06-27 | 2018-11-16 | 山东大学 | A kind of underwater wet welding device that can adaptively regulate and control bubble and technique |
| CN108971717A (en) * | 2018-09-17 | 2018-12-11 | 山东船舶技术研究院 | A kind of the electric arc air bag auxiliary steady experimental device and its application method of wet process welding |
| CN111014912A (en) * | 2019-12-25 | 2020-04-17 | 广州市市政集团有限公司 | Bubble eliminating device for underwater wet welding |
| CN112114033A (en) * | 2020-07-23 | 2020-12-22 | 华东交通大学 | Experiment platform and method for researching evolution of underwater wet welding bubbles |
| CN112439969A (en) * | 2019-09-04 | 2021-03-05 | 哈尔滨工业大学（威海） | Screen mesh type double-wire double-pulse underwater wet welding device and method |
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| CN112439969A (en) * | 2019-09-04 | 2021-03-05 | 哈尔滨工业大学（威海） | Screen mesh type double-wire double-pulse underwater wet welding device and method |
| CN111014912A (en) * | 2019-12-25 | 2020-04-17 | 广州市市政集团有限公司 | Bubble eliminating device for underwater wet welding |
| CN112114033A (en) * | 2020-07-23 | 2020-12-22 | 华东交通大学 | Experiment platform and method for researching evolution of underwater wet welding bubbles |
| CN112114033B (en) * | 2020-07-23 | 2024-03-08 | 华东交通大学 | Experimental platform and method for researching evolution of underwater wet welding bubbles |
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Application publication date: 20180309 |