CN108817622A - Ultrasonic electric arc fitting rolling thin-wall steel tube welder and welding method - Google Patents
Ultrasonic electric arc fitting rolling thin-wall steel tube welder and welding method Download PDFInfo
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- CN108817622A CN108817622A CN201810913444.2A CN201810913444A CN108817622A CN 108817622 A CN108817622 A CN 108817622A CN 201810913444 A CN201810913444 A CN 201810913444A CN 108817622 A CN108817622 A CN 108817622A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 91
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- 238000003466 welding Methods 0.000 title claims abstract description 89
- 238000010891 electric arc Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 30
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- 238000002604 ultrasonography Methods 0.000 claims description 25
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- 238000007670 refining Methods 0.000 description 3
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- 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
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- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention belongs to welding procedure field, disclosing a kind of ultrasonic electric arc fitting rolling thin-wall steel tube welder and welding method, the device includes ultrasonic arc generating device and rolling laminating apparatus；Upper rolling laminating wheel (5.1) zero clearance is jointly mounted to thin-wall steel tube outside wall surface, and upper rolling laminating wheel (5.1) the radian curvature matches with thin-wall steel tube outside diameter；Lower rolling laminating wheel (5.2) zero clearance is jointly mounted to thin-wall steel tube inner wall, and lower rolling laminating wheel (5.2) the radian curvature matches with thin-wall steel tube inside diameter；The upper rolling laminating wheel (5.1) is corresponding with lower rolling laminating wheel (5.2) position.Ultrasonic electric arc is introduced into welding pool by ultrasonic arcing device；Rolling laminating wheel is bonded rolling with steel pipe gapless up and down, can make steel pipe seam crystal grain refinement, increase the ductility of weld seam, reduce tearing tendency in subsequent drawing process.
Description
Technical field
The present invention relates to welding procedure fields, and in particular to it is a kind of ultrasound electric arc fitting rolling thin-wall steel tube welder and
Welding method.
Background technique
With continuously improving for welding technique, and emerging in large numbers for new material is welded, welded still pipe just gradually replaces seamless steel
Pipe, but in steel-pipe welding metallurgical process, be easy to appear weld seam slag inclusion, stomata, weld dimensions tissue coarse grains,
Weld seam residual tension is larger, occurs performance decline during causing welded still pipe during the drawing process or subsequent use or splits
The defects of line.The quality for how improving Steel Welded Joint, has been a hot spot of research, except the accurate manipulation for improving welding equipment
Property and control welding condition outside, scientific research personnel also always searches for other methods, such as add alterant, mechanical oscillation,
It is oscillated or vibrated electric arc etc..
During practical steel-pipe welding, the application of many methods is all subject to certain restrictions.For different base materials and weldering
Material is connect, the ingredient of alterant is difficult to determine；Using the method for mechanical oscillation and swing arc, appearance of weld control and application are real
It is larger to apply difficulty；Individually emitted using supersonic source, the method that ultrasound imports welding pool is difficult to apply in the welding process.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of ultrasonic electric arc fitting rolling thin-wall steel tube welder and
Welding method can make the weld seam of welding point obtain certain extension, reduce weld residual stress, refinement weld grain, greatly
The big intensity and plasticity for improving welding point, and then improve the drawing property of welding point, seamless steel pipe can be substituted substantially.
To reach above-mentioned purpose, the following technical solutions are proposed by the present invention：A kind of ultrasound electric arc fitting rolling thin-wall steel tube weldering
Connection device, including ultrasonic arc generating device and rolling laminating apparatus；The rolling laminating apparatus include upper rolling laminating wheel, under
Roll laminating wheel and connecting bracket；The upper rolling laminating wheel zero clearance is jointly mounted to thin-wall steel tube outside wall surface, and it is described on
Rolling fitting camber of wheels curvature matches with thin-wall steel tube outside diameter；The lower rolling laminating wheel zero clearance is jointly mounted to thin
Wall steel pipe inner wall face, and the lower rolling fitting camber of wheels curvature matches with thin-wall steel tube inside diameter；The upper rolling patch
It closes wheel and lower rolling laminating wheel position is corresponding；Laminating wheel is rolled in the connecting bracket first end connection, second end passes through thin
Wall steel duct simultaneously supports connection is lower to roll laminating wheel；
The direction of motion for defining the thin-wall steel tube is from right to left：The ultrasound arcing device includes argon tungsten-arc welding
Rifle, the tungsten argon arc welding gun and the upper rolling laminating wheel gap setting are on the outside of thin-wall steel tube, and the upper rolling fitting
The right side of tungsten argon arc welding gun is arranged in wheel.
Ultrasound arcing device of the invention is the pulse power that coupling is superimposed a kind of supersonic frequency on argon tungsten-arc welding power supply,
Moment excitation ultrasound frequency when each pulse is issued and closed, introduces welding pool by tungsten electrode argon-arc welding electric arc for ultrasonic wave
In；By being bonded with thin-wall steel tube gapless rolling effect occurs for rolling laminating apparatus, realizes that rolling laminating apparatus is welded just
It connects and completes continuous rolling on the weld seam of completion, guarantee smooth welded seam.
Further, the inside of thin-wall steel tube is set there are two lower rolling laminating wheel, and the upper rolling laminating wheel is bonded thin-walled
It is arranged under two in corresponding interior sidewall surface on the outside of steel pipe and rolls laminating wheel, it is thin that the lower rolling laminating wheel is bonded abutting respectively
Opposite wall surface on the inside of wall steel pipe, and described two lower rolling laminating wheels are not in contact with each other.
Further, the diameter of the rolling laminating wheel is d, 5mm < d < 20mm；The thin-wall steel tube internal diameter is D, D>
20mm。
Further, the ultrasonic arcing device further includes the source of welding current and ultrasonic action power supply, the source of welding current
Tungsten argon arc welding gun is connected with after ultrasonic action power sources in parallel coupling.
Further, the ultrasonic action power supply is a kind of pulse power of supersonic frequency, and each pulse is issued and closed
Moment excitation ultrasound frequency when closing.
Further, the waveform of the ultrasonic action power supply is exchange rectangular wave, pulse frequency 10-800kHz, pulse electricity
Flow 0-60A, voltage 20-60V.
Further, the tungsten argon arc welding gun and upper rolling laminating wheel center spacing are 30-60mm.
The invention also discloses the welding methods using above-mentioned ultrasonic electric arc fitting rolling thin-wall steel tube welder, including
Following steps：
Upper rolling laminating wheel is bonded by the first step by tungsten argon arc welding gun by sets requirement alignment welding starting spotweld
On the outside of thin-wall steel tube weld seam, it is fitted in connecting bracket by lower rolling laminating wheel across weld seam corresponding with upper rolling laminating wheel
On the inside of thin-wall steel tube weld seam；
Second step connects the source of welding current and ultrasonic action power supply, and the ultrasonic electric arc of generation is introduced into welding pool, butt welding
It connects molten bath to be stirred, along weld movement welding；
Third step continuously rolls rigid soldered weld seam using rolling laminating apparatus, make face of weld and
Inner surface matches with thin-wall steel tube curvature, smooth weld seam, forms seamless steel pipe.
The principle of the present invention is to first pass through ultrasonic electric arc to be stirred effect to molten bath, eliminates stomata and refines crystal grain, then
Heat affected area is continuously rolled by being bonded rolling wheel up and down, compression is introduced and goes forward side by side step refining crystal grain, both eliminated
Residual stress increases the ductility of weld seam again simultaneously, avoids that crackle occurs in subsequent drawing process.
Preferably, the pressure being applied on the rolling laminating wheel is 10MPa~400MPa.
The present invention has the advantages that：The present invention can make the weld seam of welding point obtain certain extension, can
Weld residual stress is reduced, while weld grain can be refined, substantially increases the intensity and plasticity of welding point, and then improve
The drawing property of welding point can substitute seamless steel pipe in certain occasion.The invention patent utilizes ultrasonic arcing device, guarantor
Pressure device and idler wheel laminating apparatus collective effect, realize during stainless steel thin slice prepares thin slice steel pipe weld grain refinement and
The distribution of weld metal zone even tissue.It is introduced directly into molten bath, molten bath crystallization process, the movement of liquid metal, control welding can be promoted
Crystallization process has the function of significantly refining crystal grain, improves material internal quality and performance, but ultrasonic arcing will lead to
Heat affected area expands, and therefore, then fitting rolling device is cooperated to carry out nip drum to the weld dimensions after ultrasonic electric arc, will pressed
Stress introduces weld dimensions, further refines the crystal grain of heat affected area, improves the tensile property of weld seam.The invention is special
Benefit can control the grain size of steel pipe seam, while can guarantee to be not in crackle in subsequent drawing process；And this
Ultrasonic electric arc is applied to thin-wall circular tube for the first time by patent of invention, and realizes that gapless continuously rolls for the first time using fitting rolling wheel.
Detailed description of the invention
Fig. 1 is the concrete structure diagram of the ultrasonic electric arc fitting rolling thin-wall steel tube welder of the present invention；
Fig. 2 is the location diagram of the upper and lower rolling laminating wheel of the present invention；
Fig. 3 is the installation diagram of the lower rolling laminating wheel of the present invention；
Fig. 4 is the weld seam metallurgical tissue picture using common argon tungsten-arc welding；
Fig. 5 is using the ultrasonic electric arc fitting rolling of the present invention treated weld seam metallurgical tissue picture.
Wherein, the specific meaning respectively marked is：1, the source of welding current；2, power supply is motivated by ultrasound；3, tungsten argon arc welding gun；4, thin
Wall steel pipe；5.1, upper rolling laminating wheel；5.2, lower rolling laminating wheel；5.3, connecting bracket.
Specific embodiment
In order to better understand the technical content of the present invention, special to lift specific embodiment and institute's accompanying drawings is cooperated to be described as follows.
Various aspects with reference to the accompanying drawings to describe the present invention in the disclosure, shown in the drawings of the embodiment of many explanations.
It is not intended to cover all aspects of the invention for embodiment of the disclosure.It should be appreciated that a variety of designs and reality presented hereinbefore
Those of apply example, and describe in more detail below design and embodiment can in many ways in any one come it is real
It applies, this is because conception and embodiment disclosed in this invention are not limited to any embodiment.In addition, disclosed by the invention one
A little aspects can be used alone, or otherwise any appropriately combined use with disclosed by the invention.
The invention patent is described further with reference to the accompanying drawings and examples.
Ultrasonic electric arc fitting rolling thin-wall steel tube welder of the invention and welding method, it is therefore intended that thin-wall steel tube weldering
The Tissue distribution of the smooth welded seam formed in termination process, crystal grain refinement, and weld metal zone is more uniform.
Embodiment 1
As shown in connection with fig. 1, ultrasonic electric arc fitting rolling thin-wall steel tube welder, including ultrasonic arc generating device and rolling
Press laminating apparatus.
As shown in connection with fig. 2, the rolling laminating apparatus includes upper rolling laminating wheel 5.1, lower rolling laminating wheel 5.2 and connection
Bracket 5.3；Upper rolling 5.1 zero clearance of laminating wheel is jointly mounted to the outside wall surface of thin-wall steel tube 4, and the upper rolling fitting
It takes turns 5.1 radian curvature and the outside diameter of thin-wall steel tube 4 matches；Lower 5.2 zero clearance of rolling laminating wheel is jointly mounted to
4 inner wall of thin-wall steel tube, and the lower 5.2 radian curvature of rolling laminating wheel matches with 4 inside diameter of thin-wall steel tube；On described
It rolls laminating wheel 5.1 and 5.2 positions of lower rolling laminating wheel is corresponding；Fitting is rolled in 5.3 first end of the connecting bracket connection
Wheel 5.1, second end pass through and roll laminating wheel 5.2 under support connection inside thin-wall steel tube 4.In some other embodiments, thin
The inside installation of wall steel pipe 4 is there are two lower rolling laminating wheel 5.2, and structure is as shown in figure 3, the upper rolling laminating wheel 5.1 is bonded
Laminating wheel 5.2 is rolled under setting two in the corresponding interior sidewall surface in 4 outside of thin-wall steel tube, the lower rolling laminating wheel 5.2 divides
The opposite wall surface in 4 inside of thin-wall steel tube Tie He not be abutted, and described two lower rolling laminating wheels 5.2 are not in contact with each other.
The ultrasound arcing device includes the source of welding current 1, ultrasonic action power supply 2 and tungsten argon arc welding gun 3, the welding
Power supply 1 and ultrasonic action 2 parallel coupled of power supply, the ultrasonic action power supply 2 is a kind of pulse power of supersonic frequency, each
Ultrasonic wave is passed through tungsten argon arc with 3 cooperating of tungsten argon arc welding gun by moment excitation ultrasound frequency when pulse is issued and closed
Weldering electric arc is introduced into welding pool, is stirred to molten bath, and stomata is eliminated, so that crystal grain refinement in the weld seam formed, is eliminated
Stomata Tissue distribution is uniform.
The direction of motion for defining the thin-wall steel tube 4 is from right to left：The tungsten argon arc welding gun 3 is pasted with the upper rolling
5.1 gap settings of wheel are closed in 4 outside of thin-wall steel tube, and the right side of tungsten argon arc welding gun 3 is arranged in the upper rolling laminating wheel 5.1
Side.
Above-mentioned ultrasound electric arc fitting rolling thin-wall steel tube welding method, includes the following steps：
The first step, by tungsten argon arc welding gun 3 by sets requirement alignment welding starting spotweld, by upper rolling laminating wheel 5.1
It is fitted on the outside of thin-wall steel tube weld seam, so that connecting bracket 5.3 is passed through weld seam and be fitted in lower rolling laminating wheel 5.2 and upper rolling patch
It closes on the inside of the corresponding thin-wall steel tube weld seam of wheel 5.1；
Second step connects the source of welding current and ultrasonic action power supply, and the ultrasonic electric arc of generation is introduced into welding pool, butt welding
It connects molten bath to be stirred, along weld movement welding；
Third step continuously rolls rigid soldered weld seam using rolling laminating apparatus, is made on the outside of weld seam and interior
Side matches with thin-wall steel tube curvature, smooth weld seam, forms seamless steel pipe.
Further in conjunction with the embodiments 1, the diameter of the rolling laminating wheel is d, 5mm < d < 20mm；The thin-wall steel tube
Internal diameter is D, 20mm < D；The waveform of the ultrasonic action power supply 2 is exchange rectangular wave, pulse frequency 10-800kHz, pulse electricity
Flow 0-60A, voltage 20-60V；The pressure for being applied to the upper rolling laminating wheel 5.1 or lower rolling laminating wheel 5.2 is 10MPa
~400MPa；The tungsten argon arc welding gun 3 is 30-60mm with upper 5.1 center spacing of rolling laminating wheel.
The present invention can be used for handling the welding point that plate thickness is less than or equal to 3mm, and shaping steel tube diameter is greater than rolling
Pinch roller diameter (5-20mm).
Embodiment 2
The invention patent can improve welded still pipe weld defect, reduce subsequent drawing process cracking probability.In order to illustrate
The invention patent welded still pipe treatment effect, the 2507 two-way stainless steels for selecting in embodiment 2 species abundance in Baosteel in Shanghai to provide are as test
Use base material.
1) selection of raw material
Steel band is shown in Tables 1 and 2 having a size of 2000mm × 60mm × 1mm, main chemical compositions and mechanical property：
The chemical component (wt.%) of 1 steel band of table
2 steel band mechanical property of table
2) Welding Method & Equipment are chosen
Docking is rolled from melting welding with having a size of 2000mm × 60mm × 1mm steel band, first removes steel strip surface with acetone
Greasy dirt guarantees that the area to be welded before welding starts does not have pollutant.Test is more using TPS4000 digitlization argon arc welding/soldering
Function welding equipment carries out, and tungsten electrode end grinder buffing is at hemispherical, diameter 2.5mm, nozzle diameter 7mm, electric arc height
4mm。
3) welding point is handled
Steel pipe seam is welded according to the method for embodiment 1, molten bath is stirred by ultrasonic using ultrasonic electric arc, and
Rolling wheel is bonded continuously to be rolled.Welding current 110A, arc voltage 22V, frequency 50kHz, rolling power are 120MPa,
Speed of welding 2mm/s.
4) structure and performance characterization
Fig. 4 is common tungsten electrode argon-arc welding seam metallurgical tissue picture, and Fig. 5 is that treated using ultrasonic electric arc fitting rolling
Weld seam metallurgical tissue picture is basically unchanged through the soldered welding point fusion penetration of the invention patent as seen from the figure, overheat
Sector width narrows, and molten wide increases, and mainly since the presence of exciting current can increase the heat input of welding arc to a certain degree, surpasses
The high-frequency vibration that sound wave generates accelerates the heat transfer of heat affected area, so that overheated zone is in the time in higher temperature section gradually
It shortens, this has a very big significance the mechanical property for improving welding point.
Discovery is further looked to steel pipe seam metallographic structure, the weld seam metallographic structure through the invention patent welding is more
Refinement is distributed more uniform.Mainly since ultrasonic electric arc is to improving molten bath primary crystallization, eliminate stomata, be mingled with and crystallization is split
Line is more more effective than simple mechanical oscillation.Subsequent fitting rolling further can continuously roll weld seam again simultaneously, draw
Enter compression, coupling with ultrasonic vibration can crystallize or crystallized metal bears the alternate stress of tension and compression, be broken to
Long crystal grain changes crystal habit, really plays the role of refining crystal grain.
In conclusion steel band weld seam is after the fitting rolling of ultrasonic electric arc, the crystal grain of weld dimensions is obviously refined, and
And the Tissue distribution of weld metal zone more becomes to homogenizing.The weld seam welding method of the invention patent can reduce welding seams of round pipe to heat input
Sensibility, and weld seam is made to remain to that there is good impact flexibility under the conditions of higher thermal weld stress, especially can significantly mentioned
The low-temperature impact toughness of high steel pipe seam.Rolling acts on the residual stress distribution that can improve steel pipe seam and its peripheral region,
It is set to be evenly distributed, amplitude of variation reduces.
Although the present invention has been disclosed as a preferred embodiment, however, it is not to limit the invention.Skill belonging to the present invention
Has usually intellectual in art field, without departing from the spirit and scope of the present invention, when can be used for a variety of modifications and variations.Cause
This, the scope of protection of the present invention is defined by those of the claims.
Claims (9)
1. a kind of ultrasound electric arc fitting rolling thin-wall steel tube welder, including ultrasonic arc generating device, the ultrasound electric arc
Device includes tungsten argon arc welding gun (3), which is characterized in that further includes rolling laminating apparatus；
The rolling laminating apparatus includes upper rolling laminating wheel (5.1), lower rolling laminating wheel (5.2) and connecting bracket (5.3)；Institute
It states rolling laminating wheel (5.1) zero clearance and is jointly mounted to thin-wall steel tube outside wall surface, and upper rolling laminating wheel (5.1) radian
Curvature matches with thin-wall steel tube outside diameter；Lower rolling laminating wheel (5.2) zero clearance is jointly mounted in thin-wall steel tube
Wall surface, and lower rolling laminating wheel (5.2) the radian curvature matches with thin-wall steel tube inside diameter；The upper rolling laminating wheel
(5.1) corresponding with lower rolling laminating wheel (5.2) position；
Laminating wheel (5.1) are rolled in connecting bracket (5.3) the first end connection, second end is passed through inside thin-wall steel tube and supported
Connection is lower to roll laminating wheel (5.2)；
The direction of motion for defining the thin-wall steel tube is from right to left：The tungsten argon arc welding gun (3) is bonded with the upper rolling
(5.1) gap setting is taken turns on the outside of thin-wall steel tube, and upper rolling laminating wheel (5.1) is arranged in tungsten argon arc welding gun (3)
Right side.
2. ultrasound electric arc fitting rolling thin-wall steel tube welder according to claim 1, which is characterized in that thin-wall steel tube
Inside set there are two lower rolling laminating wheel (5.2), the upper rolling laminating wheel (5.1) is bonded corresponding on the outside of thin-wall steel tube
It is arranged under two in interior sidewall surface and rolls laminating wheel (5.2), the lower rolling laminating wheel (5.2) is bonded respectively abuts thin-wall steel tube
The opposite wall surface in inside, and described two lower rolling laminating wheels (5.2) are not in contact with each other.
3. ultrasound electric arc fitting rolling thin-wall steel tube welder according to claim 1, which is characterized in that the rolling
The diameter of laminating wheel is d, 5mm < d < 20mm；The thin-wall steel tube internal diameter is D, D>20mm.
4. ultrasound electric arc fitting rolling thin-wall steel tube welder according to claim 1, which is characterized in that the ultrasound
Arcing device further includes the source of welding current (1) and power supply (2) is motivated by ultrasound, the source of welding current (1) and ultrasonic action power supply (2)
Tungsten argon arc welding gun (3) are connected after parallel coupled.
5. ultrasound electric arc fitting rolling thin-wall steel tube welder according to claim 4, which is characterized in that described is super
Acoustically-driven power supply (2) is a kind of pulse power of supersonic frequency, moment excitation ultrasound frequency when each pulse is issued and closed.
6. ultrasound electric arc fitting rolling thin-wall steel tube welder according to claim 5, which is characterized in that the ultrasound
The waveform of excitation power supply (2) is exchange rectangular wave, pulse frequency 10-800kHz, pulse current 0-60A, voltage 20-60V.
7. ultrasound electric arc fitting rolling thin-wall steel tube welder according to claim 1, which is characterized in that the tungsten electrode
Argon-arc welding gun (3) and upper rolling laminating wheel (5.1) center spacing are 30-60mm.
8. the welding method of ultrasound electric arc fitting rolling thin-wall steel tube welder according to claim 1-7,
It is characterized by comprising the following steps：
The first step, by tungsten argon arc welding gun (3) by sets requirement alignment welding starting spotweld, by upper rolling laminating wheel (5.1)
It is fitted on the outside of thin-wall steel tube weld seam, so that connecting bracket (5.3) is passed through weld seam and be fitted in lower rolling laminating wheel (5.2) and upper rolling
It presses on the inside of laminating wheel (5.1) corresponding thin-wall steel tube weld seam；
Second step connects the source of welding current and ultrasonic action power supply, and the ultrasonic electric arc of generation is introduced into welding pool, molten to welding
Pond is stirred, along weld movement welding；
Third step continuously rolls rigid soldered weld seam using rolling laminating apparatus, makes face of weld and interior table
Face matches with thin-wall steel tube curvature, smooth weld seam, forms seamless steel pipe.
9. the welding method of ultrasound electric arc fitting rolling thin-wall steel tube welder according to claim 8, feature exist
In the pressure being applied on the rolling laminating wheel is 10MPa~400MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810913444.2A CN108817622B (en) | 2018-08-13 | 2018-08-13 | Ultrasonic arc laminating and rolling thin-wall steel pipe welding device and welding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810913444.2A CN108817622B (en) | 2018-08-13 | 2018-08-13 | Ultrasonic arc laminating and rolling thin-wall steel pipe welding device and welding method |
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| CN108817622A true CN108817622A (en) | 2018-11-16 |
| CN108817622B CN108817622B (en) | 2020-11-24 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110539055A (en) * | 2019-08-16 | 2019-12-06 | 上海交通大学 | large-current high-frequency arbitrary waveform arc coupling ultrasonic energy field excitation device and method |
| CN112676680A (en) * | 2020-12-17 | 2021-04-20 | 河北星烁锯业股份有限公司 | Method for repairing circular saw blade crack by gas shielded welding |
| CN112756762A (en) * | 2021-01-21 | 2021-05-07 | 华中科技大学 | Method and device for improving performance of aluminum alloy welded joint based on in-situ rolling |
| WO2023004866A1 (en) * | 2021-07-28 | 2023-02-02 | 广东铭利达科技有限公司 | Ultrasonic arc-assisting welding apparatus |
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| CN110539055A (en) * | 2019-08-16 | 2019-12-06 | 上海交通大学 | large-current high-frequency arbitrary waveform arc coupling ultrasonic energy field excitation device and method |
| CN112676680A (en) * | 2020-12-17 | 2021-04-20 | 河北星烁锯业股份有限公司 | Method for repairing circular saw blade crack by gas shielded welding |
| CN112756762A (en) * | 2021-01-21 | 2021-05-07 | 华中科技大学 | Method and device for improving performance of aluminum alloy welded joint based on in-situ rolling |
| WO2023004866A1 (en) * | 2021-07-28 | 2023-02-02 | 广东铭利达科技有限公司 | Ultrasonic arc-assisting welding apparatus |
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