CN110369839B - Welding gun clamping device and method capable of realizing ultrasonic-arc hybrid welding and application - Google Patents
Welding gun clamping device and method capable of realizing ultrasonic-arc hybrid welding and application Download PDFInfo
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- CN110369839B CN110369839B CN201910610830.9A CN201910610830A CN110369839B CN 110369839 B CN110369839 B CN 110369839B CN 201910610830 A CN201910610830 A CN 201910610830A CN 110369839 B CN110369839 B CN 110369839B
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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
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
- B23K9/287—Supporting devices for electrode holders
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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
- B23K9/24—Features related to electrodes
- B23K9/28—Supporting devices for electrodes
- B23K9/30—Vibrating holders for electrodes
Abstract
The invention discloses a welding gun clamping device capable of realizing ultrasonic-electric arc welding, a method and application thereof, wherein the welding gun clamping device comprises a movable support, an ultrasonic vibration mechanism and a welding gun clamp; the ultrasonic vibration mechanism comprises an energy converter, an amplitude transformer and a digital display ultrasonic generator, wherein the digital display ultrasonic generator is connected with the energy converter, and the energy converter is connected with the amplitude transformer; the welding gun clamp comprises two clamping blocks, the middle part of each clamping block is provided with two amplitude adjusting holes, one side surface is provided with an inner three-section concave arc surface, the two clamping blocks are combined to form a welding gun clamping position hole and the amplitude adjusting holes on two sides of the welding gun clamping position hole, and the two clamping blocks are connected together through a screw; one clamping block is connected to the movable support (or automatic welding equipment), and the other clamping block is connected with the amplitude transformer; the welding guns with different types and sizes can be clamped by adjusting the distance between the two clamping blocks.
Description
Technical Field
The invention relates to the technical field of welding equipment, in particular to a welding gun clamping device capable of realizing ultrasonic-arc hybrid welding, a method and application.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The electric arc welding is the most widely applied welding method in welding production, has the advantages of low cost, flexible operation, wide application range and the like, but has the defects of small penetration capacity, low welding speed, easy occurrence of air holes and the like when aluminum alloy is welded. To address these problems, a great deal of improvement has been done by welders. Recently, researchers have introduced ultrasonic energy into the arc and the molten pool, and compressed the arc by ultrasonic waves to improve the flow state of molten pool metal, increase the penetration and suppress blowholes. The patent with application number 201410063336.2 discloses an integrated ultrasonic arc hybrid welding device which is used for improving the fusion depth capability, inhibiting pores and refining grains and has good effect, but the ultrasonic arc hybrid welding device with the ultrasonic vibration system integrated with a welding gun has larger overall size, complex structure and inconvenient assembly and disassembly. The patent with application number 201621314837.4 discloses a rolling type ultrasonic arc hybrid welding device, which generates high-frequency vibration to a workpiece to be welded in a welding process, refines welding seam crystal grains and reduces welding residual stress and deformation, but the high-frequency vibration device has a complex structure and large size, requires a large operation space and is limited in use flexibility.
Disclosure of Invention
The invention aims to realize the compounding of ultrasonic vibration energy and welding electric arc by utilizing an integrated design device of an amplitude transformer and a welding gun clamp, and in the welding process, the electric arc is in an ultrasonic vibration state by virtue of the ultrasonic vibration of the welding gun, so that the welding electric arc and the molten pool metal flowing state are improved, and the final aim of improving the welding efficiency and the welding joint quality is further realized.
The invention aims to provide a welding gun clamping device capable of realizing ultrasonic-arc hybrid welding, which has the following specific structure:
the welding gun clamping device capable of realizing ultrasonic-arc hybrid welding comprises an ultrasonic vibration mechanism and a welding gun clamp;
the ultrasonic vibration mechanism comprises an energy converter, an amplitude transformer and a digital display ultrasonic generator, wherein the digital display ultrasonic generator is connected with the energy converter, and the energy converter is connected with the amplitude transformer;
the welding gun fixture comprises two clamping blocks, two amplitude adjusting holes are formed in the middle of each clamping block, three sections of concave arc surfaces are formed in one side surface, a welding gun mounting hole and the amplitude adjusting holes in the two sides of the welding gun mounting hole are formed after the two clamping blocks are combined, and the two clamping blocks are connected together through screws; one clamping block is connected to the movable support or the automatic welding equipment, and the other clamping block is connected with the amplitude transformer; the welding guns with different types and sizes can be clamped by adjusting the distance between the two clamping blocks.
The welding gun clamping device capable of realizing ultrasonic-arc hybrid welding can be arranged on any automatic welding device or any simple movable support.
As a further technical scheme, the invention provides a movable bracket for mounting the welding gun clamping device. The movable support comprises a support rod, a movable sliding block mechanism, a fixed handle, a base and a movable wheel, the support rod is vertically fixed on the base, the movable sliding block mechanism is sleeved on the support rod, and the fixed handle is used for fixing the position of the movable sliding block mechanism; the bottom of the base is fixed with a movable wheel.
As a further technical scheme, the movable sliding block mechanism comprises an upper sliding block and a lower sliding block, the upper sliding block and the lower sliding block are connected together, and the positions of the upper sliding block and the lower sliding block are respectively fixed through a fixed handle; the vertical height of the movable sliding block mechanism and the welding gun is accurately fixed by the two fixed handles, and the welding gun is adjusted and fixed in the horizontal position direction by moving and locking the four movable wheels below the base in any direction on the horizontal plane.
As a further technical scheme, the lower sliding block is of a cantilever beam structure, and the clamping block is connected with the cantilever beam through a screw.
As a further technical scheme, the welding gun clamp can clamp welding guns of different types and sizes, the movable support can realize the adjustment and the fixation of any position direction on the horizontal plane of the welding gun through the movement of the movable wheel, and can also realize the accurate adjustment and the fixation of the welding gun within the height range of 60 cm-110 cm through the movement of the movable slide block mechanism in the vertical direction of the support rod.
As a further technical scheme, the concave arc surface comprises three sections which are connected in sequence, and the radius of the middle section is larger than that of the two side sections. The two clamping blocks are combined to form three holes, the middle big hole is used for installing a welding gun, and the two small holes distributed on the two sides of the hole are used for adjusting the ultrasonic amplitude.
The second invention of the present invention is to provide a method for welding with the welding gun holding device capable of realizing ultrasonic-arc hybrid welding and the moving bracket, which comprises the following steps:
and 6, after the welding test is finished, turning off a switch of the digital display ultrasonic generator.
The third purpose of the invention is to provide the application of the welding gun clamping device for ultrasonic-arc hybrid welding in aluminum alloy ultrasonic-pulse MIG hybrid welding. The pulse MIG electric arc shrinks due to the compounding of ultrasonic vibration energy, the size of a transition molten drop is reduced, a molten pool is stirred, the flowing of the molten pool and the floating of bubbles in the molten pool are promoted, the weld fusion width is reduced, the weld fusion depth is increased, the sensitivity of welding pores and cracks of aluminum alloy is reduced, weld grains are refined, and the like.
The technical scheme can show that the invention mainly has the following advantages:
1. by applying ultrasonic vibration energy to the welding gun clamp, the ultrasonic vibration energy can be effectively compounded into electric arcs, the electric arcs are compressed, the state of a molten pool is improved, the weld penetration is increased, welding air holes are removed, and the welding efficiency and the quality of a welding joint are improved.
2. The device system for assisting electric arc welding through ultrasonic vibration can be disassembled and assembled at present, is convenient to assemble and disassemble, is flexible to move, and realizes large-range position adjustment of each welding gun in the horizontal direction and the vertical height direction.
3. The welding gun fixture mechanism with special design can clamp various arc welding guns, including TIG, MIG, MAG, CMT, PAW and other arc welding guns, and can achieve the purpose of ultrasonic-arc hybrid welding.
4. In the welding process, the ultrasonic vibration mechanism enables the nozzle of the welding gun to be always in an ultrasonic vibration state, the pulse arc compounds ultrasonic vibration energy, the arc shrinks, the size of the transition molten drop is reduced, the molten pool is stirred, the flow of the molten pool and the floating of bubbles in the molten pool are promoted, and the shape and the size of the molten pool and the crystallization of liquid metal are influenced. Experiments prove that the method can improve the weld forming, reduce the weld fusion width, increase the weld fusion depth, reduce the aluminum alloy welding pores and cracks, refine weld grains and the like.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic view of the overall structure of a welding gun clamping device and a movable support for ultrasonic-arc hybrid welding;
FIG. 2 is a front view of a torch holding device for performing ultrasonic-arc hybrid welding;
FIG. 3 is a top view of a torch holding device for performing ultrasonic-arc hybrid welding;
FIG. 4 is a side view of a torch clamping device and sonotrode electrical connection port;
fig. 5, 6 and 7 are schematic views of the welding gun clamp.
FIG. 8 is a comparison of the arc shape and weld surface formation of an aluminum alloy ultrasonic-pulse MIG hybrid weld with a conventional pulse MIG weld using the torch clamp of the present invention. .
FIG. 9 is a macroscopic and microscopic structure of a cross section of a weld joint of a conventional pulse MIG welding of aluminum alloy;
FIG. 10 is a macroscopic and microscopic structure of a weld cross section of an aluminum alloy ultrasonic-pulse MIG hybrid welding performed by using the welding gun holding device of the present invention;
in the figure: 1 welding gun, 2 supporting rods, 3 moving slide block mechanisms, 4 fixed handles, 5 bases, 6 moving wheels, 7 transducers, 8 amplitude transformers, 9 welding gun clamps, 10 clamping blocks, 11 clamping blocks, 12 screws, 13 ultrasonic amplitude adjusting holes, 14 screws and 15 welding gun clamping position holes.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The terms "mounted", "connected", "fixed", and the like in the present invention are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As described in the background art, the prior art has disadvantages, and in order to solve the above technical problems, the present application provides a simple and easy-to-use welding gun holding device capable of performing ultrasonic-arc hybrid welding, which only needs to hold various existing welding guns (the welding gun for tungsten electrode argon arc welding needs to be changed into a metallic nozzle) to perform ultrasonic-arc hybrid welding, and which can be conveniently installed on various welding supports or automatic welding equipment without changing accessibility and operational flexibility of the existing welding gun. And can effectively and reliably shrink the electric arc, realize the high-frequency vibration of the molten pool, refine grains, eliminate air holes and improve the penetration capability. After long-term research and practice of the inventor, the device can completely realize the purpose of ultrasonic-arc hybrid welding.
In an exemplary embodiment of the present application, fig. 1 is a schematic diagram illustrating an overall structure of a welding gun holding device and a movable support for performing ultrasonic-arc hybrid welding; the ultrasonic-arc hybrid welding gun clamping device comprises an ultrasonic vibration mechanism and a welding gun clamp;
the ultrasonic vibration mechanism comprises an energy converter 7, an amplitude transformer 8 and a digital display ultrasonic generator, the digital display ultrasonic generator is connected with the energy converter, and the energy converter 7 is connected with the amplitude transformer 8;
the welding gun clamp 9 comprises clamping blocks 10 and clamping blocks 11, a large semicircular hole and two small semicircular holes are respectively formed in the two clamping blocks 10 and 11 and combined to form a mounting hole 15 of a welding gun, the two small holes in the two sides of the hole and the two holes in the middle of the clamping blocks 10 and 11 are used for adjusting ultrasonic amplitude, and effective vibration of the welding gun is guaranteed. The two clamping blocks 10 and 11 are connected together by two fastening screws 14; one side of the clamping block 10 is connected with the cantilever beam end part of the movable sliding block 3 of the movable support, and the side end of the other clamping block 11 is connected with the amplitude transformer 8; welding guns of different sizes can be clamped by adjusting the distance between the two clamping blocks 10, 11.
Furthermore, the transducer 7 and the amplitude transformer 8 are in interference fit through a shaft hole to realize permanent rigid connection, and then are connected to the digital display ultrasonic generator through a cable data line through an electrical connection port of the transducer 7, and parameter adjustment is carried out through a panel of the digital display ultrasonic generator to realize control of the ultrasonic vibration mechanism.
Further, the welding torch 1 is held by a welding torch holder 9. As shown in fig. 5, 6 and 7, the welding gun clamp comprises two adjustable clamping blocks 10 and 11 and four M8 screws 12 and 14, wherein the clamping block 11 is permanently connected with the amplitude transformer 8 through interference fit, the other clamping block is connected with the cantilever beam end of the movable slide block mechanism 3 of the movable support through two M8 screws 12, the other two M8 screws 14 realize the connection and fastening of the two clamping blocks, the connection surface between the two clamping blocks 10 and 11 is a specially designed three-segment arc structure, and welding guns 1 of different types and sizes can be clamped by adjusting the distance between the clamping blocks.
Further, the welding gun clamp 9 and a movable support jointly form the welding gun clamping and position adjusting system, and the movable support consists of a support rod 2, a movable sliding block mechanism 3, a fixed handle 4, a base 5 and four movable wheels 6;
the supporting rod 2 is vertically fixed on the base 5, the moving slide block mechanism 3 is sleeved on the supporting rod 2, and the fixed handle 4 is used for fixing the position of the moving slide block mechanism 3; four moving wheels 6 are fixed at the bottom of the base 5.
The movable sliding block mechanism 3 comprises an upper sliding block and a lower sliding block, the upper sliding block and the lower sliding block are connected together through a vertical bolt, the height between the upper sliding block and the lower sliding block is adjustable, and the positions of the upper sliding block and the lower sliding block are respectively fixed through a fixed handle 4; the vertical height of the movable sliding block mechanism 3 and the welding gun 1 is accurately fixed by two fixed handles 4, and the position of the welding gun 1 on the horizontal plane is adjusted and fixed by moving and locking four movable wheels 6 below a base 5 in any direction on the horizontal plane.
Furthermore, the designed welding gun clamp can clamp welding guns 1 of different types and sizes, the movable support can not only realize the adjustment and fixation of any position direction on the horizontal plane of the welding gun 1 through the movement of the movable support, but also realize the accurate adjustment and fixation within the height range of 60 cm-110 cm through the support rod 2 in the vertical direction. The direction and position adjustment of the welding gun in any horizontal plane is realized by four moving wheels 6 under the base 5.
The method mainly comprises the following implementation steps:
and 6, after the welding test is finished, turning off a switch of the digital display ultrasonic generator.
Specifically, the welding method is applied to the pulse MIG welding of aluminum alloy, the welding gun is clamped and fixed by the designed welding gun clamping device, and the clamping position of the welding gun nozzle is about 5cm away from the end part of the MIG welding gun nozzle. The test base material is aluminum alloy AA6061-T6, the test piece specification is 250mm multiplied by 50mm multiplied by 6mm, the welding wire is ER5183, and the pulse MIG welding is adopted to carry out the surfacing test on the aluminum alloy flat plate with the plate thickness of 6 mm. The testing equipment adopts a PUSE MIG-500 III type welding machine of Otorx in Shandong; the method mainly comprises the following steps:
And 2, fixing the weldment of the aluminum plate to be welded on the welding platform by using a fixture. And clamping and fixing the welding gun according to the implementation steps, and adjusting the horizontal and vertical positions of the welding gun. The welding gun is positioned at the middle point of the welding starting end of the weldment on the horizontal plane, and the vertical distance between the end part of the nozzle of the welding gun and the workpiece is about 12 mm. And erecting and adjusting a high-speed camera and a background laser light source, and shooting and collecting characteristics of welding arc, molten drop transition, molten pool flow and the like in real time in the welding process.
And 4, turning on a switch of the digital display ultrasonic generator, preliminarily debugging, and starting a welding test after the ultrasonic vibration frequency and the output power are stable.
And 5, after the aluminum alloy ultrasonic-pulse MIG welding test is finished, closing a switch of the digital display ultrasonic generator.
And 6, replacing the welding sample plate, and performing the traditional aluminum alloy pulse MIG welding test under the same welding parameters. And when the welding test is finished, the welding power supply is turned off.
And 7, cutting the weld cross section samples from the two groups of surfacing welding samples through wire cutting, polishing and corroding, and observing the penetration, pore cracks and microscopic grain structures of the weld cross section under a metallographic microscope. As can be seen from fig. 8, the surfacing weld of the conventional pulse MIG welding of the aluminum alloy is wider and has smaller residual height than the surfacing weld of the ultrasonic-pulse MIG welding of the aluminum alloy, and the collection of the welding process by the high-speed camera shows that the flow length of the molten pool of the ultrasonic-pulse MIG welding of the aluminum alloy is shorter, the arc width is narrower, the droplet transition mode is also converted from short circuit transition and droplet transition to droplet ejection transition, and the depth of the arc impact molten pool is deeper. It can be found from fig. 9 and fig. 10 that compared with the conventional pulse MIG weld cross section of the aluminum alloy, the fusion depth of the ultrasonic-pulse MIG weld of the aluminum alloy is significantly increased, the fusion width is narrowed, the residual height is slightly increased, the weld pores and weld cracks are significantly reduced, and the weld grains are greatly refined.
In the new method of aluminum alloy ultrasonic-pulse MIG welding, the ultrasonic vibration device makes the MIG welding gun nozzle always in ultrasonic vibration, the vibration energy is transferred to the electric arc through the nozzle, the pulse MIG electric arc shrinks due to the compounded ultrasonic vibration energy, the size of the transition molten drop is reduced, the molten pool is stirred, the flow of the molten pool and the floating of bubbles in the molten pool are promoted, and the shape and the size of the molten pool and the crystallization of liquid metal are influenced. The experiment proves that the method can improve the weld forming, reduce the weld fusion width, increase the weld fusion depth, reduce the aluminum alloy welding pores and cracks, refine weld grains and the like.
The foregoing is merely a simple illustrative description of the present invention and is not intended to limit the present invention, which may be appropriately modified and varied by those skilled in the art. It is stated that any simple variation, modification or equivalent substitution by a person skilled in the art, without any inventive step, falls within the scope of protection of the present invention, without leaving the core of the present invention.
Claims (8)
1. A welding gun clamping device capable of realizing ultrasonic-arc hybrid welding is characterized by comprising a movable support, an ultrasonic vibration mechanism and a welding gun clamp;
the ultrasonic vibration mechanism comprises an energy converter, an amplitude transformer and a digital display ultrasonic generator, wherein the digital display ultrasonic generator is connected with the energy converter, and the energy converter is connected with the amplitude transformer;
the welding gun fixture comprises two clamping blocks, two amplitude adjusting holes are formed in the middle of each clamping block, three sections of concave arc surfaces are formed in one side surface, a welding gun mounting hole and the amplitude adjusting holes in the two sides of the welding gun mounting hole are formed after the two clamping blocks are combined, and the two clamping blocks are connected together through screws; one clamping block is connected with the movable support or the welding gun support of the automatic welding equipment, and the other clamping block is connected with the amplitude transformer; the welding guns with different types and sizes can be clamped by adjusting the distance between the two clamping blocks.
2. A welding gun holding device capable of realizing ultrasonic-arc hybrid welding according to claim 1, characterized in that the movable support comprises a support rod, a movable slider mechanism, a fixed handle, a base and a movable wheel, the support rod is vertically fixed on the base, the movable slider mechanism is sleeved on the support rod, and the fixed handle is used for fixing the position of the movable slider mechanism; the bottom of the base is fixed with a movable wheel.
3. A welding gun holding device capable of realizing ultrasonic-arc hybrid welding according to claim 2, characterized in that the moving slide block mechanism comprises an upper slide block and a lower slide block, the upper slide block and the lower slide block are connected together, and the positions of the upper slide block and the lower slide block are respectively fixed through a fixed handle.
4. A welding gun holding device capable of realizing ultrasonic-arc hybrid welding according to claim 3, characterized in that the lower slide block is in a cantilever beam structure, and the holding block is connected with the cantilever beam through a screw.
5. A welding gun holding device capable of realizing ultrasonic-arc hybrid welding according to claim 1, characterized in that the concave arc surface comprises three sections, the three sections are connected in sequence, the radius of the middle section is largest, the radii of the two ends are small, the two holding blocks are combined to form three holes, the middle big hole is used for installing a welding gun, and the two small holes distributed on the two sides of the hole are used for adjusting the ultrasonic amplitude.
6. A torch holding device for performing ultrasonic-arc hybrid welding according to claim 1, wherein said torch holding device is permanently connected to the horn by interference fit.
7. The method for arc welding using the torch holding device for ultrasonic-arc hybrid welding according to any one of claims 1 to 6,
step 1, mounting an integral movable support;
step 2, clamping and fixing the welding gun by using a welding gun clamp, wherein the clamping and fixing position is a welding gun nozzle, the clamping position is away from the end part of the welding gun nozzle by a certain distance, and then, clamping and fixing the welding gun clamp for clamping the welding gun, the amplitude transformer and the ultrasonic transducer connected equipment at the end part of the cantilever beam of the movable sliding block mechanism;
step 3, moving the connecting welding gun to the horizontal position and direction required by the welding working platform by pushing the movable support, fixing the movable wheel, determining the vertical distance from the nozzle of the welding gun to the welding workpiece by adjusting the vertical position of the movable slide block mechanism, and fixing the vertical position of the welding gun by the fixed handle;
step 4, connecting a cable data line of an electrical connection port of the transducer to a digital display ultrasonic generator, adjusting the required ultrasonic output power and the required ultrasonic frequency, determining the required pulse time ratio, and finally, storing parameter settings;
step 5, debugging the transducer to ensure the normal work of the ultrasonic vibration mechanism, and then starting a welding test after the ultrasonic vibration mechanism starts to work normally;
and 6, after the welding test is finished, turning off the digital display ultrasonic generator.
8. Use of a torch holding device for ultrasonic-arc hybrid welding with the torch holding device according to any of claims 1-6 for ultrasonic-arc hybrid welding.
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| US2405761A (en) * | 1943-11-11 | 1946-08-13 | Simmie Walter Stewart | Electromagnetic vibrator |
| CN2571528Y (en) * | 2002-08-23 | 2003-09-10 | 汕头市金士达超声机器有限公司 | Mould head for ultrasonic wave welding |
| CN106346110B (en) * | 2016-11-29 | 2018-09-25 | 西南石油大学 | A kind of the novel welding device and its welding method of Ni-based multiple tube |
| CN106624401A (en) * | 2016-12-02 | 2017-05-10 | 广东省智能制造研究所 | Rolling type ultrasonic arc composite welding device |
| CN207563889U (en) * | 2017-12-13 | 2018-07-03 | 四川华冶电气有限公司 | A kind of weld assembly |
| CN108857112A (en) * | 2018-07-18 | 2018-11-23 | 佛山科学技术学院 | A kind of two dimensional ultrasonic vibration auxiliary fusion welding device and method |
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