CN103753018A - Rotary tower type batch laser shock welding device under vacuum environment - Google Patents
Rotary tower type batch laser shock welding device under vacuum environment Download PDFInfo
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- CN103753018A CN103753018A CN201310721622.9A CN201310721622A CN103753018A CN 103753018 A CN103753018 A CN 103753018A CN 201310721622 A CN201310721622 A CN 201310721622A CN 103753018 A CN103753018 A CN 103753018A
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/0823—Devices involving rotation of the workpiece
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/1224—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in vacuum
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention provides a rotary tower type batch laser shock welding device under a vacuum environment. The device comprises a computer control system, a laser generating system, a focusing lens cone, a vacuum system and a rotary tower type work platform. The laser generating system and the focusing lens cone form a laser source and a light path. The vacuum system comprises a vacuum chamber, a vacuum pump connected with an air pumping port of the vacuum chamber and a vacuum pump controller electrically connected with the vacuum pump, and a light transmitting hole is formed in the top face of the vacuum chamber. The rotary tower type work platform comprises a rotary base, a stepping motor driver connected with the rotary base, a rotary disc fixed on the rotary base and a plurality of clamps arranged on the rotary disc. The laser generating system, the vacuum pump controller and the stepping motor driver are electrically connected with a computer controlling system. By means of the device, small batch production of laser shock tiny connecting pieces under the vacuum environment is achieved, production efficiency is improved, effects of environment and manual operation on the welding quality are removed, and flexibility automatic inspection of laser shock welding process parameters is achieved.
Description
Technical field
The invention belongs to laser-impact welding field, rotary type tower mass laser-impact welder under especially a kind of vacuum environment.
Background technology
Laser-impact welding machine is the material solder technology under a kind of emerging high speed impact condition, its Fundamentals of Welding are similar to explosive welding, electromagnetic pulse welding, all to utilize two metallic plates with a suitable angle high velocity impact, in shock point position, the stress that impacts generation substantially exceeds the yield stress of metal, and the metal faying face of distortion can produce jet.Injection is propagated gradually along mating surface, has cleared up surperficial oxide layer, leaves two faying faces after clean, and the atom of faying face, under the effect of contact greatly, the combination of chemical bond and metallic bond has occurred, thereby reaches very high bonding strength.
It is relatively thin that laser-impact welding is generally used for size, generally in 200 microns or thinner material, general several millimeters of welding region diameter, can realize the spot welding between of the same race and foreign material, its advantage is not have heat affected area after welding, therefore, soldered material can keep even the performance higher than mother metal, it can be as melting at the remitted its fury at solder bond place or welding region because the residual stress existing causes the problems such as crackle, corrosion.In the patent Low-temperature laser spot impact welding without contact that this emerging high speed impact welding method is US8084710B2 at publication number, proposed first; in impact velocity, be greater than 100m/s and can realize of the same race and solid-state connection foreign material, paper with suitable angle of attack " Effect of laser shock forming on surface roughness of targets; Laser technology2007 " mentions atmospheric pressure under high speed impact condition and can produce very large resistance to microsheet, and then greatly affect the bonding strength of micro-connector, and this factor is not considered in existing research, therefore has defect.
Material solder technology under existing laser-impact condition, the patent that for example publication number is CN1792545A provides a kind of method and apparatus of preparing gradient material by laser impacting welding and patent Introduction that publication number is CN1757480A a kind of method and apparatus of laser blasting explosion type welding, all that plasma stock wave and the blast wave that utilizes laser to produce HTHP as a kind of absorbed layer of igniting medium induction meeting and explosive component drives compound plate to clash into substrate realization welding, Fundamentals of Welding are similar to explosive welding, be applied to macro-energy and compared with the welding of slab part more, and it is also inapplicable in the plate welding of 100 microns and following thickness for thickness.
Laser-impact solder technology is also different from general laser weld, the method and apparatus of a kind of self adaptive laser-impact welding that the patent that is CN103008886A as publication number provides, this invention is in order to improve the defects such as crackle that residual tension that laser weld stays causes, corrosion, reiforcing laser impact technology is applied in the process of laser weld, the strengthening of side weld edge fit, its Fundamentals of Welding are also different from high speed impact welding completely.
Laser-impact welding is as a kind of emerging high speed impact solder technology, a lot of technological parameters are angle of attack for example, imperfection is gone back in the research of flying distance etc., consider the impact that usually there will be environment and manual operation in experimentation, therefore a kind of automation equipment of probing into laser-impact welding condition seems particularly important; In addition, existing laser-impact welding is all single-piece welding, and efficiency is very low.
Summary of the invention
The object of the invention is to realize the small lot batch manufacture that under vacuum environment, laser-impact welds micro-connector, enhance productivity, the impact of the error of elimination environment and manual operation on the welding quality of microsheet, realizes the flexible automation check of laser-impact welding condition.
The present invention realizes above-mentioned technical purpose by following technological means.
Rotary type tower mass laser-impact welder under a kind of vacuum environment, comprise computer control system, laser generating system, focusing drawtube, vacuum system and rotary type tower workbench, described vacuum system comprises controller for vacuum pump, vavuum pump, vacuum chamber, described controller for vacuum pump and vavuum pump electrically connect, described vavuum pump is connected with the bleeding point of vacuum chamber, on the end face of vacuum chamber, is provided with light hole, described rotary type tower workbench comprises rotating base, the stepper motor driver being connected with rotating base, be fixed on the rotating disk on rotating base, be assemblied in a plurality of fixtures on rotating disk, rotating base is through the bottom surface of vacuum chamber, and coordinate with vacuum chamber sealing bottom surface, described laser generating system comprises laser controller, generating laser, described generating laser is connected with focusing drawtube by optical fiber, described focusing drawtube is arranged on the top of vacuum chamber light hole, and be connected with the end face of vacuum chamber, described laser controller, controller for vacuum pump, stepper motor driver all electrically connects with computer control system.
Preferably, described vacuum chamber is surrounded by vacuum cavity, the sealed base of the tubular structure of seal cover, both ends open, vacuum cavity is tightly connected by screw, sealing ring and sealed base, between described seal cover and vacuum cavity, by screw, sealing ring, is tightly connected; Described fixture is fixed on sealed base, and light hole is arranged on seal cover.
Preferably, described laser-impact welder also comprises securing bracket, three-dimensional mobile platform, three-dimensional mobile platform controller, described sealed base is fixed on three-dimensional mobile platform, three-dimensional mobile platform is controlled by three-dimensional mobile platform controller, and described three-dimensional mobile platform controller and computer control system electrically connect; Described securing bracket comprises support, supports swivel nut, circular cover, circular holddown plate, support is fixed on workbench, supporting swivel nut is fixed on support, cover is contained on support, by supporting swivel nut, supports, described vacuum cavity top is outwards placed in cover at outstanding edge, described holddown plate is placed on seal cover and is assemblied on support, and the first locking nut is housed on the support on holddown plate top.
Preferably, described a plurality of fixture is uniformly distributed on rotating disk, it is fixed by screws on rotating disk.
Preferably, between described rotating disk and rotating base, for being threaded, and fix by the second locking nut.
Preferably, vacuum vacuum chamber bottom surface and rotating base junction are provided with sealing ring and seal cover board.
Beneficial effect of the present invention is:
The first, can realize the small lot batch manufacture of laser-impact welding, improve production efficiency.In addition, can install and remove flexibly and change the requirement that weld jig is realized multiple productive experiment.
The second, eliminate the resistance of atmospheric pressure to ultra-thin compound plate material under high speed impact condition, greatly improved welding performance.
Three, can impact angle and the technological parameter such as flying distance welding performance impact is carried out to simple accurately effectively check, and be applied to that MEMS (MEMS) part is processed and the preparation of fine-scale composite provides the guidance of effective technological parameter for laser-impact solder technology.
Accompanying drawing explanation
Fig. 1 is the structure chart of rotary type tower mass laser-impact welder under vacuum environment of the present invention.
Fig. 2 is described rotary type tower workbench and vacuum tank sealed base assembling schematic diagram.
Fig. 3 is the axonometric drawing of described rotary type tower workbench.
Fig. 4 is the structural representation of described fixture.
Fig. 5 is the side view of described compound plate, pitch-dark layer and K9 glass.
Fig. 6 is the front view of described compound plate, pitch-dark layer and K9 glass.
Fig. 7 is the securing bracket schematic diagram of described fixedly vacuum tank.
Description of reference numerals is as follows:
1-computer control system, 2-laser controller, 3-generating laser, 4-optical fiber, 5-end cap, 6-focusing drawtube, 7-seal cover, 8-securing bracket, 801-support, 802-screw, 803-supports swivel nut, 804-cover, 805-holddown plate, 806-the first locking nut, 9-vacuum cavity, 10-fixture, 101-locks cover plate, 102-K9 glass, the pitch-dark layer of 103-, 104-compound plate, 105-holddown plate, 106-substrate, 107-clamp body, 11-the second locking nut, 12-rotating disk, 13-rotating base, 14-seal cover board, 15-sealed base, 16-three-dimensional mobile platform, 17-workbench, 18-controller for vacuum pump, 19-stepper motor driver, 20-three-dimensional mobile platform controller, 21-vavuum pump.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to this.
Figure 1 shows that an embodiment of rotary type tower mass laser-impact welder under vacuum environment of the present invention.Under described vacuum environment, rotary type tower mass laser-impact welder, comprises computer control system 1, laser generating system, focusing drawtube 6, vacuum system and rotary type tower workbench.
Described vacuum system provides vacuum environment for described laser-impact welder, eliminates the resistance of atmospheric pressure to ultra-thin compound plate material under high speed impact condition, improves welding performance.Described vacuum system comprises controller for vacuum pump 18, vavuum pump 21, vacuum chamber, and described controller for vacuum pump 18 electrically connects with vavuum pump 21, and described vavuum pump 21 is connected with the bleeding point of vacuum chamber.Described controller for vacuum pump 18 is bled and is exitted for controlling vavuum pump 21, and the air pressure in vacuum chamber.On the upper wall of vacuum chamber, be provided with light hole, for laser provides light path.Described laser generating system comprises laser controller 2, generating laser 3, and generating laser 3 produce powers are at the laser of 2J-10J, and laser controller 2 is adjusted for controlling 3 pairs of laser parameters of generating laser.Described generating laser 3 is connected with focusing drawtube 6 by optical fiber 4.Concrete, between described optical fiber 4 and focusing drawtube 6, being provided with end cap 5, described optical fiber 4 is connected with end cap 5, and described end cap 5 is fixed on focusing drawtube 6, and described end cap 5 is located by straight pin with the position of focusing drawtube 6.Described focusing drawtube 6 is arranged on the top of vacuum chamber light hole and is connected with the end face of vacuum chamber, and uses screw lock.Laser controller 2 is controlled generating laser 3 and is sent laser, through optical fiber 4 couplings, by focusing drawtube 6, light hole, is transmitted in vacuum chamber.Computer control system 1 is as human-computer interaction device, and described laser controller 2, controller for vacuum pump 18 all electrically connect with computer control system 1.Computer control system 1 is for controlling laser controller 2, controller for vacuum pump 18, and parameter is preserved.
As shown in Figure 3, described rotary type tower workbench comprises rotating base 13, stepper motor driver 19, rotating disk 12, a plurality of fixture 10.For being threaded, and fixing by the second locking nut 11 between described rotating disk 12 and rotating base 13; A plurality of fixtures 10 are uniformly distributed on rotating disk 12, it is fixed by screws on rotating disk 12, realize accurately location.As shown in Figure 2, rotating base 13 passes the bottom surface of vacuum chamber and coordinates with vacuum chamber sealing bottom surface; Preferably, vacuum vacuum chamber bottom surface and rotating base 13 junctions are provided with sealing ring and seal cover board 14.Stepper motor driver 19 is connected with rotating base 13, and under the driving of stepper motor driver 19, the rotating disk 12 of rotary type tower workbench, makes a plurality of fixtures 10 be positioned in turn princess position, carries out laser-impact welding.Described a plurality of fixture 10 is uniformly distributed on rotating disk 12, it is fixed by screws on rotating disk 12.
Pitch-dark layer 103 is coated in the not polishing region of compound plate 104 as shown in Figure 5, Figure 6, and water is cooked adhesive by compound plate 104 and K9 glass 102 close adhesion.Compound plate 104 and K9 glass 102 are placed on to the horizontal table part of clamp body 107, and compress with locking cover plate 101.Substrate 106 is placed on tilting table fixing with holddown plate 105, as shown in Figure 4.According to different production requirements, the angle of attack of fixture 10 there are differences.Therefore be assemblied on rotating disk 12 described fixture 10 is dismountable, be convenient for changing the fixture 10 with differing tilt angles.
As shown in Figure 1, in the present embodiment, described vacuum chamber is surrounded by vacuum cavity 9, the sealed base 15 of the tubular structure of seal cover 7, both ends open.Vacuum cavity 9 is tightly connected by screw, sealing ring and sealed base 15, between described seal cover 7 and vacuum cavity 9, by screw, sealing ring, is tightly connected; Described fixture 10 is fixed on sealed base 15, and light hole is arranged on seal cover 7.Seal cover 7, vacuum cavity 9 are supported by securing bracket 8, sealed base 15 is fixed on three-dimensional mobile platform 16, three-dimensional mobile platform 16 is controlled by three-dimensional mobile platform controller 20, and described three-dimensional mobile platform controller 20 electrically connects with computer control system 1.As shown in Figure 7, described securing bracket 8 comprises support 801, supports swivel nut 803, circular cover 804, circular holddown plate 805, support 801 is fixed on workbench 17 by screw 802, support swivel nut 803 is threaded connection and is assemblied on support 801, cover 804 is contained on support 801, by supporting swivel nut 803, supports, described vacuum cavity 9 tops are outwards placed in cover 804 at outstanding edge, described holddown plate 805 is placed on seal cover 7 and is assemblied on support 801, and the first locking nut 806 is housed on the support 801 on holddown plate 805 tops.By controlling the action of three-dimensional mobile platform 16, realize sealed base 15 with the separated of vacuum cavity 9 and close tight.
This described embodiment is preferred embodiment of the present invention; but invention is not limited to above-mentioned embodiment; in the situation that not deviating from flesh and blood of the present invention, any apparent improvement, replacement or modification that those skilled in the art can make all belong to protection scope of the present invention.
Claims (6)
1. rotary type tower mass laser-impact welder under a vacuum environment, it is characterized in that, comprise computer control system (1), laser generating system, focusing drawtube (6), vacuum system and rotary type tower workbench, described vacuum system comprises controller for vacuum pump (18), vavuum pump (21), vacuum chamber, described controller for vacuum pump (18) electrically connects with vavuum pump (21), described vavuum pump (21) is connected with the bleeding point of vacuum chamber, on the end face of vacuum chamber, is provided with light hole, described rotary type tower workbench comprises rotating base (13), the stepper motor driver (19) being connected with rotating base (13), be fixed on the rotating disk (12) on rotating base (13), be assemblied in a plurality of fixtures (10) on rotating disk (12), rotating base (13) is through the bottom surface of vacuum chamber, and coordinate with vacuum chamber sealing bottom surface, described laser generating system comprises laser controller (2), generating laser (3), described generating laser (3) is connected with focusing drawtube (6) by optical fiber (4), described focusing drawtube (6) is arranged on the top of vacuum chamber light hole, and be connected with the end face of vacuum chamber, described laser controller (2), controller for vacuum pump (18), stepper motor driver (19) all electrically connects with computer control system (1).
2. laser-impact welder according to claim 1, it is characterized in that, described vacuum chamber is surrounded by vacuum cavity (9), the sealed base (15) of the tubular structure of seal cover (7), both ends open, vacuum cavity (9) is tightly connected by screw, sealing ring and sealed base (15), between described seal cover (7) and vacuum cavity (9), by screw, sealing ring, is tightly connected; It is upper that described fixture (10) is fixed on sealed base (15), and light hole is arranged on seal cover (7).
3. laser-impact welder according to claim 1, it is characterized in that, also comprise securing bracket (8), three-dimensional mobile platform (16), three-dimensional mobile platform controller (20), described sealed base (15) is fixed on three-dimensional mobile platform (16), three-dimensional mobile platform (16) is controlled by three-dimensional mobile platform controller (20), and described three-dimensional mobile platform controller (20) electrically connects with computer control system (1), described securing bracket (8) comprises support (801), support swivel nut (803), circular cover (804), circular holddown plate (805), support (801) is fixed on workbench (17), supporting swivel nut (803) is fixed on support (801), cover (804) is contained on support (801), by supporting swivel nut (803), support, described vacuum cavity (9) top is outwards placed in cover (804) at outstanding edge, described holddown plate (805) is placed on seal cover (7), and be assemblied on support (801), on the support (801) on holddown plate (805) top, the first locking nut (806) is housed.
4. laser-impact welder according to claim 1, is characterized in that, on described a plurality of fixtures (10) are uniformly distributed on rotating disk (12), it is fixed by screws in rotating disk (12).
5. laser-impact welder according to claim 1, is characterized in that, for being threaded, and fixing by the second locking nut (11) between described rotating disk (12) and rotating base (13).
6. laser-impact welder according to claim 1, is characterized in that, vacuum vacuum chamber bottom surface and rotating base (13) junction is provided with sealing ring and seal cover board (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310721622.9A CN103753018B (en) | 2013-12-24 | 2013-12-24 | Rotary type tower mass laser-impact welder under a kind of vacuum environment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310721622.9A CN103753018B (en) | 2013-12-24 | 2013-12-24 | Rotary type tower mass laser-impact welder under a kind of vacuum environment |
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| CN103753018A true CN103753018A (en) | 2014-04-30 |
| CN103753018B CN103753018B (en) | 2015-10-28 |
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| CN201310721622.9A Expired - Fee Related CN103753018B (en) | 2013-12-24 | 2013-12-24 | Rotary type tower mass laser-impact welder under a kind of vacuum environment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105070957A (en) * | 2015-08-09 | 2015-11-18 | 宁夏绿聚能电源有限公司 | Laser welding device for packaging sodium-nickel battery anode chamber |
| CN105290613A (en) * | 2015-10-30 | 2016-02-03 | 武汉钢铁(集团)公司 | Vacuum welding device and method for preventing laser seam from generating pores |
| CN107580534A (en) * | 2015-04-08 | 2018-01-12 | 费尔索梅特有限及两合公司 | Method for the vacuum laser welding at least workpiece of two-part |
| CN108637470A (en) * | 2018-04-12 | 2018-10-12 | 江苏大学 | A kind of laser transmission welding system and method |
| CN109048029A (en) * | 2018-08-21 | 2018-12-21 | 江苏大学 | A kind of laser-impact pressure welding Automatic-clamping pick-off unit and its method |
| CN111558774A (en) * | 2020-07-20 | 2020-08-21 | 昆山联滔电子有限公司 | Relay welding device and welding method |
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| CN1374165A (en) * | 2001-10-19 | 2002-10-16 | 江苏大学 | Laser impact precision forming method and device |
| CN1757480A (en) * | 2005-08-31 | 2006-04-12 | 江苏大学 | Laser blasting explosion type welding method and apparatus |
| CN1827284A (en) * | 2006-04-13 | 2006-09-06 | 江苏大学 | Hole-forming method and device based on laser shock wave technology |
| US20110000953A1 (en) * | 2008-03-07 | 2011-01-06 | The Ohio State University | Low-temperature spot impact welding driven without contact |
| CN103008886A (en) * | 2012-12-28 | 2013-04-03 | 江苏大学 | Self-adaptive laser shock welding method and device |
-
2013
- 2013-12-24 CN CN201310721622.9A patent/CN103753018B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1374165A (en) * | 2001-10-19 | 2002-10-16 | 江苏大学 | Laser impact precision forming method and device |
| CN1757480A (en) * | 2005-08-31 | 2006-04-12 | 江苏大学 | Laser blasting explosion type welding method and apparatus |
| CN1827284A (en) * | 2006-04-13 | 2006-09-06 | 江苏大学 | Hole-forming method and device based on laser shock wave technology |
| US20110000953A1 (en) * | 2008-03-07 | 2011-01-06 | The Ohio State University | Low-temperature spot impact welding driven without contact |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107580534A (en) * | 2015-04-08 | 2018-01-12 | 费尔索梅特有限及两合公司 | Method for the vacuum laser welding at least workpiece of two-part |
| CN105070957A (en) * | 2015-08-09 | 2015-11-18 | 宁夏绿聚能电源有限公司 | Laser welding device for packaging sodium-nickel battery anode chamber |
| CN105290613A (en) * | 2015-10-30 | 2016-02-03 | 武汉钢铁(集团)公司 | Vacuum welding device and method for preventing laser seam from generating pores |
| CN105290613B (en) * | 2015-10-30 | 2017-05-17 | 武汉钢铁(集团)公司 | Vacuum welding device and method for preventing laser seam from generating pores |
| CN108637470A (en) * | 2018-04-12 | 2018-10-12 | 江苏大学 | A kind of laser transmission welding system and method |
| CN108637470B (en) * | 2018-04-12 | 2020-09-25 | 江苏大学 | Laser transmission welding system and method thereof |
| CN109048029A (en) * | 2018-08-21 | 2018-12-21 | 江苏大学 | A kind of laser-impact pressure welding Automatic-clamping pick-off unit and its method |
| CN109048029B (en) * | 2018-08-21 | 2020-07-31 | 江苏大学 | Automatic clamping and taking device and method for laser impact pressure welding |
| CN111558774A (en) * | 2020-07-20 | 2020-08-21 | 昆山联滔电子有限公司 | Relay welding device and welding method |
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| CN103753018B (en) | 2015-10-28 |
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