CN101972892A - Multifunctional friction welding table - Google Patents
Multifunctional friction welding table Download PDFInfo
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- CN101972892A CN101972892A CN 201010527614 CN201010527614A CN101972892A CN 101972892 A CN101972892 A CN 101972892A CN 201010527614 CN201010527614 CN 201010527614 CN 201010527614 A CN201010527614 A CN 201010527614A CN 101972892 A CN101972892 A CN 101972892A
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Abstract
The invention discloses a multifunctional friction welding table, which is used for solving the technical problem that the traditional friction welding machine has low working efficiency since different friction welding methods cannot be performed on one machine. The technical scheme is characterized in that a main shaft rotates, a hydraulic system provides longitudinal displacement, pressure and upsetting force, and continuous drive friction welding is carried out by a clutch brake assembly, a shaft coupler, a first separation board and a welding piece clamping end assembly; the main shaft rotates and the hydraulic system provides longitudinal displacement, pressure and upsetting force, a flywheel disc stores rotation inertia, and inertia friction welding is carried out by using the clutch brake assembly, the shaft coupler, the first separation board and the welding piece clamping end assembly; and the main shaft rotates to drive a stirring head tool to rotate at a high speed, the hydraulic system provides longitudinal displacement and pressure, the work table provides horizontal displacement and speed control to carry out stirring friction welding by using the shaft coupler, the first separation board and the welding piece clamping end assembly; and because the different friction welding methods are realized on one friction welding table, the work efficiency is improved.
Description
Technical field
The present invention relates to a kind of friction welding platform, particularly a kind of multi-functional friction welding platform.
Background technology
Friction welding (FW) be a kind of be the modern metal solid phase thermocompression bonding method of thermal source with the frictional heat, promptly the faying face of two kinds of weldments is made relative high-speed motion, make contact portion reach mecystasis by means of frictional heat, more a kind of process that links into an integrated entity through pressurization.It is one and is comprising the extremely interactional complex process of heat, power, metallurgy, mass transfer.Friction welding method is with its stable technical process, welding quality height, solderability, production efficiency height, with low cost widely, and is widely used in branchs of industry such as high-tech sectors such as Aeronautics and Astronautics, nuclear energy, ocean development and electric power, machine-building, oil drilling, automobile making.
With reference to Fig. 2, document " welding engineer's handbook, Chen Zhunian, 2002, China Machine Press " a kind of Continuous Drive Friction Welding machine disclosed, this Continuous Drive Friction Welding machine comprises motor 1, clutch 12, weldment bare terminal end 8, main shaft 4, brake block 11 and hydraulic system 10, motor 1 level is installed, motor 1 is connected by the end of clutch 12 with weldment bare terminal end 8, be fixed with brake block 11 on the axle of clutch 12 and weldment bare terminal end 8, hydraulic system 10 is connected with the other end of weldment bare terminal end 8.Except the Continuous Drive Friction Welding machine, also has friction stir welding machine, inertia friction welder.The friction welding (FW) of distinct methods needs different friction-welding machines, causes the inconvenience of work, and operating efficiency is not high.
Summary of the invention
On a machine, can not carry out the welding of differentiated friction soldering method and cause ineffective deficiency in order to overcome existing friction-welding machine, the invention provides a kind of multi-functional friction welding platform.By the driven by motor main axis rotation, hydraulic system provides length travel, pressure and upset force, and clutch brake braking combination realizes clutch and brake, and shaft coupling, first dividing plate, weldment bare terminal end combination action can realize Continuous Drive Friction Welding; By the driven by motor main axis rotation, hydraulic system provides length travel, pressure and upset force, and clutch brake braking combination realizes clutch and brake, Flywheel disc stores rotary inertia, shaft coupling, first dividing plate, weldment bare terminal end combination action can realize flywheel friction welding; By the driven by motor main axis rotation, drive the stirring-head instrument and rotate at a high speed, hydraulic system provides length travel and pressure, and workbench provides horizontal displacement and speed control, and shaft coupling, first dividing plate, weldment bare terminal end combination action can realize friction stir welding; Like this, on a friction welding platform, can realize the friction welding of distinct methods, can increase work efficiency.
The technical solution adopted for the present invention to solve the technical problems: a kind of multi-functional friction welding platform, comprise motor 1, main shaft 4, weldment bare terminal end 8 and hydraulic system 10, it is characterized in that: also comprise clutch brake braking combination 2, portal frame 3, shaft coupling 5, first dividing plate 6, Flywheel disc 7, workbench 9, base plate 13 and second partition 14, whole multi-functional friction welding platform is fixed on the portal frame 3, first dividing plate 6 and second partition 14 all are connected on the support of portal frame 3 both sides, described motor 1 is positioned at the top and perpendicular to the ground the laying of portal frame 3, motor shaft is towards the below, first dividing plate is for 6 times a Flywheel disc 7, one end of shaft coupling 5 passes the upper surface that first dividing plate 6 is fixed on Flywheel disc 7, the be connected upper end of weldment bare terminal end 8 of Flywheel disc 7 lower surfaces, the other end of shaft coupling 5 and main shaft 4 are connected, be clutch brake braking combination 2 between motor 1 and the main shaft 4, Flywheel disc 7 by clutch brake braking combination 2 realize with the combination of main shaft 4 with separate; The workbench 9 that is being connected on the second partition 14, workbench 9 has leading screw, and leading screw cooperates with hydraulic system 10, realizes the level of workbench 9 and vertically moves; The be connected lower end of weldment bare terminal end 8 of workbench 9 upper surfaces.
Described weldment bare terminal end 8 is one group of scroll chuck.
The invention has the beneficial effects as follows: because by the driven by motor main axis rotation, hydraulic system provides length travel, pressure and upset force, clutch brake braking combination realizes clutch and brake, and shaft coupling, first dividing plate, weldment bare terminal end combination action have realized Continuous Drive Friction Welding; By the driven by motor main axis rotation, hydraulic system provides length travel, pressure and upset force, and clutch brake braking combination realizes clutch and brake, Flywheel disc stores rotary inertia, shaft coupling, first dividing plate, weldment bare terminal end combination action has realized flywheel friction welding; By the driven by motor main axis rotation, drive the stirring-head instrument and rotate at a high speed, hydraulic system provides length travel and pressure, and workbench provides horizontal displacement and speed control, and shaft coupling, first dividing plate, weldment bare terminal end combination action have realized friction stir welding; Like this, on a friction welding platform, realize the friction welding of distinct methods, improved operating efficiency.
Below in conjunction with the drawings and specific embodiments the present invention is elaborated.
Description of drawings
Fig. 1 is the multi-functional friction welding platform of a present invention structural representation.
Fig. 2 is a background technology Continuous Drive Friction Welding machine structural representation.
Among the figure, 1-motor, 2-clutch brake braking combination, 3-portal frame, 4-main shaft, 5-shaft coupling, 6-first dividing plate, 7-Flywheel disc, 8-weldment bare terminal end, 9-workbench, 10-hydraulic system, 11-brake block, 12-clutch, 13-base plate, 14-second partition.
The specific embodiment
Following examples are with reference to Fig. 1.
Embodiment 1: a kind of multi-functional friction welding platform comprises motor 1, clutch brake braking combination 2, portal frame 3, main shaft 4, shaft coupling 5, first dividing plate 6, Flywheel disc 7, weldment bare terminal end 8, workbench 9, hydraulic system 10, base plate 13 and second partition 14.Whole multi-functional friction welding platform is fixed on the portal frame 3, first dividing plate 6 and second partition 14 all are connected on the support of portal frame 3 both sides, motor 1 is positioned at the top and perpendicular to the ground the laying of portal frame 3, motor shaft is towards the below, first dividing plate is for 6 times a Flywheel disc 7, one end of shaft coupling 5 passes the upper surface that first dividing plate 6 is fixed on Flywheel disc 7, the be connected upper end of weldment bare terminal end 8 of Flywheel disc 7 lower surfaces, the other end of shaft coupling 5 and main shaft 4 are connected, be clutch brake braking combination 2 between motor 1 and the main shaft 4, Flywheel disc 7 by clutch brake braking combination 2 realize with the combination of main shaft 4 with separate; The workbench 9 that is being connected on the second partition 14, workbench 9 has leading screw, and leading screw cooperates with hydraulic system 10, makes workbench 9 realization levels and vertically moves; The be connected lower end of weldment bare terminal end 8 of workbench 9 upper surfaces.Weldment bare terminal end 8 is one group of scroll chuck.
Embodiment 2: realize Continuous Drive Friction Welding on multi-functional friction welding platform.Welded piece adds respectively on the weldment bare terminal end 8 that is held in two ends up and down, open motor 1, drive electric machine main shaft 4 rotations and accelerate to desired speed, the round end workpiece keeps lengthwise position constant, primer fluid pressing system 10, the horizontal table 9 of band lead screw transmission is risen, make two workpiece move toward one another, end face contact and plastification under the effect of frictional force, start clutch brake braking combination 2, realize brake, and open the clutch in the clutch brake braking combination 2, increase axial compressive force by hydraulic system 10 and carry out upset, finish welding.
The Continuous Drive Friction Welding of carbon steel.The carbon steel end face to be connected of polishing cleaning Φ 20mm, added respectively on the weldment bare terminal end 8 that is held in two ends up and down by the weldering carbon steel work-piece, open motor 1, drive electric machine main shaft 4 rotations and accelerate to desired speed, the round end workpiece keeps lengthwise position constant, primer fluid pressing system 10, the horizontal table 9 of lead screw transmission is risen, make two workpiece move toward one another, end face contact and plastification under the effect of frictional force start clutch brake braking combination 2, realize brake, and open clutch brake and brake the clutch that makes up in 2, increase axial compressive forces by hydraulic system 10 and carry out upsets, finish welding.
After the connection, utilize ESEM that welding point microstructure pattern is observed, connect well, do not have any defective and cavity on the interface, through the test of butt joint hot strength, intensity is 350～375MPa.
Embodiment 3: realize flywheel friction welding on multi-functional friction welding platform.Welded piece adds respectively on the weldment bare terminal end 8 that is held in two ends up and down, open motor 1, drive electric machine main shaft 4 rotations, thereby make Flywheel disc 7 accelerate to desired speed, utilize clutch brake braking combination 2 that clutch is disconnected, make Flywheel disc 7 break away from main shaft 4, Flywheel disc 7 is being with the upper end workpiece to rotate freely, and primer fluid pressing system 10 rises the horizontal table 9 of lead screw transmission simultaneously, the lower end workpiece is depressed on the rotational workpieces of upper end, makes composition surface friction mutually under pressure; Along with the reduction of Flywheel disc 7 rotating speeds, the kinetic energy on the Flywheel disc 7 changes the required heat energy of welding into, increased axial compressive force by hydraulic system 10 and carry out upset before rotation stops, make the composition surface metal plastic deformation, after rotation stopped, upsetting force continued to keep certain hour, finishes welding.
The flywheel friction welding of 45# steel.The 45# steel end face to be connected of polishing cleaning Φ 20mm, the 45# rod iron of same diameter is added respectively on the weldment bare terminal end 8 that is held in two ends up and down, open motor 1, drive electric machine main shaft 4 rotations, thereby make Flywheel disc 7 accelerate to desired speed, utilize clutch brake braking combination 2 cut-off clutches, make Flywheel disc 7 break away from main shaft 4, Flywheel disc 7 is being with the upper end workpiece to rotate freely, while primer fluid pressing system 10, the horizontal table 9 of lead screw transmission is risen, the lower end workpiece is depressed on the rotational workpieces of upper end, make composition surface friction mutually under pressure; Along with the reduction of Flywheel disc 7 rotating speeds, the kinetic energy on the Flywheel disc 7 changes the required heat energy of welding into, applied axial compressive force by hydraulic system 10 and carry out upset before rotation stops, make the composition surface metal plastic deformation, after rotation stopped, upsetting force continued to keep certain hour, finishes welding.
After the connection, utilize ESEM that welding point microstructure pattern is observed, connect well, do not have any defective and cavity on the interface, through the test of butt joint hot strength, intensity is 435～500MPa.
Embodiment 4: realize friction stir welding on multi-functional friction welding platform.The stirring-head instrument add be held in the upper end weldment bare terminal end 8 on, with the soldered plate of same thickness side relative fixed on the horizontal table 9 of lead screw transmission; Open motor 1, drive electric machine main shaft 4 rotations, thereby drive the stirring-head instrument be fixed on weldment bare terminal end 8 and accelerate to desired speed, the primer fluid pressing system 10 then, the horizontal table 9 of lead screw transmission is risen and make the mixing needle gradual slow insert commissure to be welded and suitable volume under pressure is arranged; Steadily after the rotation, the horizontal table 9 that starts lead screw transmission at the uniform velocity moves horizontally, and realizes the agitating friction welding.
The friction stir welding of 1060 aluminium alloys and 1100 aluminium alloys.Polishing cleaning 1060 aluminium alloys and 1100 aluminium alloys side to be connected; The stirring-head instrument add be held in the upper end weldment bare terminal end 8 on, with the soldered plate of same thickness side relative fixed on the horizontal table 9 of lead screw transmission; Open motor 1, drive electric machine main shaft 4 rotations, thereby drive the stirring-head instrument be fixed on weldment bare terminal end 8 and accelerate to desired speed, the primer fluid pressing system 10 then, the horizontal table 9 of lead screw transmission is risen and make the mixing needle gradual slow insert commissure to be welded and suitable volume under pressure is arranged; Steadily after the rotation, the horizontal table 9 that starts lead screw transmission at the uniform velocity moves horizontally, and realizes the agitating friction welding.
After the connection, utilize ESEM that welding point microstructure pattern is observed, connect well, do not have any defective and cavity on the interface, through the 1060 aluminium alloys/1100 aluminium alloy hot strengths after connecting are tested, intensity is 89～105MPa.
Claims (2)
1. multi-functional friction welding platform, comprise motor (1), main shaft (4), weldment bare terminal end (8) and hydraulic system (10), it is characterized in that: also comprise clutch brake braking combination (2), portal frame (3), shaft coupling (5), first dividing plate (6), Flywheel disc (7), workbench (9), base plate (13) and second partition (14), whole multi-functional friction welding platform is fixed on the portal frame (3), first dividing plate (6) and second partition (14) all are connected on the support of portal frame (3) both sides, described motor (1) is positioned at the top and perpendicular to the ground the laying of portal frame (3), motor shaft is towards the below, under first dividing plate (6) Flywheel disc (7), one end of shaft coupling (5) passes the upper surface that first dividing plate (6) is fixed on Flywheel disc (7), the be connected upper end of weldment bare terminal end (8) of Flywheel disc (7) lower surface, the other end of shaft coupling (5) and main shaft (4) are connected, be clutch brake braking combination (2) between motor (1) and the main shaft (4), Flywheel disc 7 by clutch brake braking combination (2) realize with the combination of main shaft (4) with separate; The workbench (9) that is being connected on the second partition (14), workbench (9) has leading screw, and leading screw cooperates with hydraulic system (10), realizes the level of workbench (9) and vertically moves; The be connected lower end of weldment bare terminal end (8) of workbench (9) upper surface.
2. multi-functional friction welding platform according to claim 1 is characterized in that: described weldment bare terminal end (8) is one group of scroll chuck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010105276147A CN101972892B (en) | 2010-10-28 | 2010-10-28 | Multifunctional friction welding table |
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| CN2010105276147A CN101972892B (en) | 2010-10-28 | 2010-10-28 | Multifunctional friction welding table |
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| CN101972892A true CN101972892A (en) | 2011-02-16 |
| CN101972892B CN101972892B (en) | 2012-06-27 |
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| CN2010105276147A Expired - Fee Related CN101972892B (en) | 2010-10-28 | 2010-10-28 | Multifunctional friction welding table |
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Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103722287A (en) * | 2013-12-08 | 2014-04-16 | 无锡伊诺永利文化创意有限公司 | Welding device |
| CN104475963A (en) * | 2014-11-17 | 2015-04-01 | 宁波聚益工具有限公司 | Novel friction welding machine |
| CN104526153A (en) * | 2014-11-17 | 2015-04-22 | 宁波聚益工具有限公司 | Friction welding machine |
| CN105290605A (en) * | 2014-07-17 | 2016-02-03 | 王华裕 | Manufacturing method for fast lathe dog |
| CN106141418A (en) * | 2016-08-06 | 2016-11-23 | 姜海 | The flexible steel pipe agitating friction soldering set started and welding method |
| CN106141419A (en) * | 2016-08-06 | 2016-11-23 | 姜海 | Agitating friction soldering set and welding method |
| CN106141420A (en) * | 2016-08-06 | 2016-11-23 | 姜海 | Agitating friction soldering set based on pressure feedback and welding method |
| CN106141417A (en) * | 2016-08-06 | 2016-11-23 | 姜海 | Steel pipe agitating friction soldering set and welding method |
| CN106181019A (en) * | 2016-08-06 | 2016-12-07 | 姜海 | The flexible steel pipe agitating friction soldering set started based on pressure feedback and welding method |
| CN106238900A (en) * | 2016-08-06 | 2016-12-21 | 姜海 | The flexible agitating friction soldering set started and welding method |
| CN106238899A (en) * | 2016-08-06 | 2016-12-21 | 姜海 | Steel pipe agitating friction soldering set based on pressure feedback and welding method |
| CN106271024A (en) * | 2016-08-06 | 2017-01-04 | 姜海 | Steel pipe agitating friction soldering set based on pressure feedback and welding method |
| CN106984896A (en) * | 2017-05-17 | 2017-07-28 | 上海向涛机械有限公司 | A kind of multifunctional inertia friction-welding machine |
| CN107470775A (en) * | 2017-09-26 | 2017-12-15 | 深圳市宝利通电子有限公司 | Copper aluminium friction welding apparatuses |
| CN107530825A (en) * | 2015-12-28 | 2018-01-02 | 山崎马扎克公司 | Friction-stir engagement cutter and lathe |
| CN108098129A (en) * | 2016-11-25 | 2018-06-01 | 上海向涛机械有限公司 | Friction plug repair welding equipment |
| CN108227632A (en) * | 2016-12-21 | 2018-06-29 | 上海向涛机械有限公司 | Friction plug repair welding system |
| CN108637461A (en) * | 2018-07-12 | 2018-10-12 | 江苏锢邦智能装备有限公司 | A kind of inertia friction weld equipment |
| CN108637463A (en) * | 2018-07-12 | 2018-10-12 | 江苏锢邦智能装备有限公司 | A kind of multifunctional high speed friction welding machine |
| CN108746986A (en) * | 2018-06-19 | 2018-11-06 | 湖南文理学院 | A kind of friction welding apparatus for big thickness radar panel |
| CN108941881A (en) * | 2018-08-29 | 2018-12-07 | 上海锢维智能设备有限公司 | A kind of efficient hub welding device and method |
| CN110026673A (en) * | 2019-05-24 | 2019-07-19 | 宁夏吴忠市好运电焊机有限公司 | Using the industrial robot of friction welding (FW) spot welding soldering tip |
| CN110560883A (en) * | 2019-09-29 | 2019-12-13 | 淄博斗木机械科技有限公司 | Vertical friction welding machine |
| CN112475589A (en) * | 2021-01-04 | 2021-03-12 | 南京塞班奥商贸有限公司 | Landing gear emergency welding device of small multi-rotor aircraft |
| CN114738393A (en) * | 2022-03-11 | 2022-07-12 | 潍坊水发供水集团有限公司 | Self-engaging coupling and method of use |
| CN117102607A (en) * | 2023-10-25 | 2023-11-24 | 江苏旭凯自动化设备有限公司 | Welding method and welding equipment for heating wire of protector |
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| RO117521B1 (en) * | 1989-12-04 | 2002-04-30 | 23 August Intreprinderea | Friction welding machine |
| CN1872481A (en) * | 2006-06-23 | 2006-12-06 | 首都航天机械公司 | Friction welding installation |
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Cited By (32)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103722287A (en) * | 2013-12-08 | 2014-04-16 | 无锡伊诺永利文化创意有限公司 | Welding device |
| CN105290605A (en) * | 2014-07-17 | 2016-02-03 | 王华裕 | Manufacturing method for fast lathe dog |
| CN104475963A (en) * | 2014-11-17 | 2015-04-01 | 宁波聚益工具有限公司 | Novel friction welding machine |
| CN104526153A (en) * | 2014-11-17 | 2015-04-22 | 宁波聚益工具有限公司 | Friction welding machine |
| CN104526153B (en) * | 2014-11-17 | 2016-06-01 | 宁波聚益工具有限公司 | A kind of friction welding machine |
| CN107530825A (en) * | 2015-12-28 | 2018-01-02 | 山崎马扎克公司 | Friction-stir engagement cutter and lathe |
| CN107530825B (en) * | 2015-12-28 | 2018-12-11 | 山崎马扎克公司 | Friction-stir engagement cutter and lathe |
| US10835988B2 (en) | 2015-12-28 | 2020-11-17 | Yamazaki Mazak Corporation | Friction stir welding tool and machine tool |
| CN106141417A (en) * | 2016-08-06 | 2016-11-23 | 姜海 | Steel pipe agitating friction soldering set and welding method |
| CN106181019A (en) * | 2016-08-06 | 2016-12-07 | 姜海 | The flexible steel pipe agitating friction soldering set started based on pressure feedback and welding method |
| CN106238900A (en) * | 2016-08-06 | 2016-12-21 | 姜海 | The flexible agitating friction soldering set started and welding method |
| CN106238899A (en) * | 2016-08-06 | 2016-12-21 | 姜海 | Steel pipe agitating friction soldering set based on pressure feedback and welding method |
| CN106271024A (en) * | 2016-08-06 | 2017-01-04 | 姜海 | Steel pipe agitating friction soldering set based on pressure feedback and welding method |
| CN106141420A (en) * | 2016-08-06 | 2016-11-23 | 姜海 | Agitating friction soldering set based on pressure feedback and welding method |
| CN106141419A (en) * | 2016-08-06 | 2016-11-23 | 姜海 | Agitating friction soldering set and welding method |
| CN106141418A (en) * | 2016-08-06 | 2016-11-23 | 姜海 | The flexible steel pipe agitating friction soldering set started and welding method |
| CN108098129A (en) * | 2016-11-25 | 2018-06-01 | 上海向涛机械有限公司 | Friction plug repair welding equipment |
| CN108227632A (en) * | 2016-12-21 | 2018-06-29 | 上海向涛机械有限公司 | Friction plug repair welding system |
| CN106984896A (en) * | 2017-05-17 | 2017-07-28 | 上海向涛机械有限公司 | A kind of multifunctional inertia friction-welding machine |
| CN107470775A (en) * | 2017-09-26 | 2017-12-15 | 深圳市宝利通电子有限公司 | Copper aluminium friction welding apparatuses |
| CN108746986A (en) * | 2018-06-19 | 2018-11-06 | 湖南文理学院 | A kind of friction welding apparatus for big thickness radar panel |
| CN108637461A (en) * | 2018-07-12 | 2018-10-12 | 江苏锢邦智能装备有限公司 | A kind of inertia friction weld equipment |
| CN108637463A (en) * | 2018-07-12 | 2018-10-12 | 江苏锢邦智能装备有限公司 | A kind of multifunctional high speed friction welding machine |
| CN108941881A (en) * | 2018-08-29 | 2018-12-07 | 上海锢维智能设备有限公司 | A kind of efficient hub welding device and method |
| CN110026673A (en) * | 2019-05-24 | 2019-07-19 | 宁夏吴忠市好运电焊机有限公司 | Using the industrial robot of friction welding (FW) spot welding soldering tip |
| CN110026673B (en) * | 2019-05-24 | 2024-03-29 | 宁夏吴忠市好运电焊机有限公司 | Industrial robot using friction welding spot welding head |
| CN110560883A (en) * | 2019-09-29 | 2019-12-13 | 淄博斗木机械科技有限公司 | Vertical friction welding machine |
| CN110560883B (en) * | 2019-09-29 | 2023-09-22 | 淄博斗木机械科技有限公司 | Vertical friction welding machine |
| CN112475589A (en) * | 2021-01-04 | 2021-03-12 | 南京塞班奥商贸有限公司 | Landing gear emergency welding device of small multi-rotor aircraft |
| CN114738393A (en) * | 2022-03-11 | 2022-07-12 | 潍坊水发供水集团有限公司 | Self-engaging coupling and method of use |
| CN114738393B (en) * | 2022-03-11 | 2023-02-03 | 潍坊水发供水集团有限公司 | Self-engaging coupling and method of use |
| CN117102607A (en) * | 2023-10-25 | 2023-11-24 | 江苏旭凯自动化设备有限公司 | Welding method and welding equipment for heating wire of protector |
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| CN101972892B (en) | 2012-06-27 |
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