CN106271047B - A method of titanium-aluminum dissimilar metal is welded using femtosecond laser - Google Patents
A method of titanium-aluminum dissimilar metal is welded using femtosecond laser Download PDFInfo
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- CN106271047B CN106271047B CN201610809741.3A CN201610809741A CN106271047B CN 106271047 B CN106271047 B CN 106271047B CN 201610809741 A CN201610809741 A CN 201610809741A CN 106271047 B CN106271047 B CN 106271047B
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- Prior art keywords
- joint face
- workpiece
- welding
- titanium
- femtosecond laser
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
- B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
- B23K26/0624—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses using ultrashort pulses, i.e. pulses of 1ns or less
-
- 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
- B23K26/127—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an enclosure
-
- 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
- B23K26/21—Bonding by welding
- B23K26/24—Seam welding
-
- 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
- B23K26/60—Preliminary treatment
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/18—Dissimilar materials
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
Titanium-aluminum dissimilar metal method is welded using femtosecond laser the invention discloses a kind of, includes the following steps: to be processed into titanium, aluminum metallic material to identical two workpiece of joint face；It treats connection workpiece to be pre-processed and finished, so that the surface roughness Ra to joint face is controlled at 0.08 μm or less；Being fixed using fixture to the workpiece to be connected after finishing and applying pressure ensures joint face tight；Cover board is pre-processed and be made to transparent material, then its circular joint face is fixed on to the surrounding of workpiece to be connected, it is ensured that joint face is enclosed in transparent material；It is aligned with femtosecond laser to welding line, joint face is welded along weld seam；It after the completion of welding, waits for a period of time, until workpiece to be welded is completely cooled down to room temperature, then unloads lower cover plate.The present invention can make the connection of metal material progress atom degree by pressure and Femtosecond-Laser Pulse Excitation, and the weld strength high tenacity of acquisition is good.
Description
Technical field
It is specially a kind of to pass through transparent material for titanium, aluminium gold with femtosecond laser the present invention relates to metal material connection area
Belong to the method for material welding.
Background technique
Femtosecond laser instantaneous power is huge, and pulse is extremely short, and very high peak value can be obtained under lower pulse energy
Intensity.Due to the characteristics of generating nonlinear effect when irradiation transparent material, femtosecond laser can be worn by Multiphoton Absorbtion mechanism
It crosses transparent material and carries out flexible Three-dimension process, and Long Pulse LASER can not then accomplish this point.And transparent material is brittleness
Material, Long Pulse LASER add thermogenetic thermal stress that transparent material can be made to occur to rupture and have fragment to fly out.Because working as laser
When being irradiated to transparent material, it may occur that damage from laser, and damage threshold is obviously reduced with the decline of pulse width, so femtosecond
Laser has the damage threshold of very little, and femtosecond laser will not cause the rupture of transparent material through transparent material.Femtosecond laser is worn
When crossing transparent material, energy is limited in the range of skin depth, and action time is extremely short, and energy does not have enough time also expanding
It dissipates, the metal material being applied just has been heated to high temperature, evaporates directly in the form of gas phase, band while evaporation
Most of heat is walked, so that heat affected area very little.Therefore Precision Machining may be implemented in femtosecond laser, its resolution ratio can achieve
Several microns.
Traditional arc-welding method welding surroundings are severe, in the welding process along with splashing, arc light and pernicious gas,
Not only not environmentally, but also threat can be generated to the health of operative employee.Femtosecond laser processing has energy height concentration, heat affected area
It is small, without splashing without slag, not needing special gas environment, without the outstanding advantages such as subsequent technique, edge quality be good.Especially processing
Under requirement with high accuracy, traditional arc-welding cannot be met the requirements.Since aluminium, titanium are all active metals, easily aoxidize, and two
Physics, mechanical performance between person is there are bigger difference, and such as fusing point of the two differs about 800 DEG C, the lattice types of the two, lattice
The crystal chemistry performance difference such as parameter is very big, and the thermal conductivity and linear expansion coefficient of aluminium are 16 times and 3 times of titanium respectively.Therefore aluminium
The weldability of titanium dissimilar metal is very poor, and the intensity of connector cannot be met the requirements, the welding of aluminium titanium dissimilar metal be both hot spot and
Difficult point, there is presently no a kind of techniques of maturation can be used for actual production.
Summary of the invention
The purpose of the present invention is to provide a kind of methods using femtosecond laser welding titanium, aluminum metallic material.
In order to achieve the above objectives, technical scheme is as follows: a kind of to weld titanium, aluminum metallic material using femtosecond laser
Method, include the following steps:
(1) titanium, aluminum metallic material are processed into identical two workpiece of joint face；
(2) it treats connection workpiece to be pre-processed and finished, so that the surface roughness Ra control to joint face exists
0.08 μm or less；
(3) being fixed to the workpiece to be connected after finishing using fixture and applied pressure ensures joint face tight；
(4) cover board is pre-processed and be made to transparent material, its circular joint face is then fixed on workpiece to be connected
Surrounding, it is ensured that joint face is enclosed in transparent material；
(5) it is aligned with femtosecond laser to welding line, joint face is welded along weld seam；
(6) it after the completion of welding, waits for a period of time, until workpiece to be welded is completely cooled down to room temperature, then unloads lower cover plate.
Further, in step (2), the pretreatment refers to that treating connection workpiece is cleaned, polished.
Further, in step (4), transparent material selects glass plate.
Further, in step (5), femtosecond laser welding parameter is as follows: the pulse width < 400fs of femtosecond laser, single
Pulse energy is set between 1~40 μ J, speed of welding >=4mm/s.
Compared with prior art, advantages of the present invention and beneficial effect have:
1. can be with high precision to Metal Material Welding.
2. the method for the invention welding metal material convenient and efficient, application prospect are extensive.
3. the method for the invention can make metal material one-pass molding, simple process, as long as setting parameter can connect
It is connected into type.
4. metal material can be made to carry out the connection of atom degree by pressure and Femtosecond-Laser Pulse Excitation in the present invention, obtain
Weld strength high tenacity it is good.
5. in the present invention after Femtosecond-Laser Pulse Excitation, due to the closing of glass plate, the metal vapors rapid precipitation of evaporation, protection
While weld seam, welding is had no effect on, strengthens the intensity of join domain, steam, which takes away most of heat, makes heat affected area very
It is small.
6. being carried out under closed environment in femtosecond laser welding process of the present invention, avoid connector and be oxidized, improves weldering
Stitch quality.
7. femtosecond laser heating speed is fast in the present invention, metal transient evaporation can be made, solve traditional welding method pair
Yu Tai, aluminum metallic material fusing point differ greatly, it is difficult to the problem of welding.
Detailed description of the invention
Fig. 1 for the femtosecond laser connection method institute use device of one embodiment of the invention schematic three dimensional views.
Wherein, 1 one piece of titanium mesh is indicated, 2 indicate metal board clamp, and 3 indicate femtosecond laser welding gun, and 4 indicate transparent material
Expect cover board, 5 indicate another piece of aluminium metal sheet, and 6 indicate transparent material cover plate clamper, and 7 indicate to apply horizontal direction join domain pressure
Lead screw handle.
Specific embodiment
As shown in Fig. 1, titanium plate 1, aluminium sheet 5 are processed into the size of 3mm thickness 150mm × 150mm, then with anhydrous second
Alcohol is clean by surface clean and polishes.The surface to joint face of titanium plate 1, aluminium sheet 5 is finished, so that rough surface
Spending Ra is 0.05 μm.Then titanium plate 1, aluminium sheet 5 are aligned to joint face fixed with the first fixture 2.Then rotating threaded shaft handle 7, to
Joint face applies pressure, it is ensured that joint face tight.Glass plate 4 is processed into cover board, and is pre-processed, and to its surface into
Row finishing, surface roughness Ra are 0.04 μm.Then its circular joint face is fixed on titanium plate 1, aluminium sheet using the second fixture 6
The surrounding of 5 joint faces, it is ensured that joint face is enclosed in glass plate 4.The focus of laser welding gun 3 is calibrated to titanium plate 1, aluminium sheet 5
Joint face, the repetition rate of femtosecond laser are 4MHz, laser pulse width 160fs, speed of welding 5mm/s, then along to
Welding line welds titanium plate 1, aluminium sheet 5, after cooling, obtains good weld seam.By tensile strength test, titanium-aluminium sheet weld seam
Tensile strength can achieve 180Mpa, can achieve the 50% of the tensile strength of substrate aluminium sheet, obtained than traditional welding method
Weld strength is slightly good.
Claims (3)
1. a kind of weld titanium-aluminum dissimilar metal method using femtosecond laser, which comprises the steps of:
Titanium, aluminum metallic material are processed into identical two workpiece of joint face；
Treat connection workpiece pre-processed and finished so as to joint face surface roughness Ra control 0.08 μm with
Under；
Being fixed using fixture to the workpiece to be connected after finishing and applying pressure ensures joint face tight；
Cover board is pre-processed and is made to transparent material, then its circular joint face is fixed on to the surrounding of workpiece to be connected,
Ensure that joint face is enclosed in transparent material；
With femtosecond laser alignment to welding line, it is as follows to carry out welding femtosecond laser welding parameter to joint face along weld seam: femtosecond swashs
The pulse width < 400fs of light, single pulse energy are set between 1~40 μ J, speed of welding >=4mm/s；
It after the completion of welding, waits for a period of time, until workpiece to be welded is completely cooled down to room temperature, then unloads lower cover plate.
2. welding titanium-aluminum dissimilar metal method using femtosecond laser as described in claim 1, which is characterized in that step (2)
In, the pretreatment refers to that treating connection workpiece is cleaned, polished.
3. welding titanium-aluminum dissimilar metal method using femtosecond laser as described in claim 1, which is characterized in that step (4)
In, transparent material selects glass plate.
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| CN201610809741.3A CN106271047B (en) | 2016-09-08 | 2016-09-08 | A method of titanium-aluminum dissimilar metal is welded using femtosecond laser |
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| CN201610809741.3A CN106271047B (en) | 2016-09-08 | 2016-09-08 | A method of titanium-aluminum dissimilar metal is welded using femtosecond laser |
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| CN106271047A CN106271047A (en) | 2017-01-04 |
| CN106271047B true CN106271047B (en) | 2019-01-18 |
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| CN109353013B (en) * | 2018-10-30 | 2021-07-20 | 大族激光科技产业集团股份有限公司 | Monitoring method of laser welding plastic |
| CN111153709A (en) * | 2020-01-16 | 2020-05-15 | 南京理工大学 | Method for connecting transparent ceramics by adopting ultra-narrow laser |
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| US20070169806A1 (en) * | 2006-01-20 | 2007-07-26 | Palo Alto Research Center Incorporated | Solar cell production using non-contact patterning and direct-write metallization |
| US9878399B2 (en) * | 2013-03-15 | 2018-01-30 | Jian Liu | Method and apparatus for welding dissimilar material with a high energy high power ultrafast laser |
| CN103143804B (en) * | 2013-03-15 | 2016-03-23 | 哈尔滨工业大学 | A kind of titanium, aluminum dissimilar metal ultrasonic wave added flame brazing method |
| CN103433584A (en) * | 2013-06-19 | 2013-12-11 | 哈尔滨工业大学 | Medium-temperature brazing method of dissimilar metals of titanium and aluminium under atmospheric condition |
| EP2871020A1 (en) * | 2013-11-11 | 2015-05-13 | Siemens Aktiengesellschaft | Welding of two parts to each other and resulting component |
| US9643361B2 (en) * | 2014-05-27 | 2017-05-09 | Jian Liu | Method and apparatus for three-dimensional additive manufacturing with a high energy high power ultrafast laser |
| CN205764438U (en) * | 2015-02-09 | 2016-12-07 | 司浦爱激光技术英国有限公司 | Laser welded seam and the article including laser welded seam |
| CN105149778B (en) * | 2015-07-30 | 2017-07-18 | 江苏大学 | A kind of device and method for eliminating aluminum steel dissimilar metal laser welding crackle and stomata |
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Application publication date: 20170104 Assignee: JIANGSU HUANENG CABLE Co.,Ltd. Assignor: NANJING University OF SCIENCE AND TECHNOLOGY Contract record no.: X2022980006890 Denomination of invention: A method of welding titanium aluminum dissimilar metals by femtosecond laser Granted publication date: 20190118 License type: Common License Record date: 20220601 |
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