CN106271047A - A kind of method using femtosecond laser welding titanium aluminum dissimilar metal - Google Patents
A kind of method using femtosecond laser welding titanium aluminum dissimilar metal Download PDFInfo
- Publication number
- CN106271047A CN106271047A CN201610809741.3A CN201610809741A CN106271047A CN 106271047 A CN106271047 A CN 106271047A CN 201610809741 A CN201610809741 A CN 201610809741A CN 106271047 A CN106271047 A CN 106271047A
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- China
- Prior art keywords
- workpiece
- femtosecond laser
- joint face
- titanium
- welded
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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
The invention discloses a kind of method using femtosecond laser welding titanium aluminum dissimilar metal, comprise the steps: titanium, aluminum metallic material are processed into be connected identical two workpiece；Workpiece to be connected is carried out pretreatment and polish so that the surface roughness Ra of to be connected controls below 0.08 μm；Use fixture the workpiece to be connected after polish to be fixed and applies pressure and guarantee joint face tight；Transparent material carried out pretreatment and makes cover plate, then it being fixed on around joint face the surrounding of workpiece to be connected, it is ensured that joint face is enclosed in transparent material；Treat welding line with femtosecond laser alignment, along weld seam, joint face is welded；After having welded, wait for a period of time, until workpiece to be welded is completely cooled down to room temperature, then unload lower cover.The present invention can make metal material carry out the connection of atom degree by pressure and Femtosecond-Laser Pulse Excitation, it is thus achieved that weld strength high tenacity good.
Description
Technical field
The present invention relates to metal material connection area, be specially a kind of femtosecond laser through transparent material by titanium, aluminium gold
The method belonging to material welding.
Background technology
Femtosecond laser instantaneous power is huge, and pulse is extremely short, can obtain the highest peak value under relatively low pulse energy
Intensity.Owing to producing nonlinear effect when irradiating transparent material, femtosecond laser relies on multiphoton absorption mechanism to wear
Crossing transparent material and carry out Three-dimension process flexibly, Long Pulse LASER then cannot accomplish this point.And transparent material is fragility
Material, Long Pulse LASER adds thermogenetic thermal stress can be made transparent material 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 least damage threshold, and femtosecond laser will not cause rupturing 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 has enough time to expand
Dissipating, the metal material being applied just has been heated to high temperature, directly evaporates with the form of gas phase, carries while evaporation
Walk major part heat so that heat affected area is the least.Therefore femtosecond laser can realize Precision Machining, and its resolution can reach
Several microns.
Traditional arc-welding method welding surroundings is severe, along with splashing, arc light and harmful gas in welding process,
The most not environmentally, the healthy generation of operative employee can be threatened again.Femtosecond laser processing has energy height concentration, heat affected area
Little, without splashing without slag, need not special gas environment, without outstanding advantages such as subsequent technique, edge quality are good.Especially in processing
Under the requirement that precision is high, traditional arc-welding can not meet requirement.Owing to aluminum, titanium are all active metals, easily aoxidize, and two
There is bigger difference in physics, mechanical performance between person, the fusing point such as both differs about 800 DEG C, both lattice types, lattice
The crystal chemistry performance differences such as parameter are very big, and the thermal conductivity of aluminum and linear expansion coefficient are 16 times and 3 times of titanium respectively.Therefore aluminum
The weldability of titanium dissimilar metal is very poor, and the intensity of joint can not meet requirement, and the welding of aluminum titanium dissimilar metal is that focus is also
Difficult point, the technique that there is presently no a kind of maturation may be used for actual production.
Summary of the invention
It is an object of the invention to provide a kind of use femtosecond laser weld titanium, the method for aluminum metallic material.
For reaching above-mentioned purpose, technical scheme is as follows: a kind of employing femtosecond laser welding titanium, aluminum metallic material
Method, comprise the steps:
(1) titanium, aluminum metallic material are processed into be connected identical two workpiece；
(2) workpiece to be connected is carried out pretreatment and polish so that the surface roughness Ra of to be connected controls in 0.08 μm
Below；
(3) use fixture the workpiece to be connected after polish to be fixed and applies pressure and guarantee joint face tight；
(4) transparent material carried out pretreatment and make cover plate, then it being fixed on the four of workpiece to be connected around joint face
Week, it is ensured that joint face is enclosed in transparent material；
(5) treat welding line with femtosecond laser alignment, along weld seam, joint face is welded；
(6) after having welded, wait for a period of time, until workpiece to be welded is completely cooled down to room temperature, then unload lower cover.
Further, in step (2), described pretreatment refers to workpiece to be connected is carried out, is polished.
Further, in step (4), glass plate selected by transparent material.
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 is extensive.
3. the method for the invention can make metal material one-shot forming, and technique is simple, can connect as long as setting parameter
It is connected into type.
4. the present invention can make metal material carry out the connection of atom degree by pressure and Femtosecond-Laser Pulse Excitation, it is thus achieved that
Weld strength high tenacity 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, having no effect on welding, strengthen the intensity of join domain, steam takes away major part heat makes heat affected area very
Little.
Femtosecond laser welding process the most of the present invention carries out under closed environment, it is to avoid joint is oxidized, improves weldering
Seam quality.
7. in the present invention, femtosecond laser heating speed is fast, can make metal transient evaporation, solve traditional welding method pair
Yu Tai, aluminum metallic material fusing point differ greatly, it is difficult to a difficult problem for welding.
Accompanying drawing explanation
The schematic three dimensional views of the used device of femtosecond laser method of attachment that Fig. 1 is one embodiment of the invention.
Wherein, 1 represents one piece of titanium mesh, and 2 represent metallic plate fixture, and 3 represent femtosecond laser welding gun, and 4 represent transparent material
Material cover plate, 5 represent another block aluminium metal sheet, and 6 represent transparent material cover plate clamper, and 7 represent that applying level is to join domain pressure
Leading screw handle.
Detailed description of the invention
As shown in Figure 1, titanium plate 1, aluminium sheet 5 are processed into the size of 3mm thickness 150mm × 150mm, then use anhydrous second
Surface clean totally and is polished by alcohol.The surface of titanium plate 1, to be connected of aluminium sheet 5 is carried out polish so that rough surface
Degree Ra is 0.05 μm.Then by be connected to titanium plate 1, aluminium sheet 5 in the face of fixing with the first fixture 2 together.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 plate, and carries out pretreatment, and its surface is entered
Row polish, surface roughness Ra is 0.04 μm.Then the second fixture 6 is used to be fixed on titanium plate 1, aluminium sheet around joint face it
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 is 4MHz, and laser pulse width is 160fs, and speed of welding is 5mm/s, then along treating
Titanium plate 1, aluminium sheet 5 are welded, after cooling by welding line, it is thus achieved that good weld seam.Test through tensile strength, titanium-aluminium sheet weld seam
Tensile strength can reach 180Mpa, can reach substrate aluminium sheet tensile strength 50%, obtain than traditional welding method
Weld strength is the best.
Claims (4)
1. the method using femtosecond laser welding titanium-aluminum dissimilar metal, it is characterised in that comprise the steps:
Titanium, aluminum metallic material are processed into be connected identical two workpiece；
Workpiece to be connected is carried out pretreatment and polish so that the surface roughness Ra of to be connected control 0.08 μm with
Under；
Use fixture the workpiece to be connected after polish to be fixed and applies pressure and guarantee joint face tight；
Transparent material is carried out pretreatment and makes cover plate, then it is fixed on around joint face the surrounding of workpiece to be connected,
Guarantee that joint face is enclosed in transparent material；
Treat welding line with femtosecond laser alignment, along weld seam, joint face is welded；
After having welded, wait for a period of time, until workpiece to be welded is completely cooled down to room temperature, then unload lower cover.
2. the method using femtosecond laser welding titanium-aluminum dissimilar metal as claimed in claim 1, it is characterised in that step (2)
In, described pretreatment refers to workpiece to be connected is carried out, is polished.
3. the method using femtosecond laser welding titanium-aluminum dissimilar metal as claimed in claim 1, it is characterised in that step (4)
In, glass plate selected by transparent material.
4. the method using femtosecond laser welding titanium-aluminum dissimilar metal as claimed in claim 1, it is characterised in that step (5)
In, femtosecond laser welding parameter is as follows: the pulse width ＜ 400fs of femtosecond laser, single pulse energy be set in 1～40 μ J it
Between, speed of welding >=4mm/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
|---|---|
| CN106271047A true CN106271047A (en) | 2017-01-04 |
| CN106271047B CN106271047B (en) | 2019-01-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109353013A (en) * | 2018-10-30 | 2019-02-19 | 大族激光科技产业集团股份有限公司 | The monitoring method of plastic welding laser |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109353013A (en) * | 2018-10-30 | 2019-02-19 | 大族激光科技产业集团股份有限公司 | The monitoring method of plastic welding laser |
| 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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| Publication number | Publication date |
|---|---|
| CN106271047B (en) | 2019-01-18 |
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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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