CN107570866A - A kind of method for laser welding of thin plate - Google Patents
A kind of method for laser welding of thin plate Download PDFInfo
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- CN107570866A CN107570866A CN201710743649.6A CN201710743649A CN107570866A CN 107570866 A CN107570866 A CN 107570866A CN 201710743649 A CN201710743649 A CN 201710743649A CN 107570866 A CN107570866 A CN 107570866A
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Abstract
The present invention provides a kind of sheet laser welding method, comprises the following steps：S001：The attachment means of two pieces of thin plates of connection are provided and fix the grip device of two pieces of thin plates；S002：According to two pieces of gauges of sheet, the spot diameter of laser welding is determined；S003：The laser according to corresponding to selecting spot diameter；S004：Cutting of the laser to two pieces of thin plate junctions, what it cut plays weldering section and receives the outside that weldering Duan Jun is drawn out to effective weld seam.The present invention can realize sealing effectiveness, extend the application of stainless steel ultra thin plate.
Description
Technical field
The invention belongs to laser welding field, more particularly to a kind of method for laser welding of thin plate.
Background technology
Laser welding has that forming quality is good, heat affected area is small, workpiece deflection is small, following process amount is few, flexibility is high
The advantages that, it is highly suitable for the welding forming of sheet metal.Laser welding substantially may be used according to the difference of the heat transfer mechanism of welding
It is divided into two kinds of the weldering of laser thermal conductivity and Laser Deep Penetration Welding.After laser heat input exceedes certain threshold value, bond pattern is by thermal conductivity progress of weld
Deep penetration welding transformation with " keyhole effect ", so as to realize the full penetration of sheet metal.In sheet metal Laser Deep Penetration Welding
Under the conditions of full penetration, when laser heat input is relatively low, plate sheet welding shaping pattern is in ailhead shape (V-arrangement), i.e., laser directly acts on
Thin plate fillet in normal shear it is wider and sealing run is narrower；When laser heat input is sufficiently large, then occur having single-sided welding two-sided
Hourglass shape (X-shaped) weld seam of shaping, the i.e. weld width of thin plate front and back are roughly the same.Obviously, hourglass shape (X-shaped) weld seam
There is more preferable mechanical property compared with ailhead shape (V-arrangement) weld seam.However, under the conditions of sheet metal Laser Deep Penetration Welding full penetration,
Obtaining hourglass shape (X-shaped) weld seam then needs larger heat input.But welded for sheet metal, larger heat input will
It can cause sheet metal thermal deformation increase and the adverse effects such as heat affected area broadens, greatly affect sheet metal welding forming
Quality.
In sheet metal Laser Deep Penetration Welding weld forming process, based on control thin plate welding deformation and reduce heat affected area
Deng consideration, when heat input, which reaches, to realize that sheet metal penetrates entirely i.e. plate sheet welding shaping pattern be in ailhead shape (V-arrangement),
I.e. it is believed that now laser welding process parameter is more excellent, because its welding thermal deformation and heat affected area are small, therefore generally by such a state
It is defined as low_input_power.In fact, when laser realizes the full moment for penetrating sheet metal, laser beam can enter sheet metal bottom
Gas (if having protective gas be protective gas in laser beam welding, if be air without if) medium in.It is well known that swash
The time that light belongs to high energy beam current and acted in welding process on one point is extremely short.In other words, laser is realized penetrates metal foil entirely
The proportion that the energy entered in plate moment in gas medium accounts for laser overall output energy is larger, if this fraction of laser light energy energy
Enough it is used effectively, then is expected to obtain hourglass shape (X-shaped) weld seam with more preferable mechanical property under low_input_power state, and then
Take into account the mechanical property of weld seam and thermal deformation and the heat affected area of control thin plate.
Using the battery container of stainless steel ultra thin plate manufacture is in light weight, intensity is high, regular shape, rigid big, battery capacity
It is high.But how the stainless steel ultra thin plate for forming battery container to be sealed, turn into and restrict stainless steel ultra thin plate in field of batteries application
Key factor.
The content of the invention
It is an object of the invention to provide a kind of method for laser welding of the thin plate with sealing effectiveness.
The present invention provides a kind of sheet laser welding method, comprises the following steps：
S001：The attachment means of two pieces of thin plates of connection are provided and fix the grip device of two pieces of thin plates；
S002：According to two pieces of gauges of sheet, the spot diameter of laser welding is determined；
S003：The laser according to corresponding to selecting spot diameter；
S004：Welding of the laser to two pieces of thin plate junctions, its weldering section welded and receipts weldering Duan Jun are drawn out to effectively
The outside of weld seam.
Preferably, the step S003 is also included according to the corresponding optical fiber of spot diameter choosing, collimating mirror, focus lamp, work
Make platform and air blowing protector, welding and assembling height is determined according to the focal length of the focus lamp of selection, determined according to the shape of two pieces of thin plates
Welding track.
Preferably, grip device is 1~2mm from the distance between weld seam.
Preferably, the gross thickness of spot diameter D1=(0.33~1) * two pieces of thin plates.
Preferably, spot diameter D1=D2*f1/f2, wherein, D2 is fibre diameter, and f1 is focus lamp focal length, and f2 is collimation
Mirror focal length.
Preferably, the determination method of welding and assembling height is as follows：
A1：Grip device is fixed on a workbench；
A2：Two pieces of thin plates are installed on grip device and clamping device device；
A3：Got ready in welded joints with being slightly less than the energy of normal weld；
A4：It can be seen that, welding spot size is in first to reduce to increase afterwards with increase of the focus lamp from thin plate height under the microscope
The trend added.
Preferably, height corresponding in an intermediate position and smallest size of solder joint is welding and assembling height.
Preferably, the determination method of welding track is as follows：Using specific thin sheet form as reference, formed along battery container
The welding track of one closing.
Preferably, laser welding peak power and pulse width need to be adjusted with reference to the fusion penetration and molten wide of actual welds,
Under fixed speed of welding, several samples are respectively welded with laser peak power from small to large and pulse width, then cut
Seam observation fusion penetration and molten wide are snapped, chooses the peak power and pulse width corresponding to suitable fusion penetration molten wide.
Preferably, pulse frequency f=v/ (0.2~0.5d), wherein, v is speed of welding, and d is welding spot size.
The present invention can realize sealing effectiveness, extend the application of stainless steel ultra thin plate.
Brief description of the drawings
Fig. 1 is the schematic diagram of two pieces of plate sheet weldings of the invention.
Embodiment
The method for laser welding of thin plate of the present invention, comprises the following steps：
S001：The attachment means of two pieces of thin plates of connection are provided and fix the grip device of two pieces of thin plates；
S002：According to two pieces of gauges of sheet, the spot diameter of laser welding is determined；
S003：The laser according to corresponding to selecting spot diameter；
S004：Welding of the laser to two pieces of thin plate junctions, its weldering section welded and receipts weldering Duan Jun are drawn out to effectively
The outside of weld seam.
Wherein, step S003 also include according to spot diameter select corresponding optical fiber, collimating mirror, focus lamp, workbench and
Air blowing protector, welding and assembling height is determined according to the focal length of the focus lamp of selection；Welding rail is determined according to the shape of two pieces of thin plates
Mark；The parameters such as laser peak power, pulse width, speed of welding, pulse frequency are adjusted to reach sealing effectiveness.
As shown in figure 1, thin plate of the present invention is battery container, battery container is very thin, as stainless steel metal thin plate.
Wherein, attachment means are lap joint.Laser energy is small during due to plate sheet welding, very sensitive to welded gaps,
Therefore need to use a kind of attachment means that two pieces of thin plates can be made to fit together completely.As shown in figure 1,1 is lower thin sheet, 2
For upper thin sheet.Using lap joint, weld seam 3 is guided to the outside of two pieces of thin plates 1,2, then it is thin by upper and lower two pieces with grip device 5
Plate 1,2 compresses, and laser beam 4 welds to weld seam 3, so as to eliminate welded gaps to greatest extent, it is also possible to prevent burn-through pair
The damage of inside battery battery core.
Upper thin sheet 2 and lower thin sheet 1 are compressed fitting by grip device 5, and can realize backside gas defencive function.Fixture fills
It is 1~2mm that 5, which are put, from the distance between weld seam 3.Backside gas protection can prevent back of weld to be oxidized, and grip device 5 is from weldering
The distance of seam 3 can realize substrate hold-down function for 1~2mm, not affect laser beam again.
The gross thickness of spot diameter D1=(0.33~1) * two pieces of thin plates.Because using heat transfer during plate sheet welding
Weldering, fusion penetration and the molten wide ratio of weld seam are essentially 1.The ratio of weld pool width and spot diameter is substantially between 1 and 3.Therefore obtain
The gross thickness of * two pieces of ultra thin plates of the spot diameter D1=(0.33~1).
Spot diameter D1=D2*f1/f2.Wherein, D2 is fibre diameter, and f1 is focus lamp focal length, and f2 is collimating mirror focal length.
In stainless steel ultra thin plate welding process, it should try one's best from the larger focus lamp of focal length.Because focal length is bigger, laser energy is in height
It is more stable to spend direction.
The determination method of welding and assembling height is as follows：
A1：Grip device is fixed on a workbench；
A2：Two pieces of thin plates are installed on grip device and clamping device device；
A3：Got ready in welded joints with being slightly less than the energy of normal weld；
A4:It can be seen that, welding spot size is in first to reduce to increase afterwards with increase of the focus lamp from thin plate height under the microscope
The trend added：Height corresponding in an intermediate position and smallest size of solder joint is welding and assembling height.
The determination method of welding track is as follows：Reference is shaped as with specific battery container, one is formed along battery container
The welding track of bar closing.
Wherein it should be noted that playing weldering section and receiving weldering section needs to be drawn out to the outside of effective weld seam：Because rise weldering section by
Low in workpiece temperature, workbench accelerates since static, causes weld seam energy unstable；Receive weldering section and welding pit be present, easily produce
Welding pit crackle.
Laser welding peak power and pulse width need to be adjusted with reference to the fusion penetration and molten wide of actual welds, fixed
Under speed of welding, several samples are respectively welded with laser peak power from small to large and pulse width, weld seam is then cut and sees
Fusion penetration and molten wide are examined, chooses peak power and pulse width corresponding to suitable fusion penetration molten wide.
The pulse frequency of laser welding needs to determine that generally, solder joint is overlapping according to speed of welding and welding spot size
Rate 50%~80~between sealing can be achieved.Therefore, pulse frequency f=v/ (0.2~0.5d), wherein, v is speed of welding, d
For welding spot size.
For the 316L stainless steel ultra thin plates that thickness in monolayer is 0.075mm, welded using optical fiber laser.Connection dress
Put as shown in Figure 1 with the structure of grip device 5.The optical fiber core diameter used is 50um, collimating mirror focal length 100mm, focus lamp focal length
180mm, spot diameter 90um, defocusing amount 0mm.Protection gas is Ar gas, and positive and negative flow is 10L/min.Peak power
0.14Kw, pulse width 0.30ms, speed of welding 30mm/s, pulse frequency 600Hz.It is uniform to obtain weld appearance, lines is consistent.
Pool：Molten wide 0.17mm, fusion penetration 0.13mm.Weld seam is without deformation and splashes, and weld seam is by infiltration and helium inspection, equal No leakage
Phenomenon, good sealing effectiveness can be reached.
The present invention can realize sealing effectiveness, extend the application of stainless steel ultra thin plate.
The preferred embodiment of the present invention described in detail above, but the present invention is not limited in above-mentioned embodiment
Detail, in the range of the technology design of the present invention, a variety of equivalents can be carried out to technical scheme, these
Equivalents belong to protection scope of the present invention.
Claims (10)
1. a kind of method for laser welding of thin plate, it is characterised in that comprise the following steps：
S001：The attachment means of two pieces of thin plates of connection are provided and fix the grip device of two pieces of thin plates；
S002：According to two pieces of gauges of sheet, the spot diameter of laser welding is determined；
S003：The laser according to corresponding to selecting spot diameter；
S004：Welding of the laser to two pieces of thin plate junctions, its weldering section welded and receipts weldering Duan Jun are drawn out to effective weld seam
Outside.
2. the method for laser welding of thin plate according to claim 1, it is characterised in that：The step S003 also includes basis
Corresponding optical fiber, collimating mirror, focus lamp, workbench and the air blowing protector of spot diameter choosing, according to the focus lamp of selection
Focal length determines welding and assembling height, and welding track is determined according to the shape of two pieces of thin plates.
3. the method for laser welding of thin plate according to claim 1, it is characterised in that：Grip device between weld seam away from
From for 1~2mm.
4. the method for laser welding of thin plate according to claim 1, it is characterised in that：Spot diameter D1=(0.33~1) *
The gross thickness of two pieces of thin plates.
5. the method for laser welding of thin plate according to claim 2, it is characterised in that：Spot diameter D1=D2*f1/f2,
Wherein, D2 is fibre diameter, and f1 is focus lamp focal length, and f2 is collimating mirror focal length.
6. the method for laser welding of thin plate according to claim 1, it is characterised in that：The determination method of welding and assembling height is such as
Under：
A1：Grip device is fixed on a workbench；
A2：Two pieces of thin plates are installed on grip device and clamping device device；
A3：Got ready in welded joints with being slightly less than the energy of normal weld；
A4：It can be seen that, welding spot size is as increase of the focus lamp from thin plate height is in increased after first reducing under the microscope
Trend.
7. the method for laser welding of thin plate according to claim 6, it is characterised in that：In an intermediate position and size is most
Height corresponding to small solder joint is welding and assembling height.
8. the method for laser welding of thin plate according to claim 1, it is characterised in that：The determination method of welding track is such as
Under：Using specific thin sheet form as reference, the welding track of a closing is formed along battery container.
9. the method for laser welding of thin plate according to claim 1, it is characterised in that：Laser welding peak power and pulse
Width need to combine the fusion penetration of actual welds and molten wide is adjusted, under fixed speed of welding, with laser peak from small to large
Several samples are respectively welded in value power and pulse width, then cut weld seam observation fusion penetration and molten wide, choose suitable fusion penetration and melt
Peak power and pulse width corresponding to width.
10. the method for laser welding of thin plate according to claim 9, it is characterised in that：Pulse frequency f=v/ (0.2~
0.5d), wherein, v is speed of welding, and d is welding spot size.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710743649.6A CN107570866A (en) | 2017-08-25 | 2017-08-25 | A kind of method for laser welding of thin plate |
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| CN201710743649.6A CN107570866A (en) | 2017-08-25 | 2017-08-25 | A kind of method for laser welding of thin plate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111805087A (en) * | 2020-05-20 | 2020-10-23 | 中车青岛四方机车车辆股份有限公司 | Double-beam laser welding method and welding device |
| CN112643203A (en) * | 2020-11-18 | 2021-04-13 | 欣旺达电动汽车电池有限公司 | Workpiece welding method, electrode assembly, single battery and electric equipment |
| WO2021249349A1 (en) * | 2020-06-07 | 2021-12-16 | 厦门海辰新能源科技有限公司 | Connecting assembly, battery module and battery pack |
| CN114029620A (en) * | 2021-12-09 | 2022-02-11 | 上海交通大学 | Welding process for ultrathin metal material |
| CN115488504A (en) * | 2022-09-23 | 2022-12-20 | 北京工业大学 | Laser welding process for realizing continuous regulation and control of effective fusion width of bonding surface of laser lap joint of active thermal protection structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111805087A (en) * | 2020-05-20 | 2020-10-23 | 中车青岛四方机车车辆股份有限公司 | Double-beam laser welding method and welding device |
| WO2021249349A1 (en) * | 2020-06-07 | 2021-12-16 | 厦门海辰新能源科技有限公司 | Connecting assembly, battery module and battery pack |
| CN112643203A (en) * | 2020-11-18 | 2021-04-13 | 欣旺达电动汽车电池有限公司 | Workpiece welding method, electrode assembly, single battery and electric equipment |
| CN114029620A (en) * | 2021-12-09 | 2022-02-11 | 上海交通大学 | Welding process for ultrathin metal material |
| CN115488504A (en) * | 2022-09-23 | 2022-12-20 | 北京工业大学 | Laser welding process for realizing continuous regulation and control of effective fusion width of bonding surface of laser lap joint of active thermal protection structure |
| CN115488504B (en) * | 2022-09-23 | 2024-06-04 | 北京工业大学 | Laser welding process for realizing continuous regulation and control of effective melting width of laser lap joint junction surface of active heat protection structure |
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Application publication date: 20180112 |