CN110216375A - A kind of laser penetration welding procedure of Aluminum Alloy Plate material - Google Patents
A kind of laser penetration welding procedure of Aluminum Alloy Plate material Download PDFInfo
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- CN110216375A CN110216375A CN201910482456.9A CN201910482456A CN110216375A CN 110216375 A CN110216375 A CN 110216375A CN 201910482456 A CN201910482456 A CN 201910482456A CN 110216375 A CN110216375 A CN 110216375A
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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
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. 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
-
- 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
Abstract
The present invention discloses a kind of laser penetration welding procedure of Aluminum Alloy Plate material, comprising the following steps: a, selection Aluminum Alloy Plate material, with a thickness of 6mm；B, with the cotton with acetone by Aluminum Alloy Plate material wiped clean；C, using argon gas as protective gas, full penetration is carried out using negative defocus by laser, by limiting the weld heat input in welding process so that forming weld seam of the cross section to follow closely shape after the completion of welding；Wherein, weld heat input is lower than 1064J/mm.For the Aluminum Alloy Plate material of 6mm, under the premise of guaranteeing full penetration, it is welded using negative defocus, and it is lower than 1064J/mm by limiting weld heat input, and then can obtain cross section is the weld seam for following closely shape, so that welding point has optimal hardness performance and tensile property, average hardness reaches 69HV, and average tensile strength reaches 206.33MPa.
Description
Technical field
The present invention relates to laser welding field more particularly to a kind of laser penetration welding procedures of Aluminum Alloy Plate material.
Background technique
Aluminium alloy is because of specific strength with higher and specific stiffness, corrosion resistance and good, nonmagnetic, good conductive, thermally conductive
Property and good processing and mechanical property, using more and more extensive.For the Aluminum Alloy Plate material of 6mm, making
Make mainly to pass through welding forming when each component.However, the Aluminum Alloy Plate material of existing 6mm is after the completion of welding, welding point
Hardness performance, tensile property it is poor, as a result, be badly in need of solve.
Summary of the invention
It is existing to solve the purpose of the present invention is to provide a kind of laser penetration welding procedure of Aluminum Alloy Plate material
The Aluminum Alloy Plate material of 6mm is after the completion of welding, the poor problem of hardness performance, the tensile property of welding point.
The purpose of the present invention is be achieved through the following technical solutions:
A kind of laser penetration welding procedure of Aluminum Alloy Plate material, comprising the following steps:
A, Aluminum Alloy Plate material is selected, with a thickness of 6mm；
B, with the cotton with acetone by Aluminum Alloy Plate material wiped clean；
C, using argon gas as protective gas, full penetration is carried out using negative defocus by laser, is welded by limiting
Weld heat input in the process is so that forming cross section after the completion of welding is the weld seam for following closely shape；Wherein, weld heat input is lower than
1064J/mm。
As a preferred solution of the present invention, the ingredient of Aluminum Alloy Plate material as mass fraction, Cu:0.15%~
0.4%, Mn:0.15%, Mg:0.8%~0.12%, Zn:0.25%, Cr:0.04%~0.35%, Ti:0.15%, Si:
0.4%~0.8%, Fe:0.7%, surplus Al.
As a preferred solution of the present invention, the weld heat input is 400J/mm~1000J/mm.
As a preferred solution of the present invention, the throughput of the protective gas is 20L/min~25L/min.
As a preferred solution of the present invention, the negative defocus is -8mm~-2mm.
As a preferred solution of the present invention, the laser is optical fiber laser.
The invention has the benefit that under the premise of guaranteeing full penetration, being used for the Aluminum Alloy Plate material of 6mm
Negative defocus is welded, and is lower than 1064J/mm by limiting weld heat input, and then can obtain cross section is the weldering for following closely shape
Seam, so that welding point has optimal hardness performance and tensile property, average hardness reaches 69HV, and average tensile is strong
Degree reaches 206.33MPa.
Detailed description of the invention
Fig. 1 is the weld contour figure under 25 groups of different technical parameters；
Fig. 2 is model schematic；
Fig. 3 is regional allocations figure of the weld contour with experimental parameter；
Fig. 4 is the metallographic structure figure in each region of spike-like weld profile；
Fig. 5 is the metallographic structure figure in each region of wedge-shaped weld seam；
Fig. 6 is the metallographic structure figure in each region of wine cup shape weld seam；
Fig. 7 is the mechanical property schematic diagram of different shape weld seam.
Specific embodiment
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.It is understood that
It is that embodiment described herein is used only for explaining the present invention rather than limiting the invention.
Choose 6mm Aluminum Alloy Plate material, the ingredient of Aluminum Alloy Plate material as mass fraction, Cu:0.15%~
0.4%, Mn:0.15%, Mg:0.8%~0.12%, Zn:0.25%, Cr:0.04%~0.35%, Ti:0.15%, Si:
0.4%~0.8%, Fe:0.7%, surplus Al, laser are YLR-6000 optical fiber lasers, are protected in laser welding experiment
The angle of gas nozzle and breadboard surface normal is 45 °, and distance experiment plate surface is 5mm, will with the cotton with acetone before welding
The surface wipes of Aluminum Alloy Plate material are clean, prevent pollution Aluminum Alloy Plate material, influence test result.
After welding, the hardness distribution situation of electron microscopic hardness tester measurement Welding experiment plate sample part joint, benefit are utilized
With the tensile strength of microcomputer controlled electronic universal tester analysis Welding experiment plate.Last warp cutting sampling, sanding and polishing examination
Metallographic test specimen is prepared into after sample and acid solution corrosion and microscopic structure and weld contour are observed in metallographic microscope.
In order to conclude the irregular undercut of weld seam under different welding procedures and stay degree, weld seam upper surface minimum point is chosen
Weld seam is characterized with plate upper surface distance h stays degree.It is wide that every melt-through weld chooses three cross sections progress weld seams
The measurement of degree is spent and stayed, chooses average value as final result.
Under different defocusing amounts, weld width reduces with the increase of laser power.Defocusing amount is bigger, laser power pair
The influence of weld pool width is bigger, and when defocusing amount is+2mm, laser power changes to 6KW from 4KW, and weld pool width reduces
2.89mm, and defocusing amount be -4mm when molten wide only reduce 1.38mm.
With the increase of laser power, weld seam stays depth reduction.And under conditions of laser power is constant, with from
The increase of coke amount, it is integrally in rising trend to stay depth.When defocusing amount is -6mm, and laser power is 5KW, weld seam stays depth
Degree has reached 1.28mm.And it is 6KW in laser rate, when defocusing amount is negative value, h is maintained between 0.4mm~0.5mm, and variation is very
It is small.So the better weld seam of forming can be obtained using the negative defocus of high power under conditions of guaranteeing penetration.
It below under the conditions of guaranteeing penetration, is welded with 25 groups of different technological parameters, studies 6mm Aluminum Alloy Plate
The seam cross-section change in shape of material.
As shown in Figure 1, being respectively as follows: from left to right in several first rows from top to bottom
A group: bonding power: 6KW, speed of welding: 4.7m/min, defocusing amount: -8mm；
B group: bonding power: 5KW, speed of welding: 3m/min, defocusing amount: -8mm；
C group: bonding power: 4.5KW, speed of welding: 2.3m/min, defocusing amount: -8mm；
D group: bonding power: 4KW, speed of welding: 1.7m/min, defocusing amount: -8mm；
E group: bonding power: 4KW, speed of welding: 1.7m/min, defocusing amount: -6mm；
In second row, it is respectively as follows: from left to right
F group: bonding power: 6KW, speed of welding: 4.8m/min, defocusing amount: -6mm；
G group: bonding power: 5KW, speed of welding: 3.2m/min, defocusing amount: -6mm；
H group: bonding power: 6KW, speed of welding: 4.8m/min, defocusing amount: -6mm；
I group: bonding power: 5KW, speed of welding: 3.3m/min, defocusing amount: -4mm；
J group: bonding power: 4KW, speed of welding: 1.5m/min, defocusing amount: -4mm；
In third row, it is respectively as follows: from left to right
K group: bonding power: 6KW, speed of welding: 3.9m/min, defocusing amount: -2mm；
L group: bonding power: 5.5KW, speed of welding: 3.1m/min, defocusing amount: -2mm；
M group: bonding power: 4KW, speed of welding: 1.5m/min, defocusing amount: -2mm；
N group: bonding power: 6KW, speed of welding: 3.6m/min, defocusing amount: 0mm；
O group: bonding power: 5KW, speed of welding: 2.1m/min, defocusing amount: 0mm；
In 4th row, it is respectively as follows: from left to right
P group: bonding power: 4KW, speed of welding: 1m/min, defocusing amount: 0mm；
Q group: bonding power: 6KW, speed of welding: 2.7m/min, defocusing amount :+2mm；
R group: bonding power: 5KW, speed of welding: 1.4m/min, defocusing amount :+2mm；
S group: bonding power: 4KW, speed of welding: 0.5m/min, defocusing amount :+2mm；
T group: bonding power: 6KW, speed of welding: 1.8m/min, defocusing amount :+4mm；
In 5th row, it is respectively as follows: from left to right
U group: bonding power: 5KW, speed of welding: 1.2m/min, defocusing amount :+4mm；
V group: bonding power: 4.5KW, speed of welding: 0.6m/min, defocusing amount :+4mm；
W group: bonding power: 6KW, speed of welding: 1.62m/min, defocusing amount :+6mm；
X group: bonding power: 5.5KW, speed of welding: 1.2m/min, defocusing amount :+6mm；
Y group: bonding power: 5KW, speed of welding: 0.6m/min, defocusing amount :+6mm；
For the variation that can accurately describe weld shape, welded seam of aluminium alloy shape is carried out using the thought of weld seam subregion
Model as shown in Figure 2 is established in simplification appropriate, and weld seam is reduced to isosceles trapezoid+rectangle+isosceles trapezoid form.Based on
Upper model analyzes the weld seam in Fig. 1, weld shape can be divided into three types.A group, b group, f group, g group, h group, i
Group, j group, k group, the weld seam in l group all have similar shape feature, the trapezoidal and longer middle part rectangle in lesser top, and
Lower part is trapezoidal then almost without it is summarized as spike-like weld profile；C group, d group, that the weld seam in e group only exists apparent top is trapezoidal
Region, the rectangle at middle part and the trapezoid area of lower part all do not occur, it is summarized as wedge-shaped weld seam；M group, o group, p group, q group, r
Group, s group, t group, u group, v group, w group, x group, the weld seam in y group all have the middle part rectangle that apparent top is trapezoidal, shorter and compared with
It is summarized as wine cup shape weld seam by small lower part trapezoidal characteristics.Further research can be found, in negative defocus, high speed and Gao Gong
Under conditions of rate, weld seam is commonly nail shape；Under conditions of positive out of focus, low velocity, weld seam is essentially wine cup shape.To find weld seam
The relationship of shape and technological parameter chooses the power density of common two experimental parameter heat inputs and laser facula in Laser Welding
It is analyzed, as shown in figure 3, being weld contour with the regional allocations figure of experimental parameter, can be seen from figure 3,
When heat input is lower than 1064J/mm, available spike-like weld profile；Heat input is 1064J/mm~1411J/mm, laser facula
Power density is lower than 2KW/mm2, available wedge shape weld seam；Heat input is greater than 2000J/mm, and the power density of laser facula is small
In 32KW/mm2, available wine cup shape weld seam.
Choose a group in Fig. 1, c group, r group respectively as spike-like weld profile, wedge-shaped weld seam, wine cup shape weld seam Typical Representative,
The microscopic structure feature and difference for obtaining different shape weld seam, establish the connection of microstructure and technological parameter.
Fig. 4 is the metallographic structure figure in each region of spike-like weld profile, can clearly be found out from seam cross-section figure, and weld seam is molten
Tissue near zygonema is that the elongate column of vertical melt run direction growth is brilliant, and Weld pipe mill is mostly dendroid from top to bottom
Al-Si eutectic and equiax crystal.This is because the molten bath of spike-like weld profile is smaller, in the liquid phase of solid liquid interface temperature gradient and
The degree of superheat is big, and the surface solidification that molten metal depends on base material crystal grain forms common crystal grain, and crystal grain selects most fast direction of radiating,
I.e. vertical molten bath boundary direction preferential growth, therefore the crystal grain near melt run is the extension column crystal of vertical melt run growth.
And grown as crystal grain is gradually distance from boundary to Weld pipe mill, temperature gradient is gradually reduced, and crystallization rate is gradually accelerated, solute
Mass fraction increases, and constitutional supercooling district is also gradually increased, and the substructure in column crystal is successively to cellular crystal, cellular dendritic crystals, tree
Dendritic TiC development.When crystal growth is to Weld pipe mill, due to smaller temperature gradient and bigger constitutional supercooling, inside liquid phase from
Forming core is sent out, therefore forms a large amount of isometric dendrite.
The discovery of trapezoidal to the top of spike-like weld profile and middle part rectangular area structure observation, the column near ailhead melt run
Crystalline substance is directed toward the center of ailhead with biggish angle, and ailhead center is tiny isometric dendrite and large number of.Rectangular area
Equiax crystal near melt run is directed toward Weld pipe mill as the crow flies, and the isometric dendrite at center increases and intensive compared with ailhead portion size
Degree decline, the especially lower part of rectangular area, there's almost no equiax crystal.
Fig. 5 is the metallographic structure figure in each region of wedge-shaped weld seam, and column crystal is directed toward Weld pipe mill at a certain angle.On weld seam
Portion, it is column crystal and a large amount of equiax crystal that tissue is similar at the top of spike-like weld profile；In the middle part of weld seam, column crystal is with respect to equiax crystal number
Amount increases, but the secondary dendrite of equiax crystal is more flourishing, and growth pattern is typical divergence expression, and equiax crystal intermeshes combination；
Weld seam lower part column crystal further increases, only a small amount of equiaxed dendrite.This is because weld seam upper surface is in cooling gas and plate
Under the cooling effect of itself, the molten metal spontaneous nucleation of Weld pipe mill forms equiax crystal, and since cooling velocity is too fast, isometric
Crystalline substance is grown up without enough time, and secondary dendrite is relatively fewer；Weld seam lower part there are larger hump and bottom molten wide it is smaller therefore cold
But there is no weld seam lower parts to generate too many cooling effect for gas, forms equiax crystal without enough conditions；Plate is only leaned in the middle part of weld seam
Itself is cooling, and temperature gradient decreases compared with upper surface herein, and equiax crystal quantity is relatively fewer, and due to slower cooling speed
Degree, the secondary dendrite of equiax crystal is more flourishing herein.
Fig. 6 is the metallographic structure figure in each region of wine cup shape weld seam, can be seen that base material crystalline substance from the cross section of wine cup shape weld seam
Grain refinement sector width increases, and shows that base material Thermal Cycle region experienced at this time and time increase.To the tissue in weld seam
It is found after carrying out micro-analysis, melt run is nearby coarse column crystal, and compared with spike-like weld profile and wedge-shaped weld seam, column crystal
Size significantly increases.The column crystal of weld seam upper and lower part trapezoid area is grown towards face of weld at a certain angle, and due to
Top is trapezoidal bigger, so the tilt angle of the column crystal of top trapezoid area is bigger.Weld pipe mill is also all equiax crystal, top
The size of region equiax crystal is minimum, and the equiax crystal size of middle part and lower part is not much different, but the weld seam with other two kinds of shapes
In equiax crystal compare, size significantly increases.
Below using microhardness testers to cross measure is carried out at weld seam 1/6,1/2,5/6, as a result, it has been found that consolidation area hardness
To be significantly lower than base material.The hardness of base material fluctuates above or below 85HV, and the hardness number in consolidation area is decreased obviously, and is 65HV or so.This
It is because one side weld metal is heated quickly to fusing shape under the high temperature action of laser in the laser welding of aluminium alloy
State, the temperature of weld metal alreadys exceed solution temperature of the equal hardening constituent of β in Al at this time, therefore the equal master of β in weld seam
It need to strengthen and be mutually all dissolved in molten bath.And in subsequent weld seam cooling procedure, most of Mg, Si atom is again to balance phase
The form of Mg2Si phase is precipitated again, and the strengthening effect of Mg2Si phase can not show a candle to the hardening constituent being precipitated under the equal lower temperature of β, leads
Consolidation area hardness is caused to reduce；Mg element in another aspect aluminium alloy largely evaporates scaling loss in the welding process, so that weld seam
The hardening constituents such as middle MgSi are reduced, and also result in the reduction of hardness.
It is found after being statisticallyd analyze to the hardness in consolidation area, the average hardness of spike-like weld profile and being not much different for wedge shape weld seam,
It is 69HV or more, and the average hardness of wine cup shape weld seam is then only 61HV, and hardness inhomogeneities is also maximum, hardness side
Difference reaches 22.Since the heat input of wine cup shape weld seam is larger, on the one hand causes the crystallite dimension of wine cup shape weld seam to be significantly greater than and follow closely
Shape weld seam and wedge-shaped weld seam, the invigoration effect for generating base material through overaging are easier to disappear.From above-mentioned analysis
As can be seen that the hardness performance of wine cup shape weld seam is worst, the hardness performance of spike-like weld profile and wedge-shaped weld seam is not much different.
Then, three exemplars are chosen to the weld seam of each shape and carries out tensile property test, find stress-displacement of sample
Without apparent " yield point elongation " phenomenon in curve, and sample illustrates that sample is to reach during stretching without obvious constriction
Moment is broken when maximum stress, and in Weld pipe mill position, the result of this and micro-hardness testing is consistent for the position of fracture.
The tensile strength of base material is 333MPa, and elongation percentage is about 18%, the highest tensile strength of weld seam, the i.e. tensile strength of h group sample
For 222MPa, about the 66.67% of base material, elongation percentage is about 2.4%, is far below base material.The fracture macro for stretching sample is seen
It is found after examining, for fracture there are biggish stomata, these stomatas cause the tensile strength of weld seam to reduce.On the other hand, weld metal
It is melted rapidly under laser action, the hardening constituent in base material is also fused in matrix, loses weld seam original strong
Therefore change mechanism, welding line joint soften.
Three typical exemplars are chosen to each shape weld seam, to its tensile strength and elongation after fracture averaged conduct
The tensile strength and elongation percentage of each shape weld seam, as shown in Figure 7.The tensile strength highest of spike-like weld profile, reaches 206.33MPa,
About the 62% of base material,；Followed by wedge-shaped weld seam, tensile strength 183MP reach the 55% of strength of parent；Wine cup shape weld seam
Intensity is minimum, only 174MPa, is the 52% of base material.The elongation after fracture of three kinds of weld seams is not much different, highest for wedge shape weldering
Seam, also only reaches 3.3%, is much smaller than base material.From the point of view of shaped angles, the top trapezoid area of spike-like weld profile is smaller, big absolutely
Part is the approximately parallel rectangular area of melt run, and molten wide reaches unanimity in fusion penetration direction, and this features of shape not only improves weldering
Stitch homogenization of composition, and promote joint geometry uniformly and continuous transition, improve connector stress collected state.From technique
From the point of view of parameter angle, the corresponding heat input of spike-like weld profile is lower, and wedge-shaped weld seam takes second place, wine cup shape highest, and heat input is higher, leads to
The laser energy that the reflection of small holes reaches workpiece lower surface is higher, and the scaling loss of the magnesium elements of entire inside workpiece is bigger, connects
Head softening degree increases with it.
The above analysis it can be seen that, the available spike-like weld profile when heat input is lower than 1064J/mm；Wedge-shaped weld seam
Process conditions are as follows: heat input is 1064J/mm~1411J/mm, and laser facula power is close to be lower than 2KW/mm2；Wine cup shape weld seam
Process parameters range is then larger: heat input is greater than 2000J/mm, and the power density of laser facula is less than 32KW/mm2.Wherein, wine
The hardness performance of cupuliform weld seam is worst, and the hardness performance of spike-like weld profile and wedge-shaped weld seam is not much different, the draftability of spike-like weld profile
Can preferably, wedge-shaped weld seam is secondly, wine cup shape weld seam is worst, it follows that the hardness performance and tensile property of spike-like weld profile are best,
Wedge-shaped weld seam takes second place, and the mechanical property of wine cup shape weld seam is worst.
Embodiment 1
In this present embodiment, the laser penetration welding procedure of a kind of Aluminum Alloy Plate material, comprising the following steps:
A, Aluminum Alloy Plate material is selected, with a thickness of 6mm；
B, with the cotton with acetone by Aluminum Alloy Plate material wiped clean；
C, using argon gas as protective gas, the throughput of the protective gas is 20L/min~25L/min, passes through optical fiber
Laser carries out full penetration using negative defocus, and the negative defocus is -8mm~-2mm, by limiting the weldering in welding process
Wiring energy is so that forming cross section after the completion of welding is the weld seam for following closely shape；Wherein, weld heat input 1000J/mm.
In the present embodiment, the ingredient of Aluminum Alloy Plate material as mass fraction, Cu:0.15%~0.4%, Mn:
0.15%, Mg:0.8%~0.12%, Zn:0.25%, Cr:0.04%~0.35%, Ti:0.15%, Si:0.4%~
0.8%, Fe:0.7%, surplus Al.
Embodiment 2
In this present embodiment, the laser penetration welding procedure of a kind of Aluminum Alloy Plate material, comprising the following steps:
A, Aluminum Alloy Plate material is selected, with a thickness of 6mm；
B, with the cotton with acetone by Aluminum Alloy Plate material wiped clean；
C, using argon gas as protective gas, the throughput of the protective gas is 20L/min~25L/min, passes through optical fiber
Laser carries out full penetration using negative defocus, and the negative defocus is -8mm~-2mm, by limiting the weldering in welding process
Wiring energy is so that forming cross section after the completion of welding is the weld seam for following closely shape；Wherein, weld heat input 400J/mm.
In the present embodiment, the ingredient of Aluminum Alloy Plate material as mass fraction, Cu:0.15%~0.4%, Mn:
0.15%, Mg:0.8%~0.12%, Zn:0.25%, Cr:0.04%~0.35%, Ti:0.15%, Si:0.4%~
0.8%, Fe:0.7%, surplus Al.
Embodiment 3
In this present embodiment, the laser penetration welding procedure of a kind of Aluminum Alloy Plate material, comprising the following steps:
A, Aluminum Alloy Plate material is selected, with a thickness of 6mm；
B, with the cotton with acetone by Aluminum Alloy Plate material wiped clean；
C, using argon gas as protective gas, the throughput of the protective gas is 20L/min~25L/min, passes through optical fiber
Laser carries out full penetration using negative defocus, and the negative defocus is -8mm~-2mm, by limiting the weldering in welding process
Wiring energy is so that forming cross section after the completion of welding is the weld seam for following closely shape；Wherein, weld heat input 800J/mm.
In the present embodiment, the ingredient of Aluminum Alloy Plate material as mass fraction, Cu:0.15%~0.4%, Mn:
0.15%, Mg:0.8%~0.12%, Zn:0.25%, Cr:0.04%~0.35%, Ti:0.15%, Si:0.4%~
0.8%, Fe:0.7%, surplus Al.
The above embodiments only describe the basic principles and characteristics of the invention, and the present invention is not limited by above-described embodiment,
Without departing from the spirit and scope of the present invention, the invention also has various changes and changes, and these changes and changes are all fallen
Enter in scope of the claimed invention.The claimed scope of the invention is defined by the following claims.
Claims (6)
1. a kind of laser penetration welding procedure of Aluminum Alloy Plate material, it is characterised in that: the following steps are included:
A, Aluminum Alloy Plate material is selected, with a thickness of 6mm；
B, with the cotton with acetone by Aluminum Alloy Plate material wiped clean；
C, using argon gas as protective gas, full penetration is carried out using negative defocus by laser, by limiting welding process
In weld heat input so that welding after the completion of formed cross section be nail shape weld seam；Wherein, weld heat input is lower than
1064J/mm。
2. a kind of laser penetration welding procedure of Aluminum Alloy Plate material according to claim 1, it is characterised in that: aluminium closes
The ingredient of golden medium-thick plate as mass fraction, Cu:0.15%~0.4%, Mn:0.15%, Mg:0.8%~0.12%, Zn:
0.25%, Cr:0.04%~0.35%, Ti:0.15%, Si:0.4%~0.8%, Fe:0.7%, surplus Al.
3. a kind of laser penetration welding procedure of Aluminum Alloy Plate material according to claim 1, it is characterised in that: described
Weld heat input is 400J/mm~1000J/mm.
4. a kind of laser penetration welding procedure of Aluminum Alloy Plate material according to claim 1, it is characterised in that: described
The throughput of protective gas is 20L/min~25L/min.
5. a kind of laser penetration welding procedure of Aluminum Alloy Plate material according to claim 1, it is characterised in that: described
Negative defocus is -8mm~-2mm.
6. a kind of laser penetration welding procedure of Aluminum Alloy Plate material according to any one of claims 1 to 5, feature
Be: the laser is optical fiber laser.
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