CN115945783A - TRIP steel-aluminum alloy laser welding method with titanium/nickel composite intermediate layer - Google Patents
TRIP steel-aluminum alloy laser welding method with titanium/nickel composite intermediate layer Download PDFInfo
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Abstract
The invention provides a TRIP steel-aluminum alloy laser welding method with a titanium/nickel composite intermediate layer, which comprises the following steps: polishing, cleaning and drying the surfaces of the lap joint parts of the aluminum alloy sheet to be welded and the TRIP800 steel sheet; the aluminum alloy sheet is horizontally lapped together below the TRIP800 steel sheet and above the aluminum alloy sheet, and a composite middle layer is clamped in a lapping area and consists of a lower pure nickel metal sheet and an upper pure titanium metal sheet; and adjusting the movement path of the laser welding equipment and a preset welding line to the same straight line, setting welding parameters, and performing laser welding on the aluminum alloy sheet and the lap joint area of the TRIP800 steel sheet. The TRIP steel-aluminum alloy laser welding method with the titanium/nickel composite intermediate layer can effectively inhibit excessive generation of brittle intermetallic compounds at the welding joint, optimize the mechanical property of the welding joint, improve the connectivity of steel-aluminum dissimilar metals, and simplify the welding process.
Description
Technical Field
The invention relates to the field of laser welding of dissimilar materials, in particular to a TRIP steel-aluminum alloy laser welding method with a titanium/nickel composite intermediate layer.
Background
TRIP Steel, namely Transformation Induced Plasticity (Transformation Induced Plasticity) Steel, induces martensite nucleation of residual austenite in a Steel plate under the action of plastic deformation through a Transformation Induced Plasticity effect, introduces a Transformation strengthening mechanism and a plastic growth mechanism, and improves the strength and the toughness of the Steel plate. Since the discovery of the TRIP effect, efforts have been made worldwide to develop high quality TRIP steels for commercial use. TRIP steel developed in the sixties of the last century is added with excessive alloy elements, so that the manufacturing cost is high, a complex heat treatment process is required for obtaining more stable residual austenite, and the TRIP steel obtained by production cannot be applied to large-size workpieces and welding parts due to the limitation of the current conditions, so that the application of the TRIP steel is greatly limited. In the eighties of the twentieth century, the TRIP effect was also found in low alloy steels, and steels that could still produce TRIP effect after continuous annealing were produced, making it possible to apply TRIP steels in the automotive field.
TRIP steel has a multi-phase structure, which is a mixture of soft-phase ferrite, hard-phase bainite and metastable retained austenite, so that the retained austenite is transformed into martensite gradually during deformation. The TRIP steel has excellent mechanical property due to the structure property, high strength and high plasticity. Ferrite is a soft phase structure, and can deform bainite in the stretching process, and the bainite can improve the strength of the TRIP steel; austenite transforms into martensite when stretched at room temperature, and the martensite undergoes stress relaxation during the phase transformation, so that plasticity increases. The martensite generated by the transformation can strengthen the TRIP steel and increase the strength of the TRIP steel. TRIP800 is another outstanding task in the study of TRIP steel in saddle steels; belongs to TRIP steel with higher strength. Compared with other high-strength steels, the TRIP800 has the greatest characteristics of high strength and high extensibility, and can be used for punching more complex parts; and also has high impact absorption performance, and absorbs energy through self deformation without transmitting to the outside once encountering impact. Therefore, the anti-collision rubber is commonly used in the fields of automobile body lightening, rail transit and the like, such as the anti-collision parts of bumpers, automobile chassis, A, B columns and the like of automobiles. 6061 aluminum alloy is widely used in a variety of service conditions due to its manufacturability and excellent manufacturing properties. The aluminum alloy has good mechanical property, strong corrosion resistance, high weight-strength ratio and excellent formability, is vital to weight-reducing materials of vehicles such as airplanes, automobiles, high-speed rails and the like, and has wide application value in the fields of automobile industry and rail transit.
In recent years, with the development of the world economy, the automobile manufacturing industry has become the backbone industry of major economies of all industries. However, the development of the automobile manufacturing industry brings more attention to environmental problems and safety problems of automobiles. The main emissions of nitrogen oxides, hydrocarbons, carbon monoxide and Particulate Matter (PM) from automobiles have proven to be one of the important sources of pollution in the air. The state energy commission experts have shown that automobile exhaust emissions have surpassed coal pollution as the leading source of atmospheric pollution. Therefore, energy conservation, emission reduction, environmental pollution reduction and safety improvement become the most important development targets of the modern automobile industry, and one of the important means for realizing the targets is to realize the light weight of the automobile. In addition, no matter the vehicle is a mature fuel vehicle or a new energy vehicle, in order to reduce energy consumption and improve endurance, the vehicle body is inevitably developed in the next step. According to the knowledge, the fuel efficiency can be improved by 6-8% when the whole vehicle mass of the automobile is reduced by 10%; and every time the mass of the spare parts of the whole automobile is reduced by 100kg, the oil consumption of one hundred kilometers can be reduced by 0.3-0.6L, so the light weight of the automobile is greatly supported by the main automobile production countries in the world, the reduction of the automobile steel plate parts occupying more than half of the weight of the automobile body is one of the important ways for reducing the oil consumption of the automobile, and meanwhile, the weight of the automobile body can be effectively reduced by using novel aluminum alloy and the like as automobile covering parts and automobile body structural parts. The TRIP high-strength steel which is used as an automobile body material to realize the light weight of an automobile is a key development trend of the modern automobile manufacturing industry, has high strength, high extensibility and high collision absorption performance, and can be used for a plurality of structural members such as an A column, a B column, a front side beam, an anti-collision beam, a floor beam, wheels and the like of the automobile body. Therefore, TRIP high-strength steel and aluminum alloy have attracted much attention as the material of choice for reducing weight of automobiles, and dissimilar material joining between these two materials has attracted considerable attention.
At present, the main problems of dissimilar metals of aluminum alloy/TRIP steel in welding are that the difference of crystal structures and physical and chemical properties between aluminum and steel is large, iron is hardly dissolved in aluminum at normal temperature, brittle intermetallic compounds are easily generated at welding joints, and steel-aluminum intermetallic compounds have two fatal weaknesses, namely, the brittleness of materials is poor at low temperature; secondly, when the temperature exceeds 600 ℃, the strength and creep resistance of the material are sharply reduced. Therefore, how to control the generation and the size of the compound layer between the brittle and hard metals is an urgent problem to be solved for realizing the laser welding of dissimilar metals of aluminum alloy and TIRP steel.
In order to solve the above problems, people are always seeking an ideal technical solution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a TRIP steel-aluminum alloy laser welding method which can effectively inhibit excessive generation of brittle intermetallic compounds at a welding joint, optimize the mechanical property of the welding joint, improve the connectivity of steel-aluminum dissimilar metals and simplify the welding process and is added with a titanium/nickel composite intermediate layer.
In order to achieve the purpose, the invention adopts the technical scheme that: a TRIP steel-aluminum alloy laser welding method with a titanium/nickel composite intermediate layer comprises the following steps:
s1, polishing, cleaning and drying the surface of the lap joint part of an aluminum alloy sheet to be welded and a TRIP800 steel sheet to ensure that no metal oxide film, oil stain and moisture exist in the area to be welded;
s2, horizontally lapping the aluminum alloy sheet and the TRIP800 steel sheet together at the lower part and the upper part, and clamping a composite middle layer in a lapping area, wherein the composite middle layer consists of a lower pure nickel metal sheet and an upper pure titanium metal sheet;
and S3, adjusting the movement path of the laser welding equipment and a preset welding line to be on the same straight line, setting welding parameters, and performing laser welding on the lap joint area of the aluminum alloy sheet and the TRIP800 steel sheet.
Based on the above, the radius of the laser spot is 1-2mm, the welding power is 1200-1400W, the welding speed is 16-20 mm/s, and the defocusing amount is-1, 0 and +1.
Based on the above, the welding parameters in step S3 are: the radius of a laser spot is 1mm, the welding power is 1300W, the welding speed is 18mm/s, and the defocusing amount is 0.
Based on the above, in step S2, the thickness of each of the pure nickel metal sheet and the pure titanium metal sheet is 0.05mm, and the purity thereof is 99.99%.
Based on the above, in the step S2, a special fixture is adopted to clamp the aluminum alloy sheet and the TRIP800 steel sheet, the special fixture includes a base, two pressing plates and a gasket, the top surface of the base is of a planar structure, a groove is formed in the center of the base, the two pressing plates are located on two sides of the groove, two studs are arranged at two ends of the base corresponding to each pressing plate, the pressing plate is provided with two through holes corresponding to the two studs, each stud is provided with a nut for pressing the pressing plate, and the thickness of the gasket is the same as that of the aluminum alloy sheet;
in the clamping process, the aluminum alloy sheet is directly placed on one side of the top surface of the base, and the side pressure plate tightly presses the aluminum alloy sheet; placing the gasket on the other side of the top surface of the base, placing the TRIP800 steel thin plate on the gasket, and pressing the TRIP800 steel thin plate by using the side pressing plate to ensure that the TRIP800 steel thin plate is horizontally lapped; the weld of the overlap region falls directly over the groove.
Based on the above, in step S2, the material of the gasket is TRIP800 steel.
Based on the above, step S1 includes the following substeps:
sequentially using 800-mesh, 1500-mesh and 2000-mesh sand paper to polish the surfaces of the lap joint areas of the aluminum alloy sheet and the TRIP800 steel sheet;
putting the polished aluminum alloy sheet and the polished TRIP800 steel sheet into an ultrasonic instrument cleaning instrument for cleaning;
and taking out the aluminum alloy sheet and the TRIP800 steel sheet, cleaning the surfaces with acetone, and drying with a blower by cold air.
Based on the above, when the ultrasonic instrument cleaning instrument is used for cleaning, the solution is absolute ethyl alcohol, the cleaning time is 10min, and the temperature is 25 ℃.
Based on the above, the TRIP800 steel sheet comprises the following chemical components in percentage by mass: c is 0.011; si:0.121; mn:0.155; p is 0.012; s is 0.004; fe: the balance;
the aluminum alloy sheet is a 6061 aluminum alloy sheet, and the aluminum alloy sheet comprises the following chemical components in percentage by mass: mg:1.09; si:0.65; mn:0.052; fe:0.56; cr:0.2; zn:0.01; cu:0.28; ti:0.019; al: and (4) the balance.
Based on the above, the thickness of the TRIP800 steel sheet is 1.2mm, and the thickness of the aluminum alloy sheet is 2mm.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and particularly has the following advantages:
(1) The pure nickel metal sheet is in direct contact with the aluminum alloy sheet, ni element is diffused to the joint part of the steel-aluminum welding joint under the impact of high laser energy density to form a Ni-Al binary toughness phase, and meanwhile, the pure nickel metal sheet can improve the diffusion degree of Fe in Al and inhibit the mass production of brittle intermetallic compounds at the interface; the pure titanium metal sheet is in direct contact with the TRIP800 steel sheet, and in a molten state, ti atoms preferentially replace Al atoms in the FeAl compound to form Fe with ductility 2 The Ti compound reduces the brittleness of the welding joint and improves the tensile and shearing performance of the welding joint; ni-Al, fe are formed by the composite intermediate layer 2 The Ti and other mixed toughness phases greatly inhibit the generation of brittle Fe-Al metal compounds, thereby greatly improving the mechanical property of the welding joint.
Through experiments, the tensile and shearing performance of the weldment with the composite middle layer is improved by more than 35% compared with that of the weldment without the middle layer, is improved by more than 18% compared with that of the weldment with the pure nickel middle layer with the same thickness, and is improved by more than 22% compared with that of the weldment with the pure titanium middle layer with the same thickness.
(2) The method has the advantages of no splashing in the welding process, stable and neat welding seams, no collapse, small deformation of a weldment, small grain structure of a welding joint and narrow heat affected zone.
Drawings
FIG. 1 is a schematic view of clamping and welding an aluminum alloy thin plate and a TRIP800 steel thin plate according to the present invention.
FIG. 2 is a schematic view of welding of an aluminum alloy sheet and a TRIP800 steel sheet according to the present invention.
Fig. 3 is a surface image of a weld of an aluminum alloy sheet and a TRIP800 steel sheet welded by the method of the present invention.
Fig. 4 is a cross-sectional image of a weld of an aluminum alloy sheet and a TRIP800 steel sheet welded by the method of the present invention.
In the figure: 1. an aluminum alloy sheet; 2. TRIP800 steel sheet; 3. a base; 4. pressing a plate; 5. a gasket; 6. a groove; 7. a stud; 8. a nut; 9. a pure nickel metal sheet; 10. a pure titanium metal sheet; 11. laser welding equipment; 12. and presetting a welding seam.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
As shown in fig. 1 and 2, the objects to be welded in the present embodiment are an aluminum alloy thin plate 1 and a TRIP800 steel thin plate 2, in which:
the aluminum alloy sheet 1 adopts a 6061 aluminum alloy sheet, and the size is as follows: length × width × thickness =100 × 50 × 2mm; the chemical components in percentage by mass are as follows: mg:1.09; si:0.65; mn:0.052; fe:0.56; cr:0.2; zn:0.01; cu:0.28; ti:0.019; al: and (4) the balance.
The dimensions of the TRIP800 steel sheet 2 are as follows: length × width × thickness =100 × 50 × 1.2mm; the chemical components in percentage by mass are as follows: c is 0.011; si:0.121; mn:0.155; p is 0.012; s is 0.004; fe: and the balance.
The special fixture is adopted for clamping and comprises a base 3, two pressing plates 4 and a gasket 5, wherein the top surface of the base 3 is of a planar structure, a groove 6 is formed in the center of the base, the two pressing plates 4 are located on two sides of the groove 6, the base 3 corresponds to each pressing plate, two studs 7 are arranged at two ends of each pressing plate 4, the pressing plates 4 correspond to the two studs 7 and are provided with two through holes, each stud 7 is provided with a nut 8 used for pressing the pressing plates 4, and the thickness of the gasket 5 is the same as that of the aluminum alloy sheet 1.
A TRIP steel-aluminum alloy laser welding method with a titanium/nickel composite intermediate layer comprises the following steps:
step S1, pretreatment before welding, comprising the following substeps:
sequentially using 800-mesh, 1500-mesh and 2000-mesh sandpaper to polish the surfaces of the lap joint areas of the aluminum alloy sheet 1 and the TRIP800 steel sheet 2, and removing metal oxide films, burrs and oil stains on the surfaces;
putting the polished aluminum alloy sheet 1 and the polished TRIP800 steel sheet 2 into an ultrasonic instrument cleaning instrument for cleaning, wherein the solution is absolute ethyl alcohol, the cleaning time is 10min, the temperature is 25 ℃, and fine stains on the surface are removed;
taking out the aluminum alloy sheet 1 and the TRIP800 steel sheet 2, cleaning residual ethanol on the surfaces by using acetone, and drying by using a blower with cold air; and the metal oxide film, oil stain and water are not generated in the lap joint area.
S2, clamping the aluminum alloy sheet 1 and the TRIP800 steel sheet 2 by using the special clamp:
firstly, directly placing the aluminum alloy sheet 1 on one side of the top surface of the base 3, and tightly pressing the aluminum alloy sheet 1 by the side pressing plate 4;
stacking a pure nickel metal sheet 9 on the upper surface of the lap joint area of the aluminum alloy sheet 1, stacking a pure titanium metal sheet 10 on the upper surface of the pure nickel metal sheet 9, wherein the pure nickel metal sheet 9 and the pure titanium metal sheet 10 are both 0.05mm in thickness and 99.99% in purity, and the pure nickel metal sheet 9 and the pure titanium metal sheet are combined to form a composite middle layer;
placing the gasket 5 on the other side of the top surface of the base 3, placing the TRIP800 steel thin plate 2 on the gasket 5, and then pressing the TRIP800 steel thin plate 2 by using the side pressure plate 4 to ensure that the TRIP800 steel thin plate 2 is horizontally overlapped, so that the aluminum alloy thin plate 1, the composite intermediate layer and the TRIP800 steel thin plate 2 are in close contact, wherein the gasket 5 is preferably made of TRIP800 steel to eliminate additional interference;
after the lap joint is finished, the welding seam of the lap joint area falls right above the groove 6.
S3, laser welding is carried out by using laser welding equipment 11, wherein the laser welding equipment is a YLR-2000-MM-WC optical fiber laser welding device, the rated power range is 200W-2000W, and the rated voltage is 230V:
adjusting the movement path of the laser welding equipment 11 and a preset welding line 12 to be on the same straight line, setting welding parameters, and performing laser welding on the lap joint area of the aluminum alloy sheet 1 and the TRIP800 steel sheet 2;
the specific welding parameters may be: the radius of a laser spot is 1-2mm, the welding power is 1200W-1400W, the welding speed is 16mm/s-20mm/s, the defocusing amount is-1, 0 and +1, the used protective gas is inert gas argon with the purity of 99.99%, and the flow of the protective gas is 15-20L/min.
Preferably, the welding parameters are: the radius of a laser spot is 1mm, the welding power is 1300W, the welding speed is 18mm/s, and the defocusing amount is 0.
In the welding method, laser deep fusion welding is adopted, so that the TRIP800 steel sheet 2 on the upper layer is completely melted through, and the aluminum alloy sheet 1 on the lower layer is partially melted to form a slender 'nail head' -shaped small-hole molten pool. The welding method realizes the high-quality connection of the TRIP800 steel sheet 2 and the aluminum alloy sheet 1 by using different materials, as shown in figure 3, no splash exists in the welding process, the welding line is stable, neat and free from collapse, and the deformation of a weldment is small; as shown in FIG. 4, the welded joint has a fine grain structure and a narrow heat affected zone.
Through experiments, the pulling and shearing force of the TRIP steel-aluminum alloy weldment prepared by the TRIP steel-aluminum alloy laser welding method added with the titanium/nickel composite intermediate layer can reach 1569.79N in the pulling and shearing experiment. The applicant also carries out experiments on the TRIP steel-aluminum alloy which is not added with the intermediate layer, adopts a pure nickel metal sheet with the thickness of 0.1mm as the intermediate layer and adopts a pure titanium metal sheet with the thickness of 0.1mm as the intermediate layer under the condition of the same welding parameters and the same other welding conditions, the tensile shear performance of the TRIP steel-aluminum alloy is 1140.57N, 1312.62N and 1263.23N in sequence, and the shearing resistance performance of the welding method is respectively improved by 37.632%, 19.592% and 24.268% compared with the shearing resistance performance of the TRIP steel-aluminum alloy.
The action principle is as follows:
through research, the pure nickel metal sheet 9 and the pure titanium metal sheet 10 are used as composite intermediate layers, so that the mechanical property of an overlap joint can be effectively improved, specifically, the pure nickel metal sheet 9 is in direct contact with the aluminum alloy thin plate 1, under the impact of high laser energy density, ni element is diffused to a steel-aluminum welding joint part to form a Ni-Al binary toughness phase, and meanwhile, the pure nickel metal sheet 9 can improve the diffusion degree of Fe in Al and inhibit the mass production of brittle intermetallic compounds at an interface; the pure titanium metal sheet 10 is in direct contact with the TRIP800 steel thin plate 2, and in a molten state, ti atoms preferentially replace Al atoms in the FeAl compound to form Fe with ductility 2 The Ti compound reduces the brittleness of the welding joint and improves the tensile and shearing performance of the welding joint; ni-Al, fe are formed by the composite intermediate layer 2 The Ti and other mixed toughness phases greatly inhibit the generation of brittle Fe-Al metal compounds, thereby greatly improving the mechanical property of the welding joint.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications of the embodiments of the invention or equivalent substitutions for parts of the technical features are possible; without departing from the spirit of the invention, it is intended to cover all modifications within the scope of the invention as claimed.
Claims (10)
1. A TRIP steel-aluminum alloy laser welding method added with a titanium/nickel composite intermediate layer is characterized by comprising the following steps:
s1, polishing, cleaning and drying the surface of the lap joint part of an aluminum alloy sheet to be welded and a TRIP800 steel sheet to ensure that no metal oxide film, oil stain and moisture exist in the area to be welded;
s2, horizontally lapping the aluminum alloy sheet and the TRIP800 steel sheet together at the lower part and the upper part, and clamping a composite middle layer in a lapping area, wherein the composite middle layer consists of a lower pure nickel metal sheet and an upper pure titanium metal sheet;
and S3, adjusting the movement path of the laser welding equipment and a preset welding line to be on the same straight line, setting welding parameters, and performing laser welding on the lap joint area of the aluminum alloy sheet and the TRIP800 steel sheet.
2. The TRIP steel-aluminum alloy laser welding method added with the titanium/nickel composite intermediate layer as claimed in claim 1, wherein the welding parameters in step S3 are: the radius of a laser spot is 1-2mm, the welding power is 1200-1400W, the welding speed is 16-20 mm/s, and the defocusing amount is-1, 0 and +1.
3. The TRIP steel-aluminum alloy laser welding method added with the titanium/nickel composite intermediate layer as claimed in claim 2, wherein the welding parameters in the step S3 are: the radius of a laser spot is 1mm, the welding power is 1300W, the welding speed is 18mm/s, and the defocusing amount is 0.
4. The TRIP steel-aluminum alloy laser welding method with the addition of the titanium/nickel composite intermediate layer according to any one of claims 1 to 3, characterized in that: in step S2, the thickness of the pure nickel metal sheet and the thickness of the pure titanium metal sheet are both 0.05mm, and the purity of the pure nickel metal sheet and the purity of the pure titanium metal sheet are both 99.99%.
5. The TRIP steel-aluminum alloy laser welding method added with the titanium/nickel composite interlayer as claimed in claim 4, wherein: step S2, clamping the aluminum alloy sheet and the TRIP800 steel sheet by using a special clamp, wherein the special clamp comprises a base, two pressing plates and a gasket, the top surface of the base is of a planar structure, a groove is formed in the center of the base, the two pressing plates are positioned on two sides of the groove, two studs are arranged at two ends of the base corresponding to each pressing plate, two through holes are formed in the pressing plates corresponding to the two studs, each stud is provided with a nut used for pressing the pressing plate tightly, and the thickness of the gasket is the same as that of the aluminum alloy sheet;
in the clamping process, the aluminum alloy sheet is directly placed on one side of the top surface of the base, and the side pressure plate tightly presses the aluminum alloy sheet; placing the gasket on the other side of the top surface of the base, placing the TRIP800 steel thin plate on the gasket, and pressing the TRIP800 steel thin plate by using the side pressing plate to ensure that the TRIP800 steel thin plate is horizontally lapped; the weld of the overlap region falls directly over the groove.
6. The TRIP steel-aluminum alloy laser welding method added with the titanium/nickel composite interlayer as claimed in claim 5, wherein: in step S2, the gasket is made of TRIP800 steel.
7. The laser welding method of TRIP steel-aluminum alloy with addition of titanium/nickel composite interlayer according to any of claims 1, 2, 3, 5 and 6, characterized in that step S1 comprises the following substeps:
sequentially using 800-mesh, 1500-mesh and 2000-mesh sand paper to polish the surfaces of the lap joint areas of the aluminum alloy sheet and the TRIP800 steel sheet;
putting the polished aluminum alloy sheet and the polished TRIP800 steel sheet into an ultrasonic instrument cleaning instrument for cleaning;
and taking out the aluminum alloy sheet and the TRIP800 steel sheet, cleaning the surfaces with acetone, and drying with a blower by cold air.
8. The TRIP steel-aluminum alloy laser welding method added with the titanium/nickel composite interlayer as claimed in claim 7, wherein: when the ultrasonic instrument cleaning instrument is cleaned, the solution is absolute ethyl alcohol, the cleaning time is 10min, and the temperature is 25 ℃.
9. The TRIP steel-aluminum alloy laser welding method with the addition of a titanium/nickel composite interlayer according to any one of claims 1, 2, 3, 5, 6 and 8, wherein: the TRIP800 steel sheet comprises the following chemical components in percentage by mass: c is 0.011; si:0.121; mn:0.155; p is 0.012; s is 0.004; fe: the balance;
the aluminum alloy sheet is a 6061 aluminum alloy sheet, and the aluminum alloy sheet comprises the following chemical components in percentage by mass: mg:1.09; si:0.65; mn:0.052; fe:0.56; cr:0.2; zn:0.01; cu:0.28; ti:0.019; al: and (4) the balance.
10. The TRIP steel-aluminum alloy laser welding method added with a titanium/nickel composite interlayer as claimed in claim 9, wherein: the thickness of the TRIP800 steel sheet is 1.2mm, and the thickness of the aluminum alloy sheet is 2mm.
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