A diamond particle reinforced aluminum alloy cored wire and a laser welding method thereof

Abstract

The application discloses a kind of diamond particle reinforced aluminum alloy cored wire, using commercial common 6061 series aluminum alloy powder as matrix material, add the metal powder that can form carbide, use diamond as reinforcing phase, add graphite powder as lubricant, the above raw materials are mixed, using 6061 aluminum alloy or pure aluminum hollow pipe material as cored wire package cover, after rolling annealing, diamond particle reinforced aluminum alloy cored wire is obtained.The application also discloses a kind of laser welding method of the diamond particle reinforced aluminum alloy cored wire, by combining laser welding with cored wire welding technology, a new way is opened for the application of aluminum alloy and its composite in complex environment.The method of the application can significantly improve the strength, wear resistance and heat conduction performance of aluminum alloy welded parts, and provide a more high-quality welding solution for the high-end manufacturing field of aerospace, automobile manufacturing, etc.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of aluminum alloy welding wire and welding technology, and particularly relates to a diamond particle reinforced aluminum alloy flux cored wire and a laser welding method thereof. BACKGROUND

[0002] Aluminum alloy materials are widely used in aerospace, automotive manufacturing and electronic packaging due to their light weight, high strength and corrosion resistance. However, due to the high thermal conductivity and high reflectivity of aluminum alloy, defects such as oxidation, porosity and cracks are easily generated during the welding process. These problems seriously affect the weld quality and service life of the welded parts. Therefore, how to effectively improve the welding performance of aluminum alloy, especially the density and strength of the weld, has always been the focus and difficulty in welding process research.

[0003] Laser welding has become an ideal choice for aluminum alloy welding due to its high energy density, fast welding speed and small heat-affected zone. However, due to the special properties of aluminum alloy (such as high reflectivity and instability of the molten pool), traditional laser welding often faces problems such as insufficient penetration, porosity and crack generation, which limits its use in complex structural parts, especially in the welding of irregular aluminum alloy plates. SUMMARY

[0004] One of the purposes of the present application is to provide a diamond particle reinforced aluminum alloy flux cored wire that not only effectively fills the weld, but also stabilizes the molten pool, reduces porosity and improves welding quality. At the same time, the Si in the alloy can react with the diamond to generate SiC in situ to enhance the interface bonding.

[0005] The second purpose of the present application is to provide a preparation method of the diamond particle reinforced aluminum alloy flux cored wire.

[0006] The second purpose of the present application is to provide a laser welding method of the diamond particle reinforced aluminum alloy flux cored wire.

[0007] The present application provides a diamond particle reinforced aluminum alloy flux cored wire, the flux cored raw material comprising 6061 aluminum alloy powder, metal powder, diamond and graphite powder, wherein the mass fraction of diamond is 1-10wt%, preferably 3-5wt%; the mass fraction of metal powder is 0.1-2wt%, preferably 0.1-1wt%; the mass fraction of graphite powder is 0.1-1wt%, preferably 0.5-1wt%, and the balance is 6061 aluminum alloy powder.

[0008] Further, the 6061 aluminum alloy powder is spherical powder with a particle size of 1-20 microns, preferably 5-8 microns.

[0009] Further, the metal powder is one or more of Cr, V, Ti, Mo spherical powder, and the particle size of the powder is 1-20 microns, preferably 8-10 microns.

[0010] Further, the diamond is single crystal or polycrystalline micro powder, and the particle size is 0.5-10 microns, preferably 1-5 microns.

[0011] The graphite powder is spherical graphite or flaky graphite, and the particle size of the powder is 0.5-5 microns, preferably 0.5-1.2 microns.

[0012] The present application provides a preparation method of the diamond particle reinforced aluminum alloy cored wire, comprising the following steps:

[0013] S1. According to the above formula, the raw materials are weighed, ball-milled and mixed, and then the powder is filled into a hollow tube made of 6061 aluminum alloy or pure aluminum material as a cored wire sheath to obtain a cored wire.

[0014] S2. The cored wire obtained in step S1 is rolled, annealed and drawn to obtain the diamond particle reinforced aluminum alloy cored wire.

[0015] Further, the ball-milling is planetary ball-milling, the ball-milling speed is 50-100 rpm, the ball-milling time is 5-20 h, the ball-to-material ratio is (10-20):1, argon is used as a protective atmosphere during ball-milling, alcohol is used as a ball-milling medium, and the mixed powder is vacuum dried after ball-milling at 70-120℃ for 1-3 hours to remove residual alcohol.

[0016] Further, in step S1, the powder is filled into a pure aluminum tube or a 6061 aluminum alloy tube with a circumference of 5-20 mm and a thickness of 0.2-1.2 mm, and the powder filling degree is 20%-40%.

[0017] Preferably, the powder is filled into a pure aluminum tube or a 6061 aluminum alloy tube with a circumference of 10-15 mm and a thickness of 0.5-1 mm, and the powder filling degree is 24%-36%.

[0018] Further, in step S2, the cored wire obtained in step S1 is rolled for several times, the rolling pass is 5-10 times, the single pass deformation is 15%-20%, and the final rolling deformation is 80%-90%; then annealing treatment is carried out at a temperature of 300-450℃ for 0.5-2 h under an argon protective environment, and finally several times of drawing is carried out, annealing is carried out multiple times during the drawing process, the annealing temperature is in the range of 400-500℃, and the annealing time is 1-3 h to obtain the diamond particle reinforced aluminum alloy cored wire.

[0019] Further, the diameter of the diamond particle reinforced aluminum alloy cored wire is 0.5-2 mm.

[0020] The application also provides a laser welding method of the diamond particle reinforced aluminum alloy cored wire, comprising the following steps:

[0021] S11. Obtain a special-shaped aluminum alloy plate and clean it;

[0022] S12. Use laser melting welding to weld the special-shaped aluminum alloy plate by using the diamond particle reinforced aluminum alloy cored wire as a welding wire.

[0023] Further, in step S11, acetone is used to clean the surface of the aluminum alloy plate to remove oil stains and oxides.

[0024] Further, in step S12, the laser welding machine used is a fiber laser; the laser power used is 1kw-10kw, the welding speed is 10-120mm / s, the welding focal point position deviates from the surface by 0-1mm, the feeding speed of the welding wire is 5-100mm / s, and the incident angle of the welding wire is 10-45°.

[0025] Preferably, the laser power used is 3kw-6kw, the welding speed is 80-120mm / s, the welding focal point position deviates from the surface by 0.5mm, the feeding speed of the welding wire is 60-100mm / s, and the incident angle of the welding wire is 10-45°.

[0026] Further, high-purity argon or high-purity helium with a concentration range of 99.5%-99.99% is used during the laser welding process, and the gas flow is 15-20L / min.

[0027] The application has the following beneficial effects:

[0028] (1) The Si in the 6061 aluminum alloy in the aluminum alloy cored wire disclosed in the application can react with the diamond in situ to generate a SiC reinforced interface during the welding process; the diamond itself has the characteristics of high strength, high wear resistance and high thermal conductivity, which can significantly enhance the strength and wear resistance of the weld; the high thermal conductivity of the diamond allows heat to be rapidly conducted during the welding process, avoiding excessive concentration of high-temperature areas and reducing deformation and cracking problems caused by thermal stress; the tight interface bonding helps to further apply the load and thermal conductivity of the diamond, reduces the risk of thermal stress and deformation, makes the weld more uniform, and reduces the cracking and deformation of the welded part; compared with traditional welding materials, the weld shows better mechanical properties, prolonging the service life of the welded part;

[0029] (2) The welding method disclosed by the application has high energy density and high-speed welding capacity, and the high thermal conductivity of the diamond particles in the cored wire and the trace amount of carbide forming elements can ensure that the welding can be completed in a short time during the welding process, and carbide particles are generated during the welding process, which can change the fluidity of the molten pool, help stabilize the molten pool, and reduce the formation of pores and cracks during the welding process; the carbide layer formed by titanium (Ti) and chromium (Cr) can also improve the wettability of the welding molten pool, ensure the uniformity and density of the molten pool. At the same time, these carbide elements can improve the corrosion resistance of the material; in addition, compared with traditional arc welding (such as TIG and MIG), the heat-affected zone (HAZ) of laser welding is smaller, which helps to reduce material damage and improve welding efficiency. Laser welding is suitable for complex-shaped special-shaped aluminum alloy plates and thin-walled structures;

[0030] (3) The weld hardness welded by the method of the application is ≥120HV, the weld strength is ≥310MPa, the thermal conductivity is ≥150W / m·K, and the wear rate is ≤6×10 -6 mm 3 / N·m. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 SEM morphology of the pure aluminum / diamond cored wire obtained in Example 1;

[0032] Figure 2 SEM morphology of the 6061 aluminum alloy / diamond cored wire obtained in Example 6. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present application, the following will combine the embodiments to describe the present application more comprehensively and in detail, but the protection scope of the present application is not limited to the following specific embodiments.

[0034] Unless otherwise specified, all reagents and raw materials used in the present application are commercially available or can be prepared by known methods.

[0035] Example 1

[0036] According to the following formula, the raw materials are weighed: the mass fraction of diamond particles is 3wt%, the mass fraction of Cr powder is 0.1wt%, the mass fraction of flaky graphite is 0.1wt%, and the balance is 6061 aluminum alloy powder.

[0037] Among them, the particle size of diamond is 8 microns, the particle size of Cr powder is 5 microns, the particle size of flaky graphite is 5 microns, and the particle size of 6061 aluminum alloy is 10 microns.

[0038] The above raw materials were uniformly mixed, ball-milled for 5 hours using a planetary ball mill at a ball milling speed of 50 rpm and a ball-to-material ratio of 10:1, the whole ball milling process was protected by argon gas with a purity of 99.5%, and alcohol was used as the ball milling medium. After ball milling, the mixed powder was placed in a vacuum drying oven and dried at 90°C for 2 hours to remove residual alcohol, thereby obtaining a mixed powder.

[0039] The obtained mixed powder was filled into a pure aluminum hollow tube with a circumference of 12 mm and a thickness of 1 mm, the powder filling degree was 24%, and then rolling was performed, the rolling pass was 8 times, and the final deformation was 90%, and after rolling, annealing treatment was performed at a temperature of 350°C for 2h. Then, drawing treatment was performed, and multiple intermediate annealing (450°C, 2h) treatment was performed to improve formability, and the final welding wire diameter was 1.2mm.

[0040] The obtained welding wire was a pure aluminum / diamond cored wire, and the SEM morphology was observed using a scanning electron microscope, as shown in Figure 1 .

[0041] The obtained welding wire was used to laser melt and weld an aluminum alloy plate with special shape, and the surface of the aluminum alloy plate was cleaned using acetone before welding to remove oil stains and oxides. The laser power used was 3kw, the welding speed was 100mm / s, the welding focal point position was offset from the surface by 0.5mm, the depth and stability of the molten pool were ensured, the feeding speed of the welding wire was 60mm / s, and the incident angle of the welding wire was 20°. High-purity argon gas was used as the protective gas during laser welding, and the gas flow rate was 20L / min.

[0042] Example 2

[0043] The raw materials were weighed according to the following formula: the mass fraction of diamond particles was 5wt%, the mass fraction of Cr powder was 0.5wt%, the mass fraction of flaky graphite was 0.2wt%, and the balance was 6061 aluminum alloy powder.

[0044] Among them, the particle size of the diamond was 5 microns, the particle size of the Cr powder was 10 microns, the particle size of the flaky graphite was 5 microns, and the particle size of the 6061 aluminum alloy was 10 microns.

[0045] The above raw materials were uniformly mixed, ball-milled for 5 hours using a planetary ball mill at a ball milling speed of 50 rpm and a ball-to-material ratio of 10:1, the whole ball milling process was protected by argon gas with a purity of 99.5%, and alcohol was used as the ball milling medium. After ball milling, the mixed powder was placed in a vacuum drying oven and dried at 90°C for 2 hours to remove residual alcohol, thereby obtaining a mixed powder.

[0046] The obtained mixed powder was filled into a pure aluminum hollow tube with a circumference of 12 mm and a thickness of 1 mm, the powder filling degree was 30%, then rolling was performed, the rolling pass was 8 times, and the final deformation was 90%. After rolling, annealing treatment was performed at a temperature of 350°C for 2h. Then drawing treatment was performed, and multiple intermediate annealing (450°C, 2h) treatment was performed to improve formability, and the final welding wire diameter was 1.2mm.

[0047] The obtained welding wire was used to laser fusion weld the special-shaped aluminum alloy plate, and the surface of the aluminum alloy plate was cleaned with acetone before welding to remove oil stains and oxides. The laser power used was 3kw, the welding speed was 100mm / s, the welding focal point position was offset from the surface by 0.5mm, the depth and stability of the molten pool were ensured, the feeding speed of the welding wire was 60mm / s, and the welding wire incidence angle was 20°. High-purity argon was used as a protective gas during laser welding, and the gas flow rate was 20L / min.

[0048] Example 3

[0049] The raw materials were weighed according to the following formula: the mass fraction of diamond particles was 10wt%, the mass fraction of Ti powder was 0.5wt%, the mass fraction of flaky graphite was 0.2wt%, and the balance was 6061 aluminum alloy powder.

[0050] Among them, the particle size of diamond is 5 microns, the particle size of Ti powder is 10 microns, the particle size of flaky graphite is 5 microns, and the particle size of 6061 aluminum alloy is 10 microns.

[0051] The above raw materials were uniformly mixed, and a planetary ball mill was used for ball milling for 5 hours, the ball milling speed was 50rpm, the ball-to-material ratio was 10:1, pure argon with a purity of 99.5% was used for protection during the whole ball milling process, alcohol was used as the ball milling medium, and after ball milling, the mixed powder was placed in a vacuum drying oven and dried at 90°C for 2 hours to remove residual alcohol, obtaining the mixed powder.

[0052] The obtained mixed powder was filled into a pure aluminum hollow tube with a circumference of 12 mm and a thickness of 1 mm, the powder filling degree was 30%, then rolling was performed, the rolling pass was 8 times, and the final deformation was 90%. After rolling, annealing treatment was performed at a temperature of 450°C for 2h. Then drawing treatment was performed, and multiple intermediate annealing (450°C, 2h) treatment was performed to improve formability, and the final welding wire diameter was 1.0mm.

[0053] The obtained welding wire is used to laser fusion weld the special-shaped aluminum alloy plate. The surface of the aluminum alloy plate is cleaned with acetone before welding to remove oil stains and oxides. The laser power used is 3 kw, the welding speed is 100 mm / s, the welding focal point position deviates from the surface by 0.5 mm, the depth and stability of the molten pool are ensured, the feeding speed of the welding wire is 60 mm / s, and the incident angle of the welding wire is 20°. High-purity argon is used as the protective gas during laser welding, and the gas flow is 20 L / min.

[0054] Example 4

[0055] The raw materials are weighed according to the following formula: the mass fraction of diamond particles is 10wt%, the mass fraction of Cr powder is 1wt%, the mass fraction of flaky graphite is 0.2wt%, and the balance is 6061 aluminum alloy powder.

[0056] The particle size of the diamond is 5 microns, the particle size of the Cr powder is 5 microns, the particle size of the flaky graphite is 5 microns, and the particle size of the 6061 aluminum alloy is 10 microns.

[0057] The above raw materials are uniformly mixed, and a planetary ball mill is used for ball milling for 5 hours, the ball milling speed is 50 rpm, the ball-to-material ratio is 10:1, the purity of argon used for ball milling is 99.5%, alcohol is used as the ball milling medium, and after ball milling, the mixed powder is placed in a vacuum drying oven for drying at 90°C for 2 hours to remove residual alcohol, and the mixed powder is obtained.

[0058] The obtained mixed powder is filled into a pure aluminum hollow tube with a circumference of 12 mm and a thickness of 1 mm, the powder filling degree is 30%, and then rolling is performed, the rolling passes are 8 times, and the final deformation is 90%, and after rolling, annealing treatment is performed at a temperature of 350°C for 2h. Then, drawing treatment is performed, and multiple intermediate annealing (450°C, 2 hours) treatment is performed to improve formability, and the final welding wire diameter is 1.5mm.

[0059] The obtained welding wire is used to laser fusion weld the special-shaped aluminum alloy plate. The surface of the aluminum alloy plate is cleaned with acetone before welding to remove oil stains and oxides. The laser power used is 3 kw, the welding speed is 100 mm / s, the welding focal point position deviates from the surface by 0.5 mm, the depth and stability of the molten pool are ensured, the feeding speed of the welding wire is 60 mm / s, and the incident angle of the welding wire is 20°. High-purity argon is used as the protective gas during laser welding, and the gas flow is 20 L / min.

[0060] Example 5

[0061] The raw materials are weighed according to the following formula: the mass fraction of diamond particles is 3wt%, the mass fraction of Ti powder is 0.25wt%, the mass fraction of Cr powder is 0.25wt%, the mass fraction of flaky graphite is 0.2wt%, and the balance is 6061 aluminum alloy powder.

[0062] The particle size of the diamond is 2 microns, the particle size of the Ti powder and the Cr powder is 10 microns, the particle size of the flaky graphite is 5 microns, and the particle size of the 6061 aluminum alloy is 10 microns.

[0063] The above raw materials are uniformly mixed, and a planetary ball mill is used for ball milling for 5 hours, the ball milling speed is 50 rpm, the ball-to-material ratio is 10:1, pure argon gas with a purity of 99.5% is used for protection during the whole ball milling process, alcohol is used as the ball milling medium, and after ball milling, the mixed powder is placed in a vacuum drying oven for drying at 90°C for 2 hours to remove residual alcohol, and the mixed powder is obtained.

[0064] The obtained mixed powder is filled into a pure aluminum hollow tube with a circumference of 12 mm and a thickness of 0.8 mm, the powder filling degree is 30%, and then rolling is carried out, the rolling passes are 8 times, and the final deformation is 90%, and after rolling, annealing treatment is carried out at a temperature of 350°C for 2h. Then, drawing treatment is carried out, and multiple intermediate annealing (450°C, 2h) treatment is carried out to improve the formability, and the final welding wire diameter is 1.8mm.

[0065] The obtained welding wire is used for laser melting welding of special-shaped aluminum alloy plates, and the surface of the aluminum alloy plate is cleaned before welding using acetone to remove oil stains and oxides. The laser power used is 5kw, the welding speed is 110mm / s, the welding focal point position is offset from the surface by 0.5mm, the depth and stability of the molten pool are ensured, the feeding speed of the welding wire is 80mm / s, and the incident angle of the welding wire is 45°. High-purity argon gas is used as the protective gas during laser welding, and the gas flow is 20L / min.

[0066] Example 6

[0067] The raw materials are weighed according to the following formula: the mass fraction of diamond particles is 5wt%, the mass fraction of Cr powder is 0.5wt%, the mass fraction of flaky graphite is 0.2wt%, and the balance is 6061 aluminum alloy powder.

[0068] The particle size of the diamond is 5 microns, the particle size of the Cr powder is 5 microns, the particle size of the flaky graphite is 5 microns, and the particle size of the 6061 aluminum alloy is 10 microns.

[0069] The above raw materials were uniformly mixed, ball milled for 5 hours using a planetary ball mill at a rotation speed of 50 rpm, a ball-to-material ratio of 10:1, and using argon gas with a purity of 99.5% as a protective gas throughout the ball milling process, and using alcohol as a ball milling medium. After the ball milling, the mixed powder was placed in a vacuum drying oven and dried at 90°C for 2 hours to remove residual alcohol, thereby obtaining a mixed powder.

[0070] The obtained mixed powder was filled into a 6061 aluminum alloy hollow tube with a circumference of 12 mm and a thickness of 1 mm at a powder filling degree of 30%, and then subjected to rolling with 8 rolling passes and a final deformation of 90%. After the rolling, annealing treatment was performed at 350°C for 2 hours. Subsequently, drawing treatment was performed, and multiple intermediate annealing (at 450°C for 2 hours) was performed to improve formability, and the final diameter of the welding wire was 1.0 mm.

[0071] The obtained welding wire was a 6061 aluminum alloy / diamond cored wire, and the SEM morphology was observed using a scanning electron microscope, as shown in FIG. 1. Figure 2

[0072] The obtained welding wire was used to laser melt and weld an aluminum alloy plate with a special shape. Before welding, the surface of the aluminum alloy plate was cleaned using acetone to remove oil stains and oxides. The laser power used was 3 kw, the welding speed was 100 mm / s, the welding focal point position was offset from the surface by 0.5 mm to ensure the depth and stability of the molten pool, the feeding speed of the welding wire was 60 mm / s, and the incident angle of the welding wire was 20°. High-purity argon gas was used as a protective gas during the laser welding process, and the gas flow rate was 20 L / min.

[0073] Comparative Example 1

[0074] The raw materials were weighed according to the following formulation: the mass fraction of diamond particles was 3 wt%, the mass fraction of Cr powder was 0.1 wt%, the mass fraction of flaky graphite was 0.1 wt%, and the balance was 6061 aluminum alloy powder.

[0075] The particle size of the diamond was 8 microns, the particle size of the Cr powder was 5 microns, the particle size of the flaky graphite was 5 microns, and the particle size of the 6061 aluminum alloy was 10 microns.

[0076] The above raw materials were uniformly mixed, ball milled for 5 hours using a planetary ball mill at a rotation speed of 50 rpm, a ball-to-material ratio of 10:1, and using argon gas as a protective gas throughout the ball milling process, and using alcohol as a ball milling medium. After the ball milling, the mixed powder was placed in a vacuum drying oven and dried at 90°C for 2 hours to remove residual alcohol, thereby obtaining a mixed powder.

[0077] The obtained mixed powder was filled into a pure aluminum hollow tube with a circumference of 8 mm and a thickness of 1 mm, and then subjected to rolling and drawing. Multiple intermediate annealing (at 450°C for 2 hours) was performed to improve formability, and the final diameter of the welding wire was 1 mm.​

[0078] The obtained welding wire is used to weld aluminum alloy plates by electric welding, 99.99% pure argon is used as the protective gas, the gas flow is 18 L / min, the MIG welding current is 220 A, and the welding voltage is 25 V.

[0079] Comparative Example 2

[0080] The 1070 pure aluminum strip with a sheath of 10*1 mm is used, the filling rate is 24%, and the diameter of the filling wire after drawing and reducing is 1.2 mm. The chemical composition of the core includes 26% of metal Zn powder, 12% of metal Mg powder, 7.5% of metal Cu powder, 0.9% of metal Mn powder, 1.0% of metal Cr powder, 8% of composite micron / nano Mo-TiC particles, and the balance is pure aluminum powder.

[0081] The obtained welding wire is used to weld special-shaped aluminum alloy plates by laser melting, and the surface of the aluminum alloy plate is cleaned by using acetone before welding to remove oil stains and oxides. The laser power used is 5 kw, the welding speed is 110 mm / s, the welding focal point position is offset from the surface by 0.5 mm, the depth and stability of the molten pool are ensured, the feeding speed of the welding wire is 80 mm / s, and the incident angle of the welding wire is 45°. High-purity argon is used as the protective gas during the laser welding process, and the gas flow is 20 L / min.

[0082] The welds obtained in the above Examples 1-5 and Comparative Examples 1-2 are detected, and the results are shown in the following table.

[0083] Table 1 Weld detection results of examples and comparative examples

[0084] Method of implementation Weld hardness Weld strength Weld wear rate Weld thermal conductivity Example 1 121.5 HV 334.9 MPa 5.7 x 10 -6 mm 3 / N·m]]> 167.3 W / m-K Example 2 125.4 HV 347.8 MPa 5.4 x 10 -6 mm 3 / N·m]]> 154.2 W / m-K Example 3 127.2 HV 340.5 MPa 5.8 x 10 -6 mm 3 / N·m]]> 155.2 W / m-K Example 4 122.2 HV 337.26 MPa 5.8 x 10 -6 mm 3 / N·m]]> 151.3 W / m-K Example 5 122.5 HV 338.25 MPa 5.5 x 10 -6 mm 3 / N·m]]> 161.9 W / m-K Example 6 130.5 HV 373.2 MPa 4.2 x 10 -6 mm 3 / N·m]]> 166.2 W / m-K Comparative Example 1 91.8 HV 302.94 MPa 9.2 x 10 -5 mm 3 / N·m]]> 100.2 W / m-K Comparative Example 2 84.7 HV 279.51 MPa 8.1 x 10 -4 mm 3 / N·m]]> 96.5 W / m-K

[0085] As can be seen from the data in the above table, the weld obtained by the method of the present application is obviously higher than the data of the comparative examples in terms of weld hardness, weld strength, weld wear rate and weld thermal conductivity.

Claims

1. A diamond particle reinforced aluminum alloy cored wire, characterized by, The core raw material comprises 6061 aluminum alloy powder, metal powder, diamond, graphite powder, wherein the mass fraction of diamond is 1-10wt%, the mass fraction of metal powder is 0.1-2wt%, the mass fraction of graphite powder is 0.1-1wt%, and the balance is 6061 aluminum alloy powder; the 6061 aluminum alloy powder is spherical powder with a particle size of 1-20 microns; the metal powder is one or more of Cr, V, Ti, Mo spherical powder with a particle size of 1-20 microns; the diamond is single crystal or polycrystalline micro powder with a particle size of 0.5-10 microns; and the graphite powder is spherical graphite or flaky graphite with a powder particle size of 0.5-5 microns.

2. A method of producing the diamond particle reinforced aluminum alloy cored wire of claim 1, characterized by, The method comprises the following steps: S1. The raw materials are weighed according to the above formula, ball-mixed, and then filled into a hollow tube made of 6061 aluminum alloy or pure aluminum as a core wire sheath to obtain a core wire; S2. The core wire obtained in step S1 is subjected to rolling, annealing treatment and drawing to obtain the diamond particle reinforced aluminum alloy core wire material.

3. The method of producing a diamond particle reinforced aluminum alloy cored wire according to claim 2, characterized by, The ball-milling is planetary ball-milling, the ball-milling speed is 50-100 rpm, the ball-milling time is 5-20 h, the ball-to-material ratio is (10-20):1, argon is used as a protective atmosphere during ball-milling, alcohol is used as a ball-milling medium, and the mixed powder is vacuum-dried after ball-milling, dried at 70-120 DEG C for 1-3 hours, and residual alcohol is removed.

4. The method of producing a diamond particle reinforced aluminum alloy cored wire according to claim 2, characterized by, In step S1, the powder is filled into a pure aluminum tube or a 6061 aluminum alloy tube with a circumference of 5-20 mm and a thickness of 0.2-1.2 mm, and the powder filling degree is 20%-40%; In step S2, the core wire obtained in step S1 is subjected to several times of rolling, the rolling pass is 5-10 times, the single pass deformation is 15%-20%, the final rolling deformation is 80%-90%, and then annealing treatment is carried out at a temperature of 300-450 DEG C for 0.5-2 h in an argon protective environment, and finally several times of drawing is carried out, annealing is carried out multiple times during the drawing process, the annealing temperature is 400-500 DEG C, the annealing time is 1-3 h, and the diamond particle reinforced aluminum alloy core wire material is obtained; The diameter of the diamond particle reinforced aluminum alloy core wire material is 0.5-2 mm.

5. A laser welding method of the diamond particle reinforced aluminum alloy cored wire according to claim 1 or the diamond particle reinforced aluminum alloy cored wire produced by the production method according to any one of claims 2 to 4, characterized by, The method comprises the following steps: S11. Obtain a special-shaped aluminum alloy plate and clean it; S12. Use laser melting welding to weld the special-shaped aluminum alloy plate using the diamond particle reinforced aluminum alloy core wire material as a welding wire.

6. The laser welding method of diamond particle reinforced aluminum alloy cored wire according to claim 5, characterized by, In step S11, the surface of the aluminum alloy plate is cleaned using acetone to remove oil stains and oxides; In step S12, the laser welding machine used is a fiber laser, the laser power used is 1-10 kw, the welding speed is 10-120 mm / s, the welding focal point position deviates from the surface by 0-1 mm, the feeding speed of the welding wire is 5-100 mm / s, and the welding wire incidence angle is 10-45 DEG; High-purity argon or high-purity helium with a purity range of 99.5-99.9 is used during laser welding, and the gas flow is 15-20 L / min.

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