CN110560957B - Micro-nano particle reinforced aluminum alloy flux-cored filling wire for welding 7075 aluminum alloy - Google Patents
Micro-nano particle reinforced aluminum alloy flux-cored filling wire for welding 7075 aluminum alloy Download PDFInfo
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- CN110560957B CN110560957B CN201910828999.1A CN201910828999A CN110560957B CN 110560957 B CN110560957 B CN 110560957B CN 201910828999 A CN201910828999 A CN 201910828999A CN 110560957 B CN110560957 B CN 110560957B
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
Abstract
A micro-nano particle reinforced aluminum alloy flux-cored filling wire for welding 7075 aluminum alloy belongs to the technical field of material processing engineering. Pure aluminum strips or 5052 aluminum alloy strips are adopted as coating layers, and alloy powder in the flux core is as follows: pure magnesium powder, manganese powder, chromium powder, titanium-aluminum alloy powder and the like, and micro-nano TiC, ZrC, TiN, SiC and other ceramic particles are added into the flux core. When in use, the aluminum alloy flux-cored filling wire is placed in a groove or a welding line and is welded by adopting a conventional metal-inert gas (MIG) method of consumable electrode gas shielded welding. Compared with the existing welding method using the aluminum alloy solid welding wire alone, the method can improve the welding seam strength of the 7075 aluminum alloy, further improve the strength matching degree of a welding joint, reduce hot cracks and air hole sensitivity, and has simple operation process and excellent welding process performance.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy flux-cored wires, relates to an aluminum alloy flux-cored filling wire and a preparation method thereof, and particularly relates to a micro-nano particle reinforced aluminum alloy flux-cored filling wire for welding 7075 aluminum alloy and a preparation method thereof.
Technical Field
Aluminum is a metal element with the largest content in the earth crust, and has the excellent properties of low density, high specific strength, low cost and the like, so that the aluminum is widely applied to the fields of aerospace, war industry, rail vehicles, pressure containers and the like at present. The density of aluminum is one third of that of steel, the weight of the aluminum can be reduced by more than 60% by adopting aluminum to replace a steel structural part, and along with the increasing demand of light weight of the manufacturing industry, the aluminum alloy and the usage amount of the aluminum alloy in structural parts are increased year by year. The 7075 aluminum alloy is a superhard aluminum alloy which is developed for the development of aerospace technology in the 40 th of the 20 th century, the common Al-Zn-Mg-Cu alloy systems at present are developed by adding other trace elements or changing alloy components on the basis of 7075 high-strength aluminum alloy and simultaneously adopting different heat treatment technologies to successively develop high-strength aluminum alloys with excellent performance such as 7475-T74, 7075-T74, 7159-T77 and the like, but the problem of difficult welding is faced.
When the 7075 aluminum alloy is welded by adopting a metal-inert gas welding (MIG) method, thermal cracks are easily generated, the weld joint strength is low, and the general strength of the weld joint can only reach about 60 percent of that of a base metal. Although friction stir welding makes welding of 7075 aluminum alloys possible, welded joints with strength matching up to 80% are obtained. However, friction stir welding has the disadvantages of high requirements for the shape, clamping conditions, welding position and the like of a welded part, and is not suitable for complex weld joint connection. If a small amount of special micro-nano particles can be added into a fusion welding seam, the 7075 aluminum alloy can be prevented from generating hot cracks, and the strength of the welding seam can be improved in a welding state. The aluminum alloy solid welding wire prepared by adopting the smelting method is difficult to change alloy components or add a reinforcing phase, so the research application of the solid welding wire in relevant aspects is limited, and the method adopting the aluminum alloy flux-cored filler wire is easy to adjust the alloy component formula, so a new idea is provided for improving the performance of 7075 aluminum alloy fusion welding, and the idea of the invention is also the idea of the invention.
Disclosure of Invention
The invention organically combines a flux-cored wire technology and a micro-nano particle reinforcing mechanism, designs and prepares the micro-nano particle reinforced aluminum alloy flux-cored filler wire for 7075 aluminum alloy welding, and aims to solve the problem that the MIG welding solid wire cannot change alloy components or add particle reinforcing phases in the prior arc welding technology. When the existing aluminum alloy solid welding wire is used for directly fusion welding 7075 aluminum alloy, hot cracks are easily generated, alloy elements are easily burnt, the welding seam strength is reduced due to thick structures, and the joint strength matching degree is low. The aluminum alloy flux-cored wire filler wire with the micro-nano reinforced particles, which is designed and prepared by the invention, can be placed in a welding seam or a groove before welding, and then MIG welding is carried out according to the conventional steps, so that the welding seam is alloyed by the filler wire, the solid welding wire and a base metal, and the range and possibility of adjusting the aluminum alloy welding seam alloy are enlarged. The welding wire and the use method can obviously reduce the hot cracking tendency of the weld metal under the condition of ensuring that the chemical components, the mechanical property and the corrosion resistance of the weld metal meet the requirements of relevant countries, and obtain the welding joint with attractive appearance, higher strength and excellent performance.
The invention is realized by the following technical scheme: the micro-nano particle reinforced aluminum alloy flux-cored filling wire for 7075 high-strength aluminum alloy welding is characterized in that a pure aluminum or 5052 aluminum alloy belt is used as a sheath, and the powder is prepared from the following components in percentage by mass, wherein the total percentage by mass is 100%, and the powder comprises the following alloy components in percentage by mass: 14-28% of metal magnesium powder, 0.2-0.8% of metal manganese powder, 0.2-0.8% of metal chromium powder, 0.2-1.5% of titanium-aluminum alloy powder and 70-85% of composite micro-nano ceramic powder. The filling rate of the welding wire is 10-35%. The mass ratio of titanium to aluminum in the titanium-aluminum alloy is 1: 1.
The composite micro-nano ceramic powder comprises at least one of TiC, ZrC, TiN, ZrN and the like, and can be mixed in any mass ratio.
Further, the filling rate of the flux-cored filling wire is 15-25%.
Wherein the magnesium powder, the chromium powder and the manganese powder are added in the form of high-purity metal powder with the purity of more than 99.9 percent; the titanium-aluminum alloy powder is added in the form of a high-purity compound with the purity of more than 99.9 percent; preferably, the mass ratio of the chromium metal powder to the manganese metal powder is controlled to be 0.8-1.2, and the mass ratio of the chromium to the titanium-aluminum alloy powder is controlled to be 0.3-0.8.
According to the 7075 aluminum alloy micro-nano particle reinforced flux-cored filling wire, 5052 aluminum-magnesium alloy strips with the magnesium content higher than 2.5% are preferably selected as the 5052 aluminum-magnesium alloy strips, and the flux-cored filling wire is prepared by adopting a conventional flux-cored wire preparation technology.
The preparation method for the 7075 aluminum alloy micro-nano particle reinforced flux-cored filling wire is characterized by comprising the following steps of:
selecting pure aluminum or 5052 aluminum-magnesium alloy strips with the width of 8-12 mm and the thickness of 0.2-0.5 mm as outer skins of the filler wires, rolling the filler wires into U-shaped grooves, filling the powder, wherein the weight of the powder is 10-35% of the weight of the welding wires, closing the U-shaped grooves, sequentially passing through wire drawing dies with different diameters, drawing and reducing the diameter one by one, and cleaning the surfaces of the welding wires to obtain finished welding wires with the diameter of 0.8-2.0 mm.
The aluminum alloy flux-cored filling wire is used for welding 7075 aluminum alloy, and adopts common metal-arc welding (MIG) welding with the current of 100-260A. During welding, the aluminum alloy flux-cored filling wire is placed in a gap between two connected 7075 plates, and then conventional single-pass or multi-pass MIG is adopted for welding.
More preferably, the MIG welding current I satisfies the following relational expression
Wherein d is the diameter of the filler wire of the invention in mm, d0Is the diameter of a conventional MIG electrode wire and v is the welding speed in m/min.
The components of the flux core filling wire are as follows:
mg: the alloy is mainly strengthened, and magnesium element is transited into weld metal.
Mn: the crystal grains are refined, the strength of the welding seam is improved, and the hot cracking tendency is reduced.
Cr: similar to the effect of Mn, the simultaneous addition of Mn acts synergistically.
Titanium-aluminum alloy powder: promote heterogeneous nucleation and refine weld grains.
Micro-nano ceramic reinforced particles: the grains in the weld fusion zone are refined, the appearance of the grains is modified, the hot crack sensitivity is reduced, and the weld strength is improved.
The specific action and mechanism of the micro-nano ceramic reinforced particles are as follows:
the addition of micro-nano particles such as TiC, ZrC, TiN, ZrN and the like can not dilute alloy strengthening elements and can not reduce the strength of the material. The growth of dendritic crystals in a fusion zone is slowed, grains are refined, and the hot crack sensitivity is reduced due to the reduction of the dendritic crystals; the micro-nano particles are beneficial to heterogeneous nucleation and grain refinement; and modifying the second phase strengthening phase to make the second phase fine and dispersed, wherein the crystallographic orientation of the second phase is more random.
By adding micro-nano ceramic particles, the hot crack sensitivity is reduced; the grain shape of the weld joint fusion zone is improved, and the combination of the dendrite and columnar crystal grains becomes approximately spherical. Through a large number of experiments, the content of the added micro-nano ceramic particles is 70-85%, and the particle size is 40 nm-120 mu m.
The high-strength aluminum alloy filling wire provided by the invention adopts 99.99% high-purity Ar as the protective gas, the welding forming is good, the defects of bulges, undercuts and the like are avoided, and various properties of the weld metal meet the engineering requirements. The nanoparticle reinforced drug core filling wire is easy to machine and form, low in cost, simple in operation process, convenient, efficient, good in adaptability, easy to popularize and good in market application value.
Drawings
FIG. 1 shows a schematic view of welding 7075 ultra-strong aluminum alloys using the present invention.
In the figure: 1-common electrode welding wire such as ER 5356 welding wire, 2-pure aluminum or 5052 aluminum-magnesium alloy sheath, and 3-flux-cored filling powder.
Detailed Description
The invention is further illustrated by the following specific embodiments, without restricting its scope to the examples described below. The micro-nano ceramic reinforced particles in the following examples comprise TiC, ZrC, TiN and ZrN, metal Mg powder, metal manganese powder, metal chromium powder and titanium-aluminum alloy powder, the filling rate of the welding wire is 10-35%, and the metal magnesium powder: 80-120 meshes, metal manganese powder: 80-120 meshes, metal chromium powder: 100-200 meshes, titanium-aluminum alloy powder: 80-200 meshes; compounding micro-nano ceramic powder: 40 nm-120 mu m. After being mechanically and uniformly mixed, the mixture is heated to 300 to 400 ℃ in an electric furnace and uniformly stirred.
Table 1 shows that the filler core wire with an appropriate diameter is selected according to the thickness of the base material and the MIG welding current.
TABLE 1 Filler core wire diameter recommended for MIG welding
| Current I (A) | 120-140 | 140-160 | 160-260 |
| Plate thickness (mm) | 2.5～3.4 | 3.4～4.5 | ≥4.5 |
| Diameter (mm) | 1.0-1.2 | 1.2-1.6 | 1.6-2.0 |
The end point values of the sheet thickness (mm) in the table may be arbitrarily included, and for example, the technique of the first column may be selected when the thickness is 2.1mm, or the technique of the second column may be selected.
The following examples and comparative examples simultaneously used 5356 solid wire, having a diameter of 1.2mm, for MIG welding.
Example 1
The micro-nano particle reinforced flux-cored filling wire for welding 7075 ultrahigh-strength aluminum alloy adopts 1070 pure aluminum belt outer skin with the diameter of 0.8mm (the components are shown in table 1); the chemical composition (weight percent) of the flux core is metal Mg powder: 15%, metal manganese powder: 0.3%, metal chromium powder: 0.5%, titanium-aluminum alloy powder: 1.0 percent, the filling rate of the welding wire is 30 percent, and the composite micro-nano ceramic powder is TiC: 83.2 percent. 99.99% pure argon is used as shielding gas, the gas flow is 15L/min, the welding current is 120A, and the welding voltage is 20V.
Example 2
The micro-nano particle reinforced flux-cored filling wire for welding 7075 ultrahigh-strength aluminum alloy adopts 1070 pure aluminum belt outer skin with the diameter of 1.0mm (the components are shown in table 1); the chemical composition (weight percent) of the flux core is metal Mg powder: 20%, metal manganese powder: 0.5%, metal chromium powder: 0.4%, titanium-aluminum alloy powder: 0.8%, the filling rate of the welding wire is 24.5%, and the composite micro-nano ceramic powder is TiC: 48.3%, ZrC: 30 percent. 99.99% pure argon is used as shielding gas, the gas flow is 16L/min, the welding current is 140A, and the welding voltage is 21V.
Example 3
The micro-nano particle reinforced flux-cored filling wire for welding 7075 ultrahigh-strength aluminum alloy adopts 5052 aluminum alloy with a sheath of 9 x 0.3mm (the components are shown in table 1), and the diameter of the flux-cored filling wire is 1.0 mm; the chemical composition (weight percent) of the flux core is metal Mg powder: 16%, metal manganese powder: 0.6%, metal chromium powder: 0.6%, titanium-aluminum alloy powder: 1.0%, the filling rate of the welding wire is 28%, and the composite micro-nano ceramic powder is TiC: 41.8%, TiN: 40 percent. 99.99% pure argon is used as protective gas, the gas flow is 16L/min, the MIG welding current is 180A, and the welding voltage is 23V.
Example 4
The micro-nano particle reinforced flux-cored filling wire for welding 7075 ultrahigh-strength aluminum alloy adopts 5052 pure aluminum belt outer skin with a diameter of 9 multiplied by 0.4mm (the components are shown in table 1), and the diameter of the flux-cored filling wire is 1.2 mm; the chemical composition (weight percent) of the flux core is metal Mg powder: 18.5%, metal manganese powder: 0.6%, metal chromium powder: 0.8%, titanium-aluminum alloy powder: 0.7 percent, the filling rate of the welding wire is 36 percent, and the composite micro-nano ceramic powder is ZrN: 50%, TiN: 29.4 percent. 99.99% pure argon is used as protective gas, the gas flow is 18L/min, the MIG welding current is 220A, and the welding voltage is 25V.
Example 5
The micro-nano particle reinforced flux-cored filling wire for welding 7075 ultrahigh-strength aluminum alloy adopts 1070 pure aluminum belt sheath 10 multiplied by 0.4mm (the components are shown in table 1), and the diameter of the flux-cored filling wire is 1.6 mm; the chemical composition (weight percent) of the flux core is metal Mg powder: 19%, metal manganese powder: 0.4%, metal chromium powder: 0.6%, titanium-aluminum alloy powder: 0.5 percent, the filling rate of the welding wire is 40 percent, and the composite micro-nano ceramic powder is ZrC: 65%, ZrN: 14.5 percent. 99.99% pure argon is used as shielding gas, the gas flow is 18L/min, the MIG welding current is 260A, and the welding voltage is 27V.
Example 6
The micro-nano particle reinforced flux-cored filling wire for welding 7075 ultrahigh-strength aluminum alloy adopts 5052 pure aluminum belt skin with the thickness of 10 multiplied by 0.5mm (the components are shown in table 1), and the diameter of the flux-cored filling wire is 1.6 mm; the chemical composition (weight percent) of the flux core is metal Mg powder: 20%, metal manganese powder: 0.3%, metal chromium powder: 0.3%, titanium-aluminum alloy powder: 1.0%, the filling rate of the welding wire is 28%, and the composite micro-nano ceramic powder is ZrN: 78.4 percent. 99.99% pure argon is used as protective gas, the gas flow is 20L/min, the MIG welding current is 280A, and the welding voltage is 28V.
Comparative example 1
The welding is carried out by adopting a conventional metal-inert gas (MIG) method of consumable electrode gas shielded welding, the filler wire is ER 5356 solid-core welding wire, 99.99% pure argon is used as shielding gas, the gas flow is 16L/min, the MIG welding current is 160A, and the welding voltage is 22V.
Comparative example 2
The micro-nano particle reinforced flux-cored filling wire for welding 7075 ultrahigh-strength aluminum alloy adopts 1070 pure aluminum belt sheath 10 multiplied by 0.5mm (the components are shown in table 1), and the diameter of the flux-cored filling wire is 1.6 mm; the chemical composition (weight percent) of the flux core is metal Mg powder: 18%, metal manganese powder: 0.4%, metal chromium powder: 0.3%, titanium-aluminum alloy powder: 1.0%, the filling rate of the welding wire is 30%, and the balance is pure Al powder: 80.3 percent. 99.99% pure argon is used as protective gas, the gas flow is 18L/min, the MIG welding current is 240A, and the welding voltage is 26V.
Comparative example 3
The micro-nano particle reinforced flux-cored filling wire for welding 7075 ultrahigh-strength aluminum alloy adopts 5052 pure aluminum strip with 12 x 0.5mm (the components are shown in table 1), and the diameter of the flux-cored filling wire is 2.0 mm; the chemical composition (weight percent) of the flux core is metal Mg powder: 6%, metal manganese powder: 0.2%, metal chromium powder: 0.2%, titanium-aluminum alloy powder: 0.6 percent, the filling rate of the welding wire is 35 percent, and the composite micro-nano ceramic powder is ZrC: 47%, TiN: 46 percent. 99.99% pure argon is used as protective gas, the gas flow is 20L/min, the MIG welding current is 260A, and the welding voltage is 25V.
TABLE 2 chemical composition (% by weight) of 1070 pure aluminum strip and 5052 aluminum alloy strip used in examples 1-6 and comparative examples 1-3
| Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | |
| 1070 | 0.022 | 0.167 | 0.005 | 0.008 | 0.015 | / | 0.025 | 0.019 |
| 5052 | 0.063 | 0.196 | 0.004 | 0.045 | 2.334 | 0.18 | 0.040 | / |
Examples the flux cored filled wires prepared in examples 1-6 were subjected to a welding test: adopting a direct current reverse connection method, welding current: 160-180A, welding voltage: 22-24V, wherein the welding test plate is a 7075 aluminum alloy test plate with the thickness of 2-10 mm, the welding speed is 30-50cm/min, the gas flow is 15-20L/min, and the dry elongation is 14 mm. And (5) welding at the flat welding position and the fillet welding position, and observing the welding process. And evaluating the mechanical property, air hole sensitivity, crack resistance and other properties of the welding process after welding. The results show that: the welding wire in the patent formula range has good manufacturability in the welding process, attractive weld forming, and excellent mechanical property and crack resistance; however, the welding wire which is out of the range of the patent formula or is not used in the welding method of the patent has poor welding overall manufacturability, mechanical property and crack resistance. The results of the weld property tests of the examples are shown in Table 3.
Table 3 the core mix and final weld properties of the examples are compared as follows:
firstly, adopting 300-150-10 mm aluminum plates to prepare butt welding joints, adopting X-rays to shoot a welding seam negative film, and counting the area percentage of air holes. Stomata sensitivity was evaluated by score, 10 points full, with the following scoring criteria:
| area of air hole | ≥5％ | 3.5％～5％ | 2％～3.5％ | 1％～2％ | ≤1 |
| Scoring | |||||
| 1～6 | 7 | 8 | 9 | 10 |
② a butt welding joint is prepared by adopting 300X 150X 10mm aluminum plate, the total length of the welding seam crack is detected by ultrasonic diffraction, V represents good, O represents normal, and X represents unqualified. The specific rule is as follows: no macroscopic and microscopic cracks were found to be good; the appearance of a certain amount of microcracks is general; the occurrence of a large number of micro-cracks or the occurrence of macro-cracks was counted as failure.
The weld metal of the invention preferably comprises the following chemical components in percentage by mass: magnesium: 4.2% -5.3%, manganese: 0.1-0.2%, chromium: 0.1% -0.2%, titanium: 0.05 percent to 0.18 percent; micro-nano particles: 0.1 to 5 percent of aluminum and the balance of aluminum.
Compared with the common MIG welding method, the flux-cored filling wire added with the micro-nano ceramic particles in the embodiment of the invention maximally improves the tensile strength of a welding joint by 23.6%, and meanwhile, the crack resistance is obviously improved and the air hole sensitivity is reduced to a certain extent. The dosage of the specific composition of the micro-nano ceramic particles has certain influence on the welding performance, and the total dosage of the micro-nano ceramic particles has great influence on the welding performance.
Claims (8)
1. The micro-nano particle reinforced aluminum alloy flux-cored filling wire for 7075 high-strength aluminum alloy MIG welding is characterized in that pure aluminum or 5052 aluminum-magnesium alloy strip is used as a sheath, and the powder is prepared from the following components in percentage by mass, wherein the total percentage by mass is 100%, and the components in the powder are as follows: 14-28% of magnesium metal powder, 0.2-0.8% of manganese metal powder, 0.2-0.8% of chromium metal powder, 0.2-1.5% of titanium-aluminum alloy powder and 70-85% of composite micro-nano ceramic powder; the filling rate of the welding wire is 10-35%, and the mass ratio of titanium to aluminum in the titanium-aluminum alloy is 1: 1.
2. The micro-nano particle reinforced aluminum alloy flux-cored filler wire for 7075 high-strength aluminum alloy MIG welding as claimed in claim 1, wherein the composite micro-nano ceramic powder comprises at least one of TiC, ZrC, TiN and ZrN, and can be mixed in any mass ratio, wherein the purity of the micro-nano particles is greater than or equal to 99.7%, the micro-nano particles are approximately spherical in shape, and the micro-nano particles have good fluidity.
3. The micro-nano particle reinforced aluminum alloy flux cored filler wire for 7075 high strength aluminum alloy MIG welding as claimed in claim 1 wherein the magnesium, chromium and manganese powders are added as high purity metal powders with purity greater than 99.9%; the titanium-aluminum alloy powder is added in the form of a high-purity compound with the purity of more than 99.9 percent.
4. The micro-nano particle reinforced aluminum alloy flux-cored filler wire for MIG welding of 7075 high-strength aluminum alloy according to claim 1, wherein the mass ratio of the metal chromium powder to the metal manganese powder is controlled to be 0.8-1.2, and the mass ratio of the chromium to the titanium-aluminum alloy powder is controlled to be 0.3-0.8.
5. The micro-nano particle reinforced aluminum alloy flux-cored filler wire for 7075 high-strength aluminum alloy MIG welding according to claim 1, wherein the 5052 aluminum-magnesium alloy strip is a 5052 aluminum-magnesium alloy strip with a magnesium content higher than 2.5%.
6. The preparation method of the micro-nano particle reinforced aluminum alloy flux-cored filling wire for 7075 high-strength aluminum alloy MIG welding as claimed in any one of claims 1 to 5, wherein the method comprises the following steps:
selecting pure aluminum or 5052 aluminum-magnesium alloy strips with the width of 8-12 mm and the thickness of 0.2-0.5 mm as outer skins of the filler wires, rolling the filler wires into U-shaped grooves, filling the powder, wherein the weight of the powder is 10-35% of the weight of the welding wires, closing the U-shaped grooves, sequentially passing through wire drawing dies with different diameters, drawing and reducing the diameter one by one, and cleaning the surfaces of the welding wires to obtain finished welding wires with the diameter of 0.8-2.0 mm.
7. The use of a micro-nano particle reinforced aluminum alloy flux cored filler wire for MIG welding of 7075 high strength aluminum alloy as claimed in any one of claims 1 to 5 for welding of 7075 aluminum alloy.
8. The use of claim 7 for MIG welding wherein said aluminum alloy flux cored filler wire is placed in the weld seam of two joined 7075 plates and then welded in a single or multiple pass using conventional MIG welding.
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