CN111112872A - Welding wire for high-strength 7xxx aluminum alloy and preparation method thereof - Google Patents
Welding wire for high-strength 7xxx aluminum alloy and preparation method thereof Download PDFInfo
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- CN111112872A CN111112872A CN201911411481.4A CN201911411481A CN111112872A CN 111112872 A CN111112872 A CN 111112872A CN 201911411481 A CN201911411481 A CN 201911411481A CN 111112872 A CN111112872 A CN 111112872A
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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
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
- B23K35/286—Al as the principal constituent
- B23K35/288—Al as the principal constituent with Sn or Zn
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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
- B23K35/40—Making wire or rods for soldering or welding
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
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Abstract
The invention discloses a welding wire for high-strength 7xxx aluminum alloy and a preparation method thereof. The welding wire contains TiB2A particulate 7 xxx-series aluminum alloy comprising, in weight percent: 6.7-12 wt.% Zn, 2.0-2.75 wt.% Mg, 2.0-2.5 wt.% Cu, 0.05-0.1 wt.% Si, Fe < 0.05 wt.%, 0.14-6.89 wt.% Ti, 0.06-3.11 wt.% B, the balance being Al.
Description
Technical Field
The invention relates to the technical field of aluminum alloy welding wires, in particular to a welding wire for high-strength 7xxx aluminum alloy and a preparation method thereof.
Background
The 7xxx series aluminum alloy has wide application in the fields of aerospace, military and national defense, rail transit and ships due to higher specific strength. The development of modern industry has put more demands on material selection and structural design to be lightweight, which requires the conversion of riveted structures to welded structures. The poor welding quality and poor welding performance between 7xxx series aluminum alloys are always difficult to disturb welding personnel. Generally, the welding of aluminum alloy generally has the following difficulties: 1) the aluminum alloy has high thermal conductivity, and higher linear energy is needed during welding; 2) the aluminum has high affinity with oxygen, and an oxide film with a higher melting point is easily formed; 3) the linear expansion coefficient of the aluminum alloy is large, and welding deformation is easy to occur; 4) zn and Mg elements in the 7xxx series aluminum alloy have lower melting points and are easy to volatilize; 5) in a welding heat cycle of the 7xxx series aluminum alloy, a heat affected zone is easy to generate overaging and grain coarsening, and the performance is reduced. Under the combined action of a plurality of influencing factors, the welding between the 7xxx series aluminum alloys is quite difficult.
The continuous development of welding technology shows various novel welding technologies (TIG welding, MIG welding, stirring friction welding and the like) and processes, and the welding problem of the 7xxx series aluminum alloy is improved to a certain extent, but the welding wire has many limitations in the aspect of material selection. The selection of the welding wire plays an important role in the welding of two structural parts, and the welding quality and the welding performance are directly related. Under certain specific working environments, welded structural parts cannot be subjected to deformation processing and heat treatment, and the structure and the performance of a welding seam can be controlled only through proper welding wire selection and a welding process. Therefore, in view of the welding difficulty of the 7xxx series aluminum alloys and the importance of the welding wire, the development of a welding wire for high-strength 7xxx series aluminum alloys is urgently needed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide the TiB synthesized in situ2The particles are dispersed in the aluminum alloy, the welding wire has fine crystal grains, uniform structure and high resistivity, the problems existing in the welding process of the 7xxx series aluminum alloy can be effectively solved, the welding quality and the welding strength are greatly improved, and the welding wire for the high-strength 7xxx aluminum alloy and the preparation method thereof meet the comprehensive requirements on the performance of the welding wire in practical application.
In order to solve the technical problems, the invention adopts the following technical scheme:
a welding wire for high-strength 7xxx aluminum alloy is characterized by comprising TiB2A particulate 7 xxx-series aluminum alloy comprising, in weight percent: 6.7-12 wt.% Zn, 2.0-2.75 wt.% Mg, 2.0-2.5 wt.% Cu, 0.05-0.1 wt.% Si, Fe < 0.05 wt.%, 0.14-6.89 wt.% Ti, 0.06-3.11 wt.% B, the balance being Al.
In a preferred embodiment of the invention, the wire is TiB-containing2A particulate 7 xxx-series aluminum alloy comprising, in weight percent: 6.9% Zn, 2.75% Mg, 2.0% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 2.77 wt.% Ti, 1.23 wt.% B, the balance being Al.
In a preferred embodiment of the invention, the wire is TiB-containing2A particulate 7 xxx-series aluminum alloy comprising, in weight percent: 10% Zn, 2.75% Mg, 2.0 wt.% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 2.77 wt.% Ti, 1.23 wt.% B, the balance being Al.
In a preferred embodiment of the invention, the wire is TiB-containing2A particulate 7 xxx-series aluminum alloy comprising, in weight percent: 10 wt.% Zn, 2.75 wt.% Mg, 2.0 wt.% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 5.54 wt.% Ti, 2.46 wt.% B, the balance being Al.
In a preferred embodiment of the invention, the wire is TiB-containing2A particulate 7 xxx-series aluminum alloy comprising, in weight percent: 7.5 wt.% Zn, 2.5 wt.% Mg, 2.0 wt.% Cu, 0.1 w%t.% Si, Fe < 0.05 wt.%, 2.77 wt.% Ti, 1.23 wt.% B, balance Al.
In a preferred embodiment of the invention, the wire is TiB-containing2A particulate 7 xxx-series aluminum alloy comprising, in weight percent: 10 wt.% Zn, 2.75 wt.% Mg, 2.0 wt.% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 2.77 wt.% Ti, 1.23 wt.% B, the balance being Al.
The invention also discloses a preparation method of the welding wire for the high-strength 7xxx aluminum alloy, which is characterized by comprising the following steps of:
s1: adding pure aluminum into a crucible, heating and melting, adding JZF-03 type covering agent, heating and melting after uniform covering, and then uniformly mixing and drying the KBF4And K2TiF6Adding salt into the melt, mechanically stirring for full reaction, then sequentially adding Cu grains, Al-Si alloy, Mg grains and Zn grains, adding a JZJ type refining agent for degassing and refining, then removing reaction byproducts, standing and cooling to obtain an ingot;
s2: removing the surface of the ingot casting vehicle obtained in the step S1, and carrying out hot extrusion to obtain a wire blank;
s3: and drawing the wire blank for multiple passes, wherein each pass of drawing is alternately performed with stress relief annealing, finally, drawing the wire blank into a welding wire with required specification, and cleaning to obtain the welding wire for the high-strength 7xxx aluminum alloy.
In a preferred embodiment of the present invention, the covering agent in the step S1 is JZF-03 type high temperature covering agent, and the temperature is raised to 650-850 ℃; KBF4And K2TiF6The mass ratio is 1: 0.5-1: 2; mechanically stirring for 10-45 min; the refining temperature is 650 plus 750 ℃, and the refining time is 10-20 min.
In a preferred embodiment of the present invention, the hot extrusion temperature in the step S2 is 350-450 ℃, the extrusion speed is 0.5-2m/min, and the extrusion ratio is 16-25.
In a preferred embodiment of the present invention, in the step S3, the bar obtained in the step S2 is subjected to 8-25 passes of drawing, and after each pass, the bar is annealed at 300-400 ℃ for 20 min.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a composition containing TiB2Welding wire with particles for high-strength 7 xxx-series aluminum alloy and preparation method thereof, TiB2The dispersion is evenly distributed, the risk of particle agglomeration is greatly reduced in the welding process, and TiB2The particles provide a large number of nucleation sites, the growth of crystal grains is limited, and the strength of the welding seam is improved.
2. The invention provides a composition containing TiB2Granular 7xxx series aluminum alloy welding wire due to TiB2The dispersion distribution increases the probability of electron scattering, improves the resistivity and can reduce the linear energy in the welding process.
3. The invention provides a composition containing TiB2The granular 7xxx series aluminum alloy welding wire contains high-content Zn and Mg elements and can supplement the volatilization of the Zn and Mg elements in the welding process.
4. The invention provides a preparation method of a welding wire for high-strength 7xxx series aluminum alloy, and TiB synthesized in situ by mixed salt2The particles are fine, the subsequent hot extrusion is more beneficial to the dispersion distribution of the particles, the preparation process is simple, the processing cost is low, and the large-scale industrial production is facilitated.
5. TiB of the invention2The ceramic particles account for less than or equal to 6 percent of the total weight of the welding wire, the comprehensive performance of the welding wire is effectively improved, and if TiB2The ceramic particles exceed 6 percent of the total weight of the welding wire, which can cause the defects of welding wire materials, air holes, looseness, poor welding seam performance and the like.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below.
Example 1
A welding wire for high-strength 7xxx aluminum alloy contains TiB2A particulate 7xxx series aluminum alloy comprising, in weight percent: 6.9% Zn, 2.75% Mg, 2.0% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 2.77 wt.% Ti, 1.23 wt.% B, the balance being Al.
The method of making the welding wire for high strength 7xxx aluminum alloys of example 1, including the steps of:
s1: adding pure aluminum into a crucible, heating to melt, adding JZF-03 type covering agent, uniformly covering, heating to 750 ℃ to melt, uniformly mixing, drying, and mixing in a mass ratio of 2: KBF of 14And K2TiF6Adding salt into the melt, mechanically stirring and fully reacting for 20min, then sequentially adding Cu grains, Al-Si alloy (10 wt.% of Si), Mg grains and Zn grains, adding JZJ type refining agent, degassing and refining at 750 ℃ for 20min, then removing reaction by-products, standing and cooling to form cast ingots;
s2: removing the skin of the ingot casting vehicle, and carrying out hot extrusion, wherein the hot extrusion temperature is 400 ℃, the extrusion speed is 2mm/min, and the extrusion ratio is 16: 1;
s3: drawing the extruded 10mm bar for 12 times, tempering for 10min at the drawing interval of 350 ℃ in each time, drawing into a welding wire with the thickness of 2mm, and finally carrying out sizing scraping, cleaning and surface treatment to obtain the welding wire for the high-strength 7xxx series aluminum alloy. Tests show that the welding wire is subjected to TiB-containing welding by TIG welding technology2The welding strength of the particle high-strength 7xxx series aluminum alloy can reach 76.5 percent of that of the base metal after welding through a mechanical property test.
Example 2
A welding wire for high-strength 7xxx aluminum alloy contains TiB2A particulate 7xxx series aluminum alloy comprising, in weight percent: 10% Zn, 2.75% Mg, 2.0 wt.% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 2.77 wt.% Ti, 1.23 wt.% B, the balance being Al.
The method of making the welding wire for high strength 7xxx aluminum alloys of embodiment 2, including the steps of:
s1: adding pure aluminum into a crucible, heating to melt, adding JZF-03 type covering agent, uniformly covering, heating to 750 ℃ to melt, uniformly mixing, drying, and mixing in a mass ratio of 2: KBF of 14And K2TiF6Adding salt into the melt, mechanically stirring for reacting for 20min, sequentially adding Cu grains, Al-Si alloy (10 wt.% Si), Mg grains and Zn grains, adding JZJ type refining agent, degassing and refining at 750 deg.C for 20min, and removing reactionStanding and cooling the by-product to form a cast ingot;
s2: removing the skin of the ingot casting vehicle, and carrying out hot extrusion, wherein the hot extrusion temperature is 400 ℃, the extrusion speed is 2mm/min, and the extrusion ratio is 16: 1;
s3: drawing the extruded 10mm bar for 12 times, tempering for 10min at the drawing interval of 350 ℃ in each time, drawing into a welding wire with the thickness of 2mm, and finally carrying out sizing scraping, cleaning and surface treatment to obtain the welding wire for the high-strength 7xxx series aluminum alloy. Tests show that the welding wire is subjected to TiB-containing welding by TIG welding technology2The welding strength of the particle high-strength 7xxx series aluminum alloy can reach 71.8 percent of that of the base metal after welding through a mechanical property test.
Example 3
A welding wire for high-strength 7xxx aluminum alloy contains TiB2A particulate 7xxx series aluminum alloy comprising, in weight percent: 10 wt.% Zn, 2.75 wt.% Mg, 2.0 wt.% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 5.54 wt.% Ti, 2.46 wt.% B, the balance being Al.
The method of making the welding wire for high strength 7xxx aluminum alloys of embodiment 3, including the steps of:
s1: adding pure aluminum into a crucible, heating to melt, adding JZF-03 type covering agent, uniformly covering, heating to 750 ℃ to melt, uniformly mixing, drying, and mixing in a mass ratio of 2: KBF of 14And K2TiF6Adding salt into the melt, mechanically stirring and fully reacting for 20min, then sequentially adding Cu grains, Al-Si alloy (10 wt.% of Si), Mg grains and Zn grains, adding JZJ type refining agent, degassing and refining at 750 ℃ for 20min, then removing reaction by-products, standing and cooling to form cast ingots;
s2: removing the skin of the ingot casting vehicle, and carrying out hot extrusion, wherein the hot extrusion temperature is 400 ℃, the extrusion speed is 2mm/min, and the extrusion ratio is 16: 1;
s3: drawing the extruded 10mm bar for 12 times, tempering for 10min at the drawing interval of 350 ℃ in each time, drawing into a welding wire with the thickness of 2mm, and finally carrying out sizing scraping, cleaning and surface treatment to obtain the welding wire for the high-strength 7xxx series aluminum alloy. Through tests, the welding wire is subjected to TIG welding technology,carrying out a process containing TiB2The welding strength of the particle high-strength 7xxx series aluminum alloy can reach 70.1 percent of that of the base metal after welding through a mechanical property test.
Example 4
A welding wire for high-strength 7xxx aluminum alloy contains TiB2A particulate 7xxx series aluminum alloy comprising, in weight percent: 7.5 wt.% Zn, 2.5 wt.% Mg, 2.0 wt.% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 2.77 wt.% Ti, 1.23 wt.% B, the balance being Al.
The method of making the welding wire for high strength 7xxx aluminum alloys of embodiment 4, including the steps of:
s1: adding pure aluminum into a crucible, heating to melt, adding JZF-03 type covering agent, uniformly covering, heating to 750 ℃ to melt, uniformly mixing, drying, and mixing in a mass ratio of 2: KBF of 14And K2TiF6Adding salt into the melt, mechanically stirring and fully reacting for 20min, then sequentially adding Cu grains, Al-Si alloy (10 wt.% of Si), Mg grains and Zn grains, adding JZJ type refining agent, degassing and refining at 750 ℃ for 20min, then removing reaction by-products, standing and cooling to form cast ingots;
s2: removing the skin of the ingot casting vehicle, and carrying out hot extrusion, wherein the hot extrusion temperature is 400 ℃, the extrusion speed is 2mm/min, and the extrusion ratio is 16: 1;
s3: drawing the extruded 10mm bar for 12 times, tempering for 10min at the drawing interval of 350 ℃ in each time, drawing into a welding wire with the thickness of 2mm, and finally carrying out sizing scraping, cleaning and surface treatment to obtain the welding wire for the high-strength 7xxx series aluminum alloy. Tests show that the welding wire is subjected to TiB-containing welding by TIG welding technology2The welding strength of the particle high-strength 7xxx series aluminum alloy can reach 76.8 percent of that of the base metal after welding through a mechanical property test.
Example 5
A welding wire for high-strength 7xxx aluminum alloy contains TiB2A particulate 7xxx series aluminum alloy comprising, in weight percent: 10 wt.% Zn, 2.75 wt.% Mg, 2.0 wt.% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 2.77 wt.% Ti, 1.23 wt.% B, the balance being Al.
The method of making the welding wire for high strength 7xxx aluminum alloys of embodiment 5, including the steps of:
s1: adding pure aluminum into a crucible, heating to melt, adding JZF-03 type covering agent, uniformly covering, heating to 750 ℃ to melt, uniformly mixing, drying, and mixing in a mass ratio of 2: KBF of 14And K2TiF6Adding salt into the melt, mechanically stirring and fully reacting for 20min, then sequentially adding Cu grains, Al-Si alloy (10 wt.% of Si), Mg grains and Zn grains, adding JZJ type refining agent, degassing and refining at 750 ℃ for 20min, then removing reaction by-products, standing and cooling to form cast ingots;
s2: removing the skin of the ingot casting vehicle, and carrying out hot extrusion, wherein the hot extrusion temperature is 400 ℃, the extrusion speed is 2mm/min, and the extrusion ratio is 16: 1;
s3: drawing the extruded 10mm bar for 12 times, tempering for 10min at the drawing interval of 350 ℃ in each time, drawing into a welding wire with the thickness of 2mm, and finally carrying out sizing scraping, cleaning and surface treatment to obtain the welding wire for the high-strength 7xxx series aluminum alloy. Tests show that the welding wire is subjected to TiB-containing welding by TIG welding technology2The welding strength of the particle high-strength 7xxx series aluminum alloy can reach 74.5 percent of that of the base metal after welding through a mechanical property test.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A welding wire for high-strength 7xxx aluminum alloy, which is characterized by containing TiB2A particulate 7 xxx-series aluminum alloy comprising, in weight percent: 6.7-12 wt.% Zn, 2.0-2.75 wt.% Mg, 2.0-2.5 wt.% Cu, 0.05-0.1 wt.% Si, Fe < 0.05wt.%, 0.14-6.89 wt.% Ti, 0.06-3.11 wt.% B, with the balance being Al.
2. The welding wire for a high strength 7xxx aluminum alloy of claim 1, wherein: the welding wire contains TiB2A particulate 7 xxx-series aluminum alloy comprising, in weight percent: 6.9% Zn, 2.75% Mg, 2.0% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 2.77 wt.% Ti, 1.23 wt.% B, the balance being Al.
3. The welding wire for a high strength 7xxx aluminum alloy of claim 1, wherein: the welding wire contains TiB2A particulate 7 xxx-series aluminum alloy comprising, in weight percent: 10% Zn, 2.75% Mg, 2.0 wt.% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 2.77 wt.% Ti, 1.23 wt.% B, the balance being Al.
4. The welding wire for a high strength 7xxx aluminum alloy of claim 1, wherein: the welding wire contains TiB2A particulate 7 xxx-series aluminum alloy comprising, in weight percent: 10 wt.% Zn, 2.75 wt.% Mg, 2.0 wt.% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 5.54 wt.% Ti, 2.46 wt.% B, the balance being Al.
5. The welding wire for a high strength 7xxx aluminum alloy of claim 1, wherein: the welding wire contains TiB2A particulate 7 xxx-series aluminum alloy comprising, in weight percent: 7.5 wt.% Zn, 2.5 wt.% Mg, 2.0 wt.% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 2.77 wt.% Ti, 1.23 wt.% B, the balance being Al.
6. The welding wire for a high strength 7xxx aluminum alloy of claim 1, wherein: the welding wire contains TiB2A particulate 7 xxx-series aluminum alloy comprising, in weight percent: 10 wt.% Zn, 2.75 wt.% Mg, 2.0 wt.% Cu, 0.1 wt.% Si, Fe < 0.05 wt.%, 2.77 wt.% Ti, 1.23 wt.% B, the balance being Al.
7. A method of making a welding wire for a high strength 7xxx aluminum alloy, for use in making the welding wire of claim 1 for a high strength 7xxx aluminum alloy, the method comprising the steps of:
s1: adding pure aluminum into a crucible, heating and melting, adding JZF-03 type covering agent, heating and melting after uniform covering, and then uniformly mixing and drying the KBF4And K2TiF6Adding salt into the melt, mechanically stirring for full reaction, then sequentially adding Cu grains, Al-Si alloy, Mg grains and Zn grains, adding a JZJ type refining agent for degassing and refining, then removing reaction byproducts, standing and cooling to obtain an ingot;
s2: removing the surface of the ingot casting vehicle obtained in the step S1, and carrying out hot extrusion to obtain a wire blank;
s3: and (3) drawing the wire blank for multiple times, wherein each drawing is performed alternately with stress relief annealing, finally drawing the wire blank into a welding wire with required specification, and cleaning to obtain the welding wire for the high-strength 7xxx aluminum alloy.
8. The method of making a welding wire for a high strength 7xxx aluminum alloy as in claim 7, wherein: the covering agent in the step S1 is JZF-03 type high-temperature covering agent, and the temperature is raised to 650-850 ℃; KBF4And K2TiF6The mass ratio is 1: 0.5-1: 2; mechanically stirring for 10-45 min; the refining temperature is 650 plus 750 ℃, and the refining time is 10-20 min.
9. The method of making a welding wire for a high strength 7xxx aluminum alloy as in claim 7, wherein: the hot extrusion temperature in the step S2 is 350-450 ℃, the extrusion speed is 0.5-2m/min, and the extrusion ratio is 16-25.
10. The method of making a welding wire for a high strength 7xxx aluminum alloy as in claim 7, wherein: in the step S3, the bar obtained in the step S2 is subjected to 8-25 passes of drawing, and annealing is carried out at the temperature of 300-400 ℃ for 20min after each pass.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114892052A (en) * | 2022-05-10 | 2022-08-12 | 上海工程技术大学 | High-surface-tension 7 xxx-series aluminum alloy welding wire and preparation method and application thereof |
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