Aluminum-silicon-strontium-titanium-rare earth alloy and aluminum-silicon-strontium-titanium-rare earth alloy welding wire prepared therefrom

Abstract

The application relates to an aluminum-silicon-strontium-titanium-zirconium alloy and an aluminum-silicon-strontium-titanium-zirconium alloy welding wire prepared from the same and belongs to the technical field of aluminum alloy welding wires. The alloy components and the weight percentages are as follows: Si: 4.50-5.50%; Mg: 0.01-0.05%; Sr: 0.02-0.50%; Ti: 0.01-0.15%; Zr: 0.01-0.20%; La: 0.01-0.10%; Ce: 0.01-0.15%; C: <0.0010%; the balance is Al and inevitable impurity elements, and the content of the inevitable impurity elements is less than 1.0 wt%. The application further discloses an aluminum-silicon-strontium-titanium-zirconium alloy welding wire prepared from the aluminum-silicon-strontium-titanium-zirconium alloy. Through control of the alloy components and the content of each component, the welding wire formed by the application has excellent performance in alloy mechanical properties, casting performance, grain refinement and welding quality.

Description

Technical Field

[0001] This invention belongs to the field of aluminum alloy welding wire technology, and relates to an aluminum-silicon-strontium-titanium-zirconium alloy and an aluminum-silicon-strontium-titanium-zirconium alloy welding wire prepared therefrom. Background Technology

[0002] With the optimization and upgrading of my country's industrial structure, there is an urgent need for lightweighting in industries such as high-speed rail, automobiles, rail transit, pressure vessels, shipbuilding, petrochemicals, aerospace, and military. As a result, the demand for aluminum manufacturing products has grown rapidly, and consequently, the demand for high-performance aluminum and aluminum-based alloy welding wire products (hereinafter referred to as aluminum and aluminum alloy welding wire) has also grown rapidly.

[0003] Currently, aluminum alloy welding mainly uses inert gas shielded arc welding. However, this method does not meet the requirements of the growing trend, thus posing new challenges to the performance of aluminum alloys and aluminum alloy welding wires. Currently, domestically produced welding wires, such as the typical grade ER4043, suffer from problems such as low welding strength and coarse weld microstructure during use. Researchers have attempted to improve weld strength by adding Cu and refine the grain size of the welding wire by adding Mn and Sr, but these methods still cannot meet the demands of high-end products.

[0004] Aluminum and aluminum alloy welding wires produced by commonly used processes such as smelting, continuous casting (continuous casting and rolling), and wire drawing (including multi-pass annealing) may not be able to undergo effective melt treatment, resulting in a large number of inclusions and high hydrogen content inside the wires. This leads to defects such as porosity and inclusions in the weld during welding, affecting the quality of the weld; or they may not be suitable for mass production of welding wires.

[0005] With the expanding application scenarios of high-end aluminum alloy welding materials, especially the increasing maturity of laser-MIG hybrid welding technology, customers are demanding higher stability and consistency in material performance. More and more manufacturers are recognizing the importance of welding wire product quality stability and are optimizing their products in various aspects. Therefore, there is a need to provide a new aluminum alloy welding material and a streamlined preparation method for high-performance welding applications. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing an aluminum-silicon-strontium-titanium-zirconium alloy and using it to prepare an aluminum-silicon-strontium-titanium-zirconium alloy welding wire with excellent plasticity and toughness, high weld strength, and uniform and fine weld structure.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] An aluminum-silicon-strontium-titanium-zirconium alloy for manufacturing welding wire, the composition and weight percentage of the alloy are as follows:

[0009] Si: 4.50–5.50%; Mg: 0.01–0.05%; Sr: 0.02–0.50%; Ti: 0.01–0.15%; Zr: 0.01–0.20%; La: 0.01–0.10%; Ce: 0.01–0.15%; C: <0.0010%; balance Al and unavoidable impurity elements; unavoidable impurity element content less than 1.0 wt%.

[0010] This invention achieves the following effects by adding Zr: Zr has low solid solubility in the Al matrix, and its most significant effects are controlling grain size and morphology, inhibiting recrystallization, and improving alloy strength. Zr exists in aluminum alloys mainly in two ways: 1) it is dissolved in the aluminum matrix, playing a role in solid solution strengthening; 2) during solidification or homogenization, fine coherent or incoherent Al3Zr dispersed particles precipitate from the supersaturated solid solution, pinning grain boundaries and inhibiting recrystallization, while also playing a role in dispersion strengthening. Therefore, the addition of Zr improves the mechanical properties of the welding wire.

[0011] The trace element La added in this invention can promote the formation of β-AlFeSi impurities in the solute, making them smaller and reducing the sensitivity of Fe to cracks during alloy casting. It can also reduce rolling stress during rolling, broaden the hot working temperature range of the alloy, make rolling more stable, improve the mechanical properties of the alloy material, and enhance the weld strength during final welding.

[0012] This invention also adds trace amounts of Ce. Generally, the more alloying elements there are, the less dense the oxide layer becomes during the melting process. This can lead to the continuous burning off of various elements before casting, ultimately resulting in the element content in the material not meeting the design values. The relatively reactive Ce element added in this invention can preferentially react with the molten aluminum to form a denser oxide layer, protecting the oxide layer structure from the influence of other elements, thereby reducing material burn-off. However, because adding too much Ce can easily cause gas absorption in the melt and a loose casting structure, it needs to be added in combination with La to reduce the adverse effects of Ce addition on the material.

[0013] This invention adds a small amount of Mg to co-produce Mg2Si with Si, which plays a role in dispersion strengthening, improving strength, and modifying silicon particles, thus refining the grain size and improving the performance stability of the welding wire material, reducing wire breakage during the stretching process of the finished product. However, adding too much Mg will cause Mg2Si to agglomerate, break the α-Al matrix, and reduce the plasticity of the material. According to the regression analysis of this invention, the amount of Mg added is 0.01 to 0.05 wt%.

[0014] This invention refines grains by adding Sr and C: Sr can spheroidize needle-like eutectic silicon, hindering the growth of Si particles in AlSi alloys, thereby refining grains; C can form TiC particles with Ti, which act as nuclei during the solidification of aluminum melt, promoting nucleation inside the liquid metal and forming fine grains.

[0015] This invention improves strength and refines grain size by adding a certain amount of Ti. On the one hand, Ti reacts with C to form the TiC phase, which refines the grain size; on the other hand, the remaining Ti forms the Al3Ti phase, which improves the strength of the alloy.

[0016] The welding wire of this invention remelts and resolidifies during welding to form a weld structure. The Ti, C, Mg, and Zr elements used preferentially form a second phase during resolidation and are dispersed throughout the weld melt, acting as nuclei to promote internal nucleation of the liquid metal in the weld, thereby refining the weld grain structure. Based on the alloy chemical composition design of this invention, the Ti, C, Mg, and Zr elements added during alloying melting, as verified by research on the final welding wire product and welding applications, show that the metal compounds formed by these four elements can appropriately increase the viscosity of the melt, improve spatter phenomena during aluminum alloy welding, and enhance weld quality.

[0017] The elements added in this invention do not act in isolation, but rather influence each other. By controlling the alloy composition of the welding wire and the content of each component, the resulting alloy exhibits excellent properties in terms of mechanical properties, casting performance, grain refinement, and welding quality.

[0018] Preferably, the weight ratio of Ce to La is (1.5 to 2.5):1.

[0019] Preferably, the impurity elements include: Zn ≤ 0.01 wt%, Sb ≤ 0.015 wt%, Bi ≤ 0.015 wt%, Cr ≤ 0.05 wt%, Fe ≤ 0.50 wt%, Ni ≤ 0.05 wt%, Ba ≤ 0.01 wt%, Sn ≤ 0.05 wt%, Ga ≤ 0.05 wt%, P ≤ 0.02 wt%, V ≤ 0.03 wt%, Li ≤ 0.001 wt%, Na ≤ 0.05 wt%, and Ca ≤ 0.005 wt%.

[0020] Further optimization yields Li+Na+Ca≤0.01wt%.

[0021] A method for preparing an aluminum-silicon-strontium-titanium-zirconium alloy welding wire, the method comprising: sequentially batching the alloy components, smelting, continuously casting and rolling to form a billet, annealing, plastic processing, online integrated processing, packaging, and settling.

[0022] As a preferred option, during the continuous casting and rolling process, Al-Ti-C wire is added after online filtration and before casting. The diameter of the Al-Ti-C wire is Φ7.5~Φ12.5mm, and the addition speed is 5~100cm / min.

[0023] Further preferred, the content of C element in Al-Ti-C wire is 0.05-0.5%, and the content of Ti element is 2-6%; the amount of Al-Ti-C wire added is 0.05-0.50% of the total mass of the alloy ingredients.

[0024] As a preferred option, the casting temperature during the continuous casting and rolling process is 650–710℃.

[0025] Further optimization yields billet bars with dimensions of Φ5.8~Φ7.0mm after continuous casting and rolling.

[0026] As a preferred option, the annealing process adopts a 3-stage treatment: the temperature is raised to 485-520℃ within 0.5-5 hours and held for 1.5-18 hours, and then cooled to 60-100℃ within 2-10 hours before being removed from the furnace.

[0027] Preferably, the dimensions of the product after plastic forming are Φ2.5~Φ3.6mm.

[0028] As a preferred option, online integrated processing includes stretching, scraping, cleaning, drying, polishing, and wire winding.

[0029] Preferably, the aluminum-silicon-strontium-titanium-zirconium alloy welding wire has a diameter of Ф0.8~Ф2.0mm and a tensile strength of 100~300MPa;

[0030] And / or, the elongation of the aluminum-silicon-strontium-titanium-zirconium alloy welding wire is ≥3%, and the weld elongation is ≥12%;

[0031] And / or, the strength of the weld after welding shall not be less than 0.65 times the strength of the weld substrate.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. This invention adds Sr and C elements to the alloy to refine the grains and achieve fine-grain strengthening; adds trace amounts of Ce and La rare earth elements to reduce the sensitivity of Fe to cracks during alloy casting, making rolling more stable and beneficial to improving the mechanical properties and weld strength of the alloy. Adding Ce and La elements can also reduce material burn-off, refine grains, and improve the plasticity and toughness of the material; at the same time, it has a modifying effect on Si, improving the processability of the welding material; adding Ti elements refines the grains and forms a reinforcing phase, improving the alloy strength; adding Mg elements can form the Mg2Si phase, which plays a role in refining the grains and hindering dislocation movement, improving the deformation resistance of the alloy.

[0034] 2. This invention adds Zr to the alloy to achieve the following effects: Zr has low solid solubility in the Al matrix, and its most significant effects are controlling grain size and morphology, inhibiting recrystallization, and improving alloy strength. Zr exists in aluminum alloys mainly in two ways:

[0035] (1) During casting, it is dissolved in the aluminum matrix and plays a role in solid solution strengthening;

[0036] (2) During solidification or homogenization, fine coherent or incoherent Al3Zr dispersed particles precipitate from the supersaturated solid solution, pinning grain boundaries and inhibiting recrystallization, while also playing a role in dispersion strengthening.

[0037] Therefore, the addition of Zr improves the mechanical properties of the welding wire. Al3Zr has a lattice constant close to that of α-Al and does not form a potential difference. The addition of Zr enhances the material's resistance to stress corrosion. According to regression analysis in production practice, the weld with added Zr has a more aesthetically pleasing shape and a better gloss.

[0038] 3. This invention adds Al-Ti-C wire online during the continuous casting and rolling process. By adding C element online, the segregation of C caused by addition in the furnace can be reduced, and the failure of Zr can be effectively reduced.

[0039] 4. The method for preparing aluminum-silicon-strontium-titanium-zirconium alloy welding wire of the present invention has the characteristics of a short process. On the one hand, it can greatly reduce the labor intensity of workers and improve production efficiency, thereby reducing the manufacturing cost of aluminum alloy welding wire materials. On the other hand, the aluminum alloy welding wire produced by this intelligent process has the advantages of stable performance, stable welding process, stable welding formation, high weld quality, less spatter, and low porosity, making it suitable for mass industrial production.

[0040] 5. The aluminum-silicon strontium-titanium-zirconium alloy welding wire of the present invention contains appropriate amounts of Sr, Ti, Zr, and Mg elements. During the remelting and resolidation process in welding applications, Sr, Ti, Zr, and Mg elements preferentially form a second phase and are dispersed in the weld melt, serving as nuclei to promote the internal nucleation of liquid metal in the weld, thereby refining the grain structure of the weld. Furthermore, the metal compounds generated by these three elements can appropriately increase the viscosity of the melt, improve the spatter phenomenon during aluminum alloy welding, and enhance the weld quality.

[0041] 6. Rare earth elements La and Ce have the function of purifying grain boundaries. For elements such as Li, Na, and Ca, which are brittle at high temperatures during welding applications, their damage to the weld can be reduced. Therefore, the content of Li+Na+Ca should be controlled below 0.01wt%. Ce has a better modification and refining effect than La. Silicon alloys require added elements to have better refining and modification effects. According to the previous research of this invention, when the weight ratio of Ce to La is (1.5~2.5):1, the alloy has better comprehensive performance.

[0042] 7. The aluminum-silicon-strontium-titanium-zirconium alloy welding wire provided by the present invention comprises the following components by mass percentage: Si: 4.50-5.50%; Mg: 0.01-0.05%; Sr: 0.02-0.50%; Ti: 0.01-0.15%; Zr: 0.01-0.20%; La: 0.01-0.10%; Ce: 0.01-0.15%; C: <0.0010%; the balance being Al and unavoidable impurity elements; the content of unavoidable impurity elements is less than 1.0 wt%. By controlling the alloy composition and the content of each component, the resulting welding wire exhibits excellent performance in terms of alloy mechanical properties, casting properties, grain refinement, and welding quality. Attached Figure Description

[0043] Figure 1 This is a schematic cross-sectional view of the aluminum-silicon-strontium-titanium-zirconium alloy welding wire of the present invention.

[0044] Figure 2 This is a flowchart illustrating the manufacturing process of the aluminum-silicon-strontium-titanium-zirconium alloy welding wire of the present invention.

[0045] Figure 1 In the diagram: 1: Al matrix; 2: Si; 3: Al4Sr; 4: Al3Ti; 5: Al3Zr; 6: Mg2Si; 7: La5Si4; 8: Ce5Si4; 9: Al 11 La3;10:Al 11 Ce3. Detailed Implementation

[0046] The following are specific embodiments of the present invention, which further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Unless otherwise specified, the raw materials used below are all commonly used in the art, and the methods used are all conventional methods in the art.

[0047] The following are definitions of some terms used in this invention:

[0048] The solid solution strengthening described in this invention refers to the phenomenon where alloying elements dissolve in the base metal, causing a certain degree of lattice distortion, thereby increasing the strength of the alloy. The solute atoms incorporated into the solid solution cause lattice distortion, which increases the resistance to dislocation movement, making slip difficult, thus increasing the strength and hardness of the alloy solid solution.

[0049] The grain refinement strengthening described in this invention refers to a method of improving material strength by refining the grain size. Experiments show that fine-grained metals at room temperature have higher strength, hardness, plasticity, and toughness than coarse-grained metals. This is because the plastic deformation of fine grains under external force can be dispersed within more grains, resulting in more uniform plastic deformation and less stress concentration. Furthermore, the finer the grains, the larger and more tortuous the grain boundaries, which is more unfavorable for crack propagation.

[0050] The modification treatment described in this invention refers to a method of improving material properties by adding a small amount of active material to molten metal to promote nucleation within the liquid metal or alter the crystal growth process. Commonly used modifiers in production include nucleating modifiers and adsorbent modifiers. The mechanism of nucleating modifiers is to add substances capable of generating non-spontaneous nuclei to the molten aluminum, allowing for heterogeneous nucleation during solidification to refine the grains. Adsorbent modifiers are characterized by accumulating at the phase interface during crystal growth, hindering crystal growth, and creating significant compositional supercooling, causing fine necking of crystal branches that facilitates melting and promotes crystal freeing and an increase in crystal nuclei.

[0051] The continuous casting and rolling process described in this invention refers to the process in which molten metal is cast into a billet by a casting wheel and then directly rolled into a round rod of a certain diameter by a rolling mill connected to the casting machine.

[0052] Example 1

[0053] The chemical composition and mass percentage of the aluminum-silicon-strontium-titanium-zirconium alloy in this embodiment include: Si: 4.70%; Mg: 0.02%; Sr: 0.025%; Ti: 0.02%; Zr: 0.05%; La: 0.02%; Ce: 0.04%; C: <0.0010%; the balance being Al and unavoidable impurity elements; the content of unavoidable impurity elements is less than 1.0 wt%.

[0054] The details are shown in Table 1.

[0055] The aluminum-silicon-strontium-titanium-zirconium alloy welding wire in this embodiment is prepared through the following steps:

[0056] (1) Batching: Batching is carried out according to the aluminum-silicon-strontium-titanium-zirconium alloy composition in Table 1;

[0057] (2) Smelting: The prepared raw materials are smelted at an alloy smelting temperature of 750℃. After the alloy is melted, it is degassed, refined and filtered online to reduce hydrogen, alkali metal elements and impurity particles in the melt.

[0058] (3) Continuous casting and rolling of billet rods: Before continuous casting and rolling, Al-Ti-C wire (Ti: 3%, C: 0.15%) is added to the molten metal. The diameter of the Al-Ti-C wire is Φ12.5mm, the addition speed is 15cm / min, and the addition amount is 0.15% of the total mass of the alloy batch. The billet is made by continuous casting and rolling process, the casting temperature is 700℃, and the specifications of the produced billet rod are Φ6.0mm, with a ladle weight of 2 tons.

[0059] (4) Homogenization annealing: adopt a 3-stage treatment: heat up to 500℃ within 4 hours and hold for 12 hours, then cool down to 100℃ within 4 hours and take it out of the furnace.

[0060] (5) Plastic processing: The annealed product is plastic processed to a size of Φ2.5mm.

[0061] (6) Online integrated processing: The plastically processed product is stretched, scraped, cleaned, dried, polished and wired to produce an aluminum-silicon-strontium-titanium-zirconium alloy welding wire with a final size of Φ1.2;

[0062] (7) Packaging and standing: Pack the finished product into smaller portions and let it stand.

[0063] A schematic diagram of the microstructure of the prepared aluminum-silicon-strontium-titanium-zirconium alloy welding wire is shown below. Figure 1 As shown in Table 2, the performance of the aluminum-silicon-strontium-titanium-zirconium alloy welding wire and the weld are shown in Table 3. The welding performance of the aluminum-silicon-strontium-titanium-zirconium alloy welding wire is shown in Table 3.

[0064] Examples 2-3

[0065] Compared with Example 1, the difference is that the aluminum-silicon-strontium-titanium-zirconium alloy is prepared according to Table 1.

[0066] The prepared aluminum-silicon-strontium-titanium-zirconium alloy welding wire was applied, and its weld performance is shown in Table 3.

[0067] Example 4

[0068] Compared with Example 1, the difference lies in that the aluminum-silicon-strontium-titanium-zirconium alloy is prepared according to Table 1, and the aluminum-silicon-strontium-titanium-zirconium alloy welding wire of this example is prepared through the following steps:

[0069] (1) Batching: Batching is carried out according to the aluminum-silicon-strontium-titanium-zirconium alloy composition in Table 1;

[0070] (2) Smelting: The prepared raw materials are smelted at an alloy smelting temperature of 730℃. After the alloy is melted, it is degassed, refined and filtered online to reduce hydrogen, alkali metal elements and impurity particles in the melt.

[0071] (3) Continuous casting and rolling of billet rods: Before continuous casting and rolling, Al-Ti-C wire (Ti: 5%, C: 0.15%) is added to the molten metal. The diameter of the Al-Ti-C wire is Φ9.5mm, the addition speed is about 15cm / min, and the addition amount is 0.10% of the total mass of the alloy batch. The billet is made by continuous casting and rolling process, the casting temperature is 695℃, and the specification of the produced billet rod is Φ6.0mm.

[0072] (4) Homogenization annealing: adopt a 3-stage treatment: heat up to 500℃ within 4 hours and hold for 14 hours, then cool down to 100℃ within 4 hours and take it out of the furnace.

[0073] (5) Plastic processing: The annealed product is plastic processed to a size of Φ3.2mm.

[0074] (6) Online integrated processing: The plastically processed product is stretched, scraped, cleaned, dried, polished and wound up to produce an aluminum-silicon-strontium-titanium-zirconium alloy welding wire with a final size of Φ1.6;

[0075] (7) Packaging and standing: Pack the finished product into smaller portions and let it stand.

[0076] The prepared aluminum-silicon-strontium-titanium-zirconium alloy welding wire was applied, and its weld performance is shown in Table 3.

[0077] Examples 5-6

[0078] Compared with Example 4, the difference is that the aluminum-silicon-strontium-titanium-zirconium alloy is prepared according to Table 1.

[0079] The prepared aluminum-silicon-strontium-titanium-zirconium alloy welding wire was applied, and its weld performance is shown in Table 3.

[0080] Comparative Examples 1-7

[0081] Compared with Example 1, the difference is that the aluminum-silicon-strontium-titanium-zirconium alloy is prepared according to Table 1.

[0082] The properties of the prepared aluminum-silicon-strontium-titanium-zirconium alloy welding wire and the weld are shown in Table 2.

[0083] Table 1. Chemical composition of aluminum-silicon-strontium-titanium-zirconium alloy welding wires in the examples and comparative examples.

[0084]

[0085] Table 2. Performance of aluminum-silicon-strontium-titanium-zirconium alloy welding wires and weld properties in Example 1 and Comparative Examples 1-6

[0086]

[0087] Table 3. Performance comparison between the welding wire of the present invention and commercially available welding wires

[0088] welding wire Welded tensile strength (melt metal strength) MPa Elongation in the weld state (%) Commercially available welding wire ER4043 165 11 Example 1 176 14 Example 2 178 13 Example 3 194 14 Example 4 186 14 Example 5 182 13 Example 6 185 14

[0089] (Note: The commercially available welding wire grade is ER4043, which is commonly used in the market; the base metal for welding is 6061-T6, with a strength of 240-320 MPa.)

[0090] According to Tables 1 and 2 above, in Comparative Example 1, the excessive addition of Ti led to Ti agglomeration during the smelting process, making casting difficult and preventing normal production. In Comparative Example 2, the absence of rare earth elements Ce and La resulted in poor Si modification, reduced melt purification capacity, and poor material processing properties, ultimately leading to low elongation of the welding wire. In Comparative Example 3, the absence of Ti, a refining metal element, resulted in difficulties in forming and low production efficiency during continuous casting and rolling, making it unsuitable for mass production. Furthermore, the absence of Mg in Comparative Example 3 reduced the strength of the welding wire and weld. In Comparative Example 5, the excessive addition of Mg led to poor material toughness and reduced usability of the welding material. In Comparative Examples 4 and 6, the excessive addition of Sr and Zr, refining metal elements, reduced the plasticity of the material and the plasticity (elongation) of the weld. In Comparative Example 7, the excessive addition of Si resulted in reduced welding wire strength and low weld strength.

[0091] As shown in Table 3 above, the present invention can obtain a high-performance aluminum-silicon-strontium-titanium-zirconium alloy welding wire with a weld strength that is more than 10 MPa higher than that of ordinary ER4043 welding wire. The welding wire has a high elongation rate and the weld plasticity is not reduced. After continuous casting and rolling, a mother rod with a package weight of up to 2 tons can be obtained, avoiding the welding problems and production efficiency problems of extrusion process. At the same time, the mother rod is smaller in size, and the manufacturing cost and equipment cost are lower than the existing continuous casting and rolling process.

[0092] In summary, the aluminum-silicon-strontium-titanium-zirconium alloy welding wire provided by this invention comprises the following components by mass percentage: Si: 4.50–5.50%; Mg: 0.01–0.05%; Sr: 0.02–0.50%; Ti: 0.01–0.15%; Zr: 0.01–0.20%; La: 0.01–0.10%; Ce: 0.01–0.15%; C: <0.0010%; the balance being Al and unavoidable impurity elements; the content of unavoidable impurity elements is less than 1.0 wt%. By controlling the composition of the welding wire and the content of each component, the resulting alloy exhibits superior mechanical properties, casting properties, grain refinement, and welding quality. This invention exhibits superior performance in terms of quantity, etc. It adds Sr and C elements to the alloy to refine the grain size; adds trace amounts of Ce and La rare earth elements to reduce Fe's sensitivity to cracking during alloy casting, resulting in more stable rolling and improved alloy mechanical properties and weld strength. The addition of Ce and La elements also reduces material burn-off, refines the grain size, and enhances the material's ductility and toughness; simultaneously, it modifies Si, improving the processability of the welding material; adds Ti elements to refine the grain size and form a reinforcing phase, increasing the alloy's strength; and adds Mg elements to form the Mg2Si phase, which refines the grain size and hinders dislocation movement, thus improving the alloy's deformation resistance.

[0093] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An aluminosilicate strontium titanium zirconium alloy, characterized in that, The composition and weight percentage of the alloy are as follows: Si: 4.50~5.50%; Mg: 0.01~0.05%; Sr: 0.02~0.50%; Ti: 0.01~0.15%; Zr：0.01~0.20%； La: 0.01~0.10%; Ce: 0.01~0.15%; C: <0.0010%; balance is Al and unavoidable impurity elements; unavoidable impurity element content is less than 1.0 wt% The weight ratio of Ce to La is (1.5~2.5):1; The impurity elements include: Zn≤0.01wt%, Sb≤0.015wt%, Bi≤0.015wt%, Cr≤0.05wt%, Fe≤0.50wt%, Ni≤0.05wt%, Ba≤0.01wt%, Sn≤0.05wt%, Ga≤0.05wt%, P≤0.02wt%, V≤0.03wt%, Li≤0.001wt%, Na≤0.05wt%, Ca≤0.005wt%; wherein, Li+Na+Ca≤0.01wt%. The above alloy components are sequentially processed through batching, melting, continuous casting and rolling to form billets, annealing, plastic processing, online integrated processing, packaging, and settling to obtain aluminum-silicon-strontium-titanium-zirconium alloy welding wire; In the continuously cast and rolled billet, Al-Ti-C wire is added, wherein the content of C element in the Al-Ti-C wire is 0.05~0.5% and the content of Ti element is 2~6%; the amount of Al-Ti-C wire added is 0.05~0.50% of the total mass of the alloy ingredients.

2. The aluminum-silicon-strontium-titanium-zirconium alloy of claim 1, wherein, The chemical composition and mass percentage of the aluminum-silicon-strontium-titanium-zirconium alloy are as follows: Si: 4.70%; Mg: 0.02%; Sr: 0.025%; Ti: 0.02%; Zr: 0.05%; La: 0.02%; Ce: 0.04%; C: <0.0010%; the balance is Al and unavoidable impurity elements; the content of unavoidable impurity elements is less than 1.0 wt%.

3. An aluminum-silicon-strontium-titanium-zirconium alloy welding wire as described in claim 1, wherein the diameter of the aluminum-silicon-strontium-titanium-zirconium alloy welding wire is Ф0.8~Ф2.0mm and the tensile strength is 100~300MPa; And / or, the elongation of the aluminum-silicon-strontium-titanium-zirconium alloy welding wire is ≥3%, and the weld elongation is ≥12%; And / or, the strength of the weld after welding shall not be less than 0.65 times the strength of the weld substrate.

4. A method of making an aluminum-silicon-strontium-titanium-zirconium alloy welding wire, characterized by, The preparation method includes: sequentially batching, melting, continuous casting and rolling of the aluminum-silicon-strontium-titanium-zirconium alloy as described in claim 1, annealing, plastic processing, online integrated processing, packaging, and settling; during the continuous casting and rolling process, Al-Ti-C wire is added after online filtration and before casting, with the Al-Ti-C wire diameter being Φ7.5~Φ12.5mm and the addition speed being 5~100cm / min; The Al-Ti-C wire contains 0.05-0.5% C and 2-6% Ti; the amount of Al-Ti-C wire added is 0.05-0.50% of the total mass of the alloy ingredients. The casting temperature in the continuous casting and rolling billet is 650~710℃; The annealing process adopts a three-stage treatment: the temperature is raised to 485~520℃ within 0.5~5h and held for 1.5~18h, and then cooled to 60~100℃ within 2~10h before being taken out of the furnace.

5. The method of making an aluminum-silicon-strontium-titanium-zirconium alloy welding wire of claim 4, wherein, The preparation method includes: (1) Batching: The aluminum-silicon-strontium-titanium-zirconium alloy is batched according to the composition; the chemical composition and mass percentage of the aluminum-silicon-strontium-titanium-zirconium alloy include: Si: 4.70%; Mg: 0.02%; Sr: 0.025%; Ti: 0.02%; Zr: 0.05%; La: 0.02%; Ce: 0.04%; C: <0.0010%; the balance is Al and unavoidable impurity elements; the content of unavoidable impurity elements is less than 1.0 wt% (2) Smelting: The prepared raw materials are smelted. The alloy smelting temperature is 750℃. After the alloy is melted, it is degassed, refined and filtered online to reduce hydrogen, alkali metal elements and impurity particles in the melt. (3) Continuous casting and rolling of billet rods: Before continuous casting and rolling, Al-Ti-C wire is added to the molten metal, wherein Ti: 3%, C: 0.15%, the diameter of Al-Ti-C wire is Φ12.5mm, the addition speed is 15cm / min, and the addition amount is 0.15% of the total mass of alloy materials; the billet is made by continuous casting and rolling process, the casting temperature is 700℃, the specifications of the produced billet rod are Φ6.0mm, and the weight of the billet is 2 tons; (4) Homogenization annealing: adopt 3-stage treatment: heat up to 500℃ within 4 hours and hold for 12 hours, then cool down to 100℃ within 4 hours and take out of the furnace; (5) Plastic processing: The annealed product is plastic processed, and the specification after plastic processing is Φ2.5mm; (6) Online integrated processing: The plastically processed product is stretched, scraped, cleaned, dried, polished and wired to produce an aluminum-silicon-strontium-titanium-zirconium alloy welding wire with a final size of Φ1.2.

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