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Aluminium-alloy welding wire and preparation method thereof

An aluminum alloy welding wire and alloy technology, applied in the field of alloys, can solve the problems of welding wire composition deviation, increase production cost, prolong production cycle, etc., improve tensile strength and yield strength, improve wear resistance and corrosion resistance, and achieve accurate control effect

Active Publication Date: 2012-10-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] (1) Si is added in the form of an intermediate alloy during smelting. Although the Si element is easy to dissolve, it is also very easy to cause deviation of the welding wire composition and introduce impurities;
[0017] (2) A large number of iron tools are used in the smelting process, which increases the content of impurity Fe elements and reduces the mechanical properties and corrosion resistance of welding wire. In order to eliminate the adverse effects of Fe elements, the additional addition of Mn elements also increases production costs;
[0018] (3) Although the homogenization treatment of ingots for 16 hours can eliminate non-equilibrium crystallization, dissolve segregated intermetallic compounds, and eliminate internal stress, it also consumes a lot of energy, prolongs the production cycle, and greatly improves production. cost;
[0019] (4) Scraping the surface of the welding wire after annealing can temporarily eliminate the oxide film, but it is very easy to scratch the surface of the welding wire, causing dimensional deviation, and at the same time, it cannot prevent the formation of a new oxide film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Ingredients: Si: 12.5%, Mg: 0.38%, Fe: 0.31% by weight of the alloy components, and the balance is Al, where Al and Mg are added in the form of pure metal, and Si is added in the form of industrial silicon , the purity of Al is 99.93wt%, the purity of Si is 99.3wt%, and the purity of Mg is 99wt%. After the required alloy components are accurately weighed, they are placed in a drying box to dry, and are packaged in a plastic bag;

[0056] (2) Smelting: first add metal Al and heat it to a molten state, divide Si into two parts evenly, when the temperature of the melting furnace rises to 760°C, use a full titanium pressure cover to press a part of Si into the molten aluminum, so that Suspend it at 1 / 3 of the bottom of the crucible, stir for 1 minute, then raise the temperature to 800°C and keep it warm for 15 minutes. After adding another part of Si, add metal Mg. When adding, wrap metal Mg with aluminum foil to avoid In the process of adding the aluminum liquid surfac...

Embodiment 2

[0066] (1) Ingredients: according to the weight percentage of each alloy component Si: 12.8%, Mg: 0.68%, Fe: 0.10%, and the balance is Al, where Al and Mg are added in the form of pure metal, and Si is added in the form of industrial silicon , the purity of Al is 99.93wt%, the purity of Si is 99.3wt%, and the purity of Mg is 99wt%. After the required alloy components are accurately weighed, they are placed in a drying box to dry, and are packaged in a plastic bag;

[0067] (2) Smelting: first add metal Al and heat it to a molten state, divide Si into two parts evenly, when the temperature of the smelting furnace rises to 800°C, use a full titanium pressure cover to press a part of Si into the molten aluminum, so that Suspend it at 1 / 3 of the bottom of the crucible, and stir for 1 minute, then keep it warm at 800°C for 15 minutes. After adding another part of Si, add metal Mg. When adding, wrap metal Mg with aluminum foil to prevent it from being added. The aluminum liquid surf...

Embodiment 3

[0077] (1) Ingredients: Si: 12.8%, Mg: 1.03%, Fe: 0.12% by weight of the alloy components, and the balance is Al, where Al and Mg are added in the form of pure metal, and Si is added in the form of industrial silicon , the purity of Al is 99.93wt%, the purity of Si is 99.3wt%, and the purity of Mg is 99wt%. After the required alloy components are accurately weighed, they are placed in a drying box to dry, and are packaged in a plastic bag;

[0078] (2) Smelting: first add metal Al and heat it to a molten state, divide Si into two parts evenly, when the temperature of the melting furnace rises to 780°C, press a part of Si into the molten aluminum with a full titanium pressure cover, so that Suspend it at 1 / 3 of the bottom of the crucible, stir for 1 minute, then raise the temperature to 800°C and keep it warm for 15 minutes. After adding another part of Si, add metal Mg. When adding, wrap metal Mg with aluminum foil to avoid In the process of adding the aluminum liquid surface,...

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Abstract

The invention relates to the technical field of alloy, in particular to an aluminium-alloy welding wire and a preparation method thereof. The welding wire comprises the following components in percentage by weight: 12.5-12.8% of Si, 0.38-1.03% of Mg, less than or equal to 0.4% of Fe and the balance of Al. The preparation method comprises the following steps of: batching, smelting, casting, extruding, drawing, annealing, surface treatment and package. The invention has the advantages that pure silicon is added in the smelting process, a full-titanium smelting tool is used, and no any alterant is added; a continuous uniformization process is adopted before extrusion, and the long-time insulation and the heating process before extrusion in the traditional uniformization are eliminated, so that the time and the energy are greatly saved, and the production cost is reduced; the surface treatment is carried out on the welding wire by adopting a chemical method, so that oil stains are thoroughly removed, the surface scratching is avoided, and the generation of new oxidation films is prevented; after being welded by the welding wire, the mechanical property of a joint is excellent; after heat treatment, the tensile strength of the joint is obviously improved and the joint has heat-treatable enhancing property.

Description

technical field [0001] The invention relates to the field of alloy technology, in particular to an aluminum alloy welding wire and a preparation method thereof. Background technique [0002] The extensive application of aluminum alloy welded parts in lightweight equipment has put forward higher requirements for the welding quality of aluminum alloys. The existing near-eutectic aluminum-silicon alloy welding mostly uses SAl4047 welding wire with a composition similar to that of the base metal, but the tensile strength of the joint after welding is difficult to reach more than 90% of the strength of the base metal, and the joint after welding cannot be strengthened by heat treatment. Using traditional SAl4047 aluminum alloy welding wire to weld near-eutectic aluminum-silicon alloys has been unable to obtain higher welding quality, which seriously restricts the wide application of high-silicon aluminum alloys. [0003] The chemical composition (wt%) of the SAl4047 [chemical co...

Claims

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Application Information

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IPC IPC(8): B23K35/28B23K35/40C22C21/02
Inventor 何长树王浩李恒奎赵骧赵刚于福晓左良
Owner NORTHEASTERN UNIV
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