A welding wire linear stabilization method for manufacturing aluminum-magnesium alloy welding wire and aluminum-magnesium alloy welding wire prepared by the method

Abstract

The present invention belongs to the technical field of aluminum alloy welding wires, and relates to a welding wire linear stabilization method for manufacturing aluminum-magnesium alloy welding wires and the aluminum-magnesium alloy welding wires prepared therefrom. The welding wire linear stabilization method comprises the following steps: performing step annealing on the finished aluminum-magnesium alloy welding wire, the annealing temperature is 50 to 135°C, and the welding wire is kept at the annealing temperature for 3 to 24 hours, and the finished aluminum-magnesium alloy welding wire has a specification of 0.8 to 2.0 mm. The present invention uses a low-temperature step annealing process to process the finished aluminum-magnesium alloy welding wire whose outer diameter dimension tolerance has reached the welding requirements, stabilize the internal structure of the material, and optimize the performance of the welding wire material.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum alloy welding wires, and relates to a welding wire linear stabilization method for manufacturing aluminum-magnesium alloy welding wires and the aluminum-magnesium alloy welding wires prepared therefrom. Background Art

[0002] As my country's economy is in a critical period of transformation from old to new drivers and international competition is increasingly intensifying, aluminum and aluminum alloys, as an important basic raw material, play a particularly important role. Aluminum and aluminum alloy processed materials are usually in the form of tubes, rods, wires, plates, strips, and foils and are widely used in the fields of electricity, transportation, construction, machinery, electronic information, aerospace, and national defense and military industries, playing an indispensable role in ensuring national economic construction and social development.

[0003] In recent years, with the accelerated pace of optimization and upgrading of my country's industrial structure and the gradual popularization of energy-saving and consumption-reducing policies, and with the development of industries such as rail transit, automobile industry, aerospace and military industry towards lightweight, the demand for high-performance aluminum and aluminum alloy welding wire products (hereinafter referred to as aluminum welding wire) continues to grow.

[0004] In just over a decade of development, my country has become the country with the longest high-speed rail mileage in the world. Based on the solid foundation of independent research and development, China's high-speed rail has independently developed the "Fuxing" EMU in recent years through learning, absorbing, introducing and re-innovating. The trains cover various levels of speed from 200 to 350 kilometers per hour, with various types of models for high-cold, high-temperature, and plateau, which can well meet different needs at home and abroad.

[0005] The lightweight design of high-speed EMU body can not only reduce material costs, but also significantly reduce vehicle manufacturing costs and train track maintenance costs. Lightweight design mainly involves the application of lightweight and high-strength materials and the optimization of body structure design. At present, the body section is made of large hollow aluminum profiles extruded and welded, with long and regular interfaces, which is convenient for automated operation. Therefore, various automatic welding technologies are widely used in this industry.

[0006] The performance of the aluminum alloy car body welding structure, under the condition of a certain base material, mainly depends on the welding process and the alloy composition and properties of the welding materials. Among them, the welding materials are important factors affecting the weld metal composition, structure, hot cracking of the base material in the near-seam area, corrosion resistance and mechanical properties of the weld. At the same time, in order to realize robot automated inert gas shielded arc welding (MIG welding) and ensure the wire feeding stability during welding, higher requirements are put forward for aluminum alloy welding materials, requiring the robot automated coiling welding materials to be precise in size, bright and clean on the surface, and have a certain rigidity. Therefore, the high-level development of my country's rail transit vehicle equipment urgently requires independent research and development of high-quality aluminum alloy welding materials.

[0007] Domestic aluminum alloy raw material smelting, brightening and surface treatment processes are backward, and currently only low-end aluminum welding wires can be produced for welding of non-critical structures and non-high performance aspects, which cannot meet the welding manufacturing needs of high-end equipment. Therefore, in order to meet the manufacturing needs of high-end equipment in my country, it is urgent to localize high-end aluminum welding wires and develop patented products with independent intellectual property rights.

[0008] Aluminum alloy welding wire is the key to inert gas shielded arc welding of aluminum and aluminum alloys. To obtain excellent welding quality, high-quality aluminum welding wire is required. The preparation of aluminum welding wire requires optimal component design, as well as optimized preparation process design and product design. Compared with imported welding wire, domestic welding wire has the disadvantages of low weld strength after welding, more internal pores and inclusions, poor welding wire stability, and poor surface quality.

[0009] Since high-end aluminum alloy welding materials have long relied on imports, an invisible and tangible industrial chain has been formed in China. A matching relationship has been formed with imported welding materials in terms of welding equipment, welding tooling, etc. On the other hand, an invisible match with imported welding wires has also been formed in terms of welding technology and welding techniques. In order to better replace imports and achieve independent control, the aluminum alloy welding materials manufactured by the manufacturers who enter later must have a good match with welding equipment, welding tooling, and welding technology.

[0010] The following describes the main technical conditions of aluminum welding wire at home and abroad:

[0011] (1) Ingredients

[0012] In the field of traditional lightweight high-end equipment, 5XXX series aluminum-magnesium alloy welding wires are the most widely used. The typical grades are ER5356 and ER5087. During use, there are problems such as low welding strength and coarse weld structure. At present, China has added Sc to refine the grains and improve the strength of the weld. However, the processing performance of the aluminum-magnesium alloy after adding Sc is poor and it cannot be used in industrial manufacturing at this stage, such as patent CN103286471B; the weld strength is improved by increasing the Mg content and Zn element, such as patent CN103286472B.

[0013] On the other hand, according to the international standards ISO18273~2015: the zirconium content of other 5XXX series aluminum-magnesium alloy welding wires, such as Al5087 and Al5187, is generally greater than 0.1%. Under non-vacuum conditions, because the metal vapor pressure of zirconium is relatively low, the actual yield of zirconium during smelting is relatively low. In order to ensure that the zirconium composition meets the requirements of the standard, the proportion of zirconium added will be much higher than that of other conventional metals, or a special smelting method will be used, which will lead to increased costs during actual production.

[0014] (2) Preparation process

[0015] Foreign aluminum welding wire is generally manufactured by the following methods:

[0016] Melting→continuous casting and rolling Φ9.5→wire drawing (including multiple annealing)→finished product.

[0017] This process can produce a Φ9.5 mother rod with a large package weight and uniform and fine structure, and further obtain a finished aluminum welding wire with higher quality and more stable quality. There are also studies on continuous casting and rolling processes in China, such as patent CN106244861A. However, the mother rod specification after hot rolling is Φ9.5mm, while the commonly used welding wire specification is Φ1.2mm. The subsequent processing process is long and the stability of the process is difficult to guarantee.

[0018] Domestic aluminum welding wire is generally produced by the following two processes:

[0019] ① Melting → horizontal continuous casting Φ9.5 → wire drawing (including multi-pass annealing) → finished product;

[0020] The characteristics of this process are as follows: First, it is impossible to carry out effective online treatment of the melt, and the wire has many inclusions and high hydrogen content, which leads to defects such as pores and inclusions in the weld during welding, affecting the quality of welding; second, the Φ9.5 wire rod produced by this process method is a cast structure, which has many casting defects inside, such as large particle compounds, looseness and holes and other casting defects. The casting defects of the mother rod cannot be eliminated only by the subsequent stretching, and these defects will affect the welding process and weld quality. Therefore, this process can only produce low-end aluminum welding wire.

[0021] ② Melting → semi-continuous casting → extrusion Φ9.5 → wire drawing (including multi-pass annealing) → finished product;

[0022] The characteristics of this process are as follows: Due to the influence of the ingot length, the weight of each roll of mother rod does not exceed 100kg. Each roll of wire needs to be physically connected together before subsequent stretching. Too many joints not only waste time but also the performance of the wire joints is different from that of the wire, affecting the overall consistency of the wire. At the same time, due to the limitations of the extrusion process, during the extrusion process, the blank will produce coarse-grained structure on the surface of the wire rod due to the excessively high extrusion temperature. It is difficult to eliminate it in subsequent processing, and the coarse-grained structure remaining on the surface of the welding wire is harmful to the melting performance.

[0023] Due to the limitations of process and welding material storage conditions, production conditions, and technical level, domestic welding wires still lag behind imported welding wires in terms of welding wire performance consistency and welding wire linear stability, and cannot fully meet the requirements of aluminum alloy welding materials for high-end equipment. Therefore, it is urgent to research a new technology to meet the MIG welding requirements in the high-end field. Summary of the invention

[0024] In view of the deficiencies in the prior art, the present invention provides a welding wire linearity stabilization method for manufacturing aluminum-magnesium alloy welding wire. The aluminum-magnesium alloy welding wire prepared by the method has good linearity, stable welding process and good forming performance.

[0025] One object of the present invention is achieved by the following technical solutions:

[0026] A welding wire linear stabilization method for manufacturing aluminum-magnesium alloy welding wire, the welding wire linear stabilization method comprising the following steps: performing step annealing on the finished aluminum-magnesium alloy welding wire, the annealing temperature is 50-135°C, and keeping the temperature at the annealing temperature for 3-24 hours. The low-temperature step annealing process technology created by the present invention is to process the aluminum-magnesium alloy welding wire whose outer diameter dimension tolerance has reached the welding requirement, stabilize the internal structure of the material, optimize the performance of the welding wire material, and the processing process does not change the diameter and surface finish of the welding wire.

[0027] In order to stabilize the surface roughness of the welding wire and the linear stability after treatment and meet the automatic wire feeding requirements of MIG welding, the low temperature section and high temperature section of low temperature annealing are controlled separately. During the step annealing process, the heating rate is 25-35℃ / hour when the temperature is less than 50℃, and the heating rate is 5-15℃ / hour when the temperature is greater than 50℃.

[0028] Preferably, the step annealing control pressure is 0.9 to 1.2 atmospheres.

[0029] Preferably, the specification of the finished aluminum-magnesium alloy welding wire is Φ0.8~Φ2.0mm.

[0030] The annealing system to be adopted is determined by the characteristics of the material composition and organization. The linear stabilization method of the welding wire of the present invention is applicable to the finished aluminum-magnesium alloy welding wire with the following mass percentages: magnesium: 4.5-5.2wt%; manganese: 0.75-1.10wt%; chromium: 0.05-0.20wt%; zirconium: 0.10-0.15wt%; carbon: 0.0001-0.0050wt%; one or more of Li, Na, K, Ca, Rb, Cs, any one of which has a content of less than 0.001wt%, trace elements W1 and trace elements W2; the remainder is aluminum and unavoidable impurity elements;

[0031] The trace element W1 is two or more of P, La, Ba, V, Ga, and Ti; the trace element W2 is two or more of Cu, Be, Nb, Ag, In, and Ni.

[0032] Preferably, the mass percentage of the trace element W1 is 0.03-0.25 wt %; and / or the mass percentage of the trace element W2 is 0.01-0.20 wt %.

[0033] Preferably, the content of impurity elements is less than 0.50 wt %.

[0034] Preferably, the impurity elements include the following elements in mass percentage: Pb≤0.20wt%, Sb≤0.015wt%, Bi≤0.015wt%, Te≤0.015wt%, S≤0.015wt%, Fe≤0.030wt%, Si≤0.015wt%, and Zn≤0.035wt%.

[0035] Preferably, the mass ratio of Fe to Si is (2-3):1.

[0036] Preferably, the mother rod of the aluminum-magnesium alloy welding wire is manufactured by continuous casting and rolling, and the specification of the mother rod is Φ3.5 to Φ7.5 mm.

[0037] Preferably, the finished aluminum-magnesium alloy welding wire is prepared by a method comprising the following steps: smelting, continuous casting and rolling to obtain an aluminum-magnesium alloy welding wire mother rod, plastic processing of the mother rod, annealing, plastic deformation, peeling, and packaging; the specification of the aluminum-magnesium alloy welding wire mother rod manufactured by continuous casting and rolling is Φ3.5~Φ7.5mm.

[0038] Preferably, the finished aluminum-magnesium alloy welding wire is prepared by a method comprising the following steps:

[0039] Melting and solution treatment: Aluminum and magnesium are added in the form of pure metals, and other added elements are added in the form of aluminum-based master alloys, which are prepared according to mass percentage and melted. The alloy melting temperature is 670-760°C. After the alloy is melted, it is degassed, refined and filtered online to reduce hydrogen, alkali metal elements and impurity particles in the solution. The casting process in the continuous casting and rolling adopts the method of adding chloride salt and chlorine for refining;

[0040] The aluminum-magnesium alloy welding wire mother rod is obtained by continuous casting and rolling: the continuous casting temperature is 680-750°C, the hot rolling temperature is 370-420°C, and the specification of the aluminum alloy mother rod after rolling is Φ3.5-Φ7.5;

[0041] Mother bar plastic processing: Plastic processing is performed on the prepared mother bar to obtain an aluminum alloy busbar with a specification of Φ2.0 to Φ4.0 mm;

[0042] Annealing: annealing the obtained busbar at a temperature of 370-480°C for 8-18.0 hours;

[0043] Plastic deformation: The obtained busbar is subjected to plastic deformation at a large processing rate to obtain an aluminum alloy pre-formed billet, and the processing rate is greater than 65% and less than 85%.

[0044] Peeling and packaging: The aluminum alloy pre-formed billet is peeled with a peeling thickness of 0.01 to 0.15 mm to obtain the finished aluminum-magnesium alloy welding wire with a specification of Φ0.8 to Φ2.0 mm. After that, the finished aluminum welding wire of different weights is packaged according to the different needs of customers.

[0045] The step annealing of the present invention is carried out after obtaining the wire diameter specification required by the finished aluminum-magnesium alloy welding wire, without changing the dimensional tolerance of the welding wire surface. The annealing temperature is controlled to be 50-135°C, and the temperature is kept at the annealing temperature for 3-24 hours. The heating rate is 25-35°C / hour when the temperature is less than 50°C, and the heating rate is 5-15°C / hour when the temperature is greater than 50°C.

[0046] Another object of the present invention is achieved by the following technical solutions:

[0047] An aluminum-magnesium alloy welding wire is prepared by the above welding wire linear stabilization method. The aluminum-magnesium alloy welding wire with performance requirements that meet the MIG welding requirements is prepared by the above welding wire linear stabilization method, and the aluminum-magnesium alloy welding wire has the following characteristics:

[0048] (1) The diameter of the aluminum-magnesium alloy welding wire is Φ0.8~Φ2.0mm, the spring diameter of the aluminum-magnesium alloy welding wire is Φ350~Φ800mm, and the warpage is less than 10mm;

[0049] (2) The diameter of the aluminum-magnesium alloy welding wire is Φ0.8~Φ2.0mm, the tensile strength is 440~520Mpa, and the weld strength (molten metal strength) after cladding is not less than 0.63 times the strength of the welding wire.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] (1) The present invention increases the Mg content and has the following effects:

[0052] ① The magnesium in the welding wire has a significant strengthening effect. The solid solubility of Mg in aluminum is very large. During the solidification process, Mg precipitates from the Al matrix in the form of Al5Mg8 phase and is evenly distributed in the Al matrix, playing a role of precipitation strengthening;

[0053] ② Because Mg is more active than Al and is prone to burnout during welding, increasing the Mg content in the welding wire can also increase the Mg content in the weld after welding, making the Mg content in the weld higher than the Mg content of the commonly used base material, thereby ensuring the strength of the weld;

[0054] ③ Increasing the Mg content will increase the strength of the material while also reducing the plasticity of the material, but the Mg element is prone to uneven distribution. The present invention improves the plasticity of the material by adding a combination of multiple elements and controlling impurity elements such as a combination of Mn, Cr, Zr, and C elements, controlling alkali metal elements, controlling the ratio of Fe and Si, and grain refinement.

[0055] ④ Avoid uneven distribution of Mg through grain refinement and casting process; the uniform distribution of Mg can be optimized by controlling the ratio of Fe and Si according to the present invention.

[0056] (2) The present invention improves the grain refining effect of Ti by adding a certain amount of C element, thereby increasing the nucleation rate of Ti element in the crystal and reducing the precipitation of impurity elements at the grain boundary. At the same time, C also has the following effects.

[0057] ① During smelting and casting, aluminum and aluminum alloys are very easy to adsorb / absorb water in the air. When aluminum is smelted, water decomposes into hydrogen and oxygen. If no special treatment method is adopted, the oxygen and hydrogen remaining in the solution will chemically react with the base metal and greatly reduce the mechanical properties of the material. The present invention reduces this deficiency by adding carbon. C will oxidize with oxygen above 400°C, reduce the oxygen content in the solution, and improve the mechanical properties of the material.

[0058] ② During the solidification process, TiC2 hard phase is formed at the grain boundary, which acts as a hard particle to pin dislocations, hinder dislocation movement, and improve the deformation resistance of the alloy.

[0059] ③ Further eliminate the hazards of metals such as Li, Na, Ca, and K, because the role of TiC2 in refining grains is to dissolve the above metals in the form of metal atoms in α grains, reducing the segregation of these metal elements at the grain boundaries and leading to a decrease in the mechanical and electrical properties of the material.

[0060] (3) The present invention controls the ratio of Fe and Si elements, and the ratio of Fe and Si is configured as (2-3):1, which plays a role in stabilizing the alloy phase ratio during the manufacturing process of the welding wire.

[0061] (4) The present invention adds a certain amount of trace elements W1: two or more of P, La, Ba, V, Ga, and Ti. The trace element W1 is mainly used to modify the solution, refine the grains, and achieve the effect of fine grain strengthening. Among them, La, V, Ga, and Ti are used as nucleation modifiers. During the solidification process of the aluminum solution, they act as crystal nuclei to promote nucleation inside the liquid metal and form fine grains. The Ba element obtains fine grains by inhibiting the growth of grains during solidification. In addition, the P element can also be used as a deoxidizer to remove oxygen from the solution, and can also react chemically with impurities in the solution to purify the solution. As the degree of solution purification increases, the electromechanical properties of the solution will also improve accordingly.

[0062] (5) The present invention adds a certain amount of trace elements W2: two or more of Cu, Be, Nb, Ag, In, and Ni, wherein the Ag element has a large solid solubility in Al and has a solid solution strengthening effect; Ni has a precipitation strengthening effect; Cu and Mg form a MgCu second phase, which plays a strengthening role as a hard phase; Be will form a BeO film on the surface of the solution to protect the solution from further oxidation and reduce burning during the smelting process; Nb and In elements play a role in refining the grains and inhibiting the growth of the grain size of aluminum, thereby improving the electromechanical properties of the material.

[0063] (6) The present invention adds chloride salt or chlorine gas refining agent to react with alkali metal elements Li, Na, K, Rb, Cs and Ca to generate corresponding compounds to reduce the content of the corresponding elements in the solution. It is beneficial to control the content of any one of Li, Na, K, Rb, Cs to less than 0.001wt%, which improves the performance of the material.

[0064] (7) Determining the contents of impurity elements such as Pb≤0.20wt%, Sb≤0.015wt%, Bi≤0.015wt%, Te≤0.015wt%, S≤0.015wt%, and Zn≤0.035wt% is to restrict the types of aluminum ingots and intermediate alloys selected for manufacturing the aluminum alloy welding wire of the present invention, thereby ensuring that the physical and chemical properties of the welding wire are not affected by the impurities in the raw materials and the alloy properties are not reduced.

[0065] (8) The present invention adopts continuous casting and rolling to produce Φ3.5-Φ7.5 aluminum alloy mother rods. This method has high production efficiency, uniform and fine product structure, and stable quality. Compared with the horizontal continuous casting process, there are fewer internal pores and inclusions. Compared with the extrusion process, it has the following advantages:

[0066] ① It is possible to obtain large-bale mother rods with stable performance. The mother rod package weight can reach 2 tons. Each package of materials does not need to be connected together for production, and there will be no connection points in the final product. At the same time, the time for connecting the mother rods is eliminated, which improves efficiency;

[0067] ② Taking the production of ER5087 mother rod as an example, the continuous casting and rolling line speed is above 4m / s, while the extrusion line speed of Φ9.5 mother rod is about 0.3m / s. At the same time, there is also loading and unloading time in the extrusion process, so the continuous casting and rolling method adopted by the present invention has greatly improved production efficiency. Compared with the continuous casting and rolling process abroad: the specifications of the mother rod after rolling are smaller, and the number of processing passes required for subsequent processing to the finished product specifications is correspondingly shortened. At the same time, because the rolling specifications are smaller, the size of the corresponding rolling and casting equipment is smaller, the equipment investment and floor space are smaller, and the production cost and equipment investment cost are lower.

[0068] (9) Because the welding wire produced by the present invention adopts a low-temperature step annealing system, the internal stress of the welding wire is fully released, the second phase of the material is fully precipitated, and the chemical composition within the crystal and between the crystals is more stable. This is reflected in the appearance that the ring diameter and warping of the welding wire are more stable, meeting the resistance requirements of MIG welding during wire feeding and the stability of the rod length during welding, thereby ensuring the forming performance and welding processability of the welding wire during welding.

[0069] (10) A low-temperature step annealing system is adopted to make the second phase in the weld more stable when the welding wire is re-melted and re-solidified to form the weld structure during welding application. Mn, Cr, Zr, and Ti elements will preferentially form the second phase during the re-solidification process and be distributed in the weld solution. They act as crystal nuclei to promote the internal nucleation of the liquid metal in the weld, thereby refining the grain size of the weld structure. The welding wire after low-temperature annealing can make the second phase produced by the above elements more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 This is a schematic diagram of the structure of the aluminum-magnesium alloy welding wire prepared by the present invention;

[0071] In the figure, 1: α-Al; 2: Mg2Si; 3: Al2Zr3; 4: (Fe, Mn, Cr)Al x ; 5:Mg3Al2; 6:Ti2C. DETAILED DESCRIPTION

[0072] The technical scheme of the present invention is further described below by specific examples and accompanying drawings. It should be understood that the specific examples described herein are only used to help understand the present invention and are not intended for specific limitations of the present invention. The accompanying drawings used herein are only for better illustrating the disclosure of the present invention and do not have a limiting effect on the scope of protection. If not otherwise specified, the raw materials used in the embodiments of the present invention are all commonly used raw materials in the art, and the methods used in the embodiments are all conventional methods in the art.

[0073] The following are definitions of some terms used in this invention:

[0074] The intermediate alloy described in the present invention refers to a special alloy with a metal as the matrix and one or more single substances added thereto to solve the problems of easy burning of the single substance, difficulty in melting at a high melting point, easy segregation due to high density, etc., or to improve the performance of the alloy. It is an additive functional material.

[0075] The solution treatment described in the present invention refers to: removing harmful substances such as gas, inclusions, alkali metal elements, etc. in the solution by means of gas, refining agent, filtering, etc., so that the solution is purified.

[0076] The alkali metal elements described in the present invention refer to the six metal elements in Group IA of the periodic table except hydrogen (H), namely lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs). Alkali metals all have an outermost electron belonging to the s orbital, and their chemical properties show very obvious homologous behavior.

[0077] The solid solution strengthening described in the present invention refers to the phenomenon that alloy elements are dissolved in the matrix metal to cause a certain degree of lattice distortion, thereby improving the strength of the alloy; the solute atoms dissolved in the solid solution cause lattice distortion, and the lattice distortion increases the resistance to dislocation movement, making slip difficult, thereby increasing the strength and hardness of the alloy solid solution.

[0078] The grain refinement strengthening described in the present invention refers to a method of improving material strength by refining grains. 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 forces can be dispersed in more grains, the plastic deformation is more uniform, and the stress concentration is smaller. In addition, the finer the grains, the larger the grain boundary area, the more tortuous the grain boundary, and the less conducive to the expansion of cracks.

[0079] The precipitation strengthening described in the present invention refers to the hardening caused by the solute atom segregation area of ​​the metal in the supersaturated solid solution and (or) the dissolution of the metal particles dispersed in the matrix. It is strengthened by precipitating dispersed second phase precipitate particles that can hinder the movement of dislocations.

[0080] The modification treatment described in the present invention refers to a method of adding a small amount of active substance to the molten metal to promote nucleation inside the liquid metal or change the crystal growth process to obtain fine casting grains, thereby improving the material properties. Commonly used modifiers in production include tangible nucleation modifiers and adsorption modifiers. The mechanism of action of the nucleation modifier is to add a substance that can produce non-spontaneous nuclei to the aluminum solution, so that it can achieve the purpose of grain refinement through heterogeneous nucleation during the solidification process. The characteristic of the adsorption modifier is that it is enriched on the phase interface during crystal growth, hindering the growth of the crystal, and can form a larger component supercooling, so that the crystal branches form a thin neck and are easy to melt, promoting the liberation of the crystal and the increase of the nucleus.

[0081] The welding wire linearity described in the present invention includes the diameter of the welding wire in a free state, the twist of the welding wire in a naturally flattened state (called Helix in English), and the twist is replaced by the warping index in the present invention, that is, the height of the free end of the welding wire from the horizontal plane in a naturally flattened state when the length of a circle is cut, and the degree of compressive stress release after the welding wire is processed. The degree of compressive stress release is characterized by the change value of yield strength in the invention according to the research of the present invention.

[0082] The molten metal mentioned in the present invention refers to metal in a pure welding state, and the molten metal properties refer to the mechanical properties of the molten metal, including tensile strength, yield strength, elongation, etc.

[0083] The rod length described in the present invention refers to the length of the welding wire extending out of the wire guide nozzle during welding, which is a common term in the industry.

[0084] The continuous casting and rolling described in the present invention refers to the process in which the molten metal is cast into a cast billet by a casting wheel and then directly passes through a rolling mill connected to the casting machine to be rolled into a round rod with a certain diameter.

[0085] The MPa mentioned in the present invention refers to: the pressure unit megapascal, which is used to characterize the tensile strength or yield strength of a material.

[0086] In order to prove that the welding wire linear stabilization method for manufacturing aluminum-magnesium alloy welding wire and the aluminum-magnesium alloy welding wire prepared by the present invention are advantageous, the following examples are used to demonstrate this.

[0087] Example 1

[0088] The chemical composition of the aluminum-magnesium alloy welding wire of this embodiment is as follows by mass percentage:

[0089] Mg: 4.7%, Mn: 0.75%, Cr: 0.07%, Zr: 0.11%, C: 1ppm, V: 0.016%, Ti: 0.03%, P: 0.002%, Ni: 0.03%, Be: 0.0002%, In: 0.002%, Cu: 0.0055%; the balance is aluminum and impurity elements;

[0090] The mass percentages of impurity elements meet the following requirements: Pb≤0.20wt%, Sb≤0.015wt%, Bi≤0.015wt%, Te≤0.015wt%, S≤0.015wt%, Fe≤0.30wt%, Si≤0.15wt%, Zn≤0.035wt%.

[0091] Among them, Fe: 0.16wt%, Si: 0.07wt%.

[0092] The preparation method of the aluminum-magnesium alloy welding wire in this embodiment is as follows:

[0093] (1) Raw material preparation: 6 tons of alloy were prepared according to the chemical composition requirements using industrial pure aluminum, industrial pure magnesium and intermediate alloys such as Al-Mn, Al-Cr, Al-Ti-C as raw materials.

[0094] (2) Melting and solution treatment: The prepared raw materials are melted at a temperature of 730°C. After the alloy is melted, it is degassed, refined and filtered online to reduce hydrogen, alkali metal elements and impurity particles in the solution. The casting process in the continuous casting and rolling adopts the method of adding chloride salt and chlorine gas for refining.

[0095] (3) Continuous casting + continuous rolling is adopted, the continuous casting temperature is 690°C, the hot rolling temperature is 380°C, and the specification of the aluminum alloy mother rod after rolling is Φ6.2.

[0096] (4) Plastic processing: The mother rod obtained in step (3) is subjected to plastic processing to obtain an aluminum alloy busbar with a specification of Φ2.60.

[0097] (5) Annealing: The busbar obtained in step (4) is subjected to recrystallization annealing at a temperature of 390° C. for 12.0 hours.

[0098] (6) High processing rate plastic processing: The busbar obtained in step (5) is subjected to high processing rate plastic deformation to obtain an aluminum alloy pre-formed billet with a processing rate of 80%.

[0099] (7) Peeling and packaging of aluminum alloy pre-formed billets: The aluminum alloy pre-formed billets obtained in step (6) are peeled, with a peeling thickness of 0.05 mm, and the finished welding wire specification is Φ1.2.

[0100] (8) The final product is subjected to step annealing. The gas pressure of the annealing furnace used for step annealing is controlled at 1 atmosphere. The annealing temperature is 70°C and the holding time is 7 hours. The heating rate is 30°C / hour when the temperature is less than 50°C and 10°C / hour when the temperature is greater than 50°C.

[0101] According to the production process of (1) to (8) above, the output performance requirements meet the aluminum-magnesium alloy welding wire for MIG welding. The characteristics of the final product of Example 1 of the present invention are as follows:

[0102] The diameter of the aluminum-magnesium alloy welding wire is Φ1.2, the spring diameter of the aluminum-magnesium alloy welding wire is Φ650mm, the warping is less than 10mm, and the tensile strength is 470Mpa.

[0103] Example 2

[0104] The chemical composition of the aluminum-magnesium alloy welding wire of this embodiment is as follows by mass percentage:

[0105] Mg: 4.7%, Mn: 0.75%, Cr: 0.07%, Zr: 0.11%, C: 1ppm, V: 0.016%, Ti: 0.03%, P: 0.002%, Ni: 0.03%, Be: 0.0002%, In: 0.002%, Cu: 0.0055%; the balance is aluminum and impurity elements;

[0106] The mass percentage of impurity elements meets the following requirements: Pb≤0.20wt%, Sb≤0.015wt%, Bi≤0.015wt%, Te≤0.015wt%, S≤0.015wt%, Fe≤0.30wt%, Si≤0.15wt%, Zn≤0.035wt%;

[0107] Among them, Fe: 0.16wt%, Si: 0.07wt%.

[0108] The preparation method of the aluminum-magnesium alloy welding wire in this embodiment is as follows:

[0109] (1) Raw material ingredients: Industrial pure aluminum, industrial pure magnesium and intermediate alloys such as Al-Mn, Al-Cr, Al-Ti-C are used as raw materials to prepare 6 tons of alloy according to the chemical composition requirements.

[0110] (2) Melting and solution treatment: The prepared raw materials are melted at a temperature of 730°C. After the alloy is melted, it is degassed, refined and filtered online to reduce hydrogen, alkali metal elements and impurity particles in the solution. The casting process in the continuous casting and rolling adopts the method of adding chloride salt and chlorine gas for refining.

[0111] (3) Continuous casting + continuous rolling is adopted, the continuous casting temperature is 690°C, the hot rolling temperature is 380°C, and the specification of the aluminum alloy mother rod after rolling is Φ6.0.

[0112] (4) Plastic processing: The mother rod obtained in step (3) is subjected to plastic processing to obtain an aluminum alloy busbar with a specification of Φ2.20.

[0113] (5) Annealing: The busbar obtained in step (4) is subjected to recrystallization annealing at a temperature of 390° C. for 12.0 hours.

[0114] (6) High processing rate plastic processing: The busbar obtained in step (5) is subjected to high processing rate plastic deformation to obtain an aluminum alloy pre-formed billet with a processing rate of 75%.

[0115] (7) Peeling and packaging of aluminum alloy pre-formed billets: The aluminum alloy pre-formed billets obtained in step (6) are peeled, with a peeling thickness of 0.06 mm, and the finished welding wire specification is Φ1.0.

[0116] (8) The final product is subjected to step annealing. The gas pressure of the annealing furnace used for step annealing is controlled at 1 atmosphere. The annealing temperature is 70°C and the holding time is 7 hours. The heating rate is 30°C / hour when the temperature is less than 50°C and 10°C / hour when the temperature is greater than 50°C.

[0117] According to the production process of (1) to (8) above, the output performance requirements meet the aluminum-magnesium alloy welding wire for MIG welding. The characteristics of the final product of Example 2 of the present invention are as follows:

[0118] The diameter of the aluminum-magnesium alloy welding wire is Φ1.0, the spring diameter of the aluminum-magnesium alloy welding wire is Φ600mm, the warping is less than 10mm, and the tensile strength is 485Mpa.

[0119] Example 3

[0120] The chemical composition of the aluminum-magnesium alloy welding wire of this embodiment is as follows by mass percentage:

[0121] Mg: 4.85%, Mn: 0.85%, Cr: 0.07%, Zr: 0.11%, C: 1ppm, V: 0.016%, Ti: 0.03%, P: 0.002%, Ni: 0.03%, Be: 0.0002%, In: 0.002%, Cu: 0.0055%; the balance is aluminum and impurity elements;

[0122] The mass percentage of impurity elements meets the following requirements: Pb≤0.20wt%, Sb≤0.015wt%, Bi≤0.015wt%, Te≤0.015wt%, S≤0.015wt%, Fe≤0.30wt%, Si≤0.15wt%, Zn≤0.035wt%;

[0123] Among them, Fe: 0.19wt%, Si: 0.07wt%.

[0124] The preparation method of the aluminum-magnesium alloy welding wire in this embodiment is as follows:

[0125] (1) Raw material preparation: 6 tons of alloy were prepared according to the chemical composition requirements using industrial pure aluminum, industrial pure magnesium and intermediate alloys such as Al-Mn, Al-Cr, Al-Ti-C as raw materials.

[0126] (2) Melting and solution treatment: The prepared raw materials are melted at a temperature of 730°C. After the alloy is melted, it is degassed, refined and filtered online to reduce hydrogen, alkali metal elements and impurity particles in the solution. The casting process in the continuous casting and rolling adopts the method of adding chloride salt and chlorine gas for refining.

[0127] (3) Continuous casting + continuous rolling is adopted, the continuous casting temperature is 690°C, the hot rolling temperature is 380°C, and the specification of the aluminum alloy mother rod after rolling is Φ6.2.

[0128] (4) Plastic processing: The mother rod obtained in step (3) is subjected to plastic processing to obtain an aluminum alloy busbar with a specification of Φ3.40.

[0129] (5) Annealing: The busbar obtained in step (4) is subjected to recrystallization annealing at a temperature of 390° C. for 12.0 hours.

[0130] (6) High processing rate plastic processing: The busbar obtained in step (5) is subjected to high processing rate plastic deformation to obtain an aluminum alloy pre-formed billet with a processing rate of 66%.

[0131] (7) Peeling and packaging of aluminum alloy pre-formed billets: The aluminum alloy pre-formed billets obtained in step (6) are peeled, with a peeling thickness of 0.10 mm, and the finished welding wire specification is Φ2.0.

[0132] (8) The final product is subjected to step annealing. The gas pressure of the annealing furnace used for step annealing is controlled at 1 atmosphere. The annealing temperature is 80°C and the holding time is 9.5 hours. The heating rate is 30°C / hour when the temperature is less than 50°C and 10°C / hour when the temperature is greater than 50°C.

[0133] According to the production process of (1) to (8) above, the output performance requirements meet the aluminum-magnesium alloy welding wire for MIG welding. The characteristics of the final product of Example 3 of the present invention are as follows:

[0134] The diameter of the aluminum-magnesium alloy welding wire is Φ2.0, the spring diameter of the aluminum-magnesium alloy welding wire is Φ600mm, the warping is less than 10mm, and the tensile strength is 465Mpa.

[0135] Example 4

[0136] The chemical composition of the aluminum-magnesium alloy welding wire of this embodiment is as follows by mass percentage:

[0137] Mg: 4.90%, Mn: 0.95%, Cr: 0.07%, Zr: 0.11%, C: 1ppm, V: 0.016%, Ti: 0.07%, P: 0.008%, Ni: 0.04%, Be: 0.0002%, In: 0.002%, Cu: 0.0045%: the balance is aluminum and impurity elements;

[0138] The mass percentage of impurity elements meets the following requirements: Pb≤0.20wt%, Sb≤0.015wt%, Bi≤0.015wt%, Te≤0.015wt%, S≤0.015wt%, Fe≤0.30wt%, Si≤0.15wt%, Zn≤0.035wt%;

[0139] Among them, Fe: 0.14wt%, Si: 0.06wt%.

[0140] The preparation method of the aluminum-magnesium alloy welding wire in this embodiment is as follows:

[0141] (1) Raw material preparation: 5.5 tons of alloy were prepared according to the chemical composition requirements using industrial pure aluminum, industrial pure magnesium and intermediate alloys such as Al-Mn, Al-Cr, Al-Ti-C as raw materials.

[0142] (2) Melting and solution treatment: The prepared raw materials are melted at a temperature of 750°C. After the alloy is melted, it is degassed, refined and filtered online to reduce hydrogen, alkali metal elements and impurity particles in the solution. The casting process in the continuous casting and rolling adopts the method of adding chloride salt and chlorine gas for refining.

[0143] (3) Continuous casting + continuous rolling + micro rolling is adopted, the continuous casting temperature is 720°C, the hot rolling temperature is 395°C, and the specification of the aluminum alloy mother rod after rolling is Φ6.5.

[0144] (4) Plastic processing: The mother rod obtained in step (3) is subjected to plastic processing to obtain an aluminum alloy busbar with a specification of Φ3.15.

[0145] (5) Annealing: The busbar obtained in step (4) is subjected to recrystallization annealing at a temperature of 380° C. for 12.0 hours.

[0146] (6) Plastic deformation with a high processing rate: The busbar obtained in step (5) is subjected to plastic deformation with a high processing rate to obtain an aluminum alloy pre-formed billet with a processing rate of 68%.

[0147] (7) Peeling and packaging of aluminum alloy pre-formed billets: The aluminum alloy pre-formed billets obtained in step (6) are peeled, with a peeling thickness of 0.06 mm, and the finished welding wire specification is Φ1.6.

[0148] (8) The final product is subjected to step annealing. The gas pressure of the annealing furnace used for step annealing is controlled at 1 atmosphere. The annealing temperature is 65°C and the holding time is 6.5 hours. The heating rate is 30°C / hour when the temperature is less than 50°C and 15°C / hour when the temperature is greater than 50°C.

[0149] According to the production process of (1) to (8) above, the output performance requirements meet the aluminum-magnesium alloy welding wire for MIG welding. The characteristics of the final product of Example 4 of the present invention are as follows:

[0150] The diameter of the aluminum-magnesium alloy welding wire is Φ1.6, the spring diameter of the aluminum-magnesium alloy welding wire is Φ550mm, the warping is less than 10mm, and the tensile strength is 470Mpa.

[0151] Example 5

[0152] The chemical composition of the aluminum-magnesium alloy welding wire of this embodiment is as follows by mass percentage:

[0153] Mg: 5.0%, Mn: 1.0%, Cr: 0.12%, Zr: 0.12%, C: 4ppm, V: 0.017%, Ti: 0.10%, P: 0.005%, Ni: 0.03%, Be: 0.0001%, In: 0.0015%, Cu: 0.0050%; the balance is aluminum and impurity elements;

[0154] The mass percentage of impurity elements meets the following requirements: Pb≤0.20wt%, Sb≤0.015wt%, Bi≤0.015wt%, Te≤0.015wt%, S≤0.015wt%, Fe≤0.30wt%, Si≤0.15wt%, Zn≤0.035wt%;

[0155] Among them, Fe: 0.25wt%, Si: 0.09wt%.

[0156] The preparation method of the aluminum-magnesium alloy welding wire in this embodiment is as follows:

[0157] (1) Raw material preparation: 6.5 tons of alloy were prepared according to the chemical composition requirements using industrial pure aluminum, industrial pure magnesium and master alloys such as Al-Mn, Al-Cr, Al-Ti-C as raw materials.

[0158] (2) Melting and solution treatment: The prepared raw materials are melted at a temperature of 730°C. After the alloy is melted, it is degassed, refined and filtered online to reduce hydrogen, alkali metal elements and impurity particles in the solution. The casting process in the continuous casting and rolling adopts the method of adding chloride salt and chlorine gas for refining.

[0159] (3) Continuous casting + continuous rolling is adopted, the continuous casting temperature is 690°C, the hot rolling temperature is 380°C, and the specification of the aluminum alloy mother rod after rolling is Φ6.2.

[0160] (4) Plastic processing: The mother rod obtained in step (3) is subjected to plastic processing to obtain an aluminum alloy busbar with a specification of Φ2.20.

[0161] (5) Annealing: The busbar obtained in step (4) is subjected to recrystallization annealing at a temperature of 390° C. for 12.0 hours.

[0162] (6) High processing rate plastic processing: The busbar obtained in step (5) is subjected to high processing rate plastic deformation to obtain an aluminum alloy pre-formed billet with a processing rate of 73%.

[0163] (7) Peeling and packaging of aluminum alloy pre-formed billets: The aluminum alloy pre-formed billets obtained in step (6) are peeled, with a peeling thickness of 0.06 mm and a finished welding wire specification of Φ1.1.

[0164] (8) The final product is subjected to step annealing. The gas pressure of the annealing furnace used for step annealing is controlled at 1 atmosphere. The annealing temperature is 70°C and the holding time is 7 hours. The heating rate is 30°C / hour when the temperature is less than 50°C and 10°C / hour when the temperature is greater than 50°C.

[0165] According to the production process of (1) to (8) above, the output performance requirements meet the aluminum-magnesium alloy welding wire for MIG welding. The characteristics of the final product of Example 5 of the present invention are as follows:

[0166] The diameter of the aluminum-magnesium alloy welding wire is Φ1.1, the spring diameter of the aluminum-magnesium alloy welding wire is Φ580, the warp is 8mm, and the tensile strength is 470Mpa.

[0167] Example 6

[0168] The chemical composition of the aluminum-magnesium alloy welding wire of this embodiment is as follows by mass percentage:

[0169] Mg: 5.2%, Mn: 0.75%, Cr: 0.18%, Zr: 0.13%, C: 2ppm, V: 0.025%, Ti: 0.08%, P: 0.007%, Ni: 0.04%, Be: 0.0003%, In: 0.0009%, Cu: 0.0055%; the balance is aluminum and impurity elements;

[0170] The mass percentage of impurity elements meets the following requirements: Pb≤0.20wt%, Sb≤0.015wt%, Bi≤0.015wt%, Te≤0.015wt%, S≤0.015wt%, Fe≤0.30wt%, Si≤0.15wt%, Zn≤0.035wt%;

[0171] Among them, Fe: 0.21wt%, Si: 0.08wt%.

[0172] The preparation method of the aluminum-magnesium alloy welding wire in this embodiment is as follows:

[0173] (1) Raw material preparation: 6 tons of alloys were prepared according to the chemical composition requirements using industrial pure aluminum, industrial pure magnesium and master alloys such as Al-Mn, Al-Cr, Al-Ti-C as raw materials;

[0174] (2) Melting and solution treatment: The prepared raw materials are melted at a temperature of 730° C. After the alloy is melted, it is degassed, refined and filtered online to reduce hydrogen, alkali metal elements and impurity particles in the solution. The casting process in the continuous casting and rolling adopts the method of adding chloride salt and chlorine gas for refining;

[0175] (3) Continuous casting + continuous rolling is adopted, the continuous casting temperature is 690°C, the hot rolling temperature is 380°C, and the specification of the aluminum alloy mother rod after rolling is Φ6.2.

[0176] (4) Plastic processing: Plastic processing is performed on the mother bar obtained in step (3) to obtain an aluminum alloy busbar with a specification of Φ2.55;

[0177] (5) Annealing: The busbar obtained in step (4) is subjected to recrystallization annealing at a temperature of 390° C. for 12.0 hours;

[0178] (6) High processing rate plastic processing: The busbar obtained in step (5) is subjected to high processing rate plastic deformation to obtain an aluminum alloy pre-formed billet with a processing rate of 77.8%.

[0179] (7) Peeling and packaging of aluminum alloy pre-formed billets: The aluminum alloy pre-formed billets obtained in step (6) are peeled, with a peeling thickness of 0.05 mm, and the finished welding wire specification is Φ1.2.

[0180] (8) The final product is subjected to step annealing. The gas pressure of the annealing furnace used for step annealing is controlled at 1 atmosphere. The annealing temperature is 80°C and the holding time is 7 hours. The heating rate is 30°C / hour when the temperature is less than 50°C and 10°C / hour when the temperature is greater than 50°C.

[0181] According to the production process of (1) to (8) above, the output performance requirements meet the aluminum-magnesium alloy welding wire for MIG welding. The characteristics of the final product of Example 6 of the present invention are as follows:

[0182] The diameter of the aluminum-magnesium alloy welding wire is Φ1.2, the spring diameter of the aluminum-magnesium alloy welding wire is Φ580, the warping is 8mm, and the tensile strength is 465Mpa.

[0183] The components and contents of the aluminum-magnesium alloy welding wires of Comparative Examples 1 to 6 are shown in Table 1, respectively. The preparation methods of the aluminum-magnesium alloy welding wires of Comparative Examples 1 to 6 are the same as those of Example 1.

[0184] The components and contents of the aluminum-magnesium alloy welding wires of Examples 7, 8 and 9 are the same as those of Example 1. The low-temperature step annealing systems of the aluminum-magnesium alloy welding wires of Examples 7, 8 and 9 are shown in Table 2.

[0185] The components and contents of the aluminum-magnesium alloy welding wires of Comparative Examples 7 to 13 are the same as those of Example 1. The low-temperature step annealing systems of the aluminum-magnesium alloy welding wires of Comparative Examples 7 to 13 are shown in Table 2.

[0186] Table 1 Comparative Examples 1 to 6 Aluminum-Magnesium Alloy Welding Wire Composition

[0187]

[0188] Table 2 Step annealing system, performance and weld performance of aluminum-magnesium alloy welding wire of Example 79 and Comparative Example 713

[0189]

[0190] Combined with Table 1, comparative analysis: because the ratio of Fe to Si in Comparative Examples 1 and 2 is not within the range of 2 to 3:1, the elongation of the welding wire and the weld will be reduced, and the elongation of the weld metal obtained by the test is only 15%, which cannot meet the welding requirements; the material in Comparative Example 3 does not contain C, and the continuous casting and rolling process cannot be formed, and mass production cannot be carried out; in Comparative Example 4, because of the excessive addition of V and Ti refining metal elements, the plasticity of the material is reduced, and the plasticity (elongation) of the weld is also reduced. The elongation of the weld metal obtained by the test is only 12%, which cannot meet the welding requirements; the Cu content of Comparative Example 5 is too high, exceeding the limit of the present invention, and continuous casting and rolling cannot be formed; in Comparative Example 6, because of the excessive addition of Zr element, the cooling rate of the solution is fast during continuous casting and rolling, the material cannot be formed, and normal production cannot be carried out.

[0191] Combined with Table 2 for comparative analysis: For Example 7, because no low-temperature annealing treatment was performed, the warp and coil diameter of the welding wire did not meet the requirements, and the welding processability was poor; for Examples 8 to 9, because the annealing holding time did not meet the requirements of the present invention, the tensile strength of the welding wire of Example 8 did not meet the requirements of the welding wire, and the warp of Example 9 did not meet the requirements of the welding wire; for Examples 10 to 11, because the low-temperature annealing process was too low or too high, the performance of the welding wire did not meet the processability requirements of MIG welding for the welding wire; for Example 12, because the heating rate was too low, the strength of the welding wire tended to soften, and the requirements of welding processability could not be met; for Example 13, because the heating rate was too fast, the stress could not be completely released, the warp exceeded the standard, and the requirements of the patent of the present invention could not be met, and the wire feeding requirements of welding processability could not be met.

[0192] Table 3 is a comparison of the melting properties of the welding wire of the embodiment of the present invention and the comparative welding wire. The comparative welding wire brand is ER5087 commonly used in the market, and the welding base material 5083 is used.

[0193] Table 3 Performance comparison between welding wires of the present invention and comparative welding wires

[0194]

[0195]

[0196] It can be seen from the above embodiments that a high-performance aluminum-magnesium alloy welding wire can be obtained through the present invention, and its melting strength is about 10Mpa higher than that of ordinary ER5087 welding wire. At the same time, the plasticity of the weld is not reduced. After continuous casting and rolling, a mother rod with a package weight of up to 2 tons can be obtained, which avoids the welding problems and production efficiency problems of the extrusion process. At the same time, the specifications are smaller, and compared with the existing continuous casting and rolling processes, the corresponding production cost and equipment cost are lower.

[0197] In addition, the organizational diagram of the product prepared by the present invention is as follows Figure 1 As shown: 1: α-Al; 2: Mg2Si; 3: Al2Zr3; 4: (Fe, Mn, Cr)Alx; 5: Mg3Al2; 6: Ti2C, showing the distribution and position of the main elements in the product structure prepared by the present invention.

[0198] At the same time, because the present invention adopts a low-temperature step annealing process system for the final product, the indicators affecting the wire feedability such as the spring-opening diameter, warping and yield strength of the welding wire are more stable, thereby improving the welding forming performance and welding processability.

[0199] The various aspects, embodiments, and features of the present invention should be considered to be illustrative in all aspects and not limiting of the present invention, the scope of which is defined solely by the claims. Other embodiments, modifications, and uses will be apparent to those skilled in the art without departing from the spirit and scope of the claimed invention.

[0200] In the preparation method of the present invention, the order of each step is not limited to the order listed. For those skilled in the art, without creative work, the order of each step is also within the protection scope of the present invention. In addition, two or more steps or actions can be performed simultaneously.

[0201] Finally, it should be noted that the specific embodiments described herein are merely examples of the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art of the present invention may make various modifications or additions to the specific embodiments described, or replace them in a similar manner. It is not necessary and impossible to provide all examples of all implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the scope of protection of the present invention, and interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A welding wire linear stabilization method for manufacturing aluminum-magnesium alloy welding wire, characterized in that: The welding wire linear stabilization method comprises the following steps: performing step annealing on the finished aluminum-magnesium alloy welding wire, the annealing temperature is 50-135° C., and keeping the temperature at the annealing temperature for 3-24 hours; the finished aluminum-magnesium alloy welding wire has a specification of 0.8-2.0 mm; During the step annealing process, the heating rate is 25~35℃ / hour when the temperature is less than 50℃, and the heating rate is 5~15℃ / hour when the temperature is greater than 50℃; The finished aluminum-magnesium alloy welding wire includes the following weight percentage components: magnesium: 4.5~5.2wt%; manganese: 0.75~1.10wt%; chromium: 0.05~0.20wt%; zirconium: 0.10~0.15wt%; carbon: 0.0001~0.0050wt%; one or more of Li, Na, K, Ca, Rb, Cs, any one of which has a content of less than 0.001wt%, trace elements W1 and trace elements W2; the balance is aluminum and unavoidable impurity elements; The trace element W1 is two or more of P, La, Ba, V, Ga, and Ti; the trace element W2 is two or more of Cu, Be, Nb, Ag, In, and Ni; the weight percentage of the trace element W1 is 0.03-0.25wt%, the weight percentage of the trace element W2 is 0.01-0.20wt%, and the content of inevitable impurity elements is less than 0.50wt%; The impurity elements include the following weight percentage elements: Pb≤0.20wt%, Sb≤0.015wt%, Bi≤0.015wt%, Te≤0.015wt%, S≤0.015wt%, Fe≤0.30wt%, Si≤0.15wt%, Zn≤0.035wt%; the mass ratio of Fe to Si is (2~3):

1.

2. The welding wire linear stabilization method according to claim 1, characterized in that: The finished aluminum-magnesium alloy welding wire is prepared by a method comprising the following steps: smelting, continuous casting and rolling to obtain an aluminum-magnesium alloy welding wire mother rod, plastic processing of the mother rod, annealing, plastic deformation, peeling, and packaging; the specifications of the aluminum-magnesium alloy welding wire mother rod manufactured by continuous casting and rolling are Ф3.5~Ф7.5mm.

3. An aluminum-magnesium alloy welding wire, characterized in that: The welding wire is prepared by the welding wire linear stabilization method described in claim 1.

4. The aluminum-magnesium alloy welding wire according to claim 3, characterized in that: The diameter of aluminum-magnesium alloy welding wire is Ф0.8~Ф2.0mm, the spring-opening diameter of aluminum-magnesium alloy welding wire is Ф350~Ф800mm, and the warping is <10mm.

5. The aluminum-magnesium alloy welding wire according to claim 3, characterized in that: The diameter of the aluminum-magnesium alloy welding wire is Ф0.8~Ф2.0mm, the tensile strength is 440~520Mpa, and the weld strength after cladding is not less than 0.63 times the strength of the welding wire.

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