Method for producing 5356 aluminum alloy welding material through continuous casting and rolling process

Abstract

The invention provides a method for producing a 5356 aluminum alloy welding material through a continuous casting and rolling technology, and relates to the technical field of aluminum alloy wire preparation. S2, on-line treatment of the melt; s3, continuous casting of molten aluminum; s4, milling the surface of the casting blank; s5, the casting blank is reheated; s6, casting blank rough rolling; and S7, the casting blank is subjected to finish rolling, and the 5356 aluminum alloy welding material is obtained. And S8, quenching and homogenizing treatment are carried out. The 5356 aluminum alloy welding material produced through the method is smooth in surface, free of burrs, cracks and burrs and stable in mechanical property, the weight of a single finished product coil is 1900-2200 kg, the length of a rod wire is larger than 3000 m, efficient continuous production of an extrusion and drawing machine can be achieved, the yield is high, and the production cost is low.

Description

Technical Field

[0001] This application relates to the field of aluminum alloy wire processing technology, and in particular to a method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process. Background Technology

[0002] 5356 aluminum alloy is a commonly used aluminum-magnesium alloy welding material. It has high strength, good ductility, strong corrosion resistance, good resistance to hot cracking, and good welding process performance. It has significant application prospects in transportation, pressure vessels, new energy vehicles, and aerospace.

[0003] During the research on 5356 aluminum alloy, the applicant found that the relevant technology has at least the following problems: (1) The domestic production of 5356 aluminum alloy welding materials mainly adopts semi-continuous direct water-cooled casting (DC Casting) to form bars, which are then continuously extruded into welding material raw materials that meet the specifications for welding wire preparation. Downstream manufacturers need to be equipped with large extrusion presses, which requires high skill levels from operators; (2) The welding material production process in the extrusion process is complex, the process is long, the efficiency is low, the product quality stability is poor, which leads to increased production costs. Summary of the Invention

[0004] In view of this, this application provides a method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process. The main purpose is to solve the problems of complex production processes, long workflows, low efficiency, and poor product quality stability during the extrusion process, which leads to increased production costs. The method described in this application produces 5356 aluminum alloy welding materials with good surface quality, high geometric precision (diameter within ±0.3mm), tensile strength fluctuation within 15MPa, good elongation with fluctuation less than 10%, stable product quality, and high production efficiency. Downstream customers can achieve continuous extrusion and drawing production of 1900-2200kg in a single operation, resulting in high yield, high production efficiency, and low production costs.

[0005] To achieve the above objectives, this application provides a method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process, the method comprising the following steps: S1. Aluminum molten metal smelting: Aluminum molten metal is loaded into a smelting furnace, 20-40% solid cold material is added, the smelting temperature is 740-760℃, intermediate alloy is added according to the batching to alloy the aluminum molten metal, under argon conditions, the melt is refined by spraying powder with refining agent for 10-20 minutes, and after refining, the dross on the surface of the aluminum molten metal is removed. S2. Online melt treatment: The melt is purified online using a degassing device, and then further purified by a PTF tubular filter; a refining agent is added online, and ultrasonic treatment is introduced to refine the melt, followed by a CFF plate filter. S3. Continuous casting of aluminum liquid: The transfer casting melt is introduced into the intermediate ladle using a first-level laser automatic control device. The melt in the intermediate ladle is introduced into the small ladle through a second-level balance automatic flow control. The crystallization cavity is formed by the crystallizing wheel and a special steel strip, and the casting is carried out by constant pressure, constant flow and constant temperature water cooling. S4. Milling the surface of the cast billet: Performing online milling on the surface of the cast billet; S5. Reheating of the billet: The billet is heated online automatically at a constant temperature to obtain the billet to be rolled. S6. Slab rough rolling: Two-roll, two-pass rolling is used to ensure that the cross-sectional area of ​​the slab entering the rolling mill is reduced by more than 30% to obtain the rough rolled slab. S7. Finishing rolling of cast billet: The rough-rolled billet is continuously rolled by three rollers in 6 passes to obtain 5356 aluminum alloy welding material. S8. Quenching and homogenization treatment: The 5356 aluminum alloy welding material is quenched online by atomization, automatically wound, and then homogenized.

[0006] In some embodiments, in step S1, the aluminum liquid alloying process involves first adding aluminum-manganese alloy and aluminum-chromium alloy, stirring for ≥10 min, and then adding metallic magnesium and aluminum-titanium alloy, so that the composition of the melt is Si: ≤0.1wt%, Fe≤0.12wt%, Mg: 4.8-5.1wt%, Mn: 0.1-0.16wt%, Cr: 0.1-0.14wt%, Ti: 0.08-0.12wt%, Na+Li<0.0003wt%, and other single elements ≤0.05wt%.

[0007] In some embodiments, in step S1, the aluminum liquid is first refined when the temperature reaches 740-760℃; after slag removal, aluminum-manganese and aluminum-chromium alloys are added for a second refinement; after slag removal, metallic magnesium and aluminum-titanium alloys are added for a third refinement.

[0008] In some embodiments, in step S2, the degassing device uses a degassing medium to perform online purification of the melt through a rotor.

[0009] In some embodiments, in step S3, the surface fluctuation of the molten metal in the small ladle casting is 0-0.5 mm; the speed of the constant pressure, constant flow, and constant temperature water-cooled casting is 1.2-1.25 t / h.

[0010] In some embodiments, in step S3, the crystallizing wheel is a Ф1100mm three-sided copper trapezoidal small-section hollow crystallizing wheel.

[0011] In some embodiments, in step S4, the thickness of the online milled surface is 0.2-0.5 mm.

[0012] In some embodiments, in step S5, the automatic constant temperature heating process is carried out in a medium frequency induction furnace, and the temperature of the billet entering the rolling mill is 350-410°C.

[0013] In some embodiments, in step S8, the 5356 aluminum alloy welding material is automatically wound using a dual-disc fully automatic switching coiler, and the length of the finished coil of the aluminum alloy welding material is ≥3000m.

[0014] In some embodiments, the 5356 aluminum alloy welding material has a size of φ8mm.

[0015] Compared with the prior art, the method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process described in this application has the following advantages: (1) This application uses continuous casting and rolling process to produce 5356 aluminum alloy welding material, which has a smooth surface without burrs, cracks, oxide scale, and stable mechanical properties; (2) The continuous casting and rolling process used in this application produces 5356 aluminum alloy welding materials with high production efficiency, low energy consumption, high yield, and a continuous length of over 3000 meters (per roll). Attached Figure Description

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This paper illustrates a flowchart of a method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process, as provided in an embodiment of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0020] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0021] One embodiment of this application provides a method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process, such as... Figure 1 As shown, the method includes the following steps: S1. Aluminum Molten Metal Melting: Molten aluminum is poured into a melting furnace, and 20-40% solid cold material is added. The melting temperature is 740-760℃. An intermediate alloy is added according to the batching to alloy the molten aluminum. Under argon atmosphere, a refining agent is used to spray and refine the melt for 10-20 minutes. After refining, the surface dross of the molten aluminum is removed. Specifically, the intermediate alloy includes 20% aluminum-manganese alloy, 20% aluminum-chromium alloy, 10% aluminum-titanium alloy, and 99.9% metallic magnesium. Further, the 20% aluminum-manganese alloy is an alloy formed by adding manganese to aluminum, with aluminum accounting for 80% and manganese for 20%; similarly, the 20% aluminum-chromium alloy is an alloy formed by adding chromium to aluminum, with aluminum accounting for 80% and chromium for 20%; the 10% aluminum-titanium alloy is an alloy formed by adding titanium to aluminum, with aluminum accounting for 90% and titanium for 10%. The composition of the melt obtained by alloying aluminum liquid is as follows: Si: ≤0.1wt%, Fe: ≤0.12wt%, Mg: 4.8-5.1wt%, Mn: 0.1-0.16wt%, Cr: 0.1-0.14wt%, Ti: 0.08-0.12wt%, Na+Li<0.0003wt%, and other single elements ≤0.05%. The above refining agent is a sodium-free granular refining agent.

[0022] S2. Online Melt Processing: The melt is purified online using a degassing device, followed by further purification via PTF tubular filtration. A grain refiner is added online, and ultrasonic treatment is introduced to refine the melt, which is then filtered using a CFF plate filter. The degassing device can be a dual-chamber, dual-rotor degassing device with superior high-temperature resistance, using argon and dichloroethane as the degassing medium to achieve a hydrogen content of less than 0.12 mg / 100 ml. The aforementioned grain refiner is an AlTi5B1 aluminum titanium boron wire grain refiner, which promotes grain refinement and optimizes phase transformation microstructure. CFF plate filtration effectively eliminates secondary gas absorption and oxide inclusions caused by the addition of the grain refiner.

[0023] S3. Continuous Casting of Aluminum Liquid: The molten aluminum is introduced into the intermediate ladle using a primary laser automatic control device. The molten aluminum in the intermediate ladle is then introduced into the small ladle via a secondary balance for automatic flow control. A crystallization cavity is formed by the crystallizing wheel and a special steel strip, followed by constant pressure, constant flow, and constant temperature water cooling casting. Specifically, during the process of introducing the molten aluminum from the intermediate ladle into the small ladle via the secondary balance for automatic flow control, the molten aluminum level in the small ladle is maintained within 0-0.5mm fluctuation. The cavity crystallizing wheel is a Ф1100mm three-sided copper trapezoidal small-section cavity crystallizing wheel, and the special steel strip is a 2.0mm thick special steel strip, forming a 645mm cross-section. 2 The crystallization chamber is subjected to constant pressure, constant flow and constant temperature water cooling casting on 4 sides and 6 zones, with a casting speed of 1.2-1.25t / h.

[0024] S4. Milling the surface of the cast billet: Milling the surface of the cast billet online; specifically, the thickness of the milled surface is 0.2-0.5mm. Online milling is used to remove the oxide film and some oxide impurities from the surface of the cast billet.

[0025] S5. Reheating of the billet: The billet is subjected to online automatic constant temperature heating to obtain the billet to be rolled. The online automatic constant temperature heating of the billet is carried out in a medium frequency induction furnace, and the temperature of the billet to be rolled is 350-410℃.

[0026] S6. Slab rough rolling: Two-roll, two-pass rolling is used to ensure that the cross-sectional area of ​​the slab entering the rolling mill is reduced by more than 30% to obtain the rough rolled slab. S7. Cast billet finishing: The rough-rolled billet is continuously rolled by three rollers in 6 passes to obtain 5356 aluminum alloy welding material; the size of the above 5356 aluminum alloy welding material is φ8mm, and the out-of-roundness deviation of the wire rod is ±0.3mm.

[0027] S8. Quenching and Homogenization Treatment: The 5356 aluminum alloy welding material undergoes online atomization quenching, automatic winding, and then homogenization treatment. Furthermore, after online atomization quenching, the temperature of the 5356 aluminum alloy welding material is below 60℃. A close-packed automatic winding machine with dual-disc fully automatic switching is used for the automatic winding of the 5356 aluminum alloy welding material. Each roll of 5356 aluminum alloy welding material consists of 1900-2200 kg of close-packed layers, with a length of over 3000 m, maximizing the efficiency of downstream continuous extrusion production. The homogenization treatment of the 5356 aluminum alloy welding material is used to eliminate component segregation, optimize the microstructure, and improve processing performance.

[0028] Example 1 S1, Aluminum Molten Metal Melting Aluminum liquid with an aluminum content ≥99.70% is loaded into a melting furnace, and 30% solid cold material is added. The melting temperature is controlled at 745℃ for the first refining. After slag removal, 20% aluminum-manganese alloy and 20% aluminum-chromium alloy are added to the furnace according to the batching for the second refining. After slag removal, 10% aluminum-titanium alloy and 99.9% metallic magnesium are added for the third refining. Under argon conditions, sodium-free granular refining agent is used to spray the melt for 15 minutes.

[0029] S2, Online Melt Processing The online degassing of molten aluminum employs a dual-chamber, dual-rotor degassing device with an ultra-high temperature-resistant silicon nitride rotor. Argon and dichloroethane are used as degassing media to purify the melt online through the rotor, reducing the hydrogen content to less than 0.12 mg / 100 ml. After degassing, the melt is further purified by PTF tubular filtration. AlTi5B1 aluminum titanium boron wire refiner is added online to the high-purity melt, and ultrasonic treatment is introduced to enhance the refinement effect. The refined melt is then filtered again using CFF plate filtration to eliminate secondary gas absorption and oxide inclusions caused by the addition of the refiner.

[0030] S3, Continuous casting of molten aluminum The molten metal is introduced into the intermediate ladle using a primary laser automatic control device. The molten metal from the intermediate ladle is then automatically introduced into the small ladle via a secondary balance, maintaining the molten metal level fluctuation in the small ladle within 0-0.5mm. It is then encased by a Ф1100mm three-sided copper trapezoidal small-section hollow crystallizing wheel and a 2.0mm thick special steel strip, forming a 645mm cross-section. 2 The crystallization chamber is subjected to constant pressure, constant flow and constant temperature water cooling casting on 4 sides and 6 zones, with a casting speed of 1.2t / h.

[0031] S4, rough rolling of cast billet It adopts a two-roll, two-pass rolling process.

[0032] S5, Precision rolling of cast billet The roughing billet is continuously rolled in 6 passes using three rollers to obtain 5356 aluminum alloy welding material, the size of which is φ8mm.

[0033] S6. Quenching and Homogenization Treatment 5356 aluminum alloy welding material undergoes online atomization quenching, automatic winding, and then homogenization treatment.

[0034] Example 2 S1, Aluminum Molten Metal Melting Aluminum liquid with an aluminum content ≥99.70% is loaded into a melting furnace, and 30% solid cold material is added. The melting temperature is controlled at 745℃ for the first refining. After slag removal, 20% aluminum-manganese alloy and 20% aluminum-chromium alloy are added to the furnace according to the batching for the second refining. After slag removal, 10% aluminum-titanium alloy and 99.9% metallic magnesium are added for the third refining. Under argon conditions, sodium-free granular refining agent is used to spray the melt for 15 minutes.

[0035] S2, Online Melt Processing The online degassing of molten aluminum employs a dual-chamber, dual-rotor degassing device with an ultra-high temperature-resistant silicon nitride rotor. Argon and dichloroethane are used as degassing media to purify the melt online through the rotor, reducing the hydrogen content to less than 0.12 mg / 100 ml. After degassing, the melt is further purified by PTF tubular filtration. AlTi5B1 aluminum titanium boron wire refiner is added online to the high-purity melt, and ultrasonic treatment is introduced to enhance the refinement effect. The refined melt is then filtered again using CFF plate filtration to eliminate secondary gas absorption and oxide inclusions caused by the addition of the refiner.

[0036] S3, Continuous casting of molten aluminum The molten metal is introduced into the intermediate ladle using a primary laser automatic control device. The molten metal from the intermediate ladle is then automatically introduced into the small ladle via a secondary balance, maintaining the molten metal level fluctuation in the small ladle within 0-0.5mm. It is then encased by a Ф1100mm three-sided copper trapezoidal small-section hollow crystallizing wheel and a 2.0mm thick special steel strip, forming a 645mm cross-section. 2 The crystallization chamber is subjected to constant pressure, constant flow and constant temperature water cooling casting on 4 sides and 6 zones, with a casting speed of 1.2t / h.

[0037] S4. Reheating of the billet The billet is reheated using a medium-frequency induction furnace to ensure that the billet reaches a temperature of 410℃ after heating.

[0038] S5, rough rolling of cast billet It adopts a two-roll, two-pass rolling process.

[0039] S6, Precision rolling of cast billet The roughing billet is continuously rolled in 6 passes using three rollers to obtain 5356 aluminum alloy welding material, the size of which is φ8mm.

[0040] S7. Quenching and Homogenization Treatment 5356 aluminum alloy welding material undergoes online atomization quenching, automatic winding, and then homogenization treatment.

[0041] Example 3 S1, Aluminum Molten Metal Melting Aluminum liquid with an aluminum content ≥99.70% is charged into a melting furnace, and 30% solid cold material is added. The melting temperature is controlled at 745℃ for the first refining. After slag removal, 20% aluminum-manganese alloy and 20% aluminum-chromium alloy are added to the furnace according to the batching for the second refining. After slag removal, 10% aluminum-titanium alloy and 99.9% metallic magnesium are added. The third refining is carried out under argon conditions, and sodium-free granular refining agent is used to spray the melt for refining for 15 minutes.

[0042] S2, Online Melt Processing The online degassing of molten aluminum employs a dual-chamber, dual-rotor degassing device with an ultra-high temperature-resistant silicon nitride rotor. Argon and dichloroethane are used as degassing media to purify the melt online through the rotor, reducing the hydrogen content to less than 0.12 mg / 100 ml. After degassing, the melt is further purified by PTF tubular filtration. AlTi5B1 aluminum titanium boron wire refiner is added online to the high-purity melt, and ultrasonic treatment is introduced to enhance the refinement effect. The refined melt is then filtered again using CFF plate filtration to eliminate secondary gas absorption and oxide inclusions caused by the addition of the refiner.

[0043] S3, Continuous casting of molten aluminum The molten metal is introduced into the intermediate ladle using a primary laser automatic control device. The molten metal from the intermediate ladle is then automatically introduced into the small ladle via a secondary balance, maintaining the molten metal level fluctuation in the small ladle within 0-0.5mm. It is then encased by a Ф1100mm three-sided copper trapezoidal small-section hollow crystallizing wheel and a 2.0mm thick special steel strip, forming a 645mm cross-section. 2 The crystallization chamber is subjected to constant pressure, constant flow and constant temperature water cooling casting on 4 sides and 6 zones, with a casting speed of 1.2t / h.

[0044] S4, Milling the surface of the cast billet The surface of the cast billet is milled online to a thickness of 0.2-0.5 mm.

[0045] S5. Reheating of the billet The billet is reheated using a medium-frequency induction furnace to ensure that the billet reaches a temperature of 410℃ after heating.

[0046] S6, rough rolling of cast billet It adopts a two-roll, two-pass rolling process.

[0047] S7, Precision rolling of cast billet The roughing billet is continuously rolled in 6 passes using three rollers to obtain 5356 aluminum alloy welding material, the size of which is φ8mm.

[0048] S8, Quenching and Homogenization Treatment 5356 aluminum alloy welding material undergoes online atomization quenching, automatic winding, and then homogenization treatment.

[0049] Example 4 S1, Aluminum Molten Metal Melting Aluminum liquid with an aluminum content ≥99.70% is loaded into a melting furnace, and 30% solid cold material is added. The melting temperature is controlled at 745℃ for the first refining. After slag removal, 20% aluminum-manganese alloy and 20% aluminum-chromium alloy are added to the furnace according to the batching for the second refining. After slag removal, 10% aluminum-titanium alloy and 99.9% metallic magnesium are added for the third refining. Under argon conditions, sodium-free granular refining agent is used to spray the melt for 15 minutes.

[0050] S2, Online Melt Processing The online degassing of molten aluminum employs a dual-chamber, dual-rotor degassing device with an ultra-high temperature-resistant silicon nitride rotor. Argon and dichloroethane are used as degassing media to purify the melt online through the rotor, reducing the hydrogen content to less than 0.12 mg / 100 ml. After degassing, the melt is further purified by PTF tubular filtration. AlTi5B1 aluminum titanium boron wire refiner is added online to the high-purity melt, and ultrasonic treatment is introduced to enhance the refinement effect. The refined melt is then filtered again using CFF plate filtration to eliminate secondary gas absorption and oxide inclusions caused by the addition of the refiner.

[0051] S3, Continuous casting of molten aluminum The molten metal is introduced into the intermediate ladle using a primary laser automatic control device. The molten metal from the intermediate ladle is then automatically introduced into the small ladle via a secondary balance, maintaining the molten metal level fluctuation in the small ladle within 0-0.5mm. It is then encased by a Ф1100mm three-sided copper trapezoidal small-section hollow crystallizing wheel and a 2.0mm thick special steel strip, forming a 645mm cross-section. 2 The crystallization chamber is subjected to constant pressure, constant flow and constant temperature water cooling casting on 4 sides and 6 zones, with a casting speed of 1.2t / h.

[0052] S4, Milling the surface of the cast billet The surface of the cast billet is milled online to a thickness of 0.2-0.5 mm.

[0053] S5. Reheating of the billet The billet is reheated using a medium-frequency induction furnace to ensure that the billet reaches a temperature of 380℃ after heating.

[0054] S6, rough rolling of cast billet It adopts a two-roll, two-pass rolling process.

[0055] S7, Precision rolling of cast billet The roughing billet is continuously rolled in 6 passes using three rollers to obtain 5356 aluminum alloy welding material, the size of which is φ8mm.

[0056] S8, Quenching and Homogenization Treatment The 5356 aluminum alloy welding material is subjected to online atomization quenching and automatic winding using a close-packed automatic winding machine with dual-disc fully automatic switching, achieving close-packed layer winding of 1900-2200kg per roll, followed by homogenization treatment.

[0057] The tensile strength, diameter deviation, and surface quality of the 5356 aluminum alloy welding material produced by the continuous casting and rolling process used in the example were tested. The test results are shown in the table below:

[0058] As can be seen from the table above, the Ф8mm 5356 aluminum alloy welding material produced according to the method in Example 4 exhibits stable tensile strength, stable and good elongation, small diameter deviation, and a smooth surface free of burrs, cracks, peeling, oxide scale, and other surface quality defects. This fully demonstrates the value of this application. In actual production, a smooth and defect-free surface can prevent defects such as slag inclusions and porosity during welding, improving the density and mechanical properties of the welded joint; a higher elongation indicates that the welding material has strong deformation capacity during welding, preventing the joint from cracking due to stress concentration, and significantly improving the toughness and fatigue resistance of the welded structure.

[0059] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in the prior art that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0060] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process, characterized in that, Includes the following steps: S1. Aluminum molten metal smelting: Aluminum molten metal is loaded into a smelting furnace, 20-40% solid cold material is added, the smelting temperature is 740-760℃, intermediate alloy is added according to the batching to alloy the aluminum molten metal, under argon conditions, the melt is refined by spraying powder with refining agent for 10-20 minutes, and after refining, the dross on the surface of the aluminum molten metal is removed. S2. Online melt treatment: The melt is purified online using a degassing device, and then further purified by a PTF tubular filter. A finer agent is added online, and ultrasonic treatment is introduced to refine the melt, which is then filtered using a CFF plate filter. S3. Continuous casting of aluminum liquid: The transfer casting melt is introduced into the intermediate ladle using a first-level laser automatic control device. The melt in the intermediate ladle is introduced into the small ladle through a second-level balance automatic flow control. The crystallization cavity is formed by the crystallizing wheel and a special steel strip, and the casting is carried out by constant pressure, constant flow and constant temperature water cooling. S4. Milling the surface of the cast billet: Performing online milling on the surface of the cast billet; S5. Reheating of the billet: The billet is heated online automatically at a constant temperature to obtain the billet to be rolled. S6. Slab rough rolling: Two-roll, two-pass rolling is used to ensure that the cross-sectional area of ​​the slab entering the rolling mill is reduced by more than 30% to obtain the rough rolled slab. S7. Finishing rolling of cast billet: The rough-rolled billet is continuously rolled by three rollers in 6 passes to obtain 5356 aluminum alloy welding material. S8. Quenching and homogenization treatment: The 5356 aluminum alloy welding material is quenched online by atomization, automatically wound, and then homogenized.

2. The method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process according to claim 1, characterized in that, In step S1, the aluminum liquid alloying process involves first adding aluminum-manganese alloy and aluminum-chromium alloy, stirring for ≥10 min, and then adding metallic magnesium and aluminum-titanium alloy, so that the composition of the melt is Si: ≤0.1wt%, Fe≤0.12wt%, Mg: 4.8-5.1wt%, Mn: 0.1-0.16wt%, Cr: 0.1-0.14wt%, Ti: 0.08-0.12wt%, Na+Li<0.0003wt%, and other single elements ≤0.05wt%.

3. The method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process according to claim 2, characterized in that, In step S1, the aluminum liquid is first refined when the temperature reaches 740-760℃; after slag removal, aluminum-manganese and aluminum-chromium alloys are added for the second refining; after slag removal, metallic magnesium and aluminum-titanium alloys are added for the third refining.

4. The method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process according to claim 1, characterized in that, In step S2, the degassing device uses a degassing medium to perform online purification of the melt through a rotor.

5. The method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process according to claim 1, characterized in that, In step S3, the surface fluctuation of the molten metal in the small ladle casting is 0-0.5 mm; the speed of the constant pressure, constant flow, and constant temperature water-cooled casting is 1.2-1.25 t / h.

6. The method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process according to claim 1, characterized in that, In step S3, the crystallizing wheel is a Ф1100mm three-sided copper trapezoidal small-section hollow crystallizing wheel.

7. The method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process according to claim 1, characterized in that, In step S4, the thickness of the online milled surface is 0.2-0.5 mm.

8. The method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process according to claim 1, characterized in that, In step S5, the automatic constant temperature heating process is carried out in a medium frequency induction furnace, and the temperature of the billet entering the rolling mill is 350-410℃.

9. A method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process according to claim 1, characterized in that, In step S8, the 5356 aluminum alloy welding material is automatically wound using a dual-disc fully automatic switching coiler, and the length of the finished coil of the aluminum alloy welding material is ≥3000m.

10. A method for producing 5356 aluminum alloy welding materials using a continuous casting and rolling process according to claim 1, characterized in that, The 5356 aluminum alloy welding material has a size of φ8mm.

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