Manufacturing method of Al-Cu series aluminum alloy bright welding wire

Abstract

The invention provides a manufacturing method of an Al-Cu series aluminum alloy bright welding wire. The manufacturing method comprises the steps of burdening, smelting, casting, uniform heating, peeling, hot rolling, primary annealing, primary cold rolling, secondary annealing, secondary cold rolling, third annealing, intermediate drawing, fourth annealing, scraping, finish drawing, cleaning, drying and layer winding. By optimizing the composition and the processing technology of the welding wire, the prepared welding wire is high in strength and good in processing performance, welding and welding joints do not exist in the production process of the welding wire, and the consistency of the structure and overall deformation of the welding wire is ensured. A finished product can be manufactured into a disc-loaded welding wire or a barrel-loaded welding wire with a large weight, and welding materials with higher quality and higher efficiency are provided for automatic welding.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of metal material processing, in particular to a manufacturing method of Al-Cu series aluminum alloy bright welding wire. BACKGROUND

[0002] With the continuous development and upgrading of core key fields such as rail transit, new energy, automobiles, ships, aerospace, etc., the requirements for light weight and integration are continuously improved, and aluminum alloy profiles and plates have gradually replaced steel plates or stainless steel plates, and the application of aluminum alloy materials has become an inevitable trend. At the same time, with the rapid advancement of modern production technology, aluminum alloy automatic welding is rapidly replacing traditional manual welding due to its significant advantages, and the application breadth and depth continue to expand, especially for super-long aluminum alloy profiles, which need to use advanced automatic welding. This technical iteration puts forward unprecedented stringent requirements on the core consumable aluminum alloy welding wire: the aluminum alloy welding wire has a super-long length, cannot be blocked or broken during the welding process, and ensures the high-quality quality of the welding seam after welding.

[0003] However, the traditional welding wire blank preparation process supporting this high-quality demand is facing severe challenges. There are two traditional welding wire production methods: one is continuous casting and rolling method: this process can produce wire blanks with acceptable overall consistency, but the alloy grade adaptability is limited, and the stability of the melt quality is poor. The more critical defect is in the process itself. In the solidification and subsequent rolling process of the molten metal, the surface is easy to roll in the unavoidable oxide film, and form an oxide black skin with strong adhesion and impurities. These surface defects are often difficult to eliminate in the subsequent mechanical scraping process, and finally significantly affect the welding wire quality, becoming a potential threat to the stable operation of automatic welding. The second is the multi-hole extrusion method: the advantage of this method is that it can use the strong pressure of the mold extrusion to leave the defects such as loose, inclusion, segregation, etc. that may exist in the material in the pressure residue and cut off, so as to obtain high-quality wire blanks with smooth surface. The disadvantage is that the wire blanks can only be produced continuously after being welded in the subsequent production, and the wire blanks at the welding position are not completely consistent in organization, which affects the performance of the welding wire at the welding position. The wire blanks at the welding position will appear broken in the subsequent production process, which not only affects the welding wire production efficiency, but also affects the performance of the welding wire at the welding position after re-welding, thereby increasing the phenomena such as broken wire, blocked wire, black smoke, etc. during the use of the welding wire.

[0004] The prior art has studied the problem of pure wire rod. For example, the patent with publication number CN101733591B proposes to produce wire rod by extrusion method, which solves the problem of surface oxidation film, inclusion, segregation and other defects of wire rod compared with continuous casting and rolling wire rod. However, the wire rod is multiple, and subsequent multi-point welding is needed to complete continuous production, which cannot guarantee the consistency of the overall organization of the welding wire. The patent with publication number CN101722381A proposes to produce Φ10-Φ14 wire rod by 2000T extrusion method, which solves the problem of surface oxidation film, inclusion, segregation and other defects of wire rod. The extrusion tool is 4 holes, each weighing 8-9 kg, and subsequent multi-point welding is needed to complete continuous production, which cannot guarantee the consistency of the overall organization performance of the welding wire. In summary, it is of great significance to provide a welding wire without welding joint and ensuring the internal quality of the welding wire. SUMMARY

[0005] The technical problem to be solved by the present application is to provide an Al-Cu aluminum alloy bright welding wire production method in view of the deficiencies of the prior art. The present application optimizes the composition and processing technology of the welding wire, and the welding wire produced has high strength and good processing performance, and the welding wire is not welded during production, has no welding joint, and ensures the consistency of the welding wire organization and overall deformation.

[0006] To solve the above technical problems, the technical scheme of the present application is:

[0007] An Al-Cu aluminum alloy bright welding wire production method, comprising batching, smelting, casting, annealing, peeling, hot rolling, primary annealing, primary cold rolling, secondary annealing, secondary cold rolling, tertiary annealing, intermediate drawing, quaternary annealing, scraping, fine drawing, cleaning, drying and layer winding.

[0008] Preferably, the composition of the Al-Cu aluminum alloy bright welding wire is as follows in terms of weight percentage: Si≤0.2%, Fe≤0.3%, Cu 5.8%-6.8%, Mn≤0.2-0.4%, Mg≤0.02%, Ti≤0.05-0.15%, Zr 0.1-0.25%, Zn≤0.10%, V 0.05-0.15%, Sc 0.05-0.20%, single impurity≤0.05%, total impurities≤0.15%, and the balance is Al.

[0009] Preferably, aluminum ingot, copper, Al-Mn, Al-Ti, Al-Zr, Al-V and Al-Sc intermediate alloy are used as raw materials during batching; the purity of the aluminum ingot is 99.9%.

[0010] Preferably, during smelting, manual stirring is adopted for 10-20 minutes, then electromagnetic stirring is adopted for 20-30 minutes, and then manual stirring is adopted for 10-20 minutes; after adding all raw materials into the furnace, the furnace is heated to 740±5 DEG C, then 0.15-0.25% of the total mass of the raw materials of the refining agent RJ-6 is added, and refining is carried out for 20-30 minutes; after refining, the dross is removed, sampling analysis is carried out, after the sample analysis is qualified, a mixed gas composed of hexachloroethane and high-purity argon with a volume ratio of 2:1 is filled into the double pipes respectively, and refining is carried out for 30-40 minutes, so that smelting is completed, and the smelting material melt is obtained.

[0011] Preferably, during casting, 0.2-0.4% of the total mass of the AlTi5B wire of the raw materials is added into the smelting material melt through the wire feeder, the speed of the wire feeder is controlled to be 1.5±0.2 m / min, and double-strand wire feeding is adopted; after the addition, on-line refining is carried out through the on-line refining device, then double-stage filtering is carried out, and on-line hydrogen content detection is carried out, so that the hydrogen content of the smelting material melt is ensured to be less than 0.1 ml / 100 g; during casting, hot top casting is adopted, the casting temperature is 700-735 DEG C, the casting speed is 35-40 mm / min, the cooling water flow during casting is controlled to be 90-120 m3 / h, the cooling water temperature is 20-30 DEG C, and the aluminum alloy cast bar with a diameter of 150 mm and a length of 5 m is obtained.

[0012] Preferably, during homogenizing, the aluminum alloy cast bar is heated to 510-530 DEG C, is kept for 24 hours, and is naturally cooled, so that the aluminum alloy homogenized cast bar is obtained.

[0013] Preferably, during peeling, the single-side peeling amount of the bar is greater than or equal to 3 mm.

[0014] During hot rolling, the temperature is 460-490 DEG C, and the diameter of the wire after hot rolling is 10-11 mm.

[0015] Preferably, the temperature of the primary annealing, the secondary annealing, the third annealing and the fourth annealing is 390-430 DEG C, and the time is 4-5 hours.

[0016] Preferably, the diameter of the wire after the primary cold rolling is 6-7.2 mm, and the diameter of the wire after the secondary cold rolling is 3.9-4.2 mm.

[0017] Preferably, during intermediate drawing, the wire is drawn through 4-5 groups of drawing dies, and the diameter of the wire after intermediate drawing is 2.4-2.7 mm; during fine drawing, the wire is drawn through 10-13 groups of drawing dies, and the diameter of the wire after fine drawing is 1.1-1.3 mm.

[0018] Preferably, the diameter of the wire after scraping is 2.3-2.5 mm, and the scraping amount is 10-12 wires.

[0019] Thanks to the above technical solutions, the present application has the following advantages:

[0020] The application provides an Al-Cu series aluminum alloy bright welding wire, by adding a rare earth element Sc, the aluminum alloy can increase component undercooling during melting and casting, refine grains, reduce secondary intergranular spacing, reduce gas mixed inclusions in the aluminum alloy, and make inclusions tend to spheroidization, which is beneficial to pouring into an ingot, improves the processing performance of the aluminum alloy ingot, is beneficial to improving the strength of the welding wire, and thus improves the processing performance of the welding wire.

[0021] The application optimizes the preparation process of the welding wire, uniformly heats the aluminum alloy cast bar, and then performs hot rolling treatment, so that no welding joint exists in the welding wire production process, not only the oxide film rolled into the wire blank produced by the traditional continuous casting and rolling mode is avoided, but also the extrusion process is skipped, the water and electricity energy costs are saved, the problem of high process waste rate is solved, the high wire breaking rate caused by welding after extrusion is avoided, the phenomena of black smoke, wire blocking and wire breaking during welding of the welding wire by the customer are solved, the consistency of the welding wire organization and overall deformation is ensured, and the welding quality of the welding wire by the customer is effectively improved.

[0022] In the preparation of the welding wire, the hot rolling is followed by a "annealing-cold rolling" combined treatment composed of primary annealing, primary cold rolling, secondary annealing and secondary cold rolling, through multiple deformation-recrystallization cycles, the grain size is more uniform, and the step-by-step annealing can promote the precipitation of nanoscale dispersed phase, strengthen the matrix and inhibit the growth of recrystallized grains, improve the strength and toughness of the welding wire. Moreover, multiple cold rolling treatment can also effectively prevent serious work hardening caused by single large deformation cold rolling.

[0023] The application further performs scraping treatment before fine drawing, ensures the purity of the welding wire surface, and the overall deformation is consistent, so that the phenomena of black smoke, wire breaking and wire blocking during welding of the welding wire are avoided, and the quality of the welding seam is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute the embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0025] Figure 1 The 200 times metallographic graph of the cast bar of Comparative Example 1;

[0026] Figure 2 The 200 times metallographic graph of the cast bar of Example 1;

[0027] Figure 3 The 100 times metallographic graph of the cast bar of Example 1;

[0028] Figure 4Appearance of the aluminum alloy rod after hot rolling of Example 2;

[0029] Figure 5 Appearance of the aluminum alloy rod after hot rolling of Comparative Example 1. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above objectives, features and advantages of the present application, a further description will be made in the following with reference to the embodiments thereof. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict if possible.

[0031] In the following description, a lot of specific details are set forth in order to give a thorough understanding of the present application, but the present application can be implemented in other different ways from those described herein; it is obvious that the embodiments described in the specification are only some of the embodiments of the present application, but not all the embodiments.

[0032] In order to further understand the present application, the preferred embodiments of the present application will be described in the following with reference to the embodiments, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present application, but not for limiting the claims of the present application.

[0033] Example 1

[0034] A manufacturing method of an Al-Cu series aluminum alloy bright welding wire, comprising the following steps:

[0035] (1) batching:

[0036] According to the alloy composition in the welding wire: Si: 0.06%, Fe: 0.10%, Cu: 6.48%, Mn: 0.29%, Mg: 0.009%, Ti: 0.04%, Zr: 0.195%, V: 0.12%, Sc: 0.11%, single impurity ≤0.05%, total impurities ≤0.15%, the balance being Al, the aluminum is added in the form of pure aluminum ingot (purity 99.9%), the copper is added in the form of pure metal, the Mn, Ti, Zr, V and Sc are added in the form of intermediate alloy Al-Mn, Al-Ti, Al-Zr, Al-V and Al-Sc, and no waste should be added;

[0037] (2) smelting:

[0038] The ingredients are added into a smelting furnace, and after manual stirring for 15 minutes, electromagnetic stirring for 25 minutes, and manual stirring for 15 minutes, the components are more uniform; the temperature is raised to 745 DEG C, then 0.15% of the total weight of the raw materials of RJ-6 refining agent is added into the furnace, and refined for 20 minutes; after refining, the dross is removed, and the sample is analyzed; after the sample is qualified, six chloroethane and high-purity argon (the volume ratio of six chloroethane and high-purity argon is 2:1) are filled into the double tubes respectively, and refined for 35 minutes to complete smelting, and the smelting material melt is obtained;

[0039] (3) Casting:

[0040] The total mass of 0.2wt% of AlTi5B wire is added to the smelting material melt through the wire feeder, the speed control of the wire feeder is 1.5 m / min, double-strand wire feeding is adopted; the on-line refining device is used for refining, then double-stage filtering is carried out, the hydrogen content is detected on-line to ensure that the hydrogen content of the smelting material solution is 0.08 ml / 100g, finally the hot top casting method is used to prepare the aluminum alloy casting rod, the casting speed is 35 mm / min, the casting temperature is controlled at 720 DEG C, the cooling water flow is controlled at 90 m 3 / h during the casting process, the cooling water temperature is 20 DEG C, and the aluminum alloy casting rod with a diameter of Φ150 mm and a length of 5 m is obtained;

[0041] (4) Homogenization:

[0042] The aluminum alloy casting ingot is heated to 510 DEG C, and after 24 h of heat preservation, it is naturally cooled to room temperature to obtain the aluminum alloy casting rod;

[0043] (5) Skin peeling:

[0044] The above aluminum alloy casting rod is subjected to skin peeling treatment, and the amount of skin peeling is ensured to be greater than or equal to 3 mm on one side;

[0045] (6) Hot rolling:

[0046] The aluminum alloy casting rod after skin peeling is hot rolled to a wire diameter of Φ10 mm at 470 DEG C;

[0047] (7) Primary annealing:

[0048] The hot-rolled wire is subjected to primary annealing at 400 DEG C, the temperature reaches 390 DEG C, and the heat preservation time is 4.0 h, and then the furnace is discharged and air cooled;

[0049] (8) Primary cold rolling:

[0050] The primary annealed wire is cold rolled to obtain a wire with a diameter of 6.92 mm;

[0051] (9) Secondary annealing:

[0052] After the first cold rolling, the wire is annealed at 400℃, and when the temperature reaches 390℃, the annealing timer starts, and the annealing time is 4.0h, and then the furnace is discharged and air cooled;

[0053] (10) Second cold rolling:

[0054] After the second annealing, the wire is cold rolled to obtain a wire with a diameter of 4.02mm;

[0055] (11) Third annealing;

[0056] After the second cold rolling, the wire is annealed at 400℃, and when the temperature reaches 390℃, the annealing timer starts, and the annealing time is 4.0h, and then the furnace is discharged and air cooled;

[0057] (12) Intermediate drawing:

[0058] After the third annealing, the wire is drawn through multiple groups of drawing dies to obtain a wire with a diameter of Φ2.52mm;

[0059] (13) Fourth annealing:

[0060] After the intermediate drawing, the wire is annealed at 400℃, and when the temperature reaches 390℃, the annealing timer starts, and the annealing time is 4.0h, and then the furnace is discharged and air cooled;

[0061] (14) Skiving:

[0062] After the fourth annealing, the wire is skived to Φ2.40mm, and the skiving amount is 10 wires to ensure that the surface of the welding wire is clean and bright;

[0063] (15) Fine drawing:

[0064] The wire obtained in step (14) is drawn through multiple groups of drawing dies to a welding wire with a diameter of Φ1.2mm;

[0065] (16) Cleaning, drying and layer winding:

[0066] The welding wire after step (15) is drawn is ultrasonically cleaned and dried, and finally according to the use of the user, the wire is packed and the finished welding wire is obtained.

[0067] Example 2

[0068] A method for manufacturing an Al-Cu series aluminum alloy bright welding wire, comprising the following steps:

[0069] (1) Blending:

[0070] The ingredients are prepared according to the alloy composition in the welding wire: Si: 0.04%, Fe: 0.08%, Cu: 6.11%, Mn: 0.29%, Mg: 0.004%, Ti: 0.05%, Zr: 0.195%, V: 0.10%, Sc: 0.18%, individual impurities ≤0.05%, total impurities ≤0.15%, and the balance being Al, pure aluminum ingots (purity 99.9%) are added for Al, pure metals are added for Cu, Al-Mn, Al-Ti, Al-Zr, Al-V, and Al-Sc intermediate alloys are added for Mn, Ti, Zr, V, and Sc, and no waste materials are added;

[0071] (2) Melting:

[0072] The above ingredients are added to a melting furnace, manual stirring is performed for 15 minutes, electromagnetic stirring is performed for 25 minutes, and then manual stirring is performed for 15 minutes to make the composition more uniform; the temperature is raised to 740°C, then 0.15% of the total weight of the raw materials of RJ-6 refining agent is added to the furnace, and refining is performed for 20 minutes; after refining, the dross is removed, and sampling analysis is performed; after the sample analysis is qualified, six chloroethane and high-purity argon (the volume ratio of six chloroethane and high-purity argon is 2:1) are separately filled into a double pipe to refine for 35 minutes, the melting is completed, and a molten melt of the melting material is obtained;

[0073] (3) Casting:

[0074] The AlTi5B wire with a total mass of 0.3% of the raw materials is added to the molten melt of the melting material through a wire feeder, the speed control of the wire feeder is 1.5 m / min, double-strand wire feeding is adopted, refining is performed through an online refining device, double-stage filtration is performed, the hydrogen content is detected online to ensure that the hydrogen content of the melting material solution is 0.08 ml / 100g, and finally hot top casting is adopted to prepare an aluminum alloy ingot, the casting speed is 38 mm / min, the casting temperature is controlled at 735°C, the cooling water flow is controlled at 100 m 3 / h during the casting process, the cooling water temperature is 30°C, and an aluminum alloy cast bar with a diameter of 150 mm and a length of 5 m is obtained;

[0075] (4) Homogenization:

[0076] The aluminum alloy ingot is heated to 530°C, and after holding for 24 hours, it is naturally cooled to room temperature to obtain an aluminum alloy cast bar;

[0077] (5) Skin peeling:

[0078] The above aluminum alloy cast bar is subjected to skin peeling treatment, and the amount of skin peeling is ensured to be ≥3 mm on one side;

[0079] (6) Hot rolling:

[0080] The bar material obtained in step (4) is hot rolled to a wire diameter of Φ10 mm at 490°C; the wire is cooled to room temperature, and then the wire is cut to obtain an aluminum alloy wire with a diameter of Φ10 mm;Figure 2 It can be seen that the surface of the wire rod obtained by hot rolling is smooth and clean without crack defects;

[0081] (7) Primary annealing:

[0082] After the annealing furnace is heated to 400℃, the wire rod wound on the spool is loaded, and the temperature of the metal is ensured to be 400℃. When the temperature reaches 390℃, the temperature holding timer is started, and the temperature holding time is 4.3h. Then the furnace is discharged and air cooled;

[0083] (8) Primary cold rolling:

[0084] The wire rod after primary annealing is cold rolled to obtain a wire rod with a diameter of 7mm;

[0085] (9) Secondary annealing:

[0086] After the annealing furnace is heated to 400℃, the wire rod wound on the spool is loaded, and the temperature of the metal is ensured to be 400℃. When the temperature reaches 390℃, the temperature holding timer is started, and the temperature holding time is 4.3h. Then the furnace is discharged and air cooled;

[0087] (10) Secondary cold rolling:

[0088] The wire rod after secondary annealing is cold rolled to obtain a wire rod with a diameter of 4.0mm;

[0089] (11) Third annealing:

[0090] After the annealing furnace is heated to 400℃, the wire rod wound on the spool is loaded, and the temperature of the metal is ensured to be 400℃. When the temperature reaches 390℃, the temperature holding timer is started, and the temperature holding time is 4.3h. Then the furnace is discharged and air cooled;

[0091] (12) Intermediate drawing:

[0092] The wire rod after third annealing is drawn through multiple groups of drawing dies to obtain a wire rod with a diameter of Φ2.52mm;

[0093] (13) Fourth annealing:

[0094] After the annealing furnace is heated to 400℃, the wire rod wound on the spool is loaded, and the temperature of the metal is ensured to be 400℃. When the temperature reaches 390℃, the temperature holding timer is started, and the temperature holding time is 4.3h. Then the furnace is discharged and air cooled;

[0095] (14) Skiving:

[0096] The wire rod after fourth annealing is skived to Φ2.40mm, and the skiving amount is 10 wires to ensure that the surface of the welding wire is clean and bright;

[0097] (15) Final drawing:

[0098] The wire obtained in step (14) is drawn through multiple sets of drawing dies to a finished product of Φ1.2 mm welding wire;

[0099] (16) cleaning, drying, layer winding:

[0100] The welding wire after drawing in step (15) is subjected to ultrasonic cleaning and drying, and finally is subjected to disc wire packaging according to the use condition of the user to obtain the finished product welding wire.

[0101] The appearance of the aluminum alloy rod after hot rolling in the embodiment is shown in Figure 4 .

[0102] Example 3

[0103] The difference between the embodiment and example 1 is that the content of Sc is 0.06wt%, and other operations are the same as those in example 1.

[0104] The difference between the embodiment and example 1 is that the content of Sc is 0.10wt%, and other operations are the same as those in example 1.

[0105] The metallographic photos of the cast rods in examples 1-4 are shown in (a), (b), (c) and (d) in Figure 3 respectively.

[0106] As can be seen from Figure 3 , through 100 times of metallographic structure comparison, within a certain range, with the increase of the content of the rare earth element Sc, the grain size of the cast rod is gradually refined.

[0107] Comparative example 1

[0108] The difference between the comparative example and example 2 is that no Sc element is added, and other operations are the same as those in example 2. The metallographic photo of the cast rod in the comparative example is shown in Figure 1 ; and the appearance of the aluminum alloy rod after hot rolling in the comparative example is shown in Figure 5 .

[0109] As can be seen from Figure 1 and Figure 2 , through 200 times of metallographic structure comparison, the grain size of the rare earth Sc added in example 1 is obviously refined.

[0110] As can be seen from Figure 4 and Figure 5 , the aluminum alloy rod in example 2 is added with the Sc element, and after extrusion and hot rolling, the surface of the wire blank is smooth and clean without crack defects; and the aluminum alloy rod in comparative example 1 is not added with the Sc element, and after extrusion and hot rolling, small crack defects occasionally appear on the surface of the wire blank.

[0111] Comparative example 2

[0112] The difference between the present comparative example and Example 2 is that no primary annealing is performed after hot rolling, and cold rolling is directly performed, and other operations are the same as those in Example 2.

[0113] Comparative Example 3

[0114] The difference between the present comparative example and Example 2 is that steps (9) and (10) are not included, and other operations are the same as those in Example 2.

[0115] The performance parameters of the welding wires prepared in the above examples and comparative examples are shown in Table 1.

[0116] Table 1

[0117]

[0118] As can be seen from Table 1, relative to the comparative examples, the welding wire obtained by adding Sc element in the alloy and optimizing the manufacturing process of the welding wire has high strength and excellent processing performance.

[0119] Comparative Example 1 does not add Sc, and the strength and plasticity of the welding wire are significantly reduced. Because Sc can form Al3Sc nanoparticles, inhibit recrystallization and refine grains, the strength and elongation are improved. The alloy without Sc is prone to crack during hot rolling, and the elongation is also significantly reduced.

[0120] In Comparative Example 2, hot rolling is not followed by annealing, and cold rolling is directly performed, which results in that the residual stress before cold rolling is not eliminated, and the elongation is greatly reduced.

[0121] Comparative Example 3 does not perform secondary annealing and secondary cold rolling, which reduces the opportunity for primary recrystallization, and the microstructure uniformity is poor, and the strength and elongation are lower than those in Example 2.

[0122] The grain fineness of the casting bars in Examples 1-4 is shown in Table 2.

[0123] Table 2

[0124]

[0125] As can be seen from the test results in Table 2, when the addition amount of Sc is 0.11% of the total mass of raw materials, the average particle size of the alloy is 143.83 μm; when the addition amount of Sc is 0.18% of the total mass of raw materials, the average particle size of the alloy is 124.75 μm; when the addition amount of Sc is 0.06% of the total mass of raw materials, the average particle size of the alloy is 161.07 μm; and when the addition amount of Sc is 0.10% of the total mass of raw materials, the average particle size of the alloy is 150.49 μm. In summary, within a certain range, as the content of rare earth element Sc increases, the grain size of the casting bar decreases.

[0126] The principles and implementations of the present application are described herein with specific examples, and the above descriptions of the examples are only used to help understand the method of the present application and its core ideas, including the best mode, and also enable any person skilled in the art to practice the present application, including manufacturing and using any device or system, and implementing any combined method. It should be noted that, for those skilled in the art, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application. The scope of patent protection of the present application is defined by the claims, and can include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to the literal expressions of the claims, or if they include equivalent structural elements that are not substantially different from the literal expressions of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. A method for producing an Al-Cu series aluminum alloy bright welding wire, characterized by: It comprises batching, smelting, casting, homogenizing, peeling, hot rolling, primary annealing, primary cold rolling, secondary annealing, secondary cold rolling, tertiary annealing, intermediate drawing, quaternary annealing, scraping, fine drawing, cleaning, drying and layer winding.

2. The method for producing an Al-Cu series aluminum alloy bright welding wire according to claim 1, characterized by: The Al-Cu aluminum alloy bright welding wire comprises the following components in percentage by weight: Si≤0.2%, Fe≤0.3%, Cu 5.8%-6.8%, Mn≤0.2-0.4%, Mg≤0.02%, Ti≤0.05-0.15%, Zr 0.1-0.25%, Zn≤0.10%, V 0.05-0.15%, Sc 0.05-0.20%, single impurity≤0.05%, total impurities≤0.15%, and the balance of Al.

3. The method of claim 1, wherein the Al-Cu series aluminum alloy bright welding wire is produced by the steps of: Aluminum ingots, copper ingots, Al-Mn, Al-Ti, Al-Zr, Al-V and Al-Sc intermediate alloys are used as raw materials in the batching process. ​ 4. The method of claim 1, wherein the Al-Cu series aluminum alloy bright welding wire is produced by the steps of: In the smelting process, manual stirring is performed for 10-20 minutes, followed by electromagnetic stirring for 20-30 minutes, and then manual stirring for 10-20 minutes. ​ 5. The method of claim 1, wherein the Al-Cu series aluminum alloy bright welding wire is produced by the steps of: During casting, 0.2-0.4% of AlTi5B wire in total mass of raw materials is fed into the smelting melt through a wire feeder, the speed control of the wire feeder is 1.5±0.2 m / min, double-strand wire feeding is adopted; after adding, on-line refining device is used for refining, double-stage filtering is carried out, on-line hydrogen content detection is carried out, and the hydrogen content of the smelting melt is ensured to be <0.1 ml / 100 g; during casting, hot top casting mode is adopted, the casting temperature is 700-735 ℃, the casting speed is 35-40 mm / min, the cooling water flow during casting is controlled to be 90-120 m 3 / h, the cooling water temperature is 20-30 ℃, and an aluminum alloy ingot with a diameter of 150 mm and a length of 5 m is obtained. ​ 6. The method of claim 1, wherein the Al-Cu series aluminum alloy bright welding wire is produced by the steps of: After the raw materials are added into the furnace, the furnace is heated to 740±5℃, and then 0.15-0.25% of the total mass of the raw materials of RJ-6 refining agent is added, and refining is performed for 20-30 minutes. ​ In the homogenizing process, the aluminum alloy ingot is heated to 510-530℃, and then naturally cooled after being kept for 24 hours to obtain an aluminum alloy homogenized bar. In the peeling process, the amount of peeling on one side of the bar is greater than or equal to 3mm.

7. The method of claim 1, wherein the Al-Cu series aluminum alloy bright welding wire is produced by the steps of: The temperature in the hot rolling process is 460-490℃, and the diameter of the wire after hot rolling is 10-11mm. ​ 8. The method of claim 1, wherein the Al-Cu series aluminum alloy bright welding wire is produced by the steps of: The temperature in the primary annealing, secondary annealing, tertiary annealing and quaternary annealing processes is 390-430℃, and the time is 4-5h. ​ 9. The method of claim 1, wherein the Al-Cu series aluminum alloy bright welding wire is produced by the steps of: The diameter of the wire after primary cold rolling is 6-7.2mm, and the diameter of the wire after secondary cold rolling is 3.9-4.2mm. ​ 10. The method of claim 1, wherein the Al-Cu series aluminum alloy bright welding wire is produced by the steps of: In the intermediate drawing process, the wire is drawn through 4-5 groups of drawing dies, and the diameter of the wire after intermediate drawing is 2.4-2.7mm. In the fine drawing process, the wire is drawn through 10-13 groups of drawing dies, and the diameter of the wire is 1.1-1.3mm. The diameter of the wire after scraping is 2.3-2.5mm, and the scraping amount is 10-12 wires. ​

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