Zinc-based welding wire for copper-aluminum arc welding and preparation method thereof

Abstract

The present invention discloses a zinc-based welding wire for copper-aluminum arc welding, comprising a flux core and a welding sheath. The flux core comprises the following components by mass percentage: 40.0-45.0% Sn powder, 20.0-25.0% Bi powder, 10.0-15.0% In powder, 5.0-10.0% Ag powder, 0.5-1.0% CeO2 powder, and the remainder Zn powder. The welding wire has a low melting point and, by regulating multiple elements, can effectively control the brittle phase content of the copper-aluminum joint, thereby ensuring high-quality aluminum-copper connections. A preparation method for the zinc-based welding wire for copper-aluminum arc welding is also disclosed.

Description

Technical Field

[0001] The invention belongs to the field of metal materials, and in particular relates to a zinc-based welding wire for copper-aluminum arc welding, and also relates to a preparation method of the zinc-based welding wire for copper-aluminum arc welding. Background Art

[0002] In my country, the shortage of copper resources and the high copper prices in recent years have prompted researchers to seek copper substitutes. Among discovered metals, aluminum ranks fourth in electrical and thermal conductivity, after silver, copper, and gold. Copper accounts for only 0.01% of the Earth's crust (by mass fraction), while aluminum accounts for 8%. Aluminum's density is much lower than copper's, so replacing copper with aluminum can significantly reduce component weight. Therefore, the research and application of aluminum-copper replacements holds broad promise and far-reaching significance. In these applications, dissimilar aluminum-copper connections are essential.

[0003] Welding aluminum and copper is difficult due to the strong oxidizing properties of both materials. Aluminum is highly oxidizable, both in solid and liquid form, and brittle intermetallic compounds can easily form between the two materials, reducing the mechanical properties of the joint. Furthermore, the significant differences in thermophysical properties between aluminum and copper create significant challenges when welding dissimilar materials. Summary of the Invention

[0004] The first object of the present invention is to provide a zinc-based welding wire for copper-aluminum arc welding. The welding wire has a low melting point and, combined with the regulation of multiple elements, can effectively control the brittle phase content of the copper-aluminum joint, thereby ensuring high-quality aluminum-copper connection.

[0005] A second object of the present invention is to provide a method for preparing a zinc-based welding wire for copper-aluminum arc welding.

[0006] The first technical solution adopted by the present invention is a zinc-based welding wire for copper-aluminum arc welding, comprising a flux core and a welding cover, wherein the flux core comprises the following components by mass percentage: Sn powder 40.0~45.0%, Bi powder 20.0~25.0%, In powder 10.0~15.0%, Ag powder 5.0~10.0%, CeO2 powder 0.5~1.0%, and the rest is Zn powder.

[0007] The present invention is also characterized in that:

[0008] The purity of each drug core powder is ≥99.9%; the particle size of each drug core powder is 100~200 mesh.

[0009] The soldering skin is Zn tape with a thickness of 0.4 mm and a width of 7 mm.

[0010] The filling amount of the flux core powder in the flux cored welding wire is controlled at 30wt%~33wt%.

[0011] The second technical solution adopted by the present invention is a method for preparing a zinc-based welding wire for copper-aluminum arc welding, which comprises the following specific steps:

[0012] Step 1: Weigh 40.0-45.0% Sn powder, 20.0-25.0% Bi powder, 10.0-15.0% In powder, 5.0-10.0% Ag powder, 0.5-1.0% CeO2 powder, and the rest Zn powder according to mass percentage;

[0013] Step 2: Place the powders weighed in step 1 in a vacuum heating furnace and heat them at a temperature of 100°C to 120°C for 1 hour to 2 hours to remove the crystal water in the powders; place the dried powders in a powder mixer and mix them thoroughly for 30 minutes to 40 minutes;

[0014] Step 3: Use alcohol to remove grease from the surface of the Zn strip, and wrap the mixed powder prepared in step 2 into the Zn steel strip through a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm.

[0015] Step 4: After the first drawing process is completed, the die aperture is reduced in sequence to finally obtain a flux-cored welding wire with a diameter of 1.2 mm;

[0016] Step 5: After the flux-cored wire is drawn, it is wound onto a wire reel by a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for use.

[0017] The present invention is also characterized in that:

[0018] In step 1, the purity of each core powder is ≥99.9%; and the particle size of each core powder is 100-200 mesh.

[0019] In step 3, the Zn strip is the soldering skin, with a thickness of 0.4 mm and a width of 7 mm.

[0020] In step 3, the filling amount of the flux-cored powder in the flux-cored welding wire is controlled to be 30 wt% to 33 wt%.

[0021] The beneficial effects of the present invention are:

[0022] (1) In view of the large difference in thermal physical properties between copper and aluminum dissimilar materials, the present invention develops a zinc-based welding material with a low melting point, thereby effectively controlling the temperature gradient during welding of dissimilar materials and reducing stress concentration.

[0023] (2) Brittle Cu-Al intermetallic compounds are easily generated during the welding of copper-aluminum dissimilar materials. The method of using the zinc-based welding wire of the present invention for connecting copper-aluminum dissimilar plates is as follows: first, a zinc-based transition layer is prefabricated on the copper side, and then the copper-aluminum dissimilar materials are welded; this welding method can effectively isolate the formation of Cu and Al brittle phases and can effectively improve welding efficiency.

[0024] (3) The zinc-based welding wire designed by the present invention comprehensively regulates the phase composition of the copper-aluminum dissimilar material joint by adding elements such as Sn, Bi and Ag, reduces the content and distribution of the brittle phase, and effectively reduces the melting point of the welding wire.

[0025] (4) The welding wire of the present invention can be welded by TIG welding or MIG welding.

[0026] (5) To address the numerous difficulties encountered when welding dissimilar materials such as aluminum and copper, the present invention has designed a zinc-based welding wire for direct fusion welding of aluminum and copper. The developed welding wire has a low melting point and, combined with the regulation of multiple elements, can effectively control the brittle phase content of the copper-aluminum joint, thereby ensuring a high-quality aluminum-copper connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a schematic flow chart of a method for connecting copper-aluminum dissimilar plates using the zinc-based welding wire of the present invention.

[0028] Figure 2 The microstructure of the copper-aluminum dissimilar material joint prepared in Example 2 is shown.

[0029] Figure 3 This is the scanning electron microscope morphology of the tensile fracture of the copper-aluminum dissimilar material joint prepared in Example 2. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] The invention provides a zinc-based welding wire for copper-aluminum arc welding, comprising a flux core and a welding cover, wherein the flux core comprises the following components by mass percentage: 40.0-45.0% of Sn powder, 20.0-25.0% of Bi powder, 10.0-15.0% of In powder, 5.0-10.0% of Ag powder, 0.5-1.0% of CeO2 powder, and the remainder is Zn powder.

[0032] The roles and functions of the main components of the above welding wire are as follows:

[0033] (1) The main element of the welding wire is Zn: From the Zn-Al and Zn-Cu binary phase diagrams, it can be seen that Zn has a large mutual solid solubility with Al and Cu, and the electrode potentials of Zn and Al are similar, so the corrosion resistance of the joint is good. The reaction between Zn and Al will generate an aluminum-based solid solution primary phase and eutectic structure. Although the reaction between the two will generate a brittle phase, since the welding wire designed by the present invention has a low melting point and the arc is mainly concentrated on the copper side, the melting of the Al side is less, so the generated intermetallic compound will be mainly surrounded by the zinc-based solid solution, and the overall toughness is better. Although intermetallic compounds will also be generated between Zn and Cu, due to the low melting point of the welding wire, when the transition layer is prepared on the copper side using the welding wire, the melting amount of copper itself is less, so the Cu content in the transition layer is low, and the content of the formed intermetallic compound is also low.

[0034] (2) The main element in the welding wire is Sn: According to the Sn-Cu binary phase diagram, although intermetallic compounds will be produced between the two, the addition of Bi allows Sn, Cu, and Bi to form a eutectic phase with relatively good toughness. And because the welding wire is mainly composed of Zn, the above eutectic phase will be dispersed in the Zn solid solution, with good toughness. In addition, during welding, liquid Sn and Cu will react below 415℃ to form a solid-liquid isomeric compound, which can promote the spread and flow of the molten pool on the aluminum surface.

[0035] (3) Bi is added to the welding wire: According to the Cu-Bi binary phase diagram, the two elements do not form a brittle phase. According to the Al-Bi binary phase diagram, the two elements do not form a brittle phase. According to the Bi-Sn binary phase diagram, the two elements can form a eutectic phase. Therefore, the addition of Bi can effectively lower the melting point of the welding wire, thereby reducing the melting of the aluminum and copper base materials.

[0036] (4) In is added to the welding wire: In has a relatively low melting point of 156°C, so the main purpose of adding In is to lower the melting point of the welding wire. In addition, according to the Al-In binary phase diagram, the two do not form a brittle intermetallic compound phase. The Cu-In binary phase diagram shows that the two have a high mutual solid solubility.

[0037] (5) Ag is added to the welding wire: From the Ag-Al binary phase diagram, it can be seen that Ag and Al can directly form a solid solution. From the Ag-Cu binary phase diagram, it can be seen that the two are mutually soluble. Therefore, adding Ag to the welding wire can promote the metallurgical bonding between the transition layer and the copper side, and promote the high-quality bonding between copper and aluminum.

[0038] (6) CeO2 powder is added to the welding wire: The added CeO2 element has strong oxidizing properties. Therefore, when copper-aluminum welding is performed, CeO2 has the function of removing the oxide film on the Al side, thereby ensuring the fluidity and spreadability of the molten pool metal.

[0039] The purity of each drug core powder is ≥99.9%; the particle size of each drug core powder is 100~200 mesh.

[0040] The soldering skin is Zn tape with a thickness of 0.4 mm and a width of 7 mm.

[0041] The filling amount of the flux core powder in the flux cored welding wire is controlled at 30wt%~33wt%.

[0042] The present invention also provides a method for preparing a zinc-based welding wire for copper-aluminum arc welding, the specific steps of which are as follows:

[0043] Step 1: Weigh 40.0-45.0% Sn powder, 20.0-25.0% Bi powder, 10.0-15.0% In powder, 5.0-10.0% Ag powder, 0.5-1.0% CeO2 powder, and the rest Zn powder according to mass percentage;

[0044] In step 1, the purity of each drug core powder is ≥99.9%; and the particle size of each drug core powder is 100 mesh to 200 mesh.

[0045] Step 2: Place the powders weighed in step 1 in a vacuum heating furnace and heat them at a temperature of 100°C to 120°C for 1 hour to 2 hours to remove the crystal water in the powders; place the dried powders in a powder mixer and mix them thoroughly for 30 minutes to 40 minutes;

[0046] Step 3: Use alcohol to remove grease from the surface of the Zn strip, and wrap the mixed powder prepared in step 2 into the Zn steel strip through a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm.

[0047] In step 3, the Zn strip is the soldering skin, with a thickness of 0.4 mm and a width of 7 mm.

[0048] In step 3, the filling amount of the flux-cored powder in the flux-cored welding wire is controlled to be 30 wt% to 33 wt%.

[0049] Step 4: After the first drawing process is completed, the die aperture is reduced in sequence to finally obtain a flux-cored welding wire with a diameter of 1.2 mm;

[0050] Step 5: After the flux-cored wire is drawn, it is wound onto a wire reel by a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for use.

[0051] The method for connecting copper-aluminum dissimilar plates using the zinc-based welding wire of the present invention comprises the following steps ( Figure 1 shown):

[0052] (1) First, the welding wire of the present invention is selected to prepare a transition layer on the copper side, wherein the transition layer thickness is 1.5 mm to 2.0 mm and the welding current is 120 A to 150 A;

[0053] (2) Next, the welding wire of the present invention is selected to weld the copper-aluminum dissimilar material joint, the arc is started at the transition layer, and the welding current is 130A~160A.

[0054] Example 1

[0055] Step 1: Weigh 40.0% Sn powder, 20.0% Bi powder, 10.0% In powder, 5.0% Ag powder, 0.5% CeO2 powder, and the rest Zn powder according to mass percentage. The sum of the mass percentages of the above components is 100%.

[0056] In step 1, the purity of each drug core powder is ≥99.9%; and the particle size of each drug core powder is 100 mesh.

[0057] Step 2: Place the powders weighed in step 1 in a vacuum heating furnace and heat them at 100°C for 1 hour to remove the crystal water in the powders; place the dried powders in a powder mixer and mix them thoroughly for 30 minutes;

[0058] Step 3: Use alcohol to remove the grease on the surface of the Zn strip, and wrap the powder prepared in step 2 into the Zn steel strip through a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm.

[0059] In step 3, the Zn strip is the soldering skin, with a thickness of 0.4 mm and a width of 7 mm.

[0060] In step 3, the filling amount of the flux-cored powder in the flux-cored welding wire is controlled to be 30 wt %.

[0061] Step 4: After the first drawing process is completed, the die aperture is reduced in sequence to finally obtain a flux-cored welding wire with a diameter of 1.2 mm.

[0062] Step 5: After the flux-cored wire is drawn, it is wound onto a wire reel by a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for use.

[0063] The method for connecting copper-aluminum dissimilar plates using the welding wire prepared in Example 1 is as follows ( Figure 1 shown):

[0064] (1) First, the welding wire of the present invention is selected to prepare a transition layer on the copper side, the transition layer thickness is 1.5 mm, and the welding current is 120~150A;

[0065] (2) Next, the welding wire of the present invention is selected to weld the copper-aluminum dissimilar material joint, the arc is started at the transition layer, and the welding current is 130~160A.

[0066] After testing, the results of copper-aluminum dissimilar joints are as follows:

[0067] (1) There are no cracks or inclusion defects in the joint;

[0068] (2) The micro Vickers hardness of the joint is 55HV0.1;

[0069] (3) The tensile strength of the joint is 80 MPa.

[0070] Example 2

[0071] Step 1: Weigh 45.0% Sn powder, 25.0% Bi powder, 15.0% In powder, 10.0% Ag powder, 1.0% CeO2 powder, and the rest Zn powder according to mass percentage. The sum of the mass percentages of the above components is 100%.

[0072] In step 1, the purity of each drug core powder is ≥99.9%; and the particle size of each drug core powder is 200 mesh.

[0073] Step 2: Place the powders weighed in step 1 in a vacuum heating furnace and heat them at 120°C for 2 hours to remove the crystal water in the powders; place the dried powders in a powder mixer and mix them thoroughly for 40 minutes;

[0074] Step 3: Use alcohol to remove the grease on the surface of the Zn strip, and wrap the powder prepared in step 2 into the Zn steel strip through a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm.

[0075] In step 3, the Zn strip is the soldering skin, with a thickness of 0.4 mm and a width of 7 mm.

[0076] In step 3, the filling amount of the flux-cored powder in the flux-cored welding wire is controlled at 33 wt %.

[0077] Step 4: After the first drawing process is completed, the die aperture is reduced in sequence to finally obtain a flux-cored welding wire with a diameter of 1.2 mm.

[0078] Step 5: After the flux-cored wire is drawn, it is wound onto a wire reel by a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for use.

[0079] The method for connecting copper-aluminum dissimilar plates using the welding wire prepared in Example 2 is as follows ( Figure 1 shown):

[0080] (1) First, the welding wire of the present invention is selected to prepare a transition layer on the copper side, the transition layer thickness is 2.0 mm, and the welding current is 120-150 A;

[0081] (2) Next, the welding wire of the present invention is selected to weld the copper-aluminum dissimilar material joint, the arc is started at the transition layer, and the welding current is 130~160A.

[0082] After testing, the results of copper-aluminum dissimilar joints are as follows:

[0083] (1) There are no cracks or inclusion defects in the joint;

[0084] (2) The micro-Vickers hardness of the joint is 51HV0.1;

[0085] (3) The tensile strength of the joint is 78 MPa.

[0086] Figure 2 The microstructure of the copper-aluminum dissimilar material joint prepared in Example 2 is shown in FIG. As can be seen from the figure, the eutectic phase is distributed on the solid solution phase matrix, and no microscopic defects are found.

[0087] Figure 3 This is the scanning electron microscopy morphology of the tensile fracture of the copper-aluminum dissimilar material joint structure prepared in Example 2. As can be seen from the figure, the fracture surface exhibits a certain plastic morphology.

[0088] Example 3

[0089] Step 1: Weigh 43.0% Sn powder, 23.0% Bi powder, 13.0% In powder, 7.5% Ag powder, 0.7% CeO2 powder, and the rest Zn powder according to mass percentage. The sum of the mass percentages of the above components is 100%.

[0090] In step 1, the purity of each drug core powder is ≥99.9%; and the particle size of each drug core powder is 100 mesh.

[0091] Step 2: Place the powders weighed in step 1 in a vacuum heating furnace and heat them at 110°C for 1.5 hours to remove the crystal water in the powders; place the dried powders in a powder mixer and mix them thoroughly for 35 minutes;

[0092] Step 3: Use alcohol to remove the grease on the surface of the Zn strip, and wrap the powder prepared in step 2 into the Zn steel strip through a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm.

[0093] In step 3, the Zn strip is the soldering skin, with a thickness of 0.4 mm and a width of 7 mm.

[0094] In step 3, the filling amount of the flux-cored powder in the flux-cored welding wire is controlled at 31 wt %.

[0095] Step 4: After the first drawing process is completed, the die aperture is reduced in sequence to finally obtain a flux-cored welding wire with a diameter of 1.2 mm.

[0096] Step 5: After the flux-cored wire is drawn, it is wound onto a wire reel by a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for use.

[0097] The arc welding preparation of copper-aluminum dissimilar joints was carried out using the welding wire prepared in Example 3. The specific steps are as follows ( Figure 1 shown):

[0098] (1) First, the welding wire of the present invention is selected to prepare a transition layer on the copper side, the transition layer thickness is 1.7 mm, and the welding current is 120-150 A;

[0099] (2) Next, the welding wire of the present invention is selected to weld the copper-aluminum dissimilar material joint, the arc is started at the transition layer, and the welding current is 130~160A.

[0100] After testing, the results of copper-aluminum dissimilar joints are as follows:

[0101] (1) There are no cracks or inclusion defects in the joint;

[0102] (2) The micro-Vickers hardness of the joint is 59HV0.1;

[0103] (3) The tensile strength of the joint is 82 MPa.

[0104] Example 4

[0105] Step 1: Weigh 44.0% Sn powder, 24.0% Bi powder, 14.0% In powder, 9.0% Ag powder, 0.9% CeO2 powder, and the rest Zn powder according to mass percentage. The sum of the mass percentages of the above components is 100%.

[0106] In step 1, the purity of each drug core powder is ≥99.9%; and the particle size of each drug core powder is 100 mesh.

[0107] Step 2: Place the powders weighed in step 1 in a vacuum heating furnace and heat them at 119°C for 1.2 hours to remove the crystal water in the powders; the dried powders are placed in a powder mixer and mixed thoroughly for 39 minutes;

[0108] Step 3: Use alcohol to remove the grease on the surface of the Zn strip, and wrap the powder prepared in step 2 into the Zn steel strip through a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm.

[0109] In step 3, the Zn strip is the soldering skin, with a thickness of 0.4 mm and a width of 7 mm.

[0110] In step 3, the filling amount of the flux-cored powder in the flux-cored welding wire is controlled at 32 wt %.

[0111] Step 4: After the first drawing process is completed, the die aperture is reduced in sequence to finally obtain a flux-cored welding wire with a diameter of 1.2 mm.

[0112] Step 5: After the flux-cored wire is drawn, it is wound onto a wire reel by a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for use.

[0113] The method for connecting copper-aluminum dissimilar plates using the welding wire prepared in Example 4 is as follows ( Figure 1 shown):

[0114] (1) First, the welding wire of the present invention is selected to prepare a transition layer on the copper side, the transition layer thickness is 1.9 mm, and the welding current is 120~150A;

[0115] (2) Next, the welding wire of the present invention is selected to weld the copper-aluminum dissimilar material joint, the arc is started at the transition layer, and the welding current is 130~160A.

[0116] After testing, the results of copper-aluminum dissimilar joints are as follows:

[0117] (1) There are no cracks or inclusion defects in the joint;

[0118] (2) The micro Vickers hardness of the joint is 56HV0.1;

[0119] (3) The tensile strength of the joint is 83 MPa.

[0120] Example 5

[0121] Step 1: Weigh 41.0% Sn powder, 21.0% Bi powder, 11.0% In powder, 6.0% Ag powder, 0.55% CeO2 powder, and the rest Zn powder according to mass percentage. The sum of the mass percentages of the above components is 100%.

[0122] In step 1, the purity of each drug core powder is ≥99.9%; and the particle size of each drug core powder is 100 mesh.

[0123] Step 2: Place the powders weighed in step 1 in a vacuum heating furnace and heat them at 117°C for 1.1 hours to remove the crystal water in the powders; the dried powders are placed in a powder mixer and mixed thoroughly for 32 minutes;

[0124] Step 3: Use alcohol to remove the grease on the surface of the Zn strip, and wrap the powder prepared in step 2 into the Zn steel strip through a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm.

[0125] In step 3, the Zn strip is the soldering skin, with a thickness of 0.4 mm and a width of 7 mm.

[0126] In step 3, the filling amount of the flux-cored powder in the flux-cored welding wire is controlled to be 30 wt %.

[0127] Step 4: After the first drawing process is completed, the die aperture is reduced in sequence to finally obtain a flux-cored welding wire with a diameter of 1.2 mm.

[0128] Step 5: After the flux-cored wire is drawn, it is wound onto a wire reel by a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for use.

[0129] The method for connecting copper-aluminum dissimilar plates using the welding wire prepared in Example 5 is as follows ( Figure 1 shown):

[0130] (1) First, the welding wire of the present invention is selected to prepare a transition layer on the copper side, the transition layer thickness is 1.55 mm, and the welding current is 120~150A;

[0131] (2) Next, the welding wire of the present invention is selected to weld the copper-aluminum dissimilar material joint, the arc is started at the transition layer, and the welding current is 130~160A.

[0132] After testing, the results of copper-aluminum dissimilar joints are as follows:

[0133] (1) There are no cracks or inclusion defects in the joint;

[0134] (2) The micro-Vickers hardness of the joint is 57HV0.1;

[0135] (3) The tensile strength of the joint is 87 MPa.

Claims

1. Zinc-based welding wire for copper-aluminum arc welding, characterized in that: The flux core comprises a flux core and a solder coating, wherein the flux core comprises the following components by mass percentage: 40.0-45.0% Sn powder, 20.0-25.0% Bi powder, 10.0-15.0% In powder, 5.0-10.0% Ag powder, 0.5-1.0% CeO2 powder, and the remainder Zn powder; The welding skin is Zn strip with a thickness of 0.4 mm and a width of 7 mm; the diameter of the flux-cored welding wire is 1.2 mm; The filling amount of the flux core powder in the flux cored welding wire is controlled at 30wt%~33wt%.

2. The zinc-based welding wire for copper-aluminum arc welding according to claim 1, characterized in that: The purity of each drug core powder is ≥99.9%; the particle size of each drug core powder is 100~200 mesh.

3. The method for preparing a zinc-based welding wire for copper-aluminum arc welding according to claim 1 or 2, characterized in that: The specific steps are as follows: Step 1: Weigh 40.0-45.0% Sn powder, 20.0-25.0% Bi powder, 10.0-15.0% In powder, 5.0-10.0% Ag powder, 0.5-1.0% CeO2 powder, and the rest Zn powder according to mass percentage; Step 2: Place the powders weighed in step 1 in a vacuum heating furnace and heat them at a temperature of 100°C to 120°C for 1 hour to 2 hours to remove the crystal water in the powders; place the dried powders in a powder mixer and mix them thoroughly for 30 minutes to 40 minutes; Step 3: Wrap the mixed powder prepared in step 2 in a Zn tape using a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm. Step 4: After the first drawing process is completed, the die aperture is reduced in sequence to finally obtain a flux-cored welding wire with a diameter of 1.2 mm; Step 5: After the flux-cored wire is drawn, it is wound onto a wire reel by a wire winding machine and finally sealed in a flux-cored wire vacuum packaging bag for use.

4. The method for preparing a zinc-based welding wire for copper-aluminum arc welding according to claim 3, characterized in that: In step 1, the purity of each core powder is ≥99.9%; and the particle size of each core powder is 100-200 mesh.

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