Zinc-based welding wire for copper-aluminum electric arc welding and preparation method of zinc-based welding wire

Abstract

The invention discloses a zinc-based welding wire for copper-aluminum electric arc welding, which comprises a flux core and a welding skin, and the flux core comprises the following components in percentage by mass: 40.0 to 45.0 percent of Sn powder, 20.0 to 25.0 percent of Bi powder, 10.0 to 15.0 percent of In powder, 5.0 to 10.0 percent of Ag powder, 0.5 to 1.0 percent of CeO2 powder and the balance of Zn powder. The welding wire is low in melting point, and the brittle phase content of a copper-aluminum joint can be effectively controlled in cooperation with regulation and control of multiple elements, so that aluminum-copper high-quality connection is guaranteed. The invention further discloses a preparation method of the zinc-based welding wire for copper-aluminum electric arc welding.

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 scientific and technological workers to seek substitutes for copper. Among the metals discovered, the electrical conductivity and thermal conductivity of aluminum are second only to silver, copper and gold, and rank fourth. The content of copper in the earth's crust (mass fraction) is 0.01%, while the content of aluminum is as high as 8%, and the density of aluminum is much smaller than that of copper. Replacing copper with aluminum can significantly reduce the weight of components. Therefore, the research and application of replacing copper with aluminum has broad prospects and far-reaching significance. In the application of replacing copper with aluminum, the connection method of aluminum-copper dissimilar materials is indispensable.

[0003] When welding aluminum and copper, the strong oxidizing properties of aluminum and copper make welding difficult. Aluminum is very easy to oxidize in both solid and liquid states, and brittle intermetallic compounds are easily formed between aluminum and copper, which reduces the mechanical properties of the joint. In addition, due to the large difference in thermal physical properties between aluminum and copper, it is very difficult to weld copper-aluminum 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 can effectively control the brittle phase content of the copper-aluminum joint by regulating multiple elements, thereby ensuring high-quality aluminum-copper connection.

[0005] The 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 skin, 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: The purity of each drug core powder is ≥99.9%; the particle size of each drug core powder is 100~200 mesh.

[0008] The welding skin is Zn strip with a thickness of 0.4mm and a width of 7mm.

[0009] The filling amount of the flux core powder in the flux cored welding wire is controlled at 30wt%~33wt%.

[0010] The second technical solution adopted by the present invention is a method for preparing a zinc-based welding wire for copper-aluminum arc welding, and 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 1h to 2h to remove the crystal water in the powders; place the dried powders in a powder mixer and mix them thoroughly for 30min to 40min; Step 3: Use alcohol to remove grease from the surface of the Zn strip, and wrap the mixed powder prepared in step 2 in the Zn steel strip through 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 successively, and finally a flux-cored welding wire with a diameter of 1.2 mm is obtained; Step 5: After the flux-cored welding wire is drawn, it is wound on the welding wire reel by a wire winding machine and finally sealed in a flux-cored welding wire vacuum packaging bag for standby use.

[0011] The present invention is also characterized in that: In step 1, the purity of each drug core powder is ≥99.9%; the particle size of each drug core powder is 100~200 mesh.

[0012] In step 3, the Zn strip is a soldering sheet with a thickness of 0.4 mm and a width of 7 mm.

[0013] In step 3, the filling amount of the flux core powder in the flux cored welding wire is controlled to be 30wt% to 33wt%.

[0014] The beneficial effects of the present invention are: (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.

[0015] (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 specifically 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 the welding efficiency.

[0016] (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.

[0017] (4) The welding wire of the present invention can be welded by TIG welding or MIG welding.

[0018] (5) In order to solve the many difficult problems that arise when welding dissimilar materials of aluminum and copper, the zinc-based welding wire of the present invention is designed for direct fusion welding of aluminum and copper. The developed welding wire has a low melting point and can effectively control the brittle phase content of the copper-aluminum joint by regulating multiple elements, thereby ensuring high-quality aluminum-copper connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 2 The microstructure of the copper-aluminum dissimilar material joint prepared in Example 2.

[0021] 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

[0022] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] The invention provides a zinc-based welding wire for copper-aluminum arc welding, comprising a flux core and a welding skin, 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 rest is Zn powder.

[0024] The roles and functions of the main components of the above welding wire are as follows: (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 a 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 compounds 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 welding wire is used to prepare the transition layer on the copper side, the melting amount of copper itself is less, so the Cu element content in the transition layer is low, and the content of the formed intermetallic compounds is also low.

[0025] (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 elements, the above eutectic phase will be dispersed in the Zn solid solution and have good toughness. In addition, during welding, liquid Sn and Cu will react at temperatures below 415°C to form a solid-liquid isomeric compound, which can promote the spreading and flow of the molten pool on the aluminum surface.

[0026] (3) Bi is added to the welding wire: According to the Cu-Bi binary phase diagram, the two will not form a brittle phase. According to the Al-Bi binary phase diagram, the two will not form a brittle phase. According to the Bi-Sn binary phase diagram, the two can form a eutectic phase. Therefore, the addition of Bi can effectively reduce the melting point of the welding wire, thereby reducing the melting of aluminum and copper base materials.

[0027] (4) In is added to the welding wire: In has a 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. From the Cu-In binary phase diagram, it can be seen that the mutual solid solubility of the two is relatively large.

[0028] (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 solid-dissolved. Therefore, adding Ag to the welding wire can promote the metallurgical bonding between the transition layer and the copper side on the one hand, and promote the high-quality bonding of copper and aluminum on the other hand.

[0029] (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 can remove the oxide film on the Al side, thereby ensuring the fluidity and spreadability of the molten pool metal.

[0030] The purity of each drug core powder is ≥99.9%; the particle size of each drug core powder is 100~200 mesh.

[0031] The welding skin is Zn strip with a thickness of 0.4mm and a width of 7mm.

[0032] The filling amount of the flux core powder in the flux cored welding wire is controlled at 30wt%~33wt%.

[0033] The present invention also provides a method for preparing a zinc-based welding wire for copper-aluminum arc welding, and 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; In step 1, the purity of each drug core powder is ≥99.9%; the particle size of each drug core powder is 100 mesh to 200 mesh.

[0034] 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 1h to 2h to remove the crystal water in the powders; place the dried powders in a powder mixer and mix them thoroughly for 30min to 40min; Step 3: Use alcohol to remove grease from the surface of the Zn strip, and wrap the mixed powder prepared in step 2 in the Zn steel strip through a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm; In step 3, the Zn strip is a soldering sheet with a thickness of 0.4 mm and a width of 7 mm.

[0035] In step 3, the filling amount of the flux core powder in the flux cored welding wire is controlled to be 30wt% to 33wt%.

[0036] Step 4: After the first drawing process is completed, the die aperture is reduced successively, and finally a flux-cored welding wire with a diameter of 1.2 mm is obtained; Step 5: After the flux-cored welding wire is drawn, it is wound on the welding wire reel by a wire winding machine and finally sealed in a flux-cored welding wire vacuum packaging bag for standby use.

[0037] The method for connecting copper-aluminum dissimilar plates using the zinc-based welding wire of the present invention comprises the following specific steps (eg Figure 1 shown): (1) First, the welding wire of the present invention is selected to prepare a transition layer on the copper side, wherein the thickness of the transition layer is 1.5 mm to 2.0 mm and the welding current is 120 A to 150 A; (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.

[0038] Example 1 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%.

[0039] 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.

[0040] 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; Step 3: Use alcohol to remove grease from the surface of the Zn strip, and wrap the powder prepared in step 2 in the Zn steel strip through a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm; In step 3, the Zn strip is a soldering sheet with a thickness of 0.4 mm and a width of 7 mm.

[0041] In step 3, the filling amount of the flux core powder in the flux cored welding wire is controlled at 30wt%.

[0042] Step 4: After the first drawing process is completed, the die aperture is reduced successively, and finally a flux-cored welding wire with a diameter of 1.2 mm is obtained.

[0043] Step 5: After the flux-cored welding wire is drawn, it is wound on the welding wire reel by a wire winding machine and finally sealed in a flux-cored welding wire vacuum packaging bag for standby use.

[0044] The method for connecting copper-aluminum dissimilar plates using the welding wire prepared in Example 1 is as follows ( Figure 1 shown): (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 120-150 A; (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.

[0045] After testing, the results of copper-aluminum dissimilar joints are as follows: (1) There are no cracks or inclusion defects in the joint; (2) The micro-Vickers hardness of the joint is 55HV0.1; (3) The tensile strength of the joint is 80 MPa.

[0046] Example 2 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%.

[0047] 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.

[0048] 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; Step 3: Use alcohol to remove grease from the surface of the Zn strip, and wrap the powder prepared in step 2 in the Zn steel strip through a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm; In step 3, the Zn strip is a soldering sheet with a thickness of 0.4 mm and a width of 7 mm.

[0049] In step 3, the filling amount of the flux core powder in the flux cored welding wire is controlled at 33 wt %.

[0050] Step 4: After the first drawing process is completed, the die aperture is reduced successively, and finally a flux-cored welding wire with a diameter of 1.2 mm is obtained.

[0051] Step 5: After the flux-cored welding wire is drawn, it is wound on the welding wire reel by a wire winding machine and finally sealed in a flux-cored welding wire vacuum packaging bag for standby use.

[0052] The method for connecting copper-aluminum dissimilar plates using the welding wire prepared in Example 2 is as follows ( Figure 1 shown): (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; (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.

[0053] After testing, the results of copper-aluminum dissimilar joints are as follows: (1) There are no cracks or inclusion defects in the joint; (2) The micro-Vickers hardness of the joint is 51HV0.1; (3) The tensile strength of the joint is 78 MPa.

[0054] Figure 2 The microstructure of the copper-aluminum dissimilar material joint prepared in Example 2. As can be seen from the figure, the eutectic phase is distributed on the solid solution phase matrix, and no microscopic defects are found.

[0055] Figure 3 This is the tensile fracture scanning electron microscope morphology of the copper-aluminum dissimilar material joint structure prepared in Example 2. As can be seen from the figure, the fracture surface presents a certain plastic morphology.

[0056] Example 3 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%.

[0057] 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.

[0058] 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; Step 3: Use alcohol to remove grease from the surface of the Zn strip, and wrap the powder prepared in step 2 in the Zn steel strip through a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm; In step 3, the Zn strip is a soldering sheet with a thickness of 0.4 mm and a width of 7 mm.

[0059] In step 3, the filling amount of the flux core powder in the flux cored welding wire is controlled at 31 wt %.

[0060] Step 4: After the first drawing process is completed, the die aperture is reduced successively, and finally a flux-cored welding wire with a diameter of 1.2 mm is obtained.

[0061] Step 5: After the flux-cored welding wire is drawn, it is wound on the welding wire reel by a wire winding machine and finally sealed in a flux-cored welding wire vacuum packaging bag for standby use.

[0062] 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 (eg Figure 1 shown): (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; (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.

[0063] After testing, the results of copper-aluminum dissimilar joints are as follows: (1) There are no cracks or inclusion defects in the joint; (2) The micro-Vickers hardness of the joint is 59HV0.1; (3) The tensile strength of the joint is 82 MPa.

[0064] Example 4 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%.

[0065] 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.

[0066] 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; place the dried powders in a powder mixer and mix them thoroughly for 39 minutes; Step 3: Use alcohol to remove grease from the surface of the Zn strip, and wrap the powder prepared in step 2 in the Zn steel strip through a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm; In step 3, the Zn strip is a soldering sheet with a thickness of 0.4 mm and a width of 7 mm.

[0067] In step 3, the filling amount of the flux core powder in the flux cored welding wire is controlled at 32 wt %.

[0068] Step 4: After the first drawing process is completed, the die aperture is reduced successively, and finally a flux-cored welding wire with a diameter of 1.2 mm is obtained.

[0069] Step 5: After the flux-cored welding wire is drawn, it is wound on the welding wire reel by a wire winding machine and finally sealed in a flux-cored welding wire vacuum packaging bag for standby use.

[0070] The method for connecting copper-aluminum dissimilar plates using the welding wire prepared in Example 4 is as follows ( Figure 1 shown): (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 120-150 A; (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.

[0071] After testing, the results of copper-aluminum dissimilar joints are as follows: (1) There are no cracks or inclusion defects in the joint; (2) The micro-Vickers hardness of the joint is 56HV0.1; (3) The tensile strength of the joint is 83 MPa.

[0072] Example 5 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%.

[0073] 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.

[0074] 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; place the dried powders in a powder mixer and mix them thoroughly for 32 minutes; Step 3: Use alcohol to remove grease from the surface of the Zn strip, and wrap the powder prepared in step 2 in the Zn steel strip through a flux-cored wire drawing device. The aperture of the first drawing die is 2.6 mm; In step 3, the Zn strip is a soldering sheet with a thickness of 0.4 mm and a width of 7 mm.

[0075] In step 3, the filling amount of the flux core powder in the flux cored welding wire is controlled at 30wt%.

[0076] Step 4: After the first drawing process is completed, the die aperture is reduced successively, and finally a flux-cored welding wire with a diameter of 1.2 mm is obtained.

[0077] Step 5: After the flux-cored welding wire is drawn, it is wound on the welding wire reel by a wire winding machine and finally sealed in a flux-cored welding wire vacuum packaging bag for standby use.

[0078] The method for connecting copper-aluminum dissimilar plates using the welding wire prepared in Example 5 is as follows ( Figure 1 shown): (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 120-150 A; (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.

[0079] After testing, the results of copper-aluminum dissimilar joints are as follows: (1) There are no cracks or inclusion defects in the joint; (2) The micro-Vickers hardness of the joint is 57HV0.1; (3) The tensile strength of the joint is 87 MPa.

Claims

1. A zinc-based welding wire for copper-aluminum arc welding, characterized in that: It includes a flux core and a solder coating, wherein the flux core includes 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.

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 zinc-based welding wire for copper-aluminum arc welding according to claim 1, characterized in that: The welding skin is a Zn strip with a thickness of 0.4 mm and a width of 7 mm.

4. The zinc-based welding wire for copper-aluminum arc welding according to claim 1, characterized in that: The filling amount of the flux core powder in the flux cored welding wire is controlled at 30wt%~33wt%.

5. A method for preparing a zinc-based welding wire for copper-aluminum arc welding, 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 various powders weighed in step 1 in a vacuum heating furnace for heating at a temperature of 100°C to 120°C for a holding time of 1h to 2h; place the dried powders in a powder mixer for sufficient mixing for a mixing time of 30min to 40min; Step 3: Wrap the mixed powder prepared in step 2 in a Zn steel strip through a flux-cored wire drawing device, and 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 successively, and finally a flux-cored welding wire with a diameter of 1.2 mm is obtained; Step 5: After the flux-cored welding wire is drawn, it is wound on the welding wire reel by a wire winding machine and finally sealed in a flux-cored welding wire vacuum packaging bag for standby use.

6. The method for preparing a zinc-based welding wire for copper-aluminum arc welding according to claim 5, characterized in that: In step 1, the purity of each drug core powder is ≥99.9%; the particle size of each drug core powder is 100~200 mesh.

7. The method for preparing a zinc-based welding wire for copper-aluminum arc welding according to claim 5, characterized in that: In step 3, the Zn strip is a soldering sheet with a thickness of 0.4 mm and a width of 7 mm.

8. The method for preparing a zinc-based welding wire for copper-aluminum arc welding according to claim 5, characterized in that: In step 3, the filling amount of the flux core powder in the flux cored welding wire is controlled to be 30wt% to 33wt%.

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