Copper-silver based welding wire for butt welding of titanium-nickel composite plates and preparation method thereof

Abstract

The present invention discloses a copper-silver-based welding wire for butt welding titanium-nickel clad plates. The wire comprises a flux core and a welding sheath. The flux core is composed, by mass, of the following components: 20-25% Cr powder, 20-25% Mo powder, 10-20% Co powder, 10-20% V powder, 1-2% Y2O3+CeO2 powder, and the remainder Cu powder. This welding wire is specifically designed to address the cracking problem caused by brittle phases during butt welding of titanium-nickel clad plates. The present invention also discloses a method for preparing the copper-silver-based welding wire for butt welding of titanium-nickel clad plates.

Description

Technical Field

[0001] The invention belongs to the technical field of metal materials, and in particular relates to a copper-silver based welding wire for butt welding of titanium-nickel composite plates. The invention also relates to a method for preparing the copper-silver based welding wire for butt welding of titanium-nickel composite plates. Background Art

[0002] The production of layered metal composite panels using explosive welding technology has gained widespread industrial application. Explosive welding utilizes the explosive pressure to accelerate the composite panels, causing them to collide with the substrate at high speed. This causes plastic deformation, melting, and interdiffusion of metal atoms at the interface to be welded, thereby achieving a strong bond between homogeneous or dissimilar metal sheets. Explosive welding technology offers significant advantages, including simple process, low production costs, and excellent product performance. It overcomes the limitations of equipment size and enables the mass production of large-scale metal composite panels.

[0003] Titanium offers excellent strength, toughness, corrosion resistance, and stability, but its production cost is high and its internal resistance is high. Nickel, on the other hand, offers excellent mechanical properties and high-temperature resistance. Titanium-nickel composite plates combine the advantages of both. However, as the Ti-Ni binary phase diagram shows, fusion welding of the two produces various brittle phases, which degrades joint performance. Summary of the Invention

[0004] The purpose of the present invention is to provide a copper-silver based welding wire for butt welding of titanium-nickel composite plates, which is specially used to solve the cracking problem caused by the brittle phase during butt welding of titanium-nickel composite plates.

[0005] The second object of the present invention is to provide a method for preparing a copper-silver based welding wire for butt welding of titanium-nickel composite plates.

[0006] The first technical solution adopted by the present invention is a copper-silver-based welding wire for butt welding of titanium-nickel composite plates, comprising a flux core and a welding cover, wherein the flux core is composed of the following components by mass percentage: 20-25% Cr powder, 20-25% Mo powder, 10-20% Co powder, 10-20% V powder, 1-2% Y2O3+CeO2 powder, and the rest is Cu powder.

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

[0008] The particle size of each powder is 100~200 mesh.

[0009] The purity of each drug powder is ≥99.90%.

[0010] The solder paste is Cu20Ag tape with a thickness of 0.3mm and a width of 7mm.

[0011] The powder filling amount of copper-silver based welding wire is controlled at 20wt%~26wt%.

[0012] The second technical solution adopted by the present invention is:

[0013] The preparation method of copper-silver based welding wire for butt welding of titanium-nickel composite plates comprises the following specific steps:

[0014] Step 1: Weigh the powders by mass percentage: 20-25% Cr powder, 20-25% Mo powder, 10-20% Co powder, 10-20% V powder, 1-2% Y2O3+CeO2 powder, and the rest is Cu powder;

[0015] Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated at a temperature of 250°C to 300°C for 1 hour to 3 hours to remove the crystal water in the powder; the dried powder is placed in a powder mixer and fully mixed for 1 hour to 3 hours;

[0016] Step 3: Use Cu20Ag strip as welding skin, remove grease from the surface of Cu20Ag strip with alcohol, and wrap the powder prepared in step 2 inside the Cu20Ag strip through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6mm.

[0017] 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;

[0018] 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.

[0019] The present invention is also characterized in that:

[0020] In step 1, the particle size of each drug powder weighed is 100-200 mesh; the purity of each drug powder is ≥99.90%.

[0021] In step 3, the thickness of the Cu20Ag strip is 0.3 mm and the width is 7 mm; the powder filling amount of the copper-silver based welding wire is controlled at 20 wt% to 26 wt%.

[0022] The beneficial effects of the present invention are:

[0023] (1) The present invention addresses the brittle phase problem that occurs during welding of titanium-nickel composite plates. From the perspective of Ti and Ni metal welding metallurgy, a copper-silver based welding wire is developed to ensure high-quality welding connections of titanium-nickel composite plates.

[0024] (2) The present invention adds Cr, Mo, Co, and V alloy elements to the copper-silver-based welding wire, and combines this with the Ni element that enters from the nickel plate during welding. The resulting weld metal falls within the realm of high-entropy alloys. High-entropy alloys have the characteristics of a stable crystal structure and excellent overall performance.

[0025] (3) The weld metal formed by the welding wire designed in the present invention is mainly composed of Cu-Cr-Ni-Mo solid solution phase, which has good toughness. The Ti-Ni brittle phase generated in the weld will be dispersed in the above-mentioned solid solution matrix, so that the entire weld has excellent strength and toughness.

[0026] (4) The weld metal designed in this invention does not suppress the formation of Ti-Ni brittle phase, but rather changes its distribution pattern, resulting in a wide welding process window and strong field applicability. This welding wire is specifically designed to address the cracking problem caused by the brittle phase during butt welding of titanium-nickel composite plates.

[0027] (5) The welding wire developed by the method of the present invention has fewer types of powder and is convenient for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a microstructural morphology of the copper-silver based weld of the titanium-nickel composite plate butt joint prepared in Example 2 of the present invention;

[0029] Figure 2 This is the tensile fracture morphology of the copper-silver based weld of the titanium-nickel composite plate butt joint prepared in Example 2 of the present invention. 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 copper-silver-based welding wire for butt welding of titanium-nickel composite plates, comprising a flux core and a welding cover, wherein the flux core is composed of the following components by mass percentage: 20-25% Cr powder, 20-25% Mo powder, 10-20% Co powder, 10-20% V powder, 1-2% Y2O3+CeO2 powder, and the remainder is Cu powder, and the sum of the mass percentages of the above components is 100%.

[0032] The mass ratio of Y2O3 powder to CeO2 powder is arbitrary.

[0033] The particle size of each powder is 100~200 mesh.

[0034] The purity of each drug powder is ≥99.90%.

[0035] The solder paste is Cu20Ag tape with a thickness of 0.3mm and a width of 7mm.

[0036] The powder filling amount of copper-silver based welding wire is controlled at 20wt%~26wt%.

[0037] The roles and functions of the main alloy components in the above-mentioned copper-silver based welding wire for butt welding of titanium-nickel composite plates are as follows:

[0038] (1) The main element in the welding wire is Cu: The base materials of the composite plate to be welded are titanium and nickel, and the main elements are Ti and Ni. Therefore, when selecting welding materials, it is necessary to consider elements that can weld well with both elements at the same time. According to the Ti-Cu and Ni-Cu binary phase diagrams, Cu has good welding properties with both Ti and Ni. Therefore, choosing a welding wire with Cu as the main component can ensure the welding connection of the titanium-nickel composite plate.

[0039] (2) Ag is added to the welding wire (contained in the weld): If Cu is used alone to weld Ti and Ni materials, a Cu-Ti phase will form between Cu and Ti. Therefore, if the Cu content in the weld is too high, the Cu-Ti phase content in the weld will be very high. Although its brittleness is lower than that of the Ti-Ni phase, when it is distributed on a large scale, the joint toughness is poor. In addition, if too much Ti or Ni melts into the weld during welding, more Ti-Ni brittle phase will be generated. Based on the above two elements, other low-melting-point elements must be added, and Ag is the first choice. This is because Ag and Cu do not form brittle phases, and Ag-Cu-Ti can form a low-melting-point eutectic.

[0040] (3) Cr is added to the welding wire: The Ti-Cr binary phase diagram shows that at high temperatures, when Ti is in a bcc structure, the two can be infinitely dissolved; the Ni-Cr binary phase diagram shows that the two can be infinitely dissolved. Therefore, the addition of Cr can ensure good metallurgical properties with both Ti and Ni. Furthermore, no brittle phase will form between Cr and Cu, the main element of the weld, and a Cu-based solid solution will be formed.

[0041] (4) Mo is added to the welding wire: Mo is an important solid solution strengthening element for Ni-based alloys. There is a certain solid solubility between Mo and Ti. The addition of Mo can improve the strength of the copper-silver weld.

[0042] (5) Co is added to the welding wire: From the Ti-Co binary phase diagram, it can be seen that Ti and Co form a limited solid solution, indicating that welding is possible; from the Ni-Co binary phase diagram, it can be seen that Co and Ni can form an infinite solid solution, indicating excellent weldability. Therefore, the addition of Co to the welding wire can effectively and significantly improve the welding forming and joint performance of the titanium-nickel composite plate.

[0043] (6) V is added to the welding wire: V and Cu do not form a brittle phase, but they do not dissolve into each other. V and Ti have excellent weldability. Therefore, the addition of V can achieve an excellent weld connection with the titanium weld.

[0044] (7) Y2O3 + CeO2 are added to the welding wire: By adding rare earth oxides, it is possible to ensure that the rare earth elements can truly act on the weld. Because rare earth elements have strong oxidizing properties, if added as a single element, they are easily oxidized into slag and float on the surface of the molten pool. By adding mixed rare earth oxides, the limitations of a single rare earth element in purifying grain boundaries and strengthening grain boundary bonding can be overcome.

[0045] (8) 10-20% of Cr powder, Mo powder, Co powder and V powder are added to the welding wire of the present invention, and combined with the Ni element of the base material, a high entropy alloy system weld is formed, which ensures excellent comprehensive mechanical properties.

[0046] The present invention also provides a method for preparing a copper-silver based welding wire for butt welding of titanium-nickel composite plates, the specific steps of which are as follows:

[0047] Step 1: Weigh the powders by mass percentage: 20-25% Cr powder, 20-25% Mo powder, 10-20% Co powder, 10-20% V powder, 1-2% Y2O3+CeO2 powder, and the rest is Cu powder. The sum of the mass percentages of the above components is 100%;

[0048] In step 1, the particle size of each drug powder weighed is 100-200 mesh; the purity of each drug powder is ≥99.90%.

[0049] Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated at a temperature of 250°C to 300°C for 1 hour to 3 hours to remove the crystal water in the powder; the dried powder is placed in a powder mixer and fully mixed for 1 hour to 3 hours;

[0050] Step 3: Use Cu20Ag strip as welding skin, remove grease from the surface of Cu20Ag strip with alcohol, and wrap the powder prepared in step 2 inside the Cu20Ag strip through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6mm.

[0051] In step 3, the thickness of the Cu20Ag strip is 0.3 mm and the width is 7 mm; the powder filling amount of the copper-silver based welding wire is controlled at 20 wt% to 26 wt%.

[0052] 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;

[0053] 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.

[0054] Example 1

[0055] Step 1: Weigh the powders by mass percentage: 20% Cr powder, 20% Mo powder, 10% Co powder, 10% V powder, 1% Y2O3+CeO2 powder, and the rest is Cu powder. The sum of the mass percentages of the above components is 100%;

[0056] Among them, the mass ratio of Y2O3 powder to CeO2 powder is 1:1;

[0057] The particle size of each drug powder is 100 mesh;

[0058] The purity of each drug powder is ≥99.90%;

[0059] Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated at 250°C for 1 hour to remove the crystal water in the powder; the dried powder is placed in a powder mixer and fully mixed for 1 hour;

[0060] Step 3: Use Cu20Ag strip as welding skin, remove grease from the surface of Cu20Ag strip with alcohol, and wrap the powder prepared in step 2 inside the Cu20Ag strip through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6mm.

[0061] In step 3, the thickness of the Cu20Ag strip is 0.3 mm and the width is 7 mm; the powder filling amount of the copper-silver based welding wire is controlled at 20 wt%.

[0062] 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;

[0063] 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.

[0064] The welding wire of Example 1 was used for butt welding of titanium-nickel composite plates. The welding current was 160A and the welding voltage was 12V. The arc was stable, the molten pool had good fluidity, and the weld seam showed no defects such as cracks or pores. The mechanical properties of the titanium-nickel heterogeneous material joints are shown in Table 1.

[0065] Table 1 Mechanical properties of titanium-nickel dissimilar joints

[0066]

[0067] Example 2

[0068] Step 1: Weigh the powders by mass percentage: 25% Cr powder, 25% Mo powder, 20% Co powder, 20% V powder, 2% Y2O3+CeO2 powder, and the rest is Cu powder. The sum of the mass percentages of the above components is 100%;

[0069] Among them, the mass ratio of Y2O3 powder to CeO2 powder is 1:2;

[0070] The particle size of each powder is 200 mesh;

[0071] The purity of each drug powder is ≥99.90%;

[0072] Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated at 300°C for 3 hours to remove the crystal water in the powder; the dried powder is placed in a powder mixer and fully mixed for 3 hours;

[0073] Step 3: Use Cu20Ag strip as welding skin, remove grease from the surface of Cu20Ag strip with alcohol, and wrap the powder prepared in step 2 inside the Cu20Ag strip through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6mm.

[0074] In step 3, the thickness of the Cu20Ag strip is 0.3 mm and the width is 7 mm; the powder filling amount of the copper-silver based welding wire is controlled at 24 wt%.

[0075] 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;

[0076] 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.

[0077] The welding wire of Example 2 was used for butt welding of titanium-nickel composite plates. The welding current was 165A and the welding voltage was 12.2V. The arc was stable, the molten pool had good fluidity, and the weld seam showed no defects such as cracks or pores. The mechanical properties of the titanium-nickel heterogeneous material joints are shown in Table 1.

[0078] Figure 1 This is a microstructure morphology of the copper-silver-based weld seam of a titanium-nickel composite plate butt joint prepared in Example 2 of the present invention. As can be seen from the figure, the various phases in the weld are evenly distributed, with no large areas of brittle phases. The weld structure is uniform and free of pores and cracks.

[0079] Figure 2 This is the tensile fracture morphology of the copper-silver-based weld of the titanium-nickel composite plate butt joint prepared in Example 2 of the present invention. As can be seen from the figure, the fracture surface is mainly composed of dimples, indicating that the titanium-steel dissimilar material joint has good toughness.

[0080] Example 3

[0081] Step 1: Weigh the powders by mass percentage: 23% Cr powder, 23% Mo powder, 15% Co powder, 15% V powder, 1.5% Y2O3+CeO2 powder, and the rest is Cu powder. The sum of the mass percentages of the above components is 100%;

[0082] Among them, the mass ratio of Y2O3 powder to CeO2 powder is 1:3;

[0083] The particle size of each drug powder is 100 mesh;

[0084] The purity of each drug powder is ≥99.90%;

[0085] Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated at a temperature of 270°C for 2 hours to remove the crystal water in the powder; the dried powder is placed in a powder mixer and fully mixed for 2 hours;

[0086] Step 3: Use Cu20Ag strip as welding skin, remove grease from the surface of Cu20Ag strip with alcohol, and wrap the powder prepared in step 2 inside the Cu20Ag strip through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6mm.

[0087] In step 3, the thickness of the Cu20Ag strip is 0.3 mm and the width is 7 mm; the powder filling amount of the copper-silver based welding wire is controlled at 26 wt%.

[0088] 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;

[0089] 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.

[0090] The welding wire of Example 3 was used for butt welding of titanium-nickel composite plates. The welding current was 170A and the welding voltage was 12.8V. The arc was stable, the molten pool had good fluidity, and the weld seam showed no defects such as cracks or pores. The mechanical properties of the titanium-nickel dissimilar material joints were tested and are shown in Table 1.

[0091] Example 4

[0092] Step 1: Weigh the powders by mass percentage: 24% Cr powder, 24% Mo powder, 19% Co powder, 19% V powder, 1.9% Y2O3+CeO2 powder, and the rest is Cu powder. The sum of the mass percentages of the above components is 100%;

[0093] Among them, the mass ratio of Y2O3 powder to CeO2 powder is 1:4;

[0094] The particle size of each powder is 200 mesh;

[0095] The purity of each drug powder is ≥99.90%;

[0096] Step 2: The powder weighed in step 1 was placed in a vacuum heating furnace and heated at 290°C for 2.8 hours to remove the crystal water in the powder; the dried powder was placed in a powder mixer and fully mixed for 2.9 hours;

[0097] Step 3: Use Cu20Ag strip as welding skin, remove grease from the surface of Cu20Ag strip with alcohol, and wrap the powder prepared in step 2 inside the Cu20Ag strip through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6mm.

[0098] In step 3, the thickness of the Cu20Ag strip is 0.3 mm and the width is 7 mm; the powder filling amount of the copper-silver based welding wire is controlled at 25 wt%.

[0099] 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;

[0100] 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.

[0101] The welding wire of Example 4 was used for butt welding of titanium-nickel composite plates. The welding current was 169A and the welding voltage was 12.7V. The arc was stable during the welding process, the molten pool had good fluidity, and the weld seam showed no defects such as cracks or pores. The mechanical properties of the titanium-nickel heterogeneous material joint are shown in Table 1.

[0102] Example 5

[0103] Step 1: Weigh the powders by mass percentage: 21% Cr powder, 21% Mo powder, 11% Co powder, 11% V powder, 1.2% Y2O3+CeO2 powder, and the rest is Cu powder. The sum of the mass percentages of the above components is 100%;

[0104] Among them, the mass ratio of Y2O3 powder to CeO2 powder is 1:5;

[0105] The particle size of each powder is 200 mesh;

[0106] The purity of each drug powder is ≥99.90%;

[0107] Step 2: The powder weighed in step 1 was placed in a vacuum heating furnace and heated at a temperature of 255°C for 1.3 hours to remove the crystal water in the powder; the dried powder was placed in a powder mixer and fully mixed for 1.3 hours;

[0108] Step 3: Use Cu20Ag strip as welding skin, remove grease from the surface of Cu20Ag strip with alcohol, and wrap the powder prepared in step 2 inside the Cu20Ag strip through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6mm.

[0109] In step 3, the thickness of the Cu20Ag strip is 0.3 mm and the width is 7 mm; the powder filling amount of the copper-silver based welding wire is controlled at 26 wt%.

[0110] 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;

[0111] 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.

[0112] The welding wire of Example 5 was used for butt welding of titanium-nickel composite plates. The welding current was 166A and the welding voltage was 12.3V. The arc was stable during the welding process, the molten pool had good fluidity, and the weld showed no defects such as cracks or pores to the naked eye. The mechanical properties of the titanium-nickel dissimilar material joints are shown in Table 1.

[0113] Example 6

[0114] Step 1: Weigh the powders by mass percentage: Cr powder 21%, Mo powder 21%, Co powder 11%, V powder 11%, Y2O3+CeO2 powder 2%, and the rest is Cu powder. The sum of the mass percentages of the above components is 100%;

[0115] Among them, the mass ratio of Y2O3 powder to CeO2 powder is 1:5;

[0116] The particle size of each powder is 200 mesh;

[0117] The purity of each drug powder is ≥99.90%;

[0118] Step 2: The powder weighed in step 1 was placed in a vacuum heating furnace and heated at a temperature of 255°C for 1.3 hours to remove the crystal water in the powder; the dried powder was placed in a powder mixer and fully mixed for 1.3 hours;

[0119] Step 3: Use Cu20Ag strip as welding skin, remove grease from the surface of Cu20Ag strip with alcohol, and wrap the powder prepared in step 2 inside the Cu20Ag strip through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6mm.

[0120] In step 3, the thickness of the Cu20Ag strip is 0.3 mm and the width is 7 mm; the powder filling amount of the copper-silver based welding wire is controlled at 26 wt%.

[0121] 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;

[0122] 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.

Claims

1. Copper-silver based welding wire for butt welding of titanium-nickel composite plates, characterized in that: The flux core comprises a flux core and a welding skin, wherein the flux core is composed of the following components by mass percentage: 20-25% Cr powder, 20-25% Mo powder, 10-20% Co powder, 10-20% V powder, 1-2% Y2O3+CeO2 powder, and the rest is Cu powder; The solder paste is a Cu20Ag strip with a thickness of 0.3 mm and a width of 7 mm; The powder filling amount of the copper-silver based welding wire is controlled to be 20wt%-26wt%.

2. The copper-silver based welding wire for butt welding of titanium-nickel composite plates according to claim 1, characterized in that: The particle size of each powder is 100~200 mesh.

3. The copper-silver based welding wire for butt welding of titanium-nickel composite plates according to claim 1, characterized in that: The purity of each drug powder is ≥99.90%.

4. A method for preparing a copper-silver based welding wire for butt welding of titanium-nickel composite plates, characterized in that: The specific steps are as follows: Step 1: Weigh the powders by mass percentage: 20-25% Cr powder, 20-25% Mo powder, 10-20% Co powder, 10-20% V powder, 1-2% Y2O3+CeO2 powder, and the rest is Cu powder; Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated at a temperature of 250°C to 300°C for 1 hour to 3 hours to remove the crystal water in the powder; the dried powder is placed in a powder mixer and fully mixed for 1 hour to 3 hours; Step 3: Use a Cu20Ag strip as the solder wrapper. Use alcohol to remove grease from the surface of the Cu20Ag strip. Then, wrap the powder prepared in Step 2 inside the Cu20Ag strip using a flux-cored wire drawing machine. The aperture of the first drawing die is 2.6 mm. In Step 3, the Cu20Ag strip is 0.3 mm thick and 7 mm wide. The powder filling amount of the copper-silver-based welding wire is controlled at 20 wt% to 26 wt%. 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.

5. The method for preparing a copper-silver based welding wire for butt welding of titanium-nickel composite plates according to claim 4, characterized in that: In step 1, the particle size of each drug powder weighed is 100-200 mesh; the purity of each drug powder is ≥99.90%.

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