Copper-silver-based welding wire for butt welding of titanium-nickel composite plate and preparation method of copper-silver-based welding wire

Abstract

The invention discloses a copper-silver-based welding wire for butt welding of a titanium-nickel composite board, the copper-silver-based welding wire comprises a flux core and a welding skin, and the flux core comprises the following components in percentage by mass: 20-25% of Cr powder, 20-25% of Mo powder, 10-20% of Co powder, 10-20% of V powder, 1-2% of Y2O3 + CeO2 powder and the balance of Cu powder. The welding wire is specially used for solving the problem of cracking caused by brittle phases during butt welding of titanium-nickel composite plates. The invention further discloses a preparation method of the copper-silver-based welding wire for butt welding of the titanium-nickel composite plate.

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 preparation method of the copper-silver based welding wire for butt welding of titanium-nickel composite plates. Background Art

[0002] The production method of preparing layered metal composite plates by explosive welding technology has been widely used in the industrial field. Explosive welding is a method that uses the detonation pressure of explosives to accelerate the composite plate and then collide with the substrate at high speed, so that the metal plate undergoes plastic deformation, melting and mutual diffusion between metal atoms at the interface to be welded, thereby achieving a strong bond between the same or different metal plates. Explosive welding technology has the significant characteristics of simple process, low production cost, and excellent product performance. It can get rid of the limitation of equipment size and realize the quantitative preparation and production of large-area metal layered composite plates.

[0003] Titanium metal has good strength and toughness, strong corrosion resistance and high stability, but its production cost is high and its internal resistance is large; nickel metal has good mechanical properties and excellent high temperature resistance. Titanium-nickel composite plates have the excellent properties of both. However, from the Ti-Ni binary phase diagram, it can be seen that when the two are fusion-welded, a variety of brittle phases will be generated, thereby deteriorating the 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 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.

[0007] The present invention is also characterized in that: The particle size of each drug powder is 100~200 mesh.

[0008] The purity of each drug powder is ≥99.90%.

[0009] The solder skin is Cu20Ag tape with a thickness of 0.3mm and a width of 7mm.

[0010] The powder filling amount of copper-silver based welding wire is controlled at 20wt%~26wt%.

[0011] The second technical solution adopted by the present invention is: The preparation method of the copper-silver based welding wire for butt welding of titanium-nickel composite plates comprises the following specific steps: 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 for heating at a temperature of 250°C to 300°C for a holding time of 1h to 3h to remove the crystal water in the powder; the dried powder is placed in a powder mixer for sufficient mixing for a mixing time of 1h to 3h; Step 3: Use Cu20Ag tape as welding skin, use alcohol to remove grease on the surface of Cu20Ag tape, and wrap the powder prepared in step 2 in the Cu20Ag tape through flux-cored wire drawing equipment. 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.

[0012] The present invention is also 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%.

[0013] 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 20wt%~26wt%.

[0014] The beneficial effects of the present invention are: (1) The present invention aims at the brittle phase problem that occurs when welding 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 connection of titanium-nickel composite plates.

[0015] (2) The present invention adds Cr, Mo, Co, and V alloy elements to the copper-silver based welding wire, and combines the Ni element that enters from the nickel plate during welding. The designed weld metal is in the category of high entropy alloy. High entropy alloys have the characteristics of stable crystal structure and excellent comprehensive performance.

[0016] (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.

[0017] (4) The weld metal designed by the present invention does not inhibit the generation of Ti-Ni brittle phase, but changes its distribution pattern, so the welding process window is relatively wide and the field applicability is strong. The welding wire is specially used to solve the cracking problem caused by the brittle phase during butt welding of titanium-nickel composite plates.

[0018] (5) The welding wire developed by the method of the present invention has a small number of powder types and is easy to mass produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a microstructure morphology of the copper-silver based weld of the titanium-nickel composite plate butt joint prepared in Example 2 of the present invention; 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

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] The invention provides a copper-silver based welding wire for butt welding of titanium-nickel composite plates, comprising a flux core and a welding skin, wherein the flux core is composed of the following components by mass percentage: 20-25% of Cr powder, 20-25% of Mo powder, 10-20% of Co powder, 10-20% of V powder, 1-2% of Y2O3+CeO2 powder, and the rest is Cu powder, and the sum of the mass percentages of the above components is 100%.

[0022] Among them, the mass ratio of Y2O3 powder to CeO2 powder is arbitrary.

[0023] The particle size of each drug powder is 100~200 mesh.

[0024] The purity of each drug powder is ≥99.90%.

[0025] The solder skin is Cu20Ag tape with a thickness of 0.3mm and a width of 7mm.

[0026] The powder filling amount of copper-silver based welding wire is controlled at 20wt%~26wt%.

[0027] 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: (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 be welded with these two 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.

[0028] (2) Ag element is added to the welding wire (contained in the weld): If Cu is used alone to weld Ti and Ni materials, since Cu-Ti phase will be generated between Cu and Ti, if the Cu element 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. Because Ag and Cu will not generate brittle phases, and Ag-Cu-Ti can generate low melting point eutectics.

[0029] (3) Cr is added to the welding wire: From the Ti-Cr binary phase diagram, it can be seen that at high temperature, when Ti is in a bcc structure, the two can be infinitely solid-soluble; from the Ni-Cr binary phase diagram, it can be seen that the two can be infinitely solid-soluble. Therefore, the addition of Cr can ensure good metallurgical properties with both Ti and Ni. In addition, there will be no brittle phase between Cr and Cu, the main element of the weld, and mainly a Cu-based solid solution will be generated.

[0030] (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.

[0031] (5) Co is added to the welding wire: From the Ti-Co binary phase diagram, it can be seen that Ti and Co will 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 be infinitely solid-soluble and have excellent weldability. Therefore, adding Co to the welding wire can effectively and significantly improve the welding forming and joint performance of the titanium-nickel composite plate.

[0032] (6) V is added to the welding wire: V and Cu will not form a brittle phase, but they will not dissolve into each other. V and Ti have excellent weldability. Therefore, after adding V, it can achieve excellent welding connection with titanium weld.

[0033] (7) Y2O3+CeO2 is added to the welding wire: By adding rare earth oxides, it can be ensured that the rare earth can really act on the weld. Because rare earth elements have strong oxidizing properties, if added as a single substance, 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.

[0034] (8) 10-20% of Cr powder, Mo powder, Co powder and V powder are added to the welding wire of the present invention, and together with the Ni element of the base material, a high entropy alloy system weld is formed, thereby ensuring excellent comprehensive mechanical properties.

[0035] 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: Step 1: Weigh the powders by mass percentage: Cr powder 20-25%, Mo powder 20-25%, Co powder 10-20%, V powder 10-20%, Y2O3+CeO2 powder 1-2%, and the rest is Cu powder. The sum of the mass percentages of the above components is 100%; In step 1, the particle size of each drug powder weighed is 100-200 mesh; the purity of each drug powder is ≥99.90%.

[0036] Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace for heating at a temperature of 250°C to 300°C for a holding time of 1h to 3h to remove the crystal water in the powder; the dried powder is placed in a powder mixer for sufficient mixing for a mixing time of 1h to 3h; Step 3: Use Cu20Ag tape as welding skin, use alcohol to remove grease on the surface of Cu20Ag tape, and wrap the powder prepared in step 2 in the Cu20Ag tape through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6 mm; 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 20wt%~26wt%.

[0037] 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.

[0038] Example 1 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%; Among them, the mass ratio of Y2O3 powder to CeO2 powder is 1:1; The particle size of each drug powder is 100 mesh; The purity of each drug powder is ≥99.90%; Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated at a temperature of 250°C for 1 hour to remove the crystal water in the powder; the dried powder is placed in a powder mixer for sufficient mixing, and the mixing time is 1 hour; Step 3: Use Cu20Ag tape as welding skin, use alcohol to remove grease on the surface of Cu20Ag tape, and wrap the powder prepared in step 2 in the Cu20Ag tape through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6 mm; 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%.

[0039] 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.

[0040] The welding wire of Example 1 was selected for butt welding of titanium-nickel composite plates, the welding current was selected to be 160A, the welding voltage was 12V, the arc was stable during the welding process, the molten pool had good fluidity, and the weld showed no defects such as cracks and pores to the naked eye. After testing, the mechanical properties of the titanium-nickel heterogeneous material joint are shown in Table 1.

[0041] Table 1 Mechanical properties of titanium-nickel dissimilar joints

[0042] Example 2 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%; Among them, the mass ratio of Y2O3 powder to CeO2 powder is 1:2; The particle size of each drug powder is 200 mesh; The purity of each drug powder is ≥99.90%; 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 for sufficient mixing, and the mixing time is 3 hours; Step 3: Use Cu20Ag tape as welding skin, use alcohol to remove grease on the surface of Cu20Ag tape, and wrap the powder prepared in step 2 in the Cu20Ag tape through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6 mm; 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%.

[0043] 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.

[0044] The welding wire of Example 2 was selected for butt welding of titanium-nickel composite plates, the welding current was selected to be 165A, the welding voltage was 12.2V, the arc was stable during the welding process, the molten pool had good fluidity, and the weld showed no defects such as cracks and pores to the naked eye. After testing, the mechanical properties of the titanium-nickel heterogeneous material joint are shown in Table 1.

[0045] Figure 1 This is a microstructure 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 various phases in the weld are evenly distributed, no large area of ​​brittle phase is seen, the weld structure is uniform, and there are no pores or cracks.

[0046] 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 shows that it is mainly composed of dimples, indicating that the titanium-steel dissimilar material joint has good toughness.

[0047] Example 3 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%; Among them, the mass ratio of Y2O3 powder to CeO2 powder is 1:3; The particle size of each drug powder is 100 mesh; The purity of each drug powder is ≥99.90%; Step 2: The powder weighed in step 1 is placed in a vacuum heating furnace and heated at 270°C for 2 hours to remove the crystal water in the powder; the dried powder is placed in a powder mixer for sufficient mixing, and the mixing time is 2 hours; Step 3: Use Cu20Ag tape as welding skin, use alcohol to remove grease on the surface of Cu20Ag tape, and wrap the powder prepared in step 2 in the Cu20Ag tape through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6 mm; 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 %.

[0048] 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.

[0049] The welding wire of Example 3 was selected for butt welding of titanium-nickel composite plates, the welding current was selected to be 170A, the welding voltage was 12.8V, the arc was stable during the welding process, the molten pool had good fluidity, and the weld showed no defects such as cracks and pores to the naked eye. After testing, the mechanical properties of the titanium-nickel heterogeneous material joint are shown in Table 1.

[0050] Example 4 Step 1: Weigh the powders by mass percentage: Cr powder 24%, Mo powder 24%, Co powder 19%, V powder 19%, Y2O3+CeO2 powder 1.9%, and the rest is Cu powder. The sum of the mass percentages of the above components is 100%; Among them, the mass ratio of Y2O3 powder to CeO2 powder is 1:4; The particle size of each drug powder is 200 mesh; The purity of each drug powder is ≥99.90%; Step 2: The powder weighed in step 1 is 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 is placed in a powder mixer for sufficient mixing, and the mixing time is 2.9 hours; Step 3: Use Cu20Ag tape as welding skin, use alcohol to remove grease on the surface of Cu20Ag tape, and wrap the powder prepared in step 2 in the Cu20Ag tape through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6 mm; 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%.

[0051] 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.

[0052] The welding wire of Example 4 was selected for butt welding of titanium-nickel composite plates, the welding current was selected as 169A, the welding voltage was 12.7V, the arc was stable during the welding process, the molten pool had good fluidity, and the weld showed no defects such as cracks and pores to the naked eye. After testing, the mechanical properties of the titanium-nickel heterogeneous material joint are shown in Table 1.

[0053] Example 5 Step 1: Weigh the powders by mass percentage: Cr powder 21%, Mo powder 21%, Co powder 11%, V powder 11%, Y2O3+CeO2 powder 1.2%, and the rest is Cu powder. The sum of the mass percentages of the above components is 100%; Among them, the mass ratio of Y2O3 powder to CeO2 powder is 1:5; The particle size of each drug powder is 200 mesh; The purity of each drug powder is ≥99.90%; Step 2: The powder weighed in step 1 is 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 is placed in a powder mixer for sufficient mixing, and the mixing time is 1.3 hours; Step 3: Use Cu20Ag tape as welding skin, use alcohol to remove grease on the surface of Cu20Ag tape, and wrap the powder prepared in step 2 in the Cu20Ag tape through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6 mm; 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 %.

[0054] 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.

[0055] The welding wire of Example 5 was selected for butt welding of titanium-nickel composite plates, the welding current was selected as 166A, 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 and pores to the naked eye. After testing, the mechanical properties of the titanium-nickel heterogeneous material joint are shown in Table 1.

[0056] Example 6 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%; Among them, the mass ratio of Y2O3 powder to CeO2 powder is 1:5; The particle size of each drug powder is 200 mesh; The purity of each drug powder is ≥99.90%; Step 2: The powder weighed in step 1 is 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 is placed in a powder mixer for sufficient mixing, and the mixing time is 1.3 hours; Step 3: Use Cu20Ag tape as welding skin, use alcohol to remove grease on the surface of Cu20Ag tape, and wrap the powder prepared in step 2 in the Cu20Ag tape through flux-cored wire drawing equipment. The aperture of the first drawing die is 2.6 mm; 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 %.

[0057] 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.

Claims

1. A copper-silver based welding wire for butt welding of titanium-nickel composite plates, characterized in that: It includes a flux core and a welding skin, wherein the flux core is composed of the following components by mass percentage: Cr powder 20-25%, Mo powder 20-25%, Co powder 10-20%, V powder 10-20%, Y2O3+CeO2 powder 1-2%, and the rest is Cu powder.

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 drug 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. The copper-silver based welding wire for butt welding of titanium-nickel composite plates according to claim 1, characterized in that: The soldering tape is a Cu20Ag tape with a thickness of 0.3 mm and a width of 7 mm.

5. The copper-silver based welding wire for butt welding of titanium-nickel composite plates according to claim 1, characterized in that: The powder filling amount of the copper-silver based welding wire is controlled at 20wt%-26wt%.

6. 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 for heating at a temperature of 250°C to 300°C for a holding time of 1h to 3h to remove the crystal water in the powder; the dried powder is placed in a powder mixer for sufficient mixing for a mixing time of 1h to 3h; Step 3: Use Cu20Ag tape as welding skin, use alcohol to remove grease on the surface of Cu20Ag tape, and wrap the powder prepared in step 2 in the Cu20Ag tape through flux-cored wire drawing equipment. 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.

7. The method for preparing the copper-silver based welding wire for butt welding of titanium-nickel composite plates according to claim 6, 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%.

8. The method for preparing the copper-silver based welding wire for butt welding of titanium-nickel composite plates according to claim 6, characterized in that: 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 20wt%~26wt%.

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