Preparation method of high-precision and high-performance titanium alloy welding wire and welding wire

Abstract

The invention relates to a preparation method of a high-precision and high-performance titanium alloy welding wire. The preparation method at least comprises the following steps: S1, preparing a wire blank, wherein the wire blank comprises the following components in percentage by mass: 5.85-6.45% of Al; v: 3.95% to 4.35%; o: < = 0.2%; fe: less than or equal to 0.2%; and the balance of Ti. S2, rolling is conducted, specifically, the wire rod blank containing the components is rolled into a wire material; a surface oxide layer and impurities are removed through a peeling mold, the surface quality is improved, and it is guaranteed that the roundness of the wire is smaller than or equal to 0.01 mm; s4, polishing is conducted, specifically, the wire is subjected to polishing treatment, so that the surface roughness of the wire is smaller than or equal to Ra 0.5 micron; and S5, annealing treatment is conducted, specifically, the polished wire is subjected to annealing treatment, during annealing, the front-back tension of the wire is adjusted and controlled to be 500-750 N through a tension swing take-up and pay-off device, the annealing temperature is 750-800 DEG C, the online annealing time is 15 min, internal stress of the material is removed, the material strength is reduced, and a finished wire product with the material strength of 280-340 HV and the straightness smaller than or equal to 0.3 mm is prepared.

Description

Technical Field

[0001] The invention relates to the technical field of titanium alloy manufacturing, and in particular to a preparation method and welding wire of a high-precision and high-performance titanium alloy welding wire. Background Art

[0002] With the rapid development of smart wearable devices, high-end smart products such as watches and mobile phones have increasingly stringent requirements for welding materials. When applied to such precision electronic products, traditional welding materials are often difficult to meet their comprehensive requirements for strength, corrosion resistance and welding quality. As a high-performance alloy, Ti-6Al-4V titanium alloy has become the preferred welding material for high-end electronic products due to its high strength, low density, excellent corrosion resistance and good welding performance. However, it is a challenging technical task to accurately process Ti-6Al-4V high-precision and high-performance titanium alloy welding wire to a diameter of 1.2mm and ensure that the surface of the welding wire is bright and defect-free to meet the welding needs of high-end electronic products. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects in the prior art and provide a preparation method and welding wire of a high-precision and high-performance titanium alloy welding wire.

[0004] To achieve the above object, the technical solution of the present invention is to design a method for preparing a high-precision and high-performance titanium alloy welding wire, which is characterized by comprising at least the following steps: S1. Prepare the wire blank: the composition mass percentage of the wire blank is: Al: 5.85%~6.45%; V: 3.95%~4.35%; O: ≤0.2%; Fe: ≤0.2%; the rest is Ti; S2 rolling: rolling the wire billet with the above composition into wire; S3 peeling: removing the surface oxide layer and impurities through the peeling die, improving the surface quality, and ensuring that the roundness of the wire reaches ≤0.01mm; S4 polishing: polishing the wire material so that the surface roughness of the wire material reaches ≤Ra0.5μm; S5 annealing treatment: annealing treatment is performed on the polished wire. During annealing, the front and rear tensions of the wire are adjusted and controlled to be 500-750N through the tension swing wire-retracting device. The annealing temperature is 750-800°C and the online annealing time is 15min. The internal stress of the material is removed and the material strength is reduced to prepare the finished wire with a material strength of 280-340HV and a straightness of ≤0.3mm.

[0005] According to a further preferred technical solution, in step S1, the wire rod blank contains one or more of the following components in a mass percentage: C: ≤0.03%; N: ≤0.02%; H: ≤0.015%.

[0006] According to a further preferred technical solution, in step S1, the wire billet is prepared into a wire billet with a diameter of 5 mm.

[0007] According to a further preferred technical solution, in step S2, the titanium alloy wire billet is continuously rolled 1 to 17 times to form the titanium alloy wire; the single-pass compression rate of the rolling is controlled to be 10 to 20%, and the rolling speed is 25 to 40 m / min.

[0008] A further preferred technical solution is to roll the titanium alloy wire billet through four rollers for 10 consecutive times, so that the diameter of the titanium alloy wire billet is rolled from 5.0 mm to 1.65 mm, the diameter accuracy is controlled to be 0.02 mm, and the roundness is 0.03 mm; the titanium alloy wire billet is further rolled through two rollers for 7 consecutive times, so that the diameter of the titanium alloy wire billet is rolled from 1.65 mm to 1.26 mm, the diameter accuracy is controlled to be 0.01 mm, and the roundness is 0.015 mm.

[0009] A further preferred technical solution is that the four rollers include two groups of rollers, each group of rollers is composed of four rollers crossed in a cross shape, and an arc-shaped rolling surface matching the rolling diameter is opened on the outer circumference of each roller, and the two groups of rollers are arranged front and back and cross-arranged at 45 degrees; The two-roller rolling element comprises a group of rollers, each group of rollers is composed of four rollers crossed in a cross shape, and an arc-shaped rolling surface matching the rolling diameter is provided on the outer circumference of each roller. Several groups of two-roller rolling elements are arranged front and back and crossed at 15 degrees.

[0010] According to a further preferred technical solution, in step S3, the titanium alloy wire is passed through two stripping dies in sequence to remove surface material, ensuring a roundness of 0.01 mm and a diameter accuracy of 0.01 mm, and a stripping speed of 15-25 m / min.

[0011] According to a further preferred technical solution, in step S4, the titanium alloy wire is polished by a combination of several groups of 600-mesh abrasive belts and several groups of 1000-mesh abrasive belts to ensure a smooth surface and achieve a surface roughness of ≤Ra0.5μm.

[0012] According to a further preferred technical solution, each group of sanding belts includes at least two sanding belts, and the two sanding belts are arranged front and back and in a cross-arrangement.

[0013] A high-precision and high-performance titanium alloy welding wire is prepared by any one of the above-mentioned preparation methods of high-precision and high-performance titanium alloy welding wire.

[0014] The advantages and beneficial effects of the present invention are as follows: the heat treatment process, cold drawing, peeling, polishing and other technologies of high-precision and high-performance titanium alloy welding wire are controlled and studied, so that the dimensional accuracy of the high-precision and high-performance titanium alloy welding wire is higher, reaching ±0.01mm; through the polishing process, the surface roughness of the high-precision and high-performance titanium alloy welding wire is made to be within Ra0.5, and the surface is free of dirt; by optimizing the annealing parameters of the high-precision and high-performance titanium alloy welding wire, the ductility of the high-precision and high-performance titanium alloy wire is improved, the internal stress of the material itself is eliminated, and the straightness requirement of the product is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a flow chart of the present invention; Figure 2 It is a schematic diagram of four rollers of the present invention; Figure 3 It is a schematic diagram of the abrasive belt of the present invention; Figure 4 It is a schematic diagram of the tension swing wire-retracting and paying-off device of the present invention; Figure 5 It is a partial schematic diagram of the tension swing wire-taking and paying-off device of the present invention.

[0016] In the figure: 10, four rollers; 11, rollers; 20, telescopic seat; 30, tension swing wire-taking and pay-off device; 31, annealing furnace; 32, winder; 33, front guide wheel; 34, guide wheel; 35, rear guide wheel; 36, lever guide wheel; 361, slider; 362, lever guide wheel shaft; 37, lever; 371, fixed shaft; 372, guide groove; 373, tension indicating scale; 38, pay-off machine; 39, counterweight; 391, fastening screw; 40, limiter; 41, adjusting rod. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0018] like Figure 1 As shown, the method for preparing high-precision and high-performance titanium alloy welding wire comprises at least the following steps: S1. Prepare the wire blank: the composition mass percentage of the wire blank is: Al: 5.85%~6.45%; V: 3.95%~4.35%; O: ≤0.2%; Fe: ≤0.2%; the rest is Ti; S2 rolling: rolling the wire billet with the above composition into wire; S3 peeling: removing the surface oxide layer and impurities through the peeling die, improving the surface quality, and ensuring that the roundness of the wire reaches ≤0.01mm; S4 polishing: polishing the wire material so that the surface roughness of the wire material reaches ≤Ra0.5μm; S5 annealing treatment: annealing treatment is performed on the polished wire. During annealing, the front and rear tensions of the wire are adjusted and controlled to be 500-750N through the tension swing wire-retracting device. The annealing temperature is 750-800°C and the online annealing time is 15min. The internal stress of the material is removed and the material strength is reduced to prepare the finished wire with a material strength of 280-340HV and a straightness of ≤0.3mm.

[0019] Preferably, the wire rod blank contains one or more of the following components in mass percentage: C: ≤0.03%; N: ≤0.02%; H: ≤0.015%.

[0020] The geometric tolerances and mechanical properties of the titanium alloy wire, such as roundness, surface roughness, and material strength, are interrelated with the material composition and processing method of the titanium alloy wire, and have cross-effects. For example, with the same polishing method, the surface roughness of the titanium alloy wire will be affected by the titanium alloy material composition and the roundness of the titanium alloy wire before polishing. The higher the roundness of the titanium alloy wire, the higher the quality of the surface roughness after polishing. When the roundness of the titanium alloy wire reaches a certain requirement, the surface roughness is related to the mechanical properties of the titanium alloy wire. When the strength and shaping of the titanium alloy wire are moderate, the quality of the surface roughness of the titanium alloy wire after polishing in the same manner is higher. The roundness of the titanium alloy wire will also be affected in the same way. The same rolling or peeling process may result in different roundness of the titanium alloy wire due to different compositions of the titanium alloy wire. Therefore, the composition of the titanium alloy wire and each step in the preparation method are interrelated and cross-influenced.

[0021] Furthermore, in step S1, the wire billet having the following components by mass percentage: Al: 5.85%~6.45%; V: 3.95%~4.35%; O: ≤0.2%; Fe: ≤0.2%; and the rest being Ti is prepared into a wire billet with a diameter of 5 mm, so as to meet the requirement that the compression amount per pass in the subsequent rolling step is controlled within 10~20%, and the roundness of the wire is ensured to be ≤0.01 mm, and the surface roughness of the wire is ≤Ra0.5 μm.

[0022] Furthermore, in step S2, the titanium alloy wire billet is continuously rolled 1 to 17 times to form the titanium alloy wire; the single-pass compression rate of the rolling is controlled to be 10 to 20%, and the rolling speed is 25 to 40 m / min; Specifically, Figure 2As shown, the titanium alloy wire billet is continuously rolled 10 times through four rollers 10, so that the diameter of the titanium alloy wire billet is rolled from 5.0 mm to 1.65 mm, the diameter accuracy is controlled to be 0.02 mm, the roundness is 0.03 mm, and the true roundness is guaranteed to obtain a titanium alloy wire; the four rollers 10 include two groups of rollers 11, each group of rollers 11 is composed of four rollers 11 in a cross shape, and an arc-shaped rolling surface matching the rolling diameter is opened on the outer circumference of each roller 11. In one embodiment, , two groups of rollers 11 are arranged in a front and back array, and the front and rear rollers 11 have the same structure. The titanium alloy wire is continuously rolled to ensure the compression rate and roundness of each pass. In another embodiment, in order to obtain better roundness, the two groups of rollers 11 are arranged front and back and cross-arranged at 45 degrees. In this way, the rolling joint between two adjacent rollers 11 of the four rollers 10 in the front will be directly rolled by one of the four rollers 10 in the back, which can improve the diameter accuracy and roundness of a single pass.

[0023] The titanium alloy wire billet is rolled 7 times continuously through two rolling rollers, so that the diameter of the titanium alloy wire billet is rolled from 1.65mm to 1.26mm, the diameter accuracy is controlled to be 0.01mm, and the roundness is 0.015mm, so as to ensure the accuracy and uniformity of the diameter. The two rolling rollers include a group of rolling rollers 11, each group of rolling rollers 11 is composed of four rolling rollers crossed in a cross shape, and an arc-shaped rolling surface matching the rolling diameter is provided on the outer periphery of each rolling roller 11. In one embodiment, eight groups of rolling rollers 11 are arranged in a front-to-back array to continuously roll the titanium alloy wire to ensure the compression rate and roundness of each pass. In another embodiment, in order to obtain better roundness, eight groups of rolling rollers 11 are arranged in a front-to-back array and crossed at 15 degrees, so that the rolling joint of two adjacent rolling rollers 11 of the two rolling rollers in the front will be directly rolled by one of the two rolling rollers in the back, so as to improve the diameter accuracy and roundness.

[0024] Further, in step S3, the titanium alloy wire is passed through two peeling dies in sequence to remove the surface material, ensuring the roundness of 0.01mm and the diameter accuracy of 0.01mm, and the peeling speed is 15-25m / min; the titanium alloy wire is passed through a peeling die with a diameter of 1.23±0.01mmmm to remove the residual oxide layer on the surface; and then passed through a peeling die with a diameter of 1.21±0.01mm to remove the surface defects of the material, and then linked with the ultrasonic cleaning equipment, the laser diameter meter controls the diameter size, so as to achieve the dimensional accuracy of this process and the cleanliness of the material, and prepare for the next step of polishing; Furthermore, if Figure 3As shown, in step S4, the titanium alloy wire is polished by combining several groups of 600-mesh abrasive belts 20 and several groups of 1000-mesh abrasive belts 20 to ensure a smooth surface and achieve a surface roughness of ≤Ra0.5μm; specifically, each group of abrasive belts 20 includes at least two abrasive belts 20. In order to obtain better surface roughness, the two abrasive belts 20 are arranged front and back and cross-arranged, so that the two abrasive belts 20 cover the entire outer circumference of the titanium alloy wire to ensure uniform polishing. In a preferred embodiment, the titanium alloy wire is polished by combining four groups of 600-mesh abrasive belts 20 and four groups of 1000-mesh abrasive belts 20. The two adjacent groups of abrasive belts 20 are also cross-arranged, preferably cross-crossed. The titanium alloy wire passes through 8 groups of abrasive belts 20 in sequence, so that the surface roughness of the titanium alloy wire can be ≤0.3μm.

[0025] Further, in step S5, the titanium alloy wire is sequentially passed through several groups of annealing furnaces for online annealing, the annealing temperature is 750-800°C, the annealing speed is 2-3m / min, and the wire is water-cooled; the front and rear tensions of the material are adjusted and controlled by a self-designed tension swing wire-retracting and wire-releasing device. like Figure 4 and Figure 5As shown, the tension swing wire-winding and wire-releasing device 30 includes a winder 32 arranged at the front of the annealing furnace 31, a front guide wheel shaft is arranged at the front end of the winder 32, a front guide wheel 33 is arranged on the front guide wheel shaft, a pair of guide wheels 34 are arranged at the front end of the front guide wheel 33, and a wire-releasing machine 38 is arranged at the rear of the annealing furnace, and a rear guide wheel 35 is arranged at the front end of the wire-releasing machine 38; a fixed shaft 371 and a lever 37 are arranged between the rear guide wheel 35 and the wire-releasing machine 38, the lever 37 is movably connected to the annealing furnace 31 through the fixed shaft 371, and can swing around the fixed shaft 371, and a lever guide wheel shaft 362 is arranged at one end of the lever 37, A lever guide wheel 36 is arranged on the lever guide wheel shaft 362, a counterweight block 39 is arranged at the other end of the lever 37, the counterweight block 39 is movably mounted on the lever 37, and a fastening screw 391 is arranged on the counterweight block 39. Such a design allows easy adjustment and convenient fastening of the counterweight block 39. The method of using the device is as follows: 1. First, install the device at both ends of the annealing furnace 31 before use; 2. Preliminarily adjust the position of the counterweight 39 on the lever 37 by loosening or tightening the fastening screw 391 on the counterweight 39, so that the lever 37 is in a balanced position; 3. Wind the titanium alloy wire around the front guide wheel 33, the lever guide wheel 36, and the rear guide wheel 35; 4. Start the winder 32, and measure the tension of the titanium alloy wire with a handheld tension meter according to the production process requirements of the titanium alloy wire. The position of the counterweight 39 on the lever 37 can be fine-tuned to make the lever 37 in a balanced position; 5. After fine-tuning the position of the counterweight 39 on the lever 37 to make the lever 37 in a balanced position, the automatic adjustment of the tension in the production process of the titanium alloy wire can be achieved by utilizing a simple lever principle.

[0026] Furthermore, in order to achieve online continuous measurement and automatic adjustment of tension, a guide groove 372 is provided on the lever 37 along the entire length direction, and a tension indicating scale 373 is provided on the lever 37 on one side of the guide groove 372. The lever guide wheel 36 is installed on the slider 361 through the wheel axle, and the slider 361 is slidably installed in the guide groove 372 of the lever 37, and the slider 361 can be locked on the lever 37 by a screw. Such a design can intuitively display the position of the lever guide wheel 36 to achieve online continuous and automatic adjustment of tension, and a tension indicating scale 373 is also provided on the lever 37 corresponding to the counterweight block 39, which can intuitively display the screw-in depth of the fastening screw 391 and adjust the distance from the counterweight block 39 to the center of the fixed shaft, so as to facilitate the adjustment of the counterweight and achieve tension adjustment.

[0027] Furthermore, a stopper 40 is provided above the lever 37. The stopper 40 is movably mounted on the bracket of the annealing furnace 31 above the lever 37 through an adjusting rod 41. The stopper 40 is a U-shaped structure, which is buckled above the lever 37, and can prevent the lever guide wheel 36 from being lifted up and causing imbalance under the action of the winder 32. At the same time, the tension mechanism can be kept within a certain range, because the titanium alloy wire passes through the bottom of the lever guide wheel 36 and enters the annealing furnace after passing through the rear guide wheel, so the lever guide wheel 36 is subjected to an upward pulling force, so the stopper 40 is only provided above the lever 37. In order to ensure that the material is heated evenly and has no residual stress during annealing, the material strength is reduced to 280-340HV, and argon gas is added to the furnace at an argon gas flow rate of 15-20NL / min to ensure that no oxide layer remains during the annealing process.

[0028] In one embodiment, a method for preparing a high-precision, high-performance titanium alloy welding wire with a diameter of 1.20 mm is as follows: preparing a wire billet, and preparing the wire billet having the following components by mass percentage: Al: 6.45%; V: 3.95%; O: ≤0.2%; Fe: ≤0.2%; and the rest being Ti into a wire billet with a diameter of 5 mm, Rolling: The wire billet with the above composition and a diameter of 5 mm is rolled 12 times, the single-pass compression rate of the rolling is controlled to be 20%, the rolling speed is 25 m / min, and the titanium alloy wire billet is rolled 7 times continuously through four rollers, so that the diameter of the titanium alloy wire billet is rolled from 5.0 mm to 1.65 mm, the diameter accuracy is controlled to be 0.02 mm, and the roundness is 0.03 mm; the titanium alloy wire billet is rolled 4 times continuously through two rollers, so that the diameter of the titanium alloy wire billet is rolled from 1.65 mm to 1.26 mm, the diameter accuracy is controlled to be 0.01 mm, and the roundness is 0.015 mm, to ensure the accuracy and uniformity of the diameter; Peeling: The titanium alloy wire passes through two peeling dies in sequence to remove the surface material, ensuring the roundness is 0.01mm and the diameter accuracy is 0.01mm, and the peeling speed is 15m / min; the titanium alloy wire passes through a peeling die with a diameter of 1.23mm to remove the residual oxide layer on the surface; and passes through a peeling die with a diameter of 1.21mm to remove the surface defects of the material. Polishing: The titanium alloy wire is polished by a combination of four groups of 600-mesh abrasive belts and four groups of 1000-mesh abrasive belts. The two adjacent groups of abrasive belts are also arranged crosswise, preferably crosswise. The titanium alloy wire passes through 8 groups of abrasive belts in sequence, so that the surface roughness of the titanium alloy wire is ≤Ra 0.5μm. The diameter of the titanium alloy wire is 1.206mm; Annealing treatment: the polished wire is annealed. During annealing, the front and rear tension of the wire is adjusted and controlled to be 500N through the tension swing wire-retracting device. The annealing temperature is 775°C and the online annealing time is 15min to remove the internal stress of the material and reduce the material strength. The material strength of the wire is 280HV and the straightness is 0.028mm.

[0029] In another embodiment, a method for preparing a high-precision, high-performance titanium alloy welding wire with a diameter of 1.20 mm is as follows: preparing a wire billet, and preparing the wire billet with the following components by mass percentage: Al: 5.85%; V: 4.35%; O: ≤0.2%; Fe: ≤0.2%; C: ≤0.03%; N: ≤0.02%; H: ≤0.015%; and the rest being Ti into a wire billet with a diameter of 5 mm; Rolling: The wire billet with the above composition and a diameter of 5 mm is rolled 17 times, the single-pass compression rate of the rolling is controlled to be 10%, the rolling speed is 40 m / min, and the titanium alloy wire billet is rolled through four rollers for 10 consecutive times, so that the diameter of the titanium alloy wire billet is rolled from 5.0 mm to 1.65 mm, the diameter accuracy is controlled to be 0.02 mm, and the roundness is 0.03 mm; and then the titanium alloy wire billet is rolled through two rollers for 7 consecutive times, so that the diameter of the titanium alloy wire billet is rolled from 1.65 mm to 1.26 mm, the diameter accuracy is controlled to be 0.01 mm, and the roundness is 0.015 mm, to ensure the accuracy and uniformity of the diameter; Peeling: The titanium alloy wire passes through two peeling dies in sequence to remove the surface material, ensuring the roundness is 0.01mm and the diameter accuracy is 0.01mm, and the peeling speed is 40m / min; the titanium alloy wire passes through a peeling die with a diameter of 1.26mm to remove the residual oxide layer on the surface; and passes through a peeling die with a diameter of 1.21mm to remove the surface defects of the material. Polishing: The titanium alloy wire is polished by a combination of four groups of 600-mesh abrasive belts and four groups of 1000-mesh abrasive belts. The two adjacent groups of abrasive belts are also arranged crosswise, preferably crosswise. The titanium alloy wire passes through 8 groups of abrasive belts in sequence, so that the surface roughness of the titanium alloy wire is ≤Ra0.3μm. The diameter of the titanium alloy wire is 1.203mm; Annealing treatment: the polished wire is annealed. During annealing, the front and rear tension of the wire is adjusted and controlled to be 700N through the tension swing wire-retracting device. The annealing temperature is 800°C, the online annealing time is 15min, and the furnace is water-cooled. Argon gas is supplemented in the furnace at an argon flow rate of 15NL / min to ensure that no oxide layer remains during the annealing process, remove the internal stress of the material, and reduce the material strength. The material strength of the wire is 340HV and the straightness is 0.023mm.

[0030] 1. The high-precision and high-performance titanium alloy welding wire prepared by the invention has a smooth surface, good dimensional uniformity, better welding effect, and mechanical properties as shown in the following table:

[0031] 2. The process of preparing high-precision and high-performance titanium alloy welding wire through this invention can effectively save manpower and simplify the traditional wire drawing process, thereby achieving the purpose of increasing production capacity and reducing costs.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing high-precision and high-performance titanium alloy welding wire, characterized in that: Includes at least the following steps: S1. Prepare the wire blank: the composition mass percentage of the wire blank is: Al: 5.85%~6.45%; V: 3.95%~4.35%; O: ≤0.2%; Fe: ≤0.2%; the rest is Ti; S2 rolling: rolling the wire billet with the above composition into wire; S3 peeling: removing the surface oxide layer and impurities through a peeling die, and ensuring that the roundness of the wire reaches ≤0.01mm; S4 polishing: polishing the wire material so that the surface roughness of the wire material reaches ≤Ra0.5μm; S5 annealing treatment: annealing treatment is performed on the polished wire. During annealing, the front and rear tensions of the wire are adjusted and controlled to be 500-750N through the tension swing wire-retracting device, the annealing temperature is 750-800°C, and the online annealing time is 15min, so as to prepare the finished wire with a material strength of 280-340HV and a straightness of ≤0.3mm.

2. The method for preparing a high-precision and high-performance titanium alloy welding wire according to claim 1, characterized in that: In step S1, the wire rod blank contains one or more of the following components in a mass percentage: C: ≤0.03%; N: ≤0.02%; H: ≤0.015%.

3. The method for preparing a high-precision and high-performance titanium alloy welding wire according to claim 1 or 2, characterized in that: In step S1, the wire rod blank is prepared into a wire rod blank with a diameter of 5 mm.

4. The method for preparing a high-precision and high-performance titanium alloy welding wire according to claim 1, characterized in that: In step S2, the titanium alloy wire billet is continuously rolled 1 to 17 times to form the titanium alloy wire; the single-pass compression rate of the rolling is controlled to be 10 to 20%, and the rolling speed is 25 to 40 m / min.

5. The method for preparing a high-precision and high-performance titanium alloy welding wire according to claim 4, characterized in that: The titanium alloy wire billet is rolled through four rollers for 10 consecutive times, so that the diameter of the titanium alloy wire billet is rolled from 5.0 mm to 1.65 mm, the diameter accuracy is controlled to be 0.02 mm, and the roundness is 0.03 mm. The titanium alloy wire billet is then rolled through two rollers for 7 consecutive times, so that the diameter of the titanium alloy wire billet is rolled from 1.65 mm to 1.26 mm, the diameter accuracy is controlled to be 0.01 mm, and the roundness is 0.015 mm.

6. The method for preparing high-precision and high-performance titanium alloy welding wire according to claim 5, characterized in that: The four rollers include two groups of rollers, each group of rollers is composed of four rollers that are cross-shaped, and the outer circumference of each roller is provided with an arc-shaped rolling surface that matches the rolling diameter. The two groups of rollers are arranged front and back and cross-shaped at 45 degrees. The two-roller rolling element comprises a group of rollers, each group of rollers is composed of four rollers crossed in a cross shape, and an arc-shaped rolling surface matching the rolling diameter is provided on the outer circumference of each roller. Several groups of two-roller rolling elements are arranged front and back and crossed at 15 degrees.

7. The method for preparing a high-precision and high-performance titanium alloy welding wire according to claim 1, characterized in that: In step S3, the titanium alloy wire is passed through two stripping dies in sequence to remove surface material, ensuring a roundness of 0.01 mm and a diameter accuracy of 0.01 mm, and a stripping speed of 15-25 m / min.

8. The method for preparing high-precision and high-performance titanium alloy welding wire according to claim 1, characterized in that: In step S4, the titanium alloy wire is polished by a combination of several groups of 600-mesh abrasive belts and several groups of 1000-mesh abrasive belts to achieve a surface roughness of ≤Ra0.5 μm.

9. The method for preparing a high-precision and high-performance titanium alloy welding wire according to claim 8, characterized in that: Each set of sanding belts includes at least two sanding belts, and the two sanding belts are arranged front and back and crosswise.

10. A high-precision and high-performance titanium alloy welding wire, characterized in that: A wire material prepared by the method for preparing high-precision and high-performance titanium alloy welding wire according to any one of claims 1-9.

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