A processing method for preparing titanium welding wire by multi-roll die combined drawing

Abstract

The application discloses a processing method for preparing titanium welding wire through multi-roller die combined drawing, and comprises the following steps: 1, peeling the titanium bar after rounding to obtain a bar material to be drawn by roller die; 2, performing first roller die drawing to obtain a first roller die bar material; 3, performing first vacuum annealing to obtain a first roller die bar material after vacuum annealing; 4, performing second roller die drawing to obtain a second roller die bar material; 5, performing third roller die drawing to obtain a third roller die bar material; 6, performing product vacuum annealing and polishing to obtain titanium welding wire. The application realizes initial large deformation of the titanium bar through first roller die drawing, eliminates the stress of the initial large deformation of the titanium bar through first vacuum annealing, realizes intermediate process moderate deformation of the titanium bar through second roller die drawing, realizes small deformation of the titanium bar through third roller die drawing, eliminates the stress and guarantees the surface smoothness through product vacuum annealing, and finally obtains titanium welding wire with excellent performance.

Description

Technical Field

[0001] This invention belongs to the field of titanium wire preparation technology, specifically relating to a processing method for preparing titanium welding wire by multi-roll die combination drawing. Background Technology

[0002] Titanium and titanium alloys are increasingly widely used in aerospace, shipbuilding, chemical, petroleum, and biomedical fields due to their high specific strength, excellent comprehensive mechanical properties, good corrosion resistance, and excellent biocompatibility. Titanium products account for approximately 60% of all titanium alloy products, with titanium wire holding a significant market position due to welding requirements.

[0003] In industry, commonly used titanium welding wire specifications range from Φ2.0mm to Φ3.0mm. Traditional manufacturing processes primarily involve repeated hot drawing using a fixed die, requiring preheating before drawing and annealing during the drawing process. Because the deformation amount in a single pass of fixed drawing is limited, and only one die can be used at a time, multiple draws are needed to achieve the final specifications. Furthermore, the preheating treatment required for each hot draw increases the production cycle. Additionally, the accumulated deformation leads to increased processing stress, making further deformation difficult. Simultaneously, during hot deformation, titanium comes into contact with harmful elements such as hydrogen, oxygen, and nitrogen in the atmosphere, causing excessive levels of these gaseous elements. Vacuum annealing is then necessary during drawing to eliminate processing stress and reduce the gaseous element content. The entire process is complex, inefficient, wasteful of materials, and results in low-quality final products.

[0004] Therefore, there is an urgent need for an improved method for preparing titanium welding wire. Summary of the Invention

[0005] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a processing method for preparing titanium welding wire using a multi-roller die combination drawing process. This method achieves a large initial deformation of the titanium rod through the first roll die drawing, eliminates the stress caused by this initial large deformation through a vacuum annealing process, achieves a moderate deformation of the titanium rod through the second roll die drawing, achieves a small deformation of the titanium rod through the third roll die drawing, and eliminates stress and ensures surface finish through vacuum annealing of the finished product, thus obtaining the titanium welding wire.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a processing method for preparing titanium welding wire by multi-roll die combination drawing, characterized in that the method includes the following steps:

[0007] Step 1: Round the titanium rod to obtain a rounded rod, then peel off the outer layer of the rounded rod to obtain the rod material to be drawn by the roller die.

[0008] Step 2: Perform the first roller drawing on the bar stock obtained in Step 1 to obtain a first-stage roller drawing bar stock.

[0009] Step 3: Vacuum anneal the primary roll die bar obtained in Step 2 to obtain the vacuum annealed primary roll die bar, which mainly eliminates the stress of the initial large deformation of the titanium bar.

[0010] Step 4: Perform a second roll drawing on the vacuum-annealed primary roll die bar obtained in Step 3 to obtain a secondary roll die bar.

[0011] Step 5: The secondary roller die bar obtained in Step 4 is subjected to a third roller die drawing to obtain a tertiary roller die bar.

[0012] Step 6: Perform vacuum annealing on the three-stage roller die bar material obtained in Step 5, and then perform surface polishing to obtain titanium welding wire.

[0013] This invention uses hot-rolled titanium rods, which facilitates the rapid processing of titanium raw materials into titanium rods. Roundness and surface finish are ensured through rounding and peeling, facilitating subsequent multi-roll drawing. The first roll drawing mainly achieves the initial large deformation of the titanium rod. The first vacuum annealing mainly eliminates the stress of the initial large deformation of the titanium rod. The second roll drawing mainly achieves a moderate deformation of the titanium rod in the middle process. The third roll drawing mainly achieves a small deformation of the titanium rod. The finished product vacuum annealing eliminates the stress of the titanium welding wire and ensures the surface finish, thus obtaining the titanium welding wire.

[0014] The above-mentioned processing method for preparing titanium welding wire by multi-roll die combination drawing is characterized in that, in step one, the diameter of the titanium rod is 8mm to 9mm, the rounding deformation in the rounding step is 8.7% to 9.8%, and the diameter of the rounded rod is 7.6mm to 8.6mm; the peeling is performed using a centerless lathe, the peeling amount is 0.3mm to 0.4mm, and the diameter of the rod to be drawn by the roll die is 7.2mm to 8.2mm, with a bright surface. This invention facilitates processing by controlling the size of the titanium rod, obtaining titanium welding wire of suitable size. By controlling the parameters of rounding and peeling, the roundness and surface finish of the rod to be drawn by the roll die are controlled, laying a foundation for the first roll die drawing.

[0015] The above-mentioned processing method for preparing titanium welding wire using a multi-roll die combination drawing method is characterized in that, in step two, the first roll die drawing is a continuous drawing using a combination of four sets of roll dies. Each set of roll dies consists of mutually perpendicular transverse and longitudinal roll dies. The deformation of the roll dies is 11.8% to 18.7%, the total deformation is 46.5% to 51.8%, the drawing speed is 80 m / min to 100 m / min, and the diameter of the first roll die bar is 5.0 mm to 6.0 mm. This invention ensures the effectiveness of the roll die drawing by using a continuous drawing method with four sets of roll dies. By controlling the parameters of the first roll die drawing, the bar to be drawn undergoes a relatively large deformation, facilitating subsequent processing and providing a foundation for the preparation of titanium welding wire.

[0016] The above-mentioned processing method for preparing titanium welding wire by multi-roll die combination drawing is characterized in that the vacuum annealing temperature in step three is 600℃~650℃, and the time is 120min~180min. This invention, by controlling the parameters of vacuum annealing, effectively eliminates the stress of the first large deformation during the first roll die drawing and ensures surface finish.

[0017] The above-mentioned processing method for preparing titanium welding wire using a multi-roll die combination drawing method is characterized in that the second roll die drawing in step four involves continuous drawing with four sets of roll dies. Each set of roll dies consists of mutually perpendicular horizontal and vertical roll dies. The deformation of each roll die is 9.7% to 19.5%, the total deformation is 38.9% to 51.0%, the drawing speed is 100 m / min to 120 m / min, and the diameter of the secondary roll die bar is 3.5 mm to 4.5 mm. This invention ensures the effectiveness of roll die drawing by using a four-set roll die combination continuous drawing. By controlling the drawing parameters of the second roll die, the primary roll die bar undergoes a moderate amount of deformation in the intermediate process, facilitating subsequent processing and providing a foundation for the preparation of titanium welding wire.

[0018] The above-mentioned processing method for preparing titanium welding wire by multi-roll die combination drawing is characterized in that the third roll die drawing in step five is a continuous drawing of four sets of roll dies. Each set of roll dies consists of mutually perpendicular horizontal and vertical roll dies. The deformation of each roll die is 12.9% to 27.0%, the total deformation is 54.7% to 65.7%, the drawing speed is 100 m / min to 120 m / min, and the diameter of the third roll die bar is 2.05 mm to 3.05 mm. This invention ensures the effectiveness of roll die drawing by using a four-set roll die combination for continuous drawing. By controlling the drawing parameters of the third roll die, the secondary roll die bar undergoes a smaller deformation, facilitating precise control of the titanium welding wire size and preparing titanium welding wire of suitable dimensions.

[0019] The above-mentioned processing method for preparing titanium welding wire using a multi-roll die combination drawing method is characterized in that, in step six, the vacuum annealing temperature of the finished product is 600℃~650℃, the time is 120min~180min, the grinding thickness in the surface polishing is 0.03mm~0.05mm, and the diameter of the titanium welding wire is 2.0mm~3.0mm. This invention, by controlling the parameters of vacuum annealing, fully eliminates deformation stress, and by controlling the grinding thickness, ensures the dimensional accuracy and surface finish of the titanium welding wire, thus achieving the preparation of high-quality titanium welding wire.

[0020] The above-described processing method for preparing titanium welding wire using a multi-roll die combination drawing method is characterized in that heating oxidation and surface coating are not required before the first roll die drawing in step two, the second roll die drawing in step four, and the third roll die drawing in step five. Due to the bite advantage of roll die drawing, heating oxidation and surface coating are not required before the roll die drawing process, thus improving the working environment of the drawing process and making the production process more environmentally friendly.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. This invention uses hot-rolled titanium rods, which facilitates the rapid processing of titanium raw materials into titanium rods. Rounding and peeling ensure roundness and surface finish, facilitating subsequent multi-roll drawing. The first roll drawing mainly achieves the initial large deformation of the titanium rod. The first vacuum annealing mainly eliminates the stress of the initial large deformation of the titanium rod. The second roll drawing mainly achieves a moderate deformation of the titanium rod in the middle process. The third roll drawing mainly achieves a small deformation of the titanium rod. The finished product vacuum annealing eliminates the stress of the titanium welding wire and ensures surface finish, thus obtaining the titanium welding wire.

[0023] 2. This invention combines multiple sets of roller dies to facilitate the processing of titanium welding wire with large deformation. In addition, it has the advantages of extremely high drawing speed, fewer intermediate heat treatments, less product pollution during the production process, uniform product size and high quality.

[0024] 3. In this invention, titanium rods do not require preheating treatment and can be directly drawn continuously using multiple sets of roller dies. Compared with the hot drawing speed of 1m / min to 4m / min using a fixed die, the continuous drawing speed of multiple roller dies is 80m / min to 120m / min. Moreover, the deformation of each roller die is 8% to 20% higher than that of a fixed die, which greatly improves production efficiency. Only two vacuum heat treatments are required, which is 2 to 3 fewer than conventional methods. This reduces the contamination of the wire during the operation, improves production efficiency, lowers production costs, and improves the quality of titanium welding wire.

[0025] 4. In the pretreatment process of the bar billet before drawing, the present invention does not require heating to oxidize the surface or applying lubricant. The production process is more green and environmentally friendly than the traditional one. In addition, the pretreatment process does not require heating, which reduces production costs and improves efficiency.

[0026] 5. The drawing speed of the multi-roll die combination drawing method of the present invention is one to two orders of magnitude faster than that of the traditional fixed die drawing method, and the deformation is large, which greatly improves the production efficiency. Compared with the traditional fixed die hot drawing method, the wire material is constantly cold deformed during the processing of the multi-roll die combination drawing method of the present invention, and there is no contact with harmful elements such as oxygen, nitrogen and hydrogen during the heating process, which reduces the pollution of harmful elements. In addition, the material structure is more uniform.

[0027] 6. This invention uses a combination of roller dies to continuously draw titanium welding wire. Each drawing process involves continuous drawing through four dies, with a total deformation of approximately 38.5% to 65.7% and a drawing speed of 80m / min to 120m / min. It features large deformation, high drawing speed, and a simple process.

[0028] The technical solution of the present invention will be further described in detail below through embodiments. Detailed Implementation

[0029] Example 1

[0030] This embodiment includes the following steps:

[0031] Step 1: The hot-rolled titanium bar with a diameter of 8mm is rounded using a wire drawing machine. The rounding deformation is 9.8%, resulting in a rounded bar with a diameter of 7.6mm. Then, the rounded bar is peeled off using a centerless machine with a peeling amount of 0.4mm, resulting in a bright bar with a diameter of 7.2mm ready for drawing by the roller die.

[0032] Step 2: The 7.2mm diameter bright bar stock obtained in Step 1 is subjected to the first roll drawing using a combination of four sets of roll dies in continuous drawing. Each set of roll dies consists of mutually perpendicular horizontal and vertical roll dies. The deformation amounts of each roll die are 13.4%, 17.1%, 18.7%, and 17.4%, respectively, with a total deformation of 51.8%. The drawing speed is 80m / min, resulting in a 5.0mm diameter primary roll drawing bar stock. No heating oxidation or surface coating is required before the first roll drawing.

[0033] Step 3: Perform vacuum annealing on the primary roll die bar material with a diameter of 5.0 mm obtained in Step 2. The annealing temperature is 600℃ and the time is 120 min to obtain a primary roll die bar material with a diameter of 5.0 mm after vacuum annealing.

[0034] Step 4: The vacuum-annealed primary roll bar with a diameter of 5.0 mm obtained in Step 3 is subjected to a second roll drawing using a combination of four sets of roll dies in continuous drawing. Each set of roll dies consists of mutually perpendicular horizontal and vertical roll dies, with deformation amounts of 11.6%, 16.3%, 17.7%, and 19.5% for each die, respectively, for a total deformation of 51%. The drawing speed is 100 m / min, resulting in a secondary roll bar with a diameter of 3.5 mm. No heating oxidation or surface coating is required before the second roll drawing.

[0035] Step 5: The 3.5mm diameter secondary roll die bar obtained in Step 4 is subjected to a third roll die drawing. A four-set roll die combination is used for continuous drawing. Each roll die consists of mutually perpendicular horizontal and vertical roll dies. The deformation of each roll die is 16.4%, 23.4%, 26.5%, and 27%, respectively, with a total deformation of 65.7%. The drawing speed is 100m / min, resulting in a 2.05mm diameter tertiary roll die bar. No heating oxidation or surface coating is required before the third roll die drawing.

[0036] Step 6: The 2.05mm diameter three-stage roll die bar obtained in Step 5 is subjected to vacuum annealing at a temperature of 600℃ for 120 minutes. After that, the surface is polished to a thickness of 0.05mm to obtain a titanium welding wire with a diameter of 2.00mm.

[0037] Testing revealed that the hydrogen content of the titanium welding wire prepared in this embodiment was 0.003%, which meets the requirement (the standard requires a hydrogen content of less than 0.008%). The diameters of multiple parts of the titanium welding wire were measured and found to be 2.003 mm, 2.005 mm, and 2.004 mm, respectively, which meet the national standard requirements.

[0038] Example 2

[0039] This embodiment includes the following steps:

[0040] Step 1: The 9mm diameter titanium bar obtained by hot rolling is rounded using a wire drawing machine. The rounding deformation is 8.7%, resulting in a rounded bar with a diameter of 8.6mm. Then, the rounded bar is peeled off using a centerless machine with a peeling amount of 0.4mm, resulting in a bright bar material with a diameter of 8.2mm ready for drawing by the roller die.

[0041] Step 2: The 8.2mm diameter bright bar stock obtained in Step 1 is subjected to the first roll drawing using a combination of four sets of roll dies in continuous drawing. Each set of roll dies consists of mutually perpendicular horizontal and vertical roll dies. The deformation amounts of each roll die are 11.8%, 15.0%, 16.2%, and 14.8%, respectively, with a total deformation of 46.5%. The drawing speed is 100m / min, resulting in a 6.0mm diameter primary roll drawing bar stock. No heating oxidation or surface coating is required before the first roll drawing.

[0042] Step 3: Perform vacuum annealing on the primary roll die bar material with a diameter of 6.0 mm obtained in Step 2. The annealing temperature is 650℃ and the time is 180 min to obtain a primary roll die bar material with a diameter of 6.0 mm after vacuum annealing.

[0043] Step 4: The vacuum-annealed primary roll bar with a diameter of 6.0 mm obtained in Step 3 is subjected to a second roll drawing using a combination of four sets of roll dies in continuous drawing. Each set of roll dies consists of mutually perpendicular transverse and longitudinal roll dies, with deformation amounts of 9.3%, 13.5%, 14.5%, and 15.7% for each roll, respectively, for a total deformation amount of 43.8%. The drawing speed is 120 m / min, resulting in a secondary roll bar with a diameter of 4.5 mm. No heating oxidation or surface coating is required before the second roll drawing.

[0044] Step 5: The 4.5mm diameter secondary roll die bar obtained in Step 4 is subjected to a third roll die drawing. A four-set roll die combination is used for continuous drawing. Each roll die consists of mutually perpendicular horizontal and vertical roll dies. The deformation of each roll die is 12.9%, 18.1%, 19.9%, and 20.6%, respectively, with a total deformation of 54.7%. The drawing speed is 110m / min, resulting in a 3.03mm diameter tertiary roll die bar. No heating oxidation or surface coating is required before the third roll die drawing.

[0045] Step 6: The 3.03mm diameter three-stage roll die bar obtained in Step 5 is subjected to vacuum annealing at a temperature of 650℃ for 180 minutes. After that, the surface is polished to a thickness of 0.03mm to obtain a titanium welding wire with a diameter of 3.00mm.

[0046] Testing revealed that the hydrogen content of the titanium welding wire prepared in this embodiment was 0.003%, meeting the requirement (the standard requires a hydrogen content of less than 0.008%). Furthermore, the diameters of multiple parts of the titanium welding wire were measured and found to be 3.003 mm, 3.005 mm, and 3.004 mm, respectively, which meet national standard requirements.

[0047] Example 3

[0048] This embodiment includes the following steps:

[0049] Step 1: The hot-rolled titanium bar with a diameter of 8mm is rounded using a wire drawing machine. The rounding deformation is 9.8%, resulting in a rounded bar with a diameter of 7.6mm. Then, the rounded bar is peeled off using a centerless machine with a peeling amount of 0.3mm, resulting in a bright bar with a diameter of 7.3mm ready for drawing by the roller die.

[0050] Step 2: The 7.3mm diameter bright bar stock obtained in Step 1 is subjected to the first roll drawing using a combination of four sets of roll dies in continuous drawing. Each set of roll dies consists of mutually perpendicular horizontal and vertical roll dies, with deformation amounts of 13.2%, 14.2%, 15.2%, and 16.5% for each die, respectively, for a total deformation of 47.3%. The drawing speed is 80m / min, resulting in a 5.3mm diameter primary roll drawing bar stock. No heating oxidation or surface coating is required before the first roll drawing.

[0051] Step 3: Perform vacuum annealing on the primary roll die bar material with a diameter of 5.3 mm obtained in Step 2. The annealing temperature is 630℃ and the time is 150 min to obtain a primary roll die bar material with a diameter of 5.3 mm after vacuum annealing.

[0052] Step 4: The vacuum-annealed primary roll bar with a diameter of 5.3 mm obtained in Step 3 is subjected to a second roll drawing using a combination of four sets of roll dies in continuous drawing. Each set of roll dies consists of mutually perpendicular horizontal and vertical roll dies, with deformation amounts of 11.0%, 11.6%, 12.4%, and 13.2% for each roll, respectively, for a total deformation amount of 40.2%. The drawing speed is 100 m / min, resulting in a secondary roll bar with a diameter of 4.1 mm. No heating oxidation or surface coating is required before the second roll drawing.

[0053] Step 5: The 4.1mm diameter secondary roll die bar obtained in Step 4 is subjected to a third roll die drawing. A four-set roll die combination is used for continuous drawing. Each roll die consists of mutually perpendicular horizontal and vertical roll dies. The deformation of each roll die is 18.6%, 20.5%, 22.8%, and 23.3%, respectively, with a total deformation of 61.6%. The drawing speed is 100m / min, resulting in a 2.54mm diameter tertiary roll die bar. No heating oxidation or surface coating is required before the third roll die drawing.

[0054] Step 6: The 2.54mm diameter three-stage roll die bar obtained in Step 5 is subjected to vacuum annealing at a temperature of 630℃ for 150 minutes. After that, the surface is polished to a thickness of 0.04mm to obtain a titanium welding wire with a diameter of 2.5mm.

[0055] Testing revealed that the hydrogen content of the titanium welding wire prepared in this embodiment was 0.002%, meeting the requirement (the standard requires a hydrogen content of less than 0.008%). Furthermore, the diameters of multiple parts of the titanium welding wire were measured and found to be 2.503 mm, 2.502 mm, and 2.503 mm, respectively, which meets national standard requirements.

[0056] Example 4

[0057] This embodiment includes the following steps:

[0058] Step 1: The hot-rolled titanium bar with a diameter of 8.5mm is rounded using a wire drawing machine. The rounding deformation is 9.2%, resulting in a rounded bar with a diameter of 8.1mm. Then, the rounded bar is peeled off using a centerless machine with a peeling amount of 0.4mm, resulting in a bright bar with a diameter of 7.7mm ready for drawing by the roller die.

[0059] Step 2: The 7.7mm diameter bright bar stock obtained in Step 1 is subjected to the first roll drawing using a combination of four sets of roll dies in continuous drawing. Each set of roll dies consists of mutually perpendicular horizontal and vertical roll dies. The deformation amounts of each roll die are 12.6%, 16.0%, 17.4%, and 16.0%, respectively, with a total deformation of 49.0%. The drawing speed is 90m / min, resulting in a 5.5mm diameter primary roll drawing bar stock. No heating oxidation or surface coating is required before the first roll drawing.

[0060] Step 3: Perform vacuum annealing on the primary roll die bar material with a diameter of 5.5 mm obtained in Step 2. The annealing temperature is 650℃ and the time is 150 min to obtain a primary roll die bar material with a diameter of 5.5 mm after vacuum annealing.

[0061] Step 4: The 5.5mm diameter primary roll bar obtained in Step 3 after vacuum annealing is subjected to a second roll drawing. A four-roll die combination is used for continuous drawing. Each roll die consists of mutually perpendicular horizontal and vertical roll dies. The deformation of each roll die is 10.6%, 11.2%, 11.9%, and 12.6%, respectively, with a total deformation of 38.9%. The drawing speed is 110m / min, resulting in a 4.3mm diameter secondary roll bar. No heating oxidation or surface coating is required before the second roll drawing.

[0062] Step 5: The 4.3mm diameter secondary roll die bar obtained in Step 4 is subjected to a third roll die drawing. A four-set roll die combination is used for continuous drawing. Each roll die consists of mutually perpendicular horizontal and vertical roll dies. The deformation of each roll die is 13.5%, 19.0%, 21.0%, and 20.7%, respectively, with a total deformation of 56.1%. The drawing speed is 120m / min, resulting in a 2.85mm diameter tertiary roll die bar. No heating oxidation or surface coating is required before the third roll die drawing.

[0063] Step 6: The 2.85mm diameter three-stage roll die bar obtained in Step 5 is subjected to vacuum annealing at a temperature of 650℃ for 180 minutes. After that, the surface is polished to a thickness of 0.05mm to obtain a titanium welding wire with a diameter of 2.8mm.

[0064] Testing revealed that the hydrogen content of the titanium welding wire prepared in this embodiment was 0.001%, meeting the requirement (the standard requires a hydrogen content of less than 0.008%). Furthermore, the diameters of multiple parts of the titanium welding wire were measured and found to be 2.802 mm, 2.804 mm, and 2.802 mm, respectively, which meets national standard requirements.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A processing method for preparing titanium welding wire by multi-roll die combination drawing, characterized in that, The method includes the following steps: Step 1: Round the titanium rod to obtain a rounded rod, and then peel off the skin from the rounded rod to obtain the rod material to be drawn by the roller die. Step 2: Perform the first roll drawing on the bar stock obtained in Step 1 to obtain a first roll drawing bar stock; the first roll drawing is a continuous drawing of four sets of roll dies, each set of roll dies consists of mutually perpendicular horizontal and vertical roll dies, the deformation of each roll die is 11.8%~18.7%, the total deformation is 46.5%~51.8%, the drawing speed is 80m / min~100m / min, and the diameter of the first roll drawing bar stock is 5.0mm~6.0mm; Step 3: Perform vacuum annealing on the primary roll die bar obtained in Step 2 to obtain the vacuum annealed primary roll die bar. Step 4: The vacuum-annealed primary roll die bar obtained in Step 3 is subjected to a second roll die drawing to obtain a secondary roll die bar. The second roll die drawing is a continuous drawing of four sets of roll dies. Each set of roll dies consists of mutually perpendicular horizontal and vertical roll dies. The deformation of each roll die is 9.7%~19.5%, the total deformation is 38.9%~51.0%, the drawing speed is 100m / min~120m / min, and the diameter of the secondary roll die bar is 3.5mm~4.5mm. Step 5: The secondary roller die bar obtained in Step 4 is subjected to a third roller die drawing to obtain a tertiary roller die bar. The third roller die drawing is a continuous drawing of four sets of roller dies. Each set of roller dies consists of mutually perpendicular horizontal and vertical roller dies. The deformation of each roller die is 12.9%~27.0%, the total deformation is 54.7%~65.7%, the drawing speed is 100m / min~120m / min, and the diameter of the tertiary roller die bar is 2.05mm~3.05mm. Step 6: Perform vacuum annealing on the three-stage roller die bar material obtained in Step 5, and then perform surface polishing to obtain titanium welding wire.

2. The processing method for preparing titanium welding wire by multi-roll die combination drawing according to claim 1, characterized in that, In step one, the diameter of the titanium rod is 8mm~9mm, the rounding deformation in the rounding process is 8.7%~9.8%, and the diameter of the rounded rod is 7.6mm~8.6mm; the peeling is performed using a centerless lathe, the peeling amount is 0.3mm~0.4mm, and the diameter of the rod to be drawn by the roller die is 7.2mm~8.2mm, with a bright surface.

3. The processing method for preparing titanium welding wire by multi-roll die combination drawing according to claim 1, characterized in that, The vacuum annealing temperature in step three is 600℃~650℃, and the time is 120min~180min.

4. The processing method for preparing titanium welding wire by multi-roll die combination drawing according to claim 1, characterized in that, In step six, the vacuum annealing temperature of the finished product is 600℃~650℃, and the time is 120min~180min. The thickness of the surface grinding is 0.03mm~0.05mm, and the diameter of the titanium welding wire is 2.0mm~3.0mm.

5. The processing method for preparing titanium welding wire by multi-roll die combination drawing according to claim 1, characterized in that, The first roller drawing in step two, the second roller drawing in step four, and the third roller drawing in step five do not require heating oxidation or surface coating.