Multi-element packaging and electrode assembly welding smelting method based on titanium alloy reclaimed materials

Abstract

The invention provides a titanium alloy reclaimed material-based multi-element packaging and electrode assembly welding smelting method, which comprises the following steps of: designing an alloy ratio according to the component requirements of a target titanium alloy by taking a titanium alloy reclaimed material as a matrix; linear or strip-shaped alloy elements are added in a partitioned manner in a filamentous or strip-shaped manner; the granular alloy is wrapped in a long strip shape by aluminum foil and packaged in a pure titanium welded pipe, and the two ends are sealed to form an alloy bag; adding the sponge titanium and the alloy bag layer by layer in proportion, and pressing an electrode by adopting a horizontal or vertical press to form a composite electrode structure; drying the electrode in a drying oven; welding the electrode into a specified length by adopting argon shielded welding; smelting by adopting a vacuum consumable electric arc smelting furnace; and setting cooling time according to the specification of the electrode, deflating after cooling, and taking out the titanium ingot. By optimizing the burdening mode, the electrode assembly welding structure and the smelting process, the problem of adding the granular alloy is solved, the alloy component uniformity and the titanium ingot quality are improved, and the method is suitable for recycling and reusing various titanium alloys.

Description

Technical Field

[0001] This invention relates to the field of metal material preparation and resource recycling technology. Specifically, it relates to a multi-element encapsulation and electrode welding smelting method based on recycled titanium alloy materials, which is used for the integrated preparation of target titanium alloys and is applicable to high-end manufacturing fields such as aerospace, medical devices, new energy, and 3C consumer electronics. Background Technology

[0002] Currently, the low recycling rate of titanium alloy waste, the difficulty in adding granular alloys, and severe compositional segregation in the titanium alloy preparation process limit the low-cost, high-efficiency preparation and resource recycling of titanium alloys. In existing technologies, granular alloys (such as AlCr, AlV, and AlMo) are prone to falling off, contamination, and difficult to encapsulate, leading to uneven composition after electrode welding and problems such as inclusions and porosity during melting, severely affecting the quality of titanium ingots. While the addition of wire alloys (such as Al strips and Fe wires) is stable, it is complex, costly, and cannot meet the diverse needs of various titanium alloys. Therefore, there is an urgent need for an electrode welding and melting method that can adapt to various titanium alloys, recycled materials, and intermediate alloys to achieve high-quality, low-cost, and high-efficiency preparation of titanium alloys. Summary of the Invention

[0003] In view of this, the present invention aims to propose a multi-element encapsulation and electrode welding smelting method based on recycled titanium alloy materials, in order to solve the problems of low recycling rate of titanium alloy waste, inconvenience in adding granular alloys and strip alloys, and uneven composition after electrode welding in the prior art.

[0004] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0005] A multi-element encapsulation and electrode welding smelting method based on recycled titanium alloy materials includes:

[0006] (1) Alloy composition design and batching: Using recycled titanium alloy as the base, the alloy ratio is designed according to the target titanium alloy composition requirements; for linear or strip alloy elements, they are added in sections in the form of wires or strips; for granular alloys, they are wrapped in aluminum foil into long strips, encapsulated in pure titanium welded pipes, and sealed at both ends after compaction to form an alloy package.

[0007] (2) Electrode preparation: Sponge titanium and alloy bag are added in layers according to a certain ratio, and the electrode is pressed by a horizontal or vertical press to form a composite electrode structure.

[0008] (3) Electrode assembly welding: The electrodes are dried in an oven; the electrodes are welded to the specified length using argon shielded welding;

[0009] (4) Smelting process; Smelting is carried out using a vacuum consumable arc furnace;

[0010] (5) Cooling and unloading: Set the cooling time according to the electrode specifications, release the gas after cooling, and remove the titanium ingot.

[0011] The linear or strip alloying elements can be Al or Fe. Al is added in sections in the form of aluminum strips, and Fe is added in sections in the form of iron wire.

[0012] In some embodiments, the granular alloy is at least one of AlCr, AlMo, AlB, and AlV.

[0013] In some embodiments, the pressure of pressing the electrode during the electrode preparation process is not less than 250 MPa, and the density of the extruded electrode is ≥3.2 g / cm³.

[0014] In some embodiments, the outer two layers of the composite electrode structure are made of recycled titanium alloy.

[0015] In some embodiments, the drying temperature during electrode assembly welding is 180°C to 200°C.

[0016] In some embodiments, when using a vacuum consumable arc furnace for melting, the vacuum is evacuated to 0.1~100 Pa.

[0017] In some embodiments, the melting parameters in the melting process are set according to the electrode size and equipment type.

[0018] In some embodiments, the cooling time is 60 to 180 minutes.

[0019] In some embodiments, the average deviation of each element in the titanium ingot from the target value is within -0.08% to 0.08%.

[0020] Compared with existing technologies, the multi-element encapsulation and electrode welding smelting method based on recycled titanium alloy materials described in this invention has the following advantages:

[0021] The invention employs aluminum foil and pure titanium welded tube encapsulation to prevent granular alloy from falling off during the assembly process, thus improving the stability of the addition. The electrode partitioning structure, which involves welding the alloy package into sections within the recycled material electrode, avoids component segregation and improves uniformity. Furthermore, the addition method supports the combined addition of linear (Al strips, Fe wires) and granular (AlCr, AlV) alloying elements, making it suitable for the preparation of various titanium alloys such as Ti6Al4V, Ti6411, and Ti811. The titanium alloy scrap used in the preparation process can also be various types of titanium alloy scrap, such as TC4, TA5, and TA15. The vacuum consumable arc furnace used in the smelting process is compatible with various models, including ZH-200 and DHL-650, offering high equipment compatibility. Ultimately, it can produce electrodes and titanium ingots of various specifications, such as Ф100, Ф120, and Ф160, improving the stability and repeatability of the entire standardized electrode preparation and smelting process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the composite electrode structure described in an embodiment of the present invention;

[0023] Figure 2 This is a flow chart of the smelting process described in an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1-Titanium alloy recycled material layer, 2-Linear material layer, 3-Particle or powdered alloy encapsulation package Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] like Figures 1-2 As shown, the present invention provides a method for preparing titanium alloy, comprising the following steps:

[0028] (1) Alloy composition design and batching

[0029] Using recycled titanium alloy as the base material, the alloy ratio is designed according to the target titanium alloy composition requirements. For linear or strip-shaped alloying elements, they are added in sections in the form of filaments or strips. For granular alloys (such as AlCr, AlMo, AlB, AlV, etc.), they are wrapped in aluminum foil into long strips, encapsulated in pure titanium welded pipes, and sealed at both ends after compaction to form an alloy package.

[0030] The linear or strip alloying elements can be Al and / or Fe, added in sections in the form of aluminum strips, iron wires, etc. The granular alloys are AlCr, AlMo, AlB, AlV, etc. The granular or powdered alloying elements are set in sections in the recycled material electrode in the form of alloy bags to avoid material loss and component segregation.

[0031] (2) Electrode preparation

[0032] Add the sponge titanium and alloy pack in layers according to the specified ratio, and press the electrode using a horizontal or vertical press. The pressing pressure of the electrode should not be less than 250 MPa, and the density of the extruded electrode should be ≥3.2 g / cm³. The electrode surface should be free of cracks and delamination, and the alloy pack should not be exposed. The electrode should be sealed, moisture-proof, and pollution-proof. Each barrel of electrodes should be labeled with information such as brand, batch number, and quantity.

[0033] The resulting composite electrode structure consists of two outer layers made of recycled titanium alloy, which are the upper and lower layers. One of the two middle layers is composed of linear or strip-shaped alloying elements, while the other is a granular or powdered alloy encapsulation package.

[0034] (3) Electrode assembly welding

[0035] The electrodes are dried in an oven at 180℃~200℃ for 5 hours; the electrodes are welded to the specified length using argon shielded welding (purity ≥99.99%); the electrodes are checked for contamination and oil before welding.

[0036] (4) Smelting process

[0037] A vacuum self-consuming electric arc melting furnace (such as ZH-200, DHL-650, etc.) is used to evacuate to 0.1Pa~100Pa; the arc length is controlled to ensure the stability of the molten pool; the melting parameters are set according to the electrode size and equipment type, including arc voltage, arc current, vacuum degree, cooling time, etc.

[0038] (5) Cooling and unloading of ingots

[0039] The cooling time is set according to the electrode specifications, generally 60~180 minutes; after cooling, the gas is released, the titanium ingot is removed, and hot rinsing and surface cleaning are performed; the titanium ingot is marked with information such as grade, batch number, furnace number, weight, and melting date. Furthermore, the average deviation of each element in the final titanium ingot from the target value is within -0.08%~0.08%.

[0040] Among them, linear refers to metal raw materials with a diameter between 2mm and 10mm and an unlimited length (generally 0.5m to 3m), in the form of long strips or regular cylindrical shapes, such as aluminum strips and iron strips. It is suitable for occasions that require a large amount of monomer to be added or are easy to handle mechanically.

[0041] Filamentous: This typically refers to long, thin metal raw materials with a diameter between 0.5mm and 2mm and a relatively long length (generally 1m to 5m), such as iron wire and aluminum wire. It is suitable for process scenarios that require precise control of the addition amount or for zoned addition.

[0042] Strip-shaped: A transitional form between line-shaped and block-shaped, typically referring to flat metal strips with a thickness of 3mm to 10mm, a width of 10mm to 50mm, and unlimited length. Examples include strips cut from aluminum sheets. Suitable for processes requiring layering or easy welding.

[0043] The granular alloy encapsulation technology of this invention uses aluminum foil + pure titanium welded tube encapsulation to prevent the granular alloy from falling off during the assembly welding process, thus improving the stability of the addition. The electrode partitioning structure, which welds the alloy package into the recycled material electrode in sections, avoids component segregation and improves uniformity. Furthermore, the addition method of this invention supports the combined addition of linear (Al strips, Fe wires) and granular (AlCr, AlV) alloying elements. It is applicable to the preparation of various titanium alloys such as Ti6Al4V, Ti6411, and Ti811. The titanium alloy scrap used in the preparation process can also be various types of titanium alloy scrap such as TC4, TA5, and TA15. The vacuum consumable arc furnace used in the smelting process is suitable for various models such as ZH-200 and DHL-650, with high equipment compatibility. Ultimately, it can produce electrodes and titanium ingots of various specifications such as Ф100, Ф120, and Ф160, improving the stability and repeatability of the entire standardized electrode preparation and smelting process.

[0044] Example 1

[0045] Preparation of Ti6411 titanium alloy based on TC4 recycled material

[0046] (1) Objectives and basic data

[0047]

[0048] (2) Addition method and material calculation (based on 10kg electrode)

[0049]

[0050] (3) Electrode preparation

[0051] AlCr master alloy particles are loaded into pure titanium welded pipes wrapped in aluminum foil and sealed at both ends; TC4 recycled material, Al strips, AlCr master alloy welded pipes, and Fe wires are then assembled and welded in layers according to a specific ratio.

[0052] (4) Electrode pressing

[0053] The press pressure is 250 MPa; the electrode density is 3.2 g / cm³, the surface is smooth and crack-free, and the alloy cladding is well sealed.

[0054] (5) Electrode assembly welding

[0055] Five electrodes were dried in an oven at 180℃~200℃ for 5 hours, and then welded into a single electrode weighing 50kg using argon gas shielded welding with a purity of ≥99.99%. The welding process was pollution-free, the electrode structure remained intact, and there was no material loss or contamination.

[0056] (6) Smelting process

[0057] The ZH-200 vacuum self-consuming electric arc furnace was used; the vacuum degree was 5~20Pa, the arc voltage was 32V, and the arc current was 4200A; after one ingot melting, the cooling time was 60 minutes, and the Φ160×1000mm titanium ingot was taken out.

[0058] (7) Test results

[0059] The titanium ingot composition is as follows, conforming to the Ti6411 standard;

[0060]

[0061] The titanium ingot has a smooth surface, free from defects such as pores and cracks; the ingot size meets the design requirements and can be directly used for subsequent processing or the preparation of high-end titanium products.

[0062] Example 2

[0063] Preparation of Ti6Al4V titanium alloy based on TA5 recycled material

[0064] (1) Objectives and basic data

[0065]

[0066] (2) Addition method and material calculation (based on 10kg electrode)

[0067]

[0068] (3) Electrode preparation

[0069] AlV55 intermediate alloy granules are loaded into pure titanium welded pipes wrapped in aluminum foil and sealed at both ends; TA5 recycled material, Al strips, and AlV55 intermediate alloy welded pipes are then assembled and welded in layers according to a specific ratio.

[0070] (4) Electrode pressing

[0071] The press pressure is 250 MPa; the electrode density is 3.2 g / cm³, the surface is smooth, without cracks or delamination; the alloy package is well sealed and there is no exposure.

[0072] (5) Electrode assembly welding

[0073] Twelve electrodes were dried in an oven at 180℃~200℃ for 5 hours. The electrodes were then welded into a composite electrode weighing 120kg using argon gas shielded welding with a purity of ≥99.99%. The electrode structure remained intact during the welding process, with no material loss or contamination.

[0074] (6) Smelting process

[0075] A DHL-650 vacuum arc furnace was used; the vacuum level was 1~15Pa, the arc voltage was 35V, and the arc current was 5500A; after one ingot melting, the cooling time was 120 minutes, and the Φ220×1000mm titanium ingot was taken out.

[0076] (7) Test results

[0077] The titanium ingot composition is as follows, which meets the requirements of the Ti6Al4V standard.

[0078]

[0079] The titanium ingot has a smooth surface, free from defects such as pores and cracks; the ingot size meets the design requirements and can be directly used for subsequent processing or the preparation of high-end titanium products.

[0080] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A multi-element encapsulation and electrode welding smelting method based on recycled titanium alloy materials, characterized in that, include: (1) Alloy composition design and batching: Using recycled titanium alloy as the base, the alloy ratio is designed according to the target titanium alloy composition requirements; for linear or strip alloy elements, they are added in sections in the form of wires or strips; for granular alloys, they are wrapped in aluminum foil into long strips, encapsulated in pure titanium welded pipes, and sealed at both ends after compaction to form an alloy package. (2) Electrode preparation: Sponge titanium and alloy bag are added in layers according to a certain ratio, and the electrode is pressed by a horizontal or vertical press to form a composite electrode structure; (3) Electrode assembly welding: The electrodes are dried in an oven; the electrodes are welded to the specified length using argon shielded welding; (4) Smelting process; Smelting is carried out using a vacuum consumable arc furnace; (5) Cooling and unloading: Set the cooling time according to the electrode specifications, release the gas after cooling, and remove the titanium ingot.

2. The smelting method according to claim 1, characterized in that, The linear or strip alloying elements are Al and Fe. Al is added in sections in the form of aluminum strips, and Fe is added in sections in the form of iron wire.

3. The smelting method according to claim 1, characterized in that, The granular alloy is at least one of AlCr, AlMo, AlB, and AlV.

4. The smelting method according to claim 1, characterized in that, The electrode is pressed under a pressure of not less than 250 MPa during the electrode preparation process, and the electrode density is ≥3.2 g / cm³.

5. The smelting method according to claim 1, characterized in that, The outer two layers of the composite electrode structure are made of recycled titanium alloy.

6. The smelting method according to claim 1, characterized in that, The drying temperature during electrode assembly welding is 180℃~200℃.

7. The smelting method according to claim 1, characterized in that, When using a vacuum self-consuming arc melting furnace for melting, the vacuum is evacuated to 0.1~100 Pa.

8. The smelting method according to claim 1, characterized in that, The smelting parameters in the smelting process are set according to the electrode size and equipment type.

9. The smelting method according to claim 1, characterized in that, The cooling time is 60 to 180 minutes.

10. The smelting method according to claim 1, characterized in that, The average deviation of each element in the titanium ingot from the target value is within -0.08% to 0.08%.

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