A method for manufacturing an argon-protected drag cover and TA10 alloy tower internals

Abstract

The application discloses a manufacturing method of an argon protection drag cover and a TA10 alloy inner part of a tower, and the argon protection drag cover comprises an argon inlet connecting device, an argon shunt hole, an upper argon flow guide pipe, an argon airflow refining device, an upper argon distribution cover and a lower argon flow guide pipe. Argon enters the upper argon flow guide pipe and the lower argon flow guide pipe respectively. The argon in the upper argon flow guide pipe is filled into the upper argon distribution cover through the argon shunt hole, and a uniform vertical argon airflow curtain is formed in the upper argon distribution cover through the argon airflow refining device. The argon in the lower argon flow guide pipe is filled into the lower argon distribution cover through the argon shunt hole, and a reliable horizontal argon airflow curtain is formed. The argon arc gun porcelain nozzle is provided with a fine mesh screen, the argon airflow is refined, the two airflow curtains of the argon protection drag cover and the argon airflow of the argon arc gun form a continuous and air-tight gas protection cover, the weld appearance of the TA10 alloy is silver-white, the problem of weld oxidation is solved, and the welding efficiency and appearance quality of the TA10 alloy are effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of chemical equipment processing technology, specifically relating to a method for manufacturing an argon gas protective shroud and TA10 alloy tower internals. Background Technology

[0002] In chemical containers, the internals of the tower serve to ensure better contact between gas and liquid within the tower, thereby maximizing the packing tower's production capacity and efficiency. Therefore, the internals directly affect the overall operation of the packed tower and the performance of the packing material. Furthermore, the "scale-up effect" of a packed tower is significantly influenced not only by the inherent factors of the packing material itself but also by the internals. When in contact with ordinary chemical media, stainless steel is typically chosen because the internals do not bear the pressure of the container. However, when the internals come into contact with corrosive chemicals, special corrosion-resistant materials, such as TA10, are required to prevent corrosion, ensuring the packed tower achieves its maximum production capacity and efficiency, and guaranteeing its safe and stable operation.

[0003] TA10 material (titanium-molybdenum-nickel alloy), with a nominal composition of Ti-0.3Mo-0.8Ni, is a Ti-12 alloy developed in the United States in the mid-1970s. It is a titanium alloy resistant to crevice corrosion. This alloy has twice the tensile strength of pure titanium at 300℃, significantly improved resistance to corrosion in reducing media, and does not undergo crevice corrosion in chloride environments at 150-200℃. Therefore, it is often used in corrosive environments.

[0004] Currently, the processing of tower internals mainly includes three processes: laser blanking, bending machine bending, and assembly welding. However, during the processing of TA10 tower internals, due to the high hardness and brittleness of TA10 alloy, fractures are very likely to occur, resulting in an extremely low yield.

[0005] In summary, the existing technology for manufacturing TA10 alloy tower internals still has many problems in terms of material cutting, bending, welding efficiency and quality. Therefore, in order to improve the manufacturing quality and work efficiency of TA10 alloy tower internals and reduce the labor intensity of operators, it is necessary to propose a new manufacturing method for TA10 alloy tower internals. Summary of the Invention

[0006] To address the problems of bending and breakage, welding oxidation, and thermal deformation encountered during the processing of TA10 tower internals in existing technologies, this invention provides a method for manufacturing an argon protective shroud and TA10 alloy tower internals, reducing the forming difficulty of TA10 tower internals, improving the processing qualification rate of TA10 tower internals, and increasing the processing efficiency of TA10 tower internals.

[0007] This invention is achieved through the following technical solution:

[0008] An argon gas protective hood includes an argon gas inlet connection device, an argon gas diversion hole, an upper argon gas guide pipe, an argon gas flow refinement device, an upper argon gas distribution hood, and a lower argon gas guide pipe.

[0009] The argon inlet is connected to the upper argon guide pipe and the lower argon guide pipe respectively, and argon diversion holes are provided on the pipe walls of the upper argon guide pipe and the lower argon guide pipe.

[0010] The upper argon gas guide pipe is fitted with an argon gas distribution hood at a horizontal position, and an argon gas flow refinement device is provided at the lower end of the argon gas distribution hood.

[0011] The lower argon gas guide tube is equipped with an argon gas flow refiner.

[0012] Furthermore, the bottom end of the argon gas protective cover is equipped with an anti-rolling device.

[0013] This invention also discloses a method for manufacturing TA10 alloy tower internals, characterized by comprising the following steps:

[0014] (1) Cut the TA10 alloy plate into the required TA10 alloy plate weldment;

[0015] (2) Assemble the above-mentioned argon gas protective cover and airflow refinement welding gun into an argon gas protective cover, introduce argon gas, and use pulse argon arc welding to weld the TA10 alloy plate weldment;

[0016] (3) After welding is completed, continue to introduce argon gas for surging protection.

[0017] Furthermore, the data parameter settings for the pulsed argon arc welding are shown in Table 1:

[0018] Table 1: Data Parameter Settings for Pulsed TIG Welding

[0019]

[0020] Furthermore, the TA10 alloy tower internals are semi-circular liquid guide tubes, which are formed by one-time pressing.

[0021] Furthermore, before welding, the welding wire and the surface of the TA10 alloy plate weldment should be wiped clean with alcohol or acetone, and isolation measures should be taken for the welding wire and the TA10 alloy plate weldment to prevent contamination by iron ions.

[0022] Furthermore, during welding, the distance between the tungsten electrode and the weld bead should not exceed the diameter of the tungsten electrode.

[0023] Furthermore, the ceramic nozzle in the airflow refining welding torch is equipped with a fine mesh screen.

[0024] In this invention, when the argon protective shroud is in use, argon gas is introduced into the argon protective shroud through the argon gas inlet connection device, entering the upper argon gas guide pipe and the lower argon gas guide pipe respectively, and splitting into two argon gas flow streams. The argon gas entering the upper argon gas guide pipe fills the upper argon gas distribution shroud through the argon gas diversion hole on it, and forms a uniform vertical argon gas curtain in the upper part through the argon gas flow refinement device. The other argon gas entering the lower argon gas guide pipe forms a reliable horizontal argon gas curtain through the argon gas diversion hole on it. The ceramic nozzle of the argon arc gun is equipped with a fine mesh to refine the argon gas flow stream. The two gas curtains of the argon protective shroud and the argon gas flow stream of the argon arc gun constitute a continuous gas protective shroud that is completely isolated from the air.

[0025] As an internal component of the tower, the liquid guide tube plays a crucial role in protecting the liquid as it passes through high-velocity and variable-velocity zones and into low-velocity zones within chemical containers, providing optimal gas-liquid distribution for the equipment. To improve the processing efficiency and forming quality of the TA10 liquid guide tube, its structure was optimized based on the properties of TA10 material and its function within the tower. The optimized structure maintains its original performance and allows for pressing with a press instead of bending with a bending machine, improving processing efficiency and yield. The welding method for TA10 alloy was studied, employing pulsed argon arc welding to reduce the average welding current and achieve lower line energy, thereby minimizing the heat-affected zone and welding deformation under the same conditions. During welding, the distance between the tungsten electrode and the weld bead is less than the diameter of the tungsten electrode, effectively controlling this distance. This allows for a more stable and dispersed arc, resulting in uniform heat distribution and preventing deformation and oxidation caused by localized overheating. Simultaneously, ensuring sufficient argon pressure during welding prevents oxidation of the weld pool.

[0026] This invention controls key conditions in the TA10 alloy welding process by designing a pulsed argon arc welding process and an argon gas protective shield for TA10 alloy welding. This results in aesthetically pleasing weld formation with no obvious deformation and a silvery-white weld color, indicating high welding quality. The liquid guide tube in this invention is semi-circular, increasing the flow area by 20% and the number of guide strands from three (as in the triangular tube) to four, which is more conducive to uniform liquid distribution. It is formed in a single pressing process, eliminating the need for bending and solving the problem of easy breakage when bending TA10 material. Furthermore, the semi-circular structure of the liquid guide tube has one less weld seam compared to the triangular tube, saving processing time and facilitating the processing and forming of TA10.

[0027] The beneficial effects achieved by this invention are as follows:

[0028] (1) Breakthrough in TA10 alloy liquid guide tube processing technology: innovative optimization of the TA10 alloy liquid guide tube structure, and replacement of the original bending forming with one-time pressing forming by press, eliminating the problem of easy breakage of TA10 alloy by bending, improving the processing efficiency and qualification rate of TA10 alloy liquid guide tube, and providing a new feasible technical route for the processing of TA10 alloy materials.

[0029] (2) Through the study of the welding process parameters of pulse argon arc welding, this invention has invented a welding process for TA10 alloy by pulse argon arc welding. Compared with ordinary argon arc welding, the welding process of this invention solves the problems of thermal stress concentration and deformation fracture encountered by TA10 alloy in the welding process, and effectively improves the forming quality and welding efficiency of TA10 alloy welding.

[0030] (3) This invention addresses the welding of TA10 alloy by designing an argon gas protective shield and a gas flow refinement welding torch. Compared to ordinary argon arc welding, the argon gas protective shield and gas flow refinement welding torch of this invention can divert the introduced argon gas into an argon gas curtain. Placing the workpiece within the gas curtain provides 360° protection without blind spots. This argon gas protective shield can make the weld of TA10 alloy appear silvery-white, solving the problem of weld oxidation and effectively improving the welding efficiency and appearance quality of TA10 alloy. At the same time, the pass rate of TA10 alloy welded by this combined welding process can reach 99.5%, significantly improving the welding quality of TA10 alloy. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the argon gas protective shield structure;

[0032] Figure 2 This is a schematic diagram of the upper argon gas distribution hood, where A is a vertical cross-sectional view of the upper argon gas distribution hood and B is a horizontal cross-sectional view of the upper argon gas distribution hood.

[0033] 1. Argon inlet connection device, 2. Anti-rolling device, 3. Argon flow divider, 4. Upper argon flow guide pipe, 5. Argon flow refiner, 6. Upper argon distribution hood, 7. Lower argon flow guide pipe. Detailed Implementation

[0034] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] A schematic diagram of the argon gas protective shield structure in this invention is shown below. Figure 1 As shown in the diagram, a cross-sectional view of the upper argon gas guide tube is as follows: Figure 2 As shown, A is a vertical cross-sectional view of the upper argon gas distribution hood, and B is a horizontal cross-sectional view of the upper argon gas distribution hood; Figure 1 and Figure 2 It is known that the argon protective shroud includes an argon inlet connection device 1, an argon diversion hole 3, an upper argon guide pipe 4, an argon flow refiner 5, an upper argon distribution shroud 6, and a lower argon guide pipe 7. An anti-rolling device 2 is provided at the bottom of the argon protective shroud. The argon inlet is connected to the upper argon guide pipe 4 and the lower argon guide pipe 7 respectively. Argon diversion holes 3 are provided on the walls of the upper argon guide pipe 4 and the lower argon guide pipe 7. The argon distribution shroud 6 is horizontally fitted onto the upper argon guide pipe 4. The argon flow refiner 5 is provided at the lower end of the argon distribution shroud 6. The argon flow refiner 5 is fitted onto the lower argon guide pipe 7.

[0037] When in use, argon gas is introduced into the argon gas protective cover through the argon gas inlet connection device 1, and enters the upper argon gas guide pipe 4 and the lower argon gas guide pipe 7 respectively, splitting into two argon gas flow streams. The argon gas entering the upper argon gas guide pipe 4 fills the upper argon gas distribution cover through the argon gas diversion hole 3 on it, and forms a uniform vertical argon gas curtain in the upper part through the argon gas flow refinement device 5. The other argon gas entering the lower argon gas guide pipe 7 forms a reliable horizontal argon gas curtain through the argon gas diversion hole 3 on it. The ceramic nozzle of the argon arc gun is equipped with a fine mesh to refine the argon gas flow stream. The two gas curtains of the argon gas protective cover and the argon gas flow stream of the argon arc gun constitute a continuous gas protective cover that is completely isolated from the air.

[0038] The manufacturing method of the TA10 alloy tower internals will now be described with reference to the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] A method for manufacturing a TA10 alloy tower internal component (δ3mm) includes the following steps:

[0041] (1) Use a 6000W laser digital cutting machine to cut TA10 plate (δ3mm) to obtain the material for the liquid guide tube. After the cutting is completed, transfer it to the press for pressing. Use the press to directly press and form a semi-circular liquid guide tube in one step to obtain TA10 alloy plate weldment. The semi-circular liquid guide tube is formed by pressing in one step without bending, which solves the problem of easy breakage of TA10 material when bending. Note that operators, quality inspectors and designers should use digital calipers and squares to measure the product dimensions respectively. After passing the test, transfer to the welding process.

[0042] (2) Pre-welding preparation: Before welding, wipe the surface of the welding wire and the workpiece clean with alcohol, acetone or other special products; take isolation measures for the welding wire and the workpiece to prevent contamination by iron ions; check that the argon gas source is sufficient and adjust the gas flow rate to 8~15L / min; keep the welding clothes and gloves clean and do not contaminate the base material and welding material; confirm that the wind protection measures are reliable and there is no strong airflow.

[0043] (3) Assemble the drag cover and the airflow refinement welding gun (with fine mesh added to the ceramic nozzle) into an argon gas protective cover, introduce argon gas, and use pulse argon arc welding to weld the TA10 alloy plate weldment. The tungsten electrode diameter is 2.4 mm, and the distance between the tungsten electrode and the weld bead is 2.4 mm during welding. Adjust the parameters of pulse argon arc welding according to Table 1: base current 5A, peak current 160A, duty cycle 0.13, and frequency 2.5HZ.

[0044] (4) After welding is completed, continue to introduce argon gas for gas shielding welding. The gas shielding time is 15s.

[0045] Example 2

[0046] A method for manufacturing a TA10 alloy tower internal component (δ5mm) includes the following steps:

[0047] (1) Use a 6000W laser digital cutting machine to cut TA10 plate (δ5mm) to obtain the material for the liquid guide tube. After the cutting is completed, transfer it to the press for pressing. Use the press to press and form a semi-circular liquid guide tube in one go to obtain the TA10 alloy plate weldment required for the liquid guide tube.

[0048] (2) Pre-welding preparation: Before welding, wipe the surface of the welding wire and the workpiece clean with alcohol, acetone or other special products; take isolation measures for the welding wire and the workpiece to prevent contamination by iron ions; check that the argon gas source is sufficient and adjust the gas flow rate to 8~15L / min; keep the welding clothes and gloves clean and do not contaminate the base material and welding material; confirm that the wind protection measures are reliable and there is no strong airflow.

[0049] (3) Assemble the drag cover and the airflow refinement welding gun (with fine mesh added to the ceramic nozzle) into an argon gas protective cover, introduce argon gas, and use pulse argon arc welding to weld the TA10 alloy plate weldment. The tungsten electrode diameter is 2.4 mm, and the distance between the tungsten electrode and the weld bead is 2.4 mm during welding. Adjust the parameters of pulse argon arc welding according to Table 1: base current 5A, peak current 170A, duty cycle 0.2, frequency 2.2HZ;

[0050] (4) After welding is completed, continue to introduce argon gas for gas shielding welding. The gas shielding time is 15s.

[0051] Comparative Example 1

[0052] Compared with Example 1, after Comparative Example 1 was cut into long strips, the two long strips were assembled into a triangular liquid guide tube and fixed by ordinary argon arc welding. Cracks and oxidation appeared on the surface of the specimen.

[0053] Comparative Example 2

[0054] Compared with Example 1, in Comparative Example 1, after the material was cut, the material plate was bent into an angle and fixed by ordinary argon arc welding.

[0055] Appearance comparison

[0056] Comparing the appearance of Example 1 with Comparative Examples 1 and 2, it was found that: After the liquid guide tube of Comparative Example 1 was formed, it had one more segment weld than Example 1. The weld had cracks and visible deformation. Both the front and back of the weld were yellowish-black and severely oxidized. After the liquid guide tube of Comparative Example 2 was formed, it had one more bend line than Example 1. There were breaks and cracks at the bend line. The weld had cracks and visible deformation. Both the front and back of the weld were yellowish-black and severely oxidized. After the liquid guide tube of Example 1 was formed, it had a smooth appearance, no defects in the weld, no visible deformation, and both the front and back of the surface weld were silvery-white with no oxidation.

Claims

1. A method for manufacturing TA10 alloy tower internals, characterized in that, The TA alloy tower internals are semi-circular liquid guide tubes, manufactured using a one-time pressing process; the manufacturing method includes the following steps: (1) Cut the TA10 alloy plate into the required TA10 alloy plate weldment; (2) Assemble the argon protective cover and the airflow refinement welding gun into an argon protective cover, introduce argon gas, and use pulse argon arc welding to weld the TA10 alloy plate weldment; (3) After welding is completed, continue to introduce argon gas for surging protection; The argon protective shroud includes an argon inlet connection device (1), an argon diversion hole (3), an upper argon guide pipe (4), an argon flow refiner device (5), an upper argon distribution shroud (6), and a lower argon guide pipe (7). The argon inlet is connected to the upper argon guide pipe (4) and the lower argon guide pipe (7) respectively. Argon diversion holes (3) are provided on the pipe walls of the upper argon guide pipe (4) and the lower argon guide pipe (7). The upper argon gas guide pipe (4) is fitted with an argon gas distribution hood (6) at a horizontal position, and an argon gas flow refiner (5) is provided at the lower end of the argon gas distribution hood (6). The lower argon gas guide tube (7) is fitted with an argon gas flow refiner (5); In step (2), after argon gas is introduced, the argon gas enters the upper argon gas guide pipe (4) and the lower argon gas guide pipe (7) of the argon gas protective cover through the argon gas inlet connection device (1). The argon gas entering the upper argon gas guide pipe (4) is filled into the upper argon gas distribution cover (6) through the argon gas diversion hole (3) and forms a uniform vertical argon gas curtain in the upper part through the argon gas flow refinement device (5). The argon gas entering the lower argon gas guide pipe (7) forms a horizontal argon gas curtain through the argon gas diversion hole (3).

2. The method for manufacturing the TA10 alloy tower internals according to claim 1, characterized in that, The bottom of the argon gas protective cover is equipped with an anti-rolling device (2).

3. The method for manufacturing the TA10 alloy tower internals according to claim 1, characterized in that, The data parameters for the pulsed argon arc welding are set as follows: When the thickness of the TA10 alloy plate is 2-4mm, the peak current is 150-200A, the base current is 5A, the duty cycle is 10-20, the frequency is 2.4-3.0Hz, and the post-weld gas delay time is 10-15s. When the thickness of the TA10 alloy plate is 4-6mm, the peak current is 160-200A, the base current is 5A, the duty cycle is 15-25, the frequency is 1.8-2.5Hz, and the post-weld gas delay time is 10-15s. When the thickness of the TA10 alloy plate is 6-10mm, the peak current is 160-200A, the base current is 5A, the duty cycle is 25-60, the frequency is 0.2-1.0Hz, and the post-weld gas delay time is 10-15s.

4. The method for manufacturing the TA10 alloy tower internals according to claim 1, characterized in that, Before welding, wipe the surface of the welding wire and TA10 alloy plate weldment clean with alcohol or acetone, and take isolation measures to prevent contamination by iron ions.

5. The method for manufacturing the TA10 alloy tower internals according to claim 1, characterized in that, During welding, the distance between the tungsten electrode and the weld bead should not be greater than the diameter of the tungsten electrode.

6. The method for manufacturing the TA10 alloy tower internals according to claim 1, characterized in that, The ceramic nozzle of the airflow refinement welding torch is equipped with a fine mesh screen.

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