Welding apparatus for a pump sheath tube based on nickel-based superalloy and welding method thereof

Abstract

The present application relates to the technical field of sheath pipe welding for pump, and particularly relates to a welding device and method for sheath pipe of pump based on nickel-based high-temperature alloy, which comprises a driving part, a fixing part, a first processing part, a second processing part, a first welding part and a second welding part, the driving end of the driving part is connected with the fixing part, the first processing part and the second processing part are both above the fixing part, the first welding part is at one end of the fixing part, the second welding part is above the fixing part, and the first welding part and the second welding part are both at one side of the first processing part and the second processing part. Different welding methods are adopted for different positions of the sheath pipe of pump based on nickel-based high-temperature alloy, and different bevel processing is matched for the welding positions, so that the structural strength of the joint part of the sheath pipe of pump based on nickel-based high-temperature alloy can be improved, and the risk of fracture of the joint part of the sheath pipe of pump based on nickel-based high-temperature alloy can be reduced.

Description

TECHNICAL FIELD

[0001] The application relates to a welding device and method for a pump sheath pipe based on a nickel-based high-temperature alloy. BACKGROUND

[0002] The pump sheath pipe, as a pipe protection component, plays an irreplaceable role in pump equipment, is usually installed around the pump shaft or mechanical seal, is made of metal (for example, stainless steel) or high-performance composite materials, and mainly functions to isolate medium corrosion, reduce friction and wear, prevent particle intrusion, and assist the stable operation of the sealing system. Among many sheath pipe materials, the nickel-based high-temperature alloy stands out due to its excellent performance. The alloy is mainly composed of key elements such as nickel (Ni, >58%), chromium (Cr, 20%-23%), molybdenum (Mo, 8%-10%), and niobium (Nb, 3.15%-4.15%), and has excellent corrosion resistance, high-temperature strength, and oxidation resistance, and is widely used in industrial equipment in extreme environments. Application fields include: 1. Chemical industry: used for protecting pump bodies conveying corrosive media such as strong acid and strong base to ensure long-term stable operation of the equipment; 2. Petroleum and natural gas: protecting pump bodies from corrosion and wear in offshore platforms and land oil fields to reduce maintenance costs; 3. Marine engineering: preventing pump bodies from failing due to salt mist corrosion in harsh environments; 4. Energy industry: protecting pump body components in high-temperature and high-pressure environments to improve equipment reliability.

[0003] Currently, the welding method for the nickel-based high-temperature alloy pump sheath pipe is a multi-layer and multi-pass welding process using all-welded nickel-based alloy welding wire. However, due to the high thermal sensitivity of the nickel-based high-temperature alloy, coarse columnar crystal structures are easily formed after welding, which significantly reduces the mechanical properties of the material. Such defects can seriously threaten the service safety and reliability of the welded structure under high temperature and high pressure. In addition, the nickel-based high-temperature alloy is composed of two metals with different properties (for example, base material layer and nickel-based alloy composite layer). The multi-layer and multi-pass welding process using all-welded nickel-based alloy welding wire forms a "strong-weak" interface between the weld and the base material, which reduces the structural strength of the entire nickel-based high-temperature alloy pump sheath pipe joint part, and easily leads to the fracture of the nickel-based high-temperature alloy pump sheath pipe joint part. In addition, the multi-layer and multi-pass welding process using all-welded nickel-based alloy welding wire has high welding cost, which increases the welding cost of the entire nickel-based high-temperature alloy pump sheath pipe. SUMMARY

[0004] In view of the above-mentioned defects in the prior production technology, the present applicant provides a welding device and method for a pump sheath pipe based on a nickel-based high-temperature alloy, which can improve the structural strength of the entire nickel-based high-temperature alloy pump sheath pipe joint part, reduce the risk of fracture of the nickel-based high-temperature alloy pump sheath pipe joint part, and reduce the welding cost of the entire nickel-based high-temperature alloy pump sheath pipe.

[0005] The technical solutions adopted by the present application are as follows:

[0006] A welding device and method for a pump sheath pipe based on a nickel-based high-temperature alloy, comprising a driving part, a fixing part, a first processing part, a second processing part, a first welding part, and a second welding part. The driving end of the driving part is connected to the fixing part. The fixing part is used to fix the pump sheath pipe based on a nickel-based high-temperature alloy. The driving part is used to drive the fixing part to rotate along the axial direction of the fixing part. The first processing part and the second processing part are both located above the fixing part. The first processing part is used to perform trapezoidal groove processing on the inner wall of the end face of the pump sheath pipe. The second processing part is used to perform U-shaped groove processing on the outer wall of the end face of the pump sheath pipe. The first welding part is located at one end of the fixing part. The second welding part is located above the fixing part. The first welding part and the second welding part are both located on one side of the first processing part and the second processing part. The first welding part is used to perform double-tungsten argon arc welding on the inner wall of the end face of the pump sheath pipe. The second welding part is used to perform single-tungsten argon arc welding on the outer wall of the end face of the pump sheath pipe.

[0007] Therefore, when welding, the inner wall of the nickel-based high-temperature alloy pump sheath pipe is first processed with a trapezoidal groove and then welded with double-tungsten argon arc welding. The outer wall of the nickel-based high-temperature alloy pump sheath pipe is first processed with a U-shaped groove and then welded with single-tungsten argon arc welding. Compared with the existing multi-layer and multi-pass welding method of full-welded nickel-based alloy welding wire, this method has a simple structure and is easy to operate. Different welding methods are used for different positions of the nickel-based high-temperature alloy pump sheath pipe, and different grooves are processed for different welding positions. This can improve the structural strength of the entire nickel-based high-temperature alloy pump sheath pipe joint part, reduce the risk of fracture of the nickel-based high-temperature alloy pump sheath pipe joint part, and thus improve the service life of the nickel-based high-temperature alloy pump sheath pipe after welding. In addition, the double-tungsten argon arc welding of the inner wall and the single-tungsten argon arc welding of the outer wall can effectively improve the weld impact toughness of the joint part after welding of the nickel-based high-temperature alloy pump sheath pipe. At the same time, by improving the welding method, the welding cost of the entire nickel-based high-temperature alloy pump sheath pipe can be reduced.

[0008] As a further improvement to the above technical solution, it also includes: a base and a top plate, the top plate being connected to the base via a support rod; the drive unit being slidably connected to the base; the first processing unit and the second processing unit being slidably connected to the top plate; the first welding unit being connected to the base; and the second welding unit being connected to the top plate. Thus, by using the slidable connection between the drive unit and the base, the nickel-based high-temperature alloy pump sleeve to be welded can be switched back and forth between beveling and welding processes. This allows one set of equipment to simultaneously complete both beveling and welding processes for the nickel-based high-temperature alloy pump sleeve, eliminating the need to disassemble the fixed sleeve. This improves the welding efficiency of the sleeve and reduces the overall production cost of the welding device.

[0009] As a further improvement to the above technical solution: two first processing units are provided. The first processing unit includes: a first telescopic rod, a first slider, a second telescopic rod, and a trapezoidal bevel processing block. The first telescopic rod is connected to the top plate, the telescopic end of the first telescopic rod is connected to the first slider, the second telescopic rod is connected to the first slider, and the trapezoidal bevel processing block is connected to the telescopic end of the second telescopic rod. Therefore, by using two first processing units, trapezoidal beveling can be performed on the end faces of the inner walls on both sides of the nickel-based high-temperature alloy pump sheath simultaneously, thereby improving the processing efficiency of trapezoidal beveling on the nickel-based high-temperature alloy pump sheath. The first telescopic rod is activated so that the trapezoidal beveling processing block is directly above the end face of the nickel-based high-temperature alloy pump sheath. Then, the second telescopic rod is activated to move the trapezoidal beveling processing block downward and abut against the end face of the nickel-based high-temperature alloy pump sheath. Finally, the drive unit is activated to drive the nickel-based high-temperature alloy pump sheath to rotate, and with the cooperation of the trapezoidal beveling processing block, the end face of the nickel-based high-temperature alloy pump sheath is processed with a trapezoidal beveling, so that a trapezoidal bevel is formed on the inner wall of the end face of the nickel-based high-temperature alloy pump sheath.

[0010] As a further improvement to the above technical solution: two second processing units are provided, and the second processing unit is located inside the first processing unit. The second processing unit includes: a second slider, a third telescopic rod, and a U-shaped bevel processing block. The second slider is connected to the first telescopic rod, the third telescopic rod is connected to the second slider, and the U-shaped bevel processing block is connected to the telescopic end of the third telescopic rod. Therefore, by using two second processing units, the end faces of the outer walls on both sides of the nickel-based high-temperature alloy pump sheath can be simultaneously processed into U-shaped bevels, thereby improving the processing efficiency of the U-shaped bevel processing of the nickel-based high-temperature alloy pump sheath. The first telescopic rod is activated so that the U-shaped bevel processing block is directly above the end face of the nickel-based high-temperature alloy pump sheath. Then, the third telescopic rod is activated to drive the U-shaped bevel processing block to move downward and abut against the end face of the nickel-based high-temperature alloy pump sheath. Finally, the drive unit is activated to drive the nickel-based high-temperature alloy pump sheath to rotate, and with the cooperation of the U-shaped bevel processing block, the end face of the nickel-based high-temperature alloy pump sheath is processed into a U-shaped bevel, so that the outer wall of the end face of the nickel-based high-temperature alloy pump sheath is formed into a U-shaped bevel.

[0011] As a further improvement to the above technical solution: the first welding part includes a support frame, a fourth telescopic rod, and a first welding gun. The support frame is connected to the base, the fourth telescopic rod is connected to the support frame, and the first welding gun is connected to the telescopic end of the fourth telescopic rod. Thus, the fourth telescopic rod is activated to move the first welding gun to the welding point on the inner walls of the two nickel-based high-temperature alloy pump sheaths. Then, the drive unit is activated to drive the nickel-based high-temperature alloy pump sheaths to rotate, and with the cooperation of the first welding gun, double tungsten inert gas welding is performed on the inner wall of the end face of the nickel-based high-temperature alloy pump sheath.

[0012] As a further improvement to the above technical solution: the second welding part includes a fifth telescopic rod and a second welding gun. The fifth telescopic rod is connected to the top plate, and the second welding gun is connected to the telescopic end of the fifth telescopic rod. Thus, the fifth telescopic rod is activated to move the second welding gun to the welding point on the outer walls of the two nickel-based high-temperature alloy pump sheaths. Then, the drive unit is activated to drive the nickel-based high-temperature alloy pump sheaths to rotate, and with the cooperation of the second welding gun, single tungsten inert gas (TIG) welding is performed on the outer wall of the end face of the nickel-based high-temperature alloy pump sheath.

[0013] As a further improvement to the above technical solution: Two fixing parts are provided, each used to fix two nickel-based high-temperature alloy pump sheaths. Each fixing part includes a fixing ring, a first fixing block, a second fixing block, and an adjusting rod. The fixing ring is connected to the driving end of the driving unit. The first fixing block and the second fixing block are both located inside the fixing ring, with the first fixing block located on the side of the fixing ring closer to the base, and the second fixing block located on the side of the fixing ring closer to the top plate. The adjusting rod passes through the fixing ring and is threadedly connected to it. The adjusting rod is rotatably connected to the second fixing block. The driving unit includes two... The system comprises a driving unit, a fixed base, and a sixth telescopic rod. The driving end of the driving unit is connected to the fixed ring, the driving unit is connected to the fixed base, the fixed base is slidably connected to the base, the sixth telescopic rod is connected to the base, and the telescopic end of the sixth telescopic rod is connected to the fixed base. The driving unit includes a driving component, a first gear, a second gear, and a support block. The driving component is connected to the fixed base, the first gear is connected to the driving end of the driving component, the second gear meshes with the first gear, the second gear is sleeved on the outside of the fixed ring, the support block is rotatably connected to the fixed ring, and the support block is connected to the fixed base. Therefore, since the first fixing block is directly installed inside the fixing ring, when fixing the nickel-based high-temperature alloy pump sheath, the two nickel-based high-temperature alloy pump sheaths are placed directly on the two first fixing blocks to ensure that the two nickel-based high-temperature alloy pump sheaths are on the same axis. In this way, the end faces of the two nickel-based high-temperature alloy pump sheaths can be completely overlapped and aligned without any offset. During welding, the two nickel-based high-temperature alloy pump sheaths will not be misaligned, thereby improving the welding quality of the two nickel-based high-temperature alloy pump sheaths. During fixing, the nickel-based high-temperature alloy pump sheath to be fixed is first placed on the first fixing block. Finally, rotate the adjusting rod to move the second fixing block closer to the first fixing block. Through the cooperation of the first and second fixing blocks, the sheath of the nickel-based high-temperature alloy pump is clamped and fixed. Start the drive unit, which drives the first gear to rotate, causing the second gear to rotate, which in turn drives the fixing ring to rotate, causing the sheath of the nickel-based high-temperature alloy pump to rotate. When the sheath of the nickel-based high-temperature alloy pump rotates one revolution, the trapezoidal bevel machining, U-shaped bevel machining, double tungsten inert gas welding of the inner wall, and single tungsten inert gas welding of the outer wall of the sheath of the nickel-based high-temperature alloy pump can be realized.

[0014] A welding method for a pump sheathing tube based on a nickel-based high-temperature alloy includes the following steps:

[0015] S1. Trapezoidal bevel machining of the inner wall of the end face of the pump casing made of nickel-based high-temperature alloy;

[0016] S2, U-shaped bevel machining of the outer wall of the end face of the pump casing made of nickel-based high-temperature alloy;

[0017] S3. Perform double tungsten inert gas welding on the trapezoidal bevel of the pump casing substrate layer of two nickel-based high-temperature alloys.

[0018] S4. Perform single tungsten inert gas welding on the U-shaped bevel of the transition layer of the pump casing of two nickel-based high-temperature alloys.

[0019] S5. Perform single tungsten inert gas welding on the nickel-based alloy composite layer of the pump casing of two nickel-based high-temperature alloys.

[0020] As a further improvement to the above technical solution: In S5, the single tungsten inert gas welding wire for nickel-based alloy composite material layer is a high-temperature nickel-based alloy welding wire.

[0021] As a further improvement to the above technical solution: In S5, the surface of the high-temperature nickel-based alloy welding wire is sequentially cleaned, ground, and polished to deposit a nickel layer and a niobium carbide layer on its surface. Thus, by sequentially cleaning, grinding, and polishing the surface of the high-temperature nickel-based alloy welding wire, a high degree of cleanliness and roughness of the nickel-based alloy composite layer can be ensured. Furthermore, the nickel layer, acting as a buffer layer, effectively alleviates thermal stress and improves the bonding strength between the electrodeposited layer and the nickel-based alloy composite layer during single tungsten inert gas welding of the nickel-based alloy composite layer. The nickel layer also improves the conductivity of the high-temperature nickel-based alloy welding wire and enhances arc stability. The niobium carbide layer possesses extremely high hardness and thermal stability, significantly improving the high-temperature nickel-based alloy welding wire's resistance to hot cracking, as well as its high-temperature strain tolerance and high-temperature creep strength. This ensures the overall performance of the nickel-based high-temperature alloy pump sheath. Simultaneously, by strengthening the surface of the high-temperature nickel-based alloy welding wire, the structural strength of the joint portion of the nickel-based high-temperature alloy pump sheath can be improved while significantly reducing welding costs.

[0022] The beneficial effects of this invention are as follows:

[0023] During welding, the inner wall of the nickel-based high-temperature alloy pump sheath is first beveled and then subjected to double tungsten inert gas (TIG) welding, while the outer wall is first beveled and then subjected to single TIG welding. Compared with the existing multi-layer, multi-pass welding method using full-seam nickel-based alloy welding wire, this method is simpler in structure and easier to operate. By using different welding methods for different positions of the nickel-based high-temperature alloy pump sheath, and coordinating different bevel treatments for different welding positions, the structural strength of the entire joint of the nickel-based high-temperature alloy pump sheath can be improved, thereby reducing the risk of fracture of the joint and extending the service life of the nickel-based high-temperature alloy pump sheath after welding. In addition, the combination of double TIG welding on the inner wall and single TIG welding on the outer wall can effectively improve the weld impact toughness of the joint after welding. At the same time, by improving the welding method, the overall welding cost of the nickel-based high-temperature alloy pump sheath can be reduced.

[0024] The present invention also includes the following advantages:

[0025] 1. This invention, through the sliding connection between the drive unit and the base, enables the nickel-based high-temperature alloy pump sheath to be switched between beveling and welding processes. This allows a single set of equipment to simultaneously complete both beveling and welding processes for the nickel-based high-temperature alloy pump sheath without disassembling the fixed sheath. This improves the welding efficiency of the nickel-based high-temperature alloy pump sheath and reduces the overall production cost of the welding device.

[0026] 2. The present invention can simultaneously perform trapezoidal beveling on the end faces of the inner walls on both sides of the sheath tube for nickel-based high-temperature alloy pumps through two first processing parts, thereby improving the processing efficiency of trapezoidal beveling on the sheath tube for nickel-based high-temperature alloy pumps; and can simultaneously perform U-shaped beveling on the end faces of the outer walls on both sides of the sheath tube for nickel-based high-temperature alloy pumps through two second processing parts, thereby improving the processing efficiency of U-shaped beveling on the sheath tube for nickel-based high-temperature alloy pumps.

[0027] 3. This invention, by sequentially cleaning, grinding, and polishing the surface of the high-temperature nickel-based alloy welding wire, ensures that the surface of the nickel-based alloy composite layer has high cleanliness and roughness. Furthermore, the nickel layer, acting as a buffer layer, effectively alleviates thermal stress during single tungsten inert gas (TIG) welding of the nickel-based alloy composite layer, improving the bonding strength between the electrodeposited layer and the nickel-based alloy composite layer. The nickel layer also enhances the conductivity of the high-temperature nickel-based alloy welding wire and improves arc stability. The niobium carbide layer possesses extremely high hardness and thermal stability, significantly improving the high-temperature nickel-based alloy welding wire's resistance to hot cracking, as well as its high-temperature strain tolerance and high-temperature creep strength. This ensures the overall performance of the nickel-based high-temperature alloy pump sheath. Simultaneously, by strengthening the surface of the high-temperature nickel-based alloy welding wire, the structural strength of the joint portion of the nickel-based high-temperature alloy pump sheath can be improved while significantly reducing welding costs. Attached Figure Description

[0028] Figure 1 This is a first-view structural schematic diagram of the welding device for the pump sheath tube based on nickel-based high-temperature alloy of the present invention.

[0029] Figure 2 This is a first-view structural schematic diagram of the welding device for the pump sheath tube based on nickel-based high-temperature alloy of the present invention.

[0030] Figure 3 This is a schematic diagram of the structure in which the first processing unit and the second processing unit of the present invention are installed;

[0031] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of a local structure at point A;

[0032] Figure 5 This is a schematic diagram of the structure of the first welding part of the present invention;

[0033] Figure 6 This is a schematic diagram of the structure of the second welding part of the present invention;

[0034] Figure 7 This is a schematic diagram of the installation of the driving part and the fixing part of the present invention;

[0035] Figure 8 This is a schematic diagram of the pump sheath of the nickel-based high-temperature alloy of the present invention;

[0036] Figure 9 For the present invention Figure 8 Enlarged schematic diagram of the local structure at point B;

[0037] Figure 10 This is a flowchart of the welding method for the welding apparatus of the pump sheath tube based on nickel-based high-temperature alloy of the present invention.

[0038] Among them: 1. Drive unit;

[0039] 101. Drive unit; 1011. Drive component; 1012. First gear; 1013. Second gear; 1014. Support block; 102. Fixing base; 103. Sixth telescopic rod;

[0040] 2. Fixing part;

[0041] 201. Fixing ring; 202. First fixing block; 203. Second fixing block; 204. Adjusting rod;

[0042] 3. First Processing Department;

[0043] 301. First telescopic rod; 302. First slider; 303. Second telescopic rod; 304. Trapezoidal bevel processing block;

[0044] 4. Second processing department;

[0045] 401. Second slider; 402. Third telescopic rod; 403. U-shaped bevel processing block;

[0046] 5. First welding section;

[0047] 501. Support frame; 502. Fourth telescopic rod; 503. First welding gun;

[0048] 6. Second welding section;

[0049] 601. Fifth telescopic rod; 602. Second welding gun;

[0050] 7. Base;

[0051] 8. Top plate; 801. Support rod. Detailed Implementation

[0052] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0053] like Figures 1 to 9As shown, a welding device for a pump sheathing tube based on a nickel-based superalloy includes: a driving unit 1, a fixing unit 2, a first processing unit 3, a second processing unit 4, a first welding unit 5, and a second welding unit 6. The driving end of the driving unit 1 is connected to the fixing unit 2. The fixing unit 2 is used to fix the nickel-based superalloy pump sheathing tube. The driving unit 1 is used to drive the fixing unit 2 to rotate along the axial direction of the fixing unit 2. The first processing unit 3 and the second processing unit 4 are both located above the fixing unit 2, and the first processing unit 3 is used for... The inner wall of the pump casing end face is beveled in a trapezoidal shape. The second processing part 4 is used to bevel the outer wall of the pump casing end face in a U-shape. The first welding part 5 is located at one end of the fixing part 2, and the second welding part 6 is located above the fixing part 2. Both the first welding part 5 and the second welding part 6 are located on one side of the first processing part 3 and the second processing part 4. The first welding part 5 is used to perform double tungsten inert gas welding on the inner wall of the pump casing end face, and the second welding part 6 is used to perform single tungsten inert gas welding on the outer wall of the pump casing end face. Therefore, during welding, the inner wall of the nickel-based high-temperature alloy pump sheath is first beveled and then subjected to double tungsten inert gas (TIG) welding, while the outer wall is first beveled and then subjected to single TIG welding. Compared to the existing multi-layer, multi-pass welding method using nickel-based alloy welding wire with a full weld seam, this method is simpler in structure and easier to operate. By using different welding methods for different positions of the nickel-based high-temperature alloy pump sheath, and coordinating different bevel treatments for the welding positions, the structural strength of the entire joint of the nickel-based high-temperature alloy pump sheath can be improved, thereby reducing the risk of fracture of the joint and extending the service life of the nickel-based high-temperature alloy pump sheath after welding. In addition, the combination of double TIG welding on the inner wall and single TIG welding on the outer wall can effectively improve the weld impact toughness of the joint after welding. At the same time, by improving the welding method, the overall welding cost of the nickel-based high-temperature alloy pump sheath can be reduced.

[0054] In this embodiment, the system further includes: a base 7 and a top plate 8, with the top plate 8 connected to the base 7 via a support rod 801; a drive unit 1 slidably connected to the base 7; a first processing unit 3 and a second processing unit 4 slidably connected to the top plate 8; a first welding unit 5 connected to the base 7; and a second welding unit 6 connected to the top plate 8. Thus, by slidingly connecting the drive unit 1 to the base 7, the nickel-based high-temperature alloy pump sleeve to be welded can be switched back and forth between beveling and welding processes. This allows a single piece of equipment to simultaneously complete both beveling and welding processes for the nickel-based high-temperature alloy pump sleeve, eliminating the need to disassemble the fixed sleeve. This improves the welding efficiency of the sleeve and reduces the overall production cost of the welding device.

[0055] In this embodiment, there are two first processing units 3. The first processing unit 3 includes: a first telescopic rod 301, a first slider 302, a second telescopic rod 303, and a trapezoidal bevel processing block 304. The first telescopic rod 301 is connected to the top plate 8. The telescopic end of the first telescopic rod 301 is connected to the first slider 302. The second telescopic rod 303 is connected to the first slider 302. The trapezoidal bevel processing block 304 is connected to the telescopic end of the second telescopic rod 303. Therefore, by using two first processing units 3, trapezoidal beveling can be performed on the end faces of the inner walls on both sides of the nickel-based high-temperature alloy pump sheath tube simultaneously, thereby improving the processing efficiency of trapezoidal beveling on the nickel-based high-temperature alloy pump sheath tube. The first telescopic rod 301 is activated so that the trapezoidal beveling processing block 304 is directly above the end face of the nickel-based high-temperature alloy pump sheath tube. Then, the second telescopic rod 303 is activated to drive the trapezoidal beveling processing block 304 to move downward and abut against the end face of the nickel-based high-temperature alloy pump sheath tube. Finally, the drive unit 1 is activated to drive the nickel-based high-temperature alloy pump sheath tube to rotate. With the cooperation of the trapezoidal beveling processing block 304, the end face of the nickel-based high-temperature alloy pump sheath tube is processed with a trapezoidal beveling, so that a trapezoidal bevel is formed on the inner wall of the end face of the nickel-based high-temperature alloy pump sheath tube.

[0056] In this embodiment, there are two second processing units 4, and the second processing unit 4 is located inside the first processing unit 3. The second processing unit 4 includes: a second slider 401, a third telescopic rod 402, and a U-shaped bevel processing block 403. The second slider 401 is connected to the first telescopic rod 301, the third telescopic rod 402 is connected to the second slider 401, and the U-shaped bevel processing block 403 is connected to the telescopic end of the third telescopic rod 402. Therefore, by using two second processing units 4, the end faces of the outer walls on both sides of the nickel-based high-temperature alloy pump sheath can be simultaneously processed into U-shaped bevels, thereby improving the processing efficiency of the U-shaped bevel processing of the nickel-based high-temperature alloy pump sheath. The first telescopic rod 301 is activated so that the U-shaped bevel processing block 403 is directly above the end face of the nickel-based high-temperature alloy pump sheath. Then, the third telescopic rod 402 is activated to drive the U-shaped bevel processing block 403 to move downward and abut against the end face of the nickel-based high-temperature alloy pump sheath. Finally, the drive unit 1 is activated to drive the nickel-based high-temperature alloy pump sheath to rotate, and with the cooperation of the U-shaped bevel processing block 403, the end face of the nickel-based high-temperature alloy pump sheath is processed into a U-shaped bevel, so that the outer wall of the end face of the nickel-based high-temperature alloy pump sheath is formed into a U-shaped bevel.

[0057] It should be noted that: such as Figure 4 , 9As shown, both the trapezoidal bevel processing block 304 and the U-shaped bevel processing block 403 consist of a connecting section and a processing section. The processing section is used for bevel processing. The cross-sectional shape of the processing section of the trapezoidal bevel processing block 304 is 1 / 2 trapezoidal. The end faces of the two sections of nickel-based high-temperature alloy pump sheathing tubes abut against each other to form a trapezoidal bevel. The cross-sectional shape of the processing section of the U-shaped bevel processing block 403 is 1 / 2 U-shaped. The end faces of the two sections of nickel-based high-temperature alloy pump sheathing tubes abut against each other to form a U-shaped bevel.

[0058] In this embodiment, the first welding part 5 includes a support frame 501, a fourth telescopic rod 502, and a first welding gun 503. The support frame 501 is connected to the base 7, the fourth telescopic rod 502 is connected to the support frame 501, and the first welding gun 503 is connected to the telescopic end of the fourth telescopic rod 502. Thus, the fourth telescopic rod 502 is activated to move the first welding gun 503 to the welding point on the inner wall of the two nickel-based high-temperature alloy pump sheaths. Then, the drive unit 1 is activated to drive the nickel-based high-temperature alloy pump sheaths to rotate, and with the cooperation of the first welding gun 503, double tungsten inert gas welding is performed on the inner wall of the end face of the nickel-based high-temperature alloy pump sheath.

[0059] In this embodiment, the second welding section 6 includes a fifth telescopic rod 601 and a second welding gun 602. The fifth telescopic rod 601 is connected to the top plate 8, and the second welding gun 602 is connected to the telescopic end of the fifth telescopic rod 601. Thus, the fifth telescopic rod 601 is activated to move the second welding gun 602 to the welding point on the outer walls of the two nickel-based high-temperature alloy pump sheaths. Then, the drive unit 1 is activated to drive the nickel-based high-temperature alloy pump sheaths to rotate, and with the cooperation of the second welding gun 602, single tungsten inert gas welding is performed on the outer wall of the end face of the nickel-based high-temperature alloy pump sheath.

[0060] In this embodiment, two fixing parts 2 are provided. The two fixing parts 2 are used to fix two nickel-based high-temperature alloy pump sheaths. The fixing part 2 includes: a fixing ring 201, a first fixing block 202, a second fixing block 203, and an adjusting rod 204. The fixing ring 201 is connected to the driving end of the driving part 1. The first fixing block 202 and the second fixing block 203 are both located inside the fixing ring 201. The first fixing block 202 is located on the side of the fixing ring 201 closer to the base 7, and the second fixing block 203 is located on the side of the fixing ring 201 closer to the top plate 8. The adjusting rod 204 passes through the fixing ring 201 and is threadedly connected to the fixing ring 201. The adjusting rod 204 is rotatably connected to the second fixing block 203. The driving part 1 includes: two driving units 101, a fixing base 102, and a sixth telescopic rod 1. 03. The driving end of the driving unit 101 is connected to the fixed ring 201. The driving unit 101 is connected to the fixed seat 102. The fixed seat 102 is slidably connected to the base 7. The sixth telescopic rod 103 is connected to the base 7. The telescopic end of the sixth telescopic rod 103 is connected to the fixed seat 102. The driving unit 101 includes: a driving component 1011, a first gear 1012, a second gear 1013, and a support block 1014. The driving component 1011 is connected to the fixed seat 102. The first gear 1012 is connected to the driving end of the driving component 1011. The second gear 1013 meshes with the first gear 1012. The second gear 1013 is sleeved on the outside of the fixed ring 201. The support block 1014 is rotatably connected to the fixed ring 201. The support block 1014 is connected to the fixed seat 102. Therefore, since the first fixing block 202 is directly installed inside the fixing ring 201, when fixing the nickel-based high-temperature alloy pump sheath, the two nickel-based high-temperature alloy pump sheaths are placed directly on the two first fixing blocks 202 to ensure that the two nickel-based high-temperature alloy pump sheaths are on the same axis. In this way, the end faces of the two nickel-based high-temperature alloy pump sheaths can be completely overlapped and aligned without any offset. During welding, the two nickel-based high-temperature alloy pump sheaths will not be misaligned, thereby improving the welding quality of the two nickel-based high-temperature alloy pump sheaths. When fixing, first place the nickel-based high-temperature alloy pump sheath to be fixed on the first fixing block 202, and finally rotate the adjusting rod 2. 04. The second fixing block 203 is moved closer to the first fixing block 202. The first fixing block 202 and the second fixing block 203 cooperate to clamp and fix the sheath tube for the nickel-based high-temperature alloy pump. The drive component 1011 is started, which drives the first gear 1012 to rotate, so that the second gear 1013 rotates, which in turn drives the fixing ring 201 to rotate, so that the sheath tube for the nickel-based high-temperature alloy pump rotates. When the sheath tube for the nickel-based high-temperature alloy pump rotates one revolution, the trapezoidal bevel processing, U-shaped bevel processing, double tungsten inert gas welding of the inner wall, and single tungsten inert gas welding of the outer wall of the sheath tube for the nickel-based high-temperature alloy pump can be realized.

[0061] For example, the drive unit 1011 uses a motor.

[0062] The welding process of the nickel-based high-temperature alloy pump sheath tube of the present invention is as follows: First, the two nickel-based high-temperature alloy pump sheath tubes to be welded are fixed by two fixing parts 2 respectively; then, through the cooperation of the driving part 1 and the first processing part 3, the inner walls of the end faces of the two nickel-based high-temperature alloy pump sheath tubes are respectively processed by trapezoidal beveling (at this time, the two nickel-based high-temperature alloy pump sheath tubes are not in contact, and the two nickel-based high-temperature alloy pump sheath tubes are located in the area where the first processing part 3 and the second processing part 4 are located); then, through the driving part 1 In coordination with the second processing unit 4 (the lateral movement of the U-shaped bevel processing block 403 is still achieved through the first telescopic rod 301 of the first processing unit 3), U-shaped bevel processing is performed on the outer walls of the end faces of the two nickel-based high-temperature alloy pump sheaths; then, the sixth telescopic rod 103 moves the nickel-based high-temperature alloy pump sheaths to the area where the first welding unit 5 and the second welding unit 6 are located, and the fixing unit 2 adjusts the two nickel-based high-temperature alloy pump sheaths to abut against each other; then, the fourth telescopic rod 502 is activated. The process involves several steps: First, the first welding torch 503 is positioned at the welding location. Then, the drive unit 1011 is activated, rotating the nickel-based high-temperature alloy pump sheath tube one revolution (the first revolution). With the assistance of the first welding torch 503, double tungsten inert gas (TIG) welding is performed on the trapezoidal bevel (i.e., the substrate layer) of the inner wall of the nickel-based high-temperature alloy pump sheath tube. Finally, the fifth telescopic rod 601 is activated, positioning the second welding torch 602 at the welding location. Then, the drive unit 1011 is activated again, rotating the nickel-based high-temperature alloy pump sheath tube one revolution (the first revolution). The sheath tube of the nickel-based high-temperature alloy pump rotates once (the second rotation), and with the cooperation of the first welding gun 503, the U-shaped bevel (i.e., transition layer) of the outer wall of the end face of the sheath tube of the nickel-based high-temperature alloy pump is subjected to single tungsten inert gas welding. Then, the sheath tube of the nickel-based high-temperature alloy pump is driven to rotate once again by the drive component 1011 (the third rotation), and with the cooperation of the first welding gun 503, at the same time, high-temperature nickel-based alloy welding wire is used to perform single tungsten inert gas welding on the outer wall of the end face of the sheath tube of the nickel-based high-temperature alloy pump (i.e., nickel-based alloy composite material layer).

[0063] like Figure 10 As shown, a welding method for a welding apparatus for a pump sheath based on a nickel-based high-temperature alloy includes the following steps:

[0064] S1. Trapezoidal bevel machining of the inner wall of the end face of the pump casing made of nickel-based high-temperature alloy;

[0065] S2, U-shaped bevel machining of the outer wall of the end face of the pump casing made of nickel-based high-temperature alloy;

[0066] S3. Perform double tungsten inert gas welding on the trapezoidal bevel of the pump casing substrate layer of two nickel-based high-temperature alloys.

[0067] S4. Perform single tungsten inert gas welding on the U-shaped bevel of the transition layer of the pump casing of two nickel-based high-temperature alloys.

[0068] S5. Perform single tungsten inert gas welding on the nickel-based alloy composite layer of the pump casing of two nickel-based high-temperature alloys.

[0069] In this embodiment, in S5, the nickel-based alloy composite material layer single tungsten inert gas welding wire is a high-temperature nickel-based alloy welding wire. The surface of the high-temperature nickel-based alloy welding wire is sequentially cleaned, ground, and polished to deposit a nickel layer and a niobium carbide layer on the surface of the high-temperature nickel-based alloy welding wire. Therefore, by sequentially cleaning, grinding, and polishing the surface of the high-temperature nickel-based alloy welding wire, a high degree of cleanliness and roughness of the nickel-based alloy composite layer surface can be ensured. Furthermore, the nickel layer, acting as a buffer layer, effectively alleviates thermal stress and improves the bonding strength between the electrodeposited layer and the nickel-based alloy composite layer during single tungsten inert gas welding. The nickel layer also enhances the conductivity of the high-temperature nickel-based alloy welding wire and improves arc stability. The niobium carbide layer possesses extremely high hardness and thermal stability, significantly improving the high-temperature nickel-based alloy welding wire's resistance to hot cracking, as well as its high-temperature strain tolerance and high-temperature creep strength. This ensures the overall performance of the nickel-based high-temperature alloy pump sheath. Simultaneously, by strengthening the surface of the high-temperature nickel-based alloy welding wire, the structural strength of the joint portion of the nickel-based high-temperature alloy pump sheath can be improved while significantly reducing welding costs.

[0070] For example, the high-temperature nickel-based alloy welding wire used is ERNiCrMo-3.

[0071] In summary, this invention, during welding, first performs trapezoidal beveling on the inner wall of the nickel-based high-temperature alloy pump sheath before employing double tungsten inert gas (TIG) welding, and first performs U-shaped beveling on the outer wall before employing single TIG welding. Compared to the existing multi-layer, multi-pass welding method using nickel-based alloy welding wire with a full weld seam, this method is simpler in structure and easier to operate. By employing different welding methods for different positions of the nickel-based high-temperature alloy pump sheath, and coordinating different beveling treatments for the welding positions, the structural strength of the entire joint of the nickel-based high-temperature alloy pump sheath can be improved, thereby reducing the risk of fracture in the joint and extending the service life of the nickel-based high-temperature alloy pump sheath after welding. Furthermore, the combination of double TIG welding on the inner wall and single TIG welding on the outer wall effectively improves the weld impact toughness of the joint after welding. At the same time, by improving the welding method, the overall welding cost of the nickel-based high-temperature alloy pump sheath can be reduced.

[0072] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A welding device for pump sheathing pipes based on nickel-based high-temperature alloys, characterized in that, include: The driving part (1) and the fixing part (2) are connected to the driving end of the driving part (1) and the fixing part (2). The fixing part (2) is used to fix the pump sleeve of nickel-based high temperature alloy. The driving part (1) is used to drive the fixing part (2) to rotate along the axial direction of the fixing part (2). The first processing part (3) and the second processing part (4) are both located above the fixing part (2). The first processing part (3) is used to perform trapezoidal bevel processing on the inner wall of the pump sheath pipe end face, and the second processing part (4) is used to perform U-shaped bevel processing on the outer wall of the pump sheath pipe end face. The first welding part (5) and the second welding part (6) are located at one end of the fixing part (2) and above the fixing part (2). The first welding part (5) and the second welding part (6) are both located on one side of the first processing part (3) and the second processing part (4). The first welding part (5) is used to perform double tungsten inert gas welding on the inner wall of the pump sheath tube end face, and the second welding part (6) is used to perform single tungsten inert gas welding on the outer wall of the pump sheath tube end face.

2. The welding apparatus for pump sheathing pipe based on nickel-based high-temperature alloy as described in claim 1, characterized in that: Also includes: A base (7) and a top plate (8), wherein the top plate (8) is connected to the base (7) by a support rod (801); The driving part (1) is slidably connected to the base (7), the first processing part (3) and the second processing part (4) are slidably connected to the top plate (8), the first welding part (5) is connected to the base (7), and the second welding part (6) is connected to the top plate (8).

3. The welding apparatus for pump sheathing pipe based on nickel-based high-temperature alloy as described in claim 2, characterized in that: There are two first processing units (3), and each first processing unit (3) includes: The system comprises a first telescopic rod (301), a first slider (302), a second telescopic rod (303), and a trapezoidal bevel processing block (304). The first telescopic rod (301) is connected to the top plate (8), the telescopic end of the first telescopic rod (301) is connected to the first slider (302), the second telescopic rod (303) is connected to the first slider (302), and the trapezoidal bevel processing block (304) is connected to the telescopic end of the second telescopic rod (303).

4. The welding apparatus for pump sheathing pipe based on nickel-based high-temperature alloy as described in claim 3, characterized in that: There are two second processing units (4), and each second processing unit (4) includes: The system comprises a second slider (401), a third telescopic rod (402), and a U-shaped bevel processing block (403). The second slider (401) is connected to the first telescopic rod (301), the third telescopic rod (402) is connected to the second slider (401), and the U-shaped bevel processing block (403) is connected to the telescopic end of the third telescopic rod (402).

5. The welding apparatus for pump sheathing pipe based on nickel-based high-temperature alloy as described in claim 2, characterized in that: The first welded part (5) includes: The support frame (501), the fourth telescopic rod (502), and the first welding gun (503) are connected to the base (7), the fourth telescopic rod (502) is connected to the support frame (501), and the first welding gun (503) is connected to the telescopic end of the fourth telescopic rod (502).

6. The welding apparatus for pump sheathing pipe based on nickel-based high-temperature alloy as described in claim 2, characterized in that: The second welded part (6) includes: The fifth telescopic rod (601) and the second welding gun (602) are connected to the top plate (8), and the second welding gun (602) is connected to the telescopic end of the fifth telescopic rod (601).

7. The welding apparatus for pump sheathing pipe based on nickel-based high-temperature alloy as described in claim 2, characterized in that: There are two fixing parts (2), and the two fixing parts (2) are respectively used to fix two nickel-based high-temperature alloy pump sleeves. The fixing part (2) includes: The assembly includes a fixed ring (201), a first fixed block (202), a second fixed block (203), and an adjusting rod (204). The fixed ring (201) is connected to the driving end of the driving unit (1). The first fixed block (202) and the second fixed block (203) are both located inside the fixed ring (201). The first fixed block (202) is located on the side of the fixed ring (201) closer to the base (7), and the second fixed block (203) is located on the side of the fixed ring (201) closer to the top plate (8). The adjusting rod (204) passes through the fixed ring (201) and is threadedly connected to the fixed ring (201). The adjusting rod (204) is rotatably connected to the second fixed block (203). The drive unit (1) includes: Two drive units (101), a fixed base (102), and a sixth telescopic rod (103). The drive end of the drive unit (101) is connected to the fixed ring (201). The drive unit (101) is connected to the fixed base (102). The fixed base (102) is slidably connected to the base (7). The sixth telescopic rod (103) is connected to the base (7). The telescopic end of the sixth telescopic rod (103) is connected to the fixed base (102). The drive unit (101) includes: The device comprises a drive component (1011), a first gear (1012), a second gear (1013), and a support block (1014). The drive component (1011) is connected to the fixed base (102). The first gear (1012) is connected to the drive end of the drive component (1011). The second gear (1013) meshes with the first gear (1012) and is sleeved on the outside of the fixed ring (201). The support block (1014) is rotatably connected to the fixed ring (201) and is connected to the fixed base (102).

8. A welding method for a welding apparatus for a pump sheathing tube based on a nickel-based high-temperature alloy as described in any one of claims 1-7, characterized in that: Includes the following steps: S1. Trapezoidal bevel machining of the inner wall of the end face of the pump casing made of nickel-based high-temperature alloy; S2, U-shaped bevel machining of the outer wall of the end face of the pump casing made of nickel-based high-temperature alloy; S3. Perform double tungsten inert gas welding on the trapezoidal bevel of the pump casing substrate layer of two nickel-based high-temperature alloys. S4. Perform single tungsten inert gas welding on the U-shaped bevel of the transition layer of the pump casing of two nickel-based high-temperature alloys. S5. Perform single tungsten inert gas welding on the nickel-based alloy composite layer of the pump casing of two nickel-based high-temperature alloys.

9. The welding method of the welding apparatus for pump sheathing pipe based on nickel-based high-temperature alloy as described in claim 8, characterized in that: In S5, the nickel-based alloy composite layer single tungsten inert gas welding wire adopts high-temperature nickel-based alloy welding wire.

10. The welding method of the welding apparatus for pump sheathing pipe based on nickel-based high-temperature alloy as described in claim 9, characterized in that: In S5, the surface of the high-temperature nickel-based alloy welding wire is sequentially cleaned, ground, and polished to deposit a nickel layer and a niobium carbide layer on the surface of the high-temperature nickel-based alloy welding wire.

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