Welding device and welding method of nickel-based superalloy-based protective casing pipe for pump

Abstract

The invention relates to the technical field of welding of protective sleeves for pumps, in particular to a welding device and a welding method of a protective sleeve for a pump based on nickel-based superalloy.The welding device comprises a driving part, a fixing part, a first machining part, a second machining part, a first welding part and a second welding part, and the driving end of the driving part is connected with the fixing part; the first machining part and the second machining part are both located above the fixing part, the first welding part is located at one end of the fixing part, the second welding part is located above the fixing part, and the first welding part and the second welding part are both located on one side of the first machining part and one side of the second machining part. Different welding modes are adopted for different positions of the sheath pipe for the nickel-based high-temperature alloy pump, and different groove treatment is performed on the welding positions in a matched manner, so that the structural strength of the pipe joint part of the sheath pipe for the nickel-based high-temperature alloy pump can be improved, and the risk that the pipe joint part of the sheath pipe for the nickel-based high-temperature alloy pump is fractured is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of welding of pump protection sleeves, in particular to a welding device and a welding method for a pump protection sleeve based on a nickel-based superalloy. Background Art

[0002] As a pipe fitting protection component, the pump protection sleeve plays an irreplaceable role in pump equipment. It is usually installed around the pump shaft or mechanical seal and is made of metal (such as stainless steel) or high-performance composite materials. Its main functions include: isolating medium corrosion, reducing friction and wear, preventing particle intrusion, and assisting the stable operation of the sealing system. Among many protection sleeve materials, nickel-based superalloys stand out due to their excellent performance. This 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%). It has excellent corrosion resistance, high-temperature strength, and oxidation resistance, and is widely used in industrial equipment in extreme environments. The application fields include: 1. Chemical industry: used for protecting pump bodies that transport corrosive media such as strong acids and strong alkalis to ensure the long-term stable operation of equipment; 2. Oil and gas: in offshore platforms and onshore oil fields, protecting pump bodies from corrosion and wear and reducing maintenance costs; 3. Ocean engineering: in the marine environment, preventing pump bodies from failing due to salt spray corrosion; 4. Energy industry: in high-temperature and high-pressure environments, protecting pump body components and improving equipment reliability.

[0003] Currently, the welding method for nickel-based superalloy pump protection sleeves is the multi-layer and multi-pass welding process with all-weld nickel-based alloy welding wires. However, due to the high thermal sensitivity of nickel-based superalloys, coarse columnar crystal structures are easily formed after welding. This tissue morphology will significantly reduce the mechanical properties of the material. Such defects will seriously threaten the service safety and reliability of the welded structure under high-temperature and high-pressure working conditions. In addition, the nickel-based superalloy consists of two metals with very different properties (such as a base material layer and a nickel-based alloy composite material layer). The multi-layer and multi-pass welding process with all-weld nickel-based alloy welding wires will form a "strong-weak" interface between the weld and the base material, which will reduce the structural strength of the joint part of the entire nickel-based superalloy pump protection sleeve and is extremely likely to cause the joint part of the nickel-based superalloy pump protection sleeve to break. In addition, the welding cost of the multi-layer and multi-pass welding process with all-weld nickel-based alloy welding wires is relatively high, which will increase the welding cost of the entire nickel-based superalloy pump protection sleeve. Summary of the Invention

[0004] In view of the above-mentioned drawbacks in the existing production technology, the present applicant provides a welding device and a welding method for a pump casing made of nickel-based superalloy. By improving the welding method of the pump casing made of nickel-based superalloy, the structural strength of the joint part of the entire pump casing made of nickel-based superalloy can be improved, so as to reduce the risk of fracture of the joint part of the pump casing made of nickel-based superalloy. At the same time, the welding cost of the entire pump casing made of nickel-based superalloy can also be reduced.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A welding device and a welding method for a pump casing made of nickel-based superalloy, 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 casing made of nickel-based superalloy. The driving part is used to drive the fixing part to rotate along the axis 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 process a trapezoidal groove on the inner wall of the end face of the pump casing. The second processing part is used to process a U-shaped groove on the outer wall of the end face of the pump casing. The first welding part is located at one end of the fixing part. The second welding part is located above the fixing part. Both the first welding part and the second welding part are located on one side of the first processing part and the second processing part. The first welding part is used to perform double-tungsten-arc gas welding on the inner wall of the end face of the pump casing. The second welding part is used to perform single-tungsten-arc gas welding on the outer wall of the end face of the pump casing.

[0007] Therefore, during welding, first process a trapezoidal groove on the inner wall of the pump casing made of nickel-based superalloy and then perform double-tungsten-arc gas welding, and first process a U-shaped groove on the outer wall of the pump casing made of nickel-based superalloy and then perform single-tungsten-arc gas welding. Compared with the existing multi-layer and multi-pass welding method using all-weld nickel-based alloy welding wire, this method has a simple structure and is easy to operate. Different welding methods are adopted for different positions of the pump casing made of nickel-based superalloy, and combined with different groove treatments for different welding positions, the structural strength of the joint part of the entire pump casing made of nickel-based superalloy can be improved, so as to reduce the risk of fracture of the joint part of the pump casing made of nickel-based superalloy, and further improve the service life of the pump casing made of nickel-based superalloy after welding. In addition, through the mutual cooperation of double-tungsten-arc gas welding on the inner wall and single-tungsten-arc gas welding on the outer wall, the weld impact toughness of the joint part of the pump casing made of nickel-based superalloy after welding can be effectively improved. At the same time, by improving the welding method, the welding cost of the entire pump casing made of nickel-based superalloy can be reduced.

[0008] As a further improvement of the above technical solution: It further includes a base and a top plate, and the top plate is connected to the base through a support rod; the driving part is slidably connected to the base, the first processing part and the second processing part are slidably connected to the top plate, the first welding part is connected to the base, and the second welding part is connected to the top plate. Thus, through the connection mode of the driving part being slidably connected to the base, the nickel-based superalloy pump casing to be welded can be switched back and forth between groove processing and welding processing, and a set of equipment can complete the groove processing and welding processing of the nickel-based superalloy pump casing at the same time without disassembling the fixed nickel-based superalloy pump casing, which can improve the welding efficiency of the nickel-based superalloy pump casing and reduce the production cost of the entire welding device.

[0009] As a further improvement of the above technical solution: There are two first processing parts in total. The first processing part includes a first telescopic rod, a first slider, a second telescopic rod and a trapezoidal groove 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 groove processing block is connected to the telescopic end of the second telescopic rod. Thus, the two first processing parts can simultaneously perform trapezoidal groove processing on the end faces of the inner walls on both sides of the nickel-based superalloy pump casing to improve the processing efficiency of the trapezoidal groove of the nickel-based superalloy pump casing; start the first telescopic rod to make the trapezoidal groove processing block directly above the end face of the nickel-based superalloy pump casing, then start the second telescopic rod to drive the trapezoidal groove processing block to move downward and abut against the end face of the nickel-based superalloy pump casing. Finally, start the driving part, and drive the nickel-based superalloy pump casing to rotate through the driving part, and cooperate with the trapezoidal groove processing block to perform trapezoidal groove processing on the end face of the nickel-based superalloy pump casing, so as to form a trapezoidal groove on the inner wall of the end face of the nickel-based superalloy pump casing.

[0010] As a further improvement of the above technical solution: There are two second processing parts in total, and the second processing parts are located inside the first processing part. The second processing part includes: a second slider, a third telescopic rod, and a U-shaped groove 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 groove processing block is connected to the telescopic end of the third telescopic rod. Thus, the two second processing parts can simultaneously perform U-shaped groove processing on the end faces of the outer walls on both sides of the nickel-based superalloy pump casing, so as to improve the processing efficiency of the U-shaped groove processing of the nickel-based superalloy pump casing; start the first telescopic rod to make the U-shaped groove processing block directly above the end face of the nickel-based superalloy pump casing. Then, start the third telescopic rod to drive the U-shaped groove processing block to move downward and abut against the end face of the nickel-based superalloy pump casing. Finally, start the driving part, and drive the nickel-based superalloy pump casing to rotate through the driving part, and with the cooperation of the U-shaped groove processing block, perform U-shaped groove processing on the end face of the nickel-based superalloy pump casing, so as to form a U-shaped groove on the outer wall of the end face of the nickel-based superalloy pump casing.

[0011] As a further improvement of the above technical solution: The first welding part includes: a support frame, a fourth telescopic rod, and a first welding torch. The support frame is connected to the base, the fourth telescopic rod is connected to the support frame, and the first welding torch is connected to the telescopic end of the fourth telescopic rod. Thus, start the fourth telescopic rod to move the first welding torch to the welding position on the inner walls of the two nickel-based superalloy pump casings, and then start the driving part, and drive the nickel-based superalloy pump casing to rotate through the driving part, and with the cooperation of the first welding torch, perform double tungsten inert gas welding on the inner walls of the end faces of the nickel-based superalloy pump casings.

[0012] As a further improvement of the above technical solution: The second welding part includes: a fifth telescopic rod and a second welding torch. The fifth telescopic rod is connected to the top plate, and the second welding torch is connected to the telescopic end of the fifth telescopic rod. Thus, start the fifth telescopic rod to move the second welding torch to the welding position on the outer walls of the two nickel-based superalloy pump casings, and then start the driving part, and drive the nickel-based superalloy pump casing to rotate through the driving part, and with the cooperation of the second welding torch, perform single tungsten inert gas welding on the outer walls of the end faces of the nickel-based superalloy pump casings.

[0013] As a further improvement of the above technical solution: There are two fixing parts in total. The two fixing parts are respectively used to fix the pump casing sleeves of two nickel-based superalloys. The 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 part. The first fixing block and the second fixing block are both located inside the fixing ring. The first fixing block is located on the side of the fixing ring close to the base, and the second fixing block is located on the side of the fixing ring close to the top plate. The adjusting rod penetrates through the fixing ring and is threadedly connected to the fixing ring. The adjusting rod is rotatably connected to the second fixing block. The driving part includes: two driving units, a fixing seat and a sixth telescopic rod. The driving end of the driving unit is connected to the fixing ring. The driving unit is connected to the fixing seat. The fixing seat is slidably connected to the base. The sixth telescopic rod is connected to the base. The telescopic end of the sixth telescopic rod is connected to the fixing seat. The driving unit includes: a driving member, a first gear, a second gear and a support block. The driving member is connected to the fixing seat. The first gear is connected to the driving end of the driving member. The second gear meshes with the first gear. The second gear is sleeved outside the fixing ring. The support block is rotatably connected to the fixing ring. The support block is connected to the fixing seat. Thus, since the first fixing block is directly installed inside the fixing ring, when fixing the pump casing sleeves of nickel-based superalloys, the two pump casing sleeves of nickel-based superalloys are directly placed on the two first fixing blocks to ensure that the two pump casing sleeves of nickel-based superalloys are on the same axis. In this way, the end faces of the two pump casing sleeves of nickel-based superalloys can be completely overlapped and aligned without deviation. During welding, the two pump casing sleeves of nickel-based superalloys will not be misaligned, thereby improving the welding quality of the two pump casing sleeves of nickel-based superalloys. When fixing, first place the pump casing sleeve of nickel-based superalloy to be fixed on the first fixing block. Finally, rotate the adjusting rod to drive the second fixing block to move towards the side close to the first fixing block. Through the mutual cooperation of the first fixing block and the second fixing block, the pump casing sleeve of nickel-based superalloy is clamped and fixed. Start the driving member, drive the first gear to rotate through the first driving member, so that the second gear rotates, and then drive the fixing ring to rotate, so that the pump casing sleeve of nickel-based superalloy rotates. When the pump casing sleeve of nickel-based superalloy rotates one circle, the trapezoidal groove processing, U-shaped groove processing of the inner wall of the pump casing sleeve of nickel-based superalloy, double tungsten inert gas welding of the inner wall and single tungsten inert gas welding of the outer wall can be realized.

[0014] A welding method for a welding device of a pump casing sleeve based on nickel-based superalloy includes the following steps:

[0015] S1. Trapezoidal groove processing of the inner wall of the end face of the pump casing sleeve of nickel-based superalloy;

[0016] S2. Machining the U-shaped groove on the outer wall of the end face of the pump casing made of nickel-based superalloy;

[0017] S3. Performing double tungsten inert gas arc welding on the trapezoidal groove of the substrate layer of the two pump casings made of nickel-based superalloy;

[0018] S4. Performing single tungsten inert gas arc welding on the U-shaped groove of the transition layer of the two pump casings made of nickel-based superalloy;

[0019] S5. Performing single tungsten inert gas arc welding on the nickel-based alloy composite layer of the two pump casings made of nickel-based superalloy.

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

[0021] As a further improvement of the above technical solution: In S5, the surface of the high-temperature nickel-based alloy wire is sequentially subjected to decontamination, grinding, and polishing treatments to deposit a nickel layer and a niobium carbide layer on the surface of the high-temperature nickel-based alloy wire. Thus, by sequentially subjecting the surface of the high-temperature nickel-based alloy wire to decontamination, grinding, and polishing treatments, it is possible to ensure that the surface of the nickel-based alloy composite layer has a high cleanliness and roughness; in addition, the nickel layer, as a buffer layer, can effectively relieve the thermal stress during the single tungsten inert gas arc welding of the nickel-based alloy composite layer, improve the bonding strength between the electroplated layer and the nickel-based alloy composite layer, and the nickel layer can improve the electrical conductivity of the high-temperature nickel-based alloy wire and improve the stability of the arc. The niobium carbide layer has extremely high hardness and thermal stability, can significantly improve the thermal crack resistance of the high-temperature nickel-based alloy wire, and can also improve the high-temperature strain tolerance and high-temperature creep strength, thereby ensuring the overall performance of the pump casing made of nickel-based superalloy. At the same time, through the strengthening operation on the surface of the high-temperature nickel-based alloy wire, it is possible to improve the structural strength of the joint part of the pump casing made of nickel-based superalloy while significantly reducing the welding cost.

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

[0023] During welding, the inner wall of the nickel-based superalloy pump sleeve is first processed with a trapezoidal groove and then double-tungsten-arc gas welding is used. The outer wall of the nickel-based superalloy pump sleeve is first processed with a U-shaped groove and then single-tungsten-arc gas welding is used. Compared with the existing multi-layer and multi-pass welding method of all-weld 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 superalloy pump sleeve, and combined with different groove treatments for different welding positions, it can improve the structural strength of the joint part of the entire nickel-based superalloy pump sleeve, reduce the risk of fracture of the joint part of the nickel-based superalloy pump sleeve, and then improve the service life of the nickel-based superalloy pump sleeve after welding; in addition, through the mutual cooperation of double-tungsten-arc gas welding on the inner wall and single-tungsten-arc gas welding on the outer wall, the weld impact toughness of the joint part of the nickel-based superalloy pump sleeve after welding can be effectively improved; at the same time, by improving the welding method, the welding cost of the entire nickel-based superalloy pump sleeve can be reduced.

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

[0025] 1. Through the connection method of sliding connection between the driving part and the base, the nickel-based superalloy pump sleeve to be welded can be switched back and forth between groove processing and welding processing, and a set of equipment can complete the groove processing and welding processing of the nickel-based superalloy pump sleeve at the same time, without disassembling the fixed nickel-based superalloy pump sleeve, which can improve the welding efficiency of the nickel-based superalloy pump sleeve and reduce the production cost of the entire welding device.

[0026] 2. Through two first processing parts, the end faces of the inner walls on both sides of the nickel-based superalloy pump sleeve can be processed with trapezoidal grooves at the same time to improve the processing efficiency of the trapezoidal groove of the nickel-based superalloy pump sleeve; through two second processing parts, the end faces of the outer walls on both sides of the nickel-based superalloy pump sleeve can be processed with U-shaped grooves at the same time to improve the processing efficiency of the U-shaped groove of the nickel-based superalloy pump sleeve.

[0027] 3. By sequentially performing decontamination, grinding, and polishing treatments on the surface of the high-temperature nickel-based alloy wire, the present invention can ensure a high level of cleanliness and roughness on the surface of the nickel-based alloy composite layer. In addition, as a buffer layer, the nickel layer can effectively relieve thermal stress during the single-tungsten-electrode argon arc welding process of the nickel-based alloy composite layer, improve the bonding strength between the electrodeposited layer and the nickel-based alloy composite layer, and the nickel layer can also improve the electrical conductivity of the high-temperature nickel-based alloy wire and enhance the stability of the arc. The niobium carbide layer has extremely high hardness and thermal stability, can significantly improve the thermal crack resistance of the high-temperature nickel-based alloy wire, and can also improve the high-temperature strain tolerance and high-temperature creep strength, thereby ensuring the overall performance of the pump casing made of nickel-based superalloy. At the same time, through the strengthening operation on the surface of the high-temperature nickel-based alloy wire, it is possible to improve the structural strength of the joint part of the pump casing made of nickel-based superalloy while significantly reducing the welding cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of the first perspective of the welding device for the pump casing made of nickel-based superalloy according to the present invention;

[0029] Figure 2 is a schematic structural diagram of the first perspective of the welding device for the pump casing made of nickel-based superalloy according to the present invention;

[0030] Figure 3 is a schematic structural diagram of the installation of the first processing part and the second processing part according to the present invention;

[0031] Figure 4 is of the present invention Figure 3 local enlarged schematic diagram at A in;

[0032] Figure 5 is a schematic structural diagram of the first welding part according to the present invention;

[0033] Figure 6 is a schematic structural diagram of the second welding part according to the present invention;

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

[0035] Figure 8 is a schematic structural diagram of the pump casing made of nickel-based superalloy according to the present invention;

[0036] Figure 9 is of the present invention Figure 8 local enlarged schematic diagram at B in;

[0037] Figure 10 is a flowchart of the welding method of the welding device for the pump casing made of nickel-based superalloy according to the present invention.

[0038] Among them: 1. Driving part;

[0039] 101. Driving unit; 1011. Driving member; 1012. First gear; 1013. Second gear; 1014. Support block; 102. Fixed seat; 103. Sixth telescopic rod;

[0040] 2. Fixing part;

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

[0042] 3. First processing part;

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

[0044] 4. Second processing part;

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

[0046] 5. First welding part;

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

[0048] 6. Second welding part;

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

[0050] 7. Base;

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

[0052] The following combines with the attached drawings to illustrate the detailed implementation manners of the present invention.

[0053] As Figures 1 to 9As shown in the figure, a welding device for a pump casing made of nickel-based superalloy includes: a driving part 1, a fixing part 2, a first processing part 3, a second processing part 4, a first welding part 5 and a second welding part 6. The driving end of the driving part 1 is connected to the fixing part 2. The fixing part 2 is used to fix the pump casing made of nickel-based superalloy. The driving part 1 is used to drive the fixing part 2 to rotate along the axis 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 process a trapezoidal groove on the inner wall of the end face of the pump casing, and the second processing part 4 is used to process a U-shaped groove on the outer wall of the end face of the pump casing. 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-arc gas welding on the inner wall of the end face of the pump casing, and the second welding part 6 is used to perform single-tungsten-arc gas welding on the outer wall of the end face of the pump casing. Thus, during welding, the inner wall of the pump casing made of nickel-based superalloy is first processed with a trapezoidal groove and then double-tungsten-arc gas welding is used. The outer wall of the pump casing made of nickel-based superalloy is first processed with a U-shaped groove and then single-tungsten-arc gas welding is used. Compared with the existing multi-layer and multi-pass welding method using all-weld 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 pump casing made of nickel-based superalloy, and combined with groove treatment of different welding positions, it can improve the structural strength of the joint part of the entire pump casing made of nickel-based superalloy, so as to reduce the risk of fracture of the joint part of the pump casing made of nickel-based superalloy, and further improve the service life of the pump casing made of nickel-based superalloy after welding; in addition, through the mutual cooperation of double-tungsten-arc gas welding on the inner wall and single-tungsten-arc gas welding on the outer wall, the weld impact toughness of the joint part of the pump casing made of nickel-based superalloy after welding can be effectively improved; at the same time, by improving the welding method, the welding cost of the entire pump casing made of nickel-based superalloy can be reduced.

[0054] In this embodiment, it further includes: a base 7 and a top plate 8. The top plate 8 is connected to the base 7 through 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. Thus, through the connection method of the sliding connection between the driving part 1 and the base 7, the pump casing made of nickel-based superalloy to be welded can be switched back and forth between groove processing and welding processing, and a set of equipment can complete the groove processing and welding processing of the pump casing made of nickel-based superalloy at the same time, without disassembling the fixed pump casing made of nickel-based superalloy, which can improve the welding efficiency of the pump casing made of nickel-based superalloy and reduce the production cost of the entire welding device.

[0055] In this embodiment, there are two first processing units 3 in total. The first processing unit 3 includes: a first telescopic rod 301, a first slider 302, a second telescopic rod 303, and a trapezoidal groove 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 groove processing block 304 is connected to the telescopic end of the second telescopic rod 303. Thus, the two first processing units 3 can simultaneously perform trapezoidal groove processing on the end faces of the inner walls on both sides of the nickel-based superalloy pump casing, so as to improve the processing efficiency of the trapezoidal groove processing of the nickel-based superalloy pump casing. Start the first telescopic rod 301 to make the trapezoidal groove processing block 304 directly above the end face of the nickel-based superalloy pump casing. Then, start the second telescopic rod 303 to drive the trapezoidal groove processing block 304 to move downward and abut against the end face of the nickel-based superalloy pump casing. Finally, start the driving unit 1. The driving unit 1 drives the nickel-based superalloy pump casing to rotate, and with the cooperation of the trapezoidal groove processing block 304, the end face of the nickel-based superalloy pump casing is subjected to trapezoidal groove processing, so that a trapezoidal groove is formed on the inner wall of the end face of the nickel-based superalloy pump casing.

[0056] In this embodiment, there are two second processing units 4 in total, 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 groove 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 groove processing block 403 is connected to the telescopic end of the third telescopic rod 402. Thus, the two second processing units 4 can simultaneously perform U-shaped groove processing on the end faces of the outer walls on both sides of the nickel-based superalloy pump casing, so as to improve the processing efficiency of the U-shaped groove processing of the nickel-based superalloy pump casing. Start the first telescopic rod 301 to make the U-shaped groove processing block 403 directly above the end face of the nickel-based superalloy pump casing. Then, start the third telescopic rod 402 to drive the U-shaped groove processing block 403 to move downward and abut against the end face of the nickel-based superalloy pump casing. Finally, start the driving unit 1. The driving unit 1 drives the nickel-based superalloy pump casing to rotate, and with the cooperation of the U-shaped groove processing block 403, the end face of the nickel-based superalloy pump casing is subjected to U-shaped groove processing, so that a U-shaped groove is formed on the outer wall of the end face of the nickel-based superalloy pump casing.

[0057] It should be noted that: such as Figure 4 、 9As shown, the trapezoidal groove processing block 304 and the U-shaped groove processing block 403 are both composed of a connecting section and a processing section. The processing section is used for groove processing. The cross-sectional shape of the processing section of the trapezoidal groove processing block 304 is 1 / 2 trapezoid. The end faces of two nickel-based superalloy pump casings are abutted against each other to form a trapezoidal groove. The cross-sectional shape of the processing section of the U-shaped groove processing block 403 is 1 / 2 U-shape. The end faces of two nickel-based superalloy pump casings are abutted against each other to form a U-shaped groove.

[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. The first welding gun 503 is connected to the telescopic end of the fourth telescopic rod 502. Thus, by starting the fourth telescopic rod 502, the first welding gun 503 is moved to the welding position on the inner walls of two nickel-based superalloy pump casings. Then, by starting the driving part 1, the nickel-based superalloy pump casings are driven to rotate by the driving part 1, and with the cooperation of the first welding gun 503, double tungsten inert gas welding is performed on the inner walls of the end faces of the nickel-based superalloy pump casings.

[0059] In this embodiment, the second welding part 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. The second welding gun 602 is connected to the telescopic end of the fifth telescopic rod 601. Thus, by starting the fifth telescopic rod 601, the second welding gun 602 is moved to the welding position on the outer walls of two nickel-based superalloy pump casings. Then, by starting the driving part 1, the nickel-based superalloy pump casings are driven to rotate by the driving part 1, and with the cooperation of the second welding gun 602, single tungsten inert gas welding is performed on the outer walls of the end faces of the nickel-based superalloy pump casings.

[0060] In this embodiment, there are two fixing parts 2 in total. The two fixing parts 2 are respectively used to fix the pump casing sleeves made of nickel-based superalloy. 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 close to the base 7, and the second fixing block 203 is located on the side of the fixing ring 201 close to the top plate 8. The adjusting rod 204 penetrates 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 seat 102 and a sixth telescopic rod 103. The driving end of the driving unit 101 is connected to the fixing ring 201. The driving unit 101 is connected to the fixing seat 102. The fixing 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 fixing seat 102. The driving unit 101 includes: a driving member 1011, a first gear 1012, a second gear 1013 and a support block 1014. The driving member 1011 is connected to the fixing seat 102. The first gear 1012 is connected to the driving end of the driving member 1011. The second gear 1013 is meshed with the first gear 1012. The second gear 1013 is sleeved outside the fixing ring 201. The support block 1014 is rotatably connected to the fixing ring 201. The support block 1014 is connected to the fixing seat 102. Thus, since the first fixing block 202 is directly installed inside the fixing ring 201, when fixing the pump casing sleeves made of nickel-based superalloy, the two pump casing sleeves made of nickel-based superalloy are directly placed on the two first fixing blocks 202 to ensure that the two pump casing sleeves made of nickel-based superalloy are on the same axis. In this way, the end faces of the two pump casing sleeves made of nickel-based superalloy can be completely overlapped and aligned without deviation. During welding, the two pump casing sleeves made of nickel-based superalloy will not be misaligned, thereby improving the welding quality of the two pump casing sleeves made of nickel-based superalloy. When fixing, first place the pump casing sleeve made of nickel-based superalloy to be fixed on the first fixing block 202. Finally, rotate the adjusting rod 204 to drive the second fixing block 203 to move towards the side close to the first fixing block 202. Through the mutual cooperation of the first fixing block 202 and the second fixing block 203, the pump casing sleeve made of nickel-based superalloy is clamped and fixed. Start the driving member 1011, drive the first gear 1012 to rotate through the first driving member 1011, so that the second gear 1013 rotates, and then drive the fixing ring 201 to rotate, so that the pump casing sleeve made of nickel-based superalloy rotates. When the pump casing sleeve made of nickel-based superalloy rotates one circle, the trapezoidal groove machining, U-shaped groove machining, double tungsten inert gas welding on the inner wall and single tungsten inert gas welding on the outer wall of the pump casing sleeve made of nickel-based superalloy can be realized.

[0061] For example, the driving member 1011 is a motor.

[0062] The welding process of the protective sleeve for nickel-based superalloy pumps of the present invention is as follows: First, the two protective sleeves for nickel-based superalloy pumps to be welded are respectively fixed through the two fixing parts 2; then, through the mutual cooperation of the driving part 1 and the first processing part 3, the inner walls of the end faces of the two protective sleeves for nickel-based superalloy pumps are processed with trapezoidal grooves (at this time, the two protective sleeves for nickel-based superalloy pumps do not contact, and the two protective sleeves for nickel-based superalloy pumps are in the area where the first processing part 3 and the second processing part 4 are located); then, through the mutual cooperation of the driving part 1 and the second processing part 4 (the lateral movement of the U-groove processing block 403 is still realized through the first telescopic rod 301 of the first processing part 3), the outer walls of the end faces of the two protective sleeves for nickel-based superalloy pumps are processed with U-grooves; then, through the sixth telescopic rod 103, the protective sleeve for nickel-based superalloy pumps is moved to the area where the first welding part 5 and the second welding part 6 are located, and the two protective sleeves for nickel-based superalloy pumps are adjusted to a state of mutual abutment through the fixing part 2; then, the fourth telescopic rod 502 is started to make the first welding torch 503 reach the welding position, and then the driving member 1011 is started. The driving member 1011 drives the protective sleeve for nickel-based superalloy pumps to rotate one week (the first rotation of one week), and with the cooperation of the first welding torch 503, the trapezoidal groove (i.e., the base material layer) on the inner wall of the end face of the protective sleeve for nickel-based superalloy pumps is subjected to double tungsten inert gas welding; finally, the fifth telescopic rod 601 is started to make the second welding torch 602 reach the welding position, and then the driving member 1011 is started. The driving member 1011 drives the protective sleeve for nickel-based superalloy pumps to rotate one week (the second rotation of one week), and with the cooperation of the first welding torch 503, the U-groove (i.e., the transition layer) on the outer wall of the end face of the protective sleeve for nickel-based superalloy pumps is subjected to single tungsten inert gas welding. Then, the driving member 1011 drives the protective sleeve for nickel-based superalloy pumps to rotate one week (the third rotation of one week), and with the cooperation of the first welding torch 503, at the same time, a 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 protective sleeve for nickel-based superalloy pumps (i.e., the nickel-based alloy composite material layer).

[0063] As Figure 10 shown, a welding method for a welding device of a protective sleeve for a pump based on nickel-based superalloy includes the following steps:

[0064] S1. Processing of the trapezoidal groove on the inner wall of the end face of the protective sleeve for the pump of nickel-based superalloy;

[0065] S2. Processing of the U-groove on the outer wall of the end face of the protective sleeve for the pump of nickel-based superalloy;

[0066] S3. Perform double tungsten electrode argon arc welding on the trapezoidal groove of the base material layer of the pump casing of two nickel-based superalloys;

[0067] S4. Perform single tungsten electrode argon arc welding on the U-shaped groove of the transition layer of the pump casing of two nickel-based superalloys;

[0068] S5. Perform single tungsten electrode argon arc welding on the nickel-based alloy composite material layer of the pump casing of two nickel-based superalloys.

[0069] In this embodiment, in S5, the single tungsten electrode argon arc welding wire for the nickel-based alloy composite material layer is a high-temperature nickel-based alloy wire. The surface of the high-temperature nickel-based alloy wire is sequentially decontaminated, polished, and buffed to deposit a nickel layer and a niobium carbide layer on the surface of the high-temperature nickel-based alloy wire. Thus, by sequentially decontaminating, polishing, and buffing the surface of the high-temperature nickel-based alloy wire, it can ensure that the surface of the nickel-based alloy composite material layer has a high cleanliness and roughness; in addition, the nickel layer, as a buffer layer, can effectively relieve the thermal stress during the single tungsten electrode argon arc welding of the nickel-based alloy composite material layer, improve the bonding strength between the electrodeposited layer and the nickel-based alloy composite material layer, and the nickel layer can improve the electrical conductivity of the high-temperature nickel-based alloy wire and improve the stability of the arc. The niobium carbide layer has extremely high hardness and thermal stability, can significantly improve the thermal crack resistance of the high-temperature nickel-based alloy wire, and can also improve the high-temperature strain tolerance and high-temperature creep strength, thereby ensuring the overall performance of the pump casing of the nickel-based superalloy. At the same time, through the strengthening operation on the surface of the high-temperature nickel-based alloy wire, it can improve the structural strength of the joint part of the pump casing of the nickel-based superalloy while significantly reducing the welding cost.

[0070] For example: The high-temperature nickel-based alloy wire adopts ERNiCrMo-3.

[0071] In summary, during welding of the present invention, the inner wall of the pump casing of the nickel-based superalloy is first processed with a trapezoidal groove and then double tungsten electrode argon arc welding is used, and the outer wall of the pump casing of the nickel-based superalloy is first processed with a U-shaped groove and then single tungsten electrode argon arc welding is used. Compared with the existing multi-layer and multi-pass welding method of all-weld nickel-based alloy wires, this method has a simple structure and is easy to operate. Different welding methods are adopted for different positions of the pump casing of the nickel-based superalloy, and combined with different groove treatments for different welding positions, it can improve the structural strength of the joint part of the entire pump casing of the nickel-based superalloy, so as to reduce the risk of fracture of the joint part of the pump casing of the nickel-based superalloy, and thus can improve the service life of the pump casing of the nickel-based superalloy after welding; in addition, through the mutual cooperation of double tungsten electrode argon arc welding on the inner wall and single tungsten electrode argon arc welding on the outer wall, it can effectively improve the weld impact toughness of the joint part of the pump casing of the nickel-based superalloy after welding; at the same time, by improving the welding method, it can reduce the welding cost of the entire pump casing of the nickel-based superalloy.

[0072] The above description is an explanation of the present invention, not a limitation thereof. For the scope defined by the present invention, refer to the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A welding device for a pump casing made of nickel-based superalloy, characterized in that, Including: A driving part (1) and a fixing part (2), the driving end of the driving part (1) is connected to the fixing part (2), the fixing part (2) is used for fixing the pump casing made of nickel-based superalloy, and the driving part (1) is used for driving the fixing part (2) to rotate along the axial direction of the fixing part (2); A first processing part (3) and a second processing part (4), both the first processing part (3) and the second processing part (4) are located above the fixing part (2), and the first processing part (3) is used for processing a trapezoidal groove on the inner wall of the end face of the pump casing, and the second processing part (4) is used for processing a U-shaped groove on the outer wall of the end face of the pump casing; A first welding part (5) and a second welding part (6), the first welding part (5) is located at one end of the fixing part (2), the second welding part (6) is located above the fixing part (2), and 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 for performing double-tungsten-arc gas welding on the inner wall of the end face of the pump casing, and the second welding part (6) is used for performing single-tungsten-arc gas welding on the outer wall of the end face of the pump casing.

2. The welding device for the pump casing made of nickel-based superalloy according to claim 1, characterized in that: Further including: A base (7) and a top plate (8), the top plate (8) is connected to the base (7) through 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 device for the pump casing made of nickel-based superalloy according to claim 2, characterized in that: There are two first processing parts (3) in total, and the first processing part (3) includes: A first telescopic rod (301), a first slider (302), a second telescopic rod (303) and a trapezoidal groove 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 groove processing block (304) is connected to the telescopic end of the second telescopic rod (303).

4. The welding device for the pump casing made of nickel-based superalloy according to claim 3, characterized in that: There are two second processing parts (4) in total, and the second processing part (4) is located inside the first processing part (3). The second processing part (4) includes: A second slider (401), a third telescopic rod (402) and a U-shaped groove 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 groove processing block (403) is connected to the telescopic end of the third telescopic rod (402).

5. The welding device for the pump casing made of nickel-based superalloy according to claim 2, characterized in that: The first welding part (5) includes: A support frame (501), a fourth telescopic rod (502), and a first welding gun (503), wherein 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).

6. The welding device for the pump protection sleeve based on nickel-based superalloy according to claim 2, wherein: The second welding part (6) includes: A fifth telescopic rod (601) and a second welding gun (602), wherein 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).

7. The welding device for the pump sleeve based on nickel-based superalloy according to claim 2, characterized in that: There are two fixing parts (2) in total, and the two fixing parts (2) are respectively used to fix the pump casing pipes made of nickel-based superalloy. 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) close to the base (7), and the second fixing block (203) is located on the side of the fixing ring (201) close to the top plate (8). The adjusting rod (204) penetrates 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 seat (102), and a sixth telescopic rod (103). The driving end of the driving unit (101) is connected to the fixing ring (201). The driving unit (101) is connected to the fixing seat (102). The fixing 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 fixing seat (102); The driving unit (101) includes: A driving member (1011), a first gear (1012), a second gear (1013), and a support block (1014). The driving member (1011) is connected to the fixing seat (102). The first gear (1012) is connected to the driving end of the driving member (1011). The second gear (1013) is meshed with the first gear (1012). The second gear (1013) is sleeved outside the fixing ring (201). The support block (1014) is rotatably connected to the fixing ring (201). The support block (1014) is connected to the fixing seat (102).

8. A welding method of a welding device for a pump jacket based on a nickel-based superalloy as described in any one of claims 1-7, characterized in that: It includes the following steps: S1. Machining the trapezoidal groove on the inner wall of the end face of the pump casing pipe made of nickel-based superalloy; S2. Machining the U-shaped groove on the outer wall of the end face of the pump casing pipe made of nickel-based superalloy; S3. Carry out double tungsten electrode argon arc welding on the trapezoidal groove of the substrate layer of the pump casing made of two nickel-based superalloys; S4. Carry out single tungsten electrode argon arc welding on the U-shaped groove of the transition layer of the pump casing made of two nickel-based superalloys; S5. Carry out single tungsten electrode argon arc welding on the nickel-based alloy composite layer of the pump casing made of two nickel-based superalloys.

9. The welding method of the welding device for the pump sleeve made of nickel-based superalloy according to claim 8, characterized in that: In S5, the single tungsten electrode argon arc welding wire for the nickel-based alloy composite layer is a high-temperature nickel-based alloy wire.

10. The welding method of the welding device for the pump casing made of nickel-based superalloy as claimed in claim 9, characterized in that: In S5, the surface of the high-temperature nickel-based alloy wire is sequentially decontaminated, ground, and polished to deposit a nickel layer and a niobium carbide layer on the surface of the high-temperature nickel-based alloy wire.

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