A friction stir welding device and welding method for a foamed metal screen pipe

Abstract

The present invention discloses a friction stir welding device and a welding method for a foamed metal screen pipe, which includes a curling device and a welding device. A mandrel is connected to a curling table plate of the curling device through a mandrel seat. The mandrel is placed parallel to the curling table plate. A curling die is slidably arranged around the mandrel. A nickel foam plate is placed directly below the mandrel. The curling die extrudes towards the mandrel direction to bend the nickel foam plate into an annular column shape. One side of a welding table plate of the welding device is provided with an operation platform, and a clamping mechanism is arranged on the operation platform for fixing the bent nickel foam plate. The welding table plate is connected to a moving block through a guiding mechanism. The bottom of the moving block is connected to a non-pin stirring head and a pressing wheel. The non-pin stirring head and the pressing wheel are arranged on the same straight line. The guiding mechanism moves the non-pin stirring head and the pressing wheel above the operation platform. The non-pin stirring head welds the weld seam of the bent nickel foam plate, and the pressing wheel extrudes the weld seam of the nickel foam plate. The present invention has the advantages of stable welding quality, high welding consistency, and high overall welding efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of welding foam metal sand retaining layers of sand control screen pipes for oil development operations, and in particular relates to a foam metal screen pipe friction stir welding device and a welding method. Background Art

[0002] Metal foam is a metal material consisting of a metal matrix containing a specific number of pores of a certain size and porosity. It is essentially a composite material of metal and gas. Due to its unique structure, it possesses both the properties of metal and gas bubbles, with a porosity exceeding 80%. The pore size can be adjusted from 0.05mm to 10mm, and the pore size is highly uniform.

[0003] Porous foam materials are a type of functional structural integrated material that utilizes a three-dimensional pore structure to optimize indicators such as filtration performance and mechanical properties. It has the advantages of high porosity, good permeability, strong flow capacity, and low bulk density. Using metal as a substrate, porous foam metal materials can be obtained through special processing methods such as electroplating deposition. This porous metal material also has good mechanical properties, high temperature resistance, corrosion resistance, wear resistance and other properties. Due to its excellent various properties, porous foam materials are widely used in aerospace, machinery, construction, electrochemistry, petrochemical and other fields, involving many process technologies such as separation, filtration, noise reduction, heat insulation, electrochemical processes, etc., and play a huge role in science and technology and national economic construction.

[0004] Because foam metal has good permeability, it is a good filter material with high porosity, excellent permeability and filtration accuracy. It can make full use of the pores of foam metal to retain and capture solid particles in the fluid medium, separate and filter the gas or liquid to achieve the purpose of purifying and separating the medium, thus having good application prospects in the field of oil sand control.

[0005] With the advancement of technology, welding techniques are rapidly evolving. Commonly used nickel and nickel alloy welding methods include arc welding, tungsten and gas shielded welding, plasma welding, resistance welding, and brazing. These welding methods are prone to problems such as cracking at the weld, reduced corrosion resistance, shallow penetration of the nickel alloy liquid weld metal, and poor fluidity. Porous nickel foams, with a three-dimensional pore structure and a porosity of 78.9%, exhibit a polyhedral "cage-like" structure. Current welding processes are unsuitable for this type of material, and are prone to weld penetration, cracking, and fracture, resulting in poor weld quality. Summary of the Invention

[0006] The problem to be solved by the present invention is to provide a welding device and a welding method, especially applicable to friction stir welding of foamed metal screen pipes, realizing the successful welding of foamed nickel metal materials, with stable welding quality, high welding consistency, and high overall welding efficiency for a friction stir welding device and method of foamed metal screen pipes.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is: a friction stir welding device for foamed metal screen pipes, including a curling device and a welding device. The curling device includes a curling table board, on which a mandrel is connected through a mandrel seat. The mandrel is placed parallel to the curling table board, and a curling die is slidably arranged around the mandrel. The foamed nickel plate is placed directly below the mandrel, and the curling die squeezes towards the mandrel direction to bend the foamed nickel plate into a circular column shape. The welding device includes a welding table board, on one side of which there is an operation platform, and a clamping mechanism is arranged on the operation platform to fix the bent foamed nickel plate. The welding table board is connected to a moving block through a guiding mechanism, and a non-pin stirring head and a pressing wheel are connected to the bottom of the moving block. The non-pin stirring head and the pressing wheel are arranged on the same straight line. The guiding mechanism moves the non-pin stirring head and the pressing wheel above the operation platform, and the non-pin stirring head welds the weld of the bent foamed nickel plate, and the pressing wheel squeezes the weld of the foamed nickel plate.

[0008] Further, the mandrel is a cylindrical die, and both ends of the mandrel are connected to the mandrel seat through rolling mechanisms for rolling connection.

[0009] Further, the curling die includes a left die, a right die, and an upper die. The left die and the right die are both slidably arranged on both sides of the mandrel, and the upper die is slidably arranged at the upper end of the mandrel. The left die, the right die, and the upper die are all provided with sliders, and the sliders are placed in the tracks for sliding.

[0010] Further, the left die, the right die, and the upper die are all connected to a telescopic mechanism, and the telescopic mechanism drives the left die, the right die, and the upper die to slide in the corresponding tracks.

[0011] Further, the guiding mechanism includes a first guide rail and a second guide rail. The first guide rail is placed on the upper surface of the welding table board, and the first guide rail changes the displacement of the non-pin stirring head and the pressing wheel in the front-back direction. The second guide rail is arranged perpendicular to the welding table board, and the second guide rail changes the displacement of the non-pin stirring head and the pressing wheel in the up-down direction.

[0012] Further, the needleless stirring head includes a shoulder, a clamping rod is provided at the top of the shoulder, a stirring surface is provided at the bottom of the shoulder, the clamping rod, the shoulder and the stirring surface are detachably connected, the pressing wheel is connected to the pressing wheel bracket through a pin shaft, and the clamping rod and the pressing wheel bracket are both fixed on the moving block.

[0013] Further, the present invention also provides a friction stir welding method for a foamed metal screen pipe, which uses the above-mentioned friction stir welding equipment for a foamed metal screen pipe, and includes the following steps:

[0014] S1: Making a foamed metal reel from a nickel foam plate through a curling device;

[0015] S2: Cleaning both sides of the groove of the foamed metal reel to be welded;

[0016] S3: Installing the foamed metal reel so that the weld seam is placed directly above, and the clamping mechanism pressing the foamed metal reel;

[0017] S4: Uniformly spreading a welding flux between the weld seams and compacting it with a pressing wheel;

[0018] S5: Adjusting the position of the needleless stirring head so that it contacts the weld seam;

[0019] S6: Starting the welding to form the foamed metal reel in one pass.

[0020] Further, the S1 includes the following steps:

[0021] S11: Placing the nickel foam plate directly below the mandrel;

[0022] S12: The telescopic mechanism drives the left mold, the right mold and the upper mold to extrude towards the mandrel respectively, so that the nickel foam plate is bent into a circular cylindrical shape to form a foamed metal reel.

[0023] Further, the S4 includes the following steps:

[0024] S41: Uniformly spreading a welding flux of 0.3 mm - 0.5 mm between the weld seams and compacting it with the pressing wheel;

[0025] S42: Adjusting the position of the pressing wheel so that the middle part of the pressing wheel vertically extrudes the weld seam by 2 mm - 3 mm, and uniformly spreading a welding flux of 0.3 mm - 0.5 mm again at both ends of the weld seam and compacting it with the pressing wheel.

[0026] Further, the S6 includes the following steps:

[0027] S61: Adjust the position of the needleless stirring head to make it move downward. After the needleless stirring head contacts the foam metal reel, wait until the needleless stirring head becomes hot and red, then click the cycle start button, and the welding starts at this time;

[0028] S62: After the needleless stirring head has traveled 30 mm from the starting point, adjust the feed rate knob to 40%;

[0029] S63: During the welding process, adjust the height of the needleless stirring head to maintain the red-hot state of the needleless stirring head;

[0030] S64: When the needleless stirring head reaches 30 mm from the end point, adjust the feed rate knob to 30%, and continue until the needleless stirring head reaches the end of the weld;

[0031] S65: When the needleless stirring head reaches the end of the weld, lift the needleless stirring head upward, click the reset button, the main shaft stops rotating, and adjust the needleless stirring head away from the foam metal reel to complete the welding of the weld.

[0032] The advantages and positive effects of the present invention are:

[0033] 1. The present invention uses a curling device to form a foam nickel plate into a foam metal reel. The curling device can adjust the diameter of the foam metal reel according to the core shaft diameter and the cooperation of the upper die, left die, and right die, so as to produce foam metal screen pipes of multiple specifications, with strong practicability.

[0034] 2. The present invention uses a welding device to weld the weld of the foam metal reel. During the welding process, the foam metal reel is fixed by a clamping mechanism. The clamping mechanism adjusts its distance in the horizontal and vertical directions corresponding to the diameter of the foam metal reel, which is convenient for squeezing and positioning screen pipes of different diameters, and has a good positioning effect.

[0035] 3. Before and after welding the weld, the flux in the weld is extruded and flattened by a pressure wheel, and the weld is welded by a needleless stirring head. The needleless stirring head adopts a split design, which solves the problem that one material currently cannot meet the overall design requirements. Compared with the prior art, the present invention realizes the successful welding of foam nickel metal materials, with stable welding quality, high welding consistency, and high overall welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic structural diagram of the curling device according to an embodiment of the present invention.

[0037] Figures 2-3 It is a schematic structural diagram of the welding device according to an embodiment of the present invention.

[0038] Figures 4-5Schematic structural diagram of the needleless stirring head according to an embodiment of the present invention.

[0039] Figure 6 Schematic structural diagram of the pressure wheel according to an embodiment of the present invention.

[0040] Figure 7 Process flow chart according to an embodiment of the present invention.

[0041] In the figure:

[0042] 1. Bending table board, 2. Mandrel seat, 3. Telescopic mechanism

[0043] 4. Mounting seat, 5. Left mold, 6. Right mold

[0044] 7. Upper mold, 8. Connecting frame, 9. Mandrel

[0045] 10. Track, 11. Guide post, 12. Operating platform

[0046] 13. Clamping mechanism, 14. First guide rail, 15. Pressure wheel

[0047] 16. Needleless stirring head, 17. Pin shaft, 18. Pressure wheel bracket

[0048] 19. Clamping rod, 20. Shoulder, 21. Stirring surface

[0049] 22. Moving block, 23. Guide sleeve, 24. Support leg

[0050] 25. Welding table board, 26. Second guide rail, 27. Electric control cabinet

[0051] 28. Control panel. Detailed implementation manners

[0052] Next, the technical solutions of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0053] Next, the embodiments of the present invention will be further described in conjunction with the accompanying drawings:

[0054] As Figure 1 shown, a friction stir welding device for a foamed metal screen pipe includes a bending device and a welding device. The bending device includes a bending table board 1. A mandrel 9 is connected to the bending table board 1 through a mandrel seat 2. The mandrel 9 is placed parallel to the bending table board 1. A bending mold is slidably arranged around the mandrel 9. The nickel foam plate is placed directly below the mandrel 9. The bending mold squeezes towards the mandrel 9 to bend the nickel foam plate into an annular column shape.

[0055] In this embodiment, a nickel foam plate is formed into a metal foam reel by a curling device. The curling device can adjust the diameter of the metal foam reel according to the diameter of the mandrel 9 and the cooperation of the curling die, so as to produce metal foam screen pipes of multiple specifications, which has strong practicability.

[0056] Specifically, as Figure 1 shown, the curling table board 1 is a rectangular board. Core shaft seats 2 are provided at both ends in the length direction of the curling table board 1. The two core shaft seats 2 are respectively connected to both ends of the core shaft 9. The core shaft 9 is a cylindrical die, and both ends of the core shaft 9 are in rolling connection with the core shaft seats 2 through a rolling mechanism. The rolling mechanism can be of various structures as long as the above functions are achieved. Specifically, the rolling mechanism provided in this embodiment is a bearing.

[0057] A curling die is slidably arranged around the core shaft 9. Specifically, the curling die provided in this embodiment includes a left die 5, a right die 6 and an upper die 7. The left die 5 and the right die 6 are both slidably arranged on both sides of the core shaft 9, and the upper die 7 is slidably arranged at the upper end of the core shaft 9. The left die 5, the right die 6 and the upper die 7 are all provided with sliders, and the sliders are placed in the track 10 and slide. At the same time, the left die 5, the right die 6 and the upper die 7 are all connected to a telescopic mechanism 3, and the telescopic mechanism 3 drives the left die 5, the right die 6 and the upper die 7 to slide in the corresponding track 10.

[0058] Preferably, guide posts 11 are provided at the four corners of the curling table board 1 provided in this embodiment. A connecting frame 8 is connected between the tops of the guide posts 11. A telescopic mechanism 3 is provided on the connecting frame 8. A guide sleeve 23 is sleeved on the outer column surface of the guide post 11. The guide sleeves 23 are connected by a connecting rod. An upper die slider is provided on the connecting rod. The telescopic mechanism 3 is connected to the upper die slider and drives the upper die 7 to move up and down in the direction of the guide post 11.

[0059] A track 10 is provided at the bottom of the core shaft 9. The left die slider and the right die slider cooperate with the track 10. Both ends of the left die slider and the right die slider are respectively connected to a telescopic mechanism 3. The telescopic mechanism 3 is fixed to the curling table board 1 through a mounting seat 4. The telescopic mechanism 3 respectively drives the left die 5 and the right die 6 to slide in the track 10, so that the left die 5 and the right die 6 move towards the core shaft 9. Specifically, the telescopic mechanism 3 in this embodiment pushes the upper die 7, the left die 5 and the right die 6 to move along the track 10 through a hydraulic cylinder, so as to form a nickel foam round tube.

[0060] Support legs 24 are provided under the curling table board 1, and the support legs 24 lift the curling table board 1 to a certain height in the vertical direction.

[0061] As Figure 2 、 Figure 3As shown in the figure, the welding device includes a welding table 25. On one side of the welding table 25, there is an operation platform 12. On the operation platform 12, there is a clamping mechanism 13. The clamping mechanism 13 includes eight groups of fixing parts, which are fixedly connected to the operation platform 12 by bolts and can be used to fix the bent nickel foam plate. By adjusting the positions of the bolts, the clamping degree of the nickel foam plate to be welded can be adjusted.

[0062] On the welding table 25, a moving block 22 is connected through a guiding mechanism. At the bottom of the moving block 22, a needleless stirring head 16 and a pressing wheel 15 are connected. The needleless stirring head 16 and the pressing wheel 15 are arranged on the same straight line. The guiding mechanism moves the needleless stirring head 16 and the pressing wheel 15 above the operation platform 12. The needleless stirring head 16 welds the weld seam of the bent nickel foam plate, and the pressing wheel 15 extrudes the weld seam of the nickel foam plate.

[0063] Specifically, as Figure 2 、 Figure 3 shown in the figure, the guiding mechanism includes a first guide rail 14 and a second guide rail 26. The first guide rail 14 is placed on the upper surface of the welding table 25. The first guide rail 14 cooperates with the moving block 22 to change the displacement of the needleless stirring head 16 and the pressing wheel 15 in the front and back directions. The second guide rail 26 is arranged perpendicular to the welding table 25. The second guide rail 26 cooperates with the moving block 22 to change the displacement of the needleless stirring head 16 and the pressing wheel 15 in the up and down directions. The first guide rail 14 and the second guide rail 26 are arranged perpendicular to each other, so that the positions of the needleless stirring head 16 and the pressing wheel 15 can be adjusted and cooperate with the operation platform 12. The guiding mechanism is respectively connected to an electric control cabinet 27 and a control panel 28. The user manipulates the electric control cabinet 27 through the control panel 28 to drive the moving block 22 to move along the guiding mechanism.

[0064] Specifically, the bottom of the moving block 22 is connected to the needleless stirring head 16 and the pressing wheel 15. As Figure 4 、 Figure 5 shown in the figure, the needleless stirring head 16 includes a shoulder 20. At the top of the shoulder 20, there is a clamping rod 19. At the bottom of the shoulder 20, there is a stirring surface 21. The clamping rod 19, the shoulder 20 and the stirring surface 21 are connected in a split manner, which solves the problem that one material currently cannot meet the overall design requirements of production. As Figure 6 shown in the figure, the pressing wheel 15 is connected to the pressing wheel bracket 18 through a pin shaft 17. The clamping rod 19 and the pressing wheel bracket 18 are both fixed on the moving block 22. During use, the pressing wheel 15 is started to move linearly along the guide rail. During the moving process, the pressing wheel 15 compresses the foam metal material by 2 mm - 3 mm. During the actual processing process, the operator evenly spreads the welding flux on the welding surface according to the actual processing technology requirements. The pressing wheel 15 can evenly compact the welding flux, making the equipment have high use flexibility.

[0065] As Figure 7As described above, the present invention also provides a friction stir welding method for a foamed metal screen pipe, which uses the above-mentioned friction stir welding equipment for the foamed metal screen pipe and includes the following steps.

[0066] S1: Make a foamed metal reel from a nickel foam plate through a bending device. Specifically, S1 includes the following steps.

[0067] S11: Place the nickel foam plate directly below the mandrel 9.

[0068] S12: The telescopic mechanism 3 drives the left mold 5, the right mold 6, and the upper mold 7 to extrude towards the mandrel 9 respectively, so that the nickel foam plate bends into an annular columnar shape to form a foamed metal reel.

[0069] S2: Clean both sides of the groove of the foamed metal reel to be welded. Specifically, use alcohol to clean both sides of the groove and the inner wall of the foamed metal reel, and wipe it clean with a white cloth; detect the surface finish of the stirring surface 21 to ensure that its surface roughness reaches above 1.6.

[0070] S3: Install the foamed metal reel with the weld seam placed directly above, and the clamping mechanism 13 presses the foamed metal reel tightly. Specifically, put the foamed metal reel to be welded onto the base pipe, ensure that the weld seam position is directly above, and ensure that the longitudinal weld seam spacing is not greater than 2 mm.

[0071] S4: Uniformly spread the welding flux between the weld seams and compact it with the pressure wheel 15. Specifically, S4 includes the following steps.

[0072] S41: Uniformly spread the welding flux 0.3 mm - 0.5 mm between the weld seams and compact it with the pressure wheel 15.

[0073] S42: Adjust the position of the pressure wheel 15 so that the middle part of the pressure wheel 15 vertically extrudes the weld seam by 2 mm - 3 mm, and uniformly spread the welding flux 0.3 mm - 0.5 mm again at both ends of the weld seam, and compact it with the pressure wheel 15.

[0074] S5: Adjust the position of the non-pin stirring head 16 so that it contacts the weld seam. Specifically, for welding zero-point positioning, when adjusting the position of the non-pin stirring head 16, first place the non-pin stirring head 16 at the highest point of the weld seam, and then move it downward until it contacts the foamed metal reel to be welded.

[0075] S6: Start welding to form the foamed metal reel in one pass. Specifically, S6 includes the following steps.

[0076] S61: Adjust the position of the non-pin stirring head 16 so that it runs downward. When the non-pin stirring head 16 contacts the foamed metal reel, wait for the non-pin stirring head 16 to become hot and red, control the temperature of the non-pin stirring head 16 at 950 °C ± 50 °C, and click the cycle start button. At this time, welding begins. Specifically, run according to the following program.

[0077] DRFOF

[0078] M85

[0079] G54M03S2000

[0080] G0 G90 X0 Y0 Z30

[0081] GOO G94 Z20

[0082] G01ZO.0F100

[0083] M85

[0084] [[ID=2s]]G90 G01 X-1120F200

[0085] M85

[0086] G00Z100

[0087] G00X0.0Y

[0088] S62: When the non - needle stirring head 16 has walked 30 mm past the starting point, adjust the feed rate knob to 40%. The normal feed speed provided in this embodiment is 160 mm / min;

[0089] S63: During the welding process, adjust the height of the non - needle stirring head 16 to maintain the red - hot state of the non - needle stirring head 16;

[0090] S64: When the non - needle stirring head 16 reaches 30 mm from the end point, adjust the feed rate knob to 30% until the non - needle stirring head 16 reaches the end of the weld seam.

[0091] S65: When the non - needle stirring head 16 reaches the end of the weld seam, lift the non - needle stirring head 16 upward, click the reset button, the main shaft stops rotating, and adjust the non - needle stirring head 16 away from the foam metal reel to complete the welding of the weld seam.

[0092] The advantages and positive effects of the present invention are:

[0093] 1. The present invention uses a rolling and bending device to form a foam metal reel from a foam nickel plate. The rolling and bending device can adjust the diameter of the foam metal reel according to the core shaft diameter and the cooperation of the upper die, left die and right die, so as to produce foam metal screen pipes of multiple specifications, with strong practicability.

[0094] 2. The present invention uses a welding device to weld the weld seam of the foam metal reel. During the welding process, the foam metal reel is fixed by a clamping mechanism. The clamping mechanism adjusts its distance in the horizontal and vertical directions corresponding to the diameter of the foam metal reel, which is convenient for extrusion positioning of screen pipes with different diameters and has good positioning effect.

[0095] 3. Before and after welding the weld seam, the present invention squeezes and flattens the welding flux in the weld seam through a pressure wheel, and welds the weld seam through a non-pin stirring head. The non-pin stirring head adopts a split design, which solves the problem that one material currently cannot meet the overall design requirements. Compared with the prior art, the present invention realizes the successful welding of nickel foam metal materials, with stable welding quality, high welding consistency, and high overall welding efficiency.

[0096] The above has described the embodiments of the present invention in detail, but the content described is only the preferred embodiments of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A friction stir welding device for a foamed metal screen pipe, characterized in that: It includes a curling device and a welding device. The curling device includes a curling table plate, on which a mandrel is connected through a mandrel seat. The mandrel is placed parallel to the curling table plate. A curling die is slidably arranged around the mandrel. The nickel foam plate is placed directly below the mandrel. The curling die extrudes towards the mandrel direction, making the nickel foam plate bend into an annular column shape. The welding device includes a welding table plate. On one side of the welding table plate, there is an operation platform. A clamping mechanism is arranged on the operation platform. The clamping mechanism fixes the bent nickel foam plate. On the welding table plate, a moving block is connected through a guiding mechanism. The bottom of the moving block is connected with a non-needle stirring head and a pressing wheel. The non-needle stirring head and the pressing wheel are arranged on the same straight line. The guiding mechanism moves the non-needle stirring head and the pressing wheel above the operation platform. The non-needle stirring head welds the weld of the bent nickel foam plate, and the pressing wheel extrudes the weld of the nickel foam plate.

2. The friction stir welding equipment for a metal foam screen pipe according to claim 1, wherein: The mandrel is a cylindrical die, and both ends of the mandrel are rollingly connected with the mandrel seat through a rolling mechanism.

3. A friction stir welding device for a metal foam screen pipe according to claim 1 or 2, characterized in that: The curling die includes a left die, a right die and an upper die. The left die and the right die are both slidably arranged on both sides of the mandrel. The upper die is slidably arranged at the upper end of the mandrel. The left die, the right die and the upper die are all provided with sliders, and the sliders are placed in the track to slide.

4. A friction stir welding device for a metal foam screen pipe according to claim 3, characterized in that: The left die, the right die and the upper die are all connected with a telescopic mechanism, and the telescopic mechanism drives the left die, the right die and the upper die to slide in the corresponding track.

5. A friction stir welding device for a metal foam screen pipe according to claim 1 or 2 or 4, characterized in that: The guiding mechanism includes a first guide rail and a second guide rail. The first guide rail is placed on the upper surface of the welding table plate. The first guide rail changes the displacement of the non-needle stirring head and the pressing wheel in the front-back direction. The second guide rail is perpendicular to the welding table plate, and the second guide rail changes the displacement of the non-needle stirring head and the pressing wheel in the up-down direction.

6. A friction stir welding device for a metal foam screen pipe according to claim 1 or 2 or 4, characterized in that: The non-needle stirring head includes a shoulder. A clamping rod is arranged at the top of the shoulder. A stirring surface is arranged at the bottom of the shoulder. The clamping rod, the shoulder and the stirring surface are of split connection. The pressing wheel is connected with a pressing wheel bracket through a pin shaft. The clamping rod and the pressing wheel bracket are both fixed on the moving block.

7. A friction stir welding method for a foamed metal screen pipe, which uses the friction stir welding equipment for a foamed metal screen pipe according to any one of claims 1 to 6, characterized in that: It includes the following steps S1: Make a nickel foam metal drum through the curling device with the nickel foam plate. S2: Clean both sides of the groove of the nickel foam metal drum to be welded. S3: Install the nickel foam metal drum, make the weld at the direct upper position, and the clamping mechanism presses the nickel foam metal drum tightly. S4: Uniformly spread the welding flux between the welds and compact it with the pressing wheel. S5: Adjust the position of the non-needle stirring head to make it contact with the weld. S6: Start welding to make the nickel foam metal drum welded into a single forming.

8. A friction stir welding method for a metal foam screen pipe according to claim 7, characterized in that: The S1 includes the following steps S11: Place the nickel foam plate directly below the mandrel. S12: The telescopic mechanism drives the left die, the right die and the upper die to extrude towards the mandrel direction respectively, making the nickel foam plate bend into an annular column shape to form a nickel foam metal drum.

9. A friction stir welding method for a metal foam screen pipe according to claim 7 or 8, characterized in that: The S4 includes the following steps S41: Uniformly spread 0.3 mm - 0.5 mm of welding flux between the welds and compact it with the pressure wheel; S42: Adjust the position of the pressure wheel so that the middle part of the pressure wheel vertically extrudes the weld by 2 mm - 3 mm. Uniformly spread 0.3 mm - 0.5 mm of welding flux again at both ends of the weld and compact it with the pressure wheel.

10. A friction stir welding method for a metal foam screen pipe according to claim 7 or 8, characterized in that: The said S6 includes the following steps, S61: Adjust the position of the non - needle stirring head to make it move downward. After the non - needle stirring head contacts the foam metal reel, wait for the non - needle stirring head to turn hot and red, then click the cycle start button, and at this time the welding starts; S62: After the non - needle stirring head has passed 30 mm from the starting point, adjust the feed rate knob to 40%; S63: During the welding process, adjust the height of the non - needle stirring head to maintain the red - hot state of the non - needle stirring head; S64: When the non - needle stirring head reaches 30 mm from the end point, adjust the feed rate knob to 30% until the non - needle stirring head reaches the end of the weld; S65: When the non - needle stirring head reaches the end of the weld, lift the non - needle stirring head upward, click the reset button, the main shaft stops rotating, and adjust the non - needle stirring head away from the foam metal reel to complete the welding of the weld.

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