Pipe fitting welding device and pipe fitting welding method

Abstract

The present invention discloses a pipe welding device, which relates to the field of welding devices and includes a base, on which two side plates are mounted via a slide, and work plates are rotatably mounted on the tops of the two side plates. The sides of the two work plates that are close to each other pass through a rotating shaft. When the two side plates are close to each other, the work plates form a V-shaped structure under their own gravity. The upper sides of the two work plates are each provided with a groove, and a semi-cylindrical ring is mounted inside the groove. A semi-circular coil is mounted inside the semi-cylindrical ring. The two semi-cylindrical rings can be snapped together to form a complete cylindrical ring. The semi-circular coils are combined into a complete coil structure, which can generate an eddy current magnetic field when energized. When welding a pipe, the present invention can directly heat the weld of the pipe, thereby improving the firmness of the weld. When in use, the semi-cylindrical rings only need to be spliced ​​into a cylindrical ring to achieve heating of the pipe. The use is very convenient, and the semi-cylindrical rings can be used alone to meet different usage conditions.

Description

Technical Field

[0001] The present invention relates to the field of welding devices, in particular to a pipe welding device and a pipe welding method. Background Art

[0002] Pipelines, as a common transmission device, are generally used to transport fluids such as gases and liquids. They are widely used in water supply, drainage, heating, long-distance transportation of oil and natural gas, and agricultural irrigation. They are mainly divided into metal pipes and non-metallic pipes. When installing metal pipes, multiple sections of pipes need to be directly welded together to form a complete long-distance pipeline. Welding is generally performed at room temperature. During welding, the welding rod is subjected to high temperatures and melts into molten iron, thereby connecting the pipes at both ends. However, due to the considerable temperature difference between the molten iron and the metal pipe it contacts when it melts, the sudden cooling of the molten iron during welding can easily lead to the formation of pores and inclusions in the weld area, resulting in a weak weld. In addition, excessive cooling can cause impurities to accumulate in the weld, and under the influence of the weld stress field, crystallization cracks can easily occur in the weld. Summary of the Invention

[0003] The object of the present invention is to provide a pipe welding device and a pipe welding method to solve the problems raised in the above background technology.

[0004] To solve the above technical problems, the present invention provides the following technical solutions: a pipe welding device, comprising a base, two side plates mounted on the base via a slide groove, the two side plates being capable of sliding horizontally on the upper portion of the base, a motor being fixedly mounted on the base, a screw being fixedly mounted on the output end of the motor, the screw passing through the side plates and being connected to the side plates via threads;

[0005] The tops of the two side panels are respectively installed with working plates through hinge supports. The sides of the two working plates that are close to each other are rotated and installed through the rotating shaft. When the two side panels are close to each other, the working plates form a V-shaped structure under their own gravity.

[0006] There are grooves on the upper sides of the two working plates, and semi-cylindrical rings are installed inside the grooves. Semi-annular coils are installed inside the semi-cylindrical rings. The two semi-cylindrical rings can be snapped together to form a complete cylindrical ring. When the cylindrical ring is formed, the semi-annular coils are combined into a complete coil structure, which can generate an eddy current magnetic field when power is applied.

[0007] Preferably, at least one semi-cylindrical ring is placed in each groove, and the open sides of the semi-cylindrical rings in different grooves correspond to each other;

[0008] Each semi-cylindrical ring is connected to a wire, which is connected to the semi-annular coil and is used to provide alternating current to the coil.

[0009] Preferably, a mounting plate is mounted on the bottom end surface of the semi-cylindrical ring via a rotating shaft, the semi-cylindrical ring can rotate on the mounting plate, the placement angle of the semi-cylindrical ring can be adjusted, and the mounting plate is connected to the groove via bolts;

[0010] A portion of the semi-annular coil extends from one side wall of the semi-cylindrical ring opening to form a plug-in portion, while the other side wall of the semi-cylindrical ring opening is provided with a concave hole structure for plugging with the plug-in portion of another semi-cylindrical ring.

[0011] Preferably, a connecting strip is fixedly installed on the top of the semi-cylindrical ring. When the two semi-cylindrical rings are spliced ​​together, the two connecting strips are in close contact with each other and are connected by bolts.

[0012] Preferably, the two semi-cylindrical rings can be taken out of the groove and directly snapped together, and the mounting plate is in a vertical position with respect to the semi-cylindrical rings. The mounting plates on the two semi-cylindrical rings are directly fixed together by bolts to form a connection portion.

[0013] Preferably, one side of the connecting part is connected to a U-shaped frame by bolts, a connecting rod is fixedly installed on the other end of the U-shaped frame, and a clamping ring is fixedly installed on the other end of the connecting rod. The upper side of the clamping ring is an open structure, and the clamping ring can be directly clamped on the outside of the pipe through the opening structure to achieve installation of the clamping ring.

[0014] Preferably, the opening of the clamping ring is set as an outward-facing octagonal opening, with a larger opening at the top and a smaller opening at the bottom, so as to facilitate clamping of the pipe;

[0015] A bolt hole is also provided at the opening of the clamping ring, and a full-thread bolt is installed in the bolt hole to fix the clamping ring.

[0016] Preferably, connecting holes are provided on both sides of the two semi-cylindrical rings, and the two connecting holes are connected together by connecting columns, and connecting blocks matching the connecting holes are fixedly installed on the side walls at both ends of the connecting columns.

[0017] Preferably, an electric heating wire is also installed inside the base.

[0018] A pipe welding method adopts the above-mentioned pipe welding device. When welding the pipe, according to the diameter of the pipe, the motor is first rotated with the lead screw to make the two working plates in a V-shaped structure, and then the pipe to be welded is placed on the working plate, and the two semi-cylindrical rings are clamped together to form an integral structure. Then, alternating current is passed through the semi-annular coil to generate eddy current to heat the pipeline welding part, and then the pipe is welded. After welding is completed, the welding point can be continuously heated, and the cooling time is controlled by changing the current to gradually cool the welding point.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention uses a semi-cylindrical ring and a semi-annular coil to directly heat the weld of the pipeline when welding the pipeline, thereby improving the firmness of the weld and making the weld smoother. In addition, when in use, it is only necessary to splice the semi-cylindrical rings into a cylindrical ring to achieve heating of the pipeline, which is very convenient to use. The semi-cylindrical ring can be used alone to meet different usage conditions and is suitable for welding long pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the whole of the present invention;

[0022] Figure 2 This is an overall cross-sectional view of the working plate of the present invention in a horizontal state;

[0023] Figure 3 This is an overall cross-sectional view of the working plate of the present invention in a V-shaped state;

[0024] Figure 4 is a cross-sectional view of the semi-cylindrical ring splicing structure of the present invention;

[0025] Figure 5 This is a cross-sectional view of the semi-cylindrical ring of the present invention when used alone;

[0026] Figure 6 A structural diagram of two cylindrical rings used in the present invention;

[0027] Figure 7 This is a structural diagram of the cylindrical ring of the present invention used alone;

[0028] Figure 8 This is a structural diagram of a semi-cylindrical ring of the present invention;

[0029] Figure 9 This is a tensile fracture diagram of the weld when it is not heated;

[0030] Figure 10 This is a tensile fracture diagram of the weld during heating of the present invention;

[0031] Figure 11 This is a microstructure diagram of the weld alloy when not heated;

[0032] Figure 12 This is a microstructure diagram of the weld alloy during heating according to the present invention.

[0033] In the figure: 1. Base; 2. Screw rod; 3. Side plate; 4. Working plate; 5. Groove; 6. Mounting plate; 7. Connecting hole; 8. Semi-cylindrical ring; 9. Wire; 10. Semi-annular coil; 11. Connecting block; 12. Connecting column; 13. Connecting strip; 14. U-shaped frame; 15. Connecting rod; 16. Snap ring; 17. Side wall; 18. Outer eight-shaped opening; 19. Slide groove; 20. Electric heating wire; 21. Motor. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Example 1

[0036] Please refer to the figure, including a base 1, the base 1 is provided with a rectangular parallelepiped slide 19, the interior of the slide 19 is slidably mounted with two side panels 3, the two side panels 3 can slide horizontally on the upper portion of the base 1, as shown in FIG. Figure 1-3 In addition to being a rectangular parallelepiped structure, the chute 19 can be set to a T-shaped structure according to actual use needs. There is no limitation on the structure and shape, as long as the side panel 3 can slide horizontally inside the chute 19.

[0037] An extension plate is fixedly mounted on one side wall of the base 1, and a motor 21 is fixedly mounted on the extension plate through anchor bolts. A screw rod 2 is fixedly mounted on the output shaft of the motor 21, and the motor 21 can rotate with the screw rod 2. The screw rod 2 passes through the side plate 3 and is connected to the side plate 3 through a threaded connection. Figure 1 shown.

[0038] The screw thread on the screw rod 2 is symmetrically arranged with its center as the center, and the screw thread spiral directions on the screw rod 2 are opposite. When the screw rod 2 rotates, it can bring the side plates 3 closer to or away from each other in the inside of the chute 19.

[0039] The tops of the two side panels 3 are each mounted with a work panel 4 via a hinged support. The hinged support is fixedly connected to the bottom of the work panel 4, and the top of the side panel 3 is rotatably connected to the hinged support via a rotating shaft, allowing the side panels 3 to rotate around the hinged support. The two work panels 4 are connected together on the side close to each other via a rotating shaft, and the two work panels 4 can rotate downward around the rotating shaft. In a normal state, the two work panels 4 are both horizontal, and the two side panels 3 are located at the extreme edges of the chute 19. The work panels 4 only bear their own weight. Figure 1-3 shown.

[0040] When the two side plates 3 are driven by the screw rod 2 to move closer to each other, the working plate 4 moves downward under the action of its own gravity to form a V-shaped structure, as shown in FIG. Figure 3 According to the diameter of the pipe to be welded, the opening size of the V-shaped structure is adjusted so that the two pipe sections can be exactly on the same welding surface.

[0041] The upper sides of the two working plates 4 are provided with grooves 5, such as Figure 1 As shown, the grooves on the two working plates 4 are symmetrically arranged. The groove 5 is a rectangular parallelepiped structure with an open top, and a plurality of threaded holes are provided inside the groove 5.

[0042] A semi-cylindrical ring 8 is mounted inside the groove 5. Made of insulating ceramic, it's heat-resistant and insulated, ensuring safety during use. Bolted directly to the bottom of the groove 5, the semi-cylindrical ring 8 facilitates both installation and removal. The open sides of the semi-cylindrical rings 8 in the two grooves 5 correspond to each other. Connecting strips with threaded holes are welded to the rear sides of the two semi-cylindrical rings 8.

[0043] A semi-annular coil 10 is installed inside the semi-cylindrical ring 8. Figure 1 and Figure 4 As shown, the two semi-cylindrical rings 8 can be snapped together to form a complete cylindrical ring, and when the cylindrical ring is formed, the semi-annular coil 10 is combined into a complete coil structure, which can generate an eddy current magnetic field when energized. When welding a pipeline, the semi-cylindrical rings 8 are spliced ​​together to wrap the part of the pipeline to be welded together, and the coil is used to heat it. After heating, the cylindrical rings are removed and welded. After welding is completed, the semi-cylindrical rings can be spliced ​​together again and the welded part is heated to slow down the heat dissipation time of the welded part, so that the welding effect of the welded part is better. In this method, only a pair of semi-cylindrical rings 8 are provided, and only one cylindrical ring can be formed.

[0044] When splicing two semi-cylindrical rings, first splice the two semi-cylindrical rings 8 together to form a cylindrical ring, and then use bolts to fix the cylindrical ring on the bolt holes of the groove 5 to achieve the fixation between the semi-cylindrical rings 8.

[0045] Each semi-cylindrical ring 8 is connected to a wire 9, which is in communication with a semi-annular coil 10 and is used to provide alternating current to the coil, causing the coil to generate eddy current to heat the pipeline.

[0046] In a further embodiment, when welding two pipes, four semi-cylindrical rings 8 are provided, and two semi-cylindrical rings 8 are placed in each groove 5. The opening sides of the semi-cylindrical rings 8 in each groove 5 face the same direction, that is, the semi-cylindrical ring 8 in one groove corresponds to the opening side of the semi-cylindrical ring 8 in the other groove. When welding two pipes, two of the semi-cylindrical rings 8 are spliced ​​together, and the welding point of one pipe is heated, while the remaining two semi-cylindrical rings 8 are spliced ​​together, and the welding point of the other pipe is heated to a sufficient temperature between 200-260 degrees Celsius. When the iron pipe turns red, the two sections of the pipe can be heated. In the process of welding the pipes, since the two sections of the pipe are heated separately, there is no need to stop heating the two sections of the pipe during welding. This avoids the sudden drop in temperature caused by the direct contact between the molten iron at the welding point and the two sections of the pipe, which causes the molten iron to suddenly solidify and lead to a loose weld. This makes the temperature change of the molten iron at the welding point more stable, making the welding point more secure. Figure 6 shown.

[0047] When heating two pipe sections, the weld can be heated in a cylindrical ring. Once heated to a sufficient temperature, the pipe is pushed forward to allow it to escape from the cylindrical ring and weld the two sections. Alternatively, the weld can be extended directly from the cylindrical ring and the area surrounding the weld heated, which can also heat the welded area and improve the welding effect.

[0048] After heating, the semi-cylindrical ring 8 can be removed by simply removing the bolts.

[0049] Example 2

[0050] The difference from Example 1 is that:

[0051] When adjusting the opening of the V-shaped structure, the size of the V-shaped opening is different for different pipes. Therefore, in order to facilitate the adjustment and use of the semi-cylindrical ring 8, when the opening of the V-shaped structure is different, in order to ensure that the semi-cylindrical ring 8 can always be spliced ​​into a cylindrical ring, a rotating shaft is fixedly installed on the bottom end face of the semi-cylindrical ring 8, and a mounting plate 6 is installed on the outside of the rotating shaft. The mounting plate 6 has a space for the semi-cylindrical ring 8 to rotate. The semi-cylindrical ring 8 can rotate on the mounting plate 6, thereby adjusting the angle between the semi-cylindrical ring 8 and the mounting plate, and further adjusting the placement angle of the semi-cylindrical ring 8. The mounting plate 6 has two bolt holes, and the mounting plate 6 is connected to the groove 5 by bolts, such as Figure 8 shown.

[0052] The mounting plate 6 is installed in the groove, and its inclination angle is the same as that of the working plate 4. Therefore, when using the semi-cylindrical ring 8, the angle between the semi-cylindrical ring 8 and the mounting plate 6 can be adjusted to adjust the angle between the semi-cylindrical ring 8 and the working plate 4. The semi-cylindrical ring 8 is always in a vertically placed state, which facilitates the splicing of the two semi-cylindrical rings 8 when in use.

[0053] In order to ensure a more stable connection between the two semi-cylindrical rings 8, a portion of the semi-annular coil 10 extends from one side wall of the semi-cylindrical ring 8 on the open side to form a plug-in portion, while the other side wall of the semi-cylindrical ring 8 on the open side is provided with a recessed hole structure for plugging into the plug-in portion of the other semi-cylindrical ring 8. The plug-in portion of the two semi-cylindrical rings 8 plugs into the recessed hole structure of the other semi-cylindrical ring, thereby ensuring a more stable connection between the two semi-cylindrical rings 8 and avoiding slippage between the two semi-cylindrical rings 8. At the same time, it also ensures that the semi-annular coils 10 are absolutely installed together to avoid poor contact. A connecting strip 13 is welded to the top of the semi-cylindrical ring 8, and a bolt hole is provided on the connecting strip 13. When the two semi-cylindrical rings 8 are spliced ​​together, the two connecting strips 13 are in close contact with each other and are connected by bolts. The two connecting strips 13 connect the two semi-cylindrical rings 8 together, making the two semi-cylindrical rings more stable.

[0054] An electric heating wire 20 is also installed inside the working plate 4. Figure 2 As shown, the electric heating wire 20 can heat the working plate 4. When two semi-cylindrical rings 8 are used, the plate structure can also be welded, or the wires on the PCB can be welded. When welding the plate or PCB, the side plate 3 is at the edge of the slide 19, the two working plates 4 are kept in a horizontal state, one of the semi-cylindrical rings 8 is fixed, the plate to be welded is placed in the groove 5, and then the other semi-cylindrical ring 8 is fixed on the other side to achieve extrusion between the plates, and then the electric heating wire 20 is turned on to heat the plate. When the plate temperature rises to 150-200 degrees Celsius, the plate can be welded.

[0055] When soldering the PCB, since the PCB is soldered in batches, it is necessary to position the two semi-cylindrical rings 8 during soldering. First, one of the semi-cylindrical rings 8 is fixed with bolts. Then, the PCB is fitted with the bottom of the fixed semi-cylindrical ring 8. The other semi-cylindrical ring 8 is fixed to the other side of the symmetry. This allows the two semi-cylindrical rings 8 to be positioned. When soldering the PCB, the bottom of the PCB is placed against one of the semi-cylindrical rings 8. The PCB is then positioned downwardly so that the PCB is secured between the two semi-cylindrical rings 8. After installation, the electric heating wire 20 is operated. When the electric heating wire 20 is operated, the PCB is heated to between 80 and 90 degrees Celsius. The wire can then be soldered to the PCB. At this temperature, the soldering of the wire is more secure, and there is no risk of soldering becoming unstable, which can occur due to the solder solidifying instantly after being separated from the soldering iron.

[0056] In this embodiment, to ensure stability between the two semi-cylindrical rings 8 and prevent them from rotating on the mounting plate 6, connecting holes 7 are formed on either side of the two semi-cylindrical rings 8. Connecting blocks 11 are inserted into the two connecting holes 7. Both the connecting blocks 11 and the inserting holes are rectangular parallelepiped structures, preventing them from rotating. Connecting posts 12 are fixedly mounted on the outsides of the connecting blocks 11, and the connecting blocks 11 are located at the edges of the connecting posts 12. The connecting posts 12 connect the two semi-cylindrical rings 8 into a single unit, providing greater stability during PCB installation.

[0057] When welding the pipe in use, the semi-cylindrical ring 8 can also be directly taken out for use. Figure 7 As shown, the two semi-cylindrical rings 8 are taken out of the groove 5 and directly clamped together, and the pipe to be welded is clamped inside it. The mounting plate 6 is in a perpendicular state to the semi-cylindrical ring 8. The two mounting plates 6 are directly fixed together by bolts to form a connection part, so that the semi-cylindrical ring 8 can be directly used to heat the pipe.

[0058] The connection of the connecting portion is provided with a U-shaped frame 14, such as Figure 7 As shown, a bolt hole is provided on the U-shaped frame 14, and the U-shaped frame 14 is connected to the connecting portion by bolts. A connecting rod 15 is fixedly installed on the other end of the U-shaped frame 14, and a clamping ring 16 is fixedly installed on the other end of the connecting rod 15. The upper side of the clamping ring 16 is an open structure. The clamping ring 16 can be directly clamped on the outside of the pipe through the open structure. The clamping ring 16 is installed together with the pipe to be welded to achieve the fixation of the clamping ring and the cylindrical ring. A strong magnet is set on the inner side of the clamping ring 16, which can directly adsorb iron pipes together to achieve preliminary fixation of the clamping ring 16. If the welding part of the pipe is relatively small, it can be fixed with a magnet.

[0059] In order to facilitate the installation of the clamping ring 16 and the pipeline, the opening of the clamping ring 16 is set as an outward eight-shaped opening 18, with a large opening at the top and a small opening at the bottom. The side with the larger opening is directly in contact with the side wall of the pipeline. When the clamping ring 16 is pressed, outward pressure is provided to the clamping ring 16, which facilitates the opening of the clamping ring 16, so that it can be more conveniently connected to the pipeline.

[0060] A vertical side wall 17 is provided at the opening of the clamping ring 16, and a bolt hole is also provided on the vertical side wall. A fully threaded bolt is installed in the bolt hole to fix the clamping ring 16. When the pipeline needs to be welded for a long time, the heating time is relatively long, which will cause heat to be transferred to the clamping ring. Under high temperature conditions, the magnet can easily lose its magnetism, so bolts are provided to improve the firmness of the clamping ring installation.

[0061] When welding two sections of pipes, four semi-cylindrical rings 8 can be used to combine into two cylindrical rings to heat and weld the joints of the two pipes.

[0062] While examples of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A pipe welding device, characterized in that: The invention comprises a base (1), two side plates (3) are mounted on the base (1) via a slide groove (19), the two side plates (3) are capable of sliding horizontally on the upper part of the base (1), a motor (21) is fixedly mounted on the base (1), a screw rod (2) is fixedly mounted on the output end of the motor (21), the screw rod (2) passes through the side plates (3), and is connected to the side plates (3) via a threaded connection; The tops of the two side panels (3) are respectively provided with working panels (4) via hinged supports. The two working panels (4) are rotatably mounted on the sides close to each other via a rotating shaft. When the two side panels (3) are close to each other, the working panels (4) form a V-shaped structure under their own weight. A groove (5) is provided on the upper side of each of the two working plates (4), a semi-cylindrical ring (8) is installed inside the groove (5), and a semi-annular coil (10) is installed inside the semi-cylindrical ring (8). The two semi-cylindrical rings (8) can be clamped together to form a complete cylindrical ring, and when the cylindrical ring is formed, the semi-annular coil (10) is combined into a complete coil structure, which can generate an eddy current magnetic field when powered. The bottom end surface of the semi-cylindrical ring (8) is mounted with a mounting plate (6) via a rotating shaft. The semi-cylindrical ring (8) can rotate on the mounting plate (6) and the placement angle of the semi-cylindrical ring (8) can be adjusted. The mounting plate (6) and the groove (5) are connected by bolts. The semi-annular coil (10) extends from a side wall of the opening side of the semi-cylindrical ring (8) to form a plug-in portion, while the other side wall of the opening side of the semi-cylindrical ring (8) is provided with a concave hole structure for plugging with the plug-in portion of the other semi-cylindrical ring (8); A connecting strip (13) is fixedly mounted on the top of the semi-cylindrical ring (8). When the two semi-cylindrical rings (8) are spliced ​​together, the two connecting strips (13) are in close contact with each other and are connected by bolts.

2. A pipe welding device according to claim 1, characterized in that: At least one semi-cylindrical ring (8) is placed in each of the grooves (5), and the opening sides of the semi-cylindrical rings (8) in different grooves (5) correspond to each other; Each semi-cylindrical ring (8) is connected to a wire (9), which is connected to a semi-annular coil (10) and is used to provide alternating current to the coil.

3. The pipe welding device according to claim 1, characterized in that: The two semi-cylindrical rings (8) can be taken out of the groove (5) and directly snapped together, and the mounting plate (6) is in a state perpendicular to the semi-cylindrical rings (8). The mounting plates (6) on the two semi-cylindrical rings (8) are directly fixed together by bolts to form a connecting portion.

4. A pipe welding device according to claim 3, characterized in that: One side of the connecting portion is connected to a U-shaped frame (14) via a bolt, the other end of the U-shaped frame (14) is fixedly mounted with a connecting rod (15), the other end of the connecting rod is fixedly mounted with a clamping ring (16), the upper side of the clamping ring (16) is an open structure, and the clamping ring (16) can be directly clamped on the outside of the pipeline through the open structure, thereby achieving the installation of the clamping ring (16).

5. The pipe welding device according to claim 4, characterized in that: The opening of the clamping ring (16) is configured as an outward-facing octagonal opening (18), with a large opening at the top and a small opening at the bottom, so as to facilitate clamping of the pipeline; The opening of the clamping ring (16) is also provided with a bolt hole, in which a full-thread bolt is installed to fix the clamping ring (16).

6. The pipe welding device according to claim 1, characterized in that: Connecting holes (7) are also provided on both sides of the two semi-cylindrical rings (8). The two connecting holes (7) are connected together through a connecting column (12). Connecting blocks (11) matching the connecting holes (7) are fixedly installed on the side walls of both ends of the connecting column (12).

7. The pipe welding device according to claim 1, characterized in that: An electric heating wire (20) is also installed inside the base (1).

8. A pipe welding method, using the pipe welding device according to any one of claims 1 to 7, characterized in that: When welding pipe fittings, firstly, the motor (21) is rotated with the screw (2) according to the diameter of the pipe fitting, so that the two working plates (4) are in a V-shaped structure, and then the pipe fitting to be welded is placed on the working plate (4), and the two semi-cylindrical rings (8) are clamped together to form an integral structure, and then alternating current is passed through the semi-annular coil (10) to generate eddy current to heat the pipe welding part, and then the pipe fitting is welded. After welding is completed, the welding part can be continuously heated, and the cooling time can be controlled by changing the current to gradually cool the welding part.

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