A welding fixture and welding method for transition elbows

Abstract

This invention discloses a welding fixture and method for transition elbows, including a welding platform and a positioning component. The positioning component is set on the welding platform and includes a clamping device, a clamping device, a support block, and a positioning block. The positioning block has a rectangular structure. One end of the clamping device is set on the welding platform, and the other end of the clamping device is located above the lowest positioning platform. The two clamping ends of the clamping device are located on both sides of the lowest positioning platform. This application achieves simultaneous fixing of plate 1, plate 2, plate 3, and plate 4 by coordinating the welding platform and the positioning component, thereby realizing a one-time welding forming operation, ensuring welding stability and welding accuracy, improving work efficiency, and ensuring the quality of the transition elbow.

Description

Technical fields:

[0001] This invention relates to the field of machining technology, and in particular to a welding fixture and welding method for transition elbows. Background technology:

[0002] For the aesthetics and structural strength of rail transit vehicles, the connection between the driver's cab frame and the car body needs to be curved. However, due to the large size of the driver's cab frame and the car body, it is difficult and inconvenient to perform curved treatment on the ends of both. The existing method is to process the curved part separately to form a transition bend. When connecting the driver's cab frame and the car body, the transition bend is set between the driver's cab frame and the car body for splicing. This eliminates the need to perform curved treatment on the ends of the driver's cab frame and the car body, reducing the manufacturing difficulty of the driver's cab frame and the car body.

[0003] The transition elbow is made of four plates welded together, such as Figure 8 As shown, plate A1 and plate A4 are arranged parallel to each other vertically. Plate A2 and plate A3 clamp plate A4, and the bottoms of plate A2 and plate A3 are placed on plate A1. Plate A2 and plate A3 are parallel to each other, and there is a gap between plate A1 and plate A4. Meanwhile, plate A2 and plate A3 are 8mm thick irregular aluminum plates, and plate A1 and plate A4 are 8mm aluminum plate bent parts. Due to the special shape of the transition bend, it is subjected to large forces during use and needs to ensure dimensional accuracy. The existing step-by-step fixed welding method is prone to plate displacement and deformation, which affects the quality of the transition bend and results in a low yield. Summary of the Invention:

[0004] The technical problem to be solved by this invention is that the existing step-by-step fixed welding method is prone to causing plate displacement and deformation, which affects the quality of transition elbows and results in low yield.

[0005] To solve the above-mentioned technical problems, the present invention provides a technical solution: a welding fixture for transition elbows, including a welding platform and a positioning component, wherein the positioning component is disposed on the welding platform, characterized in that: the positioning component includes a clamping device, a clamping device, a support block and a positioning block, the positioning block is generally rectangular in structure, and the top of the positioning block is provided with three positioning platforms arranged in a stepped manner from high to low, the lowest positioning platform extending forward along the arrangement direction of the three positioning platforms to form a bottom suspended protrusion, and the two sides of the protrusion and the left and right sides of the lowest positioning platform form a recessed platform;

[0006] The support block is movably disposed on the welding platform in the extension direction of the protrusion;

[0007] One end of the clamp is disposed on the welding platform, and the other end of the clamp is located above the lowest positioning platform;

[0008] The two clamping ends of the clamp are located on either side of the lowest positioning platform.

[0009] Furthermore, the welding platform is provided with at least four through holes arranged in a matrix.

[0010] Furthermore, the bottom of the positioning block is provided with a positioning and fixing screw hole. The positioning and fixing bolt passes through the through hole and is screwed into the positioning and fixing screw hole to fix the positioning block.

[0011] Furthermore, the support block is provided with support fixing holes, and support fixing bolts pass through the support fixing holes and through holes to fix the support block.

[0012] Furthermore, the clamping device includes a vertical rod, a horizontal rod, a screw rod, and a handle. One end of the vertical rod is provided with a clamping and fixing screw hole. A clamping and fixing bolt passes through the through hole and is screwed into the clamping and fixing screw hole to fix the through hole on the welding platform. The other end of the vertical rod is provided with a sleeve. One end of the horizontal rod extends into the sleeve and is provided with a screw hole. One end of the screw rod is screwed into the screw hole and is positioned above the lowest positioning platform. The handle is located at the other end of the screw rod, and the axis of the handle is perpendicular to the axis of the screw rod.

[0013] Furthermore, the clamping device includes a U-shaped rod, a clamping arm, and a clamping rod. One end of the U-shaped rod extends forward, and one end of the clamping arm is fitted onto the extended end of the U-shaped rod. The clamping rod is screwed into a screw hole on the other end of the clamping arm, and the clamping rod end of the clamping arm and the other end of the U-shaped rod form two clamping ends of the clamping device.

[0014] To solve the above-mentioned technical problems, another technical solution provided by the present invention is: a welding method for transition elbows according to the welding fixture described above, the steps of which are:

[0015] Step 1: The positioning block, support block, and clamping device are fixed on the welding platform;

[0016] Step 2: Place plate 1 horizontally between the protrusion and the welding platform, with one end of plate 1 in contact with the bottom of the positioning block. Adjust the position of the support block on the welding platform so that the support block abuts against the other end of plate 1, positioning plate 1 within the space enclosed by the positioning block, protrusion, support block, and welding platform.

[0017] Step 3: Plate 2 and Plate 3 are positioned on the left and right sides of the protrusion. The bottoms of Plate 2 and Plate 3 are placed on Plate 1. The left side of the bottom of Plate 2 and Plate 3 abuts against the concave platform. The left side of the top of Plate 2 and Plate 3 is placed on a positioning platform in the middle, and its ends abut against the vertical connecting surface between the highest positioning platform and the middle positioning platform. The two clamping ends of the clamping device clamp the bottoms of Plate 2 and Plate 3 respectively, positioning Plate 2 and Plate 3 on the positioning surface formed by Plate 1, the protrusion, the concave platform, the highest positioning platform, and the vertical connecting surface.

[0018] Step 4: Plate 4 is placed on the lowest positioning platform, and the left and right sides of Plate 3 are in contact with Plate 2 and Plate 3. One end of Plate 4 rests on the vertical connecting surface between the middle positioning platform and the lowest positioning platform, and the other end of the clamping device rests on Plate 4, positioning Plate 4 within the space enclosed by the lowest positioning platform, Plate 2, Plate 3 and the vertical connecting surface.

[0019] Step 5: Weld the positioned plates 1, 2, 3 and 4.

[0020] Furthermore, in step one, the process of fixing the positioning block, support block, and clamping device onto the welding platform is as follows:

[0021] The positioning and fixing screw holes at the bottom of the positioning block correspond to the through holes. The positioning and fixing bolts pass through the through holes and are screwed into the positioning and fixing screw holes to achieve the connection between the positioning block and the welding platform.

[0022] The support fixing holes on the support block correspond to the through holes, and the support fixing bolts pass through the through holes and support fixing holes to connect the support block to the welding platform.

[0023] One end of the clamp is provided with a clamping and fixing screw hole, which corresponds to the through hole. The clamping and fixing bolt passes through the through hole and is screwed into the clamping and fixing screw hole to realize the connection between the clamp and the welding platform.

[0024] Furthermore, in step three, the process of clamping the two clamping ends of the clamping device with the bottom of plate two and plate three respectively is as follows: the two clamping ends of the clamping device are respectively located on both sides of plate two and plate three, the clamping arm slides on the extension end of the U-shaped rod so that the two clamping ends of the clamping device contact plate two and plate three respectively, the clamping rod is rotated, and under the action of the screw hole, the clamping rod end that passes through the clamping arm and the other end of the U-shaped rod clamp plate two and plate three.

[0025] Furthermore, in step four, the process of the other end of the clamping device abutting against plate four is as follows: rotate the upright rod so that the axis of the sleeve is above the lowest positioning platform, one end of the rod extends into the sleeve and the screw hole at the other end of the crossbar is above the lowest positioning platform, one end of the screw is screwed into the screw hole from top to bottom, and its end abuts against plate four.

[0026] The beneficial effects of this invention are as follows:

[0027] 1. This application achieves simultaneous fixing of plate 1, plate 2, plate 3, and plate 4 through the coordinated use of the welding platform and positioning components, thereby realizing a one-time welding process. This ensures welding stability and precision, improves work efficiency, and guarantees the quality of the transition elbow.

[0028] 2. In this application, the positioning block, welding platform and support block cooperate to fix plate one; the positioning block, protrusion, clamp and plate one cooperate to fix plate two and plate three; the positioning block, plate two, plate three and clamp cooperate to fix plate four, thereby realizing the rapid assembly and simultaneous fixation of four plates, preventing the plates from moving and ensuring the quality of the transition bend.

[0029] 3. In this application, the three positioning platforms on the positioning block are set and extend outward to form a bottom-suspended protrusion. The two sides of the protrusion and the left and right sides of the positioning platform form a recessed platform, which together form a positioning surface for fixing the four plates. The specific shape of the positioning surface matches the shape of the four plates, which plays a judgment role, prevents the plates from being placed incorrectly, facilitates the placement of the plates by personnel, and is easy to operate.

[0030] 4. The welding platform in this application is provided with through holes. The clamping device, clamping device, support block and positioning block are all detachably connected to the welding platform through bolts and through holes, which facilitates position adjustment and does not affect the use of the welding platform.

[0031] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached image description:

[0032] To more clearly illustrate the technical solutions in this invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only eight of the drawings in this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is the main view of this application.

[0034] Figure 2This is the left view of this application.

[0035] Figure 3 This is a top view of this application.

[0036] Figure 4 This is a schematic diagram of the structure of this application.

[0037] Figure 5 This is a structural diagram for fixing profile one.

[0038] Figure 6 This is a structural diagram for fixing profile two.

[0039] Figure 7 This is a structural diagram for fixing profiles three and four.

[0040] Figure 8 This is a schematic diagram of the transition elbow.

[0041] In the diagram, 1-welding platform, 2-pressure clamp, 3-clamping device, 4-support block, 5-positioning block, 6-through hole; 21-upright pole, 22-crossbar, 23-screw, 24-handle, 25-sleeve;

[0042] 31-U-shaped rod, 32-clamping arm, 33-clamping bar;

[0043] 41 - Support fixing bolt;

[0044] 51-Positioning platform, 52-Protrusion, 53-Concave platform;

[0045] A-Transition Elbow, A-Sheet 1, A-Sheet 2, A-Sheet 3, A-Sheet 4. Detailed implementation method:

[0046] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the invention. It should be understood that the accompanying drawings and embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the invention.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] The names of the messages or information exchanged between the multiple devices in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0049] Example 1

[0050] like Figure 1-8 As shown, a welding fixture for transition elbows is disclosed, including a welding platform 1 and a positioning assembly. The positioning assembly is set on the welding platform 1 and includes a clamping device 2, a clamping device 3, a support block 4, and a positioning block 5. The positioning block 5 is generally rectangular in structure. The top of the positioning block 5 is arranged in a stepped manner from high to low with three positioning platforms 51. The lowest positioning platform 51 extends forward along the arrangement direction of the three positioning platforms 51 to form a bottom-suspended protrusion 52, and the two sides of the protrusion 52 form a recess 53 with the left and right sides of the lowest positioning platform 51. The support block 4 is movably set on the welding platform 1 in the extension direction of the protrusion 52. One end of the clamping device 2 is set on the welding platform 1, and the other end of the clamping device 2 is above the lowest positioning platform 51. The two clamping ends of the clamping device 3 are respectively located on both sides of the lowest positioning platform 51.

[0051] The positioning block 5, welding platform 1, and support block 4 work together to fix plate A1. The positioning block 5, protrusion 52, clamp 3, and plate A1 work together to fix plate A2 and plate A3. The positioning block 5, plate A2, plate A3, and clamp 2 work together to fix plate A4. This allows for the rapid assembly and simultaneous fixing of the four plates, preventing them from moving and ensuring the quality of the transition bend.

[0052] Example 2

[0053] like Figure 4-8 As shown, this embodiment is obtained by adding technical features such as through holes 6 on the basis of embodiment one. The other technical features are the same as those in embodiment one. The similarities will not be repeated here. The difference between this embodiment and embodiment one is that at least four through holes 6 are provided on the welding platform 1 in a matrix arrangement.

[0054] In this embodiment, the welding platform 1 is provided with a through hole 6. The clamping device 2, clamping device 3, support block 4 and positioning block 5 are all detachably connected to the welding platform 1 through bolts and through holes 6, which facilitates position adjustment and does not affect the use of the welding platform 1.

[0055] Example 3

[0056] like Figure 1-7 As shown, this embodiment is based on Embodiment 2, with a detailed description of the technical features of the positioning block 5, support block 4, clamping device 2, and clamping device 3. The remaining technical features are the same as in Embodiment 2, and the similarities will not be repeated here. The difference between this embodiment and Embodiment 2 is as follows:

[0057] The bottom of the positioning block 5 is provided with a positioning and fixing screw hole. The positioning and fixing bolt passes through the through hole 6 and is screwed into the positioning and fixing screw hole to fix the positioning block 5.

[0058] The support block 4 is provided with a support fixing hole, and the support fixing bolt 41 passes through the support fixing hole and the through hole 6 to fix the support block 4.

[0059] The clamping device 2 includes a vertical rod 21, a horizontal rod 22, a screw rod 23, and a handle 24. One end of the vertical rod 21 is provided with a clamping and fixing screw hole. The clamping and fixing bolt passes through the through hole 6 and is screwed into the clamping and fixing screw hole to fix the through hole 6 on the welding platform 1. The other end of the vertical rod 21 is provided with a sleeve 25. One end of the horizontal rod 22 extends into the sleeve 25 and the other end of the horizontal rod 22 is provided with a screw hole. One end of the screw rod 23 is screwed into the screw hole and is located above the lowest positioning platform 51. The handle 24 is provided at the other end of the screw rod 23, and the axis of the handle 24 is perpendicular to the axis of the screw rod 23.

[0060] The clamp 3 includes a U-shaped rod 31, a clamping arm 32, and a clamping rod 33. One end of the U-shaped rod 31 extends forward, and one end of the clamping arm 32 is fitted onto the extended end of the U-shaped rod 31. The clamping rod 33 is screwed into a screw hole on the other end of the clamping arm 32. The end of the clamping rod 33 passing through the clamping arm 32 and the other end of the U-shaped rod 31 form two clamping ends of the clamp 3.

[0061] In this embodiment, the positioning block 5 has three positioning platforms 51, which extend outward to form a bottom-suspended protrusion 52. The two sides of the protrusion 52 and the left and right sides of the positioning platform 51 form a recessed platform 53, which together form a positioning surface for fixing the four plates. The specific shape of the positioning surface matches the shape of the four plates, which plays a judgment role, prevents the plates from being placed incorrectly, facilitates the placement of the plates by personnel, and makes the operation convenient.

[0062] The overall technical solution formed by the above embodiments constitutes another technical solution disclosed in this application regarding the process of manufacturing the transition elbow A. This technical solution is: a welding method for a transition elbow, the steps of which are:

[0063] Step 1: Fix the positioning block 5, support block 4 and clamping device 2 on the welding platform 1.

[0064] The process of fixing the positioning block 5, the support block 4, and the clamping device 2 onto the welding platform 1 is as follows:

[0065] The positioning and fixing screw hole at the bottom of the positioning block 5 corresponds to the through hole 6. The positioning and fixing bolt passes through the through hole 6 and is screwed into the positioning and fixing screw hole to realize the connection between the positioning block 5 and the welding platform 1.

[0066] The support fixing hole on the support block 4 corresponds to the through hole 6. The support fixing bolt 41 passes through the through hole 6 and the support fixing hole to realize the connection between the support block 4 and the welding platform 1.

[0067] One end of the clamping device 2 is provided with a clamping and fixing screw hole, which corresponds to the through hole 6. The clamping and fixing bolt passes through the through hole 6 and is screwed into the clamping and fixing screw hole to realize the connection between the clamping device 2 and the welding platform 1.

[0068] Step 2: Place plate A1 horizontally between protrusion 52 and welding platform 1, with one end of plate A1 in contact with the bottom of positioning block 5. Adjust the position of support block 4 on welding platform 1 so that support block 4 abuts against the other end of plate A1, positioning plate A1 within the space enclosed by positioning block 5, protrusion 52, support block 4 and welding platform 1.

[0069] Step 3: Plate 2A2 and Plate 3A3 are placed on the left and right sides of the boss. The bottom of Plate 2A2 and Plate 3A3 is placed on Plate 1A1. The bottom left side of Plate 2A2 and Plate 3A3 abuts against the concave platform 53. The top left side of Plate 2A2 and Plate 3A3 is placed on a positioning platform 51 in the middle, and its end abuts against the vertical connecting surface between the highest positioning platform 51 and the middle positioning platform 51. The two clamping ends of the clamping device 3 clamp the bottom of Plate 2A2 and Plate 3A3 respectively, positioning Plate 2A2 and Plate 3A3 on the positioning surface formed by Plate 1A1, the boss 52, the concave platform 53, the highest positioning platform 51 and the vertical connecting surface.

[0070] The process of clamping the two clamping ends of clamping device 3 with the bottom of plate 2A2 and plate 3A3 is as follows: the two clamping ends of clamping device 3 are located on both sides of plate 2A2 and plate 3A3 respectively. The clamping arm 32 slides on the extension end of U-shaped rod 31 so that the two clamping ends of clamping device 3 contact plate 2A2 and plate 3A3 respectively. The clamping rod 33 is rotated. Under the action of the screw hole, the end of the clamping rod 33 that passes through the clamping arm 32 and the other end of U-shaped rod 31 clamp plate 2A2 and plate 3A3.

[0071] Step 4: Place plate 4A4 on the lowest positioning platform 51, with the left and right sides of plate 3A3 in contact with plate 2A2 and plate 3A3. One end of plate 4A4 rests on the vertical connecting surface between the middle positioning platform 51 and the lowest positioning platform 51, and the other end of the clamping device 2 rests on plate 4A4, positioning plate 4A4 within the space enclosed by the lowest positioning platform 51, plate 2A2, plate 3A3, and the vertical connecting surface.

[0072] The process of pressing the other end of the clamping device 2 against the plate 4A4 is as follows: rotate the upright 21 so that the axis of the sleeve 25 is above the lowest positioning platform 51, one end of the rod extends into the sleeve 25 and the screw hole at the other end of the crossbar 22 is above the lowest positioning platform 51, one end of the screw 23 is screwed into the screw hole from top to bottom, and its end rests against the plate 4A4.

[0073] Step 5: Weld the positioned plates A1, A2, A3, and A4 to complete the fabrication of transition elbow A.

[0074] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A welding fixture for transition elbows, comprising a welding platform and a positioning assembly, wherein the positioning assembly is disposed on the welding platform, characterized in that: The positioning component includes a clamping device, a clamping device, a support block, and a positioning block. The positioning block is rectangular in shape. The top of the positioning block has three positioning platforms arranged in a stepped manner from high to low. The lowest positioning platform extends forward along the arrangement direction of the three positioning platforms to form a bottom-suspended protrusion. The two sides of the protrusion and the left and right sides of the lowest positioning platform form a recess. The support block is movably disposed on the welding platform in the extension direction of the protrusion; One end of the clamp is disposed on the welding platform, and the other end of the clamp is located above the lowest positioning platform; The two clamping ends of the clamp are located on either side of the lowest positioning platform.

2. The welding fixture for a transition elbow according to claim 1, characterized in that: The welding platform is provided with at least four through holes arranged in a matrix.

3. The welding fixture for a transition elbow according to claim 2, characterized in that: The bottom of the positioning block is provided with a positioning and fixing screw hole. The positioning and fixing bolt passes through the through hole and is screwed into the positioning and fixing screw hole to fix the positioning block.

4. The welding fixture for a transition elbow according to claim 3, characterized in that: The support block is provided with support fixing holes, and support fixing bolts pass through the support fixing holes and through holes to fix the support block.

5. The welding fixture for a transition elbow according to claim 4, characterized in that: The clamping device includes a vertical rod, a horizontal rod, a screw rod, and a handle. One end of the vertical rod is provided with a clamping and fixing screw hole. A clamping and fixing bolt passes through the through hole and is screwed into the clamping and fixing screw hole to fix the through hole on the welding platform. The other end of the vertical rod is provided with a sleeve. One end of the horizontal rod extends into the sleeve and is provided with a screw hole. One end of the screw rod is screwed into the screw hole and is located above the lowest positioning platform. The handle is provided at the other end of the screw rod, and the axis of the handle is perpendicular to the axis of the screw rod.

6. The welding fixture for a transition elbow according to claim 5, characterized in that: The clamp includes a U-shaped rod, a clamping arm, and a clamping rod. One end of the U-shaped rod extends forward, and one end of the clamping arm is fitted onto the extended end of the U-shaped rod. The clamping rod is screwed into a screw hole on the other end of the clamping arm, and the clamping rod end of the clamping arm and the other end of the U-shaped rod form the two clamping ends of the clamp.

7. A method for welding a transition elbow using the welding fixture described in claim 6, comprising the following steps: Step 1: The positioning block, support block, and clamping device are fixed on the welding platform; Step 2: Place plate 1 horizontally between the protrusion and the welding platform, with one end of plate 1 in contact with the bottom of the positioning block. Adjust the position of the support block on the welding platform so that the support block abuts against the other end of plate 1, positioning plate 1 within the space enclosed by the positioning block, protrusion, support block, and welding platform. Step 3: Plate 2 and Plate 3 are positioned on the left and right sides of the protrusion. The bottoms of Plate 2 and Plate 3 are placed on Plate 1. The left bottom of Plate 2 and Plate 3 abuts against the recess. The left top of Plate 2 and Plate 3 is placed on a positioning platform in the middle, and its ends abut against the vertical connecting surface between the highest positioning platform and the middle positioning platform. The two clamping ends of the clamping device clamp the bottoms of Plate 2 and Plate 3 respectively, positioning Plate 2 and Plate 3 on the positioning surface formed by Plate 1, the protrusion, the recess, the highest positioning platform, and the vertical connecting surface. Step 4: Plate 4 is placed on the lowest positioning platform, and the left and right sides of Plate 3 are in contact with Plate 2 and Plate 3. One end of Plate 4 rests on the vertical connecting surface between the middle positioning platform and the lowest positioning platform, and the other end of the clamping device rests on Plate 4, positioning Plate 4 within the space enclosed by the lowest positioning platform, Plate 2, Plate 3 and the vertical connecting surface. Step 5: Weld the positioned plates 1, 2, 3 and 4.

8. The method for welding a transition elbow according to claim 7, characterized in that: In step one, the process of fixing the positioning block, support block, and clamping device onto the welding platform is as follows: The positioning and fixing screw holes at the bottom of the positioning block correspond to the through holes. The positioning and fixing bolts pass through the through holes and are screwed into the positioning and fixing screw holes to achieve the connection between the positioning block and the welding platform. The support fixing holes on the support block correspond to the through holes, and the support fixing bolts pass through the through holes and support fixing holes to connect the support block to the welding platform. One end of the clamp is provided with a clamping and fixing screw hole, which corresponds to the through hole. The clamping and fixing bolt passes through the through hole and is screwed into the clamping and fixing screw hole to realize the connection between the clamp and the welding platform.

9. A method for welding a transition elbow according to claim 7, characterized in that: In step three, the process of clamping the two clamping ends of the clamping device with the bottom of plate two and plate three respectively is as follows: the two clamping ends of the clamping device are respectively located on both sides of plate two and plate three. The clamping arm slides on the extension end of the U-shaped rod so that the two clamping ends of the clamping device contact plate two and plate three respectively. The clamping rod is rotated, and under the action of the screw hole, the clamping rod end that passes through the clamping arm and the other end of the U-shaped rod clamp plate two and plate three.

10. A method for welding a transition elbow according to claim 7, characterized in that: In step four, the process of the other end of the clamping device abutting against plate four is as follows: rotate the upright rod so that the axis of the sleeve is above the lowest positioning platform, one end of the crossbar extends into the sleeve and the screw hole at the other end of the crossbar is above the lowest positioning platform, one end of the screw is screwed into the screw hole from top to bottom, and its end abuts against plate four.

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