A girth weld internal preheating tool

Abstract

The utility model relates to the field of welding auxiliary frock field discloses a girth weld internal preheating frock, including the external pipe and internal pipe in the rudder sleeve, the internal pipe is fixed in the external pipe through bolt, and the end of external pipe and internal pipe is equipped with flat steel, and the position of flat steel placement is opposite position of external pipe and internal pipe, and flat steel abuts on the heating sheet. Through the heating workpiece directly to the heating plate support and press, and the heating plate forms the annular, can heat simultaneously to the girth weld.

Description

Technical Field

[0001] This utility model relates to the field of welding auxiliary tooling technology, specifically a preheating tooling for the inside of a circumferential weld. Background Technology

[0002] Before welding thick-walled materials such as cylinders, annular pipes, and connecting pipes, it is often necessary to preheat the weld joints to prevent cracks or other defects from forming during welding.

[0003] Previously, the heating element could not be fixedly supported at the top of the weld seam because the preheated workpiece was not positioned correctly. Therefore, the cylinder needed to be rotated so that the top of the weld seam that had not been preheated was rotated to the bottom. In this way, the heating element would fall directly to the bottom of the weld seam due to gravity and be heated. However, this method resulted in a time difference in the preheating of the weld seam and a temperature difference around the weld seam, leading to uneven heating and making it easy to produce weld cracks during welding.

[0004] Document CN 212823526 U discloses a preheating fixture for welding circumferential welds on annular workpieces. It includes a concave, arc-shaped base plate with symmetrically mounted side support plates at both ends. A convex, arc-shaped main gas pipe is mounted on the top of both side support plates. Multiple burners are evenly distributed along the arc direction on the outer surface of the main gas pipe. The burners are connected to an external air intake pipe via the main gas pipe. This preheating fixture is placed inside the annular workpiece to be welded, with the bottom of the annular workpiece supported on a rotating frame. While this method can preheat the annular workpiece, when the workpiece rotates to be heated, a temperature difference exists between the already heated area and the area currently being heated, leading to uneven heating and making it prone to weld cracks during welding.

[0005] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content

[0006] To address the aforementioned issues, this utility model discloses an internal preheating fixture for circumferential welds. The heating plate is directly supported and pressed by the heated workpiece, forming a ring shape, which can simultaneously heat the circumferential weld.

[0007] The technical solution of this utility model is as follows: a preheating fixture for the inner part of a circumferential weld, including an outer tube and an inner tube located inside the rudder sleeve. The inner tube is fixed inside the outer tube by bolts. Flat steel is provided at the ends of the outer tube and the inner tube. The flat steel is placed at the opposite position of the outer tube and the inner tube, and the flat steel abuts against the heating plate.

[0008] By adopting the above technical solution, the flat steel on the inner and outer tubes can be pressed against the heating plate to achieve the preheating effect on the circumferential weld on the rudder sleeve. The circumferential weld can be heated directly through the tooling formed by the outer and inner tubes. This allows the heating plate to form a closed-loop heating of the circumferential weld, ensuring uniform heating and preventing uneven heating before welding, which could lead to welding cracks.

[0009] Preferably, the outer tube and the inner tube are square tubes, with the outer tube being larger than the inner tube, and the outer tube having a through hole for bolts to pass through.

[0010] By adopting the above technical solution, since the outer tube and the inner tube are square tubes with right angles, the rotation of the inner tube inside the outer tube can be effectively prevented when the inner tube is inserted into the outer tube.

[0011] Preferably, the through hole is located close to the side of the outer tube where there is no flat steel, and the through hole is located in the middle of the short lateral side of the square tube.

[0012] By adopting the above technical solution, since the inner tube is inserted into the outer tube from the side without the flat steel, and the insertion length of the inner tube on the side without the flat steel is longer than that on the side with the flat steel, the through hole for fixing the inner tube is located close to the side of the outer tube without the flat steel, which can fix the inner tube in a timely, fast and more stable manner.

[0013] Preferably, the inner tube is inserted into the outer tube, the through hole on the outer tube is located on one side of the inner tube, the bolt is a wing bolt, and when the wing bolt is tightened, the end abuts against the inner tube.

[0014] By adopting the above technical solution, when the inner tube is inserted into the outer tube, the end of the bolt can abut against the inner tube, which can fix the inner tube to the outer tube. Furthermore, the length of the inner tube inserted into the outer tube can be changed according to the diameter of the rudder sleeve to adapt to the diameter of the rudder sleeve.

[0015] Preferably, the heating element is arc-shaped and adapted to the rudder sleeve.

[0016] By adopting the above technical solution, the heating element is a slightly flexible ceramic heating element. When heating the circumferential weld of the rudder sleeve, the arc shape of the heating element can be adapted to the inner wall of the rudder sleeve, and the heating element can completely fit the rudder sleeve, making the heating of the circumferential weld of the rudder sleeve more uniform.

[0017] Preferably, the heating elements are attached to the inner wall of the rudder sleeve weld and connected end to end to form a closed-loop heating system.

[0018] By adopting the above technical solution, the heating elements are spliced ​​together to form a closed loop on the circumferential weld of the rudder sleeve. This allows for sufficient preheating of the circumferential weld and ensures uniform heating, preventing cracks and other defects during welding.

[0019] Preferably, the flat steels at both ends of the tooling formed by connecting the inner and outer tubes abut against different heating elements.

[0020] By adopting the above technical solution, the flat steels at both ends of the heating fixture, namely the flat steels of the inner tube and the outer tube, respectively abut and fix the heating element, thereby keeping the heating element on the circumferential weld.

[0021] The advantages of this utility model are as follows: 1. By abutting the preheating fixture against the heating plate, this utility model can prevent the heating plate from shifting. The preheating fixture supports the heating plate at the top of the circumferential weld. The heating plate at the top of the circumferential weld can also be directly supported by the preheating fixture to prevent it from falling.

[0022] 2. This utility model, by inserting the inner tube into the outer tube, allows for adjustment of the overlap length between the inner and outer tubes according to the diameter of the rudder sleeve, thereby accommodating the heating element inside the rudder sleeve, providing pressure and support for the heating element, preventing displacement, and the adjustment between the inner and outer tubes is very simple and convenient.

[0023] 3. This utility model can directly press and support the heating element through several preheating fixtures. The heating element is located inside the circumferential weld to form a closed loop. Then, the preheating fixtures directly press and support them simultaneously, that is, the circumference of the circumferential weld is heated at the same time. This heating method can heat the circumferential weld evenly and prevent welding cracks caused by uneven preheating during welding. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the preheating fixture of this utility model for preheating circumferential welds.

[0025] Figure 2 This is a schematic diagram of the preheating fixture of this utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the external tube of this utility model;

[0027] Figure 4 This is a schematic diagram of the internal tube structure of this utility model.

[0028] The components are: 1. outer tube, 1-1. through hole, 2. inner tube, 3. flat steel, 4. bolt, 5. rudder sleeve, 5-1. circumferential weld, 6. heating element. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0030] like Figure 1 As shown, a preheating fixture for an internal circumferential weld includes an outer tube 1 and an inner tube 2 located inside the rudder sleeve 5. The inner tube 2 is fixed inside the outer tube 1 by bolts 4. Flat steel 3 is provided at the ends of the outer tube 1 and the inner tube 2. The flat steel 3 is larger than the cross-section of the outer tube 1 and the inner tube 2. The flat steel 3 is a straight plate type. The contact surface of the flat steel 3 can just abut against the heating element 6. The flat steel 3 is placed in the opposite position of the outer tube 1 and the inner tube 2. The flat steel 3 abuts against the heating element 6. By abutting the flat steel 3 on the inner tube 2 and the outer tube 1 against the heating element 6, the preheating effect of the circumferential weld 5-1 on the rudder sleeve 5 can be achieved. The fixture formed by the outer tube 1 and the inner tube 2 can directly achieve the heating of the circumferential weld 5-1. It can make the heating element 6 form a closed loop heating of the circumferential weld 5-1, and the heating is uniform, preventing the problem of uneven heating before welding and the occurrence of welding cracks.

[0031] like Figure 2 As shown, the outer tube 1 and the inner tube 2 are square tubes. The outer tube 1 is larger than the inner tube 2. The outer tube 2 is provided with a through hole 1-1 for the bolt 4 to pass through. Since the outer tube 1 and the inner tube are square tubes with right angles, when the inner tube 2 is inserted into the outer tube, it can effectively prevent the inner tube 2 from rotating inside the outer tube 1.

[0032] like Figure 3-4 As shown, the through hole 1-1 is located near the side of the outer tube 1 without the flat steel 3. The through hole 1-1 is located in the middle of the short side of the square tube. The through hole 1-1 is generally located in the middle of the side wall of the square tube, which makes it convenient for the bolt 4 to fix the inner tube 2. This is because the inner tube 2 is inserted from the side of the outer tube 1 without the flat steel 3, and the insertion length of the inner tube on the side without the flat steel 3 is longer than that on the side with the flat steel 3. Therefore, the through hole 1-1 used to fix the inner tube is located near the side of the outer tube 1 without the flat steel 3, which can fix the inner tube 2 in a timely, quick and more stable manner.

[0033] The inner tube 2 is inserted into the outer tube 1. The through hole 1-1 on the outer tube 1 is located on one side of the inner tube 2, which can be used to tighten the inner tube 2. The bolt 4 can be a wing bolt. When the wing bolt is tightened, the end abuts against the inner tube 2. The depth of the inner tube 2 inserted into the outer tube 1 can be adjusted as needed. When the inner tube 2 is inserted into the outer tube 1, the end of the bolt 4 can abut against the inner tube 2, which can fix the inner tube 2 to the outer tube 1. The length of the inner tube 2 inserted into the outer tube 1 can be changed according to the diameter of the rudder sleeve 5 to adapt to the diameter of the rudder sleeve 5.

[0034] The heating element 6 is an arc shape adapted to the rudder sleeve 5. The heating element 6 is a slightly flexible ceramic heating element (this heating element is the heating element commonly used by those skilled in the art). When heating the circumferential weld 5-1 of the rudder sleeve 5, the arc shape of the heating element 6 can adapt to the inner wall of the rudder sleeve 5. The heating element 6 can completely fit the rudder sleeve 5, making the heating of the circumferential weld 5-1 of the rudder sleeve 5 more uniform. The heating elements 6 are closely attached to the inner wall of the weld bead of the rudder sleeve 5 and connected end to end to form a closed-loop heating. The heating elements 6 are spliced ​​together to form a closed loop on the circumferential weld 5-1 of the rudder sleeve 5. This can fully preheat the circumferential weld 5-1 and ensure uniform heating, preventing cracks and other phenomena during welding.

[0035] The flat steel 3 at both ends of the tooling formed by the connection of the inner tube 2 and the outer tube 1 abuts against different heating plates 6. The flat steel 3 at both ends of the heating tooling, namely the flat steel 3 of the inner tube 2 and the outer tube 1, abuts against and fixes the heating plates 6. Since the heating plates 6 are supported by the tooling, namely the inner tube 2 and the outer tube 1, the heating plates 6 have a force toward the circumferential weld 5-1, thereby keeping the heating plates 6 on the circumferential weld 5-1.

[0036] Working principle: Before welding the circumferential weld 5-1 of the rudder sleeve 5, the circumferential weld 5-1 needs to be preheated. The heating element 6 is placed tightly against the circumferential weld 5-1. Then, the flat steel 3 at the end of the outer tube 1 is first placed tightly against the heating element 6. Then, the depth of the inner tube 2 located inside the outer tube 1 is adjusted. When the inner tube 2 can also abut against the heating element 6, the bolt 4 is passed through the through hole 1-1 of the outer tube 1 to abut against the inner tube 2. This allows the preheating fixture to support the heating element 6 located above the circumferential weld 5-1 and to press down the heating element 6 located below the circumferential weld 5-1. After the workpiece has pressed and supported the heating element 6, the heating element 6 is energized to preheat the circumferential weld 5-1.

[0037] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A preheating fixture for an internal circumferential weld, comprising an outer tube and an inner tube located within a rudder sleeve, characterized in that: The inner tube is fixed inside the outer tube by bolts. The ends of the outer tube and the inner tube are provided with flat steel. The flat steel is placed in the opposite position of the outer tube and the inner tube, and the flat steel abuts against the heating element.

2. The preheating fixture for the inner surface of a circumferential weld according to claim 1, characterized in that: The outer tube and the inner tube are square tubes, with the outer tube being larger than the inner tube, and the outer tube having a through hole for bolts to pass through.

3. The preheating fixture for the inner surface of a circumferential weld according to claim 2, characterized in that: The through hole is located near the side of the outer tube without the flat steel, and the through hole is located in the middle of the short lateral side of the square tube.

4. The preheating fixture for the inner surface of a circumferential weld according to claim 1, characterized in that: The inner tube is inserted into the outer tube, and the through hole on the outer tube is located on one side of the inner tube. The bolt is a wing bolt, and when the wing bolt is tightened, its end abuts against the inner tube.

5. The preheating fixture for the inner surface of a circumferential weld according to claim 1, characterized in that: The heating element is arc-shaped and adapted to the rudder sleeve.

6. The preheating fixture for the inner surface of a circumferential weld according to claim 1, characterized in that: The heating elements are attached to the inner wall of the rudder sleeve weld, connected end to end to form a closed-loop heating system.

7. The preheating fixture for the inner surface of a circumferential weld according to claim 1, characterized in that: The flat steels at both ends of the tooling formed by the connection of the inner and outer tubes abut against different heating elements.

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