Welding protection device for metal pipeline gas shield welding

Abstract

The utility model relates to a welding protection device for gas shield welding of a metal pipeline, which belongs to the field of welding auxiliary devices and comprises a first sealing element and a second sealing element which are used for sealing two ends in the metal pipeline on two sides of a welding seam and are connected through a gas inlet pipe and a connecting piece. The air inlet pipe penetrates through the first sealing piece, one end of the connecting piece is rotationally connected with the air inlet pipe, and the other end is fixedly connected with the second sealing piece. According to the welding protection device for gas shield welding of the metal pipeline, through cooperation of the first sealing piece, the second sealing piece, the gas inlet pipe, the connecting piece and the like, the effect that gas protection conditions are provided for a weld joint area in a targeted mode is achieved, the whole device can move in a straight pipe and at the position of an elbow, and the welding protection device is convenient to use. And gas protection conditions can be conveniently and sequentially provided for welding seams in different positions.

Description

Technical Field

[0001] This utility model belongs to the field of welding auxiliary devices, specifically relating to a welding protection device for gas shielded welding of metal pipelines. Background Technology

[0002] When welding metal pipes, it is often necessary to provide gas protection conditions; this is known as gas shielded welding (GSW). The basic operation of GSW involves attaching water-soluble paper to the inner wall of the pipe ends to be joined before the pipes are aligned. The gas pipe used to supply the shielding gas to the weld is then attached to the water-soluble paper. However, water-soluble paper is not suitable for pipe types where contact with water is not permitted during welding. The basic method for addressing this is to completely inflate the metal pipe with gas, which has drawbacks such as high gas consumption and high operating costs.

[0003] To reduce shielding gas consumption during gas-shielded welding, existing solutions involve first creating a sealing section within the pipe using a baffle, then filling it with gas, and finally removing the baffle with a rope after welding. This provides targeted gas protection for the weld area. While suitable for short pipes, this method suffers from drawbacks when used on long pipes, such as potential damage to the pipe wall during dragging and difficulties in dragging the baffle at bends. The stainless steel pipe welding protection device disclosed in CN208825858U uses a spring to connect and support two sealing devices. While this effectively improves the integrity of the two sealing devices and facilitates overall dragging, the spring is easily damaged under the high temperatures generated during welding. The spring's support is also unpredictable and unstable, causing the two sealing devices to tip over during movement within the pipe, resulting in poor sealing and gas leakage, thus weakening the gas protection effect. To address these issues, this invention proposes a welding protection device for gas-shielded welding of metal pipes. Utility Model Content

[0004] The purpose of this invention is to provide a welding protection device for gas shielded welding of metal pipelines in order to solve the above-mentioned problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] This utility model provides a welding protection device for gas shielded welding of metal pipes, including a first sealing element and a second sealing element for forming two-end sealing in the metal pipe on both sides of the weld. The first sealing element and the second sealing element are connected by an air inlet pipe and a connector. The air inlet pipe passes through the first sealing element, and one end of the connector is rotatably connected to the air inlet pipe, while the other end is fixedly connected to the second sealing element.

[0007] As a further optimization of this utility model, the connector includes a number of sequentially arranged links, and adjacent links are rotatably connected.

[0008] As a further optimization of this utility model, the first sealing element includes a movable sealing interlayer and clamps located on both sides of the movable sealing interlayer, and the structure of the second sealing element is the same as that of the first sealing element.

[0009] As a further optimization of this utility model, the diameter of the clamp is smaller than the inner diameter of the metal pipe, and the outer contour diameter of the movable sealing interlayer is larger than the inner diameter of the metal pipe.

[0010] As a further optimization of this utility model, the movable sealing interlayer is made of sponge.

[0011] As a further optimization of this utility model, the movable sealing interlayer is a cooling water bladder.

[0012] As a further optimization of this utility model, the first sealing element is provided with a guide wire.

[0013] As a further optimization of this utility model, the intake pipe has a number of evenly distributed air holes on a section of the pipe wall between the first sealing element and the second sealing element.

[0014] The beneficial effects of this utility model are as follows:

[0015] 1. The welding protection device for gas shielded welding of metal pipelines proposed in this utility model uses a first sealing element and a second sealing element to form a two-end seal inside the metal pipeline, so that the protective gas can accumulate around the weld and overflow from the weld, thereby achieving the effect of providing gas protection conditions during the welding process. An inlet pipe and a connector are used to establish a connection between the first sealing element and the second sealing element, so that the whole device can move inside the metal pipeline under the pull of the guide wire. The gas protection area provided by the device can be changed according to the position of the weld. The connector, which consists of several rotating connecting rods, can not only adapt to the bends to complete the turning, but also provide stable support for the first sealing element and the second sealing element, so that the whole device can move stably inside the metal pipeline.

[0016] 2. The first and second sealing elements adopted, through the cooperation of the clamping plate and the movable sealing interlayer, allow the movable sealing interlayer to adapt to the metal pipe within a limited range, thereby achieving a good sealing effect and facilitating movement within the metal pipe. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the present invention inside a straight pipe;

[0018] Figure 2 This is a cross-sectional view of the present invention inside the elbow;

[0019] Figure 3 This is a schematic diagram of the overall appearance of this utility model;

[0020] Figure 4 This is a schematic diagram showing the disassembly of the first sealing element.

[0021] In the figure: 1. First seal; 101. Clamping plate; 102. Movable sealing interlayer; 2. Second seal; 3. Inlet pipe; 4. Air hole; 5. Connector; 6. Guide wire; 7. Weld. Detailed Implementation

[0022] The present application will now be described in further detail. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0023] Example 1

[0024] like Figure 1-4 As shown, the welding protection device for gas shielded welding of metal pipes in this embodiment includes a first sealing element 1 and a second sealing element 2 for forming two-end sealing in the metal pipe on both sides of the weld. The first sealing element 1 and the second sealing element 2 are connected by an air inlet pipe 3 and a connector 5. The air inlet pipe 3 passes through the first sealing element 1. One end of the connector 5 is rotatably connected to the air inlet pipe 3, and the other end is fixedly connected to the second sealing element 2. The air inlet pipe 3 and the connector 5 are both made of stainless steel.

[0025] This metal pipe gas shielded welding protection device has no additional restrictions on the shielding gas used. When using this device, firstly, a shielding gas delivery hose needs to be connected to the inlet end of the gas inlet pipe 3. Then, the first sealing element 1 and the second sealing element 2 are placed in the two metal pipes to be welded, so that the weld seam 7 of the metal pipe is located between the first sealing element 1 and the second sealing element 2. The first sealing element 1 and the second sealing element 2 achieve a seal at both ends inside the metal pipe. After the shielding gas is introduced into the gas inlet pipe 3 using the shielding gas delivery hose, the shielding gas will enter between the first sealing element 1 and the second sealing element 2 along the gas inlet pipe 3. Subsequently, the gas can only overflow from the weld seam 7, thus providing gas protection conditions during the welding process. The connection of the connecting element 5 and the gas inlet pipe 3 forms an integral unit, making the device easier to move stably inside the metal pipe.

[0026] Preferably, the connector 5 includes a number of sequentially arranged connecting rods, and adjacent connecting rods are rotatably connected. When the whole device moves inside the metal pipe, the connector 5 and the air inlet pipe 3 can both turn the bend and provide stable support for the first seal 1 and the second seal 2 on both sides, preventing the first seal 1 and the second seal 2 from tipping over during the movement.

[0027] Preferably, the first sealing element 1 includes a movable sealing interlayer 102 and clamping plates 101 located on both sides of the movable sealing interlayer 102, and the structure of the second sealing element 2 is the same as that of the first sealing element 1, and the clamping plates 101 are made of stainless steel.

[0028] The diameter of the clamp 101 is smaller than the inner diameter of the metal pipe, and the outer contour diameter of the movable sealing interlayer 102 is larger than the inner diameter of the metal pipe. The difference between the inner diameter of the clamp 101 and the inner diameter of the metal pipe is about 20mm.

[0029] The movable sealing interlayer 102 is made of a deformable flexible material. After entering the metal pipe, it will automatically deform to fit completely against the inner wall of the metal pipe, thereby achieving a sealing effect. The two clamps 101 can prevent the movable sealing interlayer 102 from undergoing excessive and irregular deformation, which is conducive to achieving a better and more stable sealing effect, and also makes it easier for the first sealing element 1 and the second sealing element 2 to move inside the metal pipe.

[0030] Preferably, the movable sealing interlayer 102 is made of sponge. The sponge is a high-density and high-temperature resistant sponge with a high degree of freedom of deformation, which achieves a good sealing effect. Furthermore, a layer of high-temperature resistant paper tape can be wrapped around the outside of the sponge to avoid the problem of debris generated by sponge wear contaminating the inner wall of the metal pipe.

[0031] Preferably, the movable sealing interlayer 102 is a cooling water bladder, and the bladder is made of high-temperature resistant rubber. It contains coolant, and the cooling water bladder can not only achieve the sealing effect, but also accelerate the cooling of the weld 7.

[0032] Preferably, the first sealing element 1 is provided with a guide wire 6, which is made of stainless steel. After a weld 7 is completed, the entire device can be moved in the metal pipe to the next weld 7 simply by pulling the guide wire 6, making the operation convenient and efficient.

[0033] Preferably, the intake pipe 3 has a number of evenly distributed air holes 4 on a section of the pipe wall between the first seal 1 and the second seal 2. The diameter of the air holes 4 is about 2 mm. The air holes 4 have a pressure relief effect and can reduce the protective pressure of the protective gas.

[0034] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A welding protection device for gas-shielded welding of metal pipes, comprising a first sealing element (1) and a second sealing element (2) for forming end-to-end sealing within the metal pipe on both sides of the weld, characterized in that, The first seal (1) and the second seal (2) are connected by an air inlet pipe (3) and a connector (5). The air inlet pipe (3) passes through the first seal (1). One end of the connector (5) is rotatably connected to the air inlet pipe (3), and the other end is fixedly connected to the second seal (2).

2. The welding protection device for gas-shielded welding of metal pipelines according to claim 1, characterized in that, The connector (5) includes a plurality of sequentially arranged links, and adjacent links are rotatably connected.

3. The welding protection device for gas-shielded welding of metal pipelines according to claim 2, characterized in that, The first sealing element (1) includes a movable sealing interlayer (102) and clamps (101) located on both sides of the movable sealing interlayer (102), and the structure of the second sealing element (2) is the same as that of the first sealing element (1).

4. A welding protection device for gas-shielded welding of metal pipelines according to claim 3, characterized in that, The diameter of the clamp (101) is smaller than the inner diameter of the metal pipe, and the outer diameter of the movable sealing interlayer (102) is larger than the inner diameter of the metal pipe.

5. A welding protection device for gas-shielded welding of metal pipelines according to claim 4, characterized in that, The active sealing interlayer (102) is a sponge.

6. A welding protection device for gas-shielded welding of metal pipelines according to claim 4, characterized in that, The active sealing interlayer (102) is a cooling water bladder.

7. A welding protection device for gas-shielded welding of metal pipelines according to claim 1, characterized in that, The first seal (1) is provided with a guide wire (6).

8. A welding protection device for gas-shielded welding of metal pipelines according to claim 1, characterized in that, The intake pipe (3) has a number of evenly distributed air holes (4) on a section of the pipe wall between the first seal (1) and the second seal (2).

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