Pipe welding internal gas protection tooling

Abstract

The utility model relates to pipeline welding technical field discloses a pipeline welding internal gas protection frock, including the air pipe, fills in the protective gas in the air pipe, is provided with at least two axial interval distribution's baffle on the air pipe, two baffle are located in the both sides of pipeline in the area to be welded, and the edge of baffle is sealed contact with the inner wall of pipeline, makes the sealed cavity between two baffle, the part of air pipe between two baffle is provided with a plurality of gas outlet holes, and the protective gas fills the sealed cavity through the gas outlet hole, provides protection for the area to be welded. The above-mentioned pipeline welding internal gas protection frock designs the narrow sealed cavity to the area to be welded, no matter how long size's pipeline, can realize local, effective gas protection, need not fill in the protective gas to the whole pipeline inside, remarkablely saves the protective gas amount, guarantees the protection effect.

Description

Technical Field

[0001] This utility model relates to the field of pipeline welding technology, and in particular to a tooling for internal gas protection during pipeline welding. Background Technology

[0002] Welding of stainless steel pipes is very common in the manufacturing of stainless steel equipment. The quality of the welded internal structure of many stainless steel pipes is determined based on the operating conditions, and defects such as oxidation, weld beads, and porosity must be avoided. Furthermore, the weld seams must be inspected. Therefore, before welding, stainless steel pipes must be filled with gases such as argon to isolate them from air and provide protection. However, while this method is effective for short pipes, for long pipes, filling with argon wastes a large amount of gas and the protective effect is poor, making them prone to defects such as oxidation during welding. Therefore, technical improvements are needed. Utility Model Content

[0003] Based on the above, the purpose of this utility model is to provide a gas protection tool for pipe welding, which is especially suitable for long pipes, to ensure that the internal welding area is fully protected during pipe welding and to avoid defects such as oxidation.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A gas shielding fixture for pipe welding includes a vent pipe inserted into the pipe, which is filled with a protective gas. The vent pipe has at least two axially spaced baffles located on both sides of the area to be welded inside the pipe, with the edges of the baffles in sealed contact with the inner wall of the pipe, forming a sealed cavity between the two baffles. The portion of the vent pipe between the two baffles has several vent holes, through which the protective gas fills the sealed cavity, providing protection for the area to be welded.

[0006] As an alternative, the partition includes a silicone rubber sheet and two fixing discs. The two fixing discs clamp the silicone rubber sheet and lock it with bolts. The diameter of the fixing discs is smaller than the inner diameter of the pipe, and the diameter of the silicone rubber sheet is not smaller than the inner diameter of the pipe. The fixing discs are sleeved on the vent pipe and sealed and fixed to the vent pipe.

[0007] As an optional option, both the mounting plate and the vent pipe are made of stainless steel.

[0008] As an optional option, both the silicone rubber sheet and the fixing plate are 4mm thick.

[0009] As an alternative, the vent tube is composed of several tube segments, each of which has an internal thread at one end and an external thread at the other end that is compatible with the internal thread.

[0010] As an alternative, pull rings are provided on the partitions and / or pipe sections, and pull ropes are attached to the pull rings.

[0011] As an alternative, a pulley system is provided on the vent pipe and located outside the sealed cavity. The pulley system includes at least three circumferentially distributed pulleys, each of which makes rolling contact with the inner wall of the pipe, so that the vent pipe is centered in the pipe and can move axially stably.

[0012] As an alternative, argon is used as the protective gas.

[0013] The beneficial effects of this utility model are:

[0014] This pipe welding internal gas protection fixture is designed with a narrow sealed cavity for the area to be welded. Regardless of the length of the pipe, it can achieve local and effective gas protection without filling the entire pipe with protective gas, significantly saving the amount of protective gas used and ensuring the protection effect. In particular, the sealed cavity filled with protective gas can effectively isolate the outside air, prevent oxygen, water vapor and other substances from entering the area to be welded, avoid defects such as weld oxidation, porosity and slag inclusion, and improve the welding quality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the internal gas protection fixture for pipe welding provided in this embodiment of the utility model.

[0016] In the attached image:

[0017] 1. Vent pipe; 11. Air outlet; 12. External thread; 2. Partition plate; 21. Silicone rubber sheet; 22. Fixing plate; 23. Bolt; 3. Sealing cavity; 4. Pulley block. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0019] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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 communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first" and "second" are merely used to distinguish between different terms in description and do not have any special meaning.

[0023] Please see Figure 1 As shown, this embodiment provides a gas protection fixture for pipe welding, including a vent pipe 1 inserted into the pipe, the vent pipe 1 being filled with protective gas, and at least two axially spaced baffles 2 provided on the vent pipe 1. The two baffles 2 are located on both sides of the area to be welded inside the pipe, and the edges of the baffles 2 are in sealed contact with the inner wall of the pipe, so that a sealed cavity 3 is formed between the two baffles 2. A plurality of vent holes 11 are provided at the part of the vent pipe 1 located between the two baffles 2, and the protective gas fills the sealed cavity 3 through the vent holes 11 to provide protection for the area to be welded.

[0024] Therefore, a narrow sealing cavity 3 is designed for the area to be welded, which can achieve local and effective gas protection regardless of the length of the pipe. There is no need to fill the entire pipe with protective gas, which significantly saves the amount of protective gas used and ensures the protection effect. In particular, the sealing cavity 3 filled with protective gas can effectively isolate the outside air and prevent oxygen, water vapor and other substances from entering the area to be welded, avoiding defects such as weld oxidation, porosity and slag inclusion, and improving the welding quality.

[0025] Optionally, the partition 2 includes a silicone rubber sheet 21 and two fixing discs 22. The two fixing discs 22 clamp the silicone rubber sheet 21 and lock it with bolts 23. The diameter of the fixing discs 22 is smaller than the inner diameter of the pipe, and the diameter of the silicone rubber sheet 21 is not smaller than the inner diameter of the pipe. The fixing discs 22 are sleeved on the vent pipe 1 and sealed and fixed to the vent pipe 1.

[0026] Among them, the silicone rubber sheet 21 usually has good flexibility, elasticity and high temperature resistance. Under the clamping action of the two fixed discs 22, it can better fill and fit the inner wall of the pipe, forming an effective seal and preventing the leakage of protective gas in the sealing cavity 3.

[0027] Furthermore, both the fixed plate 22 and the vent pipe 1 are made of stainless steel, and both the silicone rubber sheet 21 and the fixed plate 22 are 4mm thick.

[0028] The stainless steel fixing plate 22 provides stable support and clamping force, and its high strength and corrosion resistance ensure that the partition plate 2 is durable in the welding environment. Welding the fixing plate 22 to the vent pipe 1 to form a whole ensures the structural stability and durability of the gas protection tooling inside the entire pipeline welding.

[0029] Optionally, the vent pipe 1 is composed of several pipe segments, each pipe segment having an internal thread at one end and an external thread 12 that is compatible with the internal thread at the other end.

[0030] Considering that some pipelines are very long, by connecting multiple pipe sections end to end, it is convenient to insert the internal gas protection tool into the pipeline for welding, thereby allowing the sealing cavity 3 to be accurately pushed to the welding position, thus improving applicability.

[0031] Optionally, pull rings are provided on the partition 2 and / or the pipe section, and pull ropes are attached to the pull rings.

[0032] When the internal gas protection device for the pipeline is inserted into the pipeline, the pull ring and the pull rope enter the pipeline together. When the internal gas protection device for the pipeline is removed, the airtightness of the sealing cavity 3 may cause the vent pipe 1 to be segmented or difficult to remove. In this case, the internal gas protection device for the pipeline can be pulled out with the help of the pull rope.

[0033] Optionally, a pulley assembly 4 is provided on the vent pipe 1 and located outside the sealing cavity 3. The pulley assembly 4 includes at least three circumferentially distributed pulleys, each of which rolls in contact with the inner wall of the pipe, so that the vent pipe 1 is centered in the pipe and can move axially stably.

[0034] Among them, pulley block 4 plays a role in balancing and reducing resistance when the gas protection tool inside the pipe is welded into and out of the pipe.

[0035] Optionally, the protective gas is argon. Argon is very stable, non-flammable and does not support combustion, thus effectively isolating air and preventing oxidation reactions.

[0036] In summary, the internal gas protection tooling for pipeline welding is designed with a vent pipe 1 with a baffle 2 to accommodate pipelines of different sizes. It can form a high-purity protective environment in the area to be welded with extremely low gas consumption, effectively preventing defects such as weld oxidation and significantly improving welding quality and consistency. In addition, the pulley block 4 and pull rope enable precise positioning and convenient loading and unloading, greatly improving the efficiency and reliability of long pipeline welding operations, and is especially suitable for on-site pipeline construction.

[0037] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pipe welding internal gas shielded tooling characterized by, The system includes a vent pipe (1) inserted into a pipeline, which is filled with protective gas. The vent pipe (1) is provided with at least two axially spaced baffles (2), which are located on both sides of the area to be welded inside the pipeline. The edges of the baffles (2) are in sealed contact with the inner wall of the pipeline, forming a sealed cavity (3) between the two baffles (2). The vent pipe (1) located between the two baffles (2) is provided with several air outlets (11), and the protective gas fills the sealed cavity (3) through the air outlets (11) to provide protection for the area to be welded. A pulley assembly (4) is provided on the vent pipe (1) and located outside the sealing cavity (3). The pulley assembly (4) includes at least three circumferentially distributed pulleys. Each pulley makes rolling contact with the inner wall of the pipe, so that the vent pipe (1) is centered in the pipe and can move axially stably.

2. The pipe welding internal gas shield tooling of claim 1, wherein, The partition (2) includes a silicone rubber sheet (21) and two fixing discs (22). The two fixing discs (22) clamp the silicone rubber sheet (21) and lock it with bolts (23). The diameter of the fixing discs (22) is smaller than the inner diameter of the pipe, and the diameter of the silicone rubber sheet (21) is not smaller than the inner diameter of the pipe. The fixing discs (22) are sleeved on the vent pipe (1) and sealed and fixed to the vent pipe (1).

3. The pipe welding internal gas shield tooling of claim 2, wherein, Both the fixed plate (22) and the vent pipe (1) are made of stainless steel.

4. The pipe welding internal gas shield tooling of claim 3, wherein, The thickness of both the silicone rubber sheet (21) and the fixing plate (22) is 4 mm.

5. The internal gas protection fixture for pipeline welding according to claim 1, characterized in that, The ventilation tube (1) is composed of several tube segments. Each tube segment has an internal thread at one end and an external thread (12) that is compatible with the internal thread at the other end.

6. The pipe welding internal gas shield tooling of claim 5, wherein, Pull rings are provided on the partition (2) and / or the pipe section, and pull ropes are attached to the pull rings.

7. The pipe welding internal gas shield tooling of claim 1, wherein, The protective gas is argon.

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