Stainless steel pipe butt weld back gas protection device

Abstract

The utility model discloses a stainless steel pipe butt weld back gas protection device which comprises a stainless steel clamping plate, a sealing rubber sheet arranged at the bottom of the stainless steel clamping plate, a stainless steel reinforcing plate arranged on the stainless steel clamping plate, a hanging ring arranged on the stainless steel reinforcing plate, a fastener combination arranged on the outer side of the stainless steel reinforcing plate, and inflation holes formed in the two sides of the fastener combination. A back gas protection area is arranged on the back of the sealing rubber sheet, a to-be-welded area is arranged in the center of the back gas protection area, a steel wire rope is connected to the hanging ring, and an inflation pipe is arranged on the inflation hole. The stainless steel pipe butt weld back gas protection device is connected through the fastener, the stainless steel clamping plate and the sealing rubber sheet can be replaced according to actual working conditions, and the stainless steel pipe butt weld back gas protection device can adapt to pipe diameter changes within a certain range. Therefore, the device can be used for welding a stainless steel pipe butt welding seam, such as a carbon steel welding pipe needing back gas protection, a pressure container and a stainless steel pipe and a flange or an end socket, is simple and convenient to operate and can be operated by one hand, and manpower is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding, and in particular relates to a gas protection device for the back of a butt weld of a stainless steel pipe. Background Art

[0002] When welding materials such as magnesium and titanium that are particularly sensitive to oxidation and nitridation, or welding materials such as stainless steel that have poor heat dissipation conditions and long high-temperature residence time of the weld, the weld surface is often oxidized or nitrided, which reduces the weld performance. Generally, when welding stainless steel pipes or containers, argon or nitrogen is filled inside to prevent the back weld from invading the air, protect the weld pool, and protect the back of the weld. However, the existing stainless steel pipe butt weld back gas protection device can be further improved in terms of its welding technology, so we need a new type of stainless steel pipe butt weld back gas protection device to solve the above problems and meet people's needs. Utility Model Content

[0003] The utility model aims to provide a gas protection device for the back of a stainless steel pipe butt weld to solve the problem of welding technology.

[0004] To achieve the above purpose, the utility model provides the following technical solutions: a stainless steel pipe butt weld back gas protection device, comprising

[0005] A stainless steel splint, wherein a sealing rubber sheet is provided at the bottom of the stainless steel splint, a stainless steel reinforcing plate is provided on the stainless steel splint, a hanging ring is provided on the stainless steel reinforcing plate, a fastener assembly is provided on the outer side of the stainless steel reinforcing plate, inflation holes are provided on both sides of the fastener assembly, a back gas protection zone is provided on the back of the sealing rubber sheet, a welding zone is provided in the center of the back gas protection zone, a steel wire rope is connected to the hanging ring, and an inflation tube is provided on the inflation hole.

[0006] Preferably, the stainless steel clamping plate and the sealing rubber sheet are fixed by fasteners.

[0007] Preferably, a stainless steel reinforcing plate and a hanging ring are welded to the stainless steel clamping plate.

[0008] Preferably, the inflation hole is a drilled hole on the bolt.

[0009] Preferably, the back gas protection zone is fixed in the stainless steel pipe by traction with a steel wire rope.

[0010] Preferably, the sealing rubber sheet is in close contact with the stainless steel pipe wall.

[0011] The technical effects and advantages of the utility model are as follows: the back gas protection device for the butt weld of stainless steel pipe is connected by fasteners, wherein the stainless steel clamping plate and the sealing rubber sheet can be replaced according to the actual working conditions, and can adapt to a certain range of pipe diameter changes. This device can be used not only in the butt weld of stainless steel pipes, but also in the carbon steel welded pipes, pressure vessel welding, stainless steel pipe and flange or head welding that require back gas protection. The device is easy to operate and can be operated with one hand, saving manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is a structural schematic diagram of the reinforcement structure in the utility model.

[0014] In the figure: 1-stainless steel splint, 2-sealing rubber sheet, 3-lifting ring, 4-fastener assembly, 5-stainless steel reinforcement plate, 6-inflating hole, 7-back gas protection area, 8-steel wire rope, 9-inflating tube, 10-area to be welded. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] The utility model provides Figure 1 , Figure 2 A stainless steel pipe butt weld back gas protection device is shown, comprising

[0017] A stainless steel splint 1, a sealing rubber sheet 2 is provided at the bottom of the stainless steel splint 1, a stainless steel reinforcing plate 5 is provided on the stainless steel splint 1, a lifting ring 3 is provided on the stainless steel reinforcing plate 5, a fastener assembly 4 is provided on the outer side of the stainless steel reinforcing plate 5, and inflation holes 6 are provided on both sides of the fastener assembly 4, a back gas protection zone 7 is provided on the back of the sealing rubber sheet 2, a welding zone 10 is provided in the center of the back gas protection zone 7, a steel wire rope 8 is connected to the lifting ring 3, and an inflation tube 9 is provided on the inflation hole 6.

[0018] Specifically, the stainless steel clamping plate 1 and the sealing rubber sheet 2 are fixed by fasteners.

[0019] Specifically, a stainless steel reinforcing plate 5 and a lifting ring 3 are welded to the stainless steel clamping plate 1 .

[0020] Specifically, the inflation hole 6 is a drilled hole on the bolt.

[0021] Specifically, the back gas protection zone 7 is pulled and fixed in the stainless steel pipe by a steel wire rope 8 .

[0022] Specifically, the sealing rubber sheet 2 is in close contact with the stainless steel pipe wall.

[0023] Working principle: During the use of the back gas protection device for the butt weld of the stainless steel pipe, prepare the steel wire rope 8 and the gas tube 9, and bundle the steel wire rope 8 and the gas tube 9 together. Insert the steel wire rope 8 and the gas tube 9 into the stainless steel pipe in advance, and pass the head out of the other end of the stainless steel pipe. Prepare the back gas protection device, fix the steel wire rope 8 that passes through the head to the lifting ring 3, connect the gas tube 9 that passes through the head to the gas hole 6, and check the air tightness. After the back gas protection device is connected. Pull the back gas protection device into the stainless steel pipe by pulling the steel wire rope 8 at the other end of the stainless steel pipe. Generally, the pulling distance is 150 to 200 mm on the weld side. Check whether the sealing rubber sheet 2 covers the inner wall of the stainless steel pipe to ensure good air tightness. The other butt welded stainless steel pipe is also installed according to the above steps. Note that the back gas protection device at the other end does not need to be connected to the gas hole. During normal operation, the device is pulled into the pipe to be welded, and the position is adjusted so that the sealing rubber sheet 2 is close to the pipe wall. The gas is connected to the inlet at the end of the screw, and the pipe is inflated from the hole in the middle of the screw to achieve back gas protection. The upper and lower stainless steel splints 1 fix a sealing rubber sheet 2 through fasteners. A stainless steel reinforcing plate 5 and a lifting ring 3 are welded on one of the stainless steel splints 1. Holes are drilled on two of the bolts as inflation holes. The diameter of the stainless steel splint 1 needs to be slightly smaller than the inner diameter of the stainless steel pipe to be welded, and the sealing rubber sheet needs to be 3 to 5 mm larger than the inner diameter of the stainless steel pipe to be welded. Ensure interference fit during installation to ensure air tightness. Connected by fasteners, the stainless steel splint 1 and the sealing rubber sheet 2 can be replaced according to actual working conditions. It can adapt to a certain range of pipe diameter changes. This device can be used not only in stainless steel pipe butt welds, but also in carbon steel welded pipes, pressure vessel welding, stainless steel pipes and flanges or head welding that require back gas protection. It is easy to operate. In the case of insufficient manpower, a single person can complete the welding and back protective gas filling work.

[0024] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas protection device for the back of a stainless steel pipe butt weld, characterized in that: include A stainless steel splint (1), wherein a sealing rubber sheet (2) is provided at the bottom of the stainless steel splint (1), a stainless steel reinforcing plate (5) is provided on the stainless steel splint (1), a lifting ring (3) is provided on the stainless steel reinforcing plate (5), a fastener assembly (4) is provided on the outer side of the stainless steel reinforcing plate (5), inflation holes (6) are provided on both sides of the fastener assembly (4), a back gas protection zone (7) is provided on the back of the sealing rubber sheet (2), a welding zone (10) is provided in the center of the back gas protection zone (7), a steel wire rope (8) is connected to the lifting ring (3), and an inflation tube (9) is provided on the inflation hole (6).

2. A stainless steel pipe butt weld back gas protection device according to claim 1, characterized in that: The stainless steel clamping plate (1) and the sealing rubber sheet (2) are fixed by fasteners.

3. A stainless steel pipe butt weld back gas protection device according to claim 1, characterized in that: A stainless steel reinforcing plate (5) and a hanging ring (3) are welded to the stainless steel clamping plate (1).

4. A stainless steel pipe butt weld back gas protection device according to claim 1, characterized in that: The inflation hole (6) is a drilled hole on the bolt.

5. A stainless steel pipe butt weld back gas protection device according to claim 1, characterized in that: The back gas protection zone (7) is fixed in the stainless steel pipe by traction with a steel wire rope (8).

6. A stainless steel pipe butt weld back gas protection device according to claim 1, characterized in that: The sealing rubber sheet (2) is in close contact with the stainless steel pipe wall.

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