CN110788461A

CN110788461A - Steel pipe welding auxiliary device

Info

Publication number: CN110788461A
Application number: CN201911288008.1A
Authority: CN
Inventors: 李建雄
Original assignee: Xinyi Jia Jia Stainless Steel Products Co Ltd
Current assignee: Xinyi Jia Jia Stainless Steel Products Co Ltd
Priority date: 2019-12-15
Filing date: 2019-12-15
Publication date: 2020-02-14

Abstract

The invention aims to provide a steel pipe welding auxiliary device to reduce or avoid the oxidation of a steel pipe welding seam in the welding and cooling processes. The invention comprises an inner wall sealing plate, a protection chamber and a protection gas supply device, wherein the protection chamber is provided with a through horizontal through hole for a steel pipe to pass through; the inner wall sealing plate is suspended and fixed in a projection range of the horizontal through hole in the vertical direction through a support extending from front to back; the inner wall sealing plate is positioned in the protection cavity or behind the protection cavity; the protective gas supply device is provided with two gas outlet pipes, wherein the first gas outlet pipe is communicated with the protective chamber and used for inputting protective gas into the protective chamber, and the second gas outlet pipe is positioned in the projection range of the horizontal through hole in the vertical direction and extends to the direction of the protective chamber from the front. The invention can not only carry out gas protection on the welding spot of the inner wall of the steel pipe, but also carry out gas protection on the welding spot in the process of cooling the welding spot, thereby reducing the possibility of oxidizing the welding spot and the welding spot.

Description

Steel pipe welding auxiliary device

Technical Field

The invention belongs to the technical field of machining, and particularly relates to a steel pipe welding auxiliary device.

Background

The main production flow of the stainless steel pipe is as follows: firstly, cutting a stainless steel plate roll into corresponding widths according to requirements to form a stainless steel ribbon board, then forming a tubular structure by the stainless steel ribbon board through a tube mill, and finally welding the gaps of the tubular structure. The welding procedure is the most important process for stainless steel pipes, and in order to avoid oxidation of welding seams, the stainless steel is mainly welded by argon arc, and the protective gas for argon arc welding is pure argon. However, welding is performed outside the steel pipe, and the weld joint on the inner wall of the steel pipe cannot be protected by argon gas, and is very easily oxidized. In addition, because the temperature during welding is very high, the welding seam can only be cooled naturally by radiating heat in the air, and the welding seam cannot be protected by argon gas in the cooling process, so that certain oxidation can occur, and the strength of the welding seam is reduced.

Disclosure of Invention

The invention aims to provide a steel pipe welding auxiliary device to reduce or avoid the oxidation of a steel pipe welding seam in the welding and cooling processes.

The auxiliary device for welding the steel pipe comprises an inner wall sealing plate, a protective cavity and a protective gas supply device, wherein the protective cavity is provided with a through horizontal through hole for the steel pipe to pass through; the inner wall sealing plate is suspended and fixed in a projection range of the horizontal through hole in the vertical direction through a support extending from front to back; the inner wall sealing plate is positioned in the protection cavity or behind the protection cavity; the protective gas supply device is provided with two gas outlet pipes, wherein the first gas outlet pipe is communicated with the protective chamber and used for inputting protective gas into the protective chamber, and the second gas outlet pipe is positioned in the projection range of the horizontal through hole in the vertical direction and extends to the direction of the protective chamber from the front.

The front-back direction refers to the advancing direction of the steel pipe, and the steel pipe advances from front to back under the action of external force.

The steel pipe is by preceding horizontal through-hole that passes backward, the support stretches into from the not welded gap department of steel pipe, with the unsettled position department that is fixed in the solder joint rear of steel pipe inside of inner wall closing plate, the outer fringe of inner wall closing plate is close or contacts with the inner wall of steel pipe, in order to provide certain sealed, make inside opening orientation solder joint direction that forms of steel pipe, the other end is close confined tubular structure, the second outlet duct also is stretched into in this tubular structure by the not welded gap department of steel pipe, and inside input protective gas. When welding, the welding point department of steel pipe outer wall has welding equipment to protect from the protective gas of taking, and the welding point department of steel pipe inner wall utilizes the protective gas that the second outlet duct was inputed to protect, just so makes the welding point of steel pipe inside and outside wall department can both obtain protective gas's protection, avoids welding point department to appear oxidizing.

When the steel pipe advances, the position of the weld joint which is just welded can enter the protection cavity, a space close to sealing is formed between the protection cavity and the outer wall of the steel pipe, and the first air outlet pipe inputs protective gas into the space, so that the protective gas can be protected for the weld joint in the process of gradually cooling the weld joint, and the weld joint is prevented from being oxidized. Meanwhile, the welding seam on the inner wall of the steel pipe is still protected by the protective gas input by the second gas outlet pipe and cannot be oxidized.

Furthermore, polishing equipment is arranged in the protection cavity, and the welding seam of the steel pipe is polished in the protection cavity, so that the welding seam is prevented from being oxidized in the polishing process.

Further, first outlet duct, second outlet duct all are equipped with a plurality of spaced gas outlets, and the direction of giving vent to anger of gas outlet all faces towards the welding seam direction of steel pipe to improve the protective gas concentration of welding seam department emphatically, reduce the possibility that the welding seam oxidized.

Furthermore, a detachable sealing curtain is arranged at the through hole of the protection cavity, and the inner wall sealing plate is detachably fixed at the end part of the support, so that the inner wall sealing plate and the sealing curtain with different sizes and shapes can be replaced according to requirements, the sealing performance of the inner wall of the steel pipe and the sealing performance of the protection cavity are improved, and unnecessary leakage of protective gas is reduced. In addition, when the sealing curtain and the inner wall sealing plate are damaged due to overlong use time, the sealing curtain and the inner wall sealing plate can be correspondingly replaced.

The auxiliary device for welding the steel pipe can protect the welding spot on the inner wall of the steel pipe by gas on the premise of not influencing the normal welding of the steel pipe, and can also protect the welding spot by gas in the process of cooling the welding spot, thereby reducing the possibility that the welding spot and the welding spot are oxidized, effectively improving the strength of the welding spot and having good practicability.

Drawings

Fig. 1 is a schematic structural view of a pipe welding auxiliary device of the present invention.

Fig. 2 is a front view of the protection chamber.

The figures are numbered: 1. an inner wall sealing plate; 2. a protective chamber; 3. a horizontal through hole; 4. a steel pipe; 5. a support; 6. a first air outlet pipe; 7. a second air outlet pipe; 8. a sealing curtain; 9. and (7) welding points.

Detailed Description

The following describes embodiments of the present invention, such as shapes and structures of respective members, mutual positions and connection relationships between respective portions, and actions and operation principles of the respective portions, in further detail, with reference to the accompanying drawings.

Example 1:

the embodiment provides a steel pipe welding auxiliary device to reduce or avoid the steel pipe welding seam to be oxidized in welding and cooling process.

As shown in fig. 1 and 2, the auxiliary device for welding a steel pipe of this embodiment includes an inner wall sealing plate 1, a protective chamber 2, and a protective gas supply device (the protective gas supply device is not shown in the drawings, and specifically, an argon gas generating device and the like may be used), wherein horizontal through holes 3 are formed in the front and rear side walls of the protective chamber 2 for the steel pipe to pass through; the contour of the inner wall sealing plate 1 is the same as that of the steel pipe 4 and is slightly smaller than that of the steel pipe 4; the inner wall sealing plate 1 is suspended and fixed in the projection range of the horizontal through hole 3 in the vertical direction through a bracket 5 extending from front to back; the inner wall sealing plate 1 is positioned in the protective cavity 2, the protective gas supply device is provided with two gas outlet pipes, wherein a first gas outlet pipe 6 is communicated with the protective cavity 2 and used for inputting protective gas into the protective cavity 2, and a second gas outlet pipe 7 is positioned in the projection range of the horizontal through hole 3 in the vertical direction, is fixed through a support 5 and extends to the direction of the protective cavity 2 from the front.

Of course, the inner wall sealing plate 1 may also be located behind the protection chamber 2, the position of the inner wall sealing plate 1 is related to the length of the protection chamber 2, the traveling speed of the steel pipe 4 and the cooling speed of the welding seam, and the position of the inner wall sealing plate 1 is set according to the following principle: before the welding seam of the steel pipe 4 is cooled to a preset temperature, the position of the welding seam does not move to the inner wall sealing plate 1, and therefore the welding seam can be cooled by the protective gas output by the second gas outlet pipe 7.

In this embodiment, first outlet duct 6, second outlet duct 7 all extend along the axial direction of steel pipe 4, and first outlet duct 6, second outlet duct 7 all are equipped with a plurality of spaced gas outlets, and the direction of giving vent to anger of gas outlet all faces towards the welding seam direction in steel pipe 4 to put forward emphasis to the protective gas concentration that improves welding seam department, reduce the possibility that the welding seam was oxidized.

The horizontal through hole 3 of the protection chamber 2 is provided with a detachable sealing curtain 8 (as shown in fig. 2) through a bolt, the inner wall sealing plate 1 is detachably fixed at the end part of the bracket 5 through thread fit, so that the inner wall sealing plate 1 and the sealing curtain 8 with different sizes and shapes can be replaced as required, the sealing performance of the inner wall of the steel pipe 4 and the sealing performance of the protection chamber 2 are improved, and unnecessary leakage of protection gas is reduced. In addition, when the sealing curtain 8 and the inner wall sealing plate 1 are damaged due to overlong use time, the sealing curtain and the inner wall sealing plate can be replaced correspondingly. The protection chamber 2, the sealing curtain 8 and the inner wall sealing plate 1 can be made of high temperature resistant materials (such as steel plates or the like).

The front-rear direction refers to a traveling direction of the steel pipe 4 (arrow direction in fig. 1), and the steel pipe 4 travels from front to rear by an external force.

The steel pipe 4 passes horizontal through-hole 3 backward by the preceding, support 5 stretches into from steel pipe 4 unwelded gap department, with the unsettled position department that is fixed in the welding spot 9 rear of steel pipe 4 inside of inner wall closing plate 1, the outer fringe of inner wall closing plate 1 is close or the contact with the inner wall of steel pipe 4, in order to provide certain sealed, make inside opening of forming of steel pipe 4 towards welding spot 9 direction, the other end is close confined tubular structure, second outlet duct 7 also stretches into in this tubular structure by steel pipe 4 unwelded gap department, and inside input protective gas. During welding, the welding spot 9 of the outer wall of the steel pipe 4 is protected by the shielding gas of the welding equipment, and the welding spot 9 of the inner wall of the steel pipe 4 is protected by the shielding gas input by the second air outlet pipe 7, so that the welding spot 9 of the inner wall and the outer wall of the steel pipe 4 can be protected by the shielding gas, and the welding spot 9 is prevented from being oxidized.

When the steel pipe 4 advances, the position of the weld joint which is just welded enters the protection chamber 2, a space close to sealing is formed between the outer walls of the protection chamber 2 and the steel pipe 4, and the first air outlet pipe 6 inputs protective gas into the space, so that the protective gas can be protected for the weld joint in the process of gradually cooling the weld joint, and the weld joint is prevented from being oxidized. Meanwhile, the welding seam on the inner wall of the steel pipe 4 is still protected by the protective gas input by the second gas outlet pipe 7 and cannot be oxidized.

The protection chamber 2 is also internally provided with a polishing device (the polishing device is not shown in the figure), and the welding seam of the steel pipe 4 is polished in the protection chamber 2, so that the welding seam can be prevented from being oxidized in the polishing process.

Above-mentioned steel pipe welding auxiliary device not only can carry out gas protection to the solder joint 9 department of 4 inner walls of steel pipe under the prerequisite that do not influence steel pipe 4 normal welding, can also carry out gas protection to the welding seam at the refrigerated in-process of welding seam to reduce solder joint 9 and the welding seam and oxidized the possibility, effectively improved the intensity of welding seam department, had fine practicality.

The invention has been described in connection with the accompanying drawings, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description, as long as the invention is capable of being practiced without modification in any way whatsoever, and is capable of other applications without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The auxiliary device for welding the steel pipe is characterized by comprising an inner wall sealing plate, a protective cavity and a protective gas supply device, wherein the protective cavity is provided with a through horizontal through hole for the steel pipe to pass through; the inner wall sealing plate is suspended and fixed in a projection range of the horizontal through hole in the vertical direction through a support extending from front to back; the inner wall sealing plate is positioned in the protection cavity or behind the protection cavity; the protective gas supply device is provided with two gas outlet pipes, wherein the first gas outlet pipe is communicated with the protective chamber and used for inputting protective gas into the protective chamber, and the second gas outlet pipe is positioned in the projection range of the horizontal through hole in the vertical direction and extends to the direction of the protective chamber from the front.

2. The steel pipe welding auxiliary device according to claim 1, wherein a polishing device is provided in the protection chamber.

3. The auxiliary device for welding the steel pipes according to claim 1, wherein the first air outlet pipe and the second air outlet pipe are provided with a plurality of spaced air outlets, and the air outlet directions of the air outlets face the direction of the welding seam of the steel pipe.

4. The auxiliary device for welding the steel pipes as claimed in claim 1, wherein the protective chamber is provided with a detachable sealing curtain at the through hole, and the inner wall sealing plate is detachably fixed at the end of the bracket.