KR102599591B1 - Automatic welding device - Google Patents

Abstract

The present invention relates to an automatic welding device configured to weld a corrugated pipe and a flange pipe connected thereto in accordance with various diameters of the corrugated pipe and the flange pipe during joint welding. More specifically, welding the corrugated pipe and the flange pipe. A welding portion that is seated and supported so that the portions are joined, and moves along the joined weld portion to weld the joined weld portion; and a control unit that controls the welding portion, wherein the welding portion is open at the top and arranged so that the welded portions of the corrugated pipe and the flange pipe are mutually joined, and a lower body on which the lower portion of the corrugated pipe and the flange pipe are seated; And an upper body disposed on the upper part of the lower body, one side of which is pivotably supported on one side of the lower body, opening and closing the open upper part of the lower body, and supporting the upper part of the corrugated pipe and the flange pipe when closed, It relates to an automatic welding device in which a clamp supporting the outer circumference of the corrugated pipe and the flange pipe is coupled to the lower body and the upper body in accordance with the welding position.

Description

Automatic welding device {AUTOMATIC WELDING DEVICE}

The present invention relates to a flow-through automatic welding device, and in particular, to an automatic welding device configured to weld a corrugated pipe and a flange pipe connected to the corrugated pipe according to various diameters of the corrugated pipe and the flange pipe during joint welding.

Until recently, automatic welding devices for joint welding two pipes have already been disclosed, but most of them are methods for joint welding two general pipes such as pipes. However, there is still no technology for welding a flange pipe and a corrugated pipe.

In the process of joint welding corrugated pipes and flange pipes, welding has traditionally been performed manually. Manual welding has limitations in welding uniformity and accuracy, has a high defect rate, and requires a long welding time. Therefore, there is a demand that automation of welding work is also necessary.

As a countermeasure to this, automatic welding technology has been developed. However, the existing automatic welding device often had poor welding quality due to insufficient pressing force on the welded area of the corrugated pipe and flange pipe. This is because the welding electrode is fixed and cannot apply sufficient pressure to the welding area.

Therefore, in order to improve this problem, we would like to propose an automatic welding device for joint welding a flange pipe and a corrugated pipe.

(0001) Korean Patent Publication No. 10-2022-0090445 (2022.06.29.)

The technical problem to be solved by the present invention is to provide an automatic welding device configured to save manpower and time by efficiently performing joint welding of a flange pipe and a corrugated pipe.

Another technical problem to be solved by the present invention is to provide an automatic welding device that can be applied to welding flange pipes and corrugated pipes having various diameters through clamps.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below. You will be able to.

An automatic welding device according to an embodiment of the present invention for achieving the above technical problem relates to an automatic welding device for welding a corrugated pipe and a flange pipe connected to the corrugated pipe, and the welding portion of the corrugated pipe and the flange pipe. A welding portion that is seated and supported to be temporarily joined and moves along the joined weld portion to weld the joined weld portion; and a control unit that controls the welding portion, wherein the welding portion is open at the top and arranged so that the welded portions of the corrugated pipe and the flange pipe are mutually joined, and a lower body on which the lower portion of the corrugated pipe and the flange pipe are seated; And an upper body disposed on the upper part of the lower body, one side of which is pivotably supported on one side of the lower body, opening and closing the open upper part of the lower body, and supporting the upper part of the corrugated pipe and the flange pipe when closed, A clamp that supports the outer circumference of the corrugated pipe and the flange pipe is coupled to the lower body and the upper body in accordance with the welding position.

In addition, the lower body includes a rotating body that rotates while maintaining a set radius while the welding electrode is coupled; And a guide frame that has an open upper part and is disposed surrounding the rotating body so as not to interfere with the rotating motion of the rotating body.

In addition, the guide frame includes a first support frame formed with a first support groove for supporting the clamp for seating the corrugated pipe; and a second support frame formed with a second support groove supporting the clamp for seating the flange pipe.

In addition, the clamp is inserted and supported in the lower body, and a 1-1 clamp on which the lower part of the corrugated pipe is seated; A 1-2 clamp that is inserted and supported in the upper body and pressurizes and supports the upper part of the corrugated pipe; A 2-1 clamp that is inserted and supported in the lower body and on which the lower part of the flange pipe is seated; and a 2-2 clamp that is inserted and supported into the upper body and pressurizes and supports the upper part of the flange pipe.

In addition, the 1-1 clamp and the 1-2 clamp have opposite shapes, and include first support parts inserted and supported into the lower body and the upper body, respectively; and a second support part connected to the first support part and having a seating surface corresponding to the outer diameter of the ridge of the corrugated pipe.

In addition, the 2-1 clamp and the 2-2 clamp have opposite shapes, and include a third support portion inserted into and supported by the lower body and the upper body, respectively; And a fourth support part connected to the third support part, having an insertion groove into which the flange of the flange tube is inserted, and having a support surface on which a lower portion of the outer circumference of the flange tube excluding the flange is supported is formed. .

In addition, the upper body is characterized by including a visible window through which the welding state can be observed.

In addition, the other side of the lower body and the upper body further includes locking means for maintaining the closed state of the lower body and the upper body when closed.

The above aspects of the present invention are only some of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention will be described in detail below by those skilled in the art. It can be derived and understood based on.

The present invention described above has the following effects.

First, it can be effectively applied to joint welding of flange pipes and corrugated pipes, and in particular, joint welding of flange pipes and corrugated pipes of various diameters is possible through clamps.

In addition, since the welding electrode is coupled to the rotating body and rotates to pressurize the welding area, the overall welding quality of the welding area can be improved.

Additionally, by applying an automated welding process to save manpower and time, the safety and productivity of welding work can be increased.

The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1 is a perspective view showing the closed state of the lower body and the upper body according to an embodiment of the automatic welding device of the present invention;
Figure 2 is a perspective view showing the open state of the lower body and the upper body according to an embodiment of the automatic welding device of the present invention;
Figure 3 is a view showing the rotational state of the rotating body to which the welding electrode is coupled according to an embodiment of the automatic welding device of the present invention;
4 is a diagram showing a clamp according to the present invention;
5A to 5C are diagrams showing a state of use according to one embodiment of the automatic welding device of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through illustrative drawings. When adding reference numerals to components in each drawing, it should be noted that identical components are given the same reference numerals as much as possible even if they are shown in different drawings. Additionally, when describing embodiments of the present invention, if detailed descriptions of related known configurations or functions are judged to impede understanding of the embodiments of the present invention, the detailed descriptions will be omitted.

Additionally, in describing the components of embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, sequence, or order of the component is not limited by the term. When a component is described as being "connected," "coupled," or "connected" to another component, that component may be directly connected or connected to that other component, but there is no "interconnection" between each component. It should be understood that they may be “connected,” “coupled,” or “connected.”

Figure 1 is a perspective view showing the closed state of the lower body and the upper body according to an embodiment of the automatic welding device of the present invention, and Figure 2 is an open state of the lower body and the upper body according to an embodiment of the automatic welding device of the present invention. It is a perspective view, and Figure 3 is a diagram showing the rotational state of the rotating body to which the welding electrode is coupled according to an embodiment of the automatic welding device of the present invention, and Figure 4 is a diagram showing the clamp according to the present invention.

With reference to FIGS. 1 to 4, the automatic welding device according to the present invention will be described.

The automatic welding device of the present invention is for welding a corrugated pipe (10) and a flange pipe (20) connected to the corrugated pipe (10). To this end, the automatic welding device of the present invention may be largely configured to include a welding unit 100 and a control unit 200.

Wrinkle Bend and Flanged Bend are pipe connection parts used when connecting pipes or fittings (joints).

The corrugated pipe 10 is one of the pipe connection parts and can be used to connect two or more pipes or change the direction of the pipes. As the name suggests, it is a connecting part made by folding the wall of a pipe into a wrinkle shape. It can create a connection where the inner and outer diameters of the pipe are the same, and peaks and valleys can be continuously placed on part or all of the outside.

The flange pipe 20 is also one of the pipe connection parts, and can be used to create an easily detachable pipe connection by connecting a pipe, band pipe, valve, etc. The flange 21 is generally circular, and the part that comes into contact with a connection part such as a pipe or valve is manufactured in a flat shape.

The welding portion 100 is seated so that the welded portions of the corrugated pipe 10 and the flange pipe 20 are joined to each other, and the welding electrode 111-1 moves along the welded portion of the corrugated pipe 10 and the flange pipe 20. It can be welded by melting the welded area and applying pressure. For this purpose, the welded portion 100 may be composed of a lower body 110 and an upper body 120.

The lower body 110 may be disposed at a predetermined height above the floor. To this end, the lower part is supported on the floor, and the lower body 110 may be connected to the upper end of the frame extending vertically upward from the lower part. The welding unit 100 may be connected to a control unit 200, which will be described later, through a frame.

The lower body 110 may have an opening (drawing number not shown) formed at the top. A space (drawing number not shown) having a larger diameter than the diameter of the corrugated pipe 10 or the flange pipe 20 is formed at the lower part of the opening so that the lower part of the corrugated pipe 10 and the flange pipe 20 can be seated and supported. It can be.

The lower body 110 may include a rotating body 111 and a guide frame 112.

The rotating body 111 can rotate along the edge of the space while maintaining the set radius. At this time, the set radius is preferably set larger than the outer diameter of the corrugated pipe 10 and the flange pipe 20. The rotating body 111 may rotate through a gear unit (not shown) linked to a drive motor (not shown). The drive motor may include a servo motor to precisely control the rotation speed of the rotating body 111. A welding electrode 111-1 may be fixedly coupled to the rotating body 111. The welding electrode 111-1 may rotate along the rotating body 111 while in contact with the welded portion of the corrugated pipe 10 and the flange pipe 20. Current is applied to the welded portion through the welding electrode 111-1, and as the current is applied, heat is generated and melted at the welded portion of the corrugated pipe 10 and the flange pipe 20. In a molten state, the welding electrode 111-1 presses the welded area with a constant pressure, and through this, the molten welded areas are combined into one and welded.

The component for rotating the rotating body 111 may apply various known technologies, and since the component for rotating the rotating body 111 itself is a known technology, detailed description thereof will be omitted for convenience.

The guide frame 112 has an open top. Except for the open upper part of the guide frame 112, the remaining parts are arranged to surround the rotating body 111, but are arranged so as not to interfere with the rotating movement of the rotating body 111. For this purpose, a rotation guide groove (drawing number not shown) may be formed in the guide frame 112 along the rotation radius of the rotation body 111.

The first support frame 113 and the second support frame 114 may be coupled to the guide frame 112.

A first support groove 113-1 may be formed in the first support frame 113 to support the clamp 300 for seating the corrugated pipe 10.

A second support groove 114-1 may be formed in the second support frame 114 to support the clamp 300 for seating the flange pipe 20.

The first support groove 113-1 and the second support groove 114-1 may be formed to correspond to the support portion of the clamp 300 so that the clamp 300, which will be described later, can be inserted and supported.

Of course, it would also be possible to form the first and second support grooves in the guide frame 112 itself without constructing the first support frame 113 and the second support frame 114 separately.

In addition, the first support frame 113 and the second support frame 114 may be formed in the same way on the upper body 120, and the first support frame 113 formed on the lower body 110 and the upper body 120 ) and the second support frame 114 may be configured to face each other.

The upper body 120 is disposed on the upper part of the lower body 110. One side of the upper body 120 is rotatably connected to one side of the lower body 110. The upper body 120 can open and close the open upper part of the lower body 110 by rotating about one side that is supported for rotation. When the upper body 120 closes the open upper part of the lower body 110, it can support the upper parts of the corrugated pipe 10 and the flange pipe 20.

The upper body 120 may be provided with a visible window 121 so that the welding state can be checked from the outside. The visible window 121 may be specially treated, for example, oxidation or film treatment of glass, or special optical coating, so that the state of the object to be welded can be checked while blocking bright light generated by the welding arc.

The visible window 121 may be arranged to check the welding state of the welding electrode 111-1 coupled to the rotating body 111, for example, on the upper part of the upper body 120.

In addition, when the open upper part of the lower body 110 is closed, the other side of the upper body 120 contacts the other side of the lower body 110, and the upper part of the lower body 110 opened by the upper body 120 is closed. do.

A hole (drawing number not shown) is formed inside the closed lower body 110 and upper body 120 in a direction perpendicular to the rotation direction of the rotating body 111. The shape of the hole may correspond to the outer circumferential shape of the corrugated pipe 10 and the flange pipe 20. The diameter of the hole may be larger than the diameters of the corrugated pipe 10 and the flange pipe 20. If the diameter of the hole is small, the corrugated pipe 10 and the flange pipe 20 cannot be seated, making the welding work itself impossible. Therefore, it is desirable to manufacture the diameter of the hole in consideration of the diameters of the corrugated pipe 10 and the flange pipe 20 to be worked.

That is, the diameter of the hole is larger than the maximum diameter of the corrugated pipe 10 and the flange pipe 20, which are the objects of welding work. Therefore, for welding work, the central axes of the corrugated pipe 10 and the flange pipe 20 to be worked must be aligned with the central axis of the hole. For this purpose, clamps 300, which will be described later, are installed on the lower body 110 and the upper body 120. By combining, the central axes of the corrugated pipe 10 and the flange pipe 20, which have different diameters from the hole, are aligned with the central axis of the hole, and a welding electrode 111 is formed around the welded area of the corrugated pipe 10 and the flange pipe 20. -1) can be arranged so that it touches.

Locking means 400 may be disposed on the other side of the lower body 110 and the upper body 120 to maintain the lower body 110 and the upper body 120 in a closed state. The locking means 400 may be composed of a locking means 400 such as a cicada hook to maintain the other side of the lower body 110 and the upper body 120 in close contact with each other. That is, the lower body 110 and the upper body 120 can be maintained in close contact with each other using a cicada ring, etc., and through this, welding work can be performed safely.

Since the radius of rotation of the welding electrode (111-1) coupled to the rotating body 111 is uniform, the welding area is adjusted to the radius of rotation of the welding electrode (111-1) according to the diameters of the corrugated pipe (10) and the flange pipe (20). must be located. For this purpose, a clamp 300 that supports the outer circumference of the corrugated pipe 10 and the flange pipe 20 may be coupled to the lower body 110 and the upper body 120 according to the welding position.

The clamp 300 may be composed of a 1-1 clamp 310, a 1-2 clamp 320, a 2-1 clamp 330, and a 2-2 clamp 340.

The 1-1 clamp 310 is inserted and supported in the lower body 110, and the lower part of the corrugated pipe 10 can be seated.

The 1-2 clamp 320 is inserted and supported in the upper body 120, and the upper part of the corrugated pipe 10 can be seated.

The 2-1 clamp 330 is inserted and supported in the lower body 110, and the lower part of the flange pipe 20 can be seated.

The 2-2 clamp 340 is inserted and supported in the upper body 120, and the upper part of the flange tube 20 can be seated.

The 1-1 clamp 310 and the 1-2 clamp 320 have opposite shapes, and the 2-1 clamp 330 and the 2-2 clamp 340 also have opposite shapes. That is, the 1-1 clamp 310 and the 1-2 clamp 320 surround and support the entire lower and upper parts of the corrugated pipe 10, and the 2-1 clamp 330 and the 2-2 clamp (340) is a structure that surrounds and supports the entire lower and upper parts of the flange pipe (20).

Therefore, since they have the same structure but only the opposite direction, only the 1-1 clamp 310 for the corrugated pipe 10 coupled to the lower body 110 and the 2-1 clamp 330 for the flange pipe 20 are used. To explain, it will be understood that the 1-2 clamp 320 and the 2-2 clamp 340 are coupled to the upper body 120 in opposite directions.

The lower part of the 1-1 clamp 310 may be formed with a first support portion 311 inserted into the lower body 110, that is, the first support groove 113-1. The first support portion 311 may correspond to the shape of the first support groove 113-1.

A second support part 312 may be formed on the first support part 311. The first support portion 311 and the second support portion 312 may be formed integrally, or may be formed separately and coupled to each other. The second support portion 312 may be formed to correspond to the outer diameter of the corrugated pipe 10, that is, a seating surface 312-1 on which the outer diameter is supported. The seating surface 312-1 may be configured to seat the entire ridge of the corrugated pipe 10, or may be configured to seat a portion of the ridge of the corrugated pipe 10. The seating surface 312-1 may be configured in a hemispherical shape to match the shape of the lower part of the corrugated pipe 10.

The lower part of the 2-1 clamp 330 may be formed with a third support portion 331 inserted into the lower body 110, that is, the second support groove 114-1. The third support portion 331 may correspond to the shape of the second support groove 114-1.

A fourth support part 332 may be formed on the third support part 331. The third support portion 331 and the fourth support portion 332 may be formed integrally, or may be formed separately and coupled to each other. An insertion groove 332-1 into which the flange 21 of the flange pipe 20 is inserted may be formed in the fourth support portion 332. The insertion groove 332-1 may correspond to the formation of the flange 21. A support surface 332-2 may be formed around the upper portion of the insertion groove 332-1 formed in the fourth support portion 332. The support surface 332-2 may support the lower outer peripheral surface of the flange tube 20, excluding the flange 21 of the flange tube 20. The support surface 332-2 may be configured in a hemispherical shape to match the shape of the lower part of the flange pipe 20.

At this time, the important thing is that the rotating welding electrode (111-1) rotates based on one central point, and the corrugated pipe (10) and the flange pipe (20) are aligned with the central axis line orthogonal to the rotation direction of the welding electrode (111-1). This should be located. Therefore, it is desirable to manufacture the clamp 300 in consideration of the diameters of the corrugated pipe 10 and the flange pipe 20 to be worked.

The control unit 200 is connected to the welding unit 100 and can control the welding unit 100. The control unit 200 controls the rotation, stop, and rotation speed of the rotating body 111, and controls whether or not current is applied to the welding electrode 111-1 and the intensity and time of the applied current.

The control unit 200 is equipped with a separate display 210 for monitoring welding operations, through which the control status can be checked.

5A to 5C are diagrams showing a state of use according to one embodiment of the automatic welding device of the present invention. Figure 5a is a view showing the state in which the corrugated pipe and the flange pipe are respectively arranged in the lower body, Figure 5b is a view of the welding operation state according to the present invention, and Figure 5c is a view of the corrugated pipe and the flange pipe welded after the welding operation according to the present invention. This is a diagram showing the state of separation.

With reference to FIGS. 5A to 5C, the state of use of the automatic welding device according to the present invention described above will be described.

First, as shown in Figure 5a, the clamp 300 prepared according to the diameter of the corrugated pipe 10 and the flange pipe 20 to be welded is coupled to each position of the lower body 110 and the upper body 120. The corrugated pipe 10 and the flange pipe 20 are mounted on the welded portion 100 through the clamp 300.

After confirming that the welded portions of the corrugated pipe 10 and the flange pipe 20 are aligned in the correct position, as shown in FIG. 5B, the upper body 120 is coupled to the lower body 110 to form the lower body 110. Close the open upper part of. In the closed state, the closed state is maintained using the locking means 400.

Thereafter, power is applied to the welding unit 100 through the control unit 200, and the rotation speed and time (or number of rotations) of the rotating body 111 are calculated based on the material and thickness of the corrugated pipe 10 and the flange pipe 20. Set the intensity of the current applied to the welding electrode 111-1.

Once the setting is complete, welding begins.

The welding process or whether welding is in progress can be confirmed through the visible window 121 disposed at the top of the upper body 120. According to the confirmation result through the visible window 121, for example, if the rotating body 111 does not rotate normally or the welding operation does not proceed normally, the welding operation of the welding portion 100 is stopped using the control unit 200, Relevant safety measures can be taken.

Finally, as shown in Figure 5c, when the welding work is completed, the locking means 400 is released to return the upper body 120 to its original position to open the closed state, and then the corrugated pipe 10 and the flange pipe for which the welding work is completed (20) is separated from the welded portion (100). The above-described procedure can be performed repeatedly.

According to the present invention described above, it can be effectively applied to joint welding the flange pipe 20 and the corrugated pipe 10 provided with the flange 21, and in particular, the corrugated pipe 10 of various diameters through the clamp 300. ) and the flange pipe 20 are not only possible to do joint welding, but the safety and productivity of welding work can be increased by applying an automated welding process to save manpower and time.

In the above, even though all the components constituting the embodiment of the present invention have been described as being combined or operated in combination, the present invention is not necessarily limited to this embodiment. That is, as long as it is within the scope of the purpose of the present invention, all of the components may be operated by selectively combining one or more of them. In addition, terms such as “include,” “comprise,” or “have” described above mean that the corresponding component may be present, unless specifically stated to the contrary, and thus do not exclude other components. Rather, it should be interpreted as being able to include other components. All terms, including technical or scientific terms, unless otherwise defined, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the contextual meaning of the related technology, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in the present invention.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments posted in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these examples. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

10: Corrugated pipe 20: Flange pipe
21: Flange
100: welding portion 110: lower body
111: Rotating body 111-1: Welding electrode
112: Guide frame 113: First support frame
113-1: first support groove 114: second support frame
114-1: Second support groove 120: Upper body
121: Thorn Spear
200: control unit 210: display
300: Clamp 310: 1-1 clamp
311: first support 312: second support
312-1: Seating surface 320: 1-2 clamp
321: first support 322: second support
322-1: Seating surface 330: 2-1 clamp
331: third support 332: fourth support
332-1: Insertion groove 332-2: Support surface
340: 2-2 clamp 341: third support
342: Fourth support 342-1: Insertion groove
342-2: Support surface
400: Locking means

Claims (8)

It relates to an automatic welding device for welding a corrugated pipe and a flange pipe connected to the corrugated pipe,
a welding portion that is seated and supported so that the welded portions of the corrugated pipe and the flange pipe are joined, and moves along the joined welded portion to weld the joined welded portion; and
It includes a control unit that controls the welding unit,
The welding part,
A lower body whose upper part is open and arranged so that welded portions of the corrugated pipe and the flange pipe are joined to each other, and on which the lower part of the corrugated pipe and the flange pipe are seated; and
An upper body disposed on the upper part of the lower body, one side of which is pivotably supported on one side of the lower body, opens and closes the open upper part of the lower body, and supports the upper part of the corrugated pipe and the flange pipe when closed,
A clamp is coupled to the lower body and the upper body to support the outer circumference of the corrugated pipe and the flange pipe according to the welding position,
The lower body is,
A rotating body that rotates while maintaining a set radius while the welding electrode is coupled; and
The upper part is open and includes a guide frame arranged to surround the rotating body so as not to interfere with the rotating motion of the rotating body,
In the guide frame,
a first support frame formed with a first support groove to support the clamp for seating the corrugated pipe; and
A second support frame formed with a second support groove supporting the clamp for seating the flange pipe is coupled,
The clamp is,
A 1-1 clamp that is inserted and supported in the lower body and on which the lower part of the corrugated pipe is seated;
A 1-2 clamp that is inserted and supported in the upper body and presses and supports the upper part of the corrugated pipe;
A 2-1 clamp that is inserted and supported in the lower body and on which the lower part of the flange pipe is seated; and
It is inserted into the upper body and includes a 2-2 clamp that pressurizes and supports the upper part of the flange pipe,
The 1-1 clamp and the 1-2 clamp have opposite shapes,
a first support portion protruding outward from the outer circumference to be inserted and supported into each of the lower body and the upper body; and
It is connected to the first support part and includes a second support part formed with a seating surface corresponding to the outer diameter of the mountain of the corrugated pipe,
The 2-1 clamp and the 2-2 clamp have opposite shapes,
a third support portion protruding outward from the outer circumference to be inserted and supported into each of the lower body and the upper body; and
An automatic welding device comprising a fourth support part connected to the third support part, an insertion groove into which the flange of the flange tube is inserted, and a support surface for supporting a lower portion of the outer circumference of the flange tube excluding the flange. delete delete delete delete delete According to claim 1,
The upper body is,
An automatic welding device that includes a visible window through which the welding state can be observed. According to claim 1 or 7,
On the other side of the lower body and the upper body,
An automatic welding device further comprising locking means to maintain the lower body and the upper body in a closed state when closed.

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