KR100909083B1 - Automatic welding apparatus for circumference of pipe - Google Patents

Abstract

An automatic welding device for pipe perimeter is provided to reduce the time for welding and improve welding uniformity by welding both ends of a pipe while rotating the pipe. An automatic welding device for pipe perimeter comprises a base frame(10) installed on the ground, a first rotary unit(30) which is combined in the upper one side of the base frame and in which torque is generated by a driving part, a second rotary unit(40) combined in the upper other side of the base frame corresponding to the first rotary unit, a jig base(20) which is axially connected to the first and the second rotary unit and fixes a pipe, an automatic welding unit(50) which is installed on the base frame and automatically welds both end perimeter of the pipe, and a dust cover installed on the base frame to collect sludge produced in welding.

Description

Automatic welding apparatus for circumference of pipe}

The present invention relates to a pipe, such as a seat frame for an automobile, and more particularly, to an automatic welding device for the circumference of the pipe to automatically weld the circumference of the pipe both ends so as to join both ends of the bent pipe.

To join metal products such as pipes used as seat frames for automobiles and pipes used in industrial sites, or to join both ends of bent pipes to each other, a user directly holds and welds a welder.

That is, in the state where the pipe to be welded is placed on the floor or installed at a predetermined height, the user grabs the welder and welds the welding part of the pipe while moving, or stops the welder when the upper side of the pipe is welded. After turning the pipe upside down so that the lower side of the pipe is located upwards and weld again using a welder.

However, the welding of such pipes is accompanied by the installation and upturning of the pipes to join the both ends of the pipes, and thus the welding of the pipes is very inconvenient as well as the welding time of the pipes. Due to the large amount of losses, there is a problem that the work efficiency due to the welding operation of the pipe is lowered.

In addition, as the welding work of the pipe is performed by hand, such as installing and inverting the pipe, there is also a problem in that a defective rate of the product is increased because welding at the welding portion of the pipe is not constant.

In addition, in order to weld the welded portion of the pipe constantly, there is a problem that the product cost and labor cost increase as the skilled worker works, as well as a problem that the defective rate of the product cannot be significantly reduced even if the skilled worker performs the welding work. .

On the other hand, in the case of welding the pipe in preparation for safety accidents, the worker is provided with a protective helmet such as a welding helmet and protective gloves, and then the welding work is very inconvenient because the protective equipment is heavy and cumbersome.

In addition, when the welding work of the pipe is carried out without wearing the protective equipment, the worker and a third person is exposed to the risk of safety accidents during the welding work process of the pipe by the welding spark generated during the welding. There was also a problem.

The present invention has been proposed in order to solve the problems in the prior art as described above, and has an automatic welding device for automatically welding both end circumferences of the pipe automatically welding the circumference of the both ends of the pipe by the automatic welding device The purpose is to make it.

In addition, the present invention is not only easier and easier welding work for joining the both ends of the pipe by the automatic welding device, but also the welding site is constant, reducing the defective rate of the product as well as improving the work efficiency according to the fast welding work and The purpose is to prevent accidents in advance.

The present invention for achieving the object as described above, in welding the circumference of the pipe both ends, the base frame is installed on the bottom, the first rotation coupled to the upper side of the base frame to generate a rotational force by the drive unit A second rotation unit having a unit, a rotation control unit coupled to an upper side of the base frame, which is a position corresponding to the first rotation unit, to adjust a rotation direction and a rotation speed transmitted from the first rotation unit; A jig base axially coupled to each of the first and second rotary units to fix the pipe, an automatic welding part installed on the base frame to automatically weld the circumferential ends of the pipe, and installed on the base frame. It is composed of dust cover to collect sludge generated when welding pipe A circumferential automatic welding device at both ends of the pipe is provided.

In addition, the present invention, the jig base is installed on both sides of the jig base, respectively, coupled to each of the first and second rotation units, so that the jig base is rotated by the rotational force of each of the first and second rotation units. It consists of a rotating shaft portion, a welding groove portion formed on one side of the jig base to be positioned both ends of the pipe to be welded, and a plurality of clamps coupled to the upper surface of the jig base to fix the pipe to be processed on the jig base A circumferential automatic welding device for a pipe is provided.

In addition, the present invention is an automatic welding part, the welder is positioned at both ends of the pipe to weld both ends of the pipe fixed to the jig base, and coupled to the front of the base frame and the lower part of the welder is fixed to the welder An automatic circumferential welding device for a pipe is provided, characterized in that it consists of a welding control unit for adjusting the operation of the pipe.

In addition, the present invention, the drive unit is coupled to the base frame to be positioned below the first rotation unit, the drive motor is generated by the external power source and the drive motor is coupled to the drive motor is rotated by the drive force of the drive motor A shaft sprocket which is rotatably coupled to the first rotation unit and is connected to the shaft sprocket by a chain, and a chain tension unit coupled to the base frame to adjust the tension of the chain. An automatic circumferential welding device for pipes is provided.

In addition, the present invention, the rotation control unit for adjusting the rotational direction and the rotational speed transmitted from the first rotation unit is installed in the second rotation unit and coupled to the rotation axis of the jig base is rotated in accordance with the rotation direction of the jig base A rotation direction limit switch coupled to the rotation direction control block and a base frame which is one side of the rotation direction control block to sense the rotation direction of the rotation direction control block and to adjust the rotation direction of the jig base according to the detected signal. And a rotational speed adjusting block installed in the second rotation unit and axially coupled to the rotating shaft of the jig base and rotating together with the jig base, and coupled to a base frame that is one side of the rotational speed adjusting block. Detect the rotational speed of the control block and adjust the rotational speed of the jig base according to the detected signal Around the circumference of the pipe automatic welding device, characterized by consisting of a speed limit switch is provided.

In addition, the present invention, in order to block the sludge generated when welding the pipe to the outside of the automatic welding device, a barrier film frame coupled to the front of the base frame, and the first bearing is coupled to both sides of the barrier film frame, respectively Kid, and the bobbin is installed on the upper side of the barrier film frame, both sides are rotatably coupled to each of the first bearing kit, and the barrier film is installed on the bobbin wound or unrolled in accordance with the rotation of the bobbin, and A chain connecting a second bearing kit coupled to one side of the barrier film frame, a chain gear coupled to one of the first bearing kits among the first bearing kits, and a chain gear coupled to the second bearing kit; Blocking barrier consisting of a working cylinder coupled to the base frame and the shaft is coupled to the chain to move the chain up and down A circumferential automatic welding device for a pipe is provided which further comprises a tooth.

According to the present invention made as described above, by providing a structure for rotating the pipe to automatically weld the circumferential end of the bent pipe and an automatic welding device equipped with a welding machine, when the pipe is welded at both ends of the pipe As the welding machine of the automatic welding device is rotated at the same time as the rotating machine, the welding work for welding the circumferences of the pipe ends is very easy and convenient.

In addition, since the welded portion of the pipe is constantly formed by automatically welding the circumference of both ends of the pipe, the defective rate of the product is lowered as well as the quality of the product is improved.

In addition, since the welding work is performed by the automatic welding device in a short time, it is possible to reduce the working time and manpower loss according to the welding work of the pipe as well as to reduce the product cost and labor cost by welding a large amount of pipe. Work efficiency is also improved by making a large amount of pipes.

On the other hand, by installing the barrier film device in the automatic welding device, the welding spark generated when welding the pipe by the barrier film device is prevented from scattering to the outside of the automatic welding device, the worker and the third party is a safety accident It is also effective in preventing safety accidents caused by welding of the pipe, such as protection from danger.

Hereinafter, a device for automatically welding a circumference of a pipe according to the present invention will be described in detail with reference to FIGS. 1 to 7F.

1 is a perspective view showing an automatic circumferential welding device of the pipe of the present invention, Figure 2 is a perspective view showing a state in which the blocking device is coupled to the automatic circumferential welding device of the pipe of the present invention, Figure 3 is an automatic circumferential welding device of the pipe of the present invention 4 is an exploded perspective view showing the separated state, Figure 4 is a front view showing the circumferential automatic welding device of the present invention pipe from the front, Figure 5 is a side view showing the circumferential automatic welding device of the present invention pipe from the side, Figure 6 7A to 7F are plan views showing the state in which both ends of the pipe are welded by the circumferential automatic welding device of the pipe of the present invention.

The present invention is provided with an automatic welding device 100 for automatically welding both ends of the pipe 60, which is a metal product used as a seat frame for an automobile or used in an industrial field.

As shown in FIG. 1, the automatic welding device 100 includes a base frame 10, a jig base 20, a first rotating unit 30, a second rotating unit 40, and an automatic welding unit 50. It is largely composed.

The base frame 10 is located at the bottom of the automatic welding device 100 is fixed to the bottom, the base frame 10 is coupled to the various devices of the automatic welding device 100 as well as the automatic welding device Support 100.

In addition, first and second rotation units 30 and 40 are installed at both upper sides of the base frame 10, respectively.

That is, the first rotation unit 30 is coupled to the upper one side of the base frame 10, and the first rotation unit 30 above the first rotation unit 30 to protect the first rotation unit 30 from external shocks. And a cover 32 surrounding the first rotation unit 30 to prevent foreign substances from entering.

The second rotary unit 40 is coupled to the other side of the upper part of the base frame 10, which is a position corresponding to the first rotary unit 30, and above the second rotary unit 40. A cover 42 is provided to surround the second rotary unit 40 to protect the second rotary unit 40 from external shocks and to prevent foreign substances from entering.

The first and second rotary units 30 and 40 are axially coupled to each other so that the jig base 20 to which the pipe 60 is fixed is rotatable.

As shown in FIG. 3, the jig base 20 is axially coupled to each of the first and second rotary units 30 and 40 on both sides of the jig base 20, respectively. Rotating shaft portions 21 are provided to rotate the jig base 10 by the rotational force of 30 and 40, respectively.

In addition, both ends of the pipe 60 to be welded are located at one side of the jig base 20, as well as a welding groove part at which the discharge side of the automatic welding part 50 welding the circumferential edges of the pipe 60 is located. (22) is formed.

A plurality of clamps 23 are coupled to the upper surface of the jig base 20 to hold the outer surface of the pipe 60 to fix the pipe 60 to be processed and welded to the upper surface of the jig base 20. However, the clamps 23 may be formed and provided in any form as long as they hold the outer surface of the pipe 60.

The upper surface of the jig base 20 is provided with a plurality of positioning members 24 for holding the position of the pipe 60 is fixed to the jig base 20.

The rotational force is generated by the driving force generated and transmitted from the first rotation unit 30 by the driving unit 31, and the second rotation unit 40 is generated by the rotational force transmitted from the first rotation unit 30. Will rotate.

As shown in FIG. 3, the driving unit 31 installed below the first rotation unit 30 is positioned below the first rotation unit 30 to generate a driving force by power applied from the outside. The motor 311 is coupled to the base frame 10, and the shaft sprocket 312 which is rotated by the driving force of the driving motor 311 is axially coupled to the driving motor 311.

In addition, a chain sprocket connected to the first rotation unit 30 by the shaft sprocket 312 and the chain 314 to transfer the driving force of the driving motor 311 to the first rotation unit 30. 313 is rotatably coupled to the base frame 10, the chain tension portion (3) positioned between the shaft sprocket 312 and the chain sprocket 313 to adjust the tension of the chain 314 ( 315) is combined.

On the other hand, the second rotation unit 40 is a jig base that is fixed to the rotation direction and rotation speed of the rotational force transmitted from the first rotation unit 30 to the second rotation unit 40, that is, the pipe 60 is fixed Rotation control portion 41 for adjusting the rotational direction and rotational speed of the 20 is provided.

As shown in FIG. 3, the rotation controller 41 is axially coupled to the rotation shaft 21 of the jig base 20 in the second rotation unit 40 as well as the rotation of the jig base 20. Rotating direction control block 411 is installed to rotate along the direction, one side of the rotation direction control block 411 detects the rotation direction of the rotation direction control block 411, that is, jig base 20 Of course, the rotation direction limit switch 412 to adjust the rotation direction of the jig base 10 according to the detected signal is coupled to the base frame 10.

In addition, the second rotation unit 40 is provided with a rotation speed control block 413 that is axially coupled to the rotation shaft portion 21 of the jig base 20 and rotates at the same speed as the jig base 20. In addition, one side of the rotation speed control block 413 detects the rotation speed of the rotation speed control block 413 as well as the rotation speed to adjust the rotation speed of the jig base 10 according to the detected signal The limit switch 414 is coupled to the base frame 10.

The signals sensed by the rotation direction limit switch 412 and the rotation speed limit switch 414 are sent to a control unit (not shown), and the control unit sends the signal to the driving motor 311 and sends the drive motor 311. Drive force, that is, rotation direction and rotation speed.

The automatic welding part 50 installed in the base frame 10 to automatically weld the circumferential ends of the pipe 60 is a pipe fixed to the jig base 20, as shown in FIGS. 1 and 3. A welding machine 51 is provided to weld both ends of the end portion 60, and the end of the welding machine 51, that is, the discharge side, is fixed to the welding groove portion 22 side of the jig base 20 and rotates. Both ends of the pipe 60 which are rotated together by the jig base 20 are welded.

When the jig base 20 is rotated to fix the lower part of the welder 51 to the lower part of the welder 51 as well as to control the operation of the welder 51, that is, to weld both end circumferences of the pipe 60. The welding machine is operated when the welding machine 51 is operated and welding of both ends of the pipe 60 is completed or the jig base 20 is not rotated to fix the new pipe 60 to the jig base 20. A welding control unit 52 that controls the operation of the welder 51 so as not to operate 51 is coupled to the front surface of the base frame 10.

On the rear surface of the base frame 10 is a dust cover 70 for storing the sludge generated when welding the pipe 60 fixed to the jig base 20 by the automatic welding unit 50 to collect It is installed.

On the other hand, the automatic welding portion 50 is provided with a blocking film device 80 to block the sludge generated when welding the circumferential end of the pipe 60 to the outside of the automatic welding device 100.

As shown in FIG. 2 and FIG. 3, the blocking film device 80 has a blocking film frame 81 coupled to a front surface of the base frame 10, and a first bearing kit on both sides of the blocking film frame 81. Each of the first bearing kits 82 is coupled to each other, and the first chain gear 83 is rotatably axially coupled to any one of the first bearing kits 82.

The second bearing kit 86 is coupled to one side of the barrier film frame 81, and the second chain gear 87 is rotatably coupled to the second blade bearing 86.

In addition, the upper side of the barrier film frame 81 is provided with a bobbin 84, both sides rotatably axially coupled to each of the first bearing kit 82, and the pipe (84) on the bobbin 84 In order to prevent the sludge generated during welding of the scattering to the outside of the automatic welding device 100 is provided with a blocking film 85 that is wound or unwinded in accordance with the rotation of the bobbing (84).

The first chain gear 83 coupled to the first bearing kit 82 of the first bearing kid 82 and the second chain gear 87 coupled to the second bearing kid 86 are mutually provided. A chain 88 is installed to allow the first chain gear 83 and the second chain gear 87 to rotate together.

The base frame 10 has a shaft portion of an operation cylinder 89 for moving the chain 88 up and down to rotate the chain gears 83 and 87 to wind or unwind the blocking film 85. 88, the shaft portion of the working cylinder (89) is coupled to a predetermined position of the chain 88, that is, a position such that the blocking film 85 is sufficiently wound or released by the rotation of the bobbin 84. .

Various devices of the automatic welding device 100, that is, the driving motors 311 of the first and second rotary units 30 and 40 and the driving unit 31, the limit switches 412 and 414, the automatic welding unit 50, and the blocking film. The operating state of each device such as the device 80 is controlled and controlled by a controller (not shown) installed outside the automatic welding device 100.

Referring to the operation of the present invention configured as described above are as follows.

First, the pipe 60 to be welded to the jig base 20 of the automatic welding device 100 is fixedly installed, that is, both ends of the bent pipe 60 are welded to the welding groove 22 of the jig base 20. The pipe 60 is placed above the jig base 20 so as to be positioned.

Then, when the position of the pipe 60 is determined by the respective positioning members 24 of the jig base 20, each clamp 23 of the jig base 20 holds the outer surface of the pipe 60. On the main surface, the pipe 60 is fixedly installed on the jig base 20.

In this state, when the operation switch of the control unit (not shown) is operated, the control signal generated by the control unit is sent to each device of the automatic welding device 100 to operate the above devices.

That is, the rotation force for rotating the jig base 20 is generated in the first and second rotation units 30 and 40 coupled to the base frame 10, and the circumferences at both ends of the pipe 60 in the automatic welding part 50 are generated. A welding flame for welding is generated, and at the same time, the blocking film 85 is unfolded in the blocking film device 80 to prevent the welding spark from flying out of the automatic welding device 100.

Here, when the operation state for each of the above configuration is described, the drive motor 311 of the drive unit 31 installed in the lower portion of the first rotation unit 30 in accordance with the signal sent from the control unit is driven, the drive motor As the shaft of the motor 311 is rotated by the driving force of the 311, the shaft sprocket 312 axially coupled to the driving motor 311 is rotated and simultaneously connected to the shaft sprocket 312 and the chain 314. The chain sprocket 313 is also rotated.

The rotation force is generated in the first rotation unit 30 by the rotation of the chain sprocket 313.

At this time, between the first rotary unit 30 and the second rotary unit 40, a jig base 20 in which a pipe 60 to be welded is fixed is installed and coupled to both side surfaces of the jig base 20. Since the rotary shaft portion 41 is rotatably coupled to each of the rotary units 30 and 40, the jig base 20 is rotated by the rotational force of the first rotary unit 30, and the jig base ( Rotation force is also generated in the second rotation unit 40 to which the rotation shaft portion 40 of the 20 is coupled.

The rotation direction and the rotational speed of the jig base 20 rotated by the first and second rotation units 30 and 40 are controlled and detected by the rotation control unit 41 provided in the second rotation unit 40. do.

That is, like the rotating jig base 20, the rotation direction control block 411 and the rotation speed control block 413 of the rotation control unit 41 are rotated, and the rotation direction of the rotation direction control block 411 is rotated. Is detected by the rotation direction limit switch 412 and the rotation speed limit switch 414 detects the rotation speed of the rotation speed control block 413.

When the rotation direction and the rotation speed detected by each of the limit switches 412 and 414 are out of a predetermined setting range, the detected signal is sent to the control unit, and in the control unit, the jig base 20 operates in the rotation direction and the rotation speed within the setting range. Since the driving motor 311 is controlled to rotate, the jig base 20 is rotated while the rotation direction and the rotation speed are adjusted within a predetermined setting range.

Meanwhile, as the jig base 20 is rotated, a welding flame for welding the pipe 60 is generated in the automatic welding part 50.

That is, a welding flame is generated in the welding machine 51 having a lower portion fixed to the welding control unit 52 of the automatic welding unit 50 according to a signal sent from the controller, and an end of the welding machine 51, that is, the welding flame comes out. The discharge side of the welder 51 is located in the welding groove portion 22 of the jig base 20 at which both ends of the pipe 60 are located, so that the welder 51 rotates together with the jig base 20. Welding is carried out along the circumference of both ends of 60).

At this time, the welding control unit 52 operates the welder 51 when the jig base 20 rotates to weld the circumferential ends of the pipe 60, and the jig base 20 does not rotate or In the state where the welding of the pipe 60 is completed and the jig base 20 is stopped, the operating state of the welder 51 is adjusted so that the welder 51 does not operate.

In addition, when the jig base 20 is rotated and the automatic welding unit 50 is operated at the same time, the sludge generated during welding is prevented from being scattered to the outside of the automatic welding device 100 by being installed at the front of the base frame 10. Blocking device 80 is also operated at the same time.

That is, as the operation cylinder 89 of the blocking device 80 is operated according to a signal sent from the controller, the shaft portion of the operation cylinder 89 is reciprocated up and down, and the shaft portion of the operation cylinder 89 is chained. Coupled to (88), the chain 88 also reciprocates up and down along the reciprocating shaft portion.

As the first chain gear 83 of the first bearing kit 82 coupled to the blocking film frame 81 rotates as the chain 88 reciprocates, the second chain gear of the second bearing kit 86 is rotated. 87) is also rotated.

At this time, both sides of the bobbin 84 wound around the blocking film 85 are rotatably coupled to the first bearing kit 82 respectively coupled to both sides of the blocking film frame 81 so that the first chain gear ( The bobbin 84 is also rotated by the rotational force generated by the rotation of the 83 to wind or unwind the blocking film 85 from the bobbin 84.

That is, in the state in which the automatic welding device 100 is stopped, the blocking film 85 is wound around the bobbin 84. When the automatic welding device 100 is operated, the blocking film 85 is released from the bobbin 84 while the automatic welding device 100 is operated. As the front surface of the automatic welding device 100 is blocked, welding sparks and sludge generated during welding are prevented from being scattered to the outside of the automatic welding device 100.

Here, once again to briefly explain the operating state of the automatic welding device 100, after the pipe 60 to be fixed to the jig base 20 of the automatic welding device 100 is fixed to the automatic When the welding device 100 is operated, the control unit sends a control signal to each device.

Then, the jig base 20 is rotated in the same shape as in FIGS. 7A to 7E by the driving unit 31 according to the control signal of the controller, and a welding flame is formed in the welding machine 51 of the automatic welding unit 50. As it occurs, the both ends of the pipe 60 are welded, and at the same time, the blocking film 85 of the blocking device 80 is released from the bobbin 84 to block the front surface of the automatic welding device 100.

When welding of both ends of the pipe 60 is completed, the control signal is transmitted from the control unit to each device, and the devices operate in reverse operation as described above.

That is, the reverse rotational force is generated in the drive unit 31, the jig base 20 is rotated in the reverse direction to return to the original position, the operation of the welding machine 51 of the automatic welding unit 50 is stopped and the blocking film 53 ) Is wound on the bobbin 84 so that the work is organized (FIG. 7F).

As described above, the automatic circumferential welding device for the pipe according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings described herein, and by those skilled in the art within the technical scope of the present invention. Various modifications may be made and thus should not be individually understood from the technical spirit or the prospect of the present invention.

1 is a perspective view showing an automatic circumference welding device of the present invention pipe.

Figure 2 is a perspective view showing a state in which the blocking film device is coupled to the automatic circumference welding device of the present invention pipe.

Figure 3 is an exploded perspective view showing the automatic circumference welding device of the present invention in a separated state.

Figure 4 is a front view showing a circumferential automatic welding device of the present invention pipe from the front.

Figure 5 is a side view showing a circumferential automatic welding device of the present invention pipe from the side.

Figure 6 is a plan view showing a circumferential automatic welding device of the present invention pipe in a plane.

7a to 7f is a use state diagram showing the state in which both ends of the pipe is welded by the automatic circumferential automatic welding device of the present invention pipe.

Explanation of symbols on the main parts of the drawings

10: baseframe 20; Jig base

21: rotating shaft 22: welding groove

30: first rotation unit 31: drive unit

40: second rotation unit 41: rotation control unit

50: automatic welding part 51: welding machine

52: welding control unit 60: pipe

70: dust cover 80: blocking film device

100: automatic welding device

Claims (6)

In welding the circumference of the pipe both ends, Base frame installed on the floor, A first rotation unit coupled to an upper side of the base frame to generate rotational force by a driving unit; A second rotary unit coupled to the other upper portion of the base frame, which is a position corresponding to the first rotary unit, and having a rotation controller for controlling a rotation direction and a rotation speed transmitted from the first rotary unit; A jig base axially coupled to each of the first and second rotary units to fix the pipe; An automatic welding part installed on the base frame to automatically weld both ends of the pipe; Is installed on the base frame automatic welding device for the circumference of the pipe, characterized in that composed of a dust cover to collect the sludge generated when welding the pipe. The method of claim 1, On the jig base, Rotating shaft parts which are installed on both sides of the jig base and axially coupled to each of the first and second rotation units, respectively, to rotate the jig base by the rotational force of the first and second rotation units, A welding groove part formed at one side of the jig base and having both ends of a pipe to be welded; Automated circumference welding device for pipes, characterized in that composed of a plurality of clamps coupled to the upper surface of the jig base to fix the pipe to be processed on the jig base. The method of claim 1, Automatic welding part, A welding machine having end portions at both ends of the pipe to weld both ends of the pipe fixed to the jig base; Coupled to the front of the base frame and the lower portion of the welder is fixed to the automatic circumference welding device of the pipe, characterized in that composed of a welding control unit for adjusting the operation of the welder. The method of claim 1, The drive unit, A driving motor coupled to the base frame so as to be positioned below the first rotating unit to generate driving force by an external power source; An axis sprocket axially coupled to the drive motor and rotating by a driving force of the drive motor; A chain sprocket coupled to the first rotating unit and connected by the shaft sprocket and the chain; Automatic circumference welding device of the pipe, characterized in that composed of a chain tensioning portion coupled to the base frame to adjust the tension of the chain. The method of claim 1, Rotation control unit for adjusting the rotation direction and the rotation speed transmitted from the first rotation unit, A rotation direction control block installed on the second rotation unit and coupled to the rotation shaft of the jig base and rotating according to the rotation direction of the jig base; A rotation direction limit switch coupled to the base frame on one side of the rotation direction control block to sense the rotation direction of the rotation direction control block and to adjust the rotation direction of the jig base according to the detected signal; A rotational speed adjusting block installed at the second rotation unit and coupled to the rotation shaft of the jig base to rotate together with the jig base; A pipe which is coupled to the base frame which is one side of the rotational speed control block and configured to detect the rotational speed of the rotational speed control block and adjust the rotational speed of the jig base according to the detected signal. Circumferential automatic welding device. The method of claim 1, In order to block the sludge generated when welding the pipe to the outside of the automatic welding device, a barrier frame coupled to the front of the base frame, a first bearing kit coupled to both sides of the barrier frame, and the barrier film A bobbin installed on the upper side of the frame and rotatably coupled to each of the first bearing kits on both sides thereof, a barrier film installed on the bobbin and wound or unrolled according to the rotation of the bobbin, and on one side of the barrier film frame. And a chain connecting the second bearing kit to be coupled, the chain gear coupled to any one of the first bearing kits, and the chain gear coupled to the second bearing kit, and the base frame coupled thereto. It is further included that the blocking device is made of a working cylinder for moving the chain up and down the shaft portion is coupled to the chain together Automatic welding apparatus according to the circumference of the pipe gong.

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