KR100898720B1 - Method for constructing of jointing steel pipes, using automatic TIG-welding device of portable type - Google Patents

Abstract

Steel pipe connection construction method including a portable type TIG automatic welding equipment according to the present invention, by forming both of the steel pipes to be interconnected by using both the forming machine of the steel pipe forming joint device, and to align both sides of the steel pipe to be mutually aligned. After that, remove the orthopedic joint from the steel pipe and install the automatic welding device on one of the steel pipes, and select one of the single body type automatic welding device and the portable type automatic welding device according to the conditions of the welding space of the steel pipe. Next, by connecting the steel pipe by welding the circumference of the steel pipe, even if it is difficult to apply a single body type automatic welding device such as a narrow construction section or a curved pipe installation section, the piping construction work can be performed more easily, and thus the welding quality This can improve the reliability of the pipe work.

Orthopedic Fittings, Bends, Portable, Travel Rails, Welders, Molding Machines

Description

Method for constructing of jointing steel pipes, using automatic TIG-welding device of portable type}

The present invention relates to a steel pipe connection construction method, in particular in a large construction space using a single-body type automatic welding device, in the case of narrow construction space or curved pipe construction using a portable type automatic welding device to perform the piping work The present invention relates to a steel pipe connection construction method including a portable type TIG automatic welding equipment.

Applicant has developed and filed a patent application for "Steel Pipe Construction Method" to automatically perform piping and welding when constructing large steel pipes larger than 600mm to improve workability, economic efficiency and safety. Has been patented.

In addition, the present applicant can butt weld small diameter steel pipes having a diameter of about 500 mm, which are used in a waste transportation pipe, with a Tungsten inert gas welding (TIG) welder to more precisely weld the steel pipe joint to improve weldability. TIG) developed the automatic welding device and method, and applied for a patent, and was also patented by the Korean Patent Office under the registration number 10-739104.

Herein, with reference to FIGS. 1 to 6, the patent invention of Patent No. 10-739104 will be briefly described.

As shown in Figure 1, by using both forming machines (1A, 1B) of the steel pipe shaping device 1 to form both of the steel pipes (P) to be interconnected, and are aligned side by side to allow butt welding. At this time, the mutually opposite ends of both steel pipes have a structure chamfered to allow butt TIG welding.

Next, as shown in Figure 2, by using the traction device (3) to pull one steel pipe toward the other steel pipe to align the two steel pipes to be in a mutually facing state.

Next, as shown in the front view of FIG. 3, the step between the two steel pipes (P) is fine while rotating the fine adjustment bolt (4a) of the shaping adjustment mechanism 4 with a tool such as a spanner Adjust

Next, as shown in FIG. 4, temporary welding (GW) is performed at a predetermined interval in several places of a welding site using a general manual gas welding machine.

Next, the orthopedic joint 1 is separated from both steel pipes, and as shown in FIG. 5, a single body type automatic welding device 5 is installed around one steel pipe, and then the welding robot 6 is connected to the steel pipe. Butt welding is performed by TIG welding while moving along the circumference.

When the welding (TW) of the steel pipe connecting portion is completed in the above manner, as shown in FIG. 6, the welding material is filled in a portion where the two steel pipes P are butted together, and then cooled, so that both steel pipes can be interconnected with sufficient joint strength. do.

However, in the above-described patent invention, additional work to secure space when welding steel pipes using the single body type automatic welding device as described above in the piping construction site conditions, that is, the construction site is narrow or there are obstacles. This is required, there is a problem that takes a long time to mount the automatic welding device on the steel pipe.

Particularly, when a single body type automatic welding device having a substantial load is attached to one steel pipe in the curved pipe portion of the pipe, the eccentric load increases the level difference between the curved pipe joints of the steel pipe, butt welding works. This is not easy, and there is a problem that the cause of defects also increases.

In addition, in a narrow construction site, not only the arrangement of the auxiliary equipment required for the orthopedic joint or the automatic welding device is easy, but also there is a problem in that a faster and safer pipe construction work is limited.

The present invention has been made in order to solve the above problems, the pipe construction work in a narrow section or bent pipe installation section is configured to selectively use a single body type or portable type automatic welding device according to the piping construction site conditions It is an object of the present invention to provide a method for connecting steel pipes including portable type TIG (TIG) automatic welding equipment that can be made more easily and also improves the quality of pipe connections.

In addition, the present invention, by mounting the mounting equipment equipped with the necessary equipment for connecting the steel pipe on the steel pipe under construction to support the steel pipe connection construction work, to increase the space utilization of the construction site, the portable type TIG can also improve the construction (TIG) Another purpose is to provide a method for connecting steel pipes, including automatic welding equipment.

Steel pipe connection construction method including a portable type TIG automatic welding equipment according to the present invention for realizing the above object has a circular body that is mounted around the steel pipe, the traveling rail is provided with a traveling rail Single body type automatic welding device configured to weld the steel pipe while moving the carriage and the welding machine along; The construction method is to connect the steel pipe by using the portable type automatic welding device, which is equipped with a traveling rail mounted right around the steel pipe, and equipped with a carriage and a welding machine, which moves along the traveling rail to weld the steel pipe. Shaping both steel pipes to be interconnected using both forming machines of and pulling the both steel pipes and arranging them to be in a mutually opposed state; After separating the orthopedic device from the steel pipe, the automatic welding device is mounted on one of the steel pipes, but when the steel pipe welding space is too small to mount the single body type automatic welding device, the portable welding device of the portable type Mounting and selecting one of the single body type automatic welding device and the portable type automatic welding device when the construction space is relatively large; The step of connecting the steel pipe by welding the circumference of the steel pipe using the automatic welding device mounted on the steel pipe in the step.

In addition, the steel pipe connection construction method including the portable automatic TIG (TIG) automatic welding equipment according to the present invention for realizing the above object has a circular body mounted around the steel pipe, the circular body is provided with a running rail A single body type automatic welding device configured to weld steel pipes while the carriage and the welder move along the traveling rails; The traveling rail is mounted around the steel pipe and is connected to the steel pipe by using a portable type automatic welding device configured to weld the steel pipe while the carriage and the welder move along the traveling rail. Shaping both steel pipes to be interconnected using a molding machine, and aligning the two steel pipes to be in a mutually facing state; After separating the orthopedic device from the steel pipe, the automatic welding device is mounted on one of the steel pipes. If the steel pipe connection part is a straight section, one of the single body type automatic welding device and the portable type automatic welding device is selected and mounted. If the steel pipe connection is a curved section, mounting the automatic welding device of the portable type; The step of connecting the steel pipe by welding the circumference of the steel pipe using the automatic welding device mounted on the steel pipe in the step.

On the other hand, the auxiliary equipment mounting device equipped with the supporting equipment necessary for the above-described orthopedic device, single body type automatic welding device, portable type automatic welding device is placed on the upper part of the steel pipe, and this auxiliary equipment mounting device and the orthopedic joint It is preferable that the steel pipe connection construction be made while the cable is connected to the apparatus or the automatic welding apparatus.

Steel pipe connection construction method including a portable type TIG automatic welding equipment according to the present invention configured as described above, is configured to be able to selectively use a single body type or portable type automatic welding device according to the piping construction site conditions Therefore, even when it is difficult to apply a single body type automatic welding device such as a narrow construction section or a curved pipe installation section, there is an effect that the piping construction work can be performed more easily.

In addition, the present invention is to improve the welding quality by using a portable type automatic welding device when the step difference occurs in the steel pipe connection due to the curved pipe installation section or the load of the welding equipment to improve the reliability of the pipe connection work have.

In addition, the present invention is because it is configured to directly support the steel pipe connection construction work mounted on the mounting equipment equipped with the necessary equipment for connecting the steel pipe on the steel pipe under construction to increase the space utilization of the construction site, and also improve the workability There is also.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

Prior to describing the steel pipe connection construction method including the portable equipment according to the present invention, the automatic welding device for connecting the steel pipe according to the present invention will be divided into two types.

That is, with reference to FIGS. 7 to 17, a portable type automatic welding device PW according to the present invention will be described, and with reference to FIGS. 18 to 22, a single body type automatic welding device according to the present invention ( SW) is demonstrated.

In the automatic welding device according to the present invention, the two steel pipes to be connected are welded to each other using a steel pipe orthopedic fitting (JR in FIG. 24), and then welded to each other, and the connection parts of both steel pipes P are completely connected. It is an apparatus for doing this.

First, a portable type automatic welding device PW according to the present invention will be described with reference to FIGS. 7 to 17.

7 and 8 are a perspective view and an enlarged view of the main portion of the portable type automatic welding apparatus according to the present invention mounted on the circumference of the steel pipe, Figures 9 to 11 is a front view of the portable type automatic welding apparatus according to the present invention Fig., Side view and plan view. 12 is a view illustrating a state in which a travel body is mounted on the travel rail of the present invention.

In the portable type automatic welding device PW, referring to FIG. 7, a traveling rail 110 is installed in a circular ring structure around one steel pipe P, and the carriage moves along the traveling rail 110. The welding machine 300 is provided in the 200, and it is comprised so that the connection part of both steel pipes may be welded.

The traveling rail 110 constitutes a traveling rail assembly 100 which will be described below, with reference to the traveling rail assembly 100.

The traveling rail assembly 100 includes a traveling rail 110 having a long plate shape, and a spike 120 for fixing the traveling rail 110 to the periphery of the steel pipe P.

The traveling rail 110 is formed in a divided structure to be mounted around the steel pipe P. In the drawings of the present embodiment, a two-split structure is illustrated.

The divided part includes a rail assembly 130 for assembling or separating the divided traveling rails 110 from each other.

The rail assembly 130 is mutually connected by the connecting member 133 fastened through both of the assembling blocks 131 in a state in which the assembling blocks 131 are respectively installed at the ends of the divided traveling rails 110. By being fixed, the divided traveling rails 110 are assembled to each other to have an integral ring structure.

Of course, when disassembling the running rail 110, when the connection member 133 is released in the opposite manner, both of the assembling blocks 131 are separated and the running rail 110 is divided.

The spike 120 is a portion for mounting and fixing the traveling rail 110 around the steel pipe (P), and the boss body 121 is fixed to the inner surface of the traveling rail 110 through a fixing bolt 125 and , In the state of being fixed to the end of the boss body 121 is made of a close contact plate 123 in close contact with the outer surface of the steel pipe (P).

The boss body 121 is preferably made of a material such as synthetic resin having a certain elastic force, the contact plate 123 is preferably made of the same material or metal member as the steel pipe. This is because the close contact plate 123 is made of a metal member has a strong adhesion around the steel pipe, the boss body 121 is to provide a constant degree of elastic force when the close contact plate 123 is in close contact with the steel pipe will be. Of course, the close contact plate 123 may be configured of a hard synthetic resin plate.

The spike 120 may be in close contact or spaced apart from the circumferential surface of the steel pipe (P) by moving in a radial direction through fastening or loosening the fixing bolt 125 penetrated from the outer surface of the running rail (110). .

Now, the configuration of the traveling rail 110 will be described in detail.

The running rail 110 according to the present invention is formed to support the carriage 200 and the welder 300 in a stable state, and is formed in a long plate structure, and the inner and outer circumferential surfaces of both sides of the plate are All are inclined.

That is, the inclined surfaces 111 are formed such that four corners positioned at both sides of the travel rail 110 are chamfered, so that the rollers 213 of the carriage 200 to be described later can move while contacting. do.

The driving gear 110 is coupled to the driving gear 219 of the carriage 200 to form a gear tooth 115 that allows the carriage 200 to rotate along the traveling rail 110.

Gear tooth 115 is preferably formed on one side of the running rail 110, if necessary, formed of a material different from the running rail 110 is installed in a structure fixed to the side of the running rail (110) It is also possible. The reason why the gear teeth 115 are formed of different materials and coupled to the traveling rail 110 is to ensure that the gear teeth 115 are not easily worn during the driving of the carriage 200 and thus maintain a long life. will be.

Next, the carriage 200 that rotates around the steel pipe along the traveling rail 110 as described above will be described.

The carriage 200 according to the present invention is configured to stably travel along the traveling rail 110 and is configured to adjust the welding position back and forth and up and down while supporting the welder 300.

10 and 11, the carriage 200 is composed of a traveling body 210, a mounting unit 230, and a welder adjusting unit 250. Each configuration will be described.

First, the driving body 210 will be described with reference to FIG. 12.

The traveling body 210 includes a traveling body 211 constituting a body and a plurality of traveling rollers 213 installed on the traveling body 211 and closely contacting both inclined surfaces 111 of the traveling rail 110. It consists of.

The traveling body 211 has roller mounting portions 212 erected vertically on both sides thereof, and the traveling rollers 213 are rotatably installed inside the roller mounting portions 212. In this case, it is preferable that the traveling rollers 213 are provided with four pairs of rollers, two pairs at the front and two pairs at the rear in the moving direction of the carriage 200.

In the traveling body 211, among the traveling rollers 213, rollers which are in close contact with one side of the traveling rail 110 are linearly adjusted to adjust the degree of adhesion, or the carriage 200 is detached from the traveling rail 110. The roller adjuster 215 is configured to be.

The roller adjuster 215 may be configured as an adjustment knob made of a screw coupling structure to the travel body 211 outside the roller mounting portion 212 on one side (right in the drawing) of the travel body 211.

A travel motor 217 is formed on the top of the travel body 210 to generate a driving force. In this embodiment, the mounting plate 231 is installed on the upper surface of the travel body 211. The travel motor 217 is installed at the top of the.

A driving gear 219 meshed with the gear tooth 115 of the traveling rail 110 is installed inside the traveling body 211, and the carriage 200 moves while the driving force of the traveling motor 217 is rotated. And configured to move along 110. Of course, a power transmission means is connected between the driving motor 217 and the driving gear 219 so as to transmit rotational power. The power transmission means includes a speed reducer 221, a mounting plate 231, and a traveling body 211. It consists of a drive shaft 223 installed through.

Next, the mounting unit 230 will be mainly described with reference to FIGS. 10 and 11.

The mounting part 230 is largely comprised of a mounting plate 231, a control box 235 provided thereon, a wire feeding device 240, and the like.

Mounting plate 231 is fixedly installed on the upper portion of the traveling body 211, while both sides are inclined in the direction of the steel pipe so as to secure a sufficient mounting area on the upper portion to reduce the mounting height from the center of the steel pipe (P) as much as possible It is made of a bent structure.

 That is, in the mounting plate 231, with reference to FIG. 9, a horizontal plate 232 is positioned at the center portion, and the wing plate 233 inclined in the circumferential direction of the steel pipe on both sides of the horizontal plate 232. ) Is located.

The horizontal plate 232 is provided with a vertical leveling device, and both wing plates 233 are provided with a control box 235 and a wire feeder 240, respectively.

Here, the control box 235 and the wire feeder 240 installed on the wing plate 233 will be described.

The control box 235 is a part composed of circuits for controlling the overall welding operation, the moving speed of the carriage 200, the feeding speed of the wire, the position adjustment of the welder 300, the power supply of the welder 300, etc. It is configured to control various elements that need to be controlled.

The control box 235 may constitute some control part in the box itself, and the other control part may be configured through a separate control box. The configuration of the regulator box 310 will be described again below.

The wire feeding device 240 is a feeding roller 243 on which the welding wire 241 is wound, and a feeding supply for supplying a supply force to supply the welding wire 241 to the welding machine 300 by the feeding roller 243. In order to supply the welding wire 241 to the motor 245, the feed regulator 247 for adjusting the supply speed of the welding wire 241, and the wire clamp 380 to be described later on the feed regulator 247 side. The feed cable 248 is connected to.

Next, the welder adjusting unit 250 will be described.

The welder adjusting unit 250 is installed to be supported on the horizontal plate 232 of the mounting plate 231, so that the position of the welding torch 370 of the welding machine 300 in the horizontal (front and rear) or vertical (vertical) direction. The horizontal adjuster 251 and the vertical adjuster 255 are configured to adjust the position.

The horizontal adjuster 251 and the vertical adjuster 255 use a linear motor to move the welder 300 horizontally (forward and backward lengthwise) or vertically (radially in the direction of the steel pipe) like a conventional position adjusting device. It may be configured to be moved to, but in the present embodiment, the horizontal adjustment unit 251 is configured to enable manual adjustment, the vertical adjustment unit 255 illustrates a configuration configured to enable automatic adjustment.

That is, the horizontal adjustment unit 251 is a pair of horizontal shaft 252 located in the horizontal direction on the upper portion of the mounting plate 231 is inserted into the guide bracket 253 fixed to the mounting plate 231 In the state, after adjusting the position of the front and rear direction to an appropriate length, and then using the fixing handle to fix the position fixing block 254, the position of the horizontal axis 252 is configured to be fixed. Of course, it is also possible to configure not only the manual method but also automatically adjust the horizontal position using a linear motor or the like.

The vertical adjustment unit 255 is configured to move the first support 258 in the vertical direction, that is, the vertical direction, the drive motor is installed in the vertical adjustment box 257 like a normal vertical position adjustment device, The first support 258 moves up and down by the driving force of the drive motor.

Of course, the vertical adjustment box 257 is fixedly installed in the vertical direction to the connection plate 256 connected to the horizontal adjustment unit 251, therein the drive motor, vertical guide shaft, gear or chain for vertical operation And the like.

Next, a welding machine 300 supported by the carriage 200 as described above and performing welding will be described.

The welder 300 will be described in order from the portion connected to the vertical adjuster 255, the first support 258, the adjuster box 310, the second support 320, the weaving actuator 330, and the fixing block 340. ), A rotating block 350, a torch clamp 360, a welding torch 370, a wire clamp 380, and the like.

The first support 258 is formed long in the left and right direction, it is preferably formed of a rod structure made of an insulating material.

In the middle portion of the first support 258, when the welding torch 370 rotates back and forth, a deleting unit 259 is formed so that interference does not occur. The size and depth of the eraser 259 may be appropriately set according to the shape of the welding torch 370.

One side of the first support 258 is provided with a regulator box 310, the regulator box 310 is configured to adjust the welding operation, weaving speed and the like.

The second support 320 is installed long in the front and rear direction from the bottom of the first support 258 to the upper and lower weaving operation unit 330 is configured.

The weaving motor 331 is installed on the upper portion of the second support 320, the weaving plate 333 to enable the weaving operation is installed on the lower portion.

That is, the weaving plate 333 is installed to allow relative movement with the second support 320 so that when the weaving motor 331 operates, the welding torch (sliding forward and backward from the second support 320) 370 is configured to enable weaving welding.

A fixing block 340 is installed below the weaving plate 333.

The rotating block 350 is installed on the side of the fixed block 340, the rotating block 350 is configured to be connected to be rotated in the front and rear direction from the fixed block 340.

The reason why the fixed block 340 and the rotation block 350 are installed to be rotatably connected to each other and a detailed structure thereof will be described below with reference to FIGS. 14 to 17.

The torch clamp 360 is installed in the rotation block 350, and the welding torch 370 is assembled in a structure inserted through the torch clamp 360 and the rotation block 350 up and down.

A cooling water passage for cooling the welding torch 370 during welding is formed inside the torch clamp 360, and a cable 361 for supplying power and cooling water to the welding torch 370 is connected. .

One side of the torch clamp 360 is provided with a wire clamp 380 for supporting the welding wire 241 provided from the wire feeder 240 and at the same time to guide the wire supplied to the end of the welding torch 370. .

In particular, the torch clamp 360 is rotatably installed in the rotation block 350 by 180 degrees, for the purpose of freely selecting and operating the welding direction in the clockwise or counterclockwise direction when welding the steel pipe.

Detailed description thereof will be described below with reference to FIGS. 14 to 17.

The welding torch 370 mounted on the torch clamp 360 is configured to enable the gas-tungsten arc welding method, that is, the TIG welding method, among the arc welding methods. It is configured to supply an inert gas (eg, argon gas) around the electrode, and is configured to melt and weld the welding wire 241 while generating an arc between the electrode and the welding portion during welding.

The torch clamp 380 is a component that supports to continuously supply the welding wire 241, that is, the solid wire (SOLID WIRE) to the welded portion of the steel pipe, it is possible to properly adjust the supply position of the welding wire. It is configured to be.

Now, the structure of the above-mentioned weaving operation unit 330 and the welding torch rotating structure will be described.

First, referring to FIG. 13, the weaving operation unit 330 will be described in detail.

Figure 13 is a side view for explaining the welder weaving structure of the present invention.

The second support 320 is connected to the weaving shaft 335 which repeatedly moves from side to side between the weaving motor 331 and the weaving plate 333 when viewed from the side.

Of course, the second support 320 is formed with a weaving hole 321 through which the weaving shaft 335 penetrates, and the weaving hole 321 is a slot formed long in the movement direction of the weaving shaft 335. It is preferable that it consists of a structure.

In the weaving motor 331, the weaving generating unit may be configured to repeatedly operate the weaving shaft 335, and the weaving generating unit may rotate according to the forward rotation or the reverse rotation of the weaving motor 331. Motor gear 337 and a rack 338 that moves left and right in accordance with the rotational movement of the motor gear 337. Of course, the rack 338 is fixed to the weaving shaft 335 is installed.

Here, the weaving motor 331 may be configured as a stepping motor capable of precise control by an inverter.

And it is preferable that a guide mechanism is installed between the second support 320 and the weaving plate to enable a stable sliding reciprocating motion.

As described above, the weaving operation unit 330 according to the present invention is configured to enable the weaving operation of the welding torch 370 by the reciprocating sliding motion, thereby implementing the steel pipe welding while implementing a stable weaving operation with a simple structure.

Next, with reference to FIG. 14 and FIG. 15, the back and forth rotational motion of a welding torch is demonstrated.

Figure 14 is an exploded perspective view for explaining the front and rear rotational motion of the welding torch in the present invention, Figure 15 is a cross-sectional view of the combined state of the two blocks seen in the direction of C-C of FIG.

As shown in these figures, the torch support is divided into a fixed block 340 and a rotating block 350, the fixed block 340 is installed fixed to the weaving plate 333, the rotating block 350 is configured to be coupled to the rotating shaft 353 to the fixed block 340 to rotate.

That is, a shaft hole 343 is formed inwardly from the side of the fixing block 340, the rotating block 350 is installed so that the rotating shaft 353 protrudes long, the rotating shaft 353 is the shaft hole 343 ), The rotation block 350 is assembled to the fixed block 340 in a fixed state by fixing its position with the detent knob 345 provided in the fixing block 340.

The reason why the rotation block 350 is configured to be rotatable from the fixed block 340 is that the rotation block 350 is replaced when the welding torch 370 inserted and installed in the vertical direction to the torch clamp 360 is replaced. ) To rotate the welding torch 370 more conveniently in a state of rotating 90 degrees forward from the fixing block 340.

Next, referring to FIGS. 14 to 17, the 180-degree left-right rotational motion of the welding torch 370 will be described.

16 and 17 is a front view of the main portion showing a rotating structure of the welding torch in the present invention.

In the present invention, the welding torch 370 is installed to enable a 180-degree rotational movement to the rotary block 350, which allows the vertical axis 363 provided in the torch clamp 360 to rotate on the rotary block 350. It is configured to be possible by installing in combination.

That is, when the torch clamp 360 is rotated in the left direction or the right direction while the vertical axis 363 of the torch clamp 360 is inserted into the rotation block 350, the wire clamp 380 is shown in FIG. 16. As shown in FIG. 17, the welding torch 370 moves to the left or the right.

This structure is, as shown in Figure 14 and 15, the detent coupling structure in a state that the vertical axis 363 of the torch clamp 360 is inserted into the torch hole 351 of the rotary block 350. The position is determined by the 180 degree phase difference.

That is, the detent ball 357 supported by the detent bolt 355 and the spring 356 is mounted in the torch hole 351, and a detent groove ( As the 364 is formed, the position of the welding torch 370 may be accurately determined.

On the other hand, the rotating block 350 is formed so that one portion is divided around the torch hole 351 is configured to firmly fix the torch clamp 360 by using a tightening bolt 358.

As described above, when welding the steel pipe as configured to rotate the torch clamp 360, the welding direction is set in the clockwise or counterclockwise direction of the steel pipe as shown in Figs. The welding torch and the wire clamp are rotated and positioned according to the direction so that welding can be freely performed in any direction of the steel pipe.

18 to 22, a single body type automatic welding device SW according to the present invention will be described.

18 is a perspective view showing a single body type automatic welding apparatus according to the present invention, Figure 19 is a detailed view of the main portion is shown a single body type automatic welding apparatus according to the present invention, Figure 20 is a single body type according to the present invention Front view of main part of automatic welding device.

Single body type automatic welding device (SW) according to the present invention is provided with a circular body 500 having a circular structure to be coupled around the steel pipe (P). The circular body consists of a semi-circular upper body 555 and quarter-shaped bodies 556 and 557 coupled to both sides of the upper body 555.

The upper body 555 is divided into a size of about 1/2 in a circular structure, the quarter-shaped body (556, 557) is divided into a size of approximately 1/4, a circular structure to hold the circumference of the steel pipe by being assembled together Will be achieved.

Between the upper body 555 and both quarter-shaped body (556,557) is provided with an opening and closing device (not shown) for adjusting the opening and closing state of the quarter-shaped body (556,557), the both quarter-shaped body (556,557) is in contact with each other The part is provided with a locking device 580 to prevent it from being opened while holding the steel pipe.

The circular body 550 is provided with an orthopedic device 590 so that the device of the present invention can be fixed around the steel pipe while adjusting the roundness of the steel pipe while the steel pipe is in close contact with the surface.

Two orthopedic devices 590 are installed in the upper body 555, one each installed in the quarter-shaped body (556, 557), each configuration is connected to a fixed cylinder fixed to the circular body 500, while moving linearly It consists of a shaping plate 593 in close contact with the outer surface of the steel pipe (P).

The welding apparatus SW of this invention comprised as mentioned above is equipped with the automatic welding part so that automatic welding of TIG (Tungsten inert gas welding) can be performed on the outer surface of the steel pipe P.

That is, the carriage 600 is mounted to the circular body 500 to support the welder 300, the welding running portion 510 protruding in a circular ring structure on one side of the circular body 500 is It is provided, and the carriage 600 is configured to be equipped with a carriage 600 to weld the outer surface of the steel pipe through the welder 300 while moving along the steel pipe circumference.

The welding traveling part 510, the carriage 600, and the welding machine 300 will be described in order.

First, the welding traveling part 510 is provided on a rail support plate 511 protruding in a ring-shaped structure on one side of the circular body 500, and is provided on the inner surface of the rail support plate 511 to the carriage 600 It is composed of a running rail 515 made to be moved accordingly.

The traveling rail 515 is formed in a plate structure having a predetermined width and is fixed to the rail support plate 511 by a rail fixing bolt 517.

Next, the carriage 600 rotating around the steel pipe along the traveling rail 515 as described above will be described.

The carriage 600 according to the present invention is configured to stably travel along the traveling rail 515 and is configured to adjust the welding position back and forth and up and down while supporting the welder 300.

The carriage 600 is largely composed of a traveling body 610, a frame 630, and a horizontal and vertical adjustment unit 650. Each configuration will be described.

First, the traveling body 610 will be described.

The travel body 610 is composed of a travel body 611 constituting the body and a plurality of travel rollers 613 provided on the travel body 611 to be in close contact with both sides of the travel rail 515.

The traveling rollers 613 are preferably provided with four pairs of rollers, two pairs in the front and two pairs in the rear in the moving direction of the carriage 600.

A driving motor 617 that generates driving driving force is installed below the driving body 610.

As described above, the plurality of travel rollers 613 provided on the travel body 610 are configured to be in close contact with both side surfaces of the travel rail 515 so that the carriage and the welder of the present invention operate more stably without shaking. This makes it possible to more smoothly perform welding operations requiring precision, such as TIG welding, which can greatly contribute to improving the welding quality as a whole.

Next, the frame unit 630 will be described.

The frame part 630 includes a vertical plate 631 which is largely connected to the traveling body part 610, and is connected in a horizontal direction to an upper portion of the vertical plate, such that a control box 635 and a wire feeding device 640 are provided at an upper portion thereof. It consists of a mounting plate 632 to be installed.

The traveling body 610, the vertical plate 631, and the mounting plate 632 are arranged in a 'c' shape around the rail support plate 511, which is disposed as shown in FIG. 7. 600 to properly distribute the overall load from the portion supported on the running rail 515 to ensure a stable running support structure, and to minimize the distance that the welder 300 protrudes from the rail support plate 511 do.

On the mounting plate, a control box 635, a wire feeder 640, a horizontal vertical adjustment unit 650, and the like are mounted and installed.

The wire feeding device 640 provides a feeding roller 643 on which the welding wire 641 is wound, and a feeding force to supply the feeding wire 641 to the welding machine 300 by the feeding roller 643. Supplying the welding wire 641 to the feed motor 645, the feed regulator 647 for adjusting the supply speed of the feed wire 641, and the wire clamp 380 to be described later on the feed regulator 647 side. It is made of a feed cable 648 and the like connected to.

Next, the horizontal vertical adjustment unit 650 will be described.

The horizontal and vertical adjustment unit 650 is installed to be supported on the mounting plate 633, so that the position of the welding torch 370 of the welder 300 can be adjusted in a horizontal (front and rear) or vertical (vertical) direction. The horizontal adjuster 651 and the vertical adjuster 655 are configured.

The horizontal adjusting part 651 and the vertical adjusting part 655 use a linear motor to move the welding machine 300 horizontally (forward and backward lengthwise) or vertically (radially in the direction of the steel pipe) like a conventional position adjusting device. It is configured to be moved to.

The regulator box 660 is installed on the front upper portion of the vertical adjustment unit 655, the regulator box 660 is connected to the control box 635 is configured to adjust the welding operation, weaving speed and the like.

Next, a welder 300 supported by the carriage 600 as described above and performing welding will be described. For reference, since the configuration of the welder 300 provided in the single body type automatic welding device SW is similar to that of the portable welding device PW described above, the same reference numerals are assigned to the same or similar components. The detailed description thereof will be omitted.

The welder 300 will be described in order from the portion connected to the vertical adjustment unit 655, the first support 310, the second support 320, the weaving operation unit 330, the fixing block 340, the rotating block ( 350, a torch clamp 360, a welding torch 370, a wire clamp 380, a sensor mounting module 390, and a contact sensor 400.

The first support 310 is formed long in the left and right direction, it is preferably formed of a rod structure made of an insulating material.

The second support 320 is fixedly installed at the center of the first support 310, and the sensor module installation 312 is formed at both sides thereof so that the sensor mounting module 390 may be installed. Referring to FIG. 19, the sensor module mounting part includes a hole 313 formed so as to fix the sensor mounting module 390 therein, and a slit 314 to divide the first support from the hole 313. It is formed so that the sensor mounting module 390 can be fixed by tightening the fixing bolt 315.

The second support 320 is installed long in the front of the center of the first support 310, the weaving operation unit 330 is configured on the upper and lower portions.

The weaving motor 331 is installed on the upper portion of the second support 320, the weaving plate 333 to enable the weaving operation is installed on the lower portion.

A fixing block 340 is installed below the weaving plate 333, and a rotating block 350 is installed on the side of the fixing block 340.

The torch clamp 360 is installed in the rotary block 350, and the welding torch 370 is assembled into the rotary block 350 by inserting the torch clamp 360 and the rotary block 350 upward and downward.

One side of the torch clamp 360 is provided with a wire clamp 380 for supporting the welding wire 641 provided from the wire feeder 640 and at the same time to guide the wire supplied to the end of the welding torch 370. .

The welding torch 370 mounted on the torch clamp 360 is configured to enable the gas-tungsten arc welding method, that is, the TIG welding method, among the arc welding methods. It is configured to supply an inert gas (eg, argon gas) around the electrode, and is configured to melt and weld the welding wire 641 while generating an arc between the electrode and the welding portion during welding.

The sensor mounting module 390 is configured to be mounted on both ends of the first support 310 as described above to mount the contact sensor 400.

Here, the welding apparatus of the present invention is mainly configured to use a TIG welding method, while the gap between the welded portion of the steel pipe and the welding torch 370 is kept constant at all times due to the characteristics of the TIG welding. It is necessary to proceed the welding to ensure excellent welding quality. Therefore, the contact sensor 400 is used as a method of maintaining a constant gap between the weld of the steel pipe and the welding torch.

The sensor mounting module 390 on which the contact sensor 400 is mounted is configured such that the sensor mounting module 390 is installed on both sides of the first support 310, respectively, in accordance with the welding direction of the steel pipe. It is a configuration for selectively installing the contact sensor 400.

The sensor mounting module 390 includes a cross adjuster 391 configured to be capable of adjusting the length of the sensor in the vertical and horizontal directions, and the first supporter coupled to the adjuster 391 in the horizontal direction. A horizontal adjustment knob 392 and a horizontal adjustment knob 392 configured to allow a position adjustment in the horizontal (front and rear) direction of the contact sensor 400 to be fixed to the end 310 are vertically coupled to the control unit 391. A vertical adjustment knob 393 configured to adjust the position of the sensor 400 in the vertical direction, a horizontal connecting portion 394 connected in a horizontal direction to an end of the vertical adjusting knob 393, and the horizontal connecting portion 394 It is configured as a sensor clamp (395) that is connected to the angle adjustable so that the contact sensor 400 is fixed.

In this case, the contact sensor 400 is a sensor that normally touches a specific object and detects a change in position thereof. As shown in the drawing, a sensor probe 401 and a signal transmission box 402 for transmitting a signal of the probe to the outside are provided. It is made to, so as to move along the portion to be welded on the outer surface of the steel pipe connecting portion serves to change the welding position of the welding torch 370 appropriately.

Of course, in the embodiment of the present invention has been described by illustrating the contact sensor 400, it is also possible to configure using a non-contact sensor 400 capable of tracking the welding position, depending on the conditions.

As described above, the touch sensor 400 uses the horizontal adjustment knob 392, the vertical adjustment knob 393, the horizontal connecting rod 394, and the connection portion of the sensor clamp 395 in the X, Y, Z, and θ directions. Position adjustment is possible. Such a contact sensor is preferably adjusted to be positioned as close as possible to the welding torch 370.

The touch sensor 400 is detected as being in contact with the outer surface of the steel pipe is input to the main control unit through a control box 635, etc., and the horizontal control unit in the horizontal control unit according to the detection result of the touch sensor 400 By operating the adjustment unit 650 to adjust the welding position of the welding torch 370.

Meanwhile, in the above, the configuration for setting the position of the contact sensor 400 is mainly made of a manual structure. However, the horizontal adjustment knob 392 and the vertical adjustment knob 393) can also be configured to adjust the position.

The welding torch rotating structure of the single body type automatic welding device SW according to the present invention is basically the same as that of the portable type automatic welding device described above.

And the left and right rotation structure of the welding torch is the same, but the single body type automatic welding device (SW) is provided with a sensor mounting module 390 on both sides, so that the contact sensor 400 can be mounted on either side. The configuration is different.

That is, Figure 21 and Figure 22 is a front view showing the main part of the rotating structure of the welding torch applied to the single body type automatic welding device in the present invention, as shown in the clockwise or counterclockwise direction of the steel pipe according to the welding implementation conditions The welding direction is set, and the welding torch 370 and the wire clamp 380 are rotated and positioned according to the direction.

In addition, when the contact sensor 400 is also mounted on any one of the sensor mounting module 390 provided on both the left and right so as to be located directly in front of the wire clamp 380, clockwise or counterclockwise depending on the implementation conditions Steel pipe welding can be performed freely.

Figure 23 is a perspective view showing a state in which the accessory equipment mounted on the accessory equipment mounting apparatus according to the present invention.

The auxiliary equipment mounting apparatus 10 (hereinafter also referred to as 'equipment mounting apparatus') according to the present invention is provided with a mounting base 11 that is largely mounted on the upper portion of the steel pipe P, and an upper portion of the mounting base 11. It consists of the mounted frame 20.

Each structure of this invention comprised in this way is demonstrated.

First, the mounting base 11 is formed in the same structure as the outer surface shape of the steel pipe to be seated on the upper portion of the steel pipe (P). That is, the seating base 11 is configured to form a plate having a predetermined width in a curved structure to match the outer surface of the steel pipe, it is configured to be stably coupled to the upper surface of the steel pipe.

The seating base 11 is provided with a non-slip member 15 on the bottom surface of the seating base 11 so as not to slip in the steel base.

Next, the mounting frame 20 is formed in a hexahedral structure as a whole is configured to mount the auxiliary equipment therein or on top.

In general, steel pipe orthopedic fittings (JR) and steel pipe automatic welding devices (SW, PW) (see Figs. 24 to 25), auxiliary equipment such as power supply, hydraulic supply, control box, welding machine control box, cooling device As necessary, the mounting frame 20 is configured to mount the additional equipment as described above.

Mounting frame 20 is formed in a hexahedral structure as a whole is fixed to the upper portion of the seating base (11).

As the mounting frame 20 is formed in the curved base structure, four vertical frames 21 standing vertically on both sides of the mounting base 11 are erected, and between the vertical frames 21. A horizontal frame 23 connected in the horizontal direction is configured, and a supporting member 25 is provided in an inner space formed of the horizontal frame 23.

The mounting frame 20 may be divided into a plurality of mounting spaces, which may be divided into a relatively large lower space A and a relatively smaller upper space B, and may also be divided into upper spaces B above. A separate mounting space or structure can be provided.

At this time, the division of each space is made through the horizontal frame 23 and the support member 25.

In the lower space (B) of the mounting frame 20 is mounted a relatively large auxiliary equipment such as a power supply device 51, a welder control device 52, a control box 53, the steel pipe connection construction in the upper space Tools, or various cables or cable connecting devices or other necessary parts for connecting the main body of the equipment and the auxiliary equipment.

In addition, the carriage mounting portion 30 is configured on the upper portion of the mounting frame 20 to mount the welding carriage 200 to be described later, the carriage mounting portion 30 is four inclined support 31 arranged in a structure gathered together. ) And horizontal supports 33 interconnected at the top of the inclined support 31.

And at the position where the inclined support 31 and the horizontal support 33 meet, the protrusion 35 protruding outward is formed.

The mounting frame 20 may be configured with a wire rod hanger 40 protruding to wind a connection wire such as a cable on one side. In addition, the mounting frame 20 is preferably provided with a lifting ring 45 for lifting the mounting equipment 10.

Meanwhile, in the above-described embodiment of the present invention, the mounting state of the auxiliary equipment required for the steel pipe automatic welding device (PW, SW) as shown in FIGS. 25 and 26 has been described by way of example, It is also possible to mount and configure hydraulic equipment, such as a control box, a hydraulic tank, and a hydraulic pump required for JR).

24 to 25 are views showing a state of use of the auxiliary equipment mounting apparatus 10 according to the present invention as described above.

FIG. 24 shows a state in which the equipment mounting apparatus 10 of the present invention is used in the orthopedic joint JR for matching steel pipes to be connected before welding the steel pipe.

In general, the orthopedic joint (JR) has a roundness at the end of the steel pipe so as to minimize the occurrence of the step difference in the steel pipe connection when the two steel pipes are held in the state in which the two orthopedic bodies 710 and 720 respectively hold the steel pipes one by one. After adjustment, both steel pipes are connected.

In such a state, tack welding is performed on both steel pipe joints, and then both steel pipes are connected by welding by using automatic welding devices PW and SW as shown in FIGS. 25 and 26.

The orthopedic joint (JR) is mounted around the steel pipe to form a steel pipe, and support auxiliary equipment is configured to closely adhere the steel pipes to each other, such support auxiliary equipment is installed in the equipment mounting apparatus 10 of the present invention. It can be configured.

As shown in the drawing, it can be configured to mount mainly hydraulic equipment 65 such as a power supply device 61 or a hydraulic tank, and a hydraulic line is provided between the equipment mounting apparatus 10 and the orthopedic joint (JR). Various cables C are configured to be connected.

FIG. 25 shows a state in which steel pipes are connected in a state where the equipment mounting apparatus 10 of the present invention is disposed behind the portable type automatic welding device PW provided for welding both steel pipes P. As shown in FIG.

That is, in the drawing, the traveling rail 100 of the automatic welding device PW is fixed around the front steel pipe, and the carriage 200 is mounted on the traveling rail, so that the carriage 200 is the traveling rail 100 during welding. Rotating along it welds the joints of both steel pipes. Of course, the carriage 200 is provided with a welding machine 300, etc., the carriage 200 is provided with a traveling motor, a wire feeder, a control controller and the like.

The equipment mounting apparatus 10 of the present invention is mounted on the same steel pipe P at the rear of the automatic welding device PW.

Welding support equipment is installed in the equipment mounting apparatus 10, for example, a power supply device 51, a control box 53, a welder control box 53, a cooling device 54, and the like may be installed.

Therefore, between the equipment mounting apparatus 10 and the automatic welding device (PW) is installed by connecting the cable (C), the welding machine 300 of the automatic welding device (PW) in the power supply device 51, the controller ( 310 is connected to supply power to the traveling motor, and the like, and the welder control box 53 is connected to the controller 310 to support or control a welding control operation, and the cooling device 54 is connected to the welder. Cables or wirings are connected to each other so as to cool the welding torch of 300.

In this way, while the equipment mounting apparatus 10 of the present invention is disposed on the steel pipe P immediately behind or in front of the automatic welding device PW, the automatic welding device PW or various control operation mechanisms are operated. Welding of the steel pipe P joint can be performed.

FIG. 26 is a view showing a state where the equipment mounting apparatus 10 of the present invention is used in a single body type automatic welding apparatus SW having a structure different from that of FIG.

That is, the single body type automatic welding device SW shown in FIG. 26 is composed of a circular body 500, a carriage 600, a welding machine 300 ', and the like, and is the same as the portable type automatic welding device PW. Since it is possible to use the auxiliary equipment, it is possible to perform automatic welding in a state of being placed and connected in the same manner as described above with reference to FIG.

As a result, since the equipment mounting apparatus 10 of the present invention can be placed directly on the upper part of the steel pipe already arranged at the construction site, it can be disposed at the position as close as possible to the welding equipment main body, and a separate arrangement space is required. It has the advantage that it can easily manage and deploy the welding equipment.

Now, a steel pipe connection construction method including the portable equipment according to the present invention made using the apparatus according to the present invention as described above will be described.

According to the present invention, one of the single body type automatic welding device (SW) and the portable type automatic welding device (PW) is selectively used according to the pipe construction site conditions, that is, the size of the construction space and the pipe type. do.

As shown in FIG. 24, both steel pipes P to be interconnected are formed by using both forming machines 710 and 720 of the steel pipe shaping device JR, and the two steel pipes are towed to be aligned with each other.

Thereafter, the orthopedic device (JR) is separated from the steel pipes (P), and then an automatic welding device is mounted on one steel pipe. At this time, when the steel pipe welding construction space is too small to mount the single body type automatic welding device (SW), the portable type automatic welding device (PW) is mounted, and when the construction space is relatively large, the single Select one of body type automatic welding device (SW) and portable type automatic welding device (PW).

That is, when the space where the pipe is installed is narrow or the trench is difficult to use the single body type automatic welding device (SW), the portable type automatic welding device (PW) having a relatively small volume and a small turning radius of the carriage or the like is difficult. )).

However, if the space is relatively large, one of the two automatic welding devices (SW, PW) is selectively used. Preferably, a single body type automatic welding device (SW) is used.

In addition, when the steel pipe connecting portion is a straight section as shown in Fig. 26, one of the single body type automatic welding device (SW) and the portable type automatic welding device (PW) is selected (in the drawing, the single body type automatic welding device is installed. And the portable type automatic welding device (PW) when the steel pipe connecting portion is a curved section as shown in FIG. 25.

Here, the reason why the portable type automatic welding device (PW) is installed in the case where the steel pipe connection is a curved section is that the pipe is bent at the time of pipe construction, that is, when the curved pipe is installed, the release pipe (P ') is used. Since the center of gravity is biased to one side, welding with the steel pipe (P1 or P2) to be connected with minimum step is difficult.

In this state, when welding by mounting a relatively heavy single-body type automatic welding device (SW), the welded portion between the release pipe (P ') and the steel pipe (P1) connected thereto, or the step is increased. As a result, the welding work of the steel pipe joint is not easy, or a problem occurs that the defect rate increases.

Therefore, in the case where the steel pipe connection part is a curved section, when welding with a portable light type automatic welding device (PW) having a relatively light load, welding can be performed in a state in which a step difference is minimized. It can be increased.

As described above, the automatic welding device is selected according to the size of the construction space and the pipe shape, and the steel pipe is connected by welding the circumference of the steel pipe using the selected automatic welding device.

On the other hand, Figures 24 to 25 are diagrams showing the construction of the steel pipe connection state in the state of mounting the auxiliary equipment mounting apparatus 10 on the steel pipe, the auxiliary equipment mounting apparatus 10 is placed on the upper portion of the steel pipe, this auxiliary equipment mounted Steel pipe connection construction is preferably made in the state of connecting the device (10) and the orthopedic device (JR) or automatic welding device (PW, SW) and the cable (C).

Of course, it is not necessary to use the auxiliary equipment mounting apparatus 10 mounted on the steel pipe, but when using the auxiliary equipment mounting apparatus 10 according to the present invention, the auxiliary equipment can be located in the position closest to the construction equipment main body. This makes it possible to improve construction convenience and stability as well as convenience of construction work.

1 to 6 are views showing a steel pipe butt-tig welding method of the prior patent invention,

7 is a perspective view showing a portable type automatic welding device having a welding torch rotating structure according to the present invention mounted on a steel pipe;

8 is a detailed view of the portable type automatic welding device shown in FIG. 7;

9 is a front view showing a portable type automatic welding apparatus according to the present invention mounted on a steel pipe,

10 is a side view showing a portable type automatic welding device according to the present invention mounted on a steel pipe,

11 is a plan view showing a portable type automatic welding apparatus according to the present invention mounted on a steel pipe,

12 is a view showing a state in which the travel body is mounted on the travel rail of the present invention,

Figure 13 is a side view for explaining the welder weaving structure in the present invention,

Figure 14 is an exploded perspective view for explaining the front and rear rotational motion of the welding torch in the present invention,

15 is a cross-sectional view of a combined state of two blocks seen in the direction of C-C of FIG. 14;

16 and 17 is a front view of the main portion showing a rotating structure of the welding torch in the present invention,

18 is a perspective view showing a single body type automatic welding device according to the present invention;

19 is a detailed view of the main part is shown a single body type automatic welding apparatus according to the present invention,

20 is a front view of the main part of a single body type automatic welding apparatus according to the present invention;

21 and 22 is a front view showing the main part showing a rotating structure of the welding torch applied to the single body type automatic welding device in the present invention,

Figure 23 is a perspective view showing a state in which the accessory equipment mounted on the accessory equipment mounting apparatus according to the present invention,

24 is a perspective view showing a state connected to the accessory equipment mounting apparatus according to the present invention connected to the orthopedic device,

25 is a perspective view showing a state in which the accessory equipment mounting apparatus according to the invention connected to a portable type automatic welding device,

26 is a perspective view showing a state in which the accessory equipment mounting apparatus according to the present invention is connected to a single body type automatic welding device.

Claims (3)

A single body type automatic welding device having a circular body mounted around the steel pipe, and having a traveling rail provided to weld the steel pipe while the carriage and the welder move along the traveling rail; It is relatively small in volume and has a smaller radius of rotation of the carriage than the automatic welding device. The portable rail is mounted around the steel pipe and configured to weld the steel pipe while the carriage and the welder move along the traveling rail. As a construction method of connecting the steel pipe using a welding device, Shaping both steel pipes to be interconnected using both forming machines of the steel pipe shaping device, aligning both steel pipes so as to face each other, and then welding and connecting both steel pipes; After separating the orthopedic device from the steel pipe, the automatic welding device is mounted on one of the steel pipes, but when the steel pipe welding space is too small to mount the single body type automatic welding device, the portable welding device of the portable type Mounting and selecting one of the single body type automatic welding device and the portable type automatic welding device when the construction space is relatively large;  Steel pipe connection construction method including a portable type TIG (TIG) automatic welding equipment comprising the step of connecting the steel pipe by welding the circumference of the steel pipe using the automatic welding device mounted to the steel pipe in the step. A single body type automatic welding device having a circular body mounted around the steel pipe, and having a traveling rail provided to weld the steel pipe while the carriage and the welder move along the traveling rail; As a construction method for connecting steel pipes by using a portable type automatic welding device, which is mounted around the steel pipe and the carriage and the welder move along the traveling rail to weld the steel pipe. Shaping both steel pipes to be interconnected using both forming machines of the steel pipe shaping device, and aligning the two steel pipes to be in a mutually opposed state; After separating the orthopedic device from the steel pipe, the automatic welding device is mounted on one of the steel pipes. If the steel pipe connection part is a straight section, one of the single body type automatic welding device and the portable type automatic welding device is selected and mounted. If the steel pipe connection is a curved section, mounting the automatic welding device of the portable type;  Steel pipe connection construction method including a portable type TIG (TIG) automatic welding equipment comprising the step of connecting the steel pipe by welding the circumference of the steel pipe using the automatic welding device mounted to the steel pipe in the step. The method according to claim 1 or 2, The auxiliary equipment mounting device on which the supporting equipment required for the orthopedic device, the single body type automatic welding device, or the portable type automatic welding device is mounted is placed on the upper portion of the steel pipe, and the auxiliary equipment mounting device and the orthopedic device or automatic Steel pipe connection construction method including portable type TIG (TIG) automatic welding equipment characterized in that the construction of the steel pipe connection in the state of connecting the welding device and the cable.

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