KR20190137254A - Overlay welding apparatus for monitoring pipe - Google Patents

Abstract

According to one embodiment of the present invention, provided is a pipe monitoring overlay welding device comprising: a pipe support part for fixing and rotating a pipe for overlay welding; a tool part for overlay welding the pipe; a moving means for moving the tool part in a longitudinal direction of the pipe; a sensing part for sensing a welding voltage and a welding current when overlay welding of the pipe through the tool part; a camera part for photographing an overlay welding state of the pipe; and a control part for analyzing the welding voltage and the welding current measured by the sensing part to determine a welding quality of a welding part of the pipe. Therefore, the present invention is capable of checking a quality of the overlay welding of the pipe while maintaining a welding thickness and smoothness constant.

Description

Pipe monitoring overlay welding device {OVERLAY WELDING APPARATUS FOR MONITORING PIPE}

The present invention relates to a pipe monitoring overlay welding apparatus, and more particularly, to a pipe monitoring overlay welding apparatus that can reduce the error of the overlay welding during overlay welding of large diameter pipe.

In general, the pipe used for the piping equipment of power plants or petrochemical plants is subjected to an overlay welding of a certain thickness welded with a dissimilar metal such as stainless steel or nickel alloy having durability, corrosion resistance and high strength.

Such overlay welding can improve the corrosion resistance, durability, wear resistance, strength and the like by coating the metal surface by welding when a metal having weak physical properties is used in a very vulnerable environment.

However, when overlay welding is performed on a conventional long pipe, bending deformation may occur in the long pipe by welding heat. When the deflection occurs, the overlay weld layer is not evenly formed in the long pipe.

For example, when the long pipe is bent in the process of overlay welding, the spacing of the torch relative to the inner surface of the long pipe may be different, and thus, the thickness of the weld bead generated on the inner surface of the long pipe may vary. As a result, a uniform weld bead layer is not formed in the long pipe.

In the overlay welding, there is a demand for a technique capable of diagnosing the overlay quality of the pipe while preventing the bending of the pipe so that the weld thickness and the smoothness are kept constant.

The technical problem to be achieved by the present invention is to provide a pipe monitoring overlay welding apparatus that can check the overlay welding quality of the pipe, while maintaining the welding thickness and smoothness.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems that are not mentioned may be clearly understood by those skilled in the art from the following description. There will be.

In order to achieve the above technical problem, an embodiment of the present invention is a pipe support for fixing and rotating the pipe for overlay welding; A tool unit for overlay welding the pipe; Moving means for moving the tool portion in the longitudinal direction of the pipe; A detector configured to sense a welding voltage and a welding current during overlay welding of the pipe through the tool unit; A camera unit photographing an overlay welding state of the pipe; And a controller for analyzing the welding voltage and the welding current measured by the sensing unit to determine a welding quality of the welding portion of the pipe.

In an embodiment of the present invention, it may further include a deformation preventing jig having an inner diameter corresponding to the outer surface of the pipe to surround the outer surface of the pipe.

In an embodiment of the present invention, it may further include a support jig disposed at both ends of the deformation prevention jig to rotatably support the deformation prevention jig.

In an embodiment of the present invention, the control unit may further include a notification unit for notifying the user of abnormalities in welding quality for the overlay welding according to the control signal of the controller.

In an embodiment of the present invention, in order to cool the pipe heated by the overlay welding, it may further include a cooling unit for spraying water to the deformation preventing jig.

In the embodiment of the present invention, the deformation preventing jig may be formed with a plurality of through-holes for guiding the cooling water to the outer surface of the pipe.

In an embodiment of the present invention, the tool unit comprises a torch for overlay welding an inner surface or an outer surface of the pipe; A wire feeder for supplying a welding wire to the torch; And a boom on which the torch and the wire feeder are mounted.

In an embodiment of the present invention, the moving means includes a support wire disposed through the pipe; A connection piece for connecting between the support wire and the tool portion; And a cart installed to be movable in the longitudinal direction of the pipe such that the tool part moves along the support wire.

In an embodiment of the present invention, the control unit graphs the welding voltage and the welding current measured by the sensing unit, and compares the graphed measurement waveform of the welding voltage and welding current with a preset standard waveform. When the measurement waveform is out of the range of the standard waveform, it may be determined that an abnormal welding quality is generated at the welding part out of the range of the standard waveform.

In an embodiment of the present invention, the control unit graphs bead geometry with respect to the vertical deformation of the pipe photographed by the camera unit, and measures the bead height and the preset bead height of the graphed bead geometry. After comparing the average bead height, if the measured bead height is out of the range of the average bead height, it may be determined that abnormal welding quality is generated in the welded portion out of the range of the average bead height.

In order to achieve the above technical problem, an embodiment of the present invention is a pipe support for fixing and rotating the pipe for overlay welding; A tool unit for overlay welding the pipe; Moving means for moving the tool portion in the longitudinal direction of the pipe; A detector configured to sense a welding voltage and a welding current during overlay welding of the pipe through the tool unit; A deformation preventing jig having an inner diameter corresponding to the outer surface of the pipe to surround the outer surface of the pipe; And a controller which analyzes the welding voltage and the welding current measured by the sensing unit to determine a welding quality of the welding portion of the pipe.

In an embodiment of the present invention, it may further include a supporter jig disposed at both ends of the deformation prevention jig to rotatably support the deformation prevention jig.

In an embodiment of the present invention, the control unit may further include a notification unit for notifying the user of abnormalities in welding quality for the overlay welding according to the control signal of the controller.

In an embodiment of the present invention, in order to cool the pipe heated by the overlay welding, it may further include a cooling unit for spraying water to the deformation preventing jig.

In an embodiment of the present invention, the deformation preventing jig may be formed a plurality of through-holes for the water to the cooling portion to deliver to the pipe.

In an embodiment of the present invention, the tool unit comprises a torch for overlay welding an inner surface or an outer surface of the pipe; A wire feeder for supplying a welding wire to the torch; And a boom on which the torch and the wire feeder are mounted.

In an embodiment of the present invention, the moving means includes a support wire disposed through the pipe; A connection piece for connecting between the support wire and the tool portion; And a cart installed to be movable in the longitudinal direction of the pipe such that the tool part moves along the support wire.

In an embodiment of the present disclosure, the controller graphs the welding voltage and the welding current measured by the sensing unit, and compares the graphed measurement waveform of the welding voltage and the welding current with a preset standard waveform. When the measurement waveform is out of the range of the standard waveform, it may be determined that an abnormal welding quality is generated at the welding part out of the range of the standard waveform.

According to the embodiment of the present invention, by preventing the bending deformation of the pipe through the deformation preventing jig, it is possible to maintain the welding thickness and smoothness of the pipe at the time of overlay welding.

In addition, according to an embodiment of the present invention, by monitoring the overlay welding state on the pipe in real time through the camera unit, it is possible to diagnose the welding error, weld defects and welding quality of the overlay on the pipe.

In addition, according to the embodiment of the present invention, by cooling the pipe through the cooling unit, it is possible to prevent the deformation of the pipe due to the welding heating in advance, thereby, it is possible to maintain a constant welding thickness and smoothness of the pipe.

The effects of the present invention are not limited to the above-described effects, but should be understood to include all the effects deduced from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a block diagram showing a pipe monitoring overlay welding apparatus according to an embodiment of the present invention.
2 is an enlarged view illustrating a tool unit of the pipe monitoring overlay welding apparatus according to an embodiment of the present invention.
3 is a block diagram showing the control logic of the pipe monitoring overlay welding apparatus according to an embodiment of the present invention.
4 is a photograph showing a pipe for a welding experiment according to an embodiment of the present invention.
5 is a graph illustrating a welding current, a welding voltage, and a welding bead measured at a welding position 4 of a pipe according to an exemplary embodiment of the present invention.
FIG. 6 is a graph illustrating a welding current, a welding voltage, and a welding bead measured at a welding position 5 of a pipe according to an embodiment of the present invention.
FIG. 7 is a graph illustrating a welding current, a welding voltage, and a welding bead measured at a welding position 6 of a pipe according to an embodiment of the present invention.
8 is a graph illustrating a welding current, a welding voltage, and a welding bead measured at a welding position 10 of a pipe according to one embodiment of the present invention.
FIG. 9 is a graph of Mahalanobis distance MD at welding positions 1, 4, 5, and 10 of a pipe according to one embodiment of the present invention.
FIG. 10 is a graph of weld bead heights measured at weld positions 1 to 10 of a pipe, according to one embodiment of the invention.

Hereinafter, with reference to the accompanying drawings will be described the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, coupled)" with another part, it is not only "directly connected" but also "indirectly connected" with another member in between. "Includes the case. In addition, when a part is said to "include" a certain component, this means that it may further include other components, without excluding the other components unless otherwise stated.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

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

1 is a block diagram showing a pipe monitoring overlay welding apparatus according to an embodiment of the present invention, Figure 2 is an enlarged view showing the enlarged tool portion of the pipe monitoring overlay welding apparatus according to an embodiment of the present invention, 3 is a block diagram showing the control logic of the pipe monitoring overlay welding apparatus according to an embodiment of the present invention.

1 to 3, the pipe monitoring overlay welding apparatus 10 according to an embodiment of the present invention, the pipe support 100, the moving means 300, the sensing unit 400, the camera unit ( 500, the deformation preventing jig 710, the support jig 720, the notification unit 800, the cooling unit 900, and the controller 600 may be included.

Specifically, the pipe support part 100 may include a configuration for rotating in a state where the end of the pipe P is fixed. For example, the pipe support part 100 may include a processing chuck 110 fixing one end of the pipe P, and a rotating motor (not shown) for rotating the processing chuck 110.

In the present embodiment, a configuration in which the processing chuck 110 is rotated by the rotary motor in a state where the processing chuck 110 of the pipe support 100 is fixed to one end of the pipe P is described, but is not limited thereto. No, various configurations for fixing and rotating the pipe P may be applied to the present invention in overlay welding. For example, while the machining chuck 110 is fixed to the pipe P, the overlay welding may be performed by the relative rotational movement of the tool 200.

The tool part 200 may include a welding mechanism configuration for overlay welding the welding portion O of the pipe P. For example, the tool unit 200 may include a torch 210 for overlay welding the inner surface or the outer surface of the pipe P, a wire feeder 220 for supplying a welding wire W to the torch 210, and a torch 210. ) And a boom 230 to which the wire feeder 220 is mounted.

Here, since the torch 210 and the wire feeder 220 correspond to the torch 210 and the wire feeder 220 which are commonly used for overlay welding, a detailed description thereof will be omitted. Since the boom 230 is moved in the longitudinal direction of the pipe (P) through the moving means 300, the torch 210 is moved in the longitudinal direction of the pipe (P), the entire inner surface or the entire outer surface of the pipe (P) Overlay welding can be performed.

The moving means 300 includes a support wire 310, a connecting piece 320, and a cart 330. The tool unit 200 is piped for overlay welding of the welding portion O of the pipe P. It can be moved in the longitudinal direction of (P).

Here, the support wire 310 is a wire rope disposed through the pipe P, and may maintain a taut tension state. The camera wire 500 and the connection piece 320 may be mounted on the support wire 310. The connection piece 320 is a bracket for connecting between the support wire 310 and the tool part 200, and may be fixedly installed at one end of the tool part 200. The connection piece 320 may be coupled in a state where the support wire 310 is penetrated. The cart 330 is installed to be movable in the longitudinal direction of the pipe P, and may move the tool part 200 together with the support wire 310.

In the present embodiment, the moving means 300 is composed of a support wire 310, the connecting piece 320 and the cart 330, but in addition to these configurations, for moving the tool 200 in the longitudinal direction of the pipe (P) Various configurations may be used as the vehicle 300. For example, the tool unit 200 may be configured to be moved by the cart 330 in the longitudinal direction of the pipe P while being guided by the support wire 310.

The detector 400 may detect a welding voltage and a welding current when overlay welding of the pipe P is performed. The sensing unit 400 may sense the welding voltage and the welding current that are changed during the overlay welding on the pipe P.

Measurement data about the welding voltage and the welding current detected by the sensing unit 400 may be applied to the control unit 600. In this case, the control unit 600 may receive the measurement data on the welding voltage and the welding current from the sensing unit 400 to perform an automatic voltage control (AVC) function. Here, the AVC may be understood as a function of adjusting the height of the torch 210 to maintain the preset voltage.

The camera unit 500 may photograph an overlay welding state of the welding portion O of the pipe P. FIG. To this end, the camera unit 500 may be disposed adjacent to the welded portion of the pipe P on which the overlay welding is performed by the torch 210 of the tool 200. For example, the camera unit 500 may be fixed to the support wire 310 positioned adjacent to the torch 210. Of course, in addition to the support wire 310, the camera unit 500 may be installed at various positions for effectively photographing the welded portion of the pipe (P).

The deformation preventing jig 710 may be provided in the form of a cover surrounding the outer surface of the pipe (P). For example, the deformation preventing jig 710 may be formed in the shape of a pipe P having an inner diameter corresponding to the outer surface of the pipe P to surround the outer surface of the pipe P.

A plurality of through holes 711 may be spaced apart from the deformation preventing jig 710. The plurality of through holes 711 may guide the water provided from the cooling unit 900 to the outer surface of the pipe P. In this case, the water transferred to the pipe P may effectively cool the periphery of the welding portion O of the pipe P when the pipe P is heated by the overlay welding.

The support jig 720 may be disposed at both ends of the deformation preventing jig 710 to rotatably support the deformation preventing jig 710. On the upper surface of the support jig 720 to which the deformation preventing jig 710 is in contact, a bearing (not shown) may be provided to smoothly support the rotation of the deformation preventing jig 710.

The notification unit 800 may notify the user of abnormality of welding quality for overlay welding according to a control signal of the controller 600. The notification unit 800 may be configured in the form of a warning lamp to visually display the abnormality of the welding quality to the user, or may be configured in the form of a warning speaker to inform the user of the abnormality of the welding quality.

The cooling unit 900 may spray water onto the deformation preventing jig 710 to cool the pipe P heated by overlay welding. For example, the cooling unit 900 may include a spray nozzle 910 for spraying water onto the deformation preventing jig 710 and a water tank 920 for supplying high pressure water to the spray nozzle 910. .

The controller 600 may determine the welding quality of the welded portion of the pipe P by analyzing the welding voltage and the welding current measured by the detector 400. For example, the control unit 600 receives the measurement data for the welding voltage and the welding current from the sensing unit 400, graphs the applied measurement data in the form of a waveform, and the graph of the graphed welding voltage and welding current You can compare the measured waveform with the preset standard waveform.

In this case, when the measurement waveform is out of the range of the standard waveform, the controller 600 may determine that a welding quality abnormality is generated at the welding part out of the range of the standard waveform. When it is determined that abnormal welding quality occurs in the welded area, the controller 600 may apply a notification signal for whether the welding quality is abnormal to the notification unit 800.

In addition, the controller 600 may determine the welding quality of the welded portion of the pipe P by analyzing an image signal of the welded portion photographed by the camera unit 500. For example, the controller 600 receives an image signal for the welding portion from the camera unit 500 and then uses the image signal applied from the camera unit 500 to perform bead geometry for the vertical deformation of the pipe P. geometry can be graphed.

Subsequently, the controller 600 compares the measured bead height of the graphed bead geometry with a preset average bead height, and when the measured bead height is out of the range of the average bead height, It can be judged that abnormal welding quality has occurred. When it is determined that abnormal welding quality occurs in the welded area, the controller 600 may apply a notification signal for whether the welding quality is abnormal to the notification unit 800.

In particular, the present invention by creating a graphical user interface (GUI) -based monitoring control environment that can work through the graphic, when the user exchanges information with the control unit 600, the user uses a mouse or the like on the screen of the computer You can easily work by selecting the menu.

Hereinafter, an embodiment of a welding experiment for determining welding quality according to the GUI will be described.

4 is a photograph showing a pipe for a welding experiment according to an embodiment of the present invention, Figure 5 is a welding current, welding voltage and welding bead measured at the welding position 4 of the pipe, according to an embodiment of the present invention 6 is a graph illustrating a welding current, a welding voltage, and a welding bead measured at a welding position 5 of a pipe according to an embodiment of the present invention, and FIG. 7 is a diagram illustrating one embodiment of the present invention. For example, a graph illustrating a welding current, a welding voltage, and a welding bead measured at the welding position 6 of the pipe, FIG. 8 is a welding current measured at the welding position 10 of the pipe, according to an embodiment of the present invention. 9 is a graph of welding voltage and welding bead, and FIG. 9 is a graph of Mahalanobis distance MD at welding positions 1, 4, 5, and 10 of a pipe according to an embodiment of the present invention. 10 is a wave according to one embodiment of the present invention, It is a graph which graphed the weld bead height measured in the welding position of 1-10.

As shown in FIG. 4, after the deformation preventing jig 710 is applied to the pipe P having a length of 1500 mm, the inner surface of the pipe P is overlay welded. In this case, the welding current and the welding voltage of the overlay welding are measured at the welding positions 1 to 10 of FIG. 4. Overlay welding test conditions are shown in Table 1 below.

As shown in FIG. 5, the controller 600 may graph the current waveform and the voltage waveform by using the welding current and the welding voltage measured at the welding position 4 (measurement time 70 min to 75 min) of the pipe P. The trajectory of current and voltage can be analyzed and the AVC displacement can be calculated.

The controller 600 may graph the bead geometry with respect to the vertical deformation of the test piece (pipe) by using an image signal applied from the camera unit 500 photographed at the welding position 4 of the pipe P.

As shown in FIG. 6, the control unit 600 may graph the current waveform and the voltage waveform using the welding current and the welding voltage measured at the welding position 5 (measurement time 90min to 95min) of the pipe P. The trajectory of current and voltage can be analyzed and the AVC displacement can be calculated.

In addition, the controller 600 may graph the bead geometry in the vertical deformation of the test piece (pipe) by using the image signal applied from the camera unit 500 photographed at the welding position 5 of the pipe P.

As illustrated in FIG. 7, the controller 600 may graph the current waveform and the voltage waveform using the welding current and the welding voltage measured at the welding position 6 (measurement time 110min to 115min) of the pipe P. The trajectory of current and voltage can be analyzed and the AVC displacement can be calculated.

The controller 600 may graph the bead geometry with respect to the vertical deformation of the test piece (pipe) by using an image signal applied from the camera unit 500 photographed at the welding position 6 of the pipe P.

As shown in FIG. 8, the controller 600 may graph the current waveform and the voltage waveform by using the welding current and the welding voltage measured at the welding position 10 (measurement time 190min to 195min) of the pipe P. Trajectories of current and voltage can be analyzed and automatic voltage control (AVC) displacement values can be calculated.

The controller 600 may graph the bead geometry with respect to the vertical deformation of the test piece (pipe) by using an image signal applied from the camera unit 500 photographed at the welding position 10 of the pipe P.

As described above, the controller 600 graphs the weld voltage and the weld current measured by the detector 400, compares the graphed weld voltage and the weld waveform with a preset standard waveform, and then measures the measured waveform. If it is out of the range of this standard waveform, it can be judged that abnormal welding quality generate | occur | produced in the welding part out of the range of a standard waveform.

In particular, the controller 600 may easily detect welding defects on the welded portion using the Mahalanobis distance (MD).

For example, the control unit 600 is the current of the welding part 1 (welding initial position), welding part 4 (wire servo displacement maximum position), welding part 5 (current / voltage standard deviation maximum position) and welding part 10 (welding end position). And the Mahalanobis distance MD may be calculated based on the voltage data, and the welding quality may be evaluated using the calculated Mahalanobis distance. The Mahalanobis distance MD may be calculated through Equation 1 below.

Where V = Arc voltage, r = Correlation coefficient and C = Welding current.

As shown in FIG. 9, as a result of analyzing the Mahalanobis distance (MD) according to the progress of the overlay welding process, it was confirmed that the clustering phenomenon during the welding was formed densely at the welding site 1 (the initial welding position). In addition, the arc instability affects the Mahalanobis distance in the welding part 5 (the maximum current / voltage standard deviation position) and the welding part 10 (the welding end position) due to the sudden change in the AVC value due to the welding deformation. Judging.

On the other hand, as shown in Figure 10, the control unit 600 may determine the welding quality of the welded portion of the pipe (P) by analyzing the image signal for the welded portion photographed by the camera unit 500.

For example, the controller 600 compares the measured bead height of the graphed bead geometry (shown with a blue line) with a preset average bead height (shown with a red line), and then the measured bead height is within the range of the average bead height. In other words, if it is out of the +,-error range on the basis of the average bead height, it can be determined that abnormal welding quality is generated in the welding portion outside the average bead height.

The above description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is represented by the following claims, and it should be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present invention.

100: pipe support 200: tool
210: torch 220: wire feeder
230: boom 300: moving means
310: support wire 320: connection piece
330: cart 400: detection unit
500: camera unit 600: control unit
710: deformation prevention jig 720: support jig
800: notification unit 900: cooling unit

Claims (18)

A pipe support for fixing and rotating the pipe for overlay welding;
A tool unit for overlay welding the pipe;
Moving means for moving the tool portion in the longitudinal direction of the pipe;
A detector configured to sense a welding voltage and a welding current during overlay welding of the pipe through the tool unit;
A camera unit photographing an overlay welding state of the pipe; And
And a controller configured to determine the welding quality of the welded portion of the pipe by analyzing the welding voltage and the welding current measured by the sensing unit. The method of claim 1,
And a deformation preventing jig having an inner diameter corresponding to the outer surface of the pipe to surround the outer surface of the pipe. The method of claim 2,
And a support jig disposed at both ends of the deformation preventing jig to rotatably support the deformation preventing jig. The method of claim 1,
Pipe monitoring overlay welding device further comprises a notification unit for notifying the user of the abnormality of the welding quality for the overlay welding according to the control signal of the control unit. The method of claim 2,
And a cooling unit for spraying water onto the deformation preventing jig to cool the pipe heated by the overlay welding. The method of claim 5,
The deformation preventing jig
And a plurality of through-holes spaced apart from each other to guide the cooling part to the outer surface of the pipe. The method of claim 1,
The tool part
A torch for overlay welding the inner or outer surface of the pipe;
A wire feeder for supplying a welding wire to the torch; And
And a boom to which said torch and said wire feeder are mounted. The method of claim 1
The means of transportation
A support wire disposed through the pipe;
A connection piece for connecting between the support wire and the tool portion; And
And a cart mounted movably in the longitudinal direction of the pipe such that the tool portion moves along the support wire. The method of claim 1,
The control unit
After graphing the welding voltage and the welding current measured by the sensing unit, comparing the graphed measurement waveform of the welding voltage and the welding current with a preset standard waveform, the measurement waveform determines the range of the standard waveform. When out of the pipe monitoring overlay welding apparatus for determining that the weld quality abnormality is generated in the welding portion outside the range of the standard waveform. The method of claim 1,
The control unit
Graphing bead geometry for the vertical deformation of the pipe taken by the camera unit, comparing the measured bead height of the graphed bead geometry with a predetermined average bead height, and then measuring the bead geometry. If the height is out of the range of the average bead height, the pipe monitoring overlay welding apparatus for determining that a weld quality abnormality is generated in the welding portion outside the range of the average bead height. A pipe support for fixing and rotating the pipe for overlay welding;
A tool unit for overlay welding the pipe;
Moving means for moving the tool portion in the longitudinal direction of the pipe;
A detector configured to sense a welding voltage and a welding current during overlay welding of the pipe through the tool unit;
A deformation preventing jig having an inner diameter corresponding to the outer surface of the pipe to surround the outer surface of the pipe; And
And a controller configured to determine the welding quality of the welded portion of the pipe by analyzing the welding voltage and the welding current measured by the sensing unit. The method of claim 11,
And a supporter jig disposed at both ends of the deformation preventing jig to rotatably support the deformation preventing jig. The method of claim 11,
Pipe monitoring overlay welding device further comprises a notification unit for notifying the user of the abnormality of the welding quality for the overlay welding according to the control signal of the control unit. The method of claim 11,
And a cooling unit for spraying water onto the deformation preventing jig to cool the pipe heated by the overlay welding. The method of claim 14,
The deformation preventing jig
Pipe monitoring overlay welding device in which a plurality of holes are spaced apart for the water of the cooling unit to deliver to the pipe. The method of claim 11,
The tool part
A torch for overlay welding the inner or outer surface of the pipe;
A wire feeder for supplying a welding wire to the torch; And
And a boom to which said torch and said wire feeder are mounted. The method of claim 11,
The means of transportation
A support wire disposed through the pipe;
A connection piece for connecting between the support wire and the tool portion; And
And a cart mounted movably in the longitudinal direction of the pipe such that the tool portion moves along the support wire. The method of claim 11,
The control unit
After graphing the welding voltage and the welding current measured by the sensing unit, comparing the graphed measurement waveform of the welding voltage and the welding current with a preset standard waveform, the measurement waveform determines the range of the standard waveform. If out, the pipe monitoring overlay welding apparatus for determining that there is an abnormality in the welding quality in the welding portion outside the range of the standard waveform.

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