JPH1034329A - Method and device for welding annular article of large diameter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform the butt welding of tubes of large diameter to each other with small number of workers. SOLUTION: In welding each butted part 7 of a plurality of iron tubes 1a-1d, the iron tubes are turnably supported by a turning equipment 2, a submerged arc welding equipment 11 is installed corresponding to each butted part 7, and a back chipping equipment 32 is installed corresponding to each butted part. In addition, video camera devices 22, 23, 36 to photograph each welding part and back chipping part are installed, and the welding equipment 11 and the back chipping equipment 32 are individually or collectively operated from the side of a control panel 51 provided with monitors 53, 54 of the video camera devices 22, 23, 36.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding method and a welding apparatus applied to butt welding of large-diameter annular objects.

[0002]

2. Description of the Related Art Large-diameter annular structures such as penstocks (for example, water steel pipes, tanks, etc.) are manufactured by circumferentially welding cylinders and the like that are manufactured separately. And
In the case of manufacturing this penstock by submerged arc welding, conventionally, one operator operated one submerged arc welder and welded one seam at a time. Also, the back of the weld was lifted by one worker every seam.

[0003]

As described above, the production of a large-diameter iron pipe by submerged arc welding is inefficient because one operator operates the welding machine and welds every seam. Met.

In addition, in a submerged arc welding machine, it is necessary to add an additive such as steel wool or iron powder to the tip of a wire in order to more stably and easily generate an arc at the start of an arc. However, the work is performed by the welding machine for each welding machine, which is also inefficient in this aspect.

[0005] A welding apparatus including a submerged arc welding machine is provided with a welding line tracing mechanism, but its function is only to follow the groove, and when the inside of the groove cannot be copied, such as welding of a finishing layer. Therefore, the operator had to operate the welding rod (wire) while always checking the target position nearby.

A rolling earth is installed at the end of a pipe as a material to be welded as an earth. However, when a plurality of welding machines are used, the diameter of a cable becomes large, and a pipe corresponding to a current output cannot be used.

[0007] In submerged arc welding, it is necessary to check the remaining amount of flux. Conventionally, however, one operator monitors each flux hopper provided in each welding apparatus in close proximity and timely to replenish the flux. I was going.

[0008] Furthermore, the work for hanging the back of the welded portion is not implemented as a device, and the worker performs the hanging of the back while checking the target position for each seam, which also deteriorates the efficiency of the work.

As described above, the conventional submerged arc welding of a large-diameter pipe has a problem that the efficiency is low and the burden on the operator is large.

[0010]

Means for Solving the Problems To solve the above-mentioned problems, the construction of the welding method for a large-diameter annular object according to the present invention is such that when the large-diameter annular objects are butt-welded to each other, the inside of the butted annular objects or On the outside, a plurality of welding devices are arranged so as to be movable along the butt portion of the annular object, and on the outside or inside of the annular object, a plurality of lifting devices are installed so as to be movable along the butt portion of the annular object. The welding device and the hanging device can be individually controlled and a plurality of devices can be simultaneously controlled, and the welding operation by the welding device and the hanging operation by the lifting device are respectively photographed by a television camera and projected on a monitor. And controlling the suspension device.

According to the above-mentioned welding method, a plurality of butt portions of a large-diameter annular object can be welded simultaneously and by remote control, thereby improving welding efficiency and saving labor.

In order to solve the above-mentioned problems, a large diameter annular welding apparatus according to the present invention is configured to butt and weld large diameter annular objects to each other, and is installed inside or outside the butted annular objects. A plurality of welding devices that can be relatively moved along a butt portion of the annular member, and a hanging device that is installed outside or inside the annular member and that can relatively move along the butt portion of the annular member. A camera device that captures an image of a working unit using the welding device and the lifting device; and a monitor that captures an image from the camera device, and a control unit that includes an operation unit that controls the welding device and the lifting device. It is characterized by.

In the above welding device, the welding of the butted portion of the annular object is automatically performed by the welding device. The back of the weld is also automatically suspended by the suspension device. The welding work unit and the hanging work unit are photographed by the camera device and are displayed on the monitor of the control unit. Therefore, the operator can operate one or a plurality of welding devices or hanging devices while watching the monitor, so that an improvement in welding efficiency and labor saving can be achieved. Further, even when the welding device or the like cannot imitate a groove or the like, the operator operates the welding device or the like from the control means side while monitoring the working unit such as welding on a monitor,
Work can be done.

According to the present invention, there is provided an apparatus for welding large-diameter pipes, which butt-welds large-diameter pipes with each other. A rotating device for rotating, a support pedestal passed inside the butted pipe, and a submerged arc installed on the support gantry corresponding to each butt of the pipe and welding each butt. A welding device, a suspending device installed outside of the pipe corresponding to each butt portion of the pipe, and a backside of a welded portion welded by the submerged arc welding device, and welding by the submerged arc welding device. A camera device for photographing the work unit, a camera device for photographing the hanging work unit by the hanging device, Provided with a monitor View daylight, characterized in that it comprises a control means comprising an operating unit for controlling the said submerged arc welding apparatus and chipping device.

In the above welding apparatus, the butt portion of the large-diameter pipe is welded from the inside of the large-diameter pipe by rotating the large-diameter pipe with a rotating device and operating the submerged arc welding apparatus. The back of the welded portion is suspended from the outside of the large-diameter pipe by a suspension device. Since both the submerged arc welding equipment and the lifting equipment can be operated from the control panel side,
A plurality of submerged arc welding devices and lifting devices can be operated simultaneously. Further, even when the submerged arc welding apparatus or the lifting apparatus cannot follow the groove or the like, the submerged arc welding apparatus or the lifting apparatus can be operated from the operation panel side while monitoring the working unit on the monitor.

[0016] The camera device is installed so as to be able to photograph the welded portion of each submerged arc welding device from the front and the rear. With these camera devices, the status of each welding portion can be confirmed, and one operator can simultaneously operate a plurality of welding devices while watching the image on a monitor.

In the above welding method and welding apparatus, the earthing method of the submerged arc welding apparatus is a tube body sliding type. By doing so, it becomes possible to cope with a large current, and it is possible to install a plurality of welding devices and weld a plurality of butted portions simultaneously.

In the above welding method and welding apparatus, the flux hopper of the submerged arc welding apparatus is provided with a remaining amount detecting means so that the control panel side can know the remaining amount of the flux. For example, an alarm is issued when the remaining amount of flux becomes less than a certain amount. This makes it possible for the operator to replenish the flux without constantly monitoring.

As the power source of the submerged arc welding apparatus, one having stable arc generation characteristics is employed.
In this way, since the arc is stabilized, additives such as steel wool and iron powder, which have been required in the past, become unnecessary, and the burden on the operator involved in the addition work is also eliminated.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a welding method and a welding apparatus according to the present invention will be described. 1 and 2
1 shows an entire and partial enlargement of an apparatus for performing a welding method according to an embodiment.

A plurality of large-diameter iron tubes 1a, 1b, 1c, 1d
Is welded by the rotating device 2 to be rotatably driven. The rotating device 2 is provided with a pair of rollers 4 on a base 3, and in this example, the four rotating devices 2 are arranged in parallel. The roller 4 is driven and rotated. Note that a groove (welding portion) 7 between the iron pipes of the material 1 to be welded is preliminarily grooved.

Two parallel inner rails 5 pass through the workpiece 1 supported by the rotating device 2. The rail 5 is configured as a structure, and is installed on a floor or the like by legs 5a on both sides thereof. Also, the rail 5 is provided with a jig 6 for contacting the end face of the workpiece 1 to prevent the workpiece 1 from shifting in the axial direction.

In the material 1 to be welded, a rail 8 is crossed at a position corresponding to the abutting portion 7 between the iron pipes of the inner rail 5, and a submerged arc is provided on the rails 5 and 8 constituting the support base. A welding device 11 is provided.

The submerged arc welding apparatus 11 includes a submerged arc welding machine 12, a welding power source, a flux recovery device, and the like. The submerged arc welding machine 12
A truck 13 installed on the rail 8, a copying mechanism 14 configured on the truck 13, a welding head 15 supported by the copying mechanism 14, a wire reel 16 supported on the truck 13, and a wire 16a from the wire reel 16. The welding head 1
And a control device 18 and the like. Electric current is supplied to the wire 16a from the contact tip of the welding head 15.
As a welding power source of the submerged arc welding machine 12, a power source capable of securing stable arc generation characteristics is used, and it is not necessary to add an additive such as iron powder and to operate a plurality of submerged arc welding machines 12 at the same time. Make it possible.

A flux supply nozzle 19 is provided in front of the wire supply section in the welding head 15, and a flux hopper 20 installed on the rail 5 is provided.
Is the hose 21 and the flux supply nozzle 1
9 to be supplied to the welding portion. Each flux hopper 20 is provided with weighing means for weighing the amount of flux therein.

Two television cameras (ITV cameras), which are television camera devices for photographing the welded portion, are provided for one welding device 11, and one television camera 22 is mounted on one rail 5. Another television camera 23 is supported by the flux hopper 20 on the other rail 5. That is, the welding part can be photographed from the front and the rear.

On the other hand, on the floor or the like outside the material 1 to be welded, an outer rail 31 is installed in parallel with the axial direction of the material 1 to be welded. An automatic backing device 32 is installed. The automatic back lifting device 32 includes a mechanical copying mechanism 34 in which the stylus 33 copies the butting portion 7 between the iron pipes, and a gouging torch 35. Further, a television camera 36 for photographing a hanging portion (a gouging portion) is also provided.

A ground 41 installed on the floor is pressed against the outer peripheral surface of the workpiece 1 by a spring for grounding the workpiece 1. To hold down with a spring,
It is possible to cope with bending, displacement, abrasion, etc. of the workpiece 1. The ground 41 has a capacity of, for example, 1000 A at one location.
Thus, by being able to cope with a large current, a plurality of welding machines can be operated simultaneously.

A control panel 51 is provided on the floor. The control panel 51 controls the rotating device 2, the welding device 11, and the hanging device 32, and includes an operation unit 52 and a monitor 5.
3, 54. On the monitor 53, the images from the television cameras 22 and 23 can be switched and projected, and on the monitor 54, the images from the three television cameras 36 can be switched and projected. The operator can operate the welding device 11 and the hanging device 32 by using the operation unit 52 while watching the image. The weighing means provided in the flux hopper 20 is connected to an alarm provided in the control panel, and an alarm is issued when the amount of the flux becomes less than a certain amount.

Next, a description will be given of a welding operation by the above-structured apparatus, that is, a welding method according to an embodiment of the present invention. First, the workpiece 1 is placed on the rotating device 2.
At this time, the respective butting portions 7 are designed to match the positions of the welding device 11 and the back of the hanging device 32.

Next, one or more welding devices 11 are operated to supply flux to the butting portion 7, and
An arc is generated between the wire 16a and the butt 7, and welding is started. When welding is started, the rotating device 2 is driven, and the material to be welded 1 is rotated, so that welding proceeds along the butt portion 7. The wire 16 a is supplied to the butting portion 7 by the copying operation by the copying mechanism 14. The welded portion is photographed by the television cameras 22 and 23 and is displayed on a monitor 53 of the control panel 51. Therefore, one operator can monitor the welding conditions of the plurality of welding devices 11 while watching the monitor 53 and operate the welding devices 11.

When the amount of the flux in the flux hopper 20 becomes less than a certain amount due to the consumption of the flux, it is detected by the weighing means, and an alarm is issued by an alarm on the control panel 51 side. Therefore, the operator only has to replenish the flux at that time, and it is not necessary to constantly monitor the flux amount in the flux hopper 20. The unmelted flux supplied to the welding location is recovered by a flux recovery device.

Since the welding device 11 itself can be operated from the control panel 51 side, even when there is no groove to be copied by the copying mechanism 14 such as when welding a finished layer, an operator can watch the monitors 22 and 23 while watching. Welding can be performed.

The back work is performed in the same manner. In other words, the gouging torch 35 follows the welded portion by the copying mechanism 34 of the automatic backlashing device 32, and the backside of the welded portion is suspended. At this time, in the control panel 51, the monitor 5
4 shows a hanging work section. Therefore, the control panel 51
From the side, confirmation of the position of the welded portion, positioning of the copying mechanism 34, and positioning of the gouging torch 35 can be performed by remote control. Therefore, by arbitrarily setting the arc length of the gouging torch 35, the gouging grooves can be aligned. In addition, since the operation is performed from the control panel 51 side, one worker can operate a plurality of automatic back-hanging devices 32.

After the back of the welded portion is suspended, the back is suspended by a suspension device 32.
Instead, an arc welding device is installed, and the gouging groove is welded from the outer surface of the workpiece 1. At this time, the gouging groove becomes a copying groove, and the wire is copied.

In the above embodiment, welding is started from the inside of the large-diameter pipe, but welding may be started from the outside first. Further, the present invention is not limited to the penstock, but can be applied to all welded joints between large-diameter annular members.

[0037]

According to the method of welding a large-diameter annular object according to the present invention, when the large-diameter annular objects are butt-welded to each other and welded, the butt portion of the annular object is provided inside or outside the butted annular object. A plurality of welding devices are arranged so as to be relatively movable along, while a plurality of hanging devices are installed outside or inside the annular object so as to be relatively movable along a butt portion of the annular object. The device and the hanging device can be individually controlled and a plurality of devices can be simultaneously controlled, and the welding work by the welding device, the hanging work by the hanging device are respectively taken by a television camera and projected on a monitor,
Since the welding device and the hanging device are controlled while watching the monitor, the welding of a plurality of butted portions of the large-diameter pipe can be performed simultaneously and remotely, thereby improving welding efficiency and saving labor. .

According to the apparatus for welding a large-diameter annular object according to the present invention, the annular object is welded by butt-joining the annular objects.
Installed inside or outside the butted ring,
A plurality of welding devices that are relatively movable along a butt portion of the annular member, and a hanging device that is installed outside or inside the annular member and that is relatively movable along a butt portion of the annular member, The camera device includes a camera device that captures an image of a working unit using the welding device and the lifting device, and a monitor that captures an image from the camera device, and a control unit that includes an operation unit that controls the welding device and the lifting device. Therefore, welding of a plurality of butted portions of a large diameter pipe can be performed simultaneously and by remote control, thereby improving welding efficiency and saving labor.

According to the large diameter pipe welding apparatus according to the present invention, a large diameter pipe is butt welded with each other, and a rotating device for supporting the butted pipe and rotating the pipe is provided. A support pedestal passed through the inside of the butted pipe, a submerged arc welding device installed on the support pedestal corresponding to each butt of the pipe, and welding each butt, On the outside of the pipe, a suspending device that is installed corresponding to each butt portion of the pipe, and that the back of the welded portion welded by the submerged arc welding device is suspended.
A camera device for photographing the welding work unit by the submerged arc welding device, a camera device for photographing the hanging work unit by the hanging device, and a monitor for photographing images by both camera devices, and the submerged arc welding device and And control means having an operation unit for controlling the lifting device, so that a plurality of submerged arc welding devices and the lifting device can be operated from the control means side, thereby improving efficiency and improving operator Burden is reduced. Since the working state of the submerged arc welding device and the lifting device can be checked on the monitor, the quality of the welded portion can be improved, and even when the submerged arc welding device and the lifting device cannot follow the groove or the like, The submerged arc welding device and the hanging device can be operated from the operation panel side while monitoring the working unit on the monitor, and the working efficiency can be improved in this aspect as well.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of an example of a welding apparatus for performing a welding method for a large-diameter annular object according to the present invention.

FIG. 2 is a partially enlarged view of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 To-be-welded material 1a, 1b, 1c, 1d Iron pipe 2 Rotating device 4 Roller 5 Inner rail 6 Displacement prevention jig 7 Butting part 8 Rail 11 Submerged arc welding device 12 Submerged arc welding machine 13 Dolly 14 Copying mechanism 15 Welding head 16 Wire Reel 16a Wire 18 Control device 21 Flux hopper 22 TV camera 23 TV camera 31 Outer rail 32 Automatic back suspension device 34 Copying mechanism 41 Ground 51 Control panel 53 Monitor 54 Monitor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location B23K 37/08 B23K 37/08 E // B23K 101: 06 (72) Inventor Mitsuo Masaoka Kobe, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd. Kobe branch office (72) Inventor Takamasa Ishii 5-6-1, Komatsu-dori, Hyogo-ku, Kobe city, Hyogo prefecture Mitsubishi Heavy Industries, Ltd. Kobe branch office

Claims (4)

[Claims] When a large-diameter annular member is butt-welded to each other, a plurality of welding devices are arranged inside or outside the butted annular member so as to be relatively movable along a butt portion of the annular member. On the other hand, a plurality of lifting devices are installed on the outside or inside of the annular member so as to be relatively movable along the butt portion of the annular member, and these welding devices and the hanging devices can be controlled individually and simultaneously. Welding of the large-diameter annular object, wherein the welding work by the welding device and the hanging work by the hanging device are respectively taken by a television camera and projected on a monitor, and the welding device and the hanging device are controlled while watching the monitor. Construction method. 2. The torch portion of the welding device and the lifting device, wherein the large-diameter annular member is rotated, and the butting portion of the rotating large-diameter annular member is fixed.
The method for welding a large-diameter annular object according to the above. 3. An apparatus for welding large-diameter annular objects by butt-welding each other, wherein the apparatus is installed inside or outside the butted annular objects,
A plurality of welding devices that are relatively movable along a butt of the annular object, and a hanging device that is installed outside or inside the annular object and that is relatively movable along the butt of the annular object, A television camera device that captures an image of a working unit using the welding device and the lifting device, and a control unit that includes a monitor that captures an image from the television camera device and that includes an operation unit that controls the welding device and the lifting device. An apparatus for welding large-diameter annular objects, characterized by the following. 4. An apparatus for butt welding large-diameter pipes together, the apparatus supporting the butted pipe and rotating the pipe, and is passed through the inside of the butted pipe. A support gantry, a submerged arc welding device installed on the support gantry corresponding to each butt portion of the pipe, and for welding each butt portion; outside the pipe, at each butt portion of the pipe, A suspending device that is installed correspondingly and performs backlashing of a welded portion welded by the submerged arc welding device; a television camera device that captures an image of a welding working portion by the submerged arc welding device; A television camera device for photographing the camera, and a monitor for photographing images by the two camera devices, and the sub camera Welding device having a large diameter annular material, characterized in that it comprises a control means comprising an operating unit for controlling the Jiaku welding apparatus and chipping device.