JPH03275275A - Pipe joining welding equipment - Google Patents

Abstract

PURPOSE:To form a faultless joint part having a satisfactory bead by fitting a carriage to a pedestal in welding of a system to rotate the welding head side of a butt joint of fixed pipes in opposition. CONSTITUTION:In the pipe joining welding equipment provided with a holding device 31 to hold pipes 1 and 2 to be joined by a separable holding member and the carriage 51 to hold the welding head 61 and rotate around the pipes, the carriage 51 is fitted to the pedestal 21 so that the weights of the welding head 61 and the carriage 51 are not added to the pipes to be joined and further, a pipe holding pert is also fitted to the pedestal together with the carriage 51 and the relative position between the pipe holding part and a torch ie kept accurately and deflection of the torch tip is prevented for the intense movement of the welding head 61. Consequently, a faultless pipe joining weld zone having the satisfactory bead can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a device for joining opposing pipes by circumferential welding of a butt joint or a sleeve joint, and is particularly suitable for work environments where the pipes cannot be rotated. The present invention relates to a pipe joint welding device that rotates the welding head when the welding head is rotated.

The invention is utilized for joining relatively small diameter and long tubes that are fixed or supported.

[Prior Art] When joining pipes at a construction site, high-tensile Holt joints may not provide sufficient airtightness, so welding joints may be required. Furthermore, if the tube is long, the end of the tube is already fixed, or the tube is wound around a bobbin, once the tubes are joined, the joining device may not be able to be removed from the joined pipe. Therefore, the joining device has a split structure and is assembled by straddling the pipes before starting the joining operation. When the joining work is completed, the joining device is disassembled and removed from the pipe.

Conventional pipe joining equipment includes a split weld head guide rail that is screwed and secured directly near the ends of the pipes to be joined. The welding head runs on the welding head guide rail. FIG. 4 shows an example of a conventional pipe circumference welding device. A guide rail 92 that guides a welding head rotating cart 91 and its support mechanism 93 are installed directly on the pipe 1 to be joined. As such pipe joint welding equipment, for example, Japanese Patent Publication No. 58-8949, Japanese Patent Publication No. 58-280
299, JP 5835075, JP 59-5314
7, Utsukai Sho 58-fi] 36. fi9, Utsukai Showa 59-
There are devices disclosed in JP-A No. 62883, JP-A-59-39479, and JP-A-62-158590.

[Problems to be Solved by the Invention] The conventional pipe welding apparatus described above is suitable when the outer diameter of the pipe and the size of the welding head are balanced both in shape and weight. For large diameter pipes, there are commercially available welding devices equipped with automatic welding devices. Furthermore, for small diameter pipes with a pipe diameter of about 10 mm, there is an apparatus for joining the pipes by tick welding using a small welding head exclusively for small diameter pipes. These welding devices can be used if they have sufficient rigidity or strength to support the weight of the pipe or welding head, and have a structure that prevents the tip of the torch from swinging as the welding head moves during welding. It becomes.

If there is an excellent welding machine available on the market and the welding head of this machine can be used for joint welding of pipes, the development period for the welding l\foot can be greatly shortened, and the development cost can also be significantly reduced. However, if the welding head is heavy compared to the size of the pipe, the conventional method of directly applying the weight of the welding head to the pipe causes the pipe to sag or become stiff due to the weight of the welding head. When the tube is bent or strained, the movement of the groove and the movement of the welding torch tip become relatively irregular, making it difficult for the welding torch to accurately target the position within the groove. As a result, there was a problem in that a good welded joint could not be obtained.

The present invention provides a pipe joining and welding device that can use a commercially available welding machine and can perform circumferential welding of small diameter pipes even with a heavy welding head.

[Means for Solving the Problems] A pipe joining and welding device of the present invention includes a pipe holding device that holds one of the pipes to be joined by a separable gripping member, a welding head, and a welding head that holds the welding head, and which holds the welding head around the pipe. A tube joining and welding device equipped with a rotating carriage includes a pedestal supporting a tube holding device, and a bisected circular guide fixed to the pedestal and having a tube insertion hole in the center. Further, the carriage includes a rotating disc mounted with a welding head and having a tube insertion hole in the center, and a circumference of the circular guide, which is attached to the surface of the rotating disc so as to be lined up in the circumferential direction. It consists of multiple rollers that roll on a surface.

The rotating disk is composed of two semi-disks, and the welding head is fixed to one of the semi-disks. Each semicircular disk has a semicircular opening 1 concentric therewith, and when the two semicircular disks are butted together, a tube insertion hole is formed. Rotating disks are motors and gears,
Rotationally driven by a transmission mechanism such as a belt or chain.

The circular guide is also composed of two semicircles.

Each semicircular disk has a semicircular opening concentric therewith, and when the two semicircular disks are butted together, a tube insertion hole is formed.

The number of rollers is approximately 4 to 8 or appropriate.

When the outer periphery of the circular guide is formed into a chevron shape, and the roller is a grooved roller that fits into the chevron shape, the rotating disk is reliably held by the circular guide.

A saddle may be removably attached to the top of the mount (-1), and a connecting pin may be provided to removably connect at least one semicircular disk constituting the rotating disk and the circular guide or saddle. , the cart on which the pedestal is mounted may be provided with a pivot shaft that rotatably supports the pedestal around a vertical axis.The pivot shaft is located on the center of gravity of the pedestal on which the circular guide, carriage, etc. are mounted. .

[Operation] A rotary disk is rotatably supported by a circular guide fixed to a frame, and a carriage that holds a welding head is supported on this rotary disk. Therefore, the weight of the welding head and carriage is not added to the tubes to be joined.

For devices with a saddle, when the device is disassembled, a connecting pin is fitted into the saddle or the semicircular guide located above the semicircular guide. Then, when you lift the saddle, you will see a semicircular disk located on the second side of the circular guide, a roller,
The half disk and welding head located above the rotating disk can be separated from the mount together with the saddle while remaining integral.

Furthermore, a device in which the truck is provided with the pivot shaft is advantageous when connecting pipes via sleeves. That is, once welding of one tube and one end of the sleeve is completed, the upper portion of the device that passes through the tube is removed. Then, when the frame is rotated 180 degrees around the pivot axis, the welding head automatically assumes a position in which the other tube and the other end of the sleeve can be welded even if the torch is inclined with respect to the tube axis.

[Example] (First Example) Figures 1 and 2 show an example of this invention.
FIG. 2 is a side view and a front view of the pipe joint welding device, respectively.

The pipe joining and welding device mainly uses a trolley 11. It consists of a pedestal 2L tube holding device 31, a circular guide 4], a carriage 5], a welding head 61, and a carriage drive device 71.

The truck 1 is provided with a pivot shaft 14 at the center of the upper surface of the frame 12 and a support shaft 15 at the periphery. In addition, wheels 17 and supporting legs 18 are provided on the lower surface of the frame 12.
is provided.

The pedestal 21 has a first stand 23 and a second stand on a base 22.
Stands 26 are provided to face each other. A saddle 28 is detachably attached to the top of the first stand 23. The pedestal 21 is supported on the truck 11 by the pivot shaft 14 and the support shaft 15.

The tube holding device 31 includes a first gripping metal 32 and a second gripping metal 33 fixed on the first stand 23 and the second stand 26, respectively. Each gripping metal fitting 32.
33 is separable into upper and lower parts, and the upper part has a presser metal fitting 35,
The lower side is a V block 36. First gripping fitting 32
The presser metal fitting 35 is attached to the saddle 28.

The first gripping metal fitting 32 holds one tube 1 to be joined, and the second gripping metal fitting 33 holds the other tube 2.

The circular guide 41 is divided into two parts, consisting of two semicircular disks 42 and 43, and the upper semicircular disk 42 is connected to the saddle 2.
8, and the lower half disk 43 is fixed to the main body 24 of the first stand 23. Each semicircular disk 42.43 is provided with a semicircular hole 45, and when the two semicircular disks 42.43 are brought together, a tube insertion hole 45 is formed. Further, the outer periphery of the circular guide 41 has a chevron shape.

The carriage 51 includes a rotating disk 52 divided into two. The two semicircular disks 53 and 54 forming the rotating disk 52 each have a semicircular hole 55 on the right side, and when the two semicircular disks 53 and 54 are brought together, a tube insertion hole 56 is formed.

Furthermore, two rollers 57 are provided on the surface of each semicircular disk 53,54. The roller 57 is connected to the circular guide 41
It has a groove 58 that fits into the chevron shape. These four rollers 57 fit into the circular guide 41 so as to embrace it, and the rotating disk 52 engages the circular guide 41.
can be attached to.

The welding head 6] is attached to the rotating disk 52 using a metal fitting 72.
It is fixed to one of the semi-discs.

The carriage drive device 71 moves the main body 2 of the first stand 23
Motor 72 and belt transmission mechanism 7 installed in 4
3. It consists of a pinion 76 fixed to a driven shaft 74 of a belt transmission mechanism 73. The pinion 76 is a rotating disk 52
It is designed to mesh with teeth 59 cut on the outer periphery of.

A method for joining and welding mild steel pipes having an outer diameter of 8 mm and an inner diameter of 3 mm via a sleeve using the apparatus configured as described above will be described. The sleeve has an outer diameter of 11 mm and an inner diameter of 8.
1 mm and length [100n+n+.

One half-disk 53 of a rotary disk 52 is fixed to the upper half-disk 42 of a circular guide 41 mounted on a saddle 28. To fix the semicircular disk 53 of the rotating disk 52, insert the connecting pin 81 that passes through the semicircular disk 53 into the hole of the circular guide 41.
(not shown). Then, leave the saddle 28 removed. Therefore, the presser metal fitting 35 integrated with the saddle 28 and the semicircular disc 53 above the rotating disc 52 are also removed. Further, the lower semi-disk 54 of the rotating disk 52 is engaged with the pinion 76 and fixed. The fixing method is to insert the connecting pin 81 that passes through the semicircular disk 54 into the hole of the circular guide 41 in the same manner as described above.

The ends of the sleeve 5 are inserted into the tips of the tubes 1 and 2, respectively. Then, the tube 1 is fixed with the first gripping metal fitting 32, and the tube 2 is fixed with the second gripping metal fitting 33. These fixations are for saddle 2
8 to the main body 24 of the first stand 23 with the clamp 38, and the second gripping fitting 33 is tightened to the clamp 3.
It can be fixed by tightening with 9. One attitude of the torch 62 is adjusted by the torch position adjuster 67 so that the tip of the torch 62 aims at the end face of the sleeve 5 at an angle of 45 degrees.

In this state, the welding head 61 arc welds the corner of the sleeve joint, aiming at the end face of the sleeve 5. The groove aiming angle is 45°. The joining procedure is to look at the welded joint from the front and first make temporary connections at 12 o'clock, 6 o'clock, 3 o'clock, and 9 o'clock.

Next, after returning the welding head 61 to its origin at 12:00, regular welding is performed.

The welding work is program-controlled by a control panel 83.

To give an example of welding conditions, the welding machine is an inverter plasma welding machine 120A type, and the plasma torch has an electrode diameter of 1.
．． 6 mm, plasma emission orifice diameter is 1.6 m
It is m. Ar is used as the pilot gas, and the flow rate is 0.
．． 1°C/min. Also, the shield scum has tithe and l.
A 1:1 volume mixture of l e is used, and the flow rate is 7 floods/mi.
It is n. Base current is 100A, peak current is 120A
A, average current is 110A, pulse width is 50%, pulse frequency is 500 Hz, arc voltage is 25V.

When welding of one end of the sleeve 5 is completed, the upper holding metal fitting 35 of the first gripping metal fitting 32 is loosened. rotating disk 5
2 is rotated 180 degrees, and the semicircular disk 54 located on the lower side is positioned on the upper side. Next, the connecting pin 81 is inserted into the hole of the saddle 28. In this state, when the clamp 38 of the saddle 28 is loosened and the saddle 28 is lifted, the restraining portion of the tube 1 can be removed at once while the semicircular disc 54 is still connected.

Since the semicircular disk 53 to which the welding head 61 is attached is located below, the removed load is correspondingly lighter. Next, remove the stopper 29 and move the pedestal 21 around the pivot support 14.
Rotates 106 times. At this time, raise the tube 1 slightly to avoid getting caught in the recessed part of the flock 36.

After moving along the pipe 1 using the trolley 11, fixing the rough position and stopping the trolley 1, and attaching the saddle 28, the user can immediately enter the welding position. Even if the torch 62 is inclined with respect to the tube axis, the welding head 61 automatically assumes a position in which the tube 1 and the other end of the sleeve 5 can be welded.

To separate the device from pipe 1 after the joint welding is completed,
Tightening the split portions of the tube penetrations of the device involves removing the tool and removing the respective upper portions. At this time, if the saddle 28, the semicircular disk 42 of the circular guide 41, and the semicircular disk 53 of the rotating disk 52 are separated, the weight of the welding head 61 and the attached cabtire cable will be added when assembling the device, and the roller 57 into the circular guide 41 is difficult. Semi-disc 4 on the upper side of the circular guide 41
2 and the upper half disk 53 of the rotating disk 52 are separated while rotating each other, so if this rotational movement is stopped, separation can be prevented. The connecting bin 81 stops this rotational movement and prevents the two from separating.

Sleeving the tube 1.2 causes the torch 62 to be aimed at the sleeve end, often at an oblique angle rather than perpendicular to the tube wall. Therefore, after welding one end of the sleeve 5, the fixation of the tube 1 is loosened and the device is moved in parallel.
It is necessary to newly change the setting position and setting angle of l.-chiro 2, making it difficult to obtain stable welding conditions for work reproducibility and stability. However, by rotating the frame by 180 degrees as described above, it becomes unnecessary to reset 1.-chiro 2.

(Second Embodiment) 4 FIG. 3 shows another embodiment of the present invention. The welding means was plasma welding in the first embodiment, or YAG laser in this embodiment.

Note that devices and units similar to those in the above embodiment are given the same reference numerals, and their explanations will be omitted.

The welding energy is a minute spot laser beam produced by guiding a YAG laser emitted from a YAG rod through an optical fiber 85 and focusing it at an output optical section 86.

The operating procedure is the same as in Example 1. Note that the output optical section 86 is irradiated with a 360-degree rotational laser beam. Therefore, it is desirable for safety to install a laser beam shielding device in order to prevent the laser beam from being irradiated onto parts other than the welded part.

With a device configured as shown in L, an outer diameter of 1.2 mm,
A method of joining and welding 5115340 stainless steel pipes with an inner diameter of 0.8 mm through a sleeve will be described.

The sleeve has an outer diameter of 1.5 mm, an inner diameter of 3 mm, and a length of 500 mm.

The YAG laser welding conditions were a laser output of 2 joules/pulse, a pulse repetition rate of 5 pulses/second, and a focal ratio of 11,150 mm for the output optical section, and the processing point was finished with just focus. The core diameter of the optical fiber that guides the laser is 300 mm.
μm, and the laser irradiation angle to the processed part is 45°. The welding speed was 4 seconds per revolution to complete circumferential welding, and there were 20 spot welds all around the circumference. The pulse was controlled to start at the same time as the rotation and end at the same time as one rotation. The procedure after removing the pipe restraint portion and rotating the pedestal 21 by 180° is the same as in the first embodiment.

Even when the camera 89 of the television monitor for monitoring the joint was mounted on the rotating disk 52, the deflection of the tip of the torch 62 could be suppressed to a size that did not interfere with the joint welding.

This invention is not limited to the above embodiments. For example, if one of the tubes 2 to be joined is already fixed to something, the second stand 26 and the second tube holding device 31 are unnecessary. Further, when butt welding the pipes 1 and 2 to be joined, the torch 62 is perpendicular to the pipe axis, so there is no need for the frame 21 to have a structure capable of rotating 180 degrees around the vertical axis.

[Effects of the Invention] In the present invention, since the carriage is attached to the frame, the weight of the welding head and carriage is not added to the pipes to be joined. Therefore, even when the welding head moves violently, the tip of the joint can be prevented from swinging. Furthermore, since the tube holding section is also attached to the pedestal together with the carriage, the relative position of the tube joint and the torch can be maintained accurately. As a result, a pipe joint welded portion with a good bead and no defects can be obtained. In addition, it is possible to improve the reproducibility of returning to a predetermined position while maintaining the accuracy of the torch rotational movement angle, and it has become possible to repeat rotational movement welding under an automated software block.

When the device is equipped with a saddle, when the device is disassembled, the saddle, the upper circular guide, the rollers, the upper rotating disk, and the welding head can be separated from the bottom of the device all at once while remaining integrated. Also,
For equipment equipped with a pivot shaft on the cart, after welding one end of the tube and the sleeve, rotate the stand 180° around the pivot shaft to align the torch and groove, and the torch will align with the tube shaft. Even if the welding head is tilted or tilted, the welding head will automatically be in a position where it can weld the other tube and the other end of the sleeve. Therefore, there is no need to readjust the angle of the torch with respect to the tube axis, and welding can be performed with good reproducibility without much effort under the same conditions as before. As a result, the efficiency of pipe joining work can be improved.

As is clear from the above, the present invention exhibits remarkable effects when it is necessary to precisely adjust the position of the joint and the welding head when joining small diameter pipes.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, in which a side view of a pipe joining and welding device, FIG. 2 a front view of the device shown in FIG. 1, and FIG.
The figures show another embodiment of the present invention, and are a side view of a pipe joining and welding device, and FIG. 4 is a front view of a conventional pipe joining and welding device. 1.2...pipe, 5...sleeve, 11...truck,
12... Frame, 14... Pivot axis, 2]...
- Frame, 23... First stand, 26... Second stand, 28... Saddle, 31... Tube holding device, 32
...First tube gripping fitting, 33...Second tube gripping 7 8 metal fitting, 41...Circular guide, 42.43...Semi-disk, 46...Tube bullet hole, 51...Carriage , 52・
...Rotating disk, 53.51...Semi-disc, 56...Tube insertion hole, 57...Roller, 58...Teeth, 61...
- Welding head, 62... Torch, 71... Carriage drive device, 72... Motor, 73... Belt transmission mechanism, 76... Pinion, 81... Connection pin, 8
3... Control panel, 85... Optical fiber cable, 86
...Emission optical section.

Claims (1)

[Claims] 1. A pipe joining and welding device comprising a pipe holding device that holds one of the pipes to be joined by a separable gripping member, a welding head, and a carriage that holds the welding head and rotates around the pipe. , comprising a pedestal supporting the tube holding device, and a bisected circular guide fixed to the pedestal and having a tube insertion hole in the center, the carriage mounting the welding head and having the tube insertion hole in the center. A pipe joining and welding device comprising a two-split rotating disk, and a plurality of rollers that are attached to the disk surface of the rotating disk so as to be lined up along the circumferential direction and roll on the circumferential surface of the circular guide. 2. A saddle is removably attached to the top of the mount, and a connecting pin is provided to removably connect at least one semicircular disk constituting the rotating disk and the circular guide or the saddle. 1. The pipe joint welding device according to 1. 3. The pipe joining and welding apparatus according to claim 1 or 2, further comprising a truck on which the pedestal is mounted, and a pivot shaft for rotatably supporting the pedestal around a vertical axis is provided on the truck.