JP2021194683A - Circumferential welding device for tube material - Google Patents

Abstract

To provide a circumferential welding device for a tube material that when joining a stub tube which is a tube material to a header of a boiler can perform circumferential welding even if a vicinity of a weld zone is curved.SOLUTION: A circumferential welding device, which circumferential-welds a weld zone Wd of a tube material W2, comprises a welding torch T that circles around the tube material W2 while pointing to the weld zone Wd of the tube material W2; a torch support part 3 that supports the welding torch T; and a gripping part 5 that fixes the torch support part 3 to the tube material W2. The gripping part 5 fixes the torch support part 3 to the tube material W2 so that a center of circulation of the welding torch T and a shaft center of the tube material W2 are coaxial with each other.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to, for example, a circumferential welding device for a pipe material used for joining a stub pipe, which is a pipe material, to a boiler pipe by welding. The pipe material shall also include a solid bar material.

Conventionally, as a device similar to the above-mentioned circumferential welding device for pipe materials, for example, there is a circumferential welding device described in Patent Document 1.
The circumferential welding device described in Patent Document 1 includes a welding head fixed to a pipe material, and a welding torch attached to the welding head and swiveling around the pipe material.

Japanese Unexamined Patent Publication No. 58-163592

However, in the above-mentioned circumferential welding device, if the vicinity of the welded portion of the pipe material fixing the welding head is linear, the circumferential weld can be performed without any problem, but the vicinity of the welded portion is curved. In this case, since the turning center of the welding torch coaxial with the welding head fixed to the curved portion is tilted from the axis of the welding portion, there is a problem that circumferential welding cannot be performed, which is solved. Has been a conventional issue.

The present disclosure has been made to solve the above-mentioned conventional problems. For example, in the case of joining a stub pipe, which is a pipe material, to the pipe fitting of a boiler, even if the vicinity of the welded portion is curved, it is a circle. It is an object of the present invention to provide a circumferential welding device for pipe materials capable of performing circumferential welding.

The first aspect of the present disclosure is a circumferential welding device that circumferentially welds a welded portion of a pipe material, the welding torch that swirls around the pipe material while facing the welded portion of the pipe material, and the above. A torch support portion that supports the welding torch and a grip portion that fixes the torch support portion to the pipe material are provided. The torch support portion is configured to be fixed to the pipe material.

In the second aspect of the present invention, the grip portion has a first gripping part that grips a straight line portion continuous with a straight line portion of the pipe material in which the weld torch swivels, and a straight line in which the weld torch of the pipe material swivels. It is configured to include a second gripping part that grips a curved portion continuous with the portion or a straight portion in a direction different from the straight portion in which the welding torch turns.

In the third aspect of the present disclosure, the grip portion is continuous with a state of gripping a straight line portion continuous with a straight line portion of the pipe material in which the welding torch swivels, and a straight line portion of the pipe material in which the welding torch swivels. The configuration corresponds to either a curved portion or a state in which a straight portion in a direction different from the straight portion in which the welding torch turns is gripped.

A fourth aspect of the present disclosure is such that the gripping portion grips a straight line portion continuous with the straight line portion of the pipe material to which the welding torch swivels.

A fifth aspect of the present disclosure is such that the gripping portion grips a curved portion continuous with a straight line portion in which the welding torch of the pipe material turns.

A sixth aspect of the present disclosure is such that the gripping portion grips a straight line portion in a direction different from the straight line portion continuous with the straight line portion in which the welding torch of the pipe material turns.

A seventh aspect of the present disclosure is configured to include a slide mechanism for moving the welding torch in the axial direction of the pipe material.

In the eighth aspect of the present disclosure, the torch support portion is configured to be attached to the grip portion via a detachable mechanism.

According to the circumferential welding device for pipe materials according to the present disclosure, for example, when joining a stub pipe, which is a pipe material, to the pipe gathering of a boiler, it is possible to perform circumferential welding even if the vicinity of the welded portion is curved. It has a very good effect of being.

It is a front explanatory view of the circumferential welding apparatus of the pipe material which concerns on one Embodiment of this disclosure. It is a side side explanatory view of the circumferential welding apparatus of the pipe material shown in FIG. It is a perspective explanatory view of the circumferential welding apparatus of the pipe material shown in FIG. It is a partially enlarged perspective explanatory view of the head drive mechanism in the circumferential welding apparatus of the pipe material shown in FIG. It is a partially enlarged perspective explanatory view of the attachment / detachment mechanism of the gripping portion in the circumferential welding apparatus of the pipe material shown in FIG. 1. It is a front explanatory view when the alternative grip part in the circumferential welding apparatus of the pipe material shown in FIG. 1 is used. It is a partially enlarged explanatory view of the grip part in the circumferential welding apparatus of the pipe material which concerns on other embodiment of this disclosure. It is a partially enlarged explanatory view of the grip part in the circumferential welding apparatus of the pipe material which concerns on still another Embodiment of this disclosure.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
1 to 6 show a circumferential welding device for a pipe material according to an embodiment of the present disclosure. In this embodiment, the case where the circumferential welding device for the pipe material of the present disclosure is a welding device for joining a stub pipe, which is a pipe material, to the pipes of a boiler by welding.

As shown in FIGS. 1 and 2, the circumferential welding device 1 of this pipe material is a welding device for joining a stub pipe W2 to a pipe gathering W1 by circumferential welding, and is a welding device main body 2 having a built-in control unit. A head support portion 3 connected to the welding apparatus main body 2, a welding head portion 4 supported by the head support portion 3, and a grip portion 5 for fixing the welding apparatus main body 2 to the stub tube W2 are provided.

The welding apparatus main body 2 controls the electricity, shield gas, and cooling water supplied from a supply source (not shown) to a set amount, respectively, and has a welding head portion from the outlets 21, 22, 23 via cables C1, C2, and C3. It is designed to be supplied to the 4 side. Further, the welding device main body 2 is provided with a wire feeding device (not shown) that feeds the filler wire to the tip holder CH (only the tip portion is shown in FIG. 1) on the welding head portion 4 side.

The head support portion 3 has a plate shape, and its base end 31 is connected to the welding apparatus main body 2. As shown in FIG. 3, the head support portion 3 has a pipe fitting hole 32 at the center, which is fitted with the stub pipe W2 with a margin in a state where the welding device main body 2 is fixed to the stub pipe W2 by the grip portion 5. It is provided in a portion, and a pipe insertion port 33 continuous with the pipe fitting hole 32 is formed at the tip thereof.

The welding head portion 4 has a disk 41 arranged so as to be overlapped on the lower side in the drawing with respect to the plate-shaped head support portion 3. Similar to the head support portion 3, this disk 41 also has a pipe fitting hole 42 in the central portion that fits the stub pipe W2 with a margin in a state where the welding device main body 2 is fixed to the stub pipe W2 by the grip portion 5. In addition, it has a pipe insertion port 43 that is continuous with the pipe fitting hole 42.

The disk 41 of the welding head portion 4 suspends and holds the welding torch T so that the angle can be adjusted, and also suspends and holds the above-mentioned tip holder CH. Cables C1, C2, and C3 are attached to the welding torch T. Electricity, shield gas, and cooling water are supplied to the tip holder CH, respectively, and the filler wire is supplied to the chip holder CH.

In this case, as shown in FIG. 4, an arcuate gear 62 having external teeth 61 constituting the head drive mechanism 6 is fixed to the edge of the pipe fitting hole 42 on the upper surface of the disk 41 of the welding head portion 4 as shown in FIG. On the other hand, an arcuate groove 34 that is movably fitted with the arcuate gear 62 on the disk 41 is formed around the pipe fitting hole 32 of the head support portion 3, and the head drive mechanism. It has a built-in pinion driven by a motor (not shown) that constitutes 6.

That is, by supporting the disc 41 of the welding head portion 4 with a thrust bearing (not shown) in the head support portion 3, and then engaging the pinion of the head support portion 3 with the arcuate gear 62 of the disc 41 of the welding head portion 4. The disk 41 of the welding head portion 4 can be rotated along the pipe bearing hole 32 of the head support portion 3 by the output of the motor.

That is, the welding torch T and the tip holder CH suspended and held by the disk 41 of the welding head portion 4 can be swiveled around the stub pipe W2 by the output of a motor (not shown).

The grip portion 5 includes two half-split rings 51 and 52, and grips the stub pipe W2 by sandwiching the stub pipe W2 between these half-split rings 51 and 52 and connecting both ends with screws. It has become a thing.

As shown in FIG. 5, the grip portion 5 has a connecting block (first gripping part) 53 fixed on one of the half-split rings 52 (front of the drawing), and is half of the connecting block 53. A connecting groove 53a constituting the attachment / detachment mechanism is formed at the tip protruding from the split ring 52. On the other hand, the main body side connecting block 24 is arranged on the upper surface of the welding device main body 2, and the main body side connecting block 24 is formed with the connecting groove 53a of the connecting block 53 and the connecting protrusion 24a constituting the attachment / detachment mechanism. ing.

In the grip portion 5, the fixing screw 54 constituting the attachment / detachment mechanism in which the connecting protrusion 24a of the main body side connecting block 24 in the welding device main body 2 is inserted into the connecting groove 53a of the connecting block 53 and the tip protrudes into the connecting groove 53a is provided. By tightening, the welding apparatus main body 2 and the welding head portion 4 supported by the welding apparatus main body 2 are fixed to the stub pipe W2.

In this embodiment, as shown in FIG. 6, the circumferential welding device 1 of the pipe material includes a connecting block (second gripping part) 53A having a bent portion 53c as an alternative part of the connecting block 53 in the grip portion 5. ing. This connecting block 53A is used when performing circumferential welding of a type of stub pipe W2A that curves at a position close to the welded portion Wd.

The connecting block 53A having the bent portion 53c is tilted when the curved portion of the stub tube W2A is gripped by the half split rings 51 and 52, that is, when the half split rings 51 and 52 are tilted with respect to the horizontal plane. Is offset by the bent portion 53c so that the welding apparatus main body 2 and the welding head portion 4 supported by the welding apparatus main body 2 can be horizontally fixed.

That is, even when performing circumferential welding of a type of stub pipe W2A that curves at a position close to the welded portion Wd, the stub pipe W2A is suspended from the disk 41 of the weld head portion 4 centering on a linear portion near the welded portion Wd. The weld torch T and the tip holder CH held down can be swiveled.

Here, the center of rotation of the welding torch T and the tip holder CH that swivels around the stub tube W2 (straight line portion of W2A) and the stub tube W2 (W2A) are aligned in the depth direction of FIG. When the fixing screw 54 is tightened by inserting the connecting protrusion 24a of the main body side connecting block 24 of the welding device main body 2 into the connecting groove 53a of the connecting block 53 (53A), the handle 25 arranged in the welding device main body 2 is held. It is designed to be done.

In this embodiment, as shown in FIG. 3, a slide mechanism 8 is arranged between the welding device main body 2 and the head support portion 3. The slide mechanism 8 mainly consists of a guide 81 formed on the side wall of the welding device main body 2 in the vertical direction and a slider 82 that moves up and down along the guide 81 by the power of a motor built in the welding device main body 2. By attaching the base end 31 of the head support portion 3 to the slider 82, the head support portion 3 is horizontally moved in the vertical direction together with the welding head portion 4 by the power of the motor to adjust the position in the vertical direction. I am trying to be able to do it.

In the pipe material circumferential welding device 1 according to this embodiment, when the stub pipe W2 is joined to the pipe gathering W1 by circumferential welding, first, the groove of the stub pipe W2 is formed at the stub pipe mounting position of the pipe gathering W1. Temporarily attach the welded end.

Next, the stub tube W2 is sandwiched between the two half-split rings 51 and 52 of the grip portion 5 and both ends are connected to each other by screws, so that the stub tube W2 is gripped by the grip portion 5.

After that, the connecting projection 24a of the main body side connecting block 24 of the welding device main body 2 is inserted into the connecting groove 53a of the connecting block 53 in the grip portion 5, and the fixing screw 54 is tightened in this state to form the welding device main body 2 and this. The welding head portion 4 supported by the stub pipe W2 is fixed to the stub pipe W2.

FIG. 1 shows the turning center of the welding torch T and the tip holder CH that swivel around the stub pipe W2 by holding the handle 25 of the welding apparatus main body 2 and the stub pipe W2 when the fixing screw 54 of the grip portion 5 is tightened. Align in the depth direction.

Next, the slide mechanism 8 is operated to move the welding head portion 4 supported by the head support portion 3 in the vertical direction together with the slider 82, and the angle of the welding torch T of the welding head portion 4 is adjusted at an appropriate position.

After adjusting the angle of the welding torch T, when a switch (not shown) is turned on, the control unit of the welding apparatus main body 2 starts supplying electricity, shield gas, and cooling water to the welding head portion 4, and the filler. Feeding of the wire to the welding head portion 4 side is started, and the welding torch T and the chip suspended and held by the disk 41 of the welding head portion 4 by the output of the motor of the head drive mechanism 6 also commanded by the control unit. The holder CH starts turning around the stub tube W2, and circumferential welding is performed.

Further, in the pipe material circumferential welding device 1 according to this embodiment, when a stub pipe W2A of a type curved at a position close to the welded portion Wd is joined to the pipe gathering W1 by circumferential welding, the stub pipe of the pipe gathering W1 is joined. After temporarily attaching the end portion where the groove of the stub tube W2A is formed to the mounting position, the second gripping part having the bent portion 53c is used as a substitute part for the connecting block 53 which is the first gripping part of the gripping portion 5. A certain connecting block 53A is fixed to the half-split ring 52.

Next, the curved portion of the stub tube W2A is sandwiched between the two half-split rings 51 and 52 of the grip portion 5, and both ends are connected to each other by screws, so that the stub tube W2A is gripped by the grip portion 5.

After that, the connecting projection 24a of the main body side connecting block 24 of the welding device main body 2 is inserted into the connecting groove 53a of the connecting block 53A in the grip portion 5, and the fixing screw 54 is tightened in this state to form the welding device main body 2 and this. The welding head portion 4 supported by the stub pipe W2A is fixed to the stub pipe W2A.

At this time, the two half-split rings 51 and 52 of the grip portion 5 are tilted with respect to the horizontal plane, but since the bent portion 53c of the connecting block 53A offsets this tilt, the welding device main body 2 and the welding device main body 2 and the bending portion 53c cancel the inclination. The supported welding head portion 4 will be fixed horizontally.

After that, as in the case of circumferential welding of the stub tube W2, the linear portion of the stub tube W2A and the turning center of the welding torch T and the tip holder CH are aligned in the depth direction in FIG. The angle of the welding torch T of the portion 4 is adjusted to start circumferential welding.

In the pipe material circumferential welding device 1 according to this embodiment, the grip portion 5 includes a connecting block 53 which is a first grip part and a connecting block 53A which is a second grip part having a bent portion 53c. There is.

That is, as in the case of circumferential welding of the stub tube W2, the welding torch T suspended and held by the disk 41 of the welding head portion 4 and the tip holder CH grip the linear portion continuous with the linear portion of the swivel stub tube W2. If this is the case, it can be handled by adopting the connecting block 53 of the grip portion 5.

On the other hand, as in the case of circumferential welding of the stub tube W2A, the welding torch T suspended and held by the disk 41 of the welding head portion 4 and the tip holder CH grip a curved portion continuous with the linear portion of the swivel stub tube W2A. In this case, by adopting the connecting block 53A having the bent portion 53c of the grip portion 5, the welding apparatus main body 2 and the welding head portion 4 supported by the welding device main body 2 can be fixed horizontally. In other words, in the grip portion 5, the welding apparatus main body 2 and the welding head portion supported by the welding apparatus main body 2 and the welding head portion supported by the welding device main body 2 so that the turning center of the welding torch T and the tip holder CH and the axis of the linear portion of the stub pipe W2A are coaxial with each other. 4 can be fixed to the stub tube W2A.

That is, in the pipe material circumferential welding device 1 according to this embodiment, it is possible to perform circumferential welding of a type of stub pipe W2A that curves at a position close to the welded portion Wd, which was not possible in the past.

Further, in the pipe material circumferential welding device 1 according to this embodiment, a slide mechanism 8 for horizontally moving the head support portion 3 together with the welding head portion 4 in the vertical direction is provided between the welding device main body 2 and the head support portion 3. Therefore, if the head support portion 3 is moved upward together with the welding head portion 4 by this slide mechanism 8, each of the welding torch T and the chip holder CH is provided with a margin space around the welding head portion 4. The degree of freedom in angle adjustment is expanded, and the adjustment work is facilitated.

Further, in the circumferential welding device 1 of the pipe material according to this embodiment, the connecting projection 24a of the main body side connecting block 24 in the welding device main body 2 is inserted into the connecting groove 53a of the connecting block 53 in the grip portion 5, and the inside of the connecting groove 53a. By tightening the fixing screw 54 whose tip protrudes into the stub pipe W2, the welding apparatus main body 2 and the welding head portion 4 supported by the welding apparatus main body 2 are fixed to the stub pipe W2.

That is, since the welding device main body 2 and the welding head portion 4 supported thereof via the head support portion 3 are attached to the grip portion 5 via the attachment / detachment mechanism, the welding device main body via the grip portion 5 is attached. 2 and the welding head portion 4 supported by the head support portion 3 can be easily fixed.

In the pipe material circumferential welding device 1 according to this embodiment, a connecting block 53A having a bent portion 53c, which is a second gripping part, is adopted as a substitute part for the connecting block 53, which is the first gripping part of the gripping portion 5. Therefore, the curved portion continuous with the straight portion of the stub pipe W2A is gripped, but the welding torch of the stub pipe swivels by adopting the connecting block 53A which is the second gripping part, although not shown. A straight portion having a direction different from that of the straight portion may be gripped.

Further, in the circumferential welding device 1 for the pipe material according to this embodiment, when gripping the curved portion continuous with the straight portion of the stub pipe W2A, the grip portion 5 provided with the connecting block 53A having the bent portion 53c is adopted. However, the present invention is not limited to this, and as another configuration, for example, instead of the connecting block 53A, a connecting block 53B having a bendable hinge portion 53b is provided as shown in FIG. The gripped portion 5 may be adopted.

In this case, it is possible to cope with gripping curved portions having various curvatures. In addition, although not shown, when a grip portion provided with a connecting block having a universal joint such as a ball joint is adopted, it is possible to grip a curved portion of a three-dimensionally curved pipe material. ..
By adopting the grip portion 5 provided with the connecting block 53B having such a bendable hinge portion 53b, it is possible to grip a straight portion having a direction different from that of the straight portion in which the welding torch of the stub pipe turns.

Further, in the circumferential welding device 1 of the pipe material according to the above embodiment, the welding device main body 2 and the welding head portion 4 supported by the welding device main body 2 via the head support portion 3 are detachably attached to the grip portion 5. However, the present invention is not limited to this, and as another configuration, for example, as shown in FIG. 8, the connecting block 53B may be integrated with the welding apparatus main body 2 side.

In the pipe material circumferential welding device 1 according to the above embodiment, the connecting block 53 having the connecting block 53 which is the first gripping part of the gripping portion 5 and the connecting block 53A having the bent portion 53c which is the second gripping part are appropriately adopted. Gripping the straight part continuous with the straight part where the welding torch T and tip holder CH of the stub pipe W2 swivels, gripping the curved part continuous with the straight part of the stub pipe W2A, and the welding torch of the stub pipe (not shown) swivels. It is possible to grip a straight portion whose direction is different from that of the straight portion.

It should be noted that the circumferential welding device 1 for the pipe material according to the above embodiment is dedicated to gripping a straight portion continuous with the straight portion where the welding torch T of the stub pipe W2 and the tip holder CH swivel, or is used for the straight portion of the stub pipe W2A. It is also possible to dedicate it to gripping a continuous curved portion, or to grip a straight portion whose direction is different from that of a straight portion where the welding torch of a stub pipe (not shown) turns.

The configuration of the circumferential welding device for the pipe material according to the present disclosure is not limited to the above-described embodiment, and can be variously modified without departing from the spirit of the disclosure. The applied circumferential welding of the pipe material can be applied not only to the circumferential welding of the hollow pipe material such as the stub pipe described above, but also to the circumferential welding of the solid pipe material.
Further, welding such as TIG welding, MAG welding, plasma welding and the like can be adopted for the circumferential welding of the pipe material.

1 Circumferential welding device for pipe material 3 Head support part (torch support part)
5 Grip 8 Slide mechanism 24a Connecting protrusion (detachable mechanism)
41 Disc (welding head)
51, 52 Half-split ring (grip part)
53, 53A, 53B connecting block (grip part)
53a Connecting groove (detachment mechanism)
53b Hinge 53c Folded part 54 Fixing screw (detachment mechanism)
81 Guide 82 Slider C1, C2, C3 Cable CH Tip holder T Welding torch W1 Pipe gathering W2, W2A Stub pipe Wd Welded part

Claims (8)

It is a circumferential welding device that performs circumferential welding of the welded part of the pipe material.
A welding torch that swivels around the pipe material while facing the welded portion of the pipe material,
A torch support portion that supports the welding torch and
A grip portion for fixing the torch support portion to the pipe material is provided.
The grip portion is a circumferential welding device for a pipe material that fixes the torch support portion to the pipe material so that the turning center of the welding torch and the axis of the pipe material are coaxial with each other. The grip portion is a first gripping part that grips a straight portion continuous with a straight portion of the pipe material in which the weld torch swivels, and a curved portion or a weld torch continuous with the straight portion of the pipe material in which the weld torch swivels. The circumferential welding device for a pipe material according to claim 1, further comprising a second gripping part that grips a straight line portion in a direction different from that of the straight line portion that is swiveled. The grip portion grips a straight portion continuous with a straight portion of the pipe material in which the welding torch swivels, and a curved portion continuous with the straight portion of the pipe material in which the welding torch swivels, or the welding torch swivels. The circumferential welding device for a pipe material according to claim 1, which corresponds to any gripping state of gripping a straight portion in a direction different from that of the straight portion. The circumferential welding device for a pipe material according to claim 1, wherein the grip portion grips a straight portion continuous with a straight portion in which the welding torch of the pipe material turns. The circumferential welding device for a pipe material according to claim 1, wherein the grip portion grips a curved portion continuous with a straight line portion where the welding torch of the pipe material turns. The circumferential welding device for a pipe material according to claim 1, wherein the grip portion grips a straight portion in a direction different from the straight portion continuous with the straight portion in which the welding torch of the pipe material turns. The circumferential welding device for a pipe material according to any one of claims 1 to 6, further comprising a slide mechanism for moving the welding torch in the axial direction of the pipe material. The circumferential welding device for a pipe material according to any one of claims 1 to 7, wherein the torch support portion is attached to the grip portion via a detachable mechanism.

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