JPH08257746A - Welding equipment and welding method - Google Patents

Abstract

PURPOSE: To precisely set a targeting position of a welding torch along weld line by guiding a welding torch along weld line while a guide roller supports a welding torch and is abutted/rolled on an object to be welded. CONSTITUTION: An object to be welded consisting of first/second cylinders 2, 3 and a heat transfer fin 10 is supported turnable by a turning roller 16. A mounting table 20, which is laid with a guide rail 22 parallel to weld line neighboring with the roller 16, is arranged. A running truck 23 is arranged on the guide rail free to run. A boom 26 of prescribed length is mounted at the side of object to be welded of running truck 23. The boom 26 is guided along the guide rail 22 by a guide roller 27. A welding torch 33 is arranged at the tip part of boom 26. Guide rollers 38, 39 arranged at the side of boom 26 supports the torch 33 and is abutted/rolled on objects 2, 3, 6, to be welded so as to guide the welding torch 33 along weld line. By this method, the weld line having deep depth at narrow part is easily welded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention arranges fin-shaped objects to be welded radially on an inner cylinder and an outer cylinder at a predetermined angle and arranges them in a narrow portion surrounded by the objects to be welded. The present invention relates to a welding facility and a welding method for welding an object to be welded.

[0002]

2. Description of the Related Art Generally, in an existing container (hereinafter referred to as a cask) for transporting spent nuclear fuel, since the radioactive level of spent nuclear fuel is relatively low, a neutron shield is provided between the intermediate cylinder and the outer cylinder. Water is enclosed as a material, which sufficiently shields neutrons and radiates heat.

However, a cask for a spent nuclear fuel having a high radioactivity level has been proposed, and the cask is
A synthetic resin is filled as a shielding material for shielding neutrons between the intermediate cylinder and the outer cylinder, and since the synthetic resin is filled in this way, between the inner cylinder and the outer cylinder, for example, made of copper. It has become necessary to improve the heat transfer performance by pre-welding the heat transfer fins at a narrow interval.

In a cask for such spent nuclear fuel having a high level of radioactivity, as a welding device for welding the heat transfer fins at a narrow interval, a position detector detects a welding line to detect the welding line. It is conceivable that the welding torch is made to follow the signal from the.

[0005]

As described above, in the welding apparatus in which the position detector detects the welding line and the welding torch is made to follow the signal from the detector, the position detector and There are problems that the number of parts attached to it increases, the size of the device increases, and the manufacturing cost of the entire device increases.

Therefore, an object of the present invention is to provide welding equipment and welding method capable of solving the above problems.

[0007]

A means for solving the problems in the present invention is to provide a support member for rotatably supporting a welded product around its axis, and in the welding direction of the support member. Adjacent to each other, an installation stand with a guide rail laid parallel to the welding line is arranged, and a traveling carriage is provided on the guide rail so that the traveling carriage can travel freely. A boom having a length of 1 is attached, a guide roller for guiding the boom along the guide rail is provided at the end of the installation base, and a welding torch is arranged at the tip of the boom to support the welding torch. At the same time, a guide roller is provided on the boom side for abuttingly rolling on the object to be welded and the object to be welded to guide the welding torch along the welding line.

Further, the welding torch and the narrowed portion are aligned by driving the supporting member for supporting the welded article and rotating the welded article around its axis, and the guide rail provided parallel to the welding line. By moving the traveling carriage along with, the boom attached to the traveling carriage is moved in parallel with the welding line, the welding torch provided at the tip of the boom is inserted into the narrowed portion, and the welding torch is supported and provided on the boom. The welded portion is welded by rolling the guide roller in contact with the object to be welded and the object to be welded and causing the welding torch to follow the welding line.

[0009]

In the above means for solving the above problems, the welding torch and the narrowed portion are aligned by driving the support member for supporting the welded product and rotating the welded product around its axis, and the welded torch and the narrowed portion are aligned in parallel with each other. By moving the traveling carriage along the guide rails provided, the boom attached to the traveling carriage is moved parallel to the welding line and the welding torch provided at the tip of the boom is inserted into the narrowed portion to support the welding torch. The guide roller provided on the boom is brought into contact with the welding object and the object to be welded to roll the welding torch along the welding line, and the welding portion in the narrowed portion is welded.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. First, as shown in the cross-sectional view of FIG. 1, a cask 1 according to an embodiment of the present invention includes a first outer cylinder (outer cylinder) 2 and a second inner cylinder (inner cylinder) of the first cylinder 2. (Cylinder) 3, a third cylinder 4 arranged further inside the second cylinder 3, an annular fin 5 attached outside the first cylinder 2, a first cylinder 2 and a second cylinder 3 2, a synthetic resin (also referred to as a resin) 7 filled in the heat transfer space 6 having a narrow space, and as shown in FIG. A heat transfer fin 10 made of copper, a shield (for example, lead is used) 12 filled in a shield space 11 between the second cylinder 3 and the third cylinder 4, a bottom side bottom plate 13 and an upper part And a lid 14 on the side.

In such a cask 1, before the heat transfer space 6 between the first cylinder 2 and the second cylinder 3 is filled with the synthetic resin 7, the heat transfer fins 10 are connected to the first cylinder 2 and Welding equipment 15A for welding the heat transfer fins 10 to the first cylinder 2 side is provided so as to be passed over to the second cylinder 3.

As shown in FIGS. 3 and 4, in the welding equipment 15A, the first tubular body (welding object) 2 in which the second tubular body 3 is fitted is laid down, and around the axis thereof. A pair of left and right turning rollers (an example of a supporting member) 16 for rotatably supporting the turning roller 1 are provided.
Next to 6 is a first cylinder 2, a second cylinder 3 and a heat transfer fin 1.
A long installation base 20 is arranged in the welding line direction 0 of 0, and a guide rail 22 parallel to the welding line is laid on the installation base 20.

A traveling carriage 23 is movably provided on the guide rail 22 via traveling rollers 25. The traveling carriage 23 is arranged on the second cylinder 3 side of the traveling carriage 23 in parallel with the welding line and has a predetermined length. A boom 26 having a size (slightly shorter than the installation table 20) is attached, and a guide roller for supporting the boom 26 in the middle and guiding the boom 26 along the guide rail 22 to the second cylinder 3 side. 27 is the installation base 20
Is attached to the end of the sheet via a mounting member 28.

As shown in FIG. 4, a welding torch 33 is attached to the tip end side of the boom 26 via a support device 30,
The support device 30 is mounted on the boom 2 at the lower end of the boom 26.
6, a first supporting member 31 mounted in parallel with the first supporting member 31, and a second supporting member 34 mounted on the distal end side of the first supporting member 31 via a slide adjusting mechanism 32 and gripping the distal end portion of the welding torch 33. Of the second support member 34, which is provided on the base of the second support member 34 to support the middle of the welding torch 33 and to adjust the horizontal position of the welding torch 33 in the horizontal direction. A vertical adjustment mechanism 36 arranged at the tip end portion for adjusting the vertical position of the welding torch 33, a support leg 37 attached to the second support member 34 via this vertical adjustment mechanism 36, and this support leg A front guide roller 38 rotatably attached to the lower end of 37 and an attachment member 44 to the front end of the boom 26.
And a rear guide roller 39 that is rotatably attached via the.

The slide adjusting mechanism 32 is attached to the front end of the first supporting member 31 to support the horizontal slide body 40, and the slide adjusting mechanism 32 is attached to the horizontal slide body 40 and the rear end of the second support member 34. Support 43 for vertically supporting the vertical slide body 42 attached to the section
It consists of and.

The horizontal adjustment mechanism 35 includes the second support member 3
4, a support base 45 mounted on the base 4, a holding member 47 mounted on the support base 45 via a horizontal slide base 46 and for holding the middle of the welding torch 33, and for moving the horizontal slide base 46 in the horizontal direction. The adjusting screw 48 of FIG.

The vertical adjustment mechanism 36 includes the second support member 3
4, a pair of projecting pieces 50 protruding at the upper and lower portions of the tip, an adjusting screw 51 passed to both projecting pieces 50, and a screwing member 5 attached to the upper part of the support leg 37 and screwed to the adjusting screw 51.
2 and.

The guide rollers 38 and 39 are arranged such that when the welding torch 33 is inserted between the first cylinder 2 and the second cylinder 3, the first cylinder 2 and the second cylinder 3 are inserted. To guide the welding torch 33 along the welding line.

Then, as shown in FIGS. 5 and 7, a welding facility including another guide rail which is common to the installation base 20 and is provided separately from the guide rail 22, a traveling carriage, a welding torch and a supporting device. 15B is provided and the configuration of each is the same as the above, so the description thereof is omitted, but this welding facility 15B is for welding the heat transfer fin 10 to the second tubular body 3 side.

Next, a welding method will be described in which the heat transfer fin 10 is passed between the first cylinder 2 and the second cylinder 3 and welded by using the welding equipment 15A having the above-described structure. First, the heat transfer fin 10 is installed across the first cylinder 2 and the second cylinder 3 at a predetermined angle, and the turning is performed with the first cylinder 2 having the second cylinder 3 fitted therein lying down. It is placed on the roller 16.

Next, by moving the traveling carriage 23 along the guide rail 22, the welding torch 33 is moved to the heat transfer space 6.
And heat transfer fin 10 is welded by moving along the welding line.

At this time, as shown in FIG.
Simply moving the welding torch 33 causes the heat transfer fin 1 to move.
Since it is considered that the welding torch 33 collides with 0 and cannot be inserted into the heat transfer space 6, it is necessary to align the welding torch 33 with the predetermined heat transfer space 6 so as not to collide with the heat transfer fin 10.

In this alignment, first, the turning roller 16 is driven to move the first cylinder 2, the second cylinder 3 and the heat transfer fins 10 around the axis of the first cylinder 2 (second cylinder 3). It is carried out by rotating the installation table 20.
Depending on the height of the heat transfer fin 10 and the inclination angle of the heat transfer fin 10, the welding torch 33 may collide with the heat transfer fin 10 even if the turning roller 16 is driven and aligned. As a matter of course, it is necessary to set the height of the installation table 20 or the height of the guide rail 22 in consideration of the height and the inclination angle of the heat transfer fin 10.

After the turning roller 16 is driven to align the welding torch 33 with the predetermined heat transfer space 6,
The slide adjusting mechanism 32, the horizontal adjusting mechanism 35, and the vertical adjusting mechanism 3 so that the welding torch 33 accurately follows the welding line.
6 is operated to make a fine adjustment so that both guide rollers 38, 39 abut and roll on the first cylinder 2 and the second cylinder 3.

After that, the traveling carriage 23 is again guided to the guide rail 2
2 is made to travel, the welding torch 33 is made to follow along the welding line, and when one heat transfer fin 10 has been welded to the first cylinder 2 side, the traveling carriage 23 is driven again to drive the welding torch 33.
Is removed from the predetermined heat transfer space 6, and then the turning roller 16 is driven again to perform the same work as above with respect to the welding line of the adjacent heat transfer space 6. Weld to body 2 side.

On the other hand, as shown in FIGS. 5 and 7, the work of welding the heat transfer fins 10 to the second cylindrical body 3 side is carried out in parallel in the welding equipment 15B, and the first cylindrical body 2 and the second cylindrical body are The work of welding the heat transfer fins 10 to the first cylinder 2 and the second cylinder 3 in the heat transfer space 6 is completed by rotating the body 3 once,
After that, the heat transfer space 6 is filled with synthetic resin.

As described above, according to the embodiment of the present invention, the guide rail 22 parallel to the welding line is provided on the installation table 20, the traveling carriage 23 provided on the guide rail 22 is caused to travel, and the welding torch 33 is transmitted. Since the heat transfer fin 10 is welded to the first cylinder 2 and the second cylinder 3 by being inserted into the heat space 6,
Even in a narrowed portion (heat transfer space 6) surrounded by the first cylinder 2 and the second cylinder 3 of the cask 1, even a deep welding line can be easily welded, and the guide roller 3
Since the welding torches 33 are welded along the first and second cylinders 2 and 3 by contacting the first and second cylinders 2 and 3 with each other, the welding can be performed without a detector for detecting the weld line. Torch 33
The target position of can be set accurately along the welding line.

[0028]

As is apparent from the above description, according to the present invention, the welding torch and the narrowed portion are aligned by driving the supporting member for supporting the welded product to rotate the welded product around its axis. And move the traveling carriage along the guide rails that are parallel to the welding line, and move the boom attached to the traveling carriage parallel to the welding line so that the welding torch provided at the tip of the boom is narrowed. Since the welding line is inserted and welded, even a deep welding line in a narrowed portion can be easily welded, and the guide roller supporting the welding torch abuts and rolls on the welded object and the object to be welded. By doing so, the welding torch is welded along the welding line, so the target position of the welding torch can be set accurately along the welding line without providing a detector to detect the welding line, and the overall welding equipment configuration Is easy Now, it is possible to suppress cheaper production costs of welding equipment.

[Brief description of drawings]

FIG. 1 is an overall schematic cross-sectional view of a cask showing an embodiment of the present invention.

FIG. 2 is a horizontal sectional view of the cask of the same.

FIG. 3 is an overall schematic front view of the welding facility.

FIG. 4 is also an enlarged detailed view of a welding torch portion.

FIG. 5 is a schematic view showing an alignment state when the welding torch is inserted into the heat transfer space.

FIG. 6 is an enlarged detailed view of the same one welding torch inserted into the heat transfer space.

FIG. 7 is an enlarged detailed view of the other welding torch inserted into the heat transfer space.

[Explanation of symbols]

 2 1st cylinder 3 2nd cylinder 6 Heat transfer space 10 Heat transfer fins 15 Welding equipment 16 Turning roller 20 Installation base 22 Guide rail 23 Traveling carriage 33 Welding torch

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location G21F 5/00 G21F 5/00 K 5/008 F (72) Inventor Masaki Mikata, Osaka City, Osaka Nishi-kujo 5-3-28, Hitachi, Ltd. (72) Inventor Aboshi Takeshi Nishikujo 5--3-28, Nishikojo, Osaka, Osaka, Osaka (72) Inventor Katsuji Fujiwara Osaka, Osaka Hitachi Shipbuilding Co., Ltd. 3-28 Nishikujo 5-chome, Konohana-ku, Yokohama

Claims (2)

[Claims] 1. The object to be welded is composed of an inner cylinder and an outer cylinder, and fin-shaped welded objects are arranged radially between the inner cylinder and the outer cylinder at a predetermined angle so as to be aligned with each other. Welding equipment for welding an object to be welded in a narrowed portion surrounded by a welding object, and a supporting member for supporting the welding object rotatably around its axis is provided. Adjacent to the direction, an installation table is laid with a guide rail parallel to the welding line, a traveling carriage is provided on the guide rail so that the traveling carriage can travel freely, and it is arranged parallel to the welding line on the welded product side of the traveling carriage. And a boom having a predetermined length is attached, a guide roller for guiding the boom along the guide rail is provided at the end of the installation base, and a welding torch is arranged at the tip of the boom. Support the work piece and The welding equipment is characterized in that a guide roller for rolling the contact to guide the welding torch along the welding line is provided on the boom side. 2. A fin-shaped object to be welded, which is arranged radially at a predetermined angle between the objects to be welded consisting of an inner cylinder and an outer cylinder, in a narrowed portion surrounded by the object to be welded. A welding method in which a welding torch is inserted in the welding, and the welding torch and the narrowed portion are aligned by driving a support member that supports the welding object and rotating the welding object around its axis. By moving the traveling carriage along the guide rail provided parallel to the welding line, the boom attached to the traveling carriage is moved parallel to the welding line and the welding torch provided at the tip of the boom is inserted into the narrowed portion. A welding method in which a welding roller is supported by a guide roller provided on a boom and abuttingly rolled on a welding object and an object to be welded so that the welding torch follows the welding line to weld the welded portion. .