JPS581684A - How to weld the tank bottom plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a method for welding a tank bottom plate.

Generally, a tank bottom plate is assembled by butt welding a number of bottom plate members using a backing metal on the foundation on which the tank is installed.

Conventionally, as shown in Fig. 1, this type of welding method involves a backing metal (C) in the four parts (5) provided on the foundation (-).
), and place the bottom plate member (d) on the corresponding backing metal (C).
After butt-mounting and placing it in contact with the bath, or as shown in Fig. 2, place a backing metal (C) directly on the foundation (a) and place a step-formed bottom plate on the bottom metal (C). Parts (d) and (d) are placed butt-mounted and then welded, but since the backing metal (C) in both is a permanent backing metal, it is not possible to perform an X-ray inspection of the welded part, and the backing metal The gold (C) part had a structure in which welding defects were likely to occur.

In view of these circumstances, the present invention has been made to provide a method for welding a tank bottom plate in which defective parts can be easily detected by performing an X-ray inspection after butt-welding the bottom plate members. The tank bottom plate members to be welded are placed on a foundation provided with grooves so that the abutting portions of the tank bottom plate members to be welded are located on the grooves, and then the abutting portions are sequentially welded from the upper surface side, and at the same time, the The present invention is characterized in that a backing metal moving device arranged so as to be in contact with the lower surface of the abutting portion is moved in accordance with the welding location.

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

As shown in FIGS. 6 and 4, first, a foundation (2) is provided with a groove (1) of a required depth at a predetermined position, and the foundation (2) is
Above, the tank bottom plate member (3) (3) is placed so as to butt against the groove (1). Next, a backing metal moving device (5
) is arranged in the groove (1), and the bottom plate member (3) (3)
A welding device (7) having a welding torch (6) for welding the groove of the butt portion is placed on the bottom plate member (3). A phototube type position synchronization device (8) is provided between the backing metal moving device (5) and the welding device (7) so that both can move in synchronization.
) is provided.

In this state, the synchronizing device (8) is operated to synchronize the backing metal moving device (5) and the welding device (7).

In this way, the backing money (4) of the backing money moving device (5)
to support the butt lower surface of the bottom plate member (3) (3),
At the same time, using the torch (6) of the welding device (7), the bottom plate member (3) is
) Sequentially weld the butt grooves in (3). Note that the light from the tuning device (8) passes through the gap between the butt grooves of the bottom plate member (3) (3).

After welding the bottom plate member (3) (3) as described above, load the backing metal moving device (5) from the groove (1) and remove the welding device (7) from above the bottom plate member (3). except. Thereafter, as shown in FIGS. 5 and 6, a winding Citram type X-ray film moving device (9) is placed in the groove (1), and an X-ray film is placed on the welded part of the bottom plate member (3). The irradiation machine (10) is placed.Then, by operating the ultrasonic position synchronization device installed between the two, the film moving device (9) and the X-ray irradiation machine 00 are moved in synchronism, and the welding area is An X-ray inspection is performed. If the X-ray inspection reveals that the welded portion has a defect, the welded portion is welded again to make it defect-free.

After the X-ray inspection and repair work of the welds if necessary are completed, the groove (1) is filled with a removable filler, such as sand, so that it can be reused for inspection after tank operation. put.

In addition to the phototube method and the ultrasonic method, the position tuning device used in the above embodiments may also be of the limisotosinchi method, the X-ray method, the cable winding method, or the like, as appropriate.

As mentioned above, according to this statement, a foundation with a groove of a required depth is used, the bottom plate members placed on the foundation are butted together by the groove work, and a backing is placed in the groove. Since the butt part is supported by the gold moving device and at the same time welded by the welding device placed on the bottom plate member, it is possible to perform an X-ray inspection after welding using the groove, and therefore This provides excellent effects such as a highly reliable welded structure and the ability to obtain a high-quality tank bottom plate.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing a conventional tank bottom plate welding method, respectively, and FIG. 3 is a front view showing an example of a state in which the butt portions of bottom plate members are welded using the method of the present invention, Fourth
The figure is a side view of Fig. 3, Fig. 5 is a front view showing an example of a state in which an X-ray inspection is performed after welding the bottom plate members, and Fig. 6 is a side view of Fig. 5.
FIG. (1)...Groove, (2)...Foundation, (3)...Bottom plate member, (5)...Backing metal moving device, (7)...Welding device. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd. Figure 5 Figure 6

Claims (1)

[Claims] 1) Arrange the abutting parts of the tank bottom plate members to be welded on the foundation with grooves at predetermined positions so that they are located on the grooves, and then weld the abutting parts sequentially from the upper surface side, at the same time, A method for welding a tank bottom plate, characterized in that a backing metal moving device disposed in the groove so as to be in contact with the lower surface of the abutting portion is moved in accordance with the welding location.