JPS6224215B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing multi-layered containers, such as high-pressure stratified cylindrical containers.

For example, the high-pressure stratified cylindrical container 1 shown in FIG.
The mirror 5 is connected to the mirror 5 by a circumferential weld joint 6, and the flange 7 is connected to the other end by a circumferential weld joint 6. Here, the multilayer winding drum 2 is manufactured by fitting a plurality of (three in the figure) tubes 8, 9, and 10 with a fired spring. Therefore, simply shaping the groove and performing circumferential welding for the circumferential welded joint 3 will not allow accurate ultrasonic flaw detection or radiation inspection to confirm the soundness of the circumferential welded joint 3. I can't do it. In other words, the layers of the tubes 8, 9, and 10 that have been fitted with a close fit are not completely integrated, and therefore, when performing ultrasonic flaw detection, the applied ultrasonic waves are reflected between the layers. As a result, some portions of the circumferential welded joint 3 do not reach the deposited metal. In order to solve these problems, welding methods as shown in FIGS. 2 to 4 have recently been considered. That is, as shown in FIG. 2, first each cylinder (each layer) of the multilayer winding drum 2 is
A groove 1 of a predetermined length is machined between 8, 9, and 10.
Apply 1A and 11B. Next, as shown in FIG. 3, the grooves 11A, 11B are welded 12A, 1.
After filling with 2B, the groove portion 13 is shaped into a predetermined shape by machining as shown by the imaginary line. As shown in FIG. 4, the groove portion 13
Circumferential welding 14 is performed between the multilayer winding drums 2 using the following method. According to this welding method, the areas in the multilayer winding drum 2 that require ultrasonic waves to pass through are welded together by welds 12A and 12B that have been applied in advance, so that the input ultrasonic waves are reflected between the layers. never be done. However, according to this welding method, the grooves 11A and 11B are formed, and the groove 11
Filling A and 11B with welds 12A and 12B increases costs, and
A sophisticated technique is required to determine the soundness of A and 12B. In particular, as the thickness and number of layers of the multilayer winding drum 2 increase, the depths of the grooves 11A and 11B become deeper and deeper in proportion to the increase in the thickness and number of layers of the multilayer winding drum 2.
As the number of devices increases, the cost required for this becomes extremely large.

The present invention provides a method for manufacturing a multi-layered container that can solve the above-mentioned problems, and one embodiment thereof will be described below with reference to FIGS. 5 to 8.

First, as shown in FIG. 5, the outer cylinder 2 to be subjected to a loss fit is attached to the outer periphery of both ends of the inner cylinder 20 to be subjected to a loss fit.
1, a metal foil or thin metal plate 22 which is easily adapted to the metal foil or thin metal plate 22 is pasted. Then, the outer cylinder 21 is heated and the inner cylinder 2
0 and then cooled. The term "accommodating metal" here refers to one that has one of the following three properties.

(A) Outer cylinder 21 made of metal such as Ni when it is shrunk
A metal (such as Ni foil for roll cladding) that can be integrated with the opposing metal surfaces of the inner cylinder 20 and outer cylinder 21 under sufficient pressure.

(B) One that reaches near the melting point around the shrinkage fit temperature, has metal crystals below that temperature, and forms a metal structure at each interface when the outer cylinder 21 is shrunk.

(C) It sublimes around the shrink fit temperature, has metal crystals below it, and becomes a metal structure at each interface when the outer cylinder 21 is shrunk.

Therefore, by cooling the outer cylinder 21 fitted onto the inner cylinder 20, the desired blind fit can be achieved as shown in FIG. Layers can be integrated. Then, as shown in FIG. 7, the outer cylinder 23
After the multilayer winding drum 24 is formed by blind fitting, the groove portion 25 is shaped into a predetermined shape as shown by the imaginary line. Next, as shown in FIG.
6.

As described above, according to the present invention, the following effects can be expected.

Γ Grooving and welding work for welding between layers is no longer required, making it possible to reduce construction costs and shorten the construction period.

Γ When performing ultrasonic deep damage or radiation inspection to confirm the soundness of the circumferential weld, false reflections due to diffuse reflection between the layers where metal foil or thin metal plates exist are integrally bonded. Eliminating responses and false images not only makes non-destructive inspection work easier, but also reduces construction costs.
This will lead to a shorter construction period.

Γ Even when the thickness and number of layers of the multilayer winding drum 2 increase as the equipment becomes larger, non-destructive inspection can be easily performed without requiring particularly advanced inspection techniques. The soundness of the circumferential weld can be confirmed.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an example of a multi-layered container, Figs. 2 to 4 are sectional views of essential parts showing an example of a welding method, and Figs. 5 to 8 are one embodiment of the present invention. An example is shown in FIG. 5, which is a longitudinal sectional view before shrink fitting, FIG. 6, which is a longitudinal sectional view after shrink fitting, and FIGS. 7 and 8, which are sectional views of main parts showing the welded state. 20...Inner tube, 21...Outer tube, 22...Metal foil or metal thin plate, 23...Outer tube, 24...Multilayer winding drum, 25...Grove portion, 26...Circumferential welding.

Claims (1)

[Claims] 1. Glue metal foil or thin metal plates that are easily compatible with the outer cylinder to which the heat fit is to be applied to the outer periphery of both ends of the inner cylinder to which the heat fit is to be performed, and then heat the outer cylinder to fit it onto the inner cylinder. A method for manufacturing a multi-layered container, which comprises cooling to create a multi-layered container, and welding both ends of the plurality of multi-layered containers to each other to connect them.