JPH07121460B2 - Dissimilar metal joints in containers, etc. - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dissimilar metal joint in a container or the like, and particularly to joining laminated metal plates in parallel by welding,
The present invention relates to a metal joint that is effective when forming a container or the like.

"Prior Art" Generally, when forming a joint made of a dissimilar metal that is difficult to weld, a permanent seal structure cannot be formed by welding, and thus a flange connection structure using bolts or the like is used. Explaining with an example of the pipe shown in FIG. 4, when connecting the pipe 20 made of aluminum and the pipe 21 made of stainless steel, the flange portions 22 are provided at both opposing positions, and the flange portion 22 With a packing material such as packing 23 sandwiched between them, connect them with fasteners 24 such as bolts, and
It is practiced to keep 25 in a sealed state in which it is shielded from the outside.

[Problems to be Solved by the Invention] However, the packing 23 shown in FIG. 4 may gradually lose the sealing property due to aging, etc., and a leakage phenomenon of the internal fluid of the pipeline 25 may occur. If the pipe line 25 is in a vacuum atmosphere, problems such as impairing the degree of vacuum occur.

The present invention solves the above-mentioned problems of the prior art. Even in the case where the joint structure is made of a dissimilar metal material in a container or the like, the laminated metal plates are spliced in parallel and covered. It enables permanent sealing by welding.

"Means for Solving Problems" When there are two structures made of different metals, between one of the first welded surface and the other second welded surface,
A metal layer which is of the same system and is welded to each of these surfaces, and a third layer which is interposed between these metal layers of the same system.
A plurality of laminated metal plates are arranged side by side, and a part of the dissimilar metal layer and the third metal layer are provided at the position of the joint formed between the plurality of laminated metal plates. A processed hole for removing the metal layer is formed, the seam is welded, and a sealing material is filled in the processed hole to form a dissimilar metal joint having a sealed structure.

[Example] An example of a dissimilar metal joint in a container or the like according to the present invention will be described below with reference to FIGS. 1 to 3.

FIGS. 1 to 3 show an example in which a side wall of a slightly smaller cap is mounted and connected to the stepped portion of the container so that the inside is in a communicating state.

In the figure, reference numeral 1 is a container, reference numeral 2 is a cap, reference numeral 3 is a container 1.
The first welded surface which is the horizontal surface of the step portion in the above, the reference numeral 4 is the second welded surface which is the surface of the vertical side wall of the cap 2, and the reference numeral 5 is disposed between both welded surfaces 3 and 4. It is a plurality of laminated metal plates to be installed.

Explaining these in detail, the container 1 is formed of, for example, aluminum in a box shape, and has a structure having an opening and a step portion at the upper side, and the cap 2 is
For example, the container 1 is formed to be slightly smaller than stainless steel, has an opening below, and the lower edge portion of the side wall is mounted on the step portion of the container 1. Therefore, the interiors of the container 1 and the cap 2 are in communication with each other. Further, if necessary, flanges 6 and 7 in an inward state are formed at the boundary between the container 1 and the cap 2, and the packing 9 is held together by fasteners 8 such as bolts and nuts to be integrally connected. It has a possible structure.

On the other hand, the laminated metal plate 5 is, for example, an aluminum layer 10 having a thickness of 8 mm and a titanium layer 11 having a thickness of 1 mm so that the materials of the same system as the constituent metal materials of the container 1 and the cap 2, that is, aluminum and stainless steel are exposed on both sides. , The SUS layer 12 is a composite material formed by stacking the SUS layer 12 to a thickness of 8 mm, and in this case, the aluminum layer (metal layer: first metal layer) 10 is the first welded surface 3 of the container 1. , The SUS layer (metal layer: second metal layer) 12 corresponds to the constituent material of the welded surface 4 of the cap 2, and the titanium layer
11 becomes the third metal layer. Furthermore, at the outer edge of the laminated metal plate 5, a part of the aluminum layer 10 is removed together with the titanium layer 11 and the SUS layer 12 so as to be a material of the same system as the constituent material of the welded surface 3 The exposed exposed portion 13 for welding is formed.

Further, the laminated metal plate 5 is one in which a plurality of laminated metal plates 5 are arranged in parallel and are integrated by welding, and at the positions of mutual joints 14 generated by the parallel condition, a portion serving as an interface of dissimilar metals. Machining holes 15 are formed so as to remove the holes.
As shown in FIGS. 2 and 3, the processed hole 15 is for cutting and removing a part of the titanium layer 11, a part of the aluminum layer 10 and a part of the SUS layer 12 along the titanium layer 11. . Then, SUS that is not in contact with the upper wall of the processed hole 15 or the first welded surface 4
Along the seam 14 of the layer 12, a weld groove 16 is formed, as shown in FIG. In the figure, reference numeral 17 is an inclined surface, reference numeral 18
Indicates a seal material, reference numeral WA indicates an aluminum-based weld metal suitable for welding aluminum layers, reference numeral WS indicates a SUS-based weld metal suitable for welding SUS layers, and the inclined surface 17 is an exposed portion 13 for welding and a processed hole. 15
It is formed gently so as to straddle the
Is a vacuum epoxy adhesive or the like.

Then, between the first welded surface 3 and the exposed welding portion 13, and between the second welded surface 4 and the SUS layer 12 of the laminated metal plate 5 with the appropriate welding material of the same system, respectively, fillet By welding, the container 1, the cap 2, and the laminated metal plate 5 are integrated with each other. The seam 14 of the laminated metal plate 5 is welded and sealed as follows. is there.

In other words, while welding the portion of the weld groove 16,
The opening edge portion of the processed hole 15 intersecting with 14 is welded with the welding material of the same system. By these welding, drilled holes 15
Only the part inside is left hollow. Therefore, machined holes
The sealing material 18 described above is filled in 15 up to the edge portion of the opening and solidified to form a sealing structure.

The dissimilar metal joint thus connected has the exposed portion 13 for welding between the first welded surface 3 of the container 1 and the laminated metal plate 5.
Is welded in a loop shape by aluminum-based weld metal WA so as to provide sealing property, and SUS is formed between the second welded surface 4 which is the surface of the side wall of the cap 2 and the laminated metal plate 5. Welded by SUS series weld metal so as to provide hermeticity, and a seam in a plurality of laminated metal plates 5
The portion 14 has a sealed structure by the welding of the welding groove 16 and the sealing material 18 filled in the processed hole 15.

That is, the welded portion can be freely connected to be in an airtight state by welding between similar metal materials such as aluminum-based weld metal WA or SUS-based weld metal WS, and the size of the laminated metal plate 5 can be increased. A portion requiring a large thickness is not limited by the welding of the seam 14 and the filling of the sealing material 18 into the processed hole 15 so as to limit the size of the entire joint.

Further, although the heat capacity of the welded groove 16 of the laminated metal plate 5 is small, the interface between the dissimilar metals is removed by the processed hole 15 and a hollow portion is formed to hinder heat transfer. Is less likely to be given, and the mechanical strength can be prevented from being impaired.

It should be noted that the following configuration may be adopted instead of the above-described embodiment.

(B) The angle of the joint surface of both containers should be a combination other than a right angle.

(B) Use containers and caps made of other metal components.

(C) The combination material of different metals is optional.

(D) The number of laminated metal plates to be connected is arbitrary, or the number of combinations of dissimilar metals is two layers or four layers or more.

(E) The laminated metal plate should be clad steel such as pressure welding material and weld overlay material.

(F) Omit packings and fasteners.

(G) Applicable when repairing the seal part with packing.

(H) Applicable to containers and piping in nuclear power plants, thermal power plants, chemical plants, etc., or locations where these are used together.

(I) Welding by interposing an auxiliary metal plate for connection between the surfaces to be welded and the laminated metal plate.

(G) Filling the sealing material with pins, balls, etc. loaded into the processed holes.

(L) To reduce the load on the seal material by using the processed hole as a screw hole and by screwing a bolt into the screw hole.

"Effects of the Invention" The dissimilar metal joint in the container or the like according to the present invention has the following effects.

Even when the two structures are made of different kinds of metal materials, it is possible to perform the same system of welding with the laminated metal plates interposed to perform a permanent seal.

Since a plurality of laminated metal plates are used for connection, it is possible to increase the flexibility of the size of the joint.

Since the holes are machined at the joints between the laminated metal plates and are connected by welding and sealing materials, the boundaries of the composite materials are not affected by the welding heat and the structure is not damaged. It is possible to improve the sex.

The laminated metal plate is excellent in practicability such that the combination of different kinds of metal materials can be freely set without being restricted by the composite material, and the application can be expanded in containers and the like.

In a joint having an inward flange, if a leakage phenomenon occurs at the connection point, it can be repaired to ensure the sealing property.

Since a plurality of laminated metal plates are connected and connected to each other, there is little limitation on the size of one sheet, and the flexibility and the practicability are high.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a dissimilar metal joint in a container or the like according to the present invention, FIG. 2 is a front sectional view showing the main part thereof, and FIG. 3 is a view taken along the line III-III in FIG. FIG. 4 and FIG. 4 are front views in which a part is cut away to explain a conventional example of a pipe joint. 1 ... Container, 2 ... Cap, 3 ... First welded surface, 4 ... Second welded surface, 5 ... Laminated metal plate, 6 ... Flange, 7 ... Flange, 8 ... Fastener, 9 ... Packing, 10 ... Aluminum layer (metal layer: first metal layer) 11 ... Titanium layer (third metal layer) 12 ... SUS layer (metal layer: second metal layer) 13 …… Exposed part for welding, 14 …… Seam, 15 …… Processed hole, 16 …… Welding groove, 17 …… Inclined surface, 18 …… Seal material, WA …… Aluminum weld metal, WS …… SUS System welding metal.

Claims (1)

[Claims] 1. A metal layer (between the first welded surface (3) and the second welded surface (4) made of dissimilar metals, which is in the same system and is welded to these surfaces, respectively. 10,12)
And a third metal layer (11) interposed between these metal layers of the same system are arranged in a state in which a plurality of laminated metal plates (5) are arranged, and the plurality of laminated metal plates (5) are arranged. A processed hole (15) for removing a part of the dissimilar metal layer and the third metal layer is formed at the position of the seam (14) formed between the metal plates, the seam is welded, and the processed hole is formed in the processed hole. A dissimilar metal joint in a container or the like, characterized by being filled with a sealing material (18).