JP2535836C - - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dissimilar metal joint in a container or the like, and in particular, a metal joint effective when a dissimilar metal material is connected by welding to form a container or the like. It is about. "Prior art" Generally, when a joint made of a dissimilar metal that is difficult to weld is formed, a permanent seal structure cannot be obtained by welding, and thus a flange connection structure using bolts or the like is used. Explaining the example of the pipe shown in FIG.
When connecting to the pipe 21 made of stainless steel, flanges 22 are provided at both opposing portions, and a bolt or the like is inserted in a state where a sealing material such as a packing 23 is sandwiched between the flanges 22. Are connected to each other by a fastener 24 so that the pipe 25 is sealed off from the outside. "Problems to be Solved by the Invention" However, in the packing 23 shown in FIG. 3, the sealing property is gradually impaired due to aging and the like, and there is a possibility that the leakage of the internal fluid in the conduit 25 may occur. When the pipe 25 is in a vacuum atmosphere, problems such as impairing the degree of vacuum occur. The present invention solves such a problem of the prior art, and enables permanent sealing by welding even in a case where a joint structure is made of a dissimilar metal material in a container or the like. It is. "Means for Solving the Problems" A first welded surface of a first structure and a metal different from the first structure are used.
The first structure by welding the second surface to be welded of the second structure
A joint for sealing a joint between a body and a second structure, wherein the first surface to be welded is a flat surface.
The first structure is arranged on the outer peripheral portion of the second structure at a right angle to the first surface to be welded.
2 to be welded, and the same welded aluminum-based metal
A first metal layer made of the same type of stainless steel metal as the second welded surface
A second metal layer, and a titanium-based metal interposed between the first metal layer and the second metal layer.
A laminated metal plate formed by laminating a third metal layer made of
And a first metal layer, a third metal layer, and a
An inclined surface is formed so as to straddle the second metal layer, and at the outer edge of the first metal layer,
Forming an exposed portion for welding thinner than the first metal layer continuously with the inclined surface;
In the inner edge portion of the above, an exposed portion for welding thinner than the second metal layer is formed continuously to the inclined surface.
The first metal layer is welded between the exposed portion of the outer green portion for welding of the first metal layer and the first surface to be welded with a welding material made of an aluminum-based metal, and the inner edge portion of the second metal layer is formed.
Between the exposed portion for welding and the second surface to be welded with a welding material made of stainless steel.
A technique of completing a dissimilar metal joint by welding and sealing is adopted. Embodiment An embodiment 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 and 2. FIG. 1 and FIG. 2 show an example in which a side wall of a slightly smaller second container is mounted and connected to a step portion of a larger first container so that the inside is in a communicating state. In the figure, reference numeral 1 denotes a first container (first structure), reference numeral 2 denotes a second container (second structure), and reference numeral 3 denotes a horizontal surface of a step portion in the first container 1. 1, the surface to be welded,
Reference numeral 4 denotes a second welded surface which is a surface of a vertical side wall of the second container 2, and reference numeral 5
Is a loop-shaped (in the example of FIG. 2, a square frame-like continuous rectangular frame) laminated metal plate disposed between the welded surfaces 3 and 4. Describing these details, the first container 1 is formed in a box shape by, for example, aluminum, and has a structure having an opening and a stepped portion above,
The second container 2 is formed to be slightly smaller by, for example, stainless steel,
The lower edge portion of the side wall having an opening below is mounted on the step portion of the first container 1. Therefore, these containers 1 and 2 are internally connected to each other, and if necessary, are formed with inwardly directed flanges 6 and 7 at the boundary portions, so that bolts and
The structure is such that the packing 9 can be integrally connected with the packing 9 sandwiched by fasteners 8 such as nuts. The laminated metal plate 5 is made of the same material as the constituent metal material of the containers 1 and 2, that is, the aluminum layer 10 is 8 mm and the titanium layer 11 is 1 mm so that aluminum and stainless steel are exposed on both sides. , The SUS layer 12 is a composite material formed by laminating the layers to a thickness of 8 mm and exploding. In this case, the aluminum layer (metal layer: first metal layer) 10 is the first welded surface 3 of the container 1. , 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. Further, the outer and inner edges of the laminated metal plate 5 are made of an aluminum layer together with the titanium layer 11 and the SUS layer 12 so as to be made of the same material as the constituent material of the surfaces 3 and 4 to be welded. A part of the titanium layer 12 is removed at the inner edge portion of the titanium layer 12 along with the aluminum layer 10 and the titanium layer 11 at the inner edge part by removing a part of the part 10 to form an upwardly stepped welding exposed part 13. Thus, a downward stepped exposed portion for welding 14 is formed, and these exposed portions for welding 13 and 14 have gently inclined surfaces 15 and 15. Are combined as shown in FIG. 1, a hollow portion 16 is formed at the exposed portion 14 for welding. Then, between the first welded surface 3 and the exposed portion 13 for welding, and between the second welded surface 4 and the exposed portion 14 for welding, fillet welding is appropriately performed with a welding material, and FIG. As shown, the joint is completed by two loop-shaped welding lines 17 and 18 spaced inward and outward. With such a welding method, the dissimilar metal joints in the connected containers and the like are formed such that the first welded surface 3 which is the surface of the step portion in the first container 1 is laminated at two welding lines 17 and 18. Between the exposed portion 13 for welding of the metal plate 5, welding is performed with an aluminum-based welding material so as to impart sealing properties, and the second welded surface 4, which is the surface of the side wall of the second container 2, Between the exposed portion for welding 14 of the laminated metal plate 5, welding is performed by using a SUS-based welding material so as to impart a sealing property, thereby forming a sealed structure. In other words, the two containers 1 and 2 can be freely connected to each other by a welded portion between metal materials of the same system to make an airtight state. In addition, since the welding heat of the inner and outer edges of the laminated metal plate 5 is transmitted to the laminated metal having a larger heat capacity through the exposed portions 13 and 14 for welding, a large thermal influence is exerted on the interface between the dissimilar metals. The effect can be reduced. It should be noted that the following configuration can be adopted instead of the above embodiment. (B) The angle of the joint surface of both containers should be a combination other than a right angle. (B) The container is made of another metal structure. (C) Combination materials of different metals are optional. (D) The number of combinations of different metals should be two or four or more. (E) The laminated metal plate is made of clad steel such as a pressure welding material or a weld overlay material. (F) Omit packings and fasteners. (G) Applicable when the seal is repaired by packing. (H) Containers, piping, etc. in nuclear power plants, thermal power plants, chemical plants, etc.
Alternatively, apply to the combination of these. (I) Welding with an auxiliary metal plate for connection between both welded surfaces and the laminated metal plate. [Effect of the Invention] The dissimilar metal joint in the container and the like according to the present invention has the following effects. Even if the two structures are made of different metal materials, such as an aluminum-based metal material and a stainless-based metal material, the same type of welding is performed with a laminated metal plate interposed.
A permanent seal can be provided. Due to the loop-shaped welding lines at the inner and outer edges of the laminated metal plate, reliable sealing can be performed. Since the exposed portion for welding is formed on the laminated metal plate and the welded surface is welded, the boundary of the composite material is affected by the welding heat and the structure is not damaged, The reliability of the joint can be improved. Laminated metal sheets are not subject to the limitations of composite materials, and have excellent practicality, such as increased flexibility in the combination of aluminum-based metal materials and stainless steel-based metal materials, and can be used to expand applications in containers and the like. is there. If a leakage phenomenon occurs at the connection point of the inward flange, it can be applied to an application to repair the phenomenon and secure the sealing property.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view of a main part showing an embodiment of a dissimilar metal joint in a container or the like according to the present invention, and FIG. 2 shows a welding line when two containers are connected. FIG. 3 is a plan view and FIG. 3 is a partially cutaway front view illustrating a conventional example of a pipe joint. 1 ... 1st container (1st structure), 2 ... 2nd container (2nd structure), 3 ... 1st welded surface, 4 ... 2nd 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 (first metal layer) 3 metal layer) 12 SUS layer (metal layer: second metal layer) 13 exposed part for welding, 14 exposed part for welding, 15 inclined surface, 16 hollow part, 17 part ... Loop welding line 18 ... Loop welding line

Claims (1)

Claims: 1. A first welded surface (3) of a first structure (1), and said first structure.
The second member of the second structure (2) composed of a dissimilar metal with respect to the body (1)
A first structure (1) and a second structure (2) by welding a welding surface (4).
And a joint for sealing a joint portion between the first surface and the first surface to be welded.
The outer surface of the second structure (2) is perpendicular to the first welded surface (3).
A second surface to be welded (4) is provided, and the same system as the first surface to be welded (3).
With respect to the first metal layer (10) made of an aluminum-based metal and the second welded surface (4)
A second metal layer (12) made of the same type of stainless steel metal and a first metal layer (1
0) and a third metal layer made of a titanium-based metal interposed between the second metal layer (12)
A laminated metal plate (5) obtained by laminating (11) and (11) around the second welded surface (4).
And a first metal layer (10) and a third metal layer (3) on both inside and outside of the laminated metal plate (5).
The inclined surface (15) straddling the metal layer (11) and the second metal layer (12)
Formed on the outer edge of the first metal layer (10), continuously with the inclined surface (15).
An exposed portion for welding (13) thinner than the first metal layer (10) is formed, and the second metal layer (
At the inner edge in 12), the second metal layer (12) continues from the inclined surface (15).
Also, a thin exposed portion (14) for welding is formed, and an outer portion of the first metal layer (10) is formed.
The space between the welding exposed portion (13) at the edge and the first surface to be welded (3) is made of an aluminum-based metal.
Welding for the inner edge of the second metal layer (12)
Between the portion (14) and the second surface to be welded (4), a welding material made of stainless steel
A dissimilar metal joint in a container or the like, characterized in that the joint is welded and sealed.