JPH01237086A - Method for joining dissimilar material - Google Patents

Abstract

PURPOSE:To reduce the cost in joining by winding the foil like insert material or a Ta, Nb, Au, etc., on the control joining face of one part and executing the joining by interposing it by the joining material of the other part. CONSTITUTION:A conical joining face is formed on the base metal 1 to be joined composed of a Ti or Ti alloy, or Zr or Zr alloy and the foil like insert material 5 of a Ta, Nb, Au, etc., is arranged by winding it on the conical face. The base metal 2 to be joined composed of a stainless steel, etc., and base metal 1 are then joined by interposing the insert material 5 on the joining line and a cover material 3 is welded to the base metal 1 side by electron beam welding under vacuum. The integrated base metals 1, 2 are subjected to diffusion joining inside the pressure container of a high temp. isostatic pressing device. The need for the work stage of the foil like insert material 5 itself is eliminated and even a complicated shape of the joining member can be coped with. The joining cost is drastically reduced because of the working cost of the insert material 5 being unnecessary.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for joining dissimilar materials that is applied to chemical plants, nuclear fuel reprocessing plants, etc.

[Conventional technology]

6, 7, and 8 show the production and procedure of a conventional dissimilar material joining joint method.

Generally when joining stainless steel and Ti and Ti alloys, or stainless steel and Zr and Zr alloys.

Solid phase bonding such as diffusion bonding is commonly used.

In FIGS. 6, 7, and 8, 01 is the base material to be joined, which is Ti and Ti alloy, or Zr and Zr alloy. 02 is the base material to be welded, which is stainless steel, 03 is the stainless steel lid material, 04 is the electron beam welding bead, 0
5 is an insert material, and 06 is a joining line.

First, the joining surfaces of the members 01 and 02 to be joined are machined to have a tapered shape, and after cleaning the machined surfaces, when fitting the member 01 into the member 02 to be joined, the members 01 and 02 are machined. A truncated cone-shaped insert material 05 is placed over the member 2 and the member 10 to be joined, and a clamp 9 is fitted between the members 2 and 10 to be joined.

Next, the side of the member to be joined 01 is closed using a stainless steel lid material. This is then electron beam welded in a vacuum container.
The member to be joined 01 is hermetically sealed within the member to be joined 02 by electron beam welding metal 04. This keeps the joint surfaces in a highly clean vacuum. This integrated joint member (
01, 02) are joined in a pressure vessel of a high-temperature isostatic pressure processing device (commonly known as HIP method). As a result, the members 01 and 02 to be joined are diffusion-bonded at the joining surfaces. This joining member was manufactured into dissimilar material joining pipes and dissimilar material joining rods by machining.

[Problem to be solved by the invention]

As mentioned above, the joining strength was increased by inserting this insert material, but the more complex the shape, the more time and cost it took to manufacture an insert mold that matched the shape of the parts to be joined.

[Means to solve the problem]

The present invention aims to solve the above problems by combining stainless steel and Ti.
This is a joining method in which a foil-like insert material is wrapped around the joining surface of a dissimilar metal joint made of a Ti alloy, or a stainless steel, Zr, and a Zr alloy. That is, in a method of manufacturing a dissimilar metal joint pipe and a dissimilar metal joint rod using Zr-Ti and its respective alloys and stainless steel by a high temperature isostatic pressure processing method (commonly known as the HIP method), Ta.

Joining of dissimilar materials characterized by using one or more foil-like insert materials such as Nb, Au, etc., wrapped around one cone-shaped dissimilar material joining surface of the materials to be joined, and sandwiched between the other of the materials to be joined. The present invention provides a method.

[Effect]

Since the method for joining dissimilar materials of the present invention is as described above, an insert material is wrapped around the joining surface, but this insert material does not need to be processed to match the shape of the members to be joined, and the dissimilar material joint to be joined is This is a joining method that can improve the strength of the joint to be equal to or higher than that of the base materials to be joined.

〔Example〕

Hereinafter, nine embodiments of the present invention will be specifically described based on embodiments shown in the drawings. FIG. 1 is a longitudinal cross-sectional view of a method for manufacturing a dissimilar material joining joint according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the wrapped insert material according to this embodiment. FIG. 3 is a longitudinal cross-sectional view of the dissimilar material joining joint according to this embodiment.

FIG. 4 is a longitudinal cross-sectional view of a method for manufacturing a double truncated cone-shaped dissimilar material joining joint according to a second embodiment of the present invention. FIG. 5 is a longitudinal cross-sectional view of a double truncated cone-shaped dissimilar material joining joint according to this embodiment.

The procedure for manufacturing a dissimilar material joining joint will be explained using FIGS. 1, 2, and 3, and only the points that are different from the conventional method will be explained. In Figures 1 to 4 and 5, 1 is the base material to be welded, which is Ti and Ti alloy.

Or Zr and Zr alloy. 2 is a base material to be joined, which is stainless steel; 3, a stainless steel lid; 4, an electron beam welding bead; 5, a foil insert; and 6, a joining line.

FIG. 1 of the first embodiment is a cross-sectional view of the manufacturing process of a dissimilar material joining joint. The difference between this method and the conventional method in FIGS. 1 and 2 is that the insert material inserted between the members 1 and 2 to be joined is attached differently. In the conventional method, an insert material manufactured by performing machining (grinding, cutting, etc.) according to the shape of the parts to be joined was used, but in this embodiment, a foil-shaped insert material 5 is wrapped around the parts to be joined l. method was used. This insert material 5 is.

As in the past, the material is made to be easily compatible with both the members to be joined 1 and the members to be joined 2, and to increase the bonding strength of the diffusion bonding surface 6. Further, since the manufacturing procedure of the second embodiment shown in FIG. 4.5 is the same as that of the first embodiment, the explanation thereof will be omitted.

Note that the type of insert material is not limited to one type, and any number of types may be used at the same time.

Furthermore, instead of wrapping the foil insert material around the surfaces to be joined, it is cut into pieces according to the shape of the surfaces to be joined.

After that, the divided insert material may be applied to the surface to be joined.

〔Effect of the invention〕

As specifically explained above, in the present invention, stainless steel and T
There is no need to process the insert material used for dissimilar metal joining joints of I and Ti alloys, or stainless steel and Zr and Zr alloys to match the shape of the parts to be joined, and since thin foil is used, the complexity of the parts to be joined can be reduced. It can also accommodate various shapes.

In addition, since it is easy to use multiple types of insert materials in layers, there is no need to process the insert materials to match the surfaces to be joined, as in conventional methods, and installation to the parts to be joined is significantly easier. As a result, processing costs have been significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a method for manufacturing a dissimilar material joining joint according to a first embodiment of the present invention, FIG. 2 is a perspective view of a wrapped insert material according to this embodiment, and FIG. A vertical cross-sectional view of a joint made of dissimilar materials. FIG. 4 is a longitudinal sectional view of a method for manufacturing a double truncated cone-shaped dissimilar metal joint according to the second embodiment of the present invention, and FIG. 5 is a longitudinal sectional view of a double truncated cone-shaped dissimilar metal joint 1 according to the present embodiment Longitudinal sectional view, No. 6
FIG. 7 is a perspective view of a conventional tubular insert material, and FIG. 8 is a longitudinal sectional view of a conventional dissimilar material joint. DESCRIPTION OF SYMBOLS 1... Base material to be joined, 2... Base material to be joined, 3... Lid material, 4... Electron beam welding bead, 5... Foil-shaped insert material, 6... Joining line .

Claims (1)

[Claims] In the method of manufacturing dissimilar metal joint pipes and dissimilar metal joint rods using Zr, Ti and their respective alloys and stainless steel by high temperature isostatic pressure/pressure processing method, foil-shaped insert materials such as Ta, Nb, Au, etc. A method for joining dissimilar materials, characterized in that one or more sheets are wrapped around one conical joining surface of dissimilar materials of materials to be joined, and sandwiched between the other of the materials to be joined.