JPH1133748A - Fixing and protecting method of insertion material for joining and joining material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fasten and protect the insertion material by a simple and an inexpensive method, and to stabilize a joining quality by covering the insertion material and a joining face with a substance to be dissipated by gasification before the insertion material is melted. The insertion material is fixed to the joining face and protected. SOLUTION: A joining face 2 of a steel pipe 1 is vertical against a pipe axis and the insertion material 3, a shape of which is the same as the joining face, is installed on the joining face 2. When the insertion material 3 is fastened to the joining face, a substance to be dissipated by gasification such as a resin film 4 is placed over the insertion material. The resin film 4 is adhered and fixed to the material 3 with an adhesive 5 and the like while the inserting material is stretched over the inner and outer faces of the pipe 1 in a way not coming off from the joining face. The insertion material is thus adhesively fixed to the joining face, conforming to the shape of the joining face without a shear, and is protected with the overlaid resin film 4. Thereby, no exfoliation or loss of the insertion material occurred even in case the other substitute is contacted at the time of the joining operation and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing and protecting an insert material on a joint surface when an insert material is interposed in a joint surface of various materials to be joined and fixing the insert material to the joint surface. And protected material to be joined.

[0002]

2. Description of the Related Art As one of the methods of melting and inserting an insert material by interposing an insert material at a joint surface of a material to be joined, an insert material is interposed between a pair of materials to be joined, and the material is pressurized. There is a liquid phase diffusion bonding method in which the element contained in the insert material is diffused into the material to be bonded by heating the material. In this liquid phase diffusion bonding method, since the metal element in the insert material is easily diffused, bonding can be performed by heating for a relatively short time, and it is possible even in the air. Therefore, it is attracting attention as an inexpensive and simple joining method that replaces MIG welding and TIG welding in on-site construction of oil well steel pipes and the like.

In such a liquid phase diffusion bonding, it is necessary to insert an insert material formed in accordance with a shape of a bonding surface without shifting to a bonding surface of a material to be bonded. As a method of intervening without inserting the insert material into the joining surface, Japanese Patent Laid-Open No. 4-75736 discloses that before inserting a pair of joining members to be joined, the insert material is bonded to the joining surface of one of the joining members. It is disclosed to fix in advance by adhesion, spot welding or magnetic adhesion.

[0004] Further, from the viewpoint of simplification of on-site construction work and handling of foils, it is desired to use a material to be joined in which an insert material is previously adhered to a joining surface. Japanese Patent Application Laid-Open No. 6-218 describes a material to be joined to which an insert material is attached in advance.
No. 559 discloses that a plating film is formed as an insert material on a bonding surface of a material to be bonded.

[0005]

However, since the insert material is a thin foil, if it is simply fixed to the joining surface as in the method of Japanese Patent Application Laid-Open No. 4-75736, other objects may come into contact during the joining operation or the like. For example, there is a problem that the insert material is peeled or broken, and the joining quality is deteriorated. In addition, there is a risk that foreign matter is mixed between the joining surface and the insert material, and the joining quality is reduced. Therefore, it is necessary to protect the foil fixed to the bonding surface until the materials to be bonded are pressed against each other and pressurized in order to prevent peeling, breakage, and foreign matter mixing.

On the other hand, the material to be joined disclosed in JP-A-6-218559, which is plated from the viewpoint of simplifying on-site construction and handling of foils, has a problem that the formation of a plated film as an insert material is costly. There is.

The present invention has been made to solve the above problems, and to provide a method for fixing and protecting an insert material at a low cost by a simple method, and to provide a material to be joined in which the insert material is fixed on a joint surface and protected. Aim.

[0008]

Means for Solving the Problems The first invention of the present invention is:
When the insert material is interposed on the joint surface of the material to be joined and the insert material is melted and joined, the insert material and the joint surface are covered with a substance that is gasified and disappears before the insert material is melted, and the insert material is covered. The method for fixing and protecting an insert material, wherein the method is fixed to the joining surface and protected, and the second invention is a method according to the first invention,
A method for fixing and protecting an insert material characterized by using liquid phase diffusion bonding as a bonding method.The third invention is the first invention or the second invention, in which the insert material is gasified before melting. A method for fixing and protecting an insert material, wherein a resin film is used as a substance that disappears.

Further, the fourth invention uses a substance which is gasified and disappears before the insert material is melted when the insert material is melted and joined by interposing the insert material on the joining surface of the material to be joined. A material to be joined that covers the insert material and the joining surface, and secures and protects the insert material to the joining surface. In the fifth invention, in the fourth invention, the material is gasified and disappears before the insert material is melted. A material to be joined, wherein an insert material is fixed to a joining surface and protected, wherein a resin film is used as a material to be joined.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is characterized by a method of fixing and protecting an insert material on a joint surface when an insert material is interposed between joint surfaces of a material to be joined and the insert material is melted and joined. have. The insert material referred to here refers to a brazing material for performing brazing, an amorphous foil for performing liquid phase diffusion bonding, and the like. The material to be joined in the present invention is not particularly limited, and can be applied to materials such as ceramics and metals.
Further, the shape is not specified, and the present invention can be applied to, for example, a pipe material such as a steel pipe and a strip material such as a steel bar.

The present invention will be specifically described below with reference to the drawings. FIG. 1 schematically shows protection of an insert material when a steel pipe is used as a material to be joined. FIG. 2 schematically shows a longitudinal section of FIG.

In FIGS. 1 and 2, a joining surface 2 of a steel pipe 1 is perpendicular to a pipe axis, and an insert material 3 having the same shape as the joining surface 2 is provided on the joining surface 2. When fixing the insert material 3 to the joint surface, the insert material is covered with a substance which is gasified and disappears from the insert material, for example, a resin film 4, and the resin material 4 does not shift from the joint surface to the inner surface and the outer surface of the steel pipe 1. And tightly fixed with an adhesive 5 or the like. Thus, the insert material is fixed in a state of being closely adhered to the joint surface without being shifted according to the shape of the joint surface, and since the insert material is covered and protected by the resin film 4, it comes into contact with other objects during the joining operation and the like. In this case, the insert material does not peel or break. Further, even if the joining surface becomes dirty, the stain can be removed without touching the insert material, so that the insert material does not shift, chip, peel or the like at the time of removing the stain.

As the resin film to be used, a resin film which is gasified before the used insert material is melted and does not leave a residue is selected.
For example, polyethylene or polypropylene whose constituent elements are composed of C and H and which burn and gasify at a low temperature is used. A transparent resin film may be used so that the state of the fixed foil can be checked. The thickness of the resin film 4 may be a thickness that can be completely gasified by heating at the time of bonding. The shape of the resin film 4 may be a sheet shape, a shape formed in advance according to the shape of the end surface of the bonding surface, or a shape that is hardened after application in an irregular shape. Used. Then, a resin film to which a foil is pasted may be used so that the foil can be easily fixed.

The resin film 4 may cover the insert material according to the shape of the joining surface of the material to be joined.
As shown in (c), a part of the insert material or the whole or a part of the material to be joined may be covered. As a method for fixing the resin film, an adhesive tape, a binding band, or the like may be used instead of the adhesive. Before the insert material is fixed with the resin film, an adhesive, an adhesive tape, magnetic adhesion, or the like may be applied to a part or the whole surface so as not to be displaced from the joining surface.

In the method of the present invention, the insert material to be used may be foil, powder, or the like, which is adapted to the shape of the material to be joined and the shape of the joining surface.
In addition to a flat ring shape, if the pipe end face is a convex taper shape, a frustoconical ring shape is used.
Various shapes such as a ring shape are also possible. The insert material may be fixed to one or both of the joining surfaces of the materials to be joined.

[0016]

EXAMPLE An insert material was fixed and protected on a steel pipe by the method of the present invention, and the steel pipes were liquid-phase diffusion bonded to each other using the steel pipe having the insert material fixed and protected. The steel pipe is JIS G 344
STK400, outer diameter is 264.4 mm, inner diameter is 228.8 mm, and wall thickness is 17.8 mm. The joint between both steel pipes 1 was machined so as to be perpendicular to the pipe axis as shown in FIG. Insert material is Fe-9wt% Si-1.5wt% B
An amorphous alloy foil having a thickness of 30 μm was used. This insert material 3 was formed in a ring shape having a size corresponding to the joining surface 2 at the pipe end. In addition, insert material 3
A polyethylene sheet 6 having a thickness of 50 μm was used as a substance to be fixed and protected.

When fixing the insert material 3, first, as shown in FIG.
After applying the adhesive 5 in the circumferential direction at a position of mm, a polyethylene sheet 6 having a size of 900 × 900 mm is applied to the inner surface of the steel pipe 1.
Was inserted and fixed at the position of the applied adhesive. Thereafter, the insert material 3 is placed on the joint surface 2 and the polyethylene sheet 6 fixed to the inner surface of the steel pipe 1 as shown in FIG.
Was folded over the outer surface of the steel pipe 1 to cover the insert material 3, and a polyethylene sheet was stretched in a circumferential direction at a position 50 mm from the pipe end on the outer surface of the steel pipe 1 so as to be tightly fixed to the steel pipe 1 with an adhesive 5. In the case where the insert material was fixed and protected in this manner, the insert material could be adhered without shifting from the joint surface.

Liquid phase diffusion bonding was performed using a steel pipe in which the insert material was fixed and protected. One of the other steel pipes was not provided with an insert material. After butting and pressing the steel pipes, the joint was heated by high-frequency induction heating. The heating rate during heating was about 5 ° C./sec. After reaching 1200 ° C., the temperature was held for 5 minutes, and the power was turned off to cool. After cooling, a tensile test specimen with the joint almost at the center was sampled and subjected to a tensile test.As a result, there was no deterioration in the joining quality due to the influence of the polyethylene sheet, and the joint broke at the base material, and the strength and toughness of the joint were reduced. It was sufficient as a structural member.

[0019]

According to the method of the present invention, the insert material can be fixed to the joining surface of the material to be joined without displacement and can be protected at a low cost by a simple method. When other objects come into contact with each other, there is no peeling or loss of the insert material, and since the insert material can be present over the entire joint surface, the joining quality is stable. Further, at the time of joining, the fixed protective material is gasified by heating and disappears, so that there is no deterioration in the mechanical properties of the joined portion due to the intervention of foreign matter.
In addition, since a material to be joined to which the insert material has been attached in advance can be provided, it is not necessary to handle the foil on site and the work efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a schematic view (perspective view) showing an example of the present invention.

FIG. 2 is a schematic diagram (side sectional view) showing an example of the present invention.

3A is a schematic diagram showing an example of the fixed protection method of the present invention, FIG. 3B is a schematic diagram showing another example of the fixed protection method of the present invention, and FIG. It is a schematic diagram which shows the other example of a method.

FIG. 4 is a schematic view showing an embodiment of the present invention, in which (a)
Shows a case where an insert material is inserted, and (b) shows a case where the insert material is covered and fixed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Steel pipe 2 ... Joining surface 3 ... Insert material 4 ... Resin film 5 ... Adhesive 6 ... Polyethylene sheet

Continuing from the front page (72) Inventor Kunihiro Yukien 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division (72) Inventor Satoru Shida 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Company Technology Development Division

Claims (5)

[Claims] When an insert material is interposed in a joining surface of a material to be joined and the insert material is melted and joined,
A method for fixing and protecting an insert material, comprising covering the insert material and a joint surface with a substance that is gasified and disappears before the insert material is melted, and fixes and protects the insert material on the joint surface. 2. The method for fixing and protecting an insert material according to claim 1, wherein liquid phase diffusion bonding is used as a bonding method. 3. The method for fixing and protecting an insert material according to claim 1, wherein a resin film is used as a substance that is gasified and disappears before the insert material is melted. 4. An insert material is interposed in a joining surface of a material to be joined, and when the insert material is melted and joined, the insert material and the joining surface are covered with a substance which is gasified and disappears before the insert material is melted. A material to be joined, wherein the insert material is fixed to the joining surface. 5. The material to be joined according to claim 4, wherein a resin film is used as a substance which is gasified and disappears before the insert material is melted.