JP2005205449A - Clad material manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clad material manufacturing method in which the manufacturing environment is not limited, no impurities or oxygen are present in a boundary face between a base metal and a dissimilar metal, intermetallic compound such as alloy is not generated on a joining surface of the dissimilar metal, the base metal is not deformed, and dissimilar metal can be joined to a required portion of the base metal in a limited manner. <P>SOLUTION: In the clad material manufacturing method, a metal dissimilar from a base metal 2 (a dissimilar metal) plate 3 is arranged on a surface of the base metal, a tool 1 having projection 12 shorter than the thickness of the dissimilar metal plate 3 is inserted from the dissimilar metal plate 3 side while rotating the tool, and the base metal and the dissimilar metal are mutually diffused and joined to each other on the boundary thereby by rotating and moving the tool 1 and performing friction stir and joining. The tool 1 is inserted so that a tip 121 thereof is in a vicinity of the boundary between the base metal 2 and the dissimilar metal plate 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a clad material having different properties by joining metals having different properties.

  In recent years, many members requiring two or more different properties have been used. Examples of members requiring two or more different properties include pressure vessels and piping. The pressure vessel and the pipe are required to have high corrosion resistance at a portion that contacts high temperature water or a liquid with high acidity, and the outside is required to have a strength capable of withstanding a load.

  A clad material is widely adopted as a metal material having such a plurality of properties. The clad material is a material obtained by joining two or more different materials, and various methods such as a method of rolling in vacuum and an explosion method are known as methods for producing the clad material.

  In the vacuum rolling method, a metal different from the metal base material is superposed on the metal base material, and both are rolled by either cold rolling or hot rolling in vacuum. In the explosive deposition method, a metal different from the metal base material is superimposed on the metal base material to explode the explosive, and the bonding surface is diffused and joined by the explosive force of the explosive.

In addition, materials having different properties can be created by a method of forming a metal film different from the base material on the metal base material by overlaying, spraying, plating, or the like by arc melting.
JP 2001-47261 A

  When manufacturing a clad material by the rolling method in the vacuum, it is necessary to keep the mating surfaces of different metals clean by polishing or the like. In addition, in order to prevent impurities such as oxygen and nitrogen from intervening at the interface between different metals, the work is performed in a vacuum, but it is very difficult to make a large space into a vacuum, and it is difficult to manufacture. Moreover, when performing hot rolling, a metal material may melt | dissolve with a heat | fever and an intermetallic compound may be produced | generated.

  In addition, when manufacturing the clad material by the above-mentioned explosive deposition method, the metal is crimped by exploding the explosive, so facilities that can withstand the blast are necessary, and sufficient safety considerations are necessary. .

  And when manufacturing a clad material by the rolling method and the explosive deposition method, impurities and oxygen are likely to intervene on the boundary surface of dissimilar metals, and when the clad material is manufactured in a state where impurities are present, The strength of the joint surface cannot be obtained sufficiently. In addition, when the clad material is manufactured in a state where oxygen is present, a metal oxide of either a metal base material or a dissimilar metal is generated, and the metal oxide becomes the impurity, so that sufficient strength of the joint surface cannot be obtained. . In each of the above methods, it is difficult to form a clad material only on a portion that slides with another member of an arbitrary member or a portion that the other member collides with.

  Furthermore, when a metal film different from the metal base material is formed on the surface of the base material by overlaying, spraying, plating, or the like by the arc melting, the film thickness of the metal film is very thin. In the case of depositing and spraying by arc melting, the film thickness can be increased. When the film thickness is increased, the metal melted by arc melting (metal to be melted) is at a high temperature when adhering to the base material, and the base material is heated to produce intermetallic compounds such as alloys. Or deform. Further, the combination of the base material and the non-molten metal is limited such as a metal that is easily melted by arc as the non-molten metal, and the base material that is difficult to melt even if the melted metal adheres.

  In view of the above problems, the present invention is a method of manufacturing a clad material for joining a metal having a property different from that of the metal base material to form a clad material, and the production environment is limited. Therefore, it is an object of the present invention to provide a method for manufacturing a clad material that can easily and easily firmly bond different metals.

  The present invention is also a method for producing a clad material for joining a metal base material with a metal having a property different from that of the metal base material to form a clad material, the interface between the metal base material and the dissimilar metal It is an object of the present invention to provide a method for manufacturing a clad material that can be firmly joined with dissimilar metals as much as possible without impurities and oxygen being interposed therebetween.

  Furthermore, the present invention is a method of manufacturing a clad material for joining a metal base material with a metal having a property different from that of the metal base material to form a clad material, and is limited to a necessary portion of the metal base material. An object of the present invention is to provide a method for producing a clad material capable of bonding a dissimilar metal.

  The present invention also provides a method for producing a clad material for joining a metal base material with a metal having a property different from that of the metal base material to form a clad material. It is an object of the present invention to provide a method for producing a clad material capable of joining dissimilar metals without generating a compound or deforming a metal base material.

  In order to achieve the above object, the present invention provides a dissimilar metal plate in a state in which a metal (dissimilar metal) plate different from the metal base material is arranged on the surface of the metal base material and the dissimilar metal is fixed to the metal base material. Inserting from the dissimilar metal plate side while rotating a tool having protrusions shorter than the thickness of the metal, moving the tool while rotating, and friction stir to diffuse the metal base material and the dissimilar metal to each other at the boundary A method for manufacturing a clad material is provided, wherein the tool is inserted so that a tip of the tool is inserted in the vicinity of a boundary between the metal base material and the dissimilar metal plate.

  According to this configuration, the dissimilar metal can be bonded to the surface of the metal base material without limiting the manufacturing environment. Since the manufacturing environment is not limited, it is also possible to join a dissimilar metal to the surface of an existing metal structure to obtain a clad material.

  Furthermore, according to this configuration, the dissimilar metal plate is joined to the metal base material by moving the rotary tool while rotating, so the metal base partly is adjusted by adjusting the cross-sectional area and the moving length of the rotary tool. A clad material for joining a dissimilar metal plate to a material can be manufactured.

  Furthermore, according to the configuration, since both the metal base material and the dissimilar metal are joined without heating to a temperature equal to or higher than the melting point, an intermetallic compound is generated at the joint between the metal base material and the dissimilar metal, or an alloy component contained in each metal It is possible to manufacture a clad material in which the metal base material and the dissimilar metal are firmly bonded.

  In the above configuration, the tip of the tool may not reach the metal base material.

  According to this configuration, since the tip of the rotary tool does not agitate the metal base material, when the metal base material is made of a metal that is easy to react, the metal base material reacts excessively to dissimilar metals and intermetallic compounds. Generation can be prevented.

  The said structure WHEREIN: The powder containing at least one of this metal base material or the said dissimilar metal may be arrange | positioned on the surface of the said metal base material, and the said dissimilar metal may be arrange | positioned on this powder.

  According to this configuration, the plastic flow of the dissimilar metal due to frictional stirring is likely to occur, and the dissimilar metal is easily diffused into the metal base material, and the metal base material and the dissimilar metal are firmly joined.

  The said structure WHEREIN: The surface of the said metal base material may be formed in the unevenness | corrugation.

  According to this configuration, since the surface of the metal base material is formed with unevenness, the surface of the metal base material is likely to cause plastic flow, and since the metal powder is disposed on the unevenness, the stirrability is also increased. Accordingly, the metal base material and the dissimilar metal can be firmly joined easily and easily.

  In the above configuration, a plurality of the dissimilar metal plates may be provided, the plurality of dissimilar metal plates may be stacked, and a powder having a predetermined property may be disposed between the dissimilar metal plates.

  According to this configuration, it is possible to produce a clad material having properties other than the properties of the metal base material and the dissimilar metal. At this time, since each metal is not heated to a temperature higher than the melting point, it is possible to prevent the formation of intermetallic compounds such as alloys and precipitation of alloy components. Can be manufactured.

  The said structure WHEREIN: The said dissimilar metal plate is good also as what shape | molded the powder of dissimilar metal in plate shape.

  According to this configuration, the dissimilar metal plate is formed by molding metal powder, and is easier to transport than using the powder as it is. Further, since the metal powders are connected by a weak bond, plastic flow occurs with a small energy, so that a clad material can be manufactured with a small energy.

  The said structure WHEREIN: It is good also as what shape | molded the metal powder in the shape match | combined with the shape of the arrangement place.

  An example of a method for molding the powder into a plate shape and a predetermined shape is CIP (Cold Isostatic Pressing). In addition to CIP, a method that can be hardened without changing the properties of the metal can be widely adopted.

  In order to achieve the above object, according to the present invention, a metal (different metal) different from a metal base material is placed on a surface of a metal base material, and the dissimilar metal slurry is fixed to the metal base material. In the state, the metal base material and the foreign metal slurry are inserted from the foreign metal slurry side while rotating a tool having a projection shorter than the thickness of the foreign metal slurry, moved while rotating the tool, and frictionally stirred. And the tool is inserted so that the tip is in the vicinity of the boundary between the metal base material and the dissimilar metal slurry.

  According to this configuration, since the clad material is manufactured by disposing the slurry-like dissimilar metal on the metal base material, the dissimilar metal is easily placed even if the surface shape of the metal base material is complicated. It is possible to manufacture a clad material using as many metal members as the metal base material.

  In the above configuration, the tip of the tool may not reach the metal base material.

  In each of the above configurations, the clad material may be manufactured in a deoxygenated atmosphere.

  By doing in this way, it can restrict | limit more strictly that oxygen interposes between the said metal base material and the said dissimilar metal. Thereby, it is possible to manufacture a clad material in which the metal base material and the dissimilar metal are firmly joined.

  In the above configuration, the deoxygenated atmosphere can be exemplified by vacuum, in a liquid not containing dissolved oxygen, in a reducing solution, and the like.

  According to the present invention, a method for producing a clad material for joining a metal base material with a metal having characteristics different from that of the metal base material to form a clad material, without limitation on the production environment, It is possible to provide a method for manufacturing a clad material capable of easily and strongly joining different metals.

  Further, according to the present invention, there is provided a method for producing a clad material for joining a metal base material with a metal having a characteristic different from that of the metal base material to form a clad material, the interface between the metal base material and the dissimilar metal Thus, it is possible to provide a method for manufacturing a clad material that can be bonded to different metals more firmly without impurities and oxygen.

  Furthermore, according to the present invention, there is provided a method for manufacturing a clad material for joining a metal base material with a metal having a characteristic different from that of the metal base material, and the method is limited to a necessary portion of the metal base material. The manufacturing method of the clad material which can join a dissimilar metal to can be provided.

  According to the present invention, there is also provided a method of manufacturing a clad material for joining a metal base material with a metal having a characteristic different from that of the metal base material to form a clad material. It is possible to provide a method for producing a clad material capable of joining different metals without generating a compound or deforming a metal base material.

  The best mode for carrying out the present invention will be described with reference to the drawings. The schematic of the manufacturing method of the clad material concerning this invention is shown to FIG. 1 (A)-(D).

  As shown in FIGS. 1A and 1B, the manufacturing method of the clad material C1 according to the present invention is such that the tip of a cylindrical main body 11 has a smaller diameter than the main body 11 and an axial length longer than the thickness of a dissimilar metal plate 3 described later. The metal base material 2 and the dissimilar metal are joined using the rotary tool 1 having the joining pins 12 formed short.

  As shown in FIG. 1A, a metal (different metal) plate 3 having a property different from that of the metal base material 2 is disposed on the surface of the metal base material 2. Then, as shown in FIG. 1B, the rotary tool 1 is rotated in a state where the dissimilar metal plate 3 is constrained on the metal base material 2, and the joining pins 12 are brought into contact with the dissimilar metal plate 3. When the contact portion of the joining pin 12 of the dissimilar metal plate 3 is softened by frictional heat caused by the rotation of the joining pin 12, the joining pin 12 is pushed into the dissimilar metal 3. At this time, the shoulder portion 13 of the main body portion 11 of the rotary tool 1 is pushed into the dissimilar metal plate 3.

  Thereafter, the rotary tool 1 is translated in a predetermined direction (here, the X-axis direction in the figure) while rotating the rotary tool 1 as shown in FIG. At this time, the rotary tool 1 is moved so that the joining pin 12 always maintains an equal depth from the surface of the dissimilar metal plate 3. By moving the rotary tool 1 while rotating, the metal constituting the dissimilar metal plate 3 can be agitated (friction agitation) using frictional heat and plastic flow, and the dissimilar metal plate 3 in the metal base material 2. It joins by diffusing the metal which constitutes.

Then, after the rotary tool 1 moves by a predetermined length, the rotary tool 1 moves in the direction (Y-axis direction in the figure) orthogonal to the direction in which it has moved (Y-axis direction in the figure) by the approximate diameter of the rotary tool 1 and then the X-axis direction. Move to the other side. By repeating this, the clad material C1 for joining the dissimilar metal plate 3 to the metal base material 2 can be manufactured.

  The clad material C1 produced in this way has the properties of the metal base material 2, and the surface to which the metal constituting the dissimilar metal plate is joined has the property of dissimilar metal, and the metal material has two different properties. It can be. For example, when the metal base material 2 is a metal having a high strength and the metal constituting the dissimilar metal plate 3 is a metal having a high corrosion resistance, the clad material obtained by joining these two metal materials has a high strength. The surface to which the dissimilar metal plate 3 is bonded can be a metal material having high corrosion resistance.

  Moreover, the metal base material 2 and the dissimilar metal plate 3 are joined by moving the rotary tool 1 while rotating, and the joint between the metal base material 2 and the dissimilar metal plate 3 corrodes a metal such as oxygen. Since bonding is performed in a state where no substance is present, stronger bonding is possible.

  Furthermore, even if an oxide film is formed on the surfaces of the metal base material 2 and the dissimilar metal plate 3, the new surfaces of the metal base material 2 and the dissimilar metal plate 3 are brought into contact with each other by friction stirring, Diffusion is performed well. Since no substance other than the metal base material and the dissimilar metal plate is present on the boundary surface, the interface can be firmly joined.

  Since the metal base material 2 and the dissimilar metal plate 3 are moved while rotating the rotary tool 1 to join the dissimilar metal plate 3 and the metal base material 2 by friction stirring, the atmosphere of the construction environment is brought into a special state such as a vacuum. There is no need to keep it, and when a dissimilar metal plate is joined to the surface using a metal member that is already installed as a metal base material, it is possible to perform construction at the installation location without removing the metal member.

  FIG. 2 shows a cross-sectional view of the rotating tool inserted. When manufacturing the clad material C1, the rotary tool 1 is inserted from the surface of the dissimilar metal plate 3 arranged on the surface of the metal base material 2. At this time, as shown in FIG. 2 (B), the tip 121 of the joining pin 12 reaches a position just before the boundary B between the metal base material 2 and the dissimilar metal plate 3 as shown in FIG. 2 (A). The thing which has reached the inside of the metal base material 2 can be illustrated.

  When the clad material C <b> 1 is manufactured using a metal that easily reacts as the dissimilar metal 2, the tip 121 of the joining pin 12 as shown in FIG. 2A is inserted so as not to reach the metal base material 2. As the rotary tool 1 rotates, plastic flow occurs around the joining pin 12, but plastic flow also occurs near the tip 121 of the joining pin 12. By reaching the surface layer of the base material 2 and also activating the surface layer of the metal base material 2, the metals constituting the dissimilar metal plate 3 can be easily joined. As a result, the metal base material 2 is not agitated, and generation of intermetallic compounds due to excessive reaction between the metal base material 2 and the dissimilar metal plate 3 can be suppressed, and the strength of the interface can be increased.

  Further, when a clad material is manufactured using a metal that does not easily react as the dissimilar metal 2, the tip 121 of the joining pin 12 as shown in FIG. 2B is inserted so as to reach the metal base material 2. When such a metal which does not easily react is used, the plastic flow of the metal constituting the dissimilar metal plate 3 occurs only in a portion very close to the joining pin 12, and the joining pin 12 does not reach the metal base material 2. In some cases, the metal constituting the dissimilar metal plate 3 is not sufficiently joined inside the metal base material 2. Therefore, stirring is performed with the tip 121 of the joining pin 12 slightly biting into the metal base material 2 so that the dissimilar metal is sufficiently joined to the metal base material 2.

  FIG. 3 shows a schematic cross-sectional view of the clad material when the method for producing the clad material according to the present invention is used. In the manufacturing method of the clad material C2 shown in FIG. 3, the dissimilar metal plate 3 is disposed on the metal base material 2, but the dissimilar metal plate 3 is configured between the metal base material 2 and the dissimilar metal plate 3. A powder layer 4 made of metal powder is disposed.

  As shown in FIG. 3, the rotary tool 1 is placed inside the dissimilar metal plate 3 by disposing a powder layer 4 made of metal powder constituting the dissimilar metal plate 3 between the metal base material 2 and the dissimilar metal plate 3. When rotated, when the metal constituting the dissimilar metal plate 3 plastically flows, the powder layer 4 also flows in the same manner, and the powder of the powder layer 4 is mixed with the dissimilar metal plate 3 so that the metal base material 2 and the dissimilar material are mixed. The metal plate 3 is joined.

Further, by disposing the powder layer 4 of the dissimilar metal between the metal base material 2 and the dissimilar metal plate 3, even if the thickness of the dissimilar metal plate 3 is changed or the amount of pushing of the tool is changed. The joining pin 12 of the rotary tool 1 does not agitate the metal base material 2, and it is possible to prevent generation of intermetallic compounds such as alloys. In addition, the powder layer 4 has higher agitation than the dissimilar metal plate 3 and can easily produce a clad material.

  In the above embodiment, the metal layer constituting the dissimilar metal plate 3 is exemplified as the powder layer. However, the present invention is not limited thereto, and the metal powder constituting the metal base material 2 may be used. The metal powder constituting the material 2 and the metal powder constituting the dissimilar metal plate 3 may be mixed.

  FIG. 4 shows a schematic cross-sectional view of the clad material when the clad material manufacturing method according to the present invention is used. In the manufacturing method of the clad material C3 shown in FIG. 4, the surface 20 of the metal base material 2 is formed in an uneven surface, the metal powder layer 4 constituting the dissimilar metal plate 3 is arranged on the uneven surface 21, and the powder A dissimilar metal plate 3 is disposed on the layer 4.

  The joining pin 12 of the rotary tool 1 is pushed in from the dissimilar metal plate 3 side and stopped before reaching the boundary B between the metal base material 2 and the dissimilar metal plate 3, and rotates the rotary tool 1 as shown in FIG. Move while moving. In the dissimilar metal plate 3, when the metal plastically flows, the metal of the powder layer 4 also plastically flows. The powder layer 4 plastically flows on the surface of the metal base material 2. At this time, since the surface of the metal base material 2 has the irregularities 21, it is easy to plastically flow, so that the metal constituting the dissimilar metal plate 2 and the metal constituting the powder layer 4 are easily joined and firmly clad. C3 can be produced.

  In the above embodiment, the metal layer constituting the dissimilar metal plate 3 is exemplified as the powder layer. However, the present invention is not limited thereto, and the metal powder constituting the metal base material 2 may be used. The metal powder constituting the material 2 and the metal powder constituting the dissimilar metal plate 3 may be mixed.

  FIG. 5 shows a schematic cross-sectional view of the clad material when the method for producing the clad material according to the present invention is used. In the manufacturing method of the clad material C4 shown in FIG. 5, two dissimilar metal plates 3A are used. The dissimilar metal plate 3A includes a first dissimilar metal plate 31A and a second dissimilar metal plate 32A, and the first metal powder is interposed between the first dissimilar metal plate 31A and the second dissimilar metal plate 32A. A first powder layer 41A is formed. In addition, a second powder layer 42 </ b> A in which a second metal powder is disposed is disposed between the second dissimilar metal plate 31 </ b> A and the metal base material 2.

  The first dissimilar metal plate 31A and the second dissimilar metal plate 32A are not limited thereto, but are the same metal here. Further, the first metal powder is composed of a metal having a property different from that of the metal constituting the dissimilar metal plate 3 </ b> A and the metal constituting the metal base material 2. The 2nd metal powder is comprised with the metal which comprises 3A of dissimilar metal plates.

  As shown in FIG. 5, the second powder layer 42A is disposed on the surface of the metal base material 2, and the first powder layer 41A is disposed on the upper surface between the first dissimilar metal plate 31A and the second dissimilar metal plate 32A. The laminated member sandwiching the two is disposed so that the second dissimilar metal plate 32A is in contact with the second powder layer 42A. In this state, the rotary tool 1 is pressed in a rotated state until the joining pin 12 reaches the vicinity of the boundary between the second dissimilar metal plate 32A and the second powder layer 42A. At this time, the shoulder 13 of the main body 11 of the rotary tool 1 is recessed into the first dissimilar metal plate 31A.

  The rotary tool 1 moves while rotating in a state of being inserted into the first dissimilar metal plate 31A, the first powder layer 41A and the second dissimilar metal plate 32A, so that the first and second dissimilar metal plates 31A, 32A is agitated by plastic flow, and the first and second dissimilar metal plates 31A and 32A are joined to each other. At this time, the metal powder of the first powder layer 41A is also agitated and diffused into the first and second dissimilar metal plates 31A and 32A, and the metal powder of the first metal powder layer 41A is dispersed in the dissimilar metal plate 3A. And joined. Further, the second dissimilar metal plate 32A plastically flows, so that the metal powder of the second powder layer 42A and the metal base material 2 plastically flow to form the second dissimilar metal plate 32A and the second powder layer 42A. The metal to be dispersed is dispersed inside the metal base material 2, and the second dissimilar metal plate 32A and the metal base material 2 are joined. By manufacturing in this way, it is possible to join the metal base material 2 and the dissimilar metal plate 3A in which the metal constituting the first powder layer 41A is dispersed.

  Thus, the powder layer 4A of the metal powder having the first and second dissimilar metal plates 31A and 32A and having different properties from the metal constituting the dissimilar metal plates 31A and 32A between the dissimilar metal plates 31A and 32A. The clad material C4 manufactured by friction stir in advance has the properties of the metal base material 2 and the properties of the metal constituting the dissimilar metal plate 3A and the metal constituting the first powder layer 41A. Can be combined. For example, when a metal base material having sufficient strength, a dissimilar metal plate having corrosion resistance and metal powder capable of improving wear resistance are joined, the clad material can ensure sufficient strength by the base material. In the surface where the dissimilar metal plates are joined, high corrosion resistance and wear resistance can be ensured.

  In this embodiment, the first powder layer 41A uses a metal powder different from the metal constituting the dissimilar metal plate 3A, but the same metal powder may be used. Further, a metal having a property different from that of the metal constituting the first and second dissimilar metal plates 31A and 32A between the first dissimilar metal plate 31A and the second dissimilar metal plate 32A as the dissimilar metal plate. Although the example having the powder layer 41A of powder is described as an example, the present invention is not limited to this, and more dissimilar metal plates may be used. At this time, the metal which comprises the powder layer arrange | positioned between dissimilar metal plates may each be a metal which has a different property, and may be a metal which has the same property.

  FIG. 6 shows a schematic cross-sectional view of the clad material when the method for producing the clad material according to the present invention is used. In the method of manufacturing the clad material C5 shown in FIG. 6, the metal base material 2B is formed in a curved shape, and the dissimilar metal plate 3B is disposed on the upper surface of the metal base material 2B.

  The dissimilar metal plate 3B shown in FIG. 6 is obtained by compressing and molding a dissimilar metal powder by a cold rolling method. Since the dissimilar metal plate 3B is formed by compression molding, the dissimilar metal plate 3B is easily arranged on the curved surface portion like the surface of the metal base material 2B. Moreover, since the dissimilar metal plate 3B is formed by compression molding, it is easy to stir with the rotary tool 1, and the clad material C5 can be easily manufactured as much. Further, since the metal powder constituting the dissimilar metal plate 3B is compression molded to form the dissimilar metal plate 3B, the dissimilar metal plate 3B can be formed into an arbitrary shape.

  In this embodiment, the powder of the dissimilar metal is compression-molded by the cold rolling method. However, the present invention is not limited to this, and the metal powder is made of metal without being alloyed or generating residual stress. A molding method that can be molded into a plate can be widely adopted.

  Moreover, the dissimilar metal slurry formed in the slurry form can be used instead of the dissimilar metal plate. Since the dissimilar metal slurry can flow on the surface of the metal base material, even if the surface of the metal base material is formed in a shape other than a flat surface, the dissimilar metal slurry can be easily disposed substantially uniformly.

  Each embodiment shown above arrange | positions the dissimilar metal plate 3 (3A) of the metal different from the metal base material 2 (2B) in the metal base material 2 (2B), and moves the rotary tool 1 rotating. Even when a clad material is made using a metal structure already installed in a factory or plant as a metal base material, it can be applied at the place where the metal structure is installed. It is also possible to partially stir and join.

  You may perform the manufacturing method of the cladding material using the above friction stirring in a vacuum. By performing frictional stirring in vacuum, unnecessary gas, especially oxygen can not be present on the joint surface between the metal base material and the dissimilar metal plate, so that the metal oxide is purified at the part being stirred. Can be prevented.

  Similarly, the metal base material and the dissimilar metal plate are moved by rotating the rotary tool 1 in a state where the metal base material and the dissimilar metal plate are immersed in a liquid that does not have dissolved oxygen or that has a reducing property. May be frictionally stirred. Since the construction is carried out in a liquid state, oxidation of the stirring portion can be prevented even if the construction environment is not evacuated, so that the clad material can be easily produced.

  As a clad material, for example, a metal base material is formed of an iron-based metal material to ensure strength, and aluminum is joined as a dissimilar metal to increase corrosion resistance on the iron-based metal base material. Can be mentioned. According to this clad material, the surface where aluminum is bonded is exposed to the portion where the corrosive liquid and / or gas contacts, and the other portion is formed of a ferrous metal material to ensure sufficient strength. be able to.

  Since the metal base material and the dissimilar metal are not heated to a temperature higher than the melting point, an intermetallic compound is not formed at the joint surface between the metal base material and the dissimilar metal, so that the clad is firmly joined so that embrittlement does not occur at the joint surface. The material can be manufactured. Moreover, since it is not melted, it is not necessary to consider the conditions depending on the melting points of the base metal and the dissimilar metal, so any combination of metals can be employed.

Drawing (A)-figure (D) are perspective views of a procedure of a manufacturing method of a clad material concerning the present invention. Drawing (A) and (B) are sectional views of a use state of a rotary tool used for a manufacturing method of a clad material concerning the present invention. It is sectional drawing which shows the state which is manufacturing the clad material using an example of the manufacturing method of the clad material concerning this invention. It is sectional drawing which shows the state which is manufacturing the clad material using an example of the manufacturing method of the clad material concerning this invention. It is sectional drawing which shows the state which is manufacturing the clad material using an example of the manufacturing method of the clad material concerning this invention. It is sectional drawing which shows the state which is manufacturing the clad material using an example of the manufacturing method of the clad material concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating tool 11 Main-body part 12 Joining pin 13 Shoulder part 2 Metal base material 21 Concavity and convexity 3 Dissimilar metal plate 4 Powder layer C1-C5 Clad material

Claims (13)

A metal (different metal) plate different from the metal base material is placed on the surface of the metal base material,
Inserting from the dissimilar metal plate side while rotating a tool having a projection shorter than the thickness of the dissimilar metal plate with the dissimilar metal fixed to the metal base material, moving the tool while rotating, and stirring by friction The metal base material and the dissimilar metal are diffused and joined to each other at the boundary,
The method for producing a clad material, wherein the tool is inserted such that a tip is near a boundary between the metal base material and the dissimilar metal plate.   The method for manufacturing a clad material according to claim 1, wherein a tip of the tool does not reach the metal base material.   The powder comprising at least one of a metal constituting the metal matrix or the dissimilar metal is disposed on a surface of the metal matrix, and the dissimilar metal is disposed on the powder. Item 3. A method for producing a clad material according to Item 2.   4. The method for producing a clad material according to claim 3, wherein irregularities are formed on a surface of the metal base material.   The plurality of dissimilar metal plates are provided, the plurality of dissimilar metal plates are laminated, and a powder having a predetermined property is disposed between the dissimilar metal plates. Manufacturing method of the clad material.   The method for producing a clad material according to any one of claims 1 to 5, wherein the dissimilar metal plate is obtained by molding a dissimilar metal powder into a plate shape.   The method for manufacturing a clad material according to any one of claims 3 to 6, wherein the metal powder is molded in accordance with a shape of a place where the metal powder is disposed. Place a slurry of a metal (dissimilar metal) different from the metal matrix on the surface of the metal matrix,
With the dissimilar metal slurry fixed to the metal base material, a tool having a projection shorter than the thickness of the dissimilar metal slurry is inserted while rotating from the dissimilar metal slurry side, the tool is moved while rotating, and friction stirring is performed. The metal base material and the dissimilar metal slurry are diffused and joined at the boundary,
The method for producing a clad material, wherein the tool is inserted such that a tip thereof is in the vicinity of a boundary between the metal base material and the dissimilar metal slurry.   The method for manufacturing a clad material according to claim 8, wherein a tip of the tool does not reach the metal base material.   The method for producing a clad material according to any one of claims 1 to 9, wherein the clad material is produced in a deoxygenated atmosphere.   The method for manufacturing a clad material according to claim 9, wherein the deoxidizing atmosphere is a vacuum.   The method for manufacturing a clad material according to claim 9, wherein the deoxygenated atmosphere is in a liquid that does not contain dissolved oxygen.   The method for manufacturing a clad material according to claim 9, wherein the deoxygenated atmosphere is in a reducing solution.

Images