JP2003112270A - Joining structure and joining method of different metallic material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining structure and joining method of different metallic materials which are capable of exhibiting excellent reliability by enhancing the impact strength of a joined part and are applicable to parts of apparatus for industrial and electric power purposes. SOLUTION: The joined structure of the different metallic materials formed by joining a first metallic material 1 essentially consisting of aluminum and a second metallic material 2 essentially consisting of niobium is set with an angle B with the joined surface end and free edge of the second material 2 in such a manner that this angle attains 5 to 70 deg.. The range of this angle B is high in the impact strength and the reliability of the joined part is greatly improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining technique for joining dissimilar metal materials of aluminum alloy and niobium alloy.

[0002]

2. Description of the Related Art Generally, in a rod-shaped or tubular joint, a joint structure of different kinds of metal materials in which different kinds of metal materials are joined is known. When joining dissimilar metal materials,
Joining methods such as friction welding and diffusion joining are used. 18A and 18B are explanatory views of a working example of friction welding.

First, as shown in FIG. 18 (a), metal materials 1 and 2 having the same diameter and different material characteristics are respectively gripped by a fixed shaft 3 and a rotary shaft 4 of a pressure welding device. Then, while rotating the metal material 2 by the rotating shaft 4, the metal material 1 fixed to the fixed shaft 3 is pressed against the end portion of the joint surface, and the portion to be joined is heated by friction energy while pressing force in the axial direction. And press upset to perform. When the metal materials 1 and 2 are bonded in this manner, as shown in FIG. 18B, burrs 5 having different amounts and shapes are formed on the axial cross section after the bonding, depending on the strength of each material. It

As a method for joining dissimilar metal materials, in addition to the above friction welding method, cold welding, hot welding,
Various techniques such as diffusion bonding, explosive pressure welding, forging welding, ultrasonic bonding, brazing, soldering, resistance welding, and a method using an adhesive have been proposed. For example, JP-A-6-47570
Japanese Unexamined Patent Publication No. 2003-242242 describes a method of joining metal materials having different thermal expansion coefficients by making the diameter of the material having the larger thermal expansion coefficient larger than the diameter of the material having the smaller thermal expansion coefficient. . According to this joining method, the residual stress generated at the joining interface can be relaxed and the joining strength can be increased. Further, in the hot pressure welding method of an aluminum material and a copper material described in Japanese Patent Application Laid-Open No. 4-143085, a convex copper material having a groove angle of 15 to 45 degrees is butted against the aluminum material and both are heated by energization to heat them. Are joined together. With this method, the tensile strength can be increased.

Further, in the technique described in Japanese Patent Application Laid-Open No. 1-282166, not the joining of metallic materials but the joining body of a ceramic material and a metallic material is improved. That is, the ceramic composition angle formed by a part of the peripheral portion of the bonding interface of the ceramic material and the surface of the bonded body is set to 80 degrees or less or 100 degrees or more. Further, according to the technique disclosed in Japanese Patent Laid-Open No. 1-282167, a curved surface having a radius equal to or larger than a predetermined value when the joint interface edge portion of a member having a small thermal expansion coefficient in a joint body of materials having different thermal expansion coefficients is viewed in the joint interface direction. It is formed into a shape. According to these conventional examples, thermal stress can be relaxed.

[0006]

In each of the above-mentioned conventional techniques, the residual conditions and thermal stress are relaxed or the tensile strength is improved by optimizing the joining conditions of the two materials. The joint strength can be increased.
However, in the joint structure of dissimilar metal materials, not only the static joint strength, but also a high level of impact strength when the joint part receives an impact is required.

In particular, when applying a joining structure of dissimilar metal materials to parts of equipment such as industrial equipment and electric equipment which generate vibration, it is extremely important to increase the impact strength of the joining portion. In addition, the issue of improving impact strength is
Not only the friction welding shown in FIG. 18, but also cold welding, hot welding, diffusion welding, explosive welding, forge welding, ultrasonic welding, brazing, soldering, resistance welding, and a different kind of material by an adhesive method. The same applies to the joint structure between them.

The present invention has been proposed in order to solve the above-mentioned problems, and an object thereof is to enhance the impact strength of a joint portion so that excellent reliability can be exhibited, and it is suitable for industrial and electric power applications. It is an object of the present invention to provide a joining structure and a joining method for dissimilar metal materials applicable to parts of equipment.

[0009]

In order to achieve the above object, in the invention of claims 1 to 4, a first metal material containing aluminum as a main component and a second metal containing niobium as a main component. The joining structure of dissimilar metal materials joined with materials has the following technical features. Claim 1
The invention of No. 2 is characterized in that the angle between the end of the joining surface of the second metal material and the free edge is set to be 5 degrees or more and 70 degrees or less or 92 degrees or more and 125 degrees or less. The invention of claim 2 is characterized in that the angles between the joining surface end of the first and second metal materials and the free edge are both set to less than 90 degrees. The invention of claim 3 is the first
Further, one of the angles between the end of the joining surface of the second metal material and the free edge is set to 90 degrees, and the other is set to less than 90 degrees. According to a fourth aspect of the present invention, in the joint structure for dissimilar metal materials according to any one of the first to third aspects, a length of a portion of the joint surface end portion of the second metal material that forms an angle with a free edge. It is characterized in that the dimension is 5% or more of the diameter of the second metal material from the edge of the joint surface. According to the inventions of claims 1 to 4, by setting the angle between the end portion of the joining surface of the metal material and the free edge to a value at which the impact strength is significantly increased, the reliability of the joining portion is significantly improved. You can Moreover, in the invention of claim 4, since it is possible to sufficiently secure the length dimension of the portion forming the angle with the free edge at the end portion of the joining surface of the metal material, there is no fear that the metal materials are displaced from each other, and the impact strength is ensured. Can be improved.

According to the invention of claims 5 to 7, the first metal material containing aluminum as a main component and the second metal material containing niobium as a main component are bonded via a bonding material made of aluminum. The joining structure of dissimilar metal materials has the following technical features. According to a sixth aspect of the present invention, when the thickness of the bonding material is t and the radial width of the ring is T, the bonding material is composed of a ring-shaped member (t / T)
It is characterized in that it is set to be <0.5. According to a seventh aspect of the present invention, the bonding material is formed of a round bar member, and when the thickness of the bonding material is t and the diameter of the round bar is D, (t / D) <0.5. Is set to. In the invention of claim 8, the joint material is composed of a plate-shaped member, and when the thickness of the joint material is t and the length of the short side of the plate is a, (t / a) <0. It is characterized in that it is set to be 5. In these inventions, the tensile strength can be increased and the reliability of the mechanical strength can be improved by limiting the size of the bonding material interposed between the first and second metal materials.

According to an eighth aspect of the present invention, in the joint structure of dissimilar metal materials according to any one of the first to seventh aspects, heat treatment is applied to a joint portion of the first and second metal materials. Characterize. In the invention of claim 8 as described above, the hardness of the metal material containing aluminum as a main component after the bonding can be restored to the original hardness by heat-treating the bonded portion between the metal materials. it can.

According to a ninth aspect of the present invention, in the joint structure for dissimilar metal materials according to any one of the first to eighth aspects, the reaction layer of the intermetallic compound in the first and second metal materials is 20 μm or less. It is characterized by being set so that According to the invention of claim 9 as described above, the first and second
By setting the reaction layer of the intermetallic compound in the metal material of 20 μm or less, it is possible to suppress the decrease in impact strength,
Excellent reliability can be ensured.

According to a tenth aspect of the present invention, in the joint structure for dissimilar metal materials according to any one of the first to ninth aspects, the electric resistance of the joint portion in the first and second metal materials is a base material. It is characterized in that it is set to be 1.3 times or less of the one having a higher electric resistance. According to the invention of claim 10, the electric resistance of the joint portion in the first and second metal materials is set to be 1.3 times or less of the one of the base materials having the higher electric resistance. As a result, the electric resistance at the joint portion becomes low, and heat generation during energization can be suppressed. Therefore, the reaction layer of the intermetallic compound does not grow, and high impact strength can be maintained.

According to an eleventh aspect of the present invention, in the joint structure for dissimilar metal materials according to any one of the first to tenth aspects,
The impact strength of the joint portion of the first and second metal materials is set to be 0.8 times or more that of the lower impact strength of the base material. Such claim 11
According to the invention, since the impact strength of the joint in the first and second metal materials is set to 0.8 times or more that of the lower impact strength of the base metal, both the joint and the base metal have excellent impact strength. The strength can be secured and the reliability can be improved.

According to a twelfth aspect of the present invention, in the joint structure for dissimilar metal materials according to any one of the first to eleventh aspects,
At least the fastening portion in the mechanical component of the industrial or power equipment is made of the second metal material, and the portions other than the fastening portion are made of the first metal material. According to a thirteenth aspect of the present invention, in the joint structure for dissimilar metal materials according to any one of the first to eleventh aspects, at least a portion where corrosion resistance is required in parts of mixing, dispersing and stirring equipment in a chemical plant is the first part. It is composed of the second metal material, and is composed of the first metal material except for the portion where the corrosion resistance is required. According to a fourteenth aspect of the present invention, in the joint structure for dissimilar metal materials according to any one of the first to eleventh aspects, at least a portion of a peripheral component of a contact of a power device exposed to an arc is the second metal material. And a portion other than the portion exposed to the arc made of the first metal material. In these inventions of claims 12 to 14, since the joint structure exhibits high impact strength, mechanical parts of industrial or electric power equipment, mixing, dispersion in a chemical plant,
This can be applied even when a strong impact is generated on the stirring device parts and the parts around the contactor of the power device. At this time, since niobium forming the second metal material has excellent heat resistance and corrosion resistance, durability and reliability of each component can be improved. Moreover, since a cheap and light metal material containing aluminum as a main component can be used for the other parts of each component, the cost and weight of the device can be reduced.

According to a fifteenth aspect of the present invention, a first metal material containing aluminum as a main component and a second metal material containing niobium as a main component are bonded via a bonding material made of aluminum. The joining method of (1) has the following technical features. According to a fifteenth aspect of the present invention, the bonding material is built up on the second metal material in advance, and then,
The first metal material is bonded to the bonding material. More specifically, in the method for joining dissimilar metal materials according to claim 15, friction welding, cold pressure welding, hot pressure welding, diffusion welding, and explosion are applied to the padding of the joining material to the second metal material. It is characterized by performing any one of pressure welding, forging welding, ultrasonic welding, brazing, soldering, resistance welding, molten metal injection, casting joint, and adhesive. According to the fifteenth aspect of the present invention, the bonding material containing aluminum as a main component is first overlaid on the second metal material containing niobium as a main component, and then the first metal containing aluminum as a main component. By adopting the method of joining the material to the joining material, the metallic material containing aluminum as the main component and the metallic material containing niobium as the main component can be quickly joined while interposing the joining material of aluminum.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION (1) First Embodiment [Structure] FIGS. 1 to 7 will be described below for a first embodiment corresponding to the invention described in claims 1 to 4 and 8 to 11. A specific description will be made with reference. All of the present embodiments shown in FIGS. 1 to 4 include a first metal material 1 containing aluminum as a main component,
The second metal material 2 containing niobium as a main component is joined. The metal material 1 containing aluminum as a main component is aluminum or aluminum alloy. Further, there is niobium or a niobium alloy as the metal material 2 containing niobium as a main component. The joining method is the friction welding method as in the conventional example shown in FIG. However, in the prior art, the angle A between the joining surface of the metal materials 1 and 2 and the free edge was approximately 90 degrees as shown in FIG. There is a feature in the setting of.

The ranges of the angles B, C, E and F between the joint surface of the metal materials 1 and 2 and the free edge are as follows. That is, in the example shown in (b) and (c) of FIG. 1 and (b) of FIG.
The angle B is set to 5 degrees or more and 70 degrees or less (corresponding to claim 1). Further, in the examples shown in (d) and (e) of FIG. 1 and (c) of FIG. 2, the angle C is set to 92 degrees or more and 125 degrees or less (corresponding to claim 1). 3 and 4
In the examples shown in (b) and (c), the angles E and E are both 9
It is set to less than 0 degrees (corresponding to claim 2). Further, in the examples shown in FIGS. 3 and 4 (d) and (e), one angle A is set to 90 degrees and the other angle F is set to less than 90 degrees (corresponding to claim 3). .

1 and 3 are examples of rod-shaped members having a solid interior, and FIGS. 2 and 4 are examples of tubular members having a hollow interior. 1 (b) and 1 (d), the cross section of the joint surface is curved, and FIGS. 1 (c) and 1 (e) are trapezoidal cross sections of the joint surface. Further, FIGS. 3 and 4 (b) and (d) show the outer surface of the joint portion as a straight line, and FIGS. 3 (c) and (e) show that the outer surface of the joint portion has a curved shape. Of.

Further, in the first embodiment, in the second metal material 2 containing niobium as a main component, the length dimension of the portion forming an angle with the free edge at the end of the joint surface is larger than that of the edge portion of the joint surface. Two
5% or more of the diameter of the metal material 2 is formed. Further, the joint between the first and second metal materials 1 and 2 is heat-treated, and the reaction layer of the intermetallic compound in both metal materials 1 and 2 is set to 20 μm or less. The electrical resistance and impact strength at the joint between the first and second metal materials 1 and 2 are set to be equal to the electrical resistance and impact strength of the base material. Specifically, the electrical resistance of the joint is 1.3 for niobium alloy (generally, niobium alloy has higher electrical resistance than aluminum alloy).
It is less than double, and the impact strength of the joint is one of the base materials with lower impact strength (generally aluminum alloy in general)
Set to 0.8 times or more.

[Operation and Effect] The operation and effect of the first embodiment having the above-mentioned structure are as follows. FIGS. 5 and 6 show the second metal material 2 containing niobium as a main component, and the angle between the edge of the joint surface and the free edge is 5 degrees from 2 degrees to 150 degrees, and the tensile test and the impact test are performed. It is a graph which shows the performed result. The tensile strength showed a constant value regardless of the angle formed with the free edge at the end of the joint surface (Fig. 5),
The impact strength is 9 at an angle between the free edge at the end of the joint surface of the second metal material 2 containing niobium as a main component and between 5 and 70 degrees.
Values between 2 degrees and 125 degrees are higher than the conventional value of 90 degrees (Fig. 6).

According to the first embodiment described above, the angle formed by the free edge at the end of the joint surface of the metal material 2 is set to a value at which the impact strength is significantly increased, so that the reliability of the joint is greatly increased. Improved. Moreover, in the first embodiment, since the length dimension of the portion forming the angle with the free edge at the end of the joint surface of the metal material 2 is sufficiently secured, the metal materials 1 and 2 do not shift from each other, An excellent impact strength can be surely obtained. Further, in the first embodiment, since the joint between the metal materials 1 and 2 is heat-treated, the hardness of the aluminum alloy forming the metal material 1 can be restored to the original hardness. it can. Furthermore, in the first embodiment, the reaction layer of the intermetallic compound in the metal materials 1 and 2 has a thickness of 20 μm.
Since it is m or less, the impact strength ratio can be suppressed to 0.8 or less as shown in the graph of FIG.

By the way, in the joining structure of the metallic materials 1 and 2 joined by friction welding, if the electric resistance of the joint is high, the joint heats up when energized, and the reaction layer of the intermetallic compound grows to lower the impact strength. May occur. But first
In the embodiment of the present invention, the electric resistance of the joint between the metal materials 1 and 2 is set to be equal to the electric resistance of the base material, so that the electric resistance at the joint between the metal materials 1 and 2 can be suppressed to a low level, and the current flow The heat generation at the time can be suppressed. Therefore, it is possible to prevent the growth of the reaction layer in the intermetallic compound, and it is possible to maintain high impact strength. Further, if the impact strength of the joint portion of the metal materials 1 and 2 is equal to or lower than the base material, fracture may occur at the joint portion. However, in the present embodiment, the impact strength of the joint portion of the metal materials 1 and 2 is the base material. Since it is set to be equal to that of the material, both the joint portion and the base material can secure excellent impact strength and reliability can be improved.

(2) Second Embodiment [Structure] Next, a second embodiment corresponding to the invention described in claims 5 to 7 will be described with reference to FIGS. 8 to 13. In the second embodiment, a first metal material 1 containing aluminum as a main component and a second metal material 2 containing niobium as a main component are bonded via a bonding material made of pure aluminum. And is joined based on the joining method according to claim 15.

The second embodiment is characterized by setting the dimensions of the bonding material interposed between the metal materials 1 and 2. That is, in the example shown in FIG. 8, the bonding material 6a is composed of a ring-shaped member, and when the thickness of the bonding material 6a is t and the radial width of the ring is T, (t / T) <0. .5 (corresponding to claim 6). Further, in the example shown in FIG. 9, the bonding material 6b is formed of a round bar-shaped member.
When the thickness of b is t and the diameter of the round bar is D, (t / D)
It is set to be <0.5 (corresponding to claim 7). Further, in the example shown in FIG. 10, the bonding material 6c is composed of a rectangular plate-shaped member, and when the thickness of the bonding material 6c is t and the length of the short side of the plate is a, (t / a) <
It is set to be 0.5 (corresponding to claim 8).

[Joining Method] In the second embodiment, the joining materials 6a to 6c are built up on the second metal material 2 in advance, and then the first metal material 1 is applied to the joining materials 6a to 6c. It is joined. Bonding material 6a to the second metal material 2
The padding of 6c is one of friction welding, cold welding, hot welding, diffusion welding, explosive welding, forging, ultrasonic welding, brazing, soldering, resistance welding, molten metal injection, casting joint, and adhesive. Is done in the same way.

[Operation and Effect] According to the second embodiment, the thickness t of the joining materials 6a to 6c interposed between the first and second metal materials 1 and 2 is limited, so that FIG. ~ Fig. 13
The tensile strength can be increased as shown in the graph. This improves the reliability of mechanical strength. In addition, in the second embodiment, the aluminum joining materials 6a to 6c are used.
On the second metal material 2 containing niobium as a main component,
Subsequently, by adopting a method of joining the first metal material 1 containing aluminum as a main component to the joining materials 6a to 6c,
The metal materials 1 and 2 can be quickly joined while interposing the joining materials 6a to 6c.

(3) Third Embodiment [Structure] Subsequently, a third embodiment corresponding to the invention of claim 12 is described.
The embodiment will be described with reference to FIGS. 14 and 15. FIG. 14 is an example of a mechanical part used for industrial equipment, and FIG. 15 is an example of a mechanical part used for a power circuit breaker. These mechanical parts transmit power from a power unit to other mechanical parts. To do.

Generally, niobium having high heat resistance is used for the mechanical parts, but the cost of the mechanical parts is high because niobium is expensive. Therefore, by using the metal material 2 containing niobium as the main component only in the fastening portion of the mechanical component and using the metal material 1 containing aluminum as the main component in the portions other than the fastening portion, the joint portion of aluminum and niobium is formed. The joining structure is applied to the present invention. At this time, the aluminum and niobium were friction-welded to each other, and at the joint interface, the angle between the joint surface end of the niobium alloy for machine structure and the free edge was 5 degrees or more and 70 degrees or less, and 92 degrees or more and 125 degrees or less.

[Advantages] The conventional aluminum and niobium friction welding members have a low impact strength and a low reliability of the joining structure, so that it is very difficult to apply them to mechanical parts. Therefore, by adopting the joining structure of the present invention having excellent impact strength, it is possible to partially replace expensive niobium with inexpensive and lightweight aluminum. As a result, the cost can be reduced by about 30% and the weight can be reduced by about 20%.

(4) Fourth Embodiment [Structure] Next, a fourth embodiment corresponding to the invention of claim 14 will be described with reference to FIG. FIG.
Is the mixing, dispersion of chemical plants used for industrial equipment,
It is an example of a stirring device. This component is for mixing, dispersing, and stirring liquids, liquids and solids, and solids in a chemical plant.

Generally, niobium having strong corrosion resistance is used for mixing, dispersing, and stirring equipment in a chemical plant, but since niobium is expensive, the price of parts is high. Therefore, the metal material 2 made of niobium is used only in the portion where the corrosion resistance is required, and the metal material 1 made of aluminum is used in the portion where the corrosion resistance is not required.
Is used to form a joint structure in which the present invention is applied to a joint portion of aluminum and niobium. At this time, aluminum and niobium were friction-welded to each other, and at the joint interface, the angle formed by the end of the joint surface of the mechanical structure niobium with the free edge was 5 degrees or more and 70 degrees or less, and 92 degrees or more and 125 degrees or less.

[Operation and Effect] In the fourth embodiment, as in the third embodiment, by adopting the joining structure of the present invention having excellent impact strength, expensive niobium is partially cheap and lightweight. 30%
The cost can be reduced to some extent and the weight can be reduced by about 20%.

(5) Fifth Embodiment [Structure] Subsequently, a fifth embodiment corresponding to the invention of claim 15 is described.
The embodiment will be described with reference to FIG. Figure 1
Reference numeral 8 is an example of a contactor peripheral component used for a power circuit breaker. In the power circuit breaker, the parts around the contact, which are opened and closed by the contact, are exposed to a high-temperature arc, and are used after heat-resistant coating on an aluminum material. Therefore, there is a problem that the price is high. Therefore, the metal material 2 containing niobium as a main component is used for the portion exposed to the arc, and the metal material 1 containing aluminum as the main component is used for the portion not exposed to the arc. It was adopted. That is, aluminum and niobium were friction-welded to each other, and at the joint interface, the angle formed by the end of the joint surface of niobium and the free edge was 5 degrees or more and 70 degrees or less, and 92 degrees or more and 125 degrees or less.

[Operation and Effect] In the fifth embodiment, as in the third and fourth embodiments, by adopting the joining structure of the present invention excellent in impact strength, expensive niobium can be partially removed. It is possible to replace it with cheap and lightweight aluminum, which can reduce the cost by about 30% and reduce the weight by about 20%.

[0036]

As described above, according to the present invention,
In a joint structure of a dissimilar metal material in which a first metal material containing aluminum as a main component and a second metal material containing niobium as a main component are joined, an end portion and a free edge of a joint surface of the second metal material By setting the angle between and 5 degrees or more and 70 degrees or less, or 92 degrees or more and 125 degrees or less to a value that significantly increases the impact strength, excellent impact strength can be secured and the reliability of the joint is improved. It is possible to significantly improve the sex.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a joint structure of rod-shaped dissimilar metal materials, in which (a) is a conventional technique and (b) to (d) are first examples of the present invention.
An embodiment of is shown.

FIG. 2 is a longitudinal sectional view showing a tubular joint structure of dissimilar metal materials, where (a) is a conventional technique, and (b) and (c) are the first of the present invention.
An embodiment of is shown.

FIG. 3 is a vertical cross-sectional view showing a joint structure of rod-shaped dissimilar metal materials, in which (a) is a conventional technique and (b) to (d) are the first of the present invention.
An embodiment of is shown.

FIG. 4 is a longitudinal sectional view showing a joint structure of rod-shaped dissimilar metal materials, in which (a) is a conventional technique and (b) to (d) are the first of the present invention.
An embodiment of is shown.

FIG. 5 is a graph showing the tensile strength of the first embodiment and the prior art.

FIG. 6 is a graph showing the impact strength of the first embodiment and the prior art.

FIG. 7 is a graph showing the relationship between the intermetallic compound layer thickness and the impact strength ratio.

FIG. 8 is a perspective view showing a ring-shaped joining structure according to the second embodiment of the present invention.

FIG. 9 is a perspective view showing a rod-shaped joining structure in the second embodiment of the invention.

FIG. 10 is a perspective view showing a plate-like joint structure according to the second embodiment of the present invention.

11 is a graph showing the tensile strength of the joint structure shown in FIG.

12 is a graph showing the tensile strength of the bonded structure shown in FIG.

13 is a graph showing the tensile strength of the joint structure shown in FIG.

FIG. 14 is a schematic structural diagram of a mechanical component of an industrial device to which the joining structure of different kinds of metal materials of the present invention is applied.

FIG. 15 is a schematic structural diagram of a mechanical component of a power circuit breaker to which a joining structure of different kinds of metal materials of the present invention is applied.

FIG. 16 is a schematic structural diagram of an agitation component for industrial equipment to which the joining structure of different metal materials of the present invention is applied.

FIG. 17 is a schematic structural diagram of parts around contacts of a power circuit breaker to which the joining structure of different kinds of metal materials of the present invention is applied.

FIG. 18 is a simplified explanatory view showing a procedure of joining by the present friction welding method, in which (a) shows before joining and (b) shows after joining.

[Explanation of symbols]

1,2 ... Metal material 3 ... Fixed axis 4 ... Rotary axis 5 ... Bali 6a ... Ring-shaped joining material 6b ... Round bar-shaped joining material 6c ... Plate-shaped joining material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akiko Suyama             2-1, Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa             Ceremony Company Toshiba Hamakawasaki Factory (72) Inventor Yoshiyasu Ito             2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa               Toshiba Keihin Office F-term (reference) 4E067 AA01 AA05 AB03 AD03 BA00                       BG00 DA13 DA17 DD01 EA03                       EA04 EC05

Claims (15)

[Claims] 1. A joint structure of a dissimilar metal material in which a first metal material containing aluminum as a main component and a second metal material containing niobium as a main component are joined together, wherein the second metal material is joined. The angle between the surface edge and the free edge is
A joint structure of dissimilar metal materials, which is set to be not less than 5 degrees and not more than 70 degrees or not less than 92 degrees and not more than 125 degrees. 2. A joint structure of dissimilar metal materials in which a first metal material containing aluminum as a main component and a second metal material containing niobium as a main component are joined together, wherein the first and second metals are A joint structure for dissimilar metal materials, characterized in that the angle between the end of the joint surface of the material and the free edge is set to less than 90 degrees. 3. A joint structure of dissimilar metal materials in which a first metal material containing aluminum as a main component and a second metal material containing niobium as a main component are bonded together, wherein the first and second metals are A joint structure for dissimilar metal materials, wherein one of the angles between the end of the joint surface of the material and the free edge is set to 90 degrees and the other is set to less than 90 degrees. 4. The length dimension of a portion of the joining surface of the second metallic material that forms an angle with the free edge is formed to be 5% or more of the diameter of the second metallic material from the joining surface edge portion. The joining structure of different kinds of metal materials according to any one of claims 1 to 3, wherein. 5. A joint structure of dissimilar metal materials in which a first metal material containing aluminum as a main component and a second metal material containing niobium as a main component are joined via a joining material made of aluminum, The bonding material is composed of a ring-shaped member, and is set such that (t / T) <0.5, where t is the thickness of the bonding material and T is the radial width of the ring. Bonding structure of dissimilar metal materials. 6. A joint structure of dissimilar metal materials in which a first metal material containing aluminum as a main component and a second metal material containing niobium as a main component are joined via a joining material made of aluminum, The bonding material is composed of a round bar-shaped member, and when the thickness of the bonding material is t and the diameter of the round bar is D,
A joint structure of dissimilar metal materials, characterized in that (t / D) <0.5. 7. A joint structure of dissimilar metal materials in which a first metal material containing aluminum as a main component and a second metal material containing niobium as a main component are joined via a joining material made of aluminum, The bonding material is composed of a plate-shaped member, and is set such that (t / a) <0.5, where t is the thickness of the bonding material and a is the length of the short side of the plate. A joint structure of dissimilar metal materials characterized by the above. 8. The heat treatment is applied to a joint portion of the first and second metal materials.
The joint structure of the dissimilar metal material as described in any one of 1 above. 9. The heterogeneous structure according to claim 1, wherein a reaction layer of the intermetallic compound in the first and second metal materials is set to be 20 μm or less. Bonding structure of metallic materials. 10. The electrical resistance of the joint portion of the first and second metal materials is set to be 1.3 times or less of that of the base material having the higher electrical resistance. The joined structure of different kinds of metal materials according to any one of claims 1 to 9. 11. The impact strength of the joint between the first and second metal materials is 0.8, which is lower than the impact strength of the base metal.
The joining structure of different kinds of metal materials according to any one of claims 1 to 10, wherein the joining structure is set to be twice or more. 12. A mechanical component of an industrial or power device, at least a fastening portion of which is made of the second metal material, and a portion other than the fastening portion is made of the first metal material. Item 12. A joined structure of different kinds of metal materials according to any one of items 1 to 11. 13. A part of mixing, dispersing, and stirring equipment in a chemical plant, wherein at least a portion requiring corrosion resistance is composed of the second metal material, and the portion other than the portion requiring corrosion resistance is the first metal material. The joining structure for dissimilar metal materials according to any one of claims 1 to 11, wherein the joining structure is made of 14. A part around a contact of a power device, wherein at least a portion exposed to an arc is made of the second metal material, and a portion other than the portion exposed to the arc is made of the first metal material. The joining structure of different kinds of metal materials according to any one of claims 1 to 11. 15. A method of joining dissimilar metal materials, comprising joining a first metal material containing aluminum as a main component and a second metal material containing niobium as a main component via a bonding material made of aluminum. A method for joining dissimilar metal materials, which comprises depositing the joining material on the second metal material in advance, and then joining the first metal material to the joining material.