JP2003001440A - Membrane for corner friction stir welding member welding method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner corner welding method which eliminates defects, etc., of melt welding, such as ruggedness of joint parts and the porosity within the joint parts. SOLUTION: The corner joint friction stir welding method for a pair of materials 15 and 16 to be welded which are arranged in such a manner that the angle formed by the inside surfaces attains a prescribed angle α, in which the inner side of the corner joint is provided with a projection 17 of a triangular prism shape and a rotary tool 19 is inserted to the materials 15 and 16 to be welded from the projection side of a rotary tool 19 and the materials 15 and 16 to be welded and a projecting part 17 are simultaneously joined. The member for corner joint friction agitation joining has the projection 17 of the triangular prism shape on one surface of the planar surface and is formed with one side of the triangular shape of the projection 17 on the extension line of the end faces of the joint part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel method of using the same or different materials such as aluminum, aluminum alloy, magnesium, magnesium alloy, copper, copper alloy, iron, iron alloy, titanium, titanium alloy, etc. rather than friction stir welding. TECHNICAL FIELD The present invention relates to a member for friction stir welding of a seam joint and a joining method thereof.

[0002]

2. Description of the Related Art In conventional corner welding by fusion welding,
Since it is fusion welding, there are the following problems. Reliability of the joint due to the occurrence of welding defects such as porosity,
Deterioration of work environment due to generation of fume and spatter,
Deformation due to solidification shrinkage of the fusion zone, correction of welding deformation,
In the case of active metals such as magnesium alloys and titanium alloys,
An inert gas shield and a vacuum device are required to prevent the oxidation of the fusion zone.

In order to solve the above problems caused by fusion welding, Japanese Patent Publication No. 7-505090 (FP0615480B1) discloses a friction stir welding method. In the friction stir welding method, when joining members, a rotating rotating tool is inserted into the joint, and the material heated by the friction heat between the rotating tool and the joint material is moved relatively by moving the rotating tool. It moves to the rear of the rotary tool to perform solid phase bonding. Since it is solid phase bonding, the above problems can be basically solved.

However, in the friction stir welding method, since the rotating rotary tool is forcibly inserted into the welding material and moved, the welding material receives a large force from the rotating tool. For example, when joining an aluminum alloy having a thickness of 5 mm, the force received by the joining material is about 1000 kgf. Therefore, it is important that the joining material is rigidly supported by using a strong backing material such as a steel plate. This can be achieved relatively easily with flat plate joining, but in the case of corner joining, it is necessary to devise the joint shape.

In Japanese Patent Publication No. 9-508073, corner joining by a friction stir welding method is shown. This is a rotating rotary tool consisting of a pin 1 and a shoulder 2 as shown in Figure 1.
This is a method in which the joining portion 7 is formed by inserting 3 into the vicinity of the abutting portion of the pair of joining materials 4 and 5 and moving the rotary tool 3 along the joining direction 6 in that state. This method
Outer-joint joining, slight unevenness occurs on the outer surface of the joining portion, because the joining material receives the force received from the rotary tool rigidly, for example, the backing materials 8 and 9 as shown in FIG. There is a problem that it needs to be arranged so as to withstand the force and is complicated.

Japanese Unexamined Patent Publication (Kokai) No. 11-320128 discloses an inner corner joining method. As shown in FIG. 2, this uses a probe composed of a presser block 10 and a rotary tool 11 to join the inner corners as shown in FIG. Bonded material 12 and
Rigidly fix 13 to the backing member 14 and
Friction stir welding is performed by moving a probe including the rotating tool 11 along the joint. However, in the method shown here, the probe is complicated because it consists of a pressing block and a rotary tool, and the pressing block is pressed against the material to be welded, but the rise of the material to be welded cannot be suppressed,
There are problems that high precision is required, it is difficult to manufacture the probe, the joint portion is curved, and the shape of the pressing block is not shown in detail.

The object of the present invention is to suppress the rise of the materials to be joined,
It is an object of the present invention to provide a corner friction stir welding member that does not have defects and irregularities found in melt welding and can cope with curved welding, and a welding method thereof.

[0008]

SUMMARY OF THE INVENTION The present invention is a friction stir welding method for a pair of materials to be joined in which the angle formed by the inner surfaces is a predetermined angle. The rotating tool is inserted into the material to be welded from the side of the protrusion, and the rotating tool is softened and agitated by frictional heat caused by contact between the rotating tool and the material to be welded while stirring. Is moved in the inserted state, and is joined via a protrusion provided on at least one of the members to be joined.

In a corner joint joining method for a pair of materials to be joined which are arranged so that the angle formed by the inner surface is a predetermined angle α, the two sides in contact with the surface of the corner joint have equal apex angle α. An inverted triangular prism shaped protrusion is provided, and a rotating rotary tool is inserted into the material to be welded from the side of the protrusion, and the frictional heat caused by the contact between the rotating tool and the material to be welded softens the material to be welded and rotates it with stirring. It is characterized in that the tool is moved in the inserted state and is joined via the projection as in the above.

According to the present invention, the corner friction stir welding is characterized in that one side of the flat plate surface has a triangular projection, and one side of the triangle of the projection is formed on an extension line of the end surface of the joining portion. It is in the member.

Specifically, the end surface of the joint portion is inclined with respect to the flat plate surface and has a triangular protrusion formed along the inclined surface, and the triangular shape of the protrusion is provided on an extension line of the inclined surface. A corner friction stir welding member is characterized in that one side is formed and a triangular protrusion is provided on one flat plate surface of the end portion of the joint portion.

It is most preferable that the above-mentioned protrusion is integrally provided on the member to be joined by extrusion, but it may be separately provided by using the same material as that of the member to be joined and integrally joined by joining.

According to the present invention, in a corner joint friction stir welding method for joining a pair of materials to be welded arranged at a predetermined angle to each other at a corner, a projection is provided at an inner corner of an end portion of at least one of the materials to be welded. It is characterized in that a rotary tool is inserted into the protrusion and friction stir welding is performed.

Furthermore, in the present invention, in a corner joint friction stir welding method for joining a pair of materials to be welded arranged at a predetermined angle to each other at a corner, a protrusion is formed at an inner corner of one end of the material to be welded. In the friction stir welding method for corner joints, which is provided, a rotary tool is inserted into the protrusion to perform friction stir welding, and a pair of materials to be welded arranged at a predetermined angle are welded to each other at a corner. Protrusions are provided at the inner corners of both end portions of the material, the protrusions are in contact with each other, a rotary tool is inserted into the protrusions, and friction stir welding is performed.

Further, in the above-described friction stir welding method for corner joints, the material to be welded is the above-mentioned welding member.

In the present invention, it is preferable that the member to be joined is fixed to a backing jig and friction stir welding is performed by inserting a rotary tool, and the member to be joined is provided with a fixing hole for the jig. This results in a sound bond.

FIG. 4 is a sectional view for explaining the corner joint friction stir welding method of the present invention. That is, the protrusion 17 is arranged in the corner portion of the pair of joining materials 15 and 16, and these are fixed to the backing member 18 rigidly by a clamp mechanism (not shown). Next, the rotating tool 19 which rotates is inserted as shown in FIG. 5, and the rotating tool 19 is further moved along the corners to join them. The protrusion 17 is not formed integrally with the material 16 to be bonded, but is made of the same material as the material to be bonded,
The materials to be joined are joined together at the same time as the joining, and push-up during joining is prevented. The width of the side of the protrusion 17 on the rotary tool side is preferably larger than the diameter of the shoulder of the rotary tool.

At this time, the protrusion 17 preferably has an inverted triangular prism shape having the same apex angle α as the angle α formed by the corners, and more preferably an inverted isosceles triangle. When performing friction stir welding, the material to be welded needs to be fixed to the rigid. For example, when the length of the material to be welded becomes long, it becomes difficult to fix the protrusion 17 to the rigid. Also, when the rotating tool is moved during welding, the material to be welded receives a force from the rotating tool even in the traveling direction of the rotating tool, so the rigidity of the protrusion itself is insufficient for elongated protrusions, and deformation or rising of the protrusions does not occur. Occur. Therefore, it is desirable that the protrusion 17 is integral with at least one of the pair of materials 15 and 16 to be joined. For example, in the case shown in FIG. 6, the protrusion 1
7 is formed integrally with the material 16 to be joined,
Pushing up at the time of joining is prevented. The width of the side of the protrusion 17 on the rotary tool side is preferably larger than the diameter of the shoulder of the rotary tool.

FIG. 7 is a sectional view for explaining another corner joint friction stir welding method of the present invention. In the case shown in FIG. 7, the protrusion
17 (17a and 17b) is a part of the two members 15 and 16 to be joined. By thus integrating the protrusion 17 with the material to be joined, deformation of the protrusion 17 during joining can be avoided. The end surfaces of the joints 15 and 16 to be joined are inclined with respect to the flat plate surface, and triangular protrusions 17a and 17b are formed along the inclined surface.
And one side of the triangle of the protrusion is formed on the extension line of the inclined surface. The length of the sides of the protrusions 17a and 17b on the rotary tool side is preferably not less than half the diameter of the shoulder of the rotary tool.

Further, the thickness of the pair of materials 15 and 16 to be joined is t ₁
And t ₂ (≧ t ₁ ), the height h of the protrusion 17 is preferably h ≧ t _1/2, that is, half or more of the thinner plate thickness of the pair of materials to be joined. This is because the shape of the rotary tool is increased by increasing the width w of the upper surface of the inverted triangular prism shape to some extent. That is, when the width w becomes small, the shape of the rotary tool becomes small and the strength cannot be maintained, and there is a concern that the rotary tool may be damaged during welding. The corner-joining member in which the above-mentioned projections are integrated with the material to be joined may be produced by, for example, extrusion molding. That is, by manufacturing the joining member by forming the holes of the extrusion die as described above, it becomes possible to reduce the member manufacturing cost.

Shoulder diameter of the rotary tool 19 used
D is preferably approximately equal to width w. This is because when the diameter D of the shoulder portion becomes extremely larger than the width w, the shoulder portion 20 bites into the materials 15 and 16 to be joined and cuts.

In the above corner joining, many metallic materials such as aluminum or aluminum alloy, magnesium or magnesium alloy, copper or copper alloy, iron or iron alloy, titanium or titanium alloy, nickel or nickel alloy, etc. Applicable to the compound. In addition, according to the present invention, it is possible to join the corner portions even if the corner portions are linear one-dimensional, planar curved two-dimensional, and arbitrarily curved three-dimensional.

Further, as in the present embodiment shown in FIGS. 11 and 12, the members to be joined 15 and 16 may be arranged in V-shape, L-shape or the like in the vertical direction, and the arrangement is not limited to this. That is, it goes without saying that the materials 15 and 16 to be joined and the rotary tool 19 may be in a relative relationship. In FIG.
Triangular protrusions 17 are provided on both sides of the end of the material to be bonded 21, and the material to be bonded 21 is bonded to both sides of the material to be bonded 23 which is a flat plate in the same manner as described above.

As described above, conventionally, when the rotary tool is inserted into the material to be welded at the time of welding, the material to be welded receives the force pushed up by the screw groove provided in the rotary tool, so that a healthy welding can be performed. However, the force is suppressed by the protrusions provided on the material to be welded according to the present invention, so that the corner friction stir welding that does not have defects or irregularities and can cope with curved welding can be obtained.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION (Example 1) The specific content of the specific friction stir welding of the present invention is shown below. As shown in FIG. 9, materials 15 and 16 to be joined were aluminum alloys having a plate thickness of 8 mm and a length of 1 m, and were manufactured by extrusion processing. Protrusion 17
Is an inverted isosceles triangular prism shape integrated with the material to be welded 16,
p = 6 mm. That is, the height h = 6 / √2 ≒ 4.24mm,
The width w = 6√2≈8.49 mm and the apex angle α = 90 °. The rotary tool 19 is tool steel, and the diameter of the shoulder portion 20 is D = 9 mm. The joining procedure is as follows:
Was rigidly fixed to a backing member (not shown). Next, the rotary tool 19 was rotated at 1000 rpm and inserted into the materials 15 and 16 to be bonded from the side of the protrusion 17. At this time, the shoulder portion 20 was inserted into the protrusion 17 by about 0.1 mm. Next, the rotating tool 19 was moved at 300 mm / min along the joining line at the corner to join them.
At this time, the rotary tool 19 was tilted backward by 3 ° with respect to the moving direction of the rotary tool. The materials 15 and 16 to be joined are both joined to the backing member 18 by fixing them with bolts through fixing holes.

As described above, the rotary tool has been conventionally used for joining.
By inserting 19 into the material to be welded, the material to be welded receives a force pushed up by the screw groove provided in the rotary tool 19, and a healthy joint cannot be made, but it was provided to the material to be welded in this example. The force was suppressed by the protrusions 17, and there was no defect or unevenness, and a stir joint friction stir welding capable of handling curved welding was obtained.

FIG. 10 is a view showing the external appearance of a corner joint part which is friction stir welded and the outside thereof. As shown in FIG. 10, all were flat, and it was confirmed that the pair of materials to be bonded were firmly bonded to each other.

(Embodiment 2) Another embodiment of the present invention will be described below. As shown in FIG. 11, the materials 15 and 16 to be joined are copper alloys having a plate thickness of 12 mm. The protrusions 17a and 17b are the members to be joined 15
It is an inverted isosceles triangular prism shape integrated with 16 and 16 and drawing p = 9mm
Is. That is, height h = 9 / √2 ≒ 6.36mm and width w = 9
√2 ≈ 12.7 mm and the apex angle α = 90 °. Rotating tool 1
9 is super hard, and the diameter D of the shoulder portion 20 is 13 mm.
The joining procedure was similar to that in Example 1, and first, as shown in FIG. 11, the materials 15 and 16 to be joined were rigidly fixed to a backing member (not shown). Next, rotate the rotary tool 19 at 1300 rpm to make the protrusion 1
It was inserted into the materials 15 and 16 to be joined from the 7 side. At this time, the shoulder portion 20 was inserted into the protrusion 17 by about 0.1 mm. Then rotate tool
19 was moved along the joining line at the corner at 200 mm / min for joining. At this time, the rotary tool 19 was tilted backward by 3 ° with respect to the moving direction of the rotary tool. With the above method, the corner joining could be easily performed.

As described above, the force is suppressed by the protrusions 17 provided on the materials to be welded in this embodiment, and the corner friction stir welding having no defects or irregularities and capable of dealing with curved welding was obtained. In addition, it was confirmed that the appearance of the corner joint and the outside thereof, which were carried out by the above method, were both flat, and that the pair of materials to be joined were firmly joined to each other.

(Embodiment 3) A sectional view of an application example of the present invention to a rib structure component is shown in FIG. The component is a cross-shaped aluminum rib structure, and the members to be joined 21 and 22 having the protrusions 17 are joined together.
Is joined to a flat member 23 by friction stir welding. The manufacturing method of this component is shown in FIG. The joining conditions were the same as in Example 2. First, the materials to be joined 21 and 23 are fixed to a jig (not shown). Next, the rotating rotating tool 19 is inserted into the protrusion 17 on the right side of the paper surface as shown in FIG. 13 (a), and the rotating tool 19 is moved in the depth direction of the paper surface to be joined. Next in Figure 13
As shown in (b), join the parts on the left side of the paper in the same way. In this way, the T-shaped member 24 in which the joined materials 21 and 23 are integrated is produced. Next, as shown in FIG.
2 and the T-shaped member 24 are joined in the same manner. According to this embodiment, a component having excellent reliability at the joint can be obtained.

As described above, the protrusions 17 provided on the materials to be joined of this embodiment suppressed the force, and the corner friction stir welding with no defects or irregularities and capable of dealing with curved welding was obtained. Also, it was confirmed that the appearance of the corner joint and the outside thereof, which were carried out by the above-mentioned method, were both flat and had good dimensional stability and good appearance, and that the pair of materials to be joined were firmly joined to each other.

[0032]

EFFECTS OF THE INVENTION According to the present invention, the joint is flat, there are no defects such as porosity, the reliability is high, and there is no fume or spatter that can be seen in welding, and the work environment is excellent. It is possible to form a small corner joint.
In addition, the joint is inside the corner and the appearance is good.

[Brief description of drawings]

FIG. 1 is a perspective view showing a conventional outer corner joint friction stir welding.

FIG. 2 is a perspective view of a rotary tool for friction stir welding of a corner joint using a conventional pressing block.

FIG. 3 is a cross-sectional view showing a conventional internal corner joint friction stir welding method using a pressing block.

FIG. 4 is a cross-sectional view showing a corner joint friction stir welding method of the present invention.

FIG. 5 is a sectional view showing a corner friction stir welding method of the present invention.

FIG. 6 is a cross-sectional view showing a corner joint friction stir welding method of the present invention.

FIG. 7 is a sectional view showing a corner joint friction stir welding method of the present invention.

FIG. 8 is a sectional view showing details of the corner joint friction stir welding method of the present invention.

FIG. 9 is a cross-sectional view showing a corner joint friction stir welding method of Example 1.

FIG. 10 is a diagram showing an external appearance of a corner joint friction stir welding portion of Example 1.

FIG. 11 is a cross-sectional view showing a corner joint friction stir welding method of Example 2.

FIG. 12 is a cross-sectional view showing a corner joint friction stir welding method of Example 3.

13 is a cross-sectional view showing the manufacturing procedure of the corner joint friction stir welding method of Example 3. FIG.

[Explanation of symbols]

1 ... Pin, 2 ... Shoulder, 3 ... Rotating tool, 4 ... Joined material, 5 ... Joined material, 6 ... Joining direction, 7 ... Joined part, 8 ... Backing material, 9 ... Backing material, 10 ... Presser foot Block, 11 ... Rotating tool, 12 ... Joined material, 13 ... Joined material, 14 ... Backing member, 15
Material to be bonded, 16 Material to be bonded, 17, 17a, 17b ... Protrusion, 18 ...
Backing member, 19 ... Rotating tool, 20 ... Shoulder part, 21 ...
Materials to be bonded, 22 ... Materials to be bonded, 23 ... Materials to be bonded, 24 ... T-shaped members.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuhiko Sakamoto             7-1-1, Omika-cho, Hitachi-shi, Ibaraki Prefecture             Inside the Hitachi Research Laboratory, Hitachi Ltd. (72) Inventor Satoshi Hirano             7-1-1, Omika-cho, Hitachi-shi, Ibaraki Prefecture             Inside the Hitachi Research Laboratory, Hitachi Ltd. (72) Inventor Kuniyoshi Okamura             7-1-1, Omika-cho, Hitachi-shi, Ibaraki Prefecture             Inside the Hitachi Research Laboratory, Hitachi Ltd. F-term (reference) 4E067 AA02 AA05 AA06 AA07 AA12                       AA26 BG00 DA13 EC00

Claims (9)

[Claims] 1. A member for friction stir welding of a corner joint, wherein one side of the flat plate surface has a triangular protrusion, and one side of the triangle of the protrusion is formed on an extension line of the end face of the joint portion. . 2. The end face of the joint portion is inclined with respect to the flat plate surface, and has a triangular protrusion formed along the inclined face, and one side of the triangular shape of the protrusion is on an extension line of the inclined face. A member for friction stir welding of a corner joint, which is characterized by being formed. 3. A member for friction stir welding of a corner joint, comprising a triangular protrusion on one flat plate surface of an end portion of the joint portion. 4. The friction stir welding of a corner joint according to any one of claims 1 to 3, wherein a fixing hole is provided to a backing jig when performing friction stir welding by inserting a rotary tool. Parts. 5. In a corner joint friction stir welding method for joining a pair of materials to be welded arranged at a predetermined angle to each other by a corner, at least one of the materials to be welded is provided with a projection at an inner corner of an end portion thereof. A friction stir welding method for corner joints, characterized in that a rotary tool is inserted into the protrusion and friction stir welding is performed. 6. A method of friction stir welding of a joint to join a pair of materials to be joined arranged at a predetermined angle with a corner, wherein a protrusion is provided at an inner corner of one end of the material to be joined. A friction stir welding method for corner joints, characterized in that a rotary tool is inserted into the protrusion to perform friction stir welding. 7. A method of friction stir welding of a joint to join a pair of materials to be joined, which are arranged at a predetermined angle, with a corner, wherein projections are provided at both inner corners of the end portions of the joining parts of the materials to be joined. A friction stir welding method for corner joints, wherein the protrusions are in contact with each other, a rotary tool is inserted into the protrusions, and friction stir welding is performed. 8. A joining member according to any one of claims 5 to 7, wherein in the method of friction stir welding of a joint, a method of joining a pair of members to be joined arranged at a predetermined angle to each other by a corner. A friction stir welding method for corner joints comprising: 9. The friction stir welding method for a joint according to claim 5, wherein the member to be joined is fixed to a backing jig and friction stir welding is performed by inserting a rotary tool.