JP6357566B2 - Method for manufacturing aluminum structural member - Google Patents

Description

  The present invention relates to a method for manufacturing an aluminum structural member, and more particularly to a method for manufacturing an aluminum structural member applied to a panel member or a structural member of a transport device such as an automobile.

  In recent years, for structural members such as automobile panels, pillars, and frames, the transition from steel plates to aluminum alloy plates has been studied from the viewpoint of weight reduction. In application to an aluminum alloy plate, not only a single (one piece) aluminum alloy plate is used, but also an aluminum alloy plate having a different thickness or an aluminum alloy plate having a different material may be used in combination.

  As a structure for joining two aluminum alloy plates, for example, as described in Patent Document 1, friction stir welding (FSW) is performed by abutting the end surfaces of two aluminum alloy plates. It is known to produce a bonding material by:

  In addition, as a technique for creating a tailored blank that joins and joins aluminum alloy plates with different plate thicknesses and materials, for example, two plate materials with different plate thicknesses are brought together, and the rotating tool is started from the butt step portion. A method has been proposed in which a joining tool is inserted in a state where the angle is tilted and joined while stirring (see Patent Document 2).

  Furthermore, as a technique for producing a tailored blank, for example, two aluminum alloy plates having different thicknesses are put on a hard backing and are brought into contact with each other, and a rotary tool is moved along the abutting portion while rotating. A method of friction stir welding of the aluminum alloy plate has been proposed (see Patent Document 3). Patent Document 3 also describes that when the upper end surfaces of the aluminum alloy plates are not aligned, the insertion angle of the rotary tool is inclined with respect to the butting surfaces of the alloy plates.

  Friction stir welding has the advantage that there is little distortion of the structure after joining because the heat input during joining is low. On the other hand, in the friction stir welding, the joining speed is significantly lower than that of fusion welding such as laser beam welding. For this reason, in order to increase the productivity of friction stir welding, a special machine for friction stir welding with a special structure that joins a plurality of parts simultaneously is required. Another method for improving productivity is to heat and preheat the part before inserting the friction stir welding tool to soften the material, and then insert the friction stir welding pin to join. It has been proposed (see Patent Documents 4 and 5).

  In addition, a method of joining two plate materials having different plate thicknesses and joining them by laser welding has been proposed (see Patent Document 6). Furthermore, after welding with a laser etc., the method of rolling a press roller to a welding part and shaping a welding part is proposed (refer patent document 7).

JP 2002-224858 A JP 2002-35961 A JP 2000-167676 A International Publication No. 1999/39861 JP-T-2004-521747 JP 2016-19983 A International Publication No. 2012/114962

  If it is the method of patent document 4 and 5, since the aluminum material can reduce the heating amount by friction stirring, it can improve a joining speed. However, since aluminum material has high thermal conductivity and heat diffuses easily, a necessary amount of heat cannot be stably applied to the joint. As a result, there is a problem in that the softened state of the material varies, the welded portion is disturbed, and a predetermined joint strength cannot be obtained.

  Moreover, even if the joining speed is improved as compared with the normal friction stir welding, there is a problem that the speed is still low as compared with the melt joining (welding).

  Furthermore, in any of the methods disclosed in Patent Documents 1 to 5, depending on the setting of the depth of the stirring pin and the degree of wear of the pin, an unjoined portion (so-called kissing bond) may occur, and the tool (pin) is managed. There was a problem that it was complicated. In particular, when the thickness of one of the butted members is thin, sufficient agitation cannot be performed, so that a poorly joined portion is easily formed.

  In addition, in the joining method by laser welding of Patent Document 6, the joining speed is fast, and a poorly joined portion such as the above-mentioned kissing bond is difficult to occur. However, since the molten bead portion becomes a casting, a structural member such as a B pillar of an automobile is used. When press-molding, there is a possibility of breakage due to insufficient elongation. In addition, when there is a shrinkage or an uneven portion on the surface of the molten bead portion, the appearance is poor, and there is a possibility that it becomes a starting point of fatigue fracture.

  Furthermore, in patent document 7, although the unevenness | corrugation of a welded part is smoothed to some extent by pressing a welded part with a roller, since the cast structure part of a welded part remains, there exists a possibility of a fracture | rupture at the time of press molding.

  This invention is made | formed in view of the said matter, The objective is to provide the manufacturing method of the aluminum structure member with which the joining speed was quick and excellent in the quality and joining strength of the junction part.

The manufacturing method of the aluminum structural member formed by joining the first aluminum member and the second aluminum member according to the present invention includes a step of abutting the first and second aluminum members with each other to form an abutting portion, and the abutting portion comprising: welded, forming a weld bead portion continuous from the front surface to the back surface of the butt portion, viewed including the the steps of stirring the weld bead by welding tool rotating, the stirring process is definitive the weld bead portion It is performed at a high temperature state from the solidus temperature of the aluminum alloy to 100 ° C.

  Moreover, in the said manufacturing method, Preferably, the said stirring process leaves the said weld bead part in a plate | board thickness direction, and forms a friction stirring part.

  Further, in the above manufacturing method, preferably, the joining tool has a shoulder and a stirring pin disposed at a front end portion of the shoulder, and the stirring step includes a stirring pin of the joining tool on the weld bead portion. And the weld bead portion is stirred by the shoulder and the stirring pin.

  Moreover, in the said manufacturing method, Preferably, the said stirring pin is inserted in the said weld bead part from either one side of the plate | board thickness direction of the said 1st and 2nd aluminum member.

  Furthermore, in the manufacturing method, preferably, the stirring pin is inserted into the weld bead portion from both sides in the plate thickness direction of the first and second aluminum members.

Further, in the manufacturing method of an aluminum structural member formed by joining the first aluminum member and the second aluminum member having different plate thicknesses according to the present invention, the first and second aluminum members are butted together to form a butted portion. If, by welding the butted portion, and forming a weld bead portion continuous from the front surface to the back surface of the butt portion, a step of stirring the weld bead by welding tool rotating, only including, the stirring process , In a state of a high temperature from the solidus temperature of the aluminum alloy in the weld bead portion to 100 ° C.

According to another aspect of the present invention, there is provided a method of manufacturing an aluminum structural member in which a first aluminum member and a second aluminum member thicker than the first aluminum member are butt-joined, and the first and second aluminum members are butted together. A step of forming a butted portion having a step, and when the stepped side is a surface, a welding heat source is disposed on the surface side, the butted portion is welded, and the surface of the butted portion is changed from the surface to the back surface. A step of forming a continuous weld bead portion and a step of stirring the weld bead portion with a rotating joining tool, the stirring step from the solidus temperature of the aluminum alloy in the weld bead portion to 100 ° C. carried out at a high temperature condition, in the stirring step, the axis of the bonding tool, the said first and second aluminum members It is intended to tilt the first aluminum member side with respect to a direction perpendicular to the surface.

According to the present invention, there is provided a method for producing an aluminum structural member in which a first aluminum member and a second aluminum member thicker than the first aluminum member are butt-joined. At least the first aluminum member is placed on a backing member. A step of abutting the first and second aluminum members in a disposed state to form a butt portion where the surface of the first aluminum member and the surface of the second aluminum member are flat; and (2) Disposing the welding heat source on the surface side of the aluminum member, welding the butt portion, forming a weld bead portion continuous from the surface of the butt portion to the back surface, and the welding bead portion by the rotating joining tool It is seen containing a step of agitating the surface side, wherein the stirring step is a solid phase line of the weld bead portion definitive aluminum alloy It carried out at elevated temperature conditions of up to 100 ° C. from time.

  Moreover, in the said manufacturing method, Preferably, the said welding bead part is made into the said back surface side by the process which removes the said backing member from the said 1st and 2nd aluminum member with which the said weld bead part was stirred, and the said rotating joining tool. In the stirring step from the back side, the axial center of the welding tool is set to be perpendicular to the back side of the first and second aluminum members. Tilt to the side.

  Moreover, in the said manufacturing method, Preferably, it forms by laser welding.

  Furthermore, in the manufacturing method, preferably, in the step of forming the weld bead portion, the laser beam is irradiated while supplying the filler material.

  Moreover, in the said manufacturing method, Preferably, the shoulder of the said joining tool is convex shape.

According to the aluminum structural member manufacturing method of the present invention, the first and second aluminum members are butted together to form a butted portion, the butted portion is welded, and the weld bead portion connected from the front surface to the back surface of the butted portion is formed. forming, a step of stirring the weld bead by welding tool rotating, seen including, said stirring step is a high temperature state to 100 ° C. from the solidus temperature of the weld bead portion definitive aluminum alloy Done . As a result, it is possible to provide a method for producing an aluminum structural member having a high joining speed and excellent joint quality and joining strength.

Moreover, according to the manufacturing method of the aluminum structural member of the present invention, even when the plate thicknesses of the first and second aluminum members are different, the step of butting the first and second aluminum members with each other to form a butted portion; butt portion by welding, and forming a weld bead portion continuous from the front surface to the back surface of the butt section, viewed including the the steps of stirring the weld bead by welding tool rotating, the stirring step, the weld bead portion It is performed at a high temperature state from the solidus temperature of the aluminum alloy to 100 ° C. As a result, it is possible to provide a method for producing an aluminum structural member having a high joining speed and excellent joint quality and joining strength.

Moreover, according to the manufacturing method of the aluminum structural member in which the first aluminum member of the present invention and the second aluminum member thicker than the first aluminum member are butt-joined, the first and second aluminum members are butted together. , A step of forming a butt portion with a step, and a welding bead portion connected to the back surface from the surface of the butt portion by welding a butt portion by arranging a welding heat source on the surface side when the step side is the surface And a step of stirring the weld bead portion with a rotating joining tool. The stirring step is performed in a state of a high temperature from the solidus temperature of the aluminum alloy in the weld bead portion to 100 ° C., and in the stirring step, the shaft core of the welding tool is used as the first and second aluminum members. The first aluminum member is inclined with respect to a direction perpendicular to the surface of the first aluminum member. As a result, it is possible to provide a method for producing an aluminum structural member that has a high joining speed and is excellent in the quality / appearance and joining strength of the joint.

Furthermore, according to the method for manufacturing an aluminum structural member in which the first aluminum member of the present invention and the second aluminum member thicker than the first aluminum member are butt-joined, at least the first aluminum member is placed on the backing member. The first and second aluminum members are butted together to form a flat butted portion between the surface of the first aluminum member and the surface of the second aluminum member, and the first and second aluminum members Arranging a welding heat source on the front surface side of the steel plate, welding the butt portion, forming a weld bead portion continuous from the surface of the butt portion to the back surface, and stirring the weld bead portion from the surface side by a rotating joining tool; , only contains the stirring step, the weld bead portion definitive of the aluminum alloy from the solidus temperature to 100 ° C. high temperature It is carried out in the state. As a result, it is possible to provide a method for producing an aluminum structural member that has a high joining speed and is excellent in the quality / appearance and joining strength of the joint.

It is a principal part perspective view of the manufacturing apparatus for enforcing the manufacturing method of the aluminum structural member which concerns on 1st Embodiment of this invention. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of 1st Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of 1st Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of 1st Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of 1st Embodiment. FIG. 3 is a plan view of an aluminum structural member manufactured by the manufacturing method of the first embodiment (in which frictional stirring is stopped halfway to show a joined state). It is plate | board thickness direction sectional drawing of the aluminum structural member manufactured by the manufacturing method of the 1st modification of 1st Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member manufactured by the manufacturing method of the 2nd modification of 1st Embodiment. It is a plate thickness direction sectional view of the aluminum structural member by which usual friction stir welding was carried out. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of the 3rd modification of 1st Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member manufactured by the manufacturing method of the 3rd modification of 1st Embodiment. It is a principal part perspective view of the manufacturing apparatus for enforcing the manufacturing method of the aluminum structural member which concerns on 2nd Embodiment of this invention. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of 2nd Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of 2nd Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of 2nd Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of 2nd Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member manufactured by the manufacturing method of the modification of 2nd Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member joined by normal friction stirring. It is an axial direction sectional view showing one example of a joining tool used for carrying out the present invention. It is an axial direction sectional view showing one example of a joining tool used for carrying out the present invention. It is an axial direction sectional view showing one example of a joining tool used for carrying out the present invention. It is a principal part perspective view of the manufacturing apparatus for enforcing the manufacturing method of the aluminum structural member which concerns on 3rd Embodiment of this invention. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of 3rd Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of 3rd Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of 3rd Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member manufactured by the manufacturing method of 3rd Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of the modification of 3rd Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member for demonstrating the manufacturing method of the modification of 3rd Embodiment. It is plate | board thickness direction sectional drawing of the aluminum structural member manufactured by the manufacturing method of the modification of 3rd Embodiment. It is a plate thickness direction sectional view of the aluminum structural member by which usual friction stir welding was carried out.

  Hereinafter, the manufacturing method of the aluminum structure member concerning each embodiment of the present invention is explained in detail with reference to drawings.

(First embodiment)
FIG. 1 is a perspective view of a main part of a manufacturing apparatus used for carrying out the first embodiment of the present invention. The manufacturing apparatus 10 includes a surface plate 11 on which the first and second aluminum members 1 and 2 to be joined to each other are placed, a laser device 20, and a friction stirrer 30.

<Laser device 20>
The laser device 20 irradiates the laser beam X from the laser head 21 toward the abutting portion 3 of the first and second aluminum members 1 and 2 to form the weld bead portion 4 over the entire plate thickness direction of the abutting portion 3. To do.

The laser source of the laser device 20 is not particularly limited, but may be a YAG laser, a CO ₂ laser, a fiber laser, a disk laser, a semiconductor laser, or the like. Further, the irradiation direction of the laser beam X may be a direction along the surface of the abutting portion 3, may be a vertical direction, or is a direction inclined with respect to the vertical direction as shown in FIG. Also good.

  In laser welding, it is preferable to perform welding while supplying the filler material 23 from the filler material supply nozzle 22 as necessary. By using the filler material 23, the amount of flowing material can be increased, and a smooth joined shape after stirring can be easily obtained.

  As the filler material 23, an aluminum filler material (JIS Z3232: 2000) such as JIS4043, 4047, 5554, 5356, 5183 can be appropriately used. In the case where the first aluminum member 1 and the second aluminum member 2 are 5000 series and 6000 series alloys, the use of JIS5554 can suppress the adhesion of smut to the welded portion while maintaining high joint strength. preferable.

<Friction stirrer 30>
As shown in FIG. 2C, the friction stirrer 30 has a stirring pin (or a probe) 31 and a shoulder 32, and includes a rotating joining tool 33. Further, the joining tool 33 is located on the downstream side with respect to the laser head 21 in the moving direction Y of the laser head 21 and the joining tool 33 and is disposed above the weld bead portion 4. The friction stirrer 30 stirs the weld bead portion 4 by tracing the weld bead portion 4 while rotating the stir pin 31 into the weld bead portion 4 solidified after laser welding. Thereby, a part of the weld bead portion 4 is changed from a cast structure to a modified structure. Therefore, the bending and tensile strength after joining becomes higher than joining by laser welding alone.

  In addition, the height of the stirring pin 31 can be appropriately set according to the thickness of the aluminum members joined to each other, as will be described below.

  Unlike normal friction stir welding (FSW), the insertion depth of the stirring pin 31 can be shallow because it is not necessary to perform welding by friction stirring. Thereby, since the load concerning the stirring pin 31 becomes small, it can stir at a speed | rate (movement speed on a butt line) faster than normal friction stir welding. Further, in friction stir welding, burrs increase in proportion to the insertion depth of the agitation pin 31, but according to the method of the present embodiment, the generation of burrs can be suppressed because the insertion depth is shallow. The stirring pin 31 may have a smooth surface (shaft surface), or may have a screw on the pin. When there is a screw, the stirrability is further improved.

  In addition, the outer diameter of the shoulder 32 is designed to be larger than the width of the weld bead portion 4 so that the entire weld bead portion 4 formed on the surface side can be stirred.

  In the manufacturing apparatus 10 of the present embodiment, the laser head 21 and the welding tool 33 may be unitized. In this case, the laser head 21 and the welding tool 33 are integrally moved relative to the surface plate 11 by a driving device (not shown). Therefore, friction stirring can be performed in one step with laser welding.

  Further, as in the present embodiment, the laser head 21 and the welding tool 33 are arranged at close positions, and friction stirring is performed from the solidus temperature (520 to 580 ° C.) of the aluminum alloy in the weld bead portion 4 to 100 ° C. By carrying out in the state of high temperature, the speed of friction stirring can be improved significantly.

  However, laser welding and friction stirring need not be performed simultaneously, and may be performed separately. In that case, friction stir may be performed on the weld bead portion fluidized by laser welding, or friction stir may be performed on the solidified weld bead portion. Further, the friction stirrer 30 may be configured separately from the laser device 20. That is, after the laser welding of the butt portion 3 (first step) is completed by the laser device 20, the joined aluminum structural member is disposed in the friction stirrer 30 provided separately, and the friction stirring (second step) is performed. It may be done.

<First and second aluminum members 1, 2>
The first and second aluminum members 1 and 2 to be joined to each other are not limited to plate materials, and may be extruded shapes or forged materials.

The first and second aluminum members 1 and 2 contain aluminum or an aluminum alloy. The material of the alloy includes various types such as AA or JIS 6000 series alloy, 5000 series alloy, 7000 series alloy, 3000 series alloy, 2000 series alloy, etc. Alloy materials can be used. In addition, the first and second aluminum members 1 and 2 may be subjected to annealing, solution treatment, artificial aging treatment, and the like as necessary after joining according to the present embodiment.
In the illustrated example, the first and second aluminum members 1 and 2 have substantially the same thickness.

<Method for producing aluminum structural member>
Next, each process of the manufacturing method of an aluminum structural member is demonstrated using FIG. 2A-FIG. 2D.

  First, as shown in FIG. 2A, the first and second aluminum members 1 and 2 are placed on the surface plate 11, and the first aluminum member 1 and the second aluminum member 2 are butted together to form the butted portion 3. Then, as shown in FIG. 2B, the butted portion 3 is joined by laser welding to form a weld bead portion 4. At this time, the weld bead portion 4 is formed from the front surface to the back surface, that is, over the entire plate thickness direction of the butt portion 3 so that an unjoined portion does not occur in the butt portion 3.

  Accordingly, it is possible to prevent the so-called kissing bond portion 6 (the unjoined portion of the butted portion or the portion where the joining is extremely weak) that may occur in the friction stir welding as shown in FIG.

  Next, as shown in FIG. 2C, the rotating welding tool 33 (stirring pin 31) is inserted into the weld bead portion 4, and the weld bead portion 4 and its surroundings are frictionally stirred. Since the weld bead portion 4 is once melted and solidified, it becomes a cast structure. However, the cast structure is modified by friction stirring, and as shown in FIGS. 2D and 3, a modified portion (friction stirring portion) 5. Is formed. In this case, the reforming part 5 is formed leaving the weld bead part 4 in the plate thickness direction. Since the cast structure is brittle, it is easy to break when a tensile load or bending load is applied to this part. However, by providing the metal structure reforming part 5 by friction stirring, the structure is refined and bonded to the cast structure. Strength can be improved.

In this embodiment, it is not necessary to insert the stirring pin 31 deeply in the thickness direction. Thereby, the load concerning the stirring pin 31 can be reduced and the joining speed can be increased.
In particular, since a member to be joined such as an automobile frame member is thick, in the case of normal friction stir welding, it takes a very long time. be able to.

  In the technique in which preheating is performed by laser or induction heating immediately before the friction stir welding, and the friction stir welding is performed immediately after that, although a certain improvement in the bonding speed can be obtained, the temperature due to the heat dissipation of the heat aluminum is obtained. Difficult to control, resulting in uneven joints. Moreover, the management of the wear state of the stirring pin 31 and the setting of the insertion depth are complicated.

  On the other hand, as in this embodiment, melt welding (penetration welding) is once performed to form a solidified weld bead portion 4, and then the weld bead portion 4 is modified by friction stir to generate kissing bonds. Disappears. Furthermore, management of the stirring pin 31 and setting of the insertion depth are simplified.

  As described above, according to the method for manufacturing an aluminum structural member in which the first aluminum member 1 and the second aluminum member 2 are joined, the first and second aluminum members 1 and 2 are abutted against each other to meet the abutting portion 3. , A step of irradiating the abutting portion 3 with the laser beam X to form a weld bead portion 4 continuous from the front surface to the back surface of the abutting portion 3, and a rotating stirring pin 31 inserted into the weld bead portion 4 And stirring the weld bead part 4. As a result, it is possible to provide a method for producing an aluminum structural member having a high joining speed and excellent joint quality and joining strength.

  In the above embodiment, in the friction stirring, the stirring pin 31 is inserted into the weld bead portion 4 from the laser beam X irradiation side in the plate thickness direction of the first and second aluminum members 1 and 2. The present invention is not limited to this.

That is, as a manufacturing method of the first modified example, in friction stirring, the stirring pin 31 is opposite to the laser beam X irradiation side (surface side) in the plate thickness direction of the first and second aluminum members 1 and 2 ( You may insert in the weld bead part 4 from the back surface side. Therefore, as shown in FIG. 4A, the modified portion 5 is formed on the side opposite to the side irradiated with the laser beam X (back side).

  Moreover, as a manufacturing method of the second modification, in friction stirring, the stirring pin 31 is inserted into the weld bead portion 4 from both sides (surface side, back side) of the first and second aluminum members 1 and 2 in the plate thickness direction. May be. Therefore, as shown in FIG. 4B, the reforming portions 5 are formed on both sides (front side and back side) of the first and second aluminum members 1 and 2 in the plate thickness direction. Thus, the strength of the joint can be further increased by inserting the stirring pin 31 from both sides of the first and second aluminum members 1 and 2 in the plate thickness direction and performing frictional stirring.

  Further, in the manufacturing method of the third modified example, as shown in FIG. 6A, the tool 33 can be configured by only the shoulder 32 without the stirring pin 31. In this case, since the weld bead portion 4 is stirred only by the shoulder 32, the stirring can be performed at a high speed.

  In addition, the modification part 5 formed in this case comes to be formed only in the surface layer part of the 1st aluminum member 1 and the 2nd aluminum member 2, as shown to FIG. 6B.

(Second Embodiment)
Next, the manufacturing method of the aluminum structural member which concerns on 2nd Embodiment of this invention is demonstrated in detail with reference to drawings. 2nd Embodiment is a manufacturing method applied when the board thickness of the 1st, 2nd aluminum members 1 and 2 joined mutually differs from each other. Specifically, as shown in FIG. 8A, the second aluminum member 2 is thicker than the first aluminum member 1. The first and second aluminum members 1 and 2 are the same as in the first embodiment except for the thickness.
Moreover, the manufacturing apparatus 10 used in order to implement 2nd Embodiment is the structure provided with the surface plate 11, the laser apparatus 20, and the friction stirrer 30, similarly to 1st Embodiment. Description of the same or equivalent parts as those in the first embodiment will be omitted or simplified.

  Hereinafter, each process of the manufacturing method of the aluminum structural member of 2nd Embodiment is demonstrated using FIG. 7, FIG. 8A-FIG. 8D.

  First, as shown in FIG. 8A, the first and second aluminum members 1 and 2 are placed on the surface plate 11, and the first aluminum member 1 and the second aluminum member 2 are abutted to form a butt portion 3 having a step. Form. Then, as shown in FIG. 8B, the butted portion 3 is joined by laser welding from the surface side, which is a stepped side, to form a weld bead portion 4. At this time, the weld bead portion 4 is formed from the front surface to the back surface, that is, over the entire plate thickness direction of the butt portion 3 so that an unjoined portion does not occur in the butt portion 3.

  Thereby, it is possible to prevent the so-called kissing bond portion 6 (the unjoined portion of the butted portion or the portion where the joining is extremely weak) that may occur in the friction stir welding as shown in FIG.

  Next, as shown in FIG. 8C, the welding tool 33 (stirring pin 31) that rotates to the weld bead portion 4 is placed on the surfaces of the first aluminum member 1 and the second aluminum member 2 so that the shaft core L of the welding tool 33 is on the surface. The welding bead portion 4 and its surroundings are inserted into the first aluminum member 1 at an angle θ from a direction perpendicular to the vertical direction (that is, a direction along the facing surface of the butting portion 3 before laser welding extending in the vertical direction). Friction stir. The inclination angle θ of the axis L of the welding tool 33 is set according to the difference in plate thickness between the first and second aluminum members 1 and 2, for example, 30 ° or less with respect to the perpendicular direction. Tilt within the range.

  Since the weld bead portion 4 is once melted and solidified, it becomes a cast structure, but the cast structure is modified by friction stirring. Further, during the modification, the first aluminum member 1 and the second aluminum member 2 are formed in a shape that smoothly connects without any step, and a reforming portion (friction stirring portion) 5 is formed as shown in FIG. 8D. In this case, the reforming part 5 is formed leaving the weld bead part 4 in the plate thickness direction. Since the cast structure is brittle, it is easy to break when a tensile load or bending load is applied to this part. However, by providing the metal structure reforming part 5 by friction stirring, the structure is refined and bonded to the cast structure. Strength can be improved.

  In this embodiment, it is not necessary to insert the stirring pin 31 deeply in the thickness direction. Thereby, the load concerning the stirring pin 31 can be reduced and the joining speed can be increased.

  In particular, since a member to be joined such as an automobile frame member is thick, in the case of normal friction stir welding, it takes a very long time. However, with the manufacturing method of this embodiment, the member to be joined is joined at a high joining speed. be able to.

On the other hand, as in this embodiment, melt welding (penetration welding) is once performed to form a solidified weld bead portion 4, and then the weld bead portion 4 is modified by friction stir to generate kissing bonds. Disappears. Furthermore, management of the stirring pin 31 and setting of the insertion depth are simplified.

  Further, even if the weld bead portion 4 has unevenness or shrinkage, the unevenness or shrinkage is eliminated by the flow of the joint due to stirring.

As described above, according to the method for manufacturing an aluminum structural member in which the first aluminum member 1 and the second aluminum member 2 are joined, the first and second aluminum members 1 and 2 are brought into contact with each other to form a step. The process of forming a certain abutting portion 3 and when the stepped side is the front surface, the abutting portion 3 is welded by irradiating the abutting portion 3 with a laser beam from the front surface side to the back surface. And a step of stirring the weld bead portion 4 by the rotating joining tool 33. In the stirring step, the axis L of the joining tool 33 is inclined toward the first aluminum member side with respect to the direction perpendicular to the surfaces of the first and second aluminum members 1 and 2. As a result, it is possible to provide a method for producing an aluminum structural member that has a high joining speed and is excellent in the quality / appearance and joining strength of the joint.
Other configurations and operations are the same as those in the first embodiment.

  Also in the present embodiment, it is preferable to perform welding while supplying the filler material 23 from the filler material supply nozzle 22 as necessary during laser welding (see FIG. 7).

  Further, the friction agitation is not limited to that performed on the laser beam X irradiation side (front surface side) as in this embodiment, but from both the front surface side and the opposite side (back surface side) of the front surface side. You can do it. That is, as in the modification shown in FIG. 9, the reforming part 5 may be formed on both the front surface side and the back surface side.

  Moreover, the joining tool 33 can use what is illustrated to FIG. 11A-FIG. 11C suitably. 11A and 11B, in which the shoulder 32 has a convex curved surface shape, can improve the press formability because the melted portion can be smoothed in a concave shape. On the other hand, the joining tool 33 shown in FIG. 11C has an effect of collecting the meat of the weld bead portion 4 on the shaft core side during friction stirring because the shoulder 32 has a concave tapered surface that becomes deeper toward the shaft core.

Furthermore, as illustrated in FIG. 11B, the joining tool 33 may not include the stirring pin 31 and may be configured by only the shoulder 32. In this case, since the weld bead portion 4 is stirred only by the shoulder 32, the stirring can be performed at a high speed.
Note that the shoulder 32 shown in FIGS. 11A and 11B is not limited to a convex curved surface shape, and may be a convex shape, or may be a convex tapered surface.

(Third embodiment)
Next, a method for manufacturing an aluminum structural member according to the third embodiment of the present invention will be described in detail with reference to the drawings. Similarly to the second embodiment, the third embodiment is a manufacturing method applied when the plate thicknesses of the first and second aluminum members 1 and 2 to be joined to each other are different from each other. Specifically, as shown in FIG. 13A, the second aluminum member 2 is thicker than the first aluminum member 1. The first and second aluminum members 1 and 2 are the same as in the first embodiment except for the thickness.
In addition, the manufacturing apparatus 10 used to implement the third embodiment includes the surface plate 11, the laser device 20, and the friction stirrer 30, as well as the first embodiment, and the surface plate 11. A backing member 40 disposed above and having a stepped portion is further provided. In addition, description is abbreviate | omitted or simplified about the same or equivalent part as 1st, 2nd embodiment of the manufacturing apparatus 10. FIG.

  Hereinafter, each process of the manufacturing method of the aluminum structural member of 3rd Embodiment is demonstrated using FIG. 12, FIG. 13A-FIG. 13C, and FIG.

  First, as shown in FIG. 13A, a backing member 40 having a stepped portion is arranged on the surface plate 11, and the first and second aluminum members 1 and 2 are abutted on the backing member 40, so that the first aluminum member 1 The surface and the surface of the second aluminum member 2 form a flat butted portion 3. Thereby, a step portion is formed on the back side of the first and second aluminum members 1 and 2.

Here, the “flat butted portion” includes a case where the surfaces of the first and second aluminum members 1 and 2 are shifted vertically by a dimension within 30% mm of the plate thickness of the first aluminum member.
The second aluminum member 2 is disposed on the flat surface plate 11 and a backing member corresponding to the plate thickness difference between the first and second aluminum members 1 and 2 is disposed adjacent to the butted portion 3. Even if it arrange | positions on 11 and arrange | positions the 1st aluminum member 1 on this backing member, a flat butt | matching part can be obtained. Further, the backing member may be divided at the butting portion 3 so that each backing member carries the first and second aluminum members 1 and 2 respectively.

  Then, as shown in FIG. 13B, the butted portion 3 is joined by laser welding from the flat surface side to form a weld bead portion 4. At this time, the weld bead portion 4 is formed from the front surface to the back surface, that is, over the entire plate thickness direction of the butt portion 3 so that an unjoined portion does not occur in the butt portion 3.

  Accordingly, it is possible to prevent the so-called kissing bond portion 6 (the unjoined portion of the butted portion or the portion where the joining is extremely weak) that may occur in the friction stir welding as shown in FIG. In addition, the material of the backing member 40 is preferably a material that is difficult to be bonded to an aluminum bonding material, such as copper or ceramic such as C1020.

  Next, as shown in FIG. 13C, the welding tool 33 (stirring pin 31) that rotates on the weld bead portion 4 is moved along the axis of the abutting portion 3 (perpendicular to the surfaces of the first and second aluminum members 1 and 2). ) And friction stir the weld bead portion 4 and its surroundings.

  Since the weld bead portion 4 is once melted and solidified, it becomes a cast structure, but the cast structure is modified by friction stirring, and a reformed portion (friction stirring portion) 5 is formed as shown in FIG. The In this case, the reforming part 5 is formed leaving the weld bead part 4 in the plate thickness direction. Since the cast structure is brittle, it is easy to break when a tensile load or bending load is applied to this part. However, by providing the metal structure reforming part 5 by friction stirring, the structure is refined and bonded to the cast structure. Strength can be improved.

  In this embodiment, it is not necessary to insert the stirring pin 31 deeply in the thickness direction. Thereby, the load concerning the stirring pin 31 can be reduced and the joining speed can be increased.

  In particular, since a member to be joined such as an automobile frame member is thick, in the case of normal friction stir welding, it takes a very long time. However, with the manufacturing method of this embodiment, the member to be joined is joined at a high joining speed. be able to.

  On the other hand, as in this embodiment, melt welding (penetration welding) is once performed to form a solidified weld bead portion 4, and then the weld bead portion 4 is modified by friction stir to generate kissing bonds. Disappears. Furthermore, management of the stirring pin 31 and setting of the insertion depth are simplified.

  Further, even if the weld bead portion 4 has unevenness or shrinkage, the unevenness or shrinkage is eliminated by the flow of the joint due to stirring.

As described above, according to the method for manufacturing an aluminum structural member in which the first aluminum member 1 and the second aluminum member 2 are joined, the first and second aluminum members 1 and 2 are placed on the backing member 40. The first and second aluminum members 1 and 2 are butted together in a state of being disposed on the surface of the first aluminum member 1 and the surface of the second aluminum member 2 to form a flat butted portion 3; Irradiating a laser beam from the surface side of the first and second aluminum members 1 and 2 toward the part 3 to weld the butt part 3 and forming a weld bead part 4 continuous from the surface of the butt part 3 to the back surface; And a step of stirring the weld bead portion 4 from the surface side by the rotating joining tool 33. As a result, it is possible to provide a method for producing an aluminum structural member that has a high joining speed and is excellent in the quality / appearance and joining strength of the joint.
Other configurations and operations are the same as those of the first or second embodiment.

  Also in the present embodiment, it is preferable to perform welding while supplying the filler material 23 from the filler material supply nozzle 22 as necessary during laser welding (see FIG. 12).

Further, the friction agitation is not limited to that performed on the laser beam X irradiation side (front surface side) as in this embodiment, but from both the front surface side and the opposite side (back surface side) of the front surface side. You can do it. That is, as in the modification shown in FIG. 15C, the modified portion 5 may be formed on both the front surface side and the back surface side.
In this case, as in the above embodiment, as shown in FIG. 13C, after the weld bead portion 4 is frictionally stirred from the surface side of the first and second aluminum members 1 and 2, the first and second aluminum members 2 are The first and second aluminum members 1, 2 removed from the backing member 40 and joined are turned upside down and placed on the surface plate 11 as shown in FIG. 15A. Then, as shown in FIG. 15B, the weld bead portion 4 is also stirred and reformed while the stepped portion on the back surface is caused to flow by friction stir welding.

  At that time, the axis L of the joining tool 33 is inclined at an angle θ from the direction perpendicular to the back surfaces of the first aluminum member 1 and the second aluminum member 2 (upper surface in FIG. 15B) to the first aluminum member 1 side. The first aluminum member 1 and the second aluminum member 2 are pressed against the stepped portion. Note that the inclination angle θ of the welding tool 33 is set according to the plate thickness difference between the first and second aluminum members 1 and 2, for example, within a range of 30 ° or less with respect to the perpendicular direction. Tilt to set.

  Simultaneously with stirring by the rotating joining tool 33, a shape that smoothly connects the first aluminum member 1 and the second aluminum member 2 without a step is formed by the shoulder 32 of the joining tool 33. As shown in FIG. Friction stirring portion) 5 is formed. This processing eliminates the unevenness causing the strength reduction on the surface of the joint portion, and the joint strength is further increased.

  The friction stirrer is not limited as long as the stepped portion on the opposite surface (corresponding to the back surface) is processed into a smooth shape such as a tapered shape. For example, it may be processed into a smooth shape by a tapered step roll disclosed in Patent Document 6.

  Also in the third embodiment, as the joining tool 33, those exemplified in FIGS. 11A to 11C described in the second embodiment can be used as appropriate, and each joining tool 33 is described in the second embodiment. Has the same effect as

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

For example, in the above embodiment, the weld bead portion 4 is formed by laser welding, but the present invention may form the weld bead portion 4 by MIG welding. Accordingly, the welding heat source when forming the weld bead portion 4 may be the laser head 21 of laser welding or the welding torch of MIG welding.
However, in each embodiment, when the weld bead portion 4 is formed by MIG welding, the arrangement of the welding torch is the same as the side on which the laser head 21 for laser welding is arranged.
That is, in 2nd Embodiment, the welding torch which is a welding heat source is arrange | positioned at the surface side with a level | step difference. Moreover, in 3rd Embodiment, the welding torch which is a welding heat source is arrange | positioned at the surface side of the 1st and 2nd aluminum member which forms a flat butt | matching part.

  Moreover, the manufacturing method of the aluminum structural member formed by joining the first aluminum member and the second aluminum member having different plate thicknesses is not limited to those of the second and third embodiments. That is, in the manufacturing method in the case of using the first and second aluminum members having different plate thicknesses, the step of abutting the first and second aluminum members with each other to form a butt portion, welding the butt portion, and the surface of the butt portion What is necessary is just to include the process of forming the weld bead part which continues to the back surface from and the process of stirring the weld bead part with the rotating joining tool.

(Test 1)
First, in Test 1, the following test was performed in order to confirm the effect of the manufacturing method according to the first embodiment of the present invention.
As shown in Table 1, AA6022-T4 equivalent material (Examples 1 to 3, 5, 6, Comparative Examples 1, 3, and 4) having a thickness of 3.0 mm and a thickness of 3.0 mm were used for the test. JIS A7075-T6 (Example 4, Comparative Example 2). The size of the test piece was 150 mm × 300 mm, and 300 mm end portions were butted together and joined. The joining length is 280 mm.

Next, the case where the laser apparatus 20 is used for welding will be described. The laser used was YLS-6000 made by IPG Photonics, the head and processing machine were custom-made, and the condenser lens was welded with a focal length of 450 mm and a condenser diameter of 0.3 mm.
On the other hand, in the case of MIG welding, the welding power source was WB-P350 manufactured by Daihen.
The friction stirrer 30 is a custom-made processing machine, and the joining tool 33 is a normal type having a stirrer pin 31 as shown in FIG. 11C and made of an SKD61 equivalent material. When the stirring depth is 1 mm, the welding tool 33 has a shoulder diameter of 11 mm, a probe diameter (pin diameter) of φ4 mm, and a height of 0.9 mm. When the stirring depth is 2 mm, the welding tool 33 has a shoulder diameter of 13 mm and a probe diameter (pin). A diameter of φ5 mm and a height of 1.8 mm was used.

In Example 5, the joining tool 33 having a shoulder diameter of 11 mm (no pin) was used when the stirring depth was 0.5 mm.
Furthermore, in Example 6, the joining tool 33 having a shoulder diameter of about 12 to 13 mm, a probe diameter (pin diameter) of 4 mm, and a height of 1.5 mm was used.

  The construction conditions for laser welding in Examples 1 to 4 are a laser output of 5500 W and a welding speed of 200 cm / min, a filler material of JIS A5356WY φ1.2 mm, and a supply speed of 200 cm / min. Friction stirring was processed at the same speed as laser welding at a rotational speed of 2000 rpm and 50 mm away from the laser irradiation position. The construction conditions of Example 5 were the same as those of Examples 1 to 5 except that the welding speed was 240 cm / min.

  The construction conditions of MIG welding in Example 6 were a DC pulse method, a current of 120 A, a voltage of 18 V, a welding speed of 150 cm / min, and a forward angle of the welding torch of 10 °. Further, argon gas was used at 25 L / min as the shielding gas, and JIS A5356-WY having a diameter of 1.2 mm was used as the filler material. Moreover, in Example 6, friction stirring was performed at the same speed as MIG welding.

  Further, in Examples 1, 4 and 6, as in the above embodiment, the friction stir was performed only from the side irradiated with the laser beam X, and a joint as shown in FIG. 2D was obtained. In Example 2, as in the first modified example, the friction stir was performed only from the side (front side) irradiated with the laser beam X (on the back side) to obtain a joint as shown in FIG. 4A. In Example 3, as in the second modified example, the friction stir was performed from both sides (surface side, back side) in the plate thickness direction, and a joint as shown in FIG. 4B was obtained. In Example 5, as in the third modified example, joining was performed only with the shoulder 32 of the joining tool 33, and a joined portion as shown in FIG. 6B was obtained.

  Further, in the case of only the laser of Comparative Example 3, the laser output was 5500 W, the welding speed was 400 cm / min, the filler material was JIS A5356WY φ1.2 mm, and the supply speed was 400 cm / min.

  In the case of only the friction stir welding in Comparative Examples 1 and 2, the shoulder diameter was 14 mm, the probe was M5, and a tool made of SKD61 equivalent material with a height of 2.7 mm was used. The rotation speed was 2200 rpm and the welding speed was 50 cm / min. It joined with.

Furthermore, in the case of the laser assisted friction stir welding of Comparative Example 4, the method of performing the friction stir welding simultaneously with the laser preceding, the joining speed is 150 cm / min, the interval is 10 mm, the laser has a laser output of 2000 W, and the friction stir welding is Shoulder diameter 14mm, probe M5, height 2.
The rotation speed was set to 2200 rpm using a tool made of 7 mm SKD61 equivalent material.

  In the case of only MIG welding of Comparative Example 5, the direct current pulse method is used, the current is 120 A, the voltage is 18 V, the welding speed is 150 cm / min, the advance angle of the welding torch is 10 °, and the argon gas is used as the shielding gas at 25 L / min. As a filler material, JIS A5356-WY having a diameter of 1.2 mm was used.

  The joined joints were cut in a direction perpendicular to the joining line, and 6 strips having a width of 3 mm and 3 strips having a width of 40 mm were collected. A strip with a width of 25 mm was subjected to a tensile test, and a strip with a width of 40 mm was subjected to a back bending test.

The tensile test was a tensile test (n = 3) in which the test piece was pulled in the length direction. For the elongation, the elongation between chucks was measured, and the average of the three measurement results was used as the evaluation result.
The back bending test was a mold bending test according to the procedure of (JIS Z 3122: 2013). The radius R of the male shoulder was 2t = 6 mm. In each case, a back bending test was conducted.

  In the tensile test, ◎ is excellent, ○ is equivalent, Δ is slightly inferior, and X is considerably inferior in comparison with the elongation of the joint of friction stir welding with the same material combination. In the back bending test, the appearance of the joint portion was evaluated, and ○ was good, Δ was small cracks, and x was cracks over the entire width. The overall evaluation is that S is excellent, A is good, B is slightly inferior, and C is inferior.

  As shown in Table 1, it can be seen that good results were obtained in Examples 1 to 6 which are within the scope of the present invention. On the other hand, in the friction stir welding that is Comparative Examples 1, 2, and 4, cracks occurred in the kissing bond portion 6 in the back bending test. Moreover, in the laser welding of the comparative example 3 and the MIG welding of the comparative example 5, it became a low evaluation compared with Examples 1-6 and Comparative Examples 1, 2, and 4 in the tension test.

(Test 2)
Next, in Test 2, the following test was performed in order to confirm the effect of the manufacturing method according to the second embodiment of the present invention. As shown in Table 2, the test piece is an AA6022-T4 equivalent material (Examples 7 to 10, Comparative Examples 6 to 8) having a thickness of 3.0 mm and a thickness of 1.5 mm. The size of the test piece was 150 mm × 300 mm, and 300 mm end portions were butted together and joined. The joining length is 280 mm.

  The laser device 20, MIG welder, and friction stirrer 30 used for welding are the same as those used in Test 1.

  As the joining tool 33 of Examples 7 and 9, a tool having a convex shoulder 32 having a shoulder diameter of 11 mm and a stirring pin 31 having a probe diameter (pin diameter) of 4 mm as shown in FIG. 11A was used. . On the other hand, in Example 8, the joining tool 33 having a convex shoulder 32 with a shoulder diameter of 11 mm and having no stirring pin 31 as shown in FIG. 11B was used.

  As the welding conditions of Examples 7 to 9, laser welding was performed at a laser output of 5500 W and a welding speed of 200 cm / min, the filler material was JIS A5554WY, φ1.2 mm, and the supply speed was 200 cm / min. Friction stirring was performed at the same speed as the laser welding at a location where the rotation speed was 2000 rpm and 50 mm away from the laser irradiation position. The construction conditions of Example 8 were the same as those of Examples 7 and 9 except that the welding speed was 240 cm / min.

  The construction conditions for MIG welding in Example 10 were a DC pulse method, a current of 120 A, a voltage of 18 V, a welding speed of 150 cm / min, and a forward angle of the welding torch of 10 °. Further, argon gas was used at 25 L / min as the shielding gas, and JIS A5356-WY having a diameter of 1.2 mm was used as the filler material. Moreover, in Example 10, friction stirring was performed at the same speed as MIG welding.

  In Examples 7, 8 and 10, the friction stir was performed only from the side irradiated with the laser beam X as in the above embodiment, and a joint as shown in FIG. 8D was obtained. In Example 9, as in the modification shown in FIG. 9, friction agitation was performed from both the side irradiated with the laser beam X (front side) and the opposite side (back side).

  Further, in the case of only the friction stir welding in Comparative Example 6, the shoulder diameter is 14 mm, the probe (stirring pin) is M5, and a welding tool made of SKD61 equivalent material with a height of 2.7 mm is used. Joining was performed at 80 cm / min.

  In the case of only the laser of Comparative Example 7, the laser output was 5500 W, the welding speed was 400 cm / min, the filler material was JIS A5554WY, φ1.2 mm, and the supply speed was 400 cm / min.

  In the case of only MIG welding of Comparative Example 8, the DC pulse method is used, the current is 120 A, the voltage is 18 V, the welding speed is 150 cm / min, the advance angle of the welding torch is 10 °, and the argon gas is used as a shielding gas at 25 L / min. As a filler material, JIS A5356-WY having a diameter of 1.2 mm was used.

  The evaluation methods for tensile strength, appearance evaluation, and comprehensive evaluation are the same as in Test 1.

  As shown in Table 2, it can be seen that good results were obtained in Examples 7 to 10, which are within the scope of the present invention. On the other hand, in Comparative Example 6, since the joining was performed only by friction stir welding, the appearance of the joined portion was inferior, and the tensile strength was inferior because a kissing bond portion was formed.

  Further, in the laser welding of Comparative Example 7, the tensile test was slightly inferior, and some unevenness was observed in the joint portion, so the evaluation was lower than that of Examples 7-10. In the MIG welding of Comparative Example 8, both the tensile test and the back bending test were evaluated lower than Examples 7-10.

(Test 3)
Next, in Test 3, the following test was performed in order to confirm the effect of the manufacturing method according to the third embodiment of the present invention. As shown in Table 3, the test piece is an AA6022-T4 equivalent material (Examples 11 to 14, Comparative Examples 9 to 11) having a thickness of 3.0 mm and a thickness of 1.5 mm. The size of the test piece was 150 mm × 300 mm, and 300 mm end portions were butted together and joined. The joining length is 280 mm.

  The laser device 20, MIG welder, and friction stirrer 30 used for welding are the same as those used in Test 1.

  The joining tool 33 of Examples 11, 13, and 14 has a convex shoulder 32 with a shoulder diameter of 11 mm and a stirring pin 31 with a probe diameter (pin diameter) of 4 mm as shown in FIG. 11A. Using. On the other hand, in Example 12, the joining tool 33 has a convex shoulder 32 with a shoulder diameter of 11 mm and no stirring pin 31 as shown in FIG. 11B.

  As the construction conditions of Examples 11 and 13, laser welding was performed at a laser output of 5500 W and a welding speed of 200 cm / min, the filler material was JIS A5554WY, φ1.2 mm, and the supply speed was 200 cm / min. Friction stirring was performed at the same speed as the laser welding at a location where the rotation speed was 2000 rpm and 50 mm away from the laser irradiation position. The construction conditions of Example 12 were the same as those of Examples 11 and 13 except that the welding speed was 240 cm / min.

  The construction conditions for MIG welding in Example 14 were a DC pulse method, a current of 120 A, a voltage of 18 V, a welding speed of 150 cm / min, and a forward angle of the welding torch of 10 °. Further, argon gas was used at 25 L / min as the shielding gas, and JIS A5356-WY having a diameter of 1.2 mm was used as the filler material. Moreover, in Example 14, friction stirring was performed at the same speed as MIG welding.

  Further, in Examples 11, 12, and 14, as in the above embodiment, the friction stir was performed only from the side irradiated with the laser beam X to obtain a joint as shown in FIG. In Example 13, as in the modification shown in FIG. 15C, the friction stir was performed from both the side irradiated with the laser beam X (front side) and the opposite side (back side).

  Moreover, in the case of only the friction stir welding of Comparative Example 9, the shoulder diameter is 14 mm, the probe (stirring pin) is M5, and a joining tool made of SKD61 equivalent material with a height of 2.7 mm is used. Bonding was performed at 50 cm / min.

  In the case of only the laser of Comparative Example 10, the laser output was 5500 W, the welding speed was 400 cm / min, the filler material was JIS A5554WY, φ1.2 mm, and the supply speed was 400 cm / min.

  In the case of only MIG welding of Comparative Example 11, a DC pulse method is used, a current of 120 A, a voltage of 18 V, a welding speed of 150 cm / min, a welding torch advance angle of 10 °, and argon gas as a shielding gas at 25 L / min. As a filler material, JIS A5356-WY having a diameter of 1.2 mm was used.

  The evaluation methods for tensile strength, appearance evaluation, and comprehensive evaluation are the same as in Test 1.

  As shown in Table 3, it can be seen that good results were obtained in Examples 11 to 14 within the scope of the present invention. On the other hand, in Comparative Example 9, since the joining was performed only by friction stir welding, the appearance of the joined portion was inferior, and the tensile strength was inferior because a kissing bond portion was formed.

  Moreover, in the laser welding of Comparative Example 10, the tensile test was slightly inferior, and some unevenness was observed at the joint, so the evaluation was lower than in Examples 11-14. In the MIG welding of Comparative Example 11, both the tensile test and the back bending test were evaluated lower than Examples 11-14.

DESCRIPTION OF SYMBOLS 1 1st aluminum member 2 2nd aluminum member 3 Butting | matching part 4 Weld bead part 5 Reforming part 10 Manufacturing apparatus 11 Surface plate 20 Laser apparatus 21 Laser head 30 Friction stirrer 31 Stirring pin 32 Shoulder 33 Joining tool 40 Backing member

Claims (14)

A method for producing an aluminum structural member in which a first aluminum member and a second aluminum member are joined,
Abutting the first and second aluminum members together to form a butted portion;
Welding the butt portion and forming a weld bead portion continuous from the front surface to the back surface of the butt portion; and
A step of stirring the weld bead by welding tool rotating, only including,
The said stirring process is a manufacturing method of the aluminum structural member performed in the state of the high temperature from the solidus temperature of the aluminum alloy in the said weld bead part to 100 degreeC .   The method for manufacturing an aluminum structural member according to claim 1, wherein the stirring step forms a friction stirring portion while leaving the weld bead portion in a plate thickness direction.   The joining tool has a shoulder and an agitating pin disposed at the tip of the shoulder, and the agitating step inserts the agitating pin of the joining tool into the weld bead, and the shoulder and the agitating pin The method for producing an aluminum structural member according to claim 1, wherein the weld bead portion is agitated.   The method for manufacturing an aluminum structural member according to claim 3, wherein the stirring pin is inserted into the weld bead portion from any one side in the plate thickness direction of the first and second aluminum members.   The method for manufacturing an aluminum structural member according to claim 3, wherein the stirring pin is inserted into the weld bead portion from both sides in the plate thickness direction of the first and second aluminum members. A method for producing an aluminum structural member formed by joining a first aluminum member and a second aluminum member having different plate thicknesses,
Abutting the first and second aluminum members together to form a butted portion;
Welding the butt portion and forming a weld bead portion continuous from the front surface to the back surface of the butt portion; and
A step of stirring the weld bead by welding tool rotating, only including,
The said stirring process is a manufacturing method of the aluminum structural member performed in the state of the high temperature from the solidus temperature of the aluminum alloy in the said weld bead part to 100 degreeC . A method for producing an aluminum structural member, wherein a first aluminum member and a second aluminum member thicker than the first aluminum member are butt-joined,
Abutting the first and second aluminum members together to form a stepped butted portion;
When the stepped side is the surface, a step of arranging a welding heat source on the surface side, welding the butt portion, and forming a weld bead portion continuous from the surface of the butt portion to the back surface; and
Agitating the weld bead portion with a rotating joining tool,
The stirring step is performed in a high temperature state from the solidus temperature of the aluminum alloy in the weld bead portion to 100 ° C,
The manufacturing method of the aluminum structural member which inclines the axial center of the said joining tool in the said stirring process to the said 1st aluminum member side with respect to the direction perpendicular | vertical to the said surface of the said 1st and 2nd aluminum member. A method for producing an aluminum structural member, wherein a first aluminum member and a second aluminum member thicker than the first aluminum member are butt-joined,
In a state where at least the first aluminum member is disposed on the backing member, the first and second aluminum members are butted so that the surface of the first aluminum member and the surface of the second aluminum member are flat. Forming a butt portion; and
Arranging a welding heat source on the surface side of the first and second aluminum members, welding the butt portion, and forming a weld bead portion continuous from the surface of the butt portion to the back surface; and
The welding tool which rotates the step of stirring the weld bead portion from the front side, only including,
The said stirring process is a manufacturing method of the aluminum structural member performed in the state of the high temperature from the solidus temperature of the aluminum alloy in the said weld bead part to 100 degreeC . Removing the backing member from the first and second aluminum members in which the weld bead portion is stirred;
A step of agitating the weld bead portion from the back side with the rotating joining tool,
9. The stirring step from the back surface side, wherein the axis of the joining tool is inclined toward the first aluminum member side with respect to a direction perpendicular to the back surfaces of the first and second aluminum members. A method for producing an aluminum structural member.   The said weld bead part is a manufacturing method of the aluminum structural member of any one of Claims 1-9 formed by laser welding.   The method for manufacturing an aluminum structural member according to claim 10, wherein in the step of forming the weld bead portion, the laser beam is irradiated while supplying a filler material.   The method for producing an aluminum structural member according to any one of claims 1 to 9, wherein a shoulder of the joining tool has a convex shape.   The method for manufacturing an aluminum structural member according to claim 10, wherein a shoulder of the joining tool has a convex shape.   The method for manufacturing an aluminum structural member according to claim 11, wherein a shoulder of the joining tool has a convex shape.

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