JP7264768B2 - Joined structure manufacturing method and joined structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a bonded structure and a bonded structure.

As a technique for joining dissimilar materials, there is known a technique for joining a first member to be joined made of resin and a second member to be joined made of metal with a rivet (see, for example, Patent Document 1). In this joining technique, a rivet is driven from the back side of a recess formed on the joining side, the first member to be joined is placed on the second member to be joined, and the rivet is welded to the second member to be joined. Thereby, the first member to be joined and the second member to be joined are joined by the rivet.

Alternatively, the first plate made of aluminum alloy or magnesium alloy with a hole is superimposed on the second plate made of steel, the steel joining auxiliary member is inserted into the hole, and the laser beam is formed in the joining auxiliary member. There is a technique for bonding a bonding auxiliary member to a second plate by irradiating the concave portion (see, for example, Patent Document 2).

Furthermore, a joining technique is also known in which a steel material and a light alloy material are joined together by spot-welding a long steel rivet that penetrates the light alloy material to the steel material (see, for example, Patent Document 3).

JP 2017-26079 A JP-A-2018-51570 JP 2019-7623 A

By the way, it has been considered to join a resin material to an extruded aluminum material, which is highly versatile as a structural material for vehicles and the like, by a method other than adhesion. In addition, as a joining method for joining a joining member such as a plate made of a different material to an extruded aluminum member, a single-sided access that does not require entry of a tool from the pressing member side is a condition, so rivets are used from the joining member side. There is a mechanical joining method such as a flow drilling screw (FDS (registered trademark): Flow Drilling Screw) method for joining by screwing.

However, this mechanical joining method takes a long time for the joining operation, resulting in high manufacturing cost, and furthermore, it is difficult to directly join the extruded material and the resin material. In the technique described in Patent Literature 1, the resin-made first member to be joined has a protrusion for forming a recess, and a gap is generated between the first member to be joined and the second member to be joined.

The present invention has been made in view of the above problems, and an object of the present invention is to enable a member made of a resin material to be easily joined to an extruded member made of an aluminum-based material or a magnesium-based material in a short time. Another object of the present invention is to provide a method for manufacturing a joint structure and a joint structure that can significantly reduce the manufacturing cost.

The present invention consists of the following configurations.
(1) stacking a second member made of a resin material on a first member made of an extruded material of an aluminum-based material or a magnesium-based material;
joining the first member and the second member by laser-welding an elongated element made of the same material as that of the first member to the first member from the second member side;
A method of manufacturing a joined structure, comprising:
(2) a first member made of extruded aluminum-based material or magnesium-based material;
a second member made of a resin material overlaid on the first member;
It is made of the same material as the first member, is fitted into a fitting hole formed in the second member, and is laser-welded to the first member so that the second member is sandwiched between the first member and the second member. an elongate element joining said second member to said first member;
A junction structure having a

According to the method for manufacturing a joined structure and the joined structure of the present invention, a member made of a resin material can be easily joined to an extruded member made of an aluminum-based material or a magnesium-based material in a short time. Costs can be significantly reduced.

1 is a perspective view of a joint structure according to a first embodiment of the present invention; FIG. Fig. 2 is a perspective view of an elongated element; FIG. 10 is a perspective view, an AA cross-sectional view, and a BB cross-sectional view showing the elongated element assembled to the second member; It is a perspective view of the 2nd member and elongate element explaining the manufacturing method of a joined structure. FIG. 3 is a perspective view of a joined structure in the middle of production for explaining a method of producing a joined structure; FIG. 5 is a perspective view of a joint structure according to a second embodiment of the present invention; FIG. 7 is a cross-sectional view taken along line CC in FIG. 6; It is a perspective view of the 2nd member and elongate element explaining the manufacturing method of a joined structure. FIG. 3 is a perspective view of a joined structure in the middle of production for explaining a method of producing a joined structure; FIG. 10 is a perspective view of an elongated element according to Modification 1; FIG. 10 is a perspective view, a DD cross-sectional view, and an EE cross-sectional view showing the elongated element according to Modification 1 assembled to the second member; FIG. 11 is a perspective view of an elongated element according to modification 2; FIG. 10 is a perspective view, a FF cross-sectional view, and a GG cross-sectional view showing the elongated element according to Modification 2 assembled to the second member. FIG. 11 is a perspective view of an elongated element according to modification 3; FIG. 10 is a perspective view, a HH cross-sectional view, and an II cross-sectional view showing the elongated element according to Modification 3 assembled to the second member. FIG. 2 is a perspective view showing a cross-section of a part of the battery case configured by the joint structure;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
First, the first embodiment will be described.
1 is a perspective view of a joint structure according to a first embodiment of the present invention; FIG.

As shown in FIG. 1, the joined structure 100 according to the first embodiment has a first member 10, a second member 20, and an elongated element 30. As shown in FIG.

The first member 10 is an extruded material of an aluminum-based material or a magnesium-based material. In this example, as the first member 10, an extruded material of an aluminum-based material is used. The first member 10 has a bottom wall portion 11 , a pair of side wall portions 12 and an upper wall portion 13 . Thereby, the first member 10 is formed in a hollow shape having a rectangular cross-sectional view and a hollow portion 15 . The joint structure 100 has two first members 10, and these first members 10 are arranged in parallel in the longitudinal direction, which is the extrusion direction.

The second member 20 is not particularly limited, and resins having no polar functional groups such as polypropylene, polyamides, etc., such as hydroxyl groups (OH groups), carboxyl groups (COOH groups), amino groups ( _NH2 groups), etc. It is made of a resin material having a polar functional group of , and is formed in a flat plate shape. The second member 20 is overlaid on the first member 10 arranged in parallel. Thereby, the second member 20 is bridged over the first member 10 .

The elongated element 30 is an elongated member made of the same material as the first member 10 . In this example, as the long element 30, a long member made of the same kind of aluminum-based material as the first member 10 is used. Examples of aluminum-based materials include aluminum materials such as pure aluminum-based materials and aluminum alloy-based materials. As the aluminum alloy, 4000 series (AL--Si series), 5000 series (Al--Mg series) and the like are preferably used from the viewpoint of preventing cracks in welded portions.

The elongated element 30 is produced, for example, by pressing or forging. The elongated element 30 may also be produced by extrusion molding. The joint structure 100 includes two elongated elements 30 , which are aligned in the longitudinal direction and arranged in parallel on the upper surface side of the second member 20 . The elongated elements 30 arranged on the upper surface of the second member 20 are arranged above the first member 10 with the second member 20 interposed therebetween.

FIG. 2 is a perspective view of an elongated element; FIG. 3 is a perspective view, an AA sectional view, and a BB sectional view showing the elongated element assembled to the second member.

As shown in FIGS. 2 and 3, the elongated element 30 includes an element main body 31 formed in a plate shape, a ridge portion 32 protruding from one surface of the element main body 31 along the longitudinal direction, have. The element body 31 has a flange portion 33 that protrudes outward in the width direction from the ridge portion 32 . The second member 20 is formed with a fitting hole 21 penetrating from the front to the back at the place where the first member 10 is overlapped. The long element 30 is assembled to the second member 20 by fitting the protrusion 32 into the fitting hole 21 with the protrusion 32 directed toward the second member 20 . The elongated element 30 has a width W of 5 mm or more, a length L of 15 mm or more, and a ratio L/W between the width W and the length L of 3 or more and 100 or less.

The elongated element 30 arranged above the first member 10 via the second member 20 is laser-welded to the first member 10 . Specifically, the elongated element 30 is laser-welded to the first member 10 along the longitudinal direction at the central portion in the width direction of the element body 31 . At the welded portion 35 having the laser-welded bead, the ridge portion 32 of the elongated element 30 and the upper wall portion 13 of the first member 10 are welded and fixed. The second member 20 is joined to the first member 10 with the edge of the fitting hole 21 locked by the flange portion 33 of the elongated element 30 laser-welded to the first member 10 .

Next, a manufacturing method for manufacturing the bonded structure 100 having the above structure will be described.
FIG. 4 is a perspective view of the second member and elongated elements for explaining the method of manufacturing the joined structure. FIG. 5 is a perspective view of a joined structure in the middle of production for explaining a method of producing the joined structure.

First, as shown in FIG. 4, the protrusion 32 of the long element 30 is fitted into the fitting hole 21 previously formed in the second member 20 from above. This causes the second member 20 to hold the elongated element 30 .

Next, as shown in FIG. 5, the second member 20 is overlaid and bridged over the first member 10 made of extruded material arranged in parallel. At this time, the elongated element 30 held by fitting the protrusion 32 in the fitting hole 21 of the second member 20 is arranged above the upper wall portion 13 of the first member 10 .

After that, the central portion of the elongated element 30 in the width direction is irradiated with the laser beam Ln for laser welding from one end to the other end. Then, the elongated element 30 is fixed by laser welding to the upper wall portion 13 of the first member 10 at the central protrusion 32 in the width direction, and the fitting hole 21 of the second member 20 is fixed. The edge is locked by the flange 33 of the elongated element 30 . Thereby, the joined structure 100 in which the first member 10 and the second member 20 are joined by the elongated element 30 is obtained. The bead shape of the welded portion 35 formed by laser-welding the long element 30 to the first member 10 is preferably a wave shape or a wobbling shape rather than a straight line from the viewpoint of preventing cracks and blowholes in the welded portion. be.

As described above, according to the method for manufacturing the joined structure 100 and the joined structure 100 according to the first embodiment, the extruded material of an aluminum-based material or a magnesium-based material, which is difficult to join by a mechanical joining method, is used. It is possible to easily join the first member 10 and the second member 20 made of a resin material. Moreover, since the extruded material is used as the first member 10 that joins the second member 20, the versatility is high and the cost can be reduced as compared with the case of using a dedicated product.

Further, by laser-welding the elongated element 30 to the first member 10 from the second member 20 side, the second member 20 can be joined to the first member 10 in a short time. The influence of heat on the member 20 can be suppressed as much as possible, and both initial costs and running costs can be suppressed. Thereby, a high-quality joined structure 100 can be manufactured at low cost.

By the way, if the width W of the elongated element 30 laser-welded to the first member 10 is less than 5 mm, burn-through and cracking of the welded portion are likely to occur during laser welding. Also, if the length L of the long element 30 is less than 15 mm, the laser welding to the first member 10 becomes unstable.

In this embodiment, as the long element 30, an element having a width W of 5 mm or more, a length L of 15 mm or more, and a ratio L/W between the width W and the length L of 3 or more and 100 or less is used. Therefore, the long element 30 can be strongly and stably laser-welded to the first member 10 without problems such as burn-through. can be joined.

(Second embodiment)
Next, a second embodiment will be described.
In addition, the same components as those of the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.
FIG. 6 is a perspective view of a joint structure according to a second embodiment of the invention. 7 is a cross-sectional view taken along line CC in FIG. 6. FIG.

As shown in FIGS. 6 and 7, in the joined structure 200 according to the second embodiment, the second member 20 joined to the first member 10 and the long element 30 are laser-welded. Specifically, the upper surface of the second member 20 and the flange portions 33 on both sides of the elongated element 30 have welded portions 37 laser-welded along the longitudinal direction of the elongated element 30 . At this welded portion 37, the surface of the flange portion 33 of the elongated element 30 and the surface of the second member 20 are joined. Specifically, in the welded portion 37, the oxide film (alumina: Al ₂ O ₃ ) on the surface of the flange portion 33 of the long element 30 made of an aluminum-based material, the OH group of the second member 20, the CO
Polar functional groups such as OH groups or _NH2 groups are chemically bonded by the heat of the laser. Thereby, in the joint structure 200 , the sealing performance between the elongated element 30 and the second member 20 is ensured at the welded portion 37 .

Next, a method for manufacturing this joint structure 200 will be described.
FIG. 8 is a perspective view of the second member and elongated elements for explaining the method of manufacturing the joined structure. FIG. 9 is a perspective view of a joined structure in the middle of production for explaining a method of producing the joined structure.

First, the elongated element 30 is held by the second member 20 by fitting the projection 32 of the elongated element 30 from above into the fitting hole 21 formed in advance in the second member 20 (see FIG. 4).

Next, as shown in FIG. 8, the long element 30 is irradiated with a wide laser beam Lw. This laser beam Lw is a wide laser beam whose intensity is lower than that of the laser beam Ln used for welding, for example, by adjusting the focal position and intensity. Then, the laser light Lw is applied to the entire width direction of the long element 30 from one end to the other end. In this way, when the long element 30 is irradiated with the laser light Lw, the upper surface of the second member 20 and the flange portions 33 on both sides of the long element 30 are chemically heated by the heat of the laser along the longitudinal direction of the long element 30. and a welded portion 37 is formed.

After the elongated element 30 is laser welded to the second member 20, as shown in FIG. The second member 20 is laid over the wall portion 13 so as to be arranged above the wall portion 13 .

After that, the central portion in the width direction of the elongated element 30 is irradiated with laser light Ln from one end to the other end. Then, the elongated element 30 is fixed by laser welding to the upper wall portion 13 of the first member 10 at the central protrusion 32 in the width direction, and the fitting hole 21 of the second member 20 is fixed. The edge is locked by the flange 33 of the elongated element 30 . Thereby, a joined structure 200 in which the first member 10 and the second member 20 are joined by the elongated element 30 is obtained.

As described above, according to the manufacturing method of the joined structure 200 and the joined structure 200 according to the second embodiment, in addition to the first embodiment, the long element 30 and the second member 20 are laser-welded. This makes it possible to easily ensure the sealing performance between the long element 30 and the second member 20 without using a separate member such as a sealing member. In addition, since the elongated element 30 is welded to the second member 20, it is possible to obtain good handling properties when the second member 20 is stacked on the first member 10. FIG.

Further, since a member made of a resin material having a polar functional group such as an OH group, a COOH group, or an _NH2 group is used as the second member 20, the long element 30 and the second member 20 are separated by the heat of the laser light Lw. Good chemical bonding can be achieved to enhance sealing.

The step of irradiating the long element 30 with the laser beam Lw to laser-weld the long element 30 and the second member 20 includes irradiating the long element 30 with the laser beam Ln to make the long element 30 the first member. It may be performed after the step of laser welding to the member 10, or may be performed at the same time.

Next, various modifications of the elongated element 30 will be described.
(Modification 1)
10 is a perspective view of an elongated element according to Modification 1. FIG. 11A and 11B are a perspective view, a DD cross-sectional view, and an EE cross-sectional view showing the elongated element according to Modification 1 assembled to the second member.

As shown in FIGS. 10 and 11, in a long element 30A according to Modification 1, an element main body 31 protrudes both to the outside in the width direction and to the outside in the longitudinal direction with respect to a ridge portion 32 to form a flange portion 33. ing.

In this elongated element 30A, when the elongated element 30A is fitted into the fitting hole 21 of the second member 20, the flanges 33 on both sides and the flanges 33 on both ends lock the edges of the fitting hole 21. As shown in FIG. Thereby, when the long element 30A is laser-welded to the first member 10, the first member 10 and the second member 20 can be joined with higher joint strength. Further, when the elongated element 30A is laser-welded to the second member 20, both sides and both ends of the elongated element 30A can be welded to the second member 20 to ensure the sealing performance over the entire circumference.

(Modification 2)
12 is a perspective view of an elongated element according to Modification 2. FIG. 13A and 13B are a perspective view, a FF cross-sectional view, and a GG cross-sectional view showing the elongated element according to Modification 2 assembled to the second member.

As shown in FIGS. 12 and 13, the elongated element 30B according to Modification 2 has substantially the same thickness as the second member 20. As shown in FIGS. Moreover, when using this long element 30B, the stepped fitting hole 21 is formed in the second member 20 . Specifically, a countersunk hole portion 21 a having a size that allows the element body 31 to be fitted therein is formed in the fitting hole 21 on the side opposite to the joining side to the first member 10 .

In this elongated element 30B, when the projection 32 is fitted into the fitting hole 21 of the second member 20, the element main body 31 having the flange 33 fits into the countersunk hole 21a of the fitting hole 21. combined. As a result, the upper surface of the elongated element 30B is flush with the upper surface of the second member 20 . Therefore, the use of the elongated element 30B eliminates the protrusion from the upper surface of the second member 20, thereby obtaining a good appearance and eliminating interference with surrounding structures and members.

The thickness of the elongated element 30B is made thinner than that of the second member 20, and when the elongated element 30B is fitted into the fitting hole 21, the upper surface of the elongated element 30B is arranged at a position withdrawn from the upper surface of the second member 20. You may let

(Modification 3)
14 is a perspective view of an elongated element according to Modification 3. FIG. 15A and 15B are a perspective view, an HH cross-sectional view, and an II cross-sectional view showing the elongated element according to Modification 3 assembled to the second member.

As shown in FIGS. 14 and 15, the long element 30C according to Modification 3 has a tapered shape in which the ridge portion 32 is V-shaped in cross section.

In this elongated element 30</b>C, a load can be applied to the second member 20 to drive the ridge portion 32 . As a result, there is no need to form the fitting hole 21 of the second member 20 in advance, so that the manufacturing cost can be further reduced, and restrictions on the mounting position of the elongated element 30C with respect to the second member 20 can be eliminated. .

Next, application examples of the joint structure 100 (200) will be described.
FIG. 16 is a perspective view showing a cross section of a part of the battery case configured by the joint structure.

A battery case 300 containing a battery B is shown in FIG. This battery case 300 is mounted, for example, in a vehicle such as an electric vehicle or a hybrid vehicle. The battery case 300 is composed of a bottom plate portion 51 , a frame body 52 , a lid body 53 and a fixing member 54 . The frame 52 is fixed to the upper surface of the bottom plate portion 51 made of metal or resin. In the battery case 300, a space surrounded by the bottom plate portion 51, the frame body 52, and the lid body 53 serves as an accommodation space S, and the battery B is accommodated in the accommodation space S.

The battery case 300 is configured by assembling a joint structure 100 (200) to the upper surface of the bottom plate portion 51 . That is, the frame 52 made of the first member 10 is fixed to the upper surface of the bottom plate portion 51, and the fixed member 54 made of the elongated element 30 is laser-welded to the upper surface of the frame 52 to the frame 52. A lid 53 consisting of two members 20 is assembled.

As described above, according to the method of manufacturing a joined structure and the joined structure according to the present embodiment, the battery case 300 and the like can be easily configured at low cost. Further, by laser-welding the fixing member 54 consisting of the elongated element 30 to the lid body 53 consisting of the second member 20, it is possible to secure the sealing performance between the lid body 53 and the fixing member 54, and the waterproof property is excellent. A battery case 300 can be used. In addition, since the frame 52 is composed of the first member 10 made of extruded material, the impact resistance from the side can be enhanced.
Note that the bottom plate portion 51 may also be fixed to the frame body 52 by a fixing member 54 composed of the elongated element 30 .

As described above, the present invention is not limited to the above-described embodiments, and those skilled in the art can make modifications and applications by combining each configuration of the embodiments with each other, based on the description of the specification and well-known techniques. It is also contemplated by the present invention that it falls within the scope of protection sought.

For example, the types of laser beams Ln and Lw used in the above embodiment are not particularly limited, and various lasers such as YAG laser, _CO2 laser, fiber laser, disk laser, and semiconductor laser can be selected.

Hereinafter, while changing the material of the long element 30 and the welding conditions, the joint structure of the present invention was manufactured, and the presence or absence of cracks in the weld was confirmed.
Here, an A7N01-T6 material with a thickness of 3 mm was used as the first member 10 that serves as the lower plate. Moreover, as the second member 20 that becomes the upper plate, polypropylene having a thickness of 1 mm was used, and a fitting hole 21 of 5×80 mm was formed. The elongated elements 30 were made of A4032-T6 material and A5083-O material and had the shape shown in FIG. Therefore, as in the above embodiment, the projection 32 of the elongated element 30 is fitted into the fitting hole 21 of the second member 20, and the second member 20 with the element main body 31 positioned thereon is attached to the first member. Placed on top of 10.

The welding conditions are all shown in Table 1, and welding is performed by irradiating a laser beam from a galvano laser head toward the elongated element 30 . In addition, cross-sectional observation was performed on the joints thus produced, and the presence or absence of cracks was examined. The observation position was the central portion in the weld line direction. Table 2 shows the results.

As shown in Table 2, no cracks were observed in any of the samples for which the material of the long element 30 and the welding conditions were changed, confirming that sound welds can be formed.

As described above, this specification discloses the following matters.
(1) stacking a second member made of a resin material on a first member made of an extruded material of an aluminum-based material or a magnesium-based material;
joining the first member and the second member by laser-welding an elongated element made of the same material as that of the first member to the first member from the second member side;
A method of manufacturing a joined structure, comprising:
According to this configuration, it is possible to easily join the first member made of an extruded material of an aluminum-based material or a magnesium-based material and the second member made of a resin material, which is difficult to join by a mechanical joining method. Moreover, since the extruded material is used as the first member that joins the second member, the versatility is high and the cost can be reduced as compared with the case of using a dedicated product.
Further, by laser-welding the elongated element to the first member from the second member side, the second member can be joined to the first member in a short time. Influences can be suppressed as much as possible, and both initial costs and running costs can be suppressed. Thereby, a high-quality joint structure can be manufactured at low cost.

(2) The method for manufacturing a joined structure according to (1), further comprising the step of irradiating the elongated element with a laser beam to laser weld the elongated element and the second member.
According to this configuration, by laser welding the long element and the second member, it is possible to easily ensure the sealing performance between the long element and the second member without using a separate member such as a sealing member. . In addition, since the elongated element is welded to the second member, it is possible to obtain good handleability when stacking the second member on the first member.

(3) The method of manufacturing a joined structure according to (1) or (2), wherein a member made of a resin material having a polar functional group is used as the second member.
According to this configuration, the long element and the second member can be favorably chemically bonded by the heat of the laser, and the sealing performance can be improved.

(4) An element having a width W of 5 mm or more, a length L of 15 mm or more, and a ratio L/W between the width W and the length L of 3 or more and 100 or less is used as the long element. The method for manufacturing a joined structure according to any one of (1) to (3).
According to this configuration, the elongated element can be strongly and stably laser-welded to the first member without problems such as burn-through. can be joined.

(5) a first member made of extruded aluminum-based material or magnesium-based material;
a second member made of a resin material overlaid on the first member;
It is made of the same material as the first member, is fitted into a fitting hole formed in the second member, and is laser-welded to the first member so that the second member is sandwiched between the first member and the second member. an elongate element joining said second member to said first member;
A junction structure having a
According to this configuration, the first member made of an extruded material of an aluminum-based material or a magnesium-based material, which is difficult to join by a mechanical joining method, and the second member made of a resin material can be easily joined. Moreover, since the extruded material is used as the first member to which the second member is joined, the versatility is high and the cost can be reduced as compared with the case of using a dedicated product.
In addition, since it is possible to join the second member to the first member in a short time by laser-welding the elongated element to the first member from the second member side, the second member made of the resin material at the time of manufacturing can be used. Influence of heat to is suppressed as much as possible, and both initial cost and running cost are suppressed. As a result, a low-cost, high-quality joined structure can be obtained.

(6) The joined structure according to (5), wherein the elongated element and the second member are laser-welded.
According to this configuration, since the elongated element and the second member are laser-welded, it is possible to obtain a joint structure in which the sealing property between the elongated element and the second member is ensured. Therefore, a separate member such as a sealing member for sealing between the elongated element and the second member can be eliminated, and costs can be reduced.

(7) The joined structure according to (5) or (6), wherein the second member is made of a resin material having a polar functional group.
According to this configuration, the elongated element and the second member are favorably chemically bonded by the heat of the laser, so that the joined structure can have an improved sealing property.

(8) The long element has a width W of 5 mm or more, a length L of 15 mm or more, and a ratio L/W between the width W and the length L of 3 or more and 100 or less. The joined structure according to any one of (5) to (7).
According to this configuration, the long element is strongly and stably laser-welded to the first member without problems such as burn-through, and the second member is satisfactorily joined to the first member. can be

REFERENCE SIGNS LIST 10 first member 20 second member 30 long element 100, 200 joined structure Ln, Lw laser light L length of long element W width of long element

Claims (2)

A step of superimposing a second member made of a resin material having a polar functional group on a first member made of an extruded material of an aluminum-based material or a magnesium-based material;
causing the second member to hold an elongated element made of the same material as the first member;
a step of irradiating the long element with a wide laser beam to laser weld the long element to the upper surface of the second member;
A step of irradiating the elongated element with a laser beam and laser welding the elongated element to the upper surface of the first member;
including
The wide laser beam irradiated in the step of laser welding the long element to the upper surface of the second member is the laser beam irradiated in the step of laser welding the long element to the upper surface of the first member. is less intense than
A method of manufacturing a joint structure, characterized by: An element having a width W of 5 mm or more, a length L of 15 mm or more, and a ratio L/W between the width W and the length L of 3 or more and 100 or less is used as the long element. Item 2. A method for manufacturing a joined structure according to item 1 .

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