Method for manufacturing welded member

Abstract

The present disclosure relates to a method of manufacturing a welded part. The manufacturing method includes bringing the nut into contact with a welding surface of a plate-shaped portion of the metal member, and pressing at least one of the plate-shaped portion and the nut, thereby bringing the nut into close contact with the welding surface. In addition, the manufacturing method includes laser welding the metal member and the nut by irradiating a light beam from the opposite side of the welding surface of the plate-shaped portion toward a portion of the nut in close contact with the welding surface.

Description

Technical Field

[0001] The present disclosure relates to a method of manufacturing a welded component. Background Art

[0002] Japanese Patent Publication No. 2003-053567 discloses a method for laser welding a nut having a plurality of protrusions to a steel plate, wherein each protrusion is brought into contact with the steel plate, and a light beam is irradiated from one side of the steel plate toward a gap formed by each protrusion between the nut and the steel plate. Summary of the invention

[0003] However, in the above welding method, since the steel plate and the nut are separated at a distance at the position where the light beam is irradiated, even if the steel material melted by the light beam melts toward the nut, it may not reach the nut and leave a gap. In addition, in the above welding method, thermal expansion and / or thermal contraction will occur in the portion where the light beam is irradiated, causing the nut to tilt during welding and resulting in poor welding between the nut and the steel plate. As a result, the problem of reduced bonding strength between the nut and the steel plate will occur.

[0004] One aspect of the present disclosure preferably provides a technology for improving the joining strength between a nut and a metal member.

[0005] One solution of the present disclosure is a method for manufacturing a welded component, wherein the welded component is formed by welding a metal component and a nut together. The method for manufacturing the welded component includes: abutting the nut against the welding surface of a plate-like portion of the metal component, and pressing at least one of the plate-like portion and the nut, so that the nut and the welding surface are closely fitted. In addition, the method for manufacturing the welded component includes: laser welding the metal component and the nut by irradiating a light beam from the opposite side of the welding surface of the plate-like portion to the portion of the nut that is closely fitted to the welding surface.

[0006] According to the above configuration, the metal component and the nut are laser welded while the nut is in close contact with the welding surface due to the pressure of at least one of the plate-shaped portion and the nut. Therefore, a gap is not likely to be generated between the nut and the welding surface, and poor welding between the nut and the plate-shaped portion due to thermal expansion and / or thermal contraction of the portion irradiated by the light beam is not likely to occur. Therefore, the bonding strength between the nut and the metal component can be improved.

[0007] In one embodiment of the present disclosure, the nut can be tightly fitted on the welding surface by pressing the nut toward the welding surface.

[0008] According to the above configuration, the entire nut can be pressed, and a large pressing force can be easily applied.

[0009] In one embodiment of the present disclosure, the nut may have a plurality of protrusions. Each protrusion may protrude toward the welding surface and may abut against the welding surface. The light beam may be irradiated toward each of the plurality of protrusions.

[0010] According to the above configuration, since the light beam is irradiated toward the portion of the nut that contacts the metal component, that is, each of the plurality of protrusions, the joining strength between the nut and the metal component can be improved even if a gap is formed between the nut and the welding surface due to each protrusion.

[0011] In one embodiment of the present disclosure, the diameter of the light beam at the minimum intersection position may be a length greater than 0.9 times the longest width of each of the plurality of protrusions, wherein the minimum intersection position is a position where the area of ​​the intersection surface included in the intersection region where the plate-like portion intersects with the virtual irradiation region of the light beam is the smallest. The longest width refers to the longest length of each of the plurality of protrusions in the direction in which the region irradiated by the light beam moves during laser welding.

[0012] According to the above configuration, it is possible to suppress the formation of deep holes in each welded portion due to the melting of each protrusion, which is likely to occur due to a small beam diameter, and thus it is possible to ensure that each protrusion is melted appropriately.

[0013] In one aspect of the present disclosure, the welded component may be constructed of an ultra-high tensile strength material.

[0014] According to the above configuration, it is easy to maintain the stability of the joining strength between the ultra-high tensile strength material and the nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a diagram schematically showing welded parts.

[0016] Figure 2 is a bottom view schematically showing a nut.

[0017] Figure 3 It is a diagram schematically showing a method for manufacturing a welded component.

[0018] Figure 4 It is a top view schematically showing a state in which the nut is held by a nut holding portion.

[0019] Figure 5 This is a diagram showing the minimum intersection position of light beams when the object is irradiated in a focused or defocused manner.

[0020] Figure 6 is a diagram showing the beam diameter. DETAILED DESCRIPTION

[0021] Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0022] [1. Composition]

[0023] <Welding parts>

[0024] Figure 1 The welded component 100 shown is a component formed by welding a metal component 1 and a nut 2 together by laser welding.

[0025] For example, the metal component 1 is a thin plate-shaped component with a plate thickness of 3.0 mm or less. In addition, the plate thickness of the metal component is preferably 1.6 mm or less, and more preferably 1.0 mm. The metal component 1 is composed of ultra-high strength steel having a tensile strength of 1180 MPa or more, that is, ultra-high tensile strength material. In addition, the tensile strength of the metal component is more preferably 1470 MPa or more. The metal component 1 has a welding surface 11 for welding the welding nut 2 and a non-welding surface 12 located on the opposite side of the welding surface 11. In addition, the metal component 1 also has at least one hole 13 that penetrates the metal component 1 in the thickness direction, and the thickness direction is the direction in which the welding surface 11 and the non-welding surface 12 are arranged.

[0026] The nut 2 is a square welding nut for projection welding, and is made of, for example, iron or other metal. In addition, when viewed from above, the shape of the nut may be circular or polygonal other than square, and the nut may also have a flange. In addition, the shape of the nut may also be designed to be used for laser welding. Figure 1 and Figure 2 As shown, the nut 2 includes a threaded hole 21 , a first end surface 22 , a second end surface 23 , four protrusions 24 , and a side surface 25 .

[0027] The threaded hole 21 is provided so as to penetrate the nut 2. A bolt or the like can be inserted into the threaded hole 21 in a fastening manner.

[0028] The first end face 22 and the second end face 23 surround the corresponding openings at both ends of the threaded hole 21. The side face 25 connects the first end face 22 and the second end face 23. In the present embodiment, the side face 25 is composed of four faces, and two adjacent faces are orthogonal to each other.

[0029] Each protrusion 24 is a portion melted by laser welding and is a portion protruding from the first end face 22. Each protrusion 24 protrudes toward the welding surface side 11 of the metal component 1 and abuts against the welding surface 11. In the present embodiment, each protrusion 24 extends from the side surface 25 and the first end face 22 in a manner covering the corner portion where the side surface 25 and the first end face 22 intersect. In addition, the protruding portion may extend only from the side surface or may protrude only from the first end face. In the present embodiment, four protrusions 24 are arranged to surround the opening 21A at approximately fixed intervals from each other. Specifically, each protrusion 24 is located at each corner of the nut 2. In addition, the number of protrusions may be, for example, three or more than five.

[0030] Each protrusion 24 has a front end surface 241 that abuts against the welding surface 11. Figure 2 As shown in FIG. 1 , the front end face 241 has a semicircular shape, and the straight portion of the outer edge of the front end face 241 is opposite to the central axis A passing through the center of the threaded hole 21 of the nut 2. In addition, the protrusions may have various shapes. In the following description, the welded portions between the metal component 1 and the nut 2 formed by melting the metal component 1 and each protrusion 24 by laser welding are respectively referred to as welded portions 24A.

[0031] <Laser welding equipment>

[0032] Next, use Figure 3 and Figure 4 The laser welding device 200 will be described. Figure 3 The state of the metal member 1 and the nut 2 when laser welding is performed using the laser welding device 200 is shown. Figure 4 The nut 2 is shown in a state held by a nut holding portion 6 described later. The laser welding device 200 includes a material fixing jig 3, a jig support 4, a clamp 5, a nut holding portion 6, a pressurizing cylinder 7, and a laser irradiator 8.

[0033] The material fixing jig 3 and the jig support 4 are arranged to be opposed to each other in the up-down direction, and the material fixing jig 3 and the jig support 4 are jigs capable of clamping the metal component 1 arranged therebetween. The jig support 4 is arranged below the material fixing jig 3. In the present embodiment, the jig support 4 is configured to form an internal space for arranging the nut 2 to be welded to the metal component 1. The material fixing jig 3 is configured to form a space above the internal space for irradiating the light beam L from the laser irradiator 8 described below onto the metal component 1. For example, Figure 3 As shown, the first end 14 and the second end 15 of the metal component 1 are clamped by the material fixing fixture 3 and the fixture support 4 .

[0034] The clamp 5 is a fixture for fixing the material fixing jig 3 and the jig support 4. The clamp 5 is arranged above the material fixing jig 3. The clamp 5 is arranged so as not to hinder the light beam L irradiated from the laser irradiator 8 described below. In addition, the function of the clamp can be to press the material fixing jig downward, so that the metal component 1 is pressed against the nut 2.

[0035] The nut holding portion 6 is a jig for holding the nut 2. The nut holding portion 6 holds the nut 2 in a state where each protrusion 24 of the nut 2 faces upward. The nut holding portion 6 includes a bottom portion 61 and four holding claws 62.

[0036] The nut 2 is arranged on the base 61 , and the base 61 is a plate-shaped member having a quadrangular outer shape in a plan view. The base 61 has a contact surface 611 that contacts the second end surface 23 of the nut 2 .

[0037] Each retaining claw 62 is a portion protruding from the abutting surface 611 of the base 61, and each retaining claw 62 abuts against the side surface 25 of the nut 2. Figure 3 As shown, each retaining claw 62 extends from the end surface of the base 61. In addition, the retaining claw may also protrude from the portion of the abutting surface of the base that is not in contact with the nut 2. In this embodiment, as shown in FIG. Figure 4 As shown, four retaining claws 62 are arranged around the base 61 at approximately fixed intervals. Specifically, each retaining claw 62 is located at a position approximately in the center of the four faces constituting the end face of the base 61. In addition, the number of retaining claws may be, for example, two or three. As described above, since the four protrusions 24 of the nut 2 are respectively located at the four corners of the nut 2, when the nut 2 is arranged on the base 61, each protrusion 24 of the nut 2 is arranged between two adjacent retaining claws 62.

[0038] This makes it easy to position the nut 2 on the nut holding portion 6 in the laser welding device 200. In addition, the nut 2 can be restricted from rotating about the central axis A by the four holding claws 62.

[0039] The pressurizing cylinder 7 is a device for pressing the nut 2 toward the welding surface 11 of the metal component 1. The pressurizing cylinder 7 is arranged in the above-mentioned internal space formed by the clamp support 4 and is arranged below the nut holding portion 6. The pressurizing cylinder 7 presses the nut 2 to the welding surface 11 by pushing the nut holding portion 6 upward.

[0040] The laser irradiator 8 is disposed above the clamp 5 and is a device for irradiating the light beam L downward. The laser irradiator 8 is configured to be able to change the beam diameter of the light beam L by defocusing. In this embodiment, the light beam L irradiates the irradiated object M1 in a focused manner. Focusing means that Figure 5 As shown in the irradiated object M1 in FIG, the focus H of the light beam L is directed to the back of the irradiated object M1. In addition, the light beam L may also irradiate the irradiated object M1 in a defocused manner. Defocusing means that Figure 5 As shown in the irradiated object M2 in the figure, the focus H of the light beam L is aligned in front of the irradiated object M2. However, in the case of focusing, the diameter of the irradiation area of ​​the light beam L decreases as it approaches the irradiation direction of the light beam L. Therefore, compared with the case of defocusing, the heat of the light beam L is easy to be concentrated on the irradiated object M1. Figure 5 and Figure 6 As shown, the beam diameter d is the diameter of the irradiation area of ​​the beam L at the minimum intersection position L1 of the beam L. At the minimum intersection position L1, the area of ​​the intersection surface included in the intersection area R1 where the irradiated object M1 intersects with the virtual irradiation area of ​​the beam L or the intersection area R2 where the irradiated object M2 intersects with the virtual irradiation area of ​​the beam L is minimum. The virtual irradiation area of ​​the beam L refers to the irradiation area of ​​the beam L when there are no irradiated objects M1 and M2. The intersection surface is a surface extending perpendicularly to the thickness direction at any position in the thickness direction of the irradiated objects M1 and M2. In addition, the laser irradiation device can have a change component such as a DOE (diffractive optical element) that can change the path of light so as to be able to change the size of the beam diameter of the beam.

[0041] <Method for manufacturing welded parts using laser welding device>

[0042] use Figure 2 and Figure 3 , a method for manufacturing the welded component 100 using the laser welding device 200 will be described.

[0043] First, the nut 2 is brought into contact with the welding surface 11 of the metal component 1. Specifically, the nut 2 is placed on the nut holding portion 6, which is placed on the pressurizing cylinder 7, so that each protrusion 24 of the nut 2 is facing upward. Then, the metal component 1 is placed on the nut 2 in such a way that the threaded hole 21 of the nut 2 and the hole 13 of the metal component 1 overlap and each protrusion 24 is brought into contact with the metal component 1. Then, the metal component 1 placed on the nut 2 is fixed by the material fixing jig 3, the jig support 4, and the clamp 5.

[0044] Next, the nut 2 is pressed toward the metal component 1 (i.e., upward) by the pressurizing cylinder 7. As a result, the front end faces 241 of the protrusions 24 of the nut 2 are closely attached to the welding surface 11 of the metal component 1. In addition, as described above, the metal component 1 is fixed by the material fixing jig 3, the jig support 4, and the clamp 5. Therefore, even if the pressing force F applied to the nut 2 by the pressurizing cylinder 7 acts on the metal component 1, it is possible to suppress the metal component 1 from rising.

[0045] Next, the laser irradiator 8 irradiates the metal component 1 and the nut 2 with a light beam L from the non-welding surface 12 side toward the portion of the nut 2 that is in close contact with the welding surface 11, thereby laser welding the metal component 1 and the nut 2. In the present embodiment, the light beam L is irradiated from the non-welding surface 12 side toward each protrusion 24 of the nut 2. Specifically, the light beam L is irradiated onto the non-welding surface 12 of the metal component 1, and the metal component 1 is first melted by the heat of the light beam L. Subsequently, the melting continues by the heat of the light beam L, thereby melting each protrusion 24. Moreover, the molten portion between the metal component 1 and each protrusion 24 is subsequently cooled, thereby forming four welded portions 24A.

[0046] In this embodiment, one protrusion 24 is selected from the four protrusions 24, and the selected first protrusion 24 is first irradiated with the light beam L. Then, other protrusions 24 are selected in the clockwise direction, and the light beam L is sequentially irradiated toward each protrusion 24. Thus, in this embodiment, four welded portions 24A are formed.

[0047] The irradiation area of ​​the light beam L is along Figure 2 The welding direction indicated by the middle arrow moves linearly so that the light beam L forms each welding portion 24A. Figure 2 In the example shown, the welding direction is the direction along the first end face 22 of the nut 2 and is parallel to the straight line portion of the outer edge of the front end face 241 of each protrusion 24. In the following description, the longest length of each protrusion 24 of the nut 2 along the welding direction is referred to as the longest width W of each protrusion 24. Figure 2 In the example shown, the longest width W is the diameter of a semicircle formed by the outer edge of the front end surface 241 of each protrusion 24. For example, the longest width W of each protrusion 24 is approximately 2 mm.

[0048] In this embodiment, the light beam L is focused to irradiate the metal component 1, and the metal component 1 is the irradiation object of the light beam L. Therefore, Figure 3As shown, the minimum intersection position L1 of the light beam L is the position where each protrusion 24 in the welding surface 11 of the metal component 1 is closely fitted. In addition, the minimum intersection position of the light beam is not limited to the position where each protrusion 24 in the welding surface 11 is closely fitted, and can also be any position along the thickness direction of the metal component 1. For example, when the light beam irradiates the metal component 1 with defocus, the minimum intersection position of the light beam can be on the non-welding surface 12 of the metal component 1. The beam diameter d of the light beam L is set to be greater than 0.3 mm. In the present embodiment, the beam diameter d is a length greater than 0.9 times the longest width W of each protrusion 24. In addition, it is preferred that the beam diameter d is approximately the same as the longest width W of each protrusion 24. Specifically, when the longest width W of each protrusion 24 is approximately 2 mm, the beam diameter d is set to approximately 1.8 mm so that the longest width W and the beam diameter d are approximately the same.

[0049] [2. Effect]

[0050] According to the embodiments described in detail above, the following effects can be obtained.

[0051] (2a) In the present embodiment, the nut 2 has four protrusions 24, and the light beam L is irradiated toward the portion of the nut 2 that contacts the welding surface 11 of the metal component 1, that is, each protrusion 24. Therefore, in the configuration of the present embodiment, welding failure is less likely to occur compared to the case where the light beam L is irradiated toward the gap between the nut 2 and the welding surface 11. Therefore, the bonding strength between the nut 2 and the metal component 1 can be improved.

[0052] (2b) In the present embodiment, the nut 2 is pressed toward the metal component 1 by the pressurized cylinder 7. Thus, when each protrusion 24 of the nut 2 is in close contact with the welding surface 11 of the metal component 1, the light beam L is irradiated toward each protrusion 24, thereby forming each welding component 24A. Therefore, it is not easy to generate a gap between each welding part 24A and the welding surface 11. In addition, even if the portion irradiated by the light beam L generates thermal expansion and / or thermal contraction, resulting in a force in a tilting direction on the nut 2 during the welding process, the above-mentioned pressing force will suppress the tilt, so that poor welding is not easy to occur between the nut 2 and the metal component 1. As a result, the bonding strength between the nut 2 and the metal component 1 can be further improved.

[0053] (2c) In the present embodiment, the light beam L is irradiated toward the nut 2 from the non-welding surface 12 side of the metal component 1. Here, for example, when the metal component 1 is pressed to press the nut 2 onto the welding surface 11, it is necessary to press the position of the metal component 1 where the nut 2 is not arranged, such as the first end 14 and the second end 15 of the metal component 1, so that the light beam L is not obstructed. In this case, if the pressing force applied to the metal component 1 increases, problems such as bending of the metal component 1 may occur. On the other hand, as described in the present embodiment, by pressing the nut 2 by the pressurized cylinder 7, the nut 2 is pressed onto the welding surface 11, and the entire nut 2 can be pressed without obstructing the light beam L. Therefore, it is easy to apply a large pressing force to the nut 2. As a result, it is easy to improve the close fit between each protrusion 24 of the nut 2 and the welding surface 11.

[0054] (2d) In the present embodiment, the beam diameter d is substantially the same as the longest width W of each protrusion 24. Thus, it is possible to suppress the formation of deep holes at each weld 24A or holes penetrating each weld 24A, which are likely to occur during laser welding due to a small beam diameter. If a hole is formed in the weld, the weld strength is likely to decrease. Therefore, it is possible to suppress the decrease in the joint strength caused by each weld 24A, and ensure that each protrusion 24 is properly melted.

[0055] (2e) For example, when projection welding is used to weld a nut to a metal component with a thin plate thickness made of ultra-high tensile strength material, the distance between the electrode used for projection welding and the protrusion is close. Therefore, the heat applied to the protrusion is easy to dissipate, and the stress caused by thermal shrinkage is easy to concentrate on the welding part, so that the bonding strength between the nut and the metal component is easy to become unstable. On the other hand, as described in the present embodiment, when the nut 2 is laser welded to a metal component 1 with a thin plate thickness made of ultra-high tensile strength material, the heat applied to the protrusion 24 is not easy to dissipate, and the stress caused by thermal shrinkage is not easy to concentrate on the welding component 24A. Therefore, the bonding strength between the nut 2 and the metal component 1 is easy to stabilize. In addition, the average indentation peel strength of the nut 2 to the metal component 1 also tends to be higher. As a result, the quality of the welded component 100 can be improved.

[0056] [3. Other embodiments]

[0057] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments, and various embodiments can be adopted.

[0058] (3a) In the above embodiment, the metal component 1 is a plate-shaped component, but the shape of the metal component is not limited thereto. For example, the metal component may be of various shapes having a plate-shaped portion, wherein the plate-shaped portion is a portion with a relatively thin plate thickness. In the configuration in which the metal component has a plate-shaped portion, the nut 2 is welded to the welding surface of the plate-shaped portion.

[0059] (3b) In the above embodiment, each protrusion 24 of the nut 2 is closely fitted to the welding surface 11 of the metal component 1 by pressing the nut 2 toward the metal component 1, but the method of closely fitting the protrusion to the welding surface is not limited to this. For example, the laser welding device may be provided with a device for pressing the metal component 1 toward the nut 2, so that both the nut 2 and the metal component 1 are pressed toward a direction of close fitting. Alternatively, for example, when the position of the nut 2 is fixed, only the metal component 1 may be pressed toward the nut 2.

[0060] (3c) In the above embodiment, the nut 2 has a plurality of protrusions 24, but the nut may not have any protrusions. In the configuration where the nut has no protrusions, the light beam L is irradiated toward a specific position to be welded in the portion of the nut that is in close contact with the welding surface.

[0061] (3d) In the above embodiment, the beam diameter d is substantially the same as the longest width W of each protrusion 24, however, the size of the beam diameter is not limited thereto. For example, the beam diameter may be smaller than the longest width W. Specifically, when the longest width W is approximately 2 mm, the beam diameter may be, for example, smaller than the longest width W, and may be greater than 0.3 mm. In addition, the beam diameter may be, for example, larger than the longest width W.

[0062] (3e) In the above embodiment, the metal component 1 is exemplified as being made of an ultra-high tensile strength material. However, the metal type of the metal component is not limited thereto, and the metal component may be made of other metals.

[0063] (3f) In the above embodiment, four protrusions 24 are welded one by one in a clockwise direction. However, for example, a plurality of protrusions may be welded one by one in a counterclockwise direction. In addition, for example, after welding a selected protrusion, other protrusions located on a diagonal line of the protrusion may be selected and welded. In addition, for example, a plurality of protrusions may be welded simultaneously by splitting a light beam into a plurality of light beams or using a plurality of light sources to irradiate light beams.

[0064] (3g) In the above embodiment, the nut holding portion 6 has a plurality of holding claws 62. However, if, for example, the laser welding device is provided with a camera, a sensor, etc., and is configured to be able to identify the position of each protrusion 24 through the camera, the sensor, etc., then in this case, the nut holding portion may not have a holding claw. In the case where the nut 2 is arranged in a nut holding portion without a holding claw, the position of each protrusion 24 is easily misaligned. However, when the laser welding device is configured as described above, even if the position of each protrusion 24 is misaligned, the irradiation position of the light beam can be corrected and the light beam can be irradiated toward each protrusion 24.

[0065] (3h) In the above embodiment, the irradiation area of ​​the light beam L moves in a linear shape, but the irradiation area of ​​the light beam L may move in an arc shape or a circular shape, for example.

[0066] (3i) During the laser welding process, a bolt or the like may be inserted into the threaded hole 21 of the nut 2 to prevent spatter from adhering to the non-welding surface 12 of the nut 2. In addition, a device for conveying air may be provided in the laser welding apparatus to prevent spatter from adhering to the non-welding surface 12 of the nut 2 through the air.

[0067] (3j) The functions of one component in the above-mentioned embodiment may be dispersed among multiple components, or the functions of multiple components may be integrated into one component. In addition, a part of the components of the above-mentioned embodiment may be omitted. At least a part of the components of the above-mentioned embodiment may be added to the components of the above-mentioned other embodiments, or at least a part of the components of the above-mentioned embodiment may be replaced with the components of the above-mentioned other embodiments.

[0068] [4. Technical ideas disclosed in this specification]

[0069] [Project 1]

[0070] A method for manufacturing a welding component, wherein the welding component is formed by welding a metal component and a nut together, and the manufacturing method of the welding component is characterized by comprising:

[0071] The nut is brought into contact with a welding surface of a plate-shaped portion of the metal component, and at least one of the plate-shaped portion and the nut is pressed so that the nut is closely fitted to the welding surface; and

[0072] The metal member and the nut are laser welded by irradiating a light beam from the opposite side of the plate-shaped portion to a portion of the nut in close contact with the welding surface.

[0073] [Project 2]

[0074] The method for manufacturing a welded component according to item 1 is characterized in that:

[0075] The nut is pressed toward the welding surface to tightly fit the nut on the welding surface.

[0076] [Item 3]

[0077] The method for manufacturing a welded component according to item 1 or 2, characterized in that:

[0078] The nut has a plurality of protrusions, which protrude toward the welding surface and abut against the welding surface.

[0079] The light beam is irradiated toward each of the plurality of protrusions.

[0080] [Item 4]

[0081] The method for manufacturing a welded component according to item 3 is characterized in that:

[0082] The diameter of the light beam at the minimum intersection position is greater than 0.9 times the longest width of each of the multiple protrusions, wherein the minimum intersection position is the position where the area of ​​the intersection surface contained in the intersection area where the plate-like portion intersects with the virtual irradiation area of ​​the light beam is the smallest.

[0083] The longest width refers to the longest length of each of the plurality of protrusions in the direction in which the region irradiated by the light beam moves during the laser welding.

[0084] [Item 5]

[0085] The method for manufacturing a welded component according to any one of items 1 to 4, characterized in that the metal component is made of an ultra-high tensile strength material.

Claims

1. A method for manufacturing a welded component, wherein the welded component is formed by welding a metal component and a nut together, and the method for manufacturing the welded component is characterized by comprising: The nut is brought into contact with a welding surface of a plate-shaped portion of the metal component, and at least one of the plate-shaped portion and the nut is pressed so that the nut is closely fitted to the welding surface; and The metal member and the nut are laser welded by irradiating a light beam from the opposite side of the plate-shaped portion to a portion of the nut in close contact with the welding surface.

2. The method for manufacturing a welded component according to claim 1, characterized in that: The nut is pressed toward the welding surface to tightly fit the nut on the welding surface.

3. The method for manufacturing a welded component according to claim 1 or 2, characterized in that: The nut has a plurality of protrusions, which protrude toward the welding surface and abut against the welding surface. The light beam is irradiated toward each of the plurality of protrusions.

4. The method for manufacturing a welded component according to claim 3, characterized in that: The diameter of the light beam at the minimum intersection position is a length that is greater than or equal to 0.9 times the longest width of each of the plurality of protrusions, wherein the minimum intersection position is a position where the area of ​​the intersection surface included in the intersection region where the plate-like portion intersects with the virtual irradiation region of the light beam is the smallest; The longest width refers to the longest length of each of the plurality of protrusions in the direction in which the region irradiated by the light beam moves during the laser welding.

5. The method for manufacturing a welded component according to claim 1 or 2, characterized in that: The metal component is composed of ultra-high tensile strength material.

Images