Manufacturing method for welded components

Abstract

To provide a technique for improving joint strength between a nut and a metal member.SOLUTION: The invention relates to a manufacturing method of a welded member in which a metal member and a nut are welded. The manufacturing method of the welded member includes: bringing the nut into abutment with a welding surface of a plate-shaped portion of the metal member and pressing at least one of the plate-shaped portion or the nut to bring the nut into close contact with the welding surface. The manufacturing method further includes radiating a beam to a portion of the nut in close contact with the welding surface from a side opposite to the welding surface of the plate-shaped portion to weld the metal member and the nut to each other by laser welding.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a welded member.

Background Art

[0002] Patent Document 1 discloses a welding method for laser-welding a nut having a protrusion and a steel plate. In this welding method, the protrusion is brought into contact with the steel plate, and a beam is irradiated from the steel plate side toward a gap formed between the nut and the steel plate by the protrusion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above-described welding method, since the steel plate and the nut are separated at the position where the beam is irradiated, even if the steel melted by the beam melts out toward the nut, it may not reach the nut and a gap may remain. Further, in the above-described welding method, the nut tilts during welding due to thermal expansion and thermal contraction of the portion irradiated with the beam, and poor welding between the nut and the steel plate is likely to occur. As a result, there has been a problem that the bonding strength between the nut and the steel plate is reduced.

[0005] One aspect of the present disclosure aims to provide a technique for improving the bonding strength between a nut and a metal member.

Means for Solving the Problems

[0006] One aspect of the present disclosure is a method for manufacturing a welded member in which a metal member and a nut are welded together. The method for manufacturing a welded member comprises bringing a nut into contact with the welding surface of a plate-shaped portion of the metal member, and pressing at least one of the plate-shaped portion and the nut to bring the nut into close contact with the welding surface. The method for manufacturing a welded member also comprises irradiating a beam from the opposite side of the welding surface of the plate-shaped portion toward the portion of the nut that is in close contact with the welding surface, thereby laser welding the metal member and the nut.

[0007] In this configuration, the metal member and the nut are laser-welded together 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. As a result, gaps are less likely to form between the nut and the welding surface, and welding defects due to thermal expansion and contraction of the area irradiated by the beam are less likely to occur. Therefore, the joint strength between the nut and the metal member can be improved.

[0008] In one aspect of this disclosure, the nut may be in close contact with the weld surface by being pressed toward the weld surface. With this configuration, the entire nut can be pressed, making it easier to apply a large pressing force.

[0009] In one aspect of this disclosure, the nut may have a projection. The projection may protrude toward the welding surface and come into contact with the welding surface. The beam may be directed toward the projection. With this configuration, the beam is directed towards the protrusion that contacts the metal member of the nut, so even if a gap is formed between the nut and the welding surface due to the protrusion, the joint strength between the nut and the metal member can be improved.

[0010] In one aspect of this disclosure, the beam diameter at the minimum intersection position where the area of ​​the intersecting surface included in the intersection region where the plate-like portion and the virtual irradiation region of the beam intersect is minimized may be at least 0.9 times the maximum width of the projection. The maximum width may be the longest length of the projection along the direction in which the area irradiated by the beam moves during laser welding.

[0011] With this configuration, the occurrence of deep holes in the weld, which are prone to forming when protrusions melt due to a small beam diameter, is suppressed, and the protrusions can be melted appropriately.

[0012] In one aspect of this disclosure, the metal member may be made of ultra-high-tensile steel. With this configuration, the joint strength between the ultra-high-tensile steel and the nut tends to be more stable. [Brief explanation of the drawing]

[0013] [Figure 1] This is a schematic diagram showing a welded component. [Figure 2] This is a schematic bottom view of a nut. [Figure 3] This diagram schematically illustrates the manufacturing method of welded components. [Figure 4] This is a schematic plan view showing the state in which the nut is held by the nut retaining part. [Figure 5] This figure shows the minimum beam intersection point when the beam is irradiated in-focus or out-of-focus onto the object being irradiated. [Figure 6] This figure shows the beam diameter. [Modes for carrying out the invention]

[0014] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. Structure] <Welding components> The welded member 100 shown in Figure 1 is a member formed by laser welding a metal member 1 and a nut 2.

[0015] The metal member 1 is, for example, a thin plate-shaped member with a plate thickness of 3.0 mm or less. Note that the plate thickness of the metal member is preferably 1.6 mm or less, and more preferably 1.0 mm. The metal member 1 is composed of a high-strength steel with a tensile strength of 1180 MPa or more, that is, a super high-tensile material. Note that the tensile strength of the metal member is more preferably 1470 MPa or more. The metal member 1 includes a welding surface 11 to which the nut 2 is welded and a non-welding surface 12 on the side opposite to the welding surface 11. Further, the metal member 1 includes at least one hole 13 that penetrates the metal member 1 in the thickness direction, which is the direction in which the welding surface 11 and the non-welding surface 12 are arranged side by side.

[0016] The nut 2 is, for example, a square welding nut used for projection welding made of a metal such as iron. Note that the nut may have an outer shape in a circular shape or a polygonal shape other than a square in a plan view, or may have a flange. Further, the nut may be designed in a shape for laser welding. As shown in FIGS. 1 and 2, the nut 2 includes a screw hole 21, a first end surface 22, a second end surface 23, four protrusions 24, and a side surface 25.

[0017] The screw hole 21 is provided so as to penetrate the nut 2. A bolt or the like can be inserted into the screw hole 21 in a fastening manner. The first end surface 22 and the second end surface 23 surround the respective openings located at both ends of the screw hole 21, and the side surface 25 connects the first end surface 22 and the second end surface 23. In the present embodiment, the side surface 25 is composed of four surfaces, and two adjacent surfaces are orthogonal to each other.

[0018] The protruding portion 24 is a portion to be melted by laser welding and protrudes from the first end face 22. The protruding portion 24 protrudes toward the welding surface 11 side of the metal member 1 and abuts against the welding surface 11. In the present embodiment, the protruding portion 24 extends from the side surface 25 and the first end face 22 so as to cover a corner portion where the side surface 25 and the first end face 22 intersect. Note that the protruding portion may extend only from the side surface or may protrude only from the first end face. In the present embodiment, four protruding portions 24 are provided so as to surround the opening 21A at a substantially constant interval. Specifically, the protruding portions 24 are located at each corner of the nut 2. Note that the number of protruding portions may be, for example, three or five or more.

[0019] The protruding portion 24 has a tip surface 241 that abuts against the welding surface 11. As shown in FIG. 2, the outer shape of the tip surface 241 is semicircular, and the straight portion of the outer edge of the tip surface 241 faces the central axis A passing through the center of the screw hole 21 of the nut 2. Note that the protruding portion can take various shapes. In the following description, the welded portion between the metal member 1 and the nut 2 formed by melting the metal member 1 and the protruding portion 24 by laser welding is referred to as a welded portion 24A.

[0020] <Laser welding apparatus> Next, the laser welding apparatus 200 will be described with reference to FIGS. 3 and 4. FIG. 3 shows a state during laser welding of the metal member 1 and the nut 2 by the laser welding apparatus 200. FIG. 4 shows a state in which the nut 2 is held by a nut holding portion 6 described later. The laser welding apparatus 200 includes a material fixing clamp 3, a clamp receiver 4, a clamper 5, a nut holding portion 6, a pressure cylinder 7, and a laser irradiator 8.

[0021] The material fixing clamp 3 and the clamp receiver 4 are arranged to face each other in the vertical direction, and are jigs capable of holding a metal member 1 between them. The clamp receiver 4 is positioned below the material fixing clamp 3. In this embodiment, the clamp receiver 4 is configured to have an internal space for positioning a nut 2 to be welded to the metal member 1. The material fixing clamp 3 is configured to have a space above the aforementioned internal space for irradiating the metal member 1 with a beam L from a laser irradiator 8, which will be described later. For example, as shown in Figure 3, the first end 14 and the second end 15 of the metal member 1 are held between the material fixing clamp 3 and the clamp receiver 4.

[0022] The clamper 5 is a fastener for securing the material fixing clamp 3 and the clamp receiver 4. The clamper 5 is positioned above the material fixing clamp 3. The clamper 5 is positioned so as not to obstruct the beam L irradiated from the laser irradiator 8, which will be described later. The clamper may also function to press the material fixing clamp downwards, causing the metal member 1 to be pressed towards the nut 2.

[0023] The nut holding part 6 is a jig for holding the nut 2. The nut holding part 6 holds the nut 2 with the projection 24 of the nut 2 facing upward. The nut holding part 6 comprises a base part 61 and a holding claw 62.

[0024] The base 61 is a plate-shaped member with a rectangular outer shape in plan view, on which the nut 2 is positioned. The base 61 has a contact surface 611 that abuts against the second end face 23 of the nut 2. The retaining claws 62 are portions that protrude beyond the contact surface 611 of the base 61 and contact the side surface 25 of the nut 2. In this embodiment, as shown in Figure 3, the retaining claws 62 extend from the end surface of the base 61. The retaining claws may also protrude from portions of the contact surface of the base that do not contact the nut 2. In this embodiment, as shown in Figure 4, four retaining claws 62 are provided so as to surround the base 61 at approximately constant intervals. Specifically, the retaining claws 62 are located approximately in the center of the four surfaces that constitute the end surface of the base 61. The number of retaining claws may be, for example, two or three. As described above, the projections 24 of the nut 2 are located at each of the four corners of the nut 2, so when the nut 2 is placed on the base 61, the projections 24 of the nut 2 are positioned between two adjacent retaining claws 62.

[0025] This facilitates the positioning of the nut 2 relative to the nut holding portion 6 in the laser welding apparatus 200. Furthermore, rotation of the nut 2 around its central axis A can be suppressed by the holding claws 62.

[0026] The pressurizing cylinder 7 is a device for pressing the nut 2 toward the welded surface 11 of the metal member 1. The pressurizing cylinder 7 is positioned in the internal space formed by the clamp receiver 4 and below the nut holding portion 6. The pressurizing cylinder 7 presses the nut 2 toward the welded surface 11 by pushing the nut holding portion 6 upward.

[0027] The laser irradiator 8 is positioned above the clamper 5 and irradiates a beam L downward. The laser irradiator 8 is configured so that the beam diameter of the beam L can be changed by defocusing. In this embodiment, the beam L is irradiated in focus on the object to be irradiated. In focus means that the focal point H of the beam L meets behind the object to be irradiated M1, as shown in the object to be irradiated M1 in Figure 5. The beam L may also be irradiated out of focus on the object to be irradiated. Out of focus means that the focal point H of the beam L meets in front of the object to be irradiated M2, as shown in the object to be irradiated M2 in Figure 5. However, in the case of in focus, the diameter of the irradiation area of ​​the beam L decreases as it moves in the direction of irradiation, so it is easier to concentrate the heat of the beam L on the object to be irradiated M1 compared to the case of out of focus. As shown in Figures 5 and 6, the beam diameter d is the diameter of the beam L's irradiation area at the minimum intersection position L1 where the area of ​​the intersecting surface included in the intersection region R1 or R2 where the irradiated object M1 or M2 intersects with the virtual irradiation area of ​​the beam L is minimized. The virtual irradiation area of ​​the beam L is the irradiation area of ​​the beam L when the irradiated objects M1 and M2 are not present. The intersecting surface is a surface that extends approximately perpendicular to the thickness direction at any position in the thickness direction of the irradiated objects M1 and M2. The laser irradiator may be equipped with a modifying member, such as a DOE (Diffractive Optical Element), to change the beam diameter.

[0028] <Method for manufacturing welded components using a laser welding device> A method for manufacturing a welded member 100 using a laser welding apparatus 200 will be described with reference to Figures 2 and 3.

[0029] First, the nut 2 is brought into contact with the welded surface 11 of the metal member 1. Specifically, the nut 2 is placed on the nut holding part 6, which is positioned on the pressurizing cylinder 7, with the projection 24 facing upward. Then, the metal member 1 is placed on the nut 2 so that the threaded hole 21 of the nut 2 and the hole 13 of the metal member 1 overlap, and the projection 24 and the metal member 1 come into contact. The metal member 1 placed on the nut 2 is then fixed by the material fixing clamp 3, the clamp receiver 4, and the clamper 5.

[0030] Next, the pressurizing cylinder 7 presses the nut 2 toward the metal member 1 (i.e., upward). As a result, the tip surface 241 of the projection 24 of the nut 2 comes into close contact with the welded surface 11 of the metal member 1. As mentioned above, since the metal member 1 is fixed by the material fixing clamp 3, clamp receiver 4 and clamper 5, even when the force F applied by the pressurizing cylinder 7 to press the nut 2 toward the metal member 1, the metal member 1 does not lift up.

[0031] Next, a beam L is irradiated from the laser irradiator 8 from the non-welded surface 12 side of the metal member 1 toward the portion of the nut 2 that is in close contact with the welded surface 11, and the metal member 1 and the nut 2 are laser welded. In this embodiment, the beam L is irradiated from the non-welded surface 12 side toward the projection 24 of the nut 2. Specifically, the beam L strikes the non-welded surface 12 of the metal member 1, and the metal member 1 is first melted by the heat of the beam L. Then, the melting due to the heat of the beam L proceeds further, and the projection 24 is melted. Then, as the molten portion between the metal member 1 and the projection 24 cools, the welded portion 24A is formed.

[0032] In this embodiment, one of the four protrusions 24 is selected, and the beam L is first directed towards the selected first protrusion 24. Then, the other protrusions 24 are selected in a clockwise direction, and the beam L is directed towards each protrusion 24 in turn. As a result, in this embodiment, four welded joints 24A are formed.

[0033] The beam L moves linearly along the welding direction indicated by the arrow in Figure 2, forming the welded portion 24A. In the example shown in Figure 2, the welding direction is along the first end face 22 of the nut 2 and parallel to the straight portion of the outer edge of the tip face 241 of each projection 24. In the following description, the longest length of the projection 24 of the nut 2 along the welding direction is referred to as the longest width W of the projection 24. In the example shown in Figure 2, the longest width W is the diameter of the semicircle traced by the outer edge of the tip face 241 of the projection 24. For example, the longest width W of the projection 24 is approximately 2 mm.

[0034] In this embodiment, the beam L is irradiated in-focus onto the metal member 1, which is the object to be irradiated by the beam L. Therefore, as shown in Figure 3, the minimum intersection position L1 of the beam L is the position where the projection 24 on the weld surface 11 of the metal member 1 is in close contact. Note that the minimum intersection position of the beam is not limited to the position where the projection 24 on the weld surface 11 is in close contact, but may be any position along the thickness direction of the metal member 1. For example, when the beam is irradiated out-of-focus onto the metal member 1, the minimum intersection position of the beam may be on the non-welded surface 12 of the metal member 1. The beam diameter d of the beam L is set to 0.3 mm or more. In this embodiment, the beam diameter d is 0.9 times or more the maximum width W of the projection 24. It is preferable that the beam diameter d is approximately the same as the maximum width W of the projection 24. Specifically, when the maximum width W of the projection 24 is approximately 2 mm, the beam diameter d is set to approximately 1.8 mm, and the maximum width W and the beam diameter d are approximately the same.

[0035] [2. Effects] According to the embodiments described in detail above, the following effects can be obtained. (2a) In this embodiment, the nut 2 has a projection 24, and the beam L is irradiated toward the projection 24, which is the part of the nut 2 that contacts the welding surface 11 of the metal member 1. Therefore, in the configuration of this embodiment, welding defects are less likely to occur compared to the case in which the beam L is irradiated toward the gap between the nut 2 and the welding surface 11. As a result, the joint strength between the nut 2 and the metal member 1 can be improved.

[0036] (2b) In this embodiment, the nut 2 is pressed toward the metal member 1 by the pressurizing cylinder 7. As a result, the projection 24 of the nut 2 is in close contact with the welding surface 11 of the metal member 1, and the beam L is irradiated toward the projection 24, forming the welded portion 24A. Therefore, it is difficult for a gap to form between the welded portion 24A and the welding surface 11. In addition, even if a force is generated in the direction of tilting of the nut 2 during laser welding due to thermal expansion or contraction of the part irradiated by the beam L, this tilting is suppressed by the pressing described above, so welding defects are less likely to occur. Therefore, the joint strength between the nut 2 and the metal member 1 can be further improved.

[0037] (2c) In this embodiment, the beam L is irradiated from the non-welded surface 12 side of the metal member 1 toward the nut 2. Here, for example, when pressing the metal member 1 to press the nut 2 against the welding surface 11, it is necessary to press the positions on the metal member 1 where the nut 2 is not placed, for example, the first end 14 and the second end 15 of the metal member 1, so as not to obstruct the beam L. In this case, if the pressing force applied to the metal member 1 is increased, problems such as bending of the metal member 1 may occur. On the other hand, as in this embodiment, when the nut 2 is pressed against the welding surface 11 by the pressurizing cylinder 7, the entire nut 2 can be pressed without obstructing the 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 degree of contact between the projection 24 of the nut 2 and the welding surface 11.

[0038] (2d) In this embodiment, the beam diameter d is approximately the same as the longest width W of the projection 24. This suppresses the occurrence of deep holes in the welded portion 24A, or holes penetrating the welded portion 24A, which tend to occur during laser welding when the beam diameter is small. When holes occur in the welded portion, the welding strength tends to decrease. Therefore, the projection 24 can be properly melted while suppressing the decrease in joint strength due to the welded portion 24A.

[0039] (2e) For example, when projection welding is used to weld a nut to a metal member made of a thin, ultra-high-strength steel, the distance between the electrode used in projection welding and the projection becomes short. As a result, heat applied to the projection easily dissipates, stress due to thermal shrinkage etc. tends to concentrate in the welded area, and the joint strength between the nut and the metal member tends to become unstable. On the other hand, as in this embodiment, when the nut 2 is laser-welded to the metal member 1 made of a thin, ultra-high-strength steel, heat applied to the projection 24 does not easily dissipate, and stress due to thermal shrinkage etc. tends to concentrate in the welded area 24A. As a result, the joint strength between the nut 2 and the metal member 1 tends to be stable. In addition, the average indentation peel load of the nut 2 against the metal member 1 tends to be high. As a result, the quality of the welded member 100 can be improved.

[0040] [3. Other Embodiments] While embodiments of this disclosure have been described above, it goes without saying that this disclosure is not limited to the embodiments described above and can take various forms.

[0041] (3a) In the above embodiment, the metal member 1 was a plate-shaped member, but the shape of the metal member is not limited to this. For example, the metal member may have various shapes, including a plate-shaped portion which is a thin part of the plate. In a configuration in which the metal member has a plate-shaped portion, the nut 2 is welded to the welding surface of the plate-shaped portion.

[0042] (3b) In the above embodiment, the projection 24 of the nut 2 was pressed toward the metal member 1, causing it to be in close contact with the welding surface 11 of the metal member 1. However, the method of bringing the projection into close contact with the welding surface is not limited to this. For example, the laser welding apparatus may include a device for pressing the metal member 1 toward the nut 2, so that both the nut 2 and the metal member 1 are pressed toward each other. Alternatively, for example, with the position of the nut 2 fixed, only the metal member 1 may be pressed toward the nut 2.

[0043] (3c) In the above embodiment, the nut 2 had a projection 24, but the nut does not have to have a projection. In a configuration in which the nut does not have a projection, the beam L is directed towards a specific location to be welded among the parts of the nut that are in close contact with the welding surface.

[0044] (3d) In the above embodiment, the beam diameter d was approximately the same as the longest width W of the projection 24, but the size of the beam diameter is not limited to this. For example, the beam diameter may be smaller than the longest width W. Specifically, if the longest width W is about 2 mm, for example, the beam diameter may be smaller than the longest width W and 0.3 mm or more. Also, for example, the beam diameter may be larger than the longest width W.

[0045] (3e) In the above embodiment, a configuration in which the metal member 1 is made of ultra-high-tensile steel was illustrated, but the type of metal used for the metal member is not limited to this, and the metal member may be made of other metals.

[0046] (3f) In the above embodiment, the four protrusions 24 were welded one by one in a clockwise direction. However, for example, multiple protrusions may be welded one by one in a counterclockwise direction. Alternatively, for example, after welding one selected protrusion, another protrusion located diagonally opposite to that protrusion may be selected and welded. Alternatively, multiple protrusions may be welded simultaneously, for example, by splitting a single beam into multiple beams or by using multiple beam sources to irradiate the beam.

[0047] (3g) In the above embodiment, the nut holding portion 6 had retaining claws 62. However, for example, if the laser welding apparatus is equipped with a camera or sensor and configured to recognize the position of the projection 24 using the camera or sensor, the nut holding portion does not need to have retaining claws. When a nut 2 is placed on a nut holding portion that does not have retaining claws, the position of the projection 24 is prone to shifting. However, if the laser welding apparatus is configured as described above, even if the position of the projection 24 shifts, the beam irradiation position can be corrected and the beam can be irradiated toward the projection 24.

[0048] (3h) In the above embodiment, the irradiation area of ​​beam L moved in a straight line, but for example, the irradiation area of ​​beam L may move in a curved line or in a circular line.

[0049] (3i) During laser welding, 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-welded surface 12 of the nut 2. Alternatively, a device for supplying air may be provided in the laser welding apparatus to prevent spatter from adhering to the non-welded surface 12 of the nut 2 with the air.

[0050] (3j) The functions of one component in the above embodiment may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, some parts of the configuration of the above embodiment may be omitted. Also, at least some parts of the configuration of the above embodiment may be added to, replaced with, etc., the configuration of other above embodiments.

[0051] [4. The technical concepts disclosed herein] [Item 1] A method for manufacturing a welded member in which a metal member and a nut are welded together, The nut is brought into contact with the weld surface of the plate-shaped portion of the metal member, and at least one of the plate-shaped portion and the nut is pressed to make the nut tightly adhere to the weld surface. A beam is irradiated from the opposite side of the plate-shaped portion from the welding surface toward the portion of the nut that is in close contact with the welding surface, thereby laser welding the metal member and the nut. A method for manufacturing welded members, comprising:

[0052] [Item 2] A method for manufacturing a welded member as described in item 1, A method for manufacturing a welded member, wherein the nut is pressed toward the weld surface, thereby making close contact with the weld surface.

[0053] [Item 3] A method for manufacturing a welded member as described in item 1 or item 2, The nut has a projection that protrudes toward the welding surface and contacts the welding surface, A method for manufacturing a welded member, wherein the beam is irradiated toward the projection.

[0054] [Item 4] A method for manufacturing a welded member as described in item 3, The beam diameter of the beam at the minimum intersection position where the area of ​​the intersecting surface included in the intersection region where the plate-like portion and the virtual irradiation region of the beam intersect is minimized is at least 0.9 times the maximum width of the projection. A method for manufacturing a welded member, wherein the maximum width is the longest length of the projection along the direction in which the area irradiated by the beam moves during laser welding.

[0055] [Item 5] A method for manufacturing a welded member as described in any one of items 1 to 4, The aforementioned metal member is made of ultra-high-tensile steel, and the method for manufacturing a welded member. [Explanation of Symbols]

[0056] 1...Metal member, 2...Nut, 3...Material fixing clamp, 4...Clamp receiver, 5...Clamper, 6...Nut holder, 7...Pressure cylinder, 8...Laser irradiator, 11...Welded surface, 12...Non-welded surface, 13...Hole, 14...First end, 15...Second end, 21...Screw hole, 21A...Opening, 22...First end face, 23...Second end face, 24...Protrusion, 24A...Welded part, 25...Side, 61...Base, 62...Retaining claw, 100...Welded member, 200...Laser welding device, 241...Tip face, 611...Contact surface, A...Central axis, F...Force, L...Beam, L1...Minimum intersection position, M1, M2...Irradiated object, R1, R2...Intersection region.

Claims

1. A method for manufacturing a welded member in which a metal member and a nut are welded together, The nut is brought into contact with the weld surface of the plate-shaped portion of the metal member, and at least one of the plate-shaped portion and the nut is pressed to make the nut tightly adhere to the weld surface. A beam is irradiated from the opposite side of the plate-shaped portion from the welding surface toward the portion of the nut that is in close contact with the welding surface, thereby laser welding the metal member and the nut. Equipped with, The nut has a projection that protrudes toward the welding surface and contacts the welding surface, A method for manufacturing a welded member, wherein the beam is irradiated toward the projection.

2. A method for manufacturing a welded member according to claim 1, A method for manufacturing a welded member, wherein the nut is pressed toward the weld surface, thereby making close contact with the weld surface.

3. A method for manufacturing a welded member according to claim 1 or claim 2, The beam diameter of the beam at the minimum intersection position where the area of ​​the intersecting surface included in the intersection region where the plate-like portion and the virtual irradiation region of the beam intersect is minimized is at least 0.9 times the maximum width of the projection. A method for manufacturing a welded member, wherein the maximum width is the longest length of the projection along the direction in which the area irradiated by the beam moves during laser welding.

4. A method for manufacturing a welded member according to claim 1 or claim 2, The aforementioned metal member is made of ultra-high-tensile steel, and the method for manufacturing a welded member.

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