Joint structure

Abstract

The third member (30) has a laminated portion (31), a first joining portion (32), and a second joining portion (33). The laminated portion (31) is solidified inside the through portion (11) and extends in a laminating direction. The first joining portion (32) is provided integrally with the laminated portion (31), and the first joining portion (32) is joined with the first plating layer (15a) and the second member (20). The second joining portion (33) is provided integrally with the laminated portion (31), and the second joining portion (33) is joined with the second plating layer (15b).

Description

Technical Field

[0001] This invention relates to a joining structure. Background Technology

[0002] Patent document 1 discloses a joining structure in which a first component (a first metal material) is overlapped with a second component (a dissimilar material) that is difficult to weld to the first component, and a third component (a third material) is melted through the through portion of the second component to perform arc welding.

[0003] At this point, using the molten third component, a flange is formed on the outer periphery of the upper surface side of the through portion of the second component in a manner that covers the outer periphery. Thus, the first component and the second component are fixed together by the compressive fixing force between the flange and the first component generated by the solidification and shrinkage of the third component relative to the first component.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: International Publication No. 2018 / 030272 Summary of the Invention

[0007] The technical problem that the invention aims to solve

[0008] However, in the invention of Patent Document 1, moisture may penetrate from the outside through the gap between the overlapping surfaces of the flange of the third component and the second component, and the gap between the overlapping surfaces of the first component and the second component. Moreover, the infiltrated moisture may cause electrolytic corrosion at the overlapping portions of the flange of the third component and the second component, as well as at the overlapping portions of the first component and the second component, thereby potentially reducing the bonding strength.

[0009] The present disclosure is made in view of this purpose, and its aim is to suppress the occurrence of electro-erosion at the respective overlapping portions of the first, second and third components.

[0010] Technical solutions for solving technical problems

[0011] The first aspect is a joining structure formed by joining a first component, a second component, and a third component together. The first component is made of a metallic material, the second component is made of a material that is difficult to weld to the first component and is stacked on the first component, and the third component is formed by joining three components made of the same type of filler metal as the second component. On the surface of the first component, a plating layer made of the same type of material as the second component is provided. The plating layer includes a first plating layer and a second plating layer. The first plating layer is provided on the surface of the first component facing the second component, and the second plating layer is provided on the surface of the first component opposite to the first plating layer. The first component has a through portion extending in the stacking direction. The third component has a stacked portion, a first joining portion, and a second joining portion. The stacked portion is solidified inside the through portion and extends in the stacking direction. The first joining portion is integrally formed with the stacked portion and is joined with the first plating layer and the second component. The second joining portion is integrally formed with the stacked portion and is joined with the second plating layer.

[0012] In the first aspect, a plating layer made of the same type of material as the second component is applied to the surface of the first component, such that the overlapping portion of the first and second components is made of the same type of material. Furthermore, the first joint portion of the third component, the joint portion with the first plating layer and the second component, and the joint portion of the second joint portion with the second plating layer are also made of the same type of material.

[0013] In this way, by eliminating the direct overlap between metallic and dissimilar materials in the overlapping portions of the first, second, and third components, the occurrence of electrolytic corrosion can be suppressed, ensuring the bonding strength.

[0014] Furthermore, by using the first joint and the second joint to compress and fix the first component and the second component, the overlapping portion of the first component and the second component are tightly attached, making it difficult for moisture to penetrate from the outside.

[0015] Furthermore, even when the inner circumferential surface of the through-hole is not coated and the first component is exposed through the through-hole, by joining the first joint to the first coating and the second joint to the second coating, it is possible to prevent moisture from penetrating into the inner circumferential surface of the through-hole from the outside. Thus, electrolytic corrosion of the inner circumferential surface of the through-hole of the first component can be suppressed, ensuring bonding strength.

[0016] Secondly, based on the joining structure of the first aspect, the second component is provided with a recessed portion in the stacking direction at a position corresponding to the through portion, and when viewed from the stacking direction, the periphery of the recessed portion is located at a position further outward than the periphery of the through portion.

[0017] In the second aspect, when the molten third component flows from the through portion into the recess, the third component extends to a position further outward than the through portion, thereby facilitating the bonding of the first joint portion of the third component to the first coating.

[0018] Thirdly, based on the joining structure of the second aspect, the distance between the periphery of the recess and the periphery of the through portion is at least 0.5 mm.

[0019] In the third aspect, by appropriately setting the distance between the periphery of the recess and the periphery of the through portion, the first joint of the third component can be easily joined to the first plating layer.

[0020] The fourth aspect is that, based on the joining structure of any one of the first to third aspects, the through portion is formed in a circular shape, and the diameter of the through portion is φ7mm or more.

[0021] In the fourth aspect, by forming the through portion into a circular shape and appropriately setting the aperture of the through portion, it is easy to insert the third component, which serves as filler metal, through the through portion. Furthermore, it is possible to increase the joint area between the second and third components, ensuring joint strength.

[0022] The fifth aspect is that, based on the joining structure of any one of the first to third aspects, the through portion is formed in a rectangular shape, and the length of the short side of the through portion is 7 mm or more.

[0023] In the fifth aspect, by forming the through portion into a rectangular shape and appropriately setting the length of the short side of the through portion, it is easy to insert the third component, which serves as filler metal, through the through portion. Furthermore, it is possible to increase the joint area between the second and third components, ensuring joint strength.

[0024] The sixth aspect is that, based on the joining structure of any one of the first to third aspects, the second component and the plating are made of copper or aluminum.

[0025] In the sixth aspect, the second component and the plating are made of copper or aluminum. In this case, the first component can be made of, for example, an ferrous metal.

[0026] The seventh aspect is that, based on the joining structure of any one of the first to third aspects, the peripheral portion of the through portion is formed into a shape that is curved in the stacking direction.

[0027] In the seventh aspect, by bending the peripheral portion of the through-hole, the bonding area between the third component and the plating layer can be increased. For example, by forming the through-hole through a stamping process, the peripheral portion of the through-hole can be made into a curved shape. Furthermore, for example, by forming the through-hole through a drill bit, the peripheral portion of the through-hole can be made into a curved shape by utilizing burrs or the like generated at the periphery of the through-hole.

[0028] The effects of the invention

[0029] According to aspects of this disclosure, it is possible to suppress electrical erosion at the respective overlapping portions of the first component, the second component, and the third component. Attached Figure Description

[0030] Figure 1 This is a perspective view used to illustrate the joining structure involved in this first embodiment.

[0031] Figure 2 It is a side sectional view used to illustrate the joint structure.

[0032] Figure 3 This is a diagram showing the relationship between the inner diameter of the through section and the inner diameter of the recess.

[0033] Figure 4 This is a side sectional view used to illustrate the joining structure involved in this second embodiment.

[0034] Figure 5 This is a side sectional view used to illustrate the joining structure involved in this third embodiment.

[0035] Figure 6 This is a side sectional view used to illustrate the joining structure involved in this fourth embodiment.

[0036] Figure 7 This is a side sectional view used to illustrate the joining structure involved in this fifth embodiment.

[0037] Figure 8 This is a side sectional view used to illustrate the joining structure involved in this sixth embodiment.

[0038] Figure 9 This is a side sectional view used to illustrate the joining structure involved in this seventh embodiment.

[0039] Figure 10 This is a side sectional view used to illustrate the joining structure involved in this eighth embodiment.

[0040] Figure 11 This is a side sectional view used to illustrate the joining structure involved in this ninth embodiment.

[0041] Figure 12This is a side sectional view used to illustrate the joining structure involved in this tenth embodiment.

[0042] Figure 13 This is a side sectional view used to illustrate the joining structure involved in this eleventh embodiment.

[0043] Figure 14 This is a perspective view used to illustrate the joining structure involved in other embodiments. Detailed Implementation

[0044] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the following description of preferred embodiments is merely illustrative and is not intended to limit the present invention, its applications, or its uses.

[0045] First Implementation Method

[0046] Figure 1 and Figure 2 A joining structure is shown for joining a first component 10 made of metallic material, a second component 20 made of a material that is difficult to weld to the first component 10 and stacked on top of the first component 10, and a third component 30 made of filler metal to each other.

[0047] The first component 10 is a plate-shaped component made of metal. A plating layer 15 is provided on the surface of the first component 10. The plating layer 15 is made of the same type of material as the second component 20.

[0048] The plating layer 15 includes a first plating layer 15a and a second plating layer 15b. The first plating layer 15a is disposed on the surface of the first component 10 opposite to the second component 20. Figure 2 The second plating layer 15b is disposed on the surface of the first component 10 opposite to the first plating layer 15a. Figure 2 (The middle is the upper surface).

[0049] It should be noted that the plating layer 15 can also be provided on the outer periphery of the first component 10 in a manner that covers the entire first component 10. A through-hole 11 extending through the first component 10 in the stacking direction is provided. The through-hole 11 is a circular through-hole.

[0050] The second component 20 is a plate-shaped component made of a material that is difficult to weld to the first component 10. The second component 20 overlaps the lower side of the first component 10. In the second component 20, at a position corresponding to the through portion 11, a recess 21 is provided that is recessed in the stacking direction. The recess 21 is formed into a circular shape. When viewed from the stacking direction, the periphery of the recess 21 is located further outward than the periphery of the through portion 11.

[0051] The third component 30 is made of the same type of metal material as the plating 15 of the first component 10 and the second component 20, namely, filler metal. Here, the same type of metal material refers to metals that can be welded to each other, including metal materials with good weldability not only between the same materials, but also between ferrous metals and non-ferrous metals. In other words, the same type of metal material refers to the same type of materials with good weld compatibility.

[0052] Specifically, examples of combinations of the second component 20 and the third component 30 during welding include: for example, combinations of ferrous metals such as mild steel with mild steel, stainless steel with stainless steel, and mild steel with high-tensile strength steel. Furthermore, combinations of non-ferrous metals such as aluminum with aluminum, aluminum with aluminum alloys, aluminum alloys with aluminum alloys, copper with copper, copper with copper alloys, and copper alloys with copper alloys.

[0053] Furthermore, the second component 20, being a dissimilar material, is made of a material different from that of the first component 10, and is made of a material that is difficult to weld to the first component 10.

[0054] For example, when the first component 10, which is a metallic material, is an ferrous metal, the second component 20, which is a dissimilar material, is a non-ferrous metal such as copper or aluminum.

[0055] The third component 30 has a laminated portion 31, a first joint portion 32, and a second joint portion 33. The laminated portion 31 is formed by solidifying molten filler metal inside the through portion 11. The laminated portion 31 extends in the lamination direction inside the through portion 11.

[0056] The first joint 32 is integrally formed with the lower end of the laminated portion 31 in the lamination direction. The first joint 32 extends outward from the periphery of the through portion 11. The first joint 32 is joined to the first plating layer 15a and the second component 20. Specifically, the first joint 32 is welded to the periphery of the through portion 11 in the first plating layer 15a of the first component 10 and the second component 20.

[0057] The second joint 33 is integrally formed with the upper end of the stacked portion 31 in the stacking direction. The second joint 33 extends outward from the periphery of the through portion 11. The second joint 33 is joined to the second plating layer 15b. Specifically, the second joint 33 is welded to the periphery of the through portion 11 in the second plating layer 15b of the first component 10.

[0058] If the third component 30 solidifies and shrinks, the first joint 32 pulls the second component 20 upward, and the second joint 33 presses the first component 10 downward, thereby compressing and fixing the first component 10 and the second component 20.

[0059] <Jointing Method>

[0060] Next, the joining method of the first component 10, the second component 20, and the third component 30 will be described. It should be noted that the following description will describe the case where mild steel is used as the first component 10, aluminum plating is used as the plating layer 15 of the first component 10, aluminum is used as the second component 20, and aluminum is used as the filler metal, i.e., the third component 30.

[0061] It should be noted that although the assumption is that aluminum plating is used as the plating layer 15 of the first component 10, aluminum material is used as the second component 20, and aluminum material is used as the filler metal, i.e., the third component 30, copper can also be used instead of aluminum. Specifically, the case is that copper plating is used as the plating layer 15 of the first component 10, copper material is used as the second component 20, and copper material is used as the filler metal, i.e., the third component 30.

[0062] like Figure 2 As shown, the arc welding machine 1 includes a nozzle 2 and a welding nozzle 3. The nozzle 2 supplies shielding gas or the like to the welding area of ​​the object being welded. The welding nozzle 3 supplies welding current to a third component 30, which serves as filler metal.

[0063] First, the first component 10 is overlapped on the upper surface of the second component 20. At this time, the surface of the second component 20 arranged such that the opening side of the recess 21 abuts against the first component 10. At this time, the through portion 11 of the first component 10 and the recess 21 of the second component 20 are arranged to be approximately concentric when viewed from the stacking direction.

[0064] While feeding the third component 30, which is the same type of filler metal as the second component 20, the arc welding machine 1 supplies welding current to generate an electric arc 5.

[0065] The third component 30, which is molten by arc welding, is filled into the recess 21 through the through portion 11. Within the recess 21, the molten third component 30 flows out toward the outer periphery of the through portion 11 and expands in a flange shape.

[0066] After the molten third component 30 fills the recess 21, it fills the interior of the through portion 11 and is stacked. Then, after the molten third component 30 fills the through portion 11, it flows out to a position further outward than the periphery of the through portion 11, expanding in a flange shape.

[0067] Then, the molten metal solidifies and shrinks, thereby forming a third component 30, which has a stacked portion 31, a first joint portion 32 integrally disposed with the stacked portion 31, and a second joint portion 33 integrally disposed with the stacked portion 31.

[0068] The first joining portion 32 joins with the second component 20 by filling the recess 21. Furthermore, the first joining portion 32 extends into the recess 21 of the second component 20 at a position further outward than the through portion 11, and joins with the periphery of the through portion 11 in the first plating layer 15a.

[0069] The second joint 33 extends to a position further outward than the periphery of the through portion 11 and joins the periphery of the through portion 11 in the second plating layer 15b.

[0070] <The relationship between the inner diameter of the through section and the inner diameter of the recess>

[0071] The following uses Figure 3 The relationship between the inner diameter of the through portion 11 of the first component 10 and the inner diameter of the recess 21 of the second component 20 will be explained. It should be noted that it is assumed that the diameter of the welding wire of the third component 30, which is used as filler metal, is φ1.2mm.

[0072] like Figure 3 As shown, when the inner diameter of the through portion 11 of the first component 10 is φ6mm, even if the inner diameter of the recess 21 of the second component 20 is changed within the range of φ6 to φ10mm, the result is that the molten third component 30 fails to fully fill the through portion 11 of the first component 10. Figure 3 In this context, "△" indicates a welding condition where the filler metal is insufficiently filled. Therefore, the inner diameter of the through portion 11 of the first component 10 is preferably φ7mm or more.

[0073] Furthermore, when the inner diameter of the through portion 11 of the first component 10 is φ7mm, if the inner diameter of the recess 21 of the second component 20 is set to φ7mm, the result is that the first joint portion 32 and the second joint portion 33 of the third component 30 do not extend radially outward along the periphery of the through portion 11. Figure 3 In the diagram, "×" indicates a welding state where the second joint 33 does not extend to the radially outer side of the periphery of the through portion 11. Conversely, "○" indicates a welding state where the second joint 33 extends to the radially outer side of the periphery of the through portion 11.

[0074] Here, if the inner diameter of the through portion 11 of the first component 10 is φ8mm, and the inner diameter of the recess 21 of the second component 20 is set to φ7mm or φ8mm, the welding state is “×”. On the other hand, if the inner diameter of the recess 21 of the second component 20 is set to φ9mm or φ10mm, the welding state is “○”.

[0075] Furthermore, if the inner diameter of the through portion 11 of the first component 10 is φ9mm, and the inner diameter of the recess 21 of the second component 20 is changed within the range of φ7 to φ9mm, the welding state is “×”. On the other hand, if the inner diameter of the recess 21 of the second component 20 is set to φ10mm, the welding state is “○”.

[0076] In other words, the inner diameter of the recess 21 of the second component 20 needs to be larger than the inner diameter of the through portion 11 of the first component 10. For example, the distance between the periphery of the recess 21 and the periphery of the through portion 11 is preferably at least 0.5 mm.

[0077] Thus, by appropriately setting the inner diameter of the through portion 11 and the inner diameter of the recess 21 in the second component 20, the molten third component 30 can be fully filled into the recess 21. As a result, a first joint 32 and a second joint 33 of appropriate shape can be formed.

[0078] -Effects of this implementation method-

[0079] As described above, according to the joining structure involved in this embodiment, by eliminating the overlapping portions of the first component 10, the second component 20 and the third component 30, the occurrence of electrolytic corrosion can be suppressed and the joining strength can be ensured.

[0080] Furthermore, the first component 10 and the second component 20 are compressed and fixed by the first joint 32 and the second joint 33, thereby making the overlapping portions of the first component 10 and the second component 20 fit tightly together, making it difficult for moisture to penetrate from the outside.

[0081] Here, when the plating 15 is not provided on the inner circumferential surface of the through-hole 11 and the first component 10 is exposed through the through-hole 11, the laminated portion 31 arranged within the through-hole 11 comes into contact with the first component 10. Furthermore, due to the difference in thermal shrinkage rates between the first component 10 and the third component 30 during solidification, and due to changes over time, cracks may form in the laminated portion 31. Moreover, if moisture intrudes into the gap between the through-hole 11 and the laminated portion 31, intermetallic compounds may form.

[0082] In this embodiment, by joining the first joint 32 to the first plating layer 15a and the second joint 33 to the second plating layer 15b, it is possible to suppress the intrusion of moisture from the outside into the inner peripheral surface of the penetration portion 11. This prevents electrolytic corrosion from occurring on the inner peripheral surface of the penetration portion 11 of the first component 10, ensuring bonding strength.

[0083] Furthermore, when the molten third component 30 flows from the through portion 11 into the recess 21, the third component 30 extends to a position further outward than the through portion 11, thereby facilitating the bonding of the first joint portion 32 of the third component 30 to the first plating layer 15a. Additionally, a wide first joint portion 32 can be formed.

[0084] Furthermore, by fusing the same materials together, it is possible to inhibit the intrusion of moisture and other substances from the outside and suppress electrolytic corrosion without the need for commonly used adhesives, sealants, or sealing agents.

[0085] Second Implementation Method

[0086] Hereinafter, the same reference numerals will be used to mark the same parts as in the first embodiment described above, and only the differences will be explained.

[0087] like Figure 4 As shown, in the second component 20, a recess 21 is provided at a position corresponding to the through portion 11, which is recessed in the stacking direction. The recess 21 has an inclined portion 25 that slopes toward the bottom of the recess 21. The opening width of the recess 21 is greater than the inner diameter of the through portion 11.

[0088] The third component 30 is fused by arc welding. The molten third component 30 flows along the inclined portion 25 of the recess 21 and joins the second component 20. Inside the recess 21, the molten third component 30 extends radially outward to the through portion 11, and the first joint portion 32 joins the first plating layer 15a.

[0089] Furthermore, the molten third component 30 fills the through portion 11, thereby extending in a flange shape on the upper surface of the first component 10, and the second joint portion 33 is joined to the second plating layer 15b.

[0090] As described above, according to the joining structure of this embodiment, by providing an inclined portion 25 in the recess 21, the molten third component 30 can easily flow to the bottom of the recess 21.

[0091] Third Implementation Method

[0092] like Figure 5 As shown, in the second component 20, a recess 21 is provided at a position corresponding to the through portion 11, which is recessed in the stacking direction. The recess 21 has a stepped portion 26 that is circular when viewed from the stacking direction and an inclined portion 25 that slopes from the stepped portion 26 toward the bottom of the recess 21. The opening width of the recess 21 is greater than the inner diameter of the through portion 11.

[0093] The third component 30 is fused by arc welding. The molten third component 30 flows along the inclined portion 25 of the recess 21 and joins the second component 20. Inside the recess 21, the molten third component 30 fills the inclined portion 25 and the stepped portion 26, thereby extending radially outward to the through portion 11, and the first joint portion 32 joins the first plating layer 15a.

[0094] Furthermore, the molten third component 30 fills the through portion 11, thereby extending in a flange shape on the upper surface of the first component 10, and the second joint portion 33 is joined to the second plating layer 15b.

[0095] As described above, according to the joining structure of this embodiment, by providing an inclined portion 25 and a stepped portion 26 in the recess 21, the joining area of ​​the third component 30 can be increased compared to the case where the bottom of the recess 21 is only a flat surface.

[0096] Fourth Implementation Method

[0097] like Figure 6 As shown, in the second component 20, a recess 21 is provided at a position corresponding to the through portion 11, which is recessed in the stacking direction. The recess 21 has a stepped portion 26 that is circular when viewed from the stacking direction, a flat portion 27 provided at the bottom of the recess 21, and an inclined portion 25 that slopes from the stepped portion 26 toward the flat portion 27. The opening width of the recess 21 is greater than the inner diameter of the through portion 11.

[0098] The third component 30 is fused by arc welding. The molten third component 30 flows along the inclined portion 25 of the recess 21 toward the flat portion 27 and joins the second component 20. Inside the recess 21, the molten third component 30 fills the inclined portion 25, the stepped portion 26 and the flat portion 27, thereby extending radially outward to the through portion 11, and the first joint portion 32 joins the first plating layer 15a.

[0099] Furthermore, the molten third component 30 fills the through portion 11, thereby extending in a flange shape on the upper surface of the first component 10, and the second joint portion 33 is joined to the second plating layer 15b.

[0100] As described above, according to the joining structure of this embodiment, by providing an inclined portion 25, a stepped portion 26 and a flat portion 27 in the recess 21, the joining area of ​​the third component 30 can be increased compared to the case where the bottom of the recess 21 is only a flat surface.

[0101] Fifth Implementation Method

[0102] like Figure 7As shown, the first component 10 has a through portion 11. The through portion 11 has a tapered portion 12 that tapers towards the second component 20. The taper angle of the tapered portion 12 is preferably set in the range of 30° to 120°.

[0103] In the second component 20, a recess 21 is provided at a position corresponding to the through portion 11, which is recessed in the stacking direction. The recess 21 is circular when viewed from the stacking direction. The opening width of the recess 21 is greater than the inner diameter of the second component 20 side of the through portion 11.

[0104] The third component 30 is molten by arc welding. The molten third component 30 flows along the tapered portion 12 of the through portion 11 in a manner that concentrates toward the central portion of the through portion 11.

[0105] As described above, according to the joining structure of this embodiment, the molten third component 30 easily flows towards the center of the through portion 11. Furthermore, since the width of the second joining portion 33 is increased, the joining area with the second plating layer 15b can be increased, ensuring the joining strength.

[0106] The Sixth Implementation Method

[0107] like Figure 8 As shown, the first component 10 has a through portion 11. The through portion 11 has a tapered portion 12 that tapers towards the opposite side of the second component 20. The taper angle of the tapered portion 12 is preferably set in the range of 30° to 120°.

[0108] In the second component 20, a recess 21 is provided at a position corresponding to the through portion 11, which is recessed in the stacking direction. The recess 21 is circular when viewed from the stacking direction. The opening width of the recess 21 is greater than the inner diameter of the second component 20 side of the through portion 11.

[0109] The third component 30 is fused by arc welding. The molten third component 30 fills the recess 21 and joins the second component 20. The molten third component 30 fills the interior of the recess 21, thereby extending radially outward to the through portion 11, and the first joint portion 32 joins the first plating layer 15a.

[0110] Furthermore, the molten third component 30 fills the through portion 11, thereby extending in a flange shape on the upper surface of the first component 10, and the second joint portion 33 is joined to the second plating layer 15b.

[0111] As described above, according to the joining structure of this embodiment, the molten third component 30 can flow along the tapered portion 12 of the through portion 11 to the corner of the recess 21. Furthermore, since the width of the first joining portion 32 is increased, the joining area with the second component 20 can be increased, ensuring the joining strength.

[0112] Furthermore, in this joining structure, for example, in the case of Figure 8 When the arrangement of the first component 10 and the second component 20 shown is rotated by 90°, that is, when arc welding is performed laterally relative to the first component 10 and the second component 20 arranged in a longitudinal position, the molten third component 30 filled in the through portion 11 can be made less likely to droop outward.

[0113] The Seventh Implementation Method

[0114] like Figure 9 As shown, in the second component 20, a recess 21 is provided at a position corresponding to the through portion 11, which is recessed in the stacking direction. The recess 21 is formed by stamping a portion of the second component 20 to make it bulge out to the side opposite to the first component 10. The opening width of the recess 21 is greater than the inner diameter of the second component 20 side of the through portion 11.

[0115] The third component 30 is fused by arc welding. The molten third component 30 fills the recess 21 and joins the second component 20. The molten third component 30 fills the interior of the recess 21, thereby extending radially outward to the through portion 11, and the first joint portion 32 joins the first plating layer 15a.

[0116] Furthermore, the molten third component 30 fills the through portion 11, thereby extending in a flange shape on the upper surface of the first component 10, and the second joint portion 33 is joined to the second plating layer 15b.

[0117] As described above, according to the joining structure involved in this embodiment, a recess 21 can be provided in the second component 20 while maintaining a constant plate thickness, thereby ensuring the rigidity of the second component 20.

[0118] The Eighth Implementation Method

[0119] like Figure 10 As shown, the first component 10 has a through portion 11. The peripheral portion of the through portion 11 is formed into a shape that is curved in the stacking direction. Figure 10 In the example shown, the peripheral portion of the through portion 11 faces the side opposite to the second component 20. Figure 10 The upper part (in the middle) is curved into a convex shape. Figure 10 In the case of the through portion 11, the peripheral portion is formed in a shape that is bent at 45° relative to the lower surface of the first component 10, but it can also be formed in a shape that is bent in the range of 15° to 60°.

[0120] Here, for example, the through portion 11 is formed by stamping, thereby enabling the peripheral portion of the through portion 11 to be formed into a curved shape. Alternatively, for example, the through portion 11 is formed by drilling, and the peripheral portion of the through portion 11 can be formed into a curved shape by utilizing burrs or the like generated at the periphery of the through portion 11.

[0121] The third component 30 is fused by arc welding. The molten third component 30 fills the space separated by the peripheral curved portion of the through portion 11 in the first component 10 and the second component 20, and is joined to the second component 20. The molten third component 30 fills the space separated by the peripheral curved portion of the through portion 11 in the first component 10 and the second component 20, thereby extending radially outward from the through portion 11, and the first joint 32 is joined to the first plating layer 15a.

[0122] Furthermore, the molten third component 30 fills the through portion 11, thereby extending in a flange shape on the upper surface of the first component 10, and the second joint portion 33 is joined to the second plating layer 15b.

[0123] As described above, according to the joining structure of this embodiment, by bending the peripheral portion of the through portion 11, the joining area between the third component 30 and the plating layer 15 can be increased.

[0124] Ninth Implementation Method

[0125] like Figure 11 As shown, the first component 10 has a through portion 11. The peripheral portion of the through portion 11 is formed into a shape that is curved in the stacking direction. Figure 11 In the example shown, the peripheral portion of the through portion 11 faces the side opposite to the second component 20. Figure 11 The upper part (in the middle) is curved into a convex shape. Figure 11 In this case, the peripheral portion of the through portion 11 is designed to be curved at 90° relative to the lower surface of the first component 10.

[0126] The third component 30 is fused by arc welding. The molten third component 30 fills the space separated by the peripheral curved portion of the through portion 11 in the first component 10 and the second component 20, and is joined to the second component 20. The molten third component 30 fills the space separated by the peripheral curved portion of the through portion 11 in the first component 10 and the second component 20, thereby extending radially outward from the through portion 11, and the first joint 32 is joined to the first plating layer 15a.

[0127] Furthermore, the molten third component 30 fills the through portion 11, thereby extending in a flange shape on the upper surface of the first component 10, and the second joint portion 33 is joined to the second plating layer 15b.

[0128] As described above, according to the joining structure of this embodiment, by bending the peripheral portion of the through portion 11, the joining area between the third component 30 and the plating layer 15 can be increased.

[0129] The Tenth Implementation Method

[0130] like Figure 12 As shown, the first component 10 has a through portion 11. The peripheral portion of the through portion 11 is formed into a shape that is curved in the stacking direction. Figure 12 In the example shown, the peripheral portion of the through portion 11 faces the side opposite to the second component 20. Figure 12 The lower part (in the middle) is curved into a convex shape. Figure 12 In this case, the peripheral portion of the through portion 11 is set to a shape that is bent at 45° relative to the upper surface of the first component 10, but it can also be set to a shape that is bent in the range of 15° to 60°.

[0131] In the second component 20, a recess 21 is provided at a position corresponding to the through portion 11, which is recessed in the stacking direction. The recess 21 is circular when viewed from the stacking direction. A portion of the curved portion of the periphery of the through portion 11 in the first component 10 is accommodated in the recess 21. The opening width of the recess 21 is greater than the inner diameter of the through portion 11.

[0132] The third component 30 is fused by arc welding. The molten third component 30 fills the recess 21 and joins the second component 20. Inside the recess 21, the molten third component 30 extends radially outward to the through portion 11, and the first joint portion 32 joins the first plating layer 15a.

[0133] Furthermore, the molten third component 30 fills the through portion 11, thereby extending in a flange shape on the upper surface of the first component 10, and the second joint portion 33 is joined to the second plating layer 15b.

[0134] As described above, according to the joining structure of this embodiment, by bending the peripheral portion of the through portion 11, the joining area between the third component 30 and the plating layer 15 can be increased.

[0135] Eleventh Implementation Method

[0136] like Figure 13 As shown, the first component 10 has a through portion 11. The peripheral portion of the through portion 11 is formed into a shape that is curved in the stacking direction. Figure 13 In the example shown, the peripheral portion of the through portion 11 faces the side opposite to the second component 20. Figure 13 The lower part (in the middle) is curved into a convex shape. Figure 13 In this case, the peripheral portion of the through portion 11 is designed to be curved at 90° relative to the upper surface of the first component 10.

[0137] In the second component 20, a recess 21 is provided at a position corresponding to the through portion 11, which is recessed in the stacking direction. The recess 21 is circular when viewed from the stacking direction. A portion of the curved portion of the periphery of the through portion 11 in the first component 10 is accommodated in the recess 21. The opening width of the recess 21 is greater than the inner diameter of the through portion 11.

[0138] The third component 30 is fused by arc welding. The molten third component 30 fills the recess 21 and joins the second component 20. Inside the recess 21, the molten third component 30 extends radially outward to the through portion 11, and the first joint portion 32 joins the first plating layer 15a.

[0139] Furthermore, the molten third component 30 fills the through portion 11, thereby extending in a flange shape on the upper surface of the first component 10, and the second joint portion 33 is joined to the second plating layer 15b.

[0140] As described above, according to the joining structure of this embodiment, by bending the peripheral portion of the through portion 11, the joining area between the third component 30 and the plating layer 15 can be increased.

[0141] Other Implementation Methods

[0142] The above implementation method can also adopt the following structure.

[0143] In this embodiment, the through portion 11 of the first component 10 is provided as a circular through hole. During arc welding, the third component 30, which serves as filler metal, is fed into the through portion 11 while the welding point, which is the welding location, is stopped. However, this method is not limited to this.

[0144] For example, such as Figure 14 As shown, the through portion 11 of the first component 10 can also be a rectangular through hole. During arc welding, while the welding point moves from one end of the through portion 11 to the other end along its length, the third component 30, which serves as filler metal, is fed into the through portion 11.

[0145] Here, the length of the short side in the through-hole 11 is preferably 7 mm or more. This makes it easier to insert the third component 30, which serves as filler metal, through the through-hole 11. Furthermore, it increases the contact area between the second component 20 and the third component 30, ensuring the strength of the connection.

[0146] Industrial practicality

[0147] In summary, the present invention can achieve a highly practical effect of suppressing electrolytic erosion in the overlapping portions of the first, second, and third components, and is therefore extremely useful and has high industrial applicability.

[0148] Symbol Explanation

[0149] 10 First Component

[0150] 11. Penetrating section

[0151] 15 Coatings

[0152] 15a First plating layer

[0153] 15b Second coating

[0154] 20 Second Component

[0155] 21 recess

[0156] 30 Third Component

[0157] 31. Stacked Parts

[0158] 32 First joint

[0159] 33 Second joint

Claims

1. A joining structure comprising a first component, a second component, and a third component joined together, wherein the first component is made of a metallic material, the second component is made of a material difficult to weld to the first component and is stacked on the first component, and the third component is made of a filler metal of the same type as the second component, characterized in that: The surface of the first component is provided with a plating layer made of the same type of material as the second component. The coating includes a first coating and a second coating. The first coating is disposed on the surface of the first component facing the second component, and the second coating is disposed on the surface of the first component opposite to the first coating. The first component is provided with a through portion that extends through the stacking direction. The third component has a stacked portion, a first joint portion, and a second joint portion. The laminated portion solidifies inside the through portion and extends in the lamination direction. The first joining portion is integrally formed with the laminated portion, and the first joining portion is joined with the first plating layer and the second component. The second joining portion is integrally formed with the laminated portion, and the second joining portion is joined with the second plating layer.

2. The joining structure according to claim 1, characterized in that: In the second component, a recessed portion is provided at a position corresponding to the through portion in the stacking direction. When viewed from the stacking direction, the periphery of the recess is located on the outer side of the periphery of the through portion.

3. The joining structure according to claim 2, characterized in that: The distance between the periphery of the recess and the periphery of the through portion is at least 0.5 mm.

4. The joining structure according to any one of claims 1 to 3, characterized in that: The through portion is formed in a circular shape. The diameter of the through-hole is φ7mm or more.

5. The joining structure according to any one of claims 1 to 3, characterized in that: The through portion is rectangular in shape. The length of the short side of the through portion is 7mm or more.

6. The joining structure according to any one of claims 1 to 3, characterized in that: The second component and the plating are made of copper or aluminum.

7. The joining structure according to any one of claims 1 to 3, characterized in that: The peripheral portion of the through section is formed into a curved shape in the stacking direction.

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