Welded structure

Abstract

The present invention obtains a welded structure capable of suppressing the occurrence of cracks on the root side of a welded portion subjected to arc welding. In the welded structure, the first member is provided with a protrusion protruding from the first end surface, and the protrusion is provided with a first surface formed so as to be continuous with the first end surface and to intersect the first end surface. The second member is disposed such that the second end surface thereof faces the first end surface of the first member, the second surface is formed so as to face the first surface of the first member and to be continuous with the second end surface, and an overlapping portion having the second surface overlaps the first surface side of the convex portion. The first end face of the first member and the second end face of the second member are joined together by arc welding at the first welding portion. Further, in the vicinity of the first welded portion, the overlapping portion and the first surface side of the convex portion are joined together by welding at the second welded portion.

Description

Technical Field

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

[0002] Patent Document 1 discloses a welding-related technique. In this prior art, a bevel (either a L-shaped or J-shaped groove) is formed on the edge of a reinforcement abutting against a steel plate, and laser welding is performed at the root of the L-shaped or J-shaped groove. Subsequently, arc welding is performed on the enlarged portion of the L-shaped or J-shaped groove to fill it with weld metal. In this prior art, by performing laser welding at the root, the generation of penetration or molten residue is eliminated, thereby reducing the degree of cracking.

[0003] Prior art literature

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2006-224137 Summary of the Invention

[0006] The problem to be solved by the invention

[0007] However, since the aforementioned existing technology is a laser welding technique performed at the root, it cannot be applied to situations where arc welding is performed at the root.

[0008] The present invention takes into account the above facts and aims to obtain a welded structure capable of suppressing cracking at the root side of the welded portion where arc welding has been performed.

[0009] Methods for solving problems

[0010] The first type of welded structure includes: a first component having a protrusion protruding from a first end face, which is a predetermined end face, the protrusion having a first surface formed in a manner continuous with and intersecting the first end face; a second component having a second end face and an overlapping portion, the second end face being disposed opposite to the first end face of the first component, the overlapping portion having a second surface formed in a manner facing the first surface of the first component and continuous with the second end face, and the overlapping portion overlapping the first surface side of the protrusion; a first weld portion being a portion where the first end face and the second end face are joined by arc welding; and a second weld portion being a portion where the overlapping portion is joined to the first surface side of the protrusion by welding near the first weld portion.

[0011] In addition, the concept of "overlapping with the first surface side of the protrusion" includes not only the case of overlapping with the first surface side of the protrusion in a contact state, but also the case of overlapping with the first surface side of the protrusion with a gap between them.

[0012] According to the welded structure of the first embodiment, a first component has a protrusion protruding from a first end face, which is a predetermined end face. This protrusion has a first surface formed in a manner continuous with and intersecting the first end face. Furthermore, a second component is disposed with its second end face facing the first end face of the first component, and the second surface is formed facing the first surface of the first component and continuous with the second end face. The overlapping portion of the second surface overlaps with the first surface side of the protrusion. The first end face of the first component and the second end face of the second component are joined together at a first weld joint by arc welding. Further, near the first weld joint, the overlapping portion and the first surface side of the protrusion are joined together at the second weld joint by welding. In this manner, since the area near the first weld joint is strengthened by utilizing the second weld joint, the stress generated at the first weld joint is reduced, thereby suppressing cracking on the second end face side (i.e., the root side) of the first weld joint.

[0013] The second type of welded structure is, in the first type of welded structure, in the overlapping portion, a hole is formed through the first welded portion, and the second welded portion is set as a portion of the inner surface of the hole containing the overlapping portion that becomes the opposite side of the second end face and is joined to the first surface side of the protrusion by arc welding.

[0014] According to the welded structure of the second embodiment, a hole is formed through the overlapping portion near the first weld portion, and a portion of the inner surface of the hole, which is the opposite side of the second end face, is joined to the first surface side of the protrusion at the second weld portion by arc welding. Therefore, since the portion of the overlapping portion from the second end face to the inner surface of the hole, which is the opposite side of the second end face, is joined to the first component on both sides by the first and second weld portions, stress generated on the second end face side of the first weld portion can be effectively suppressed.

[0015] The third type of welded structure is, in the first or second type of welded structure, wherein the second component has an insertion portion for the insertion portion to be inserted into the protrusion of the first component and the second surface is a structural portion, the first surface of the first component is formed in a plurality of forms on the outer peripheral surface of the protrusion, the second surface of the second component is formed in a plurality of forms corresponding to the plurality of first surfaces, and the second welding portion is formed in a manner that each of the plurality of overlapping portions is respectively joined to the first surface side of the corresponding protrusion.

[0016] According to the third-party welded structure, the second component has an insertion portion with a second surface as its structural part, and a protrusion of the first component is inserted into the insertion portion of the second component. Furthermore, multiple first surfaces of the first component are formed on the outer peripheral surface of the protrusion, and multiple second surfaces of the second component are formed corresponding to the multiple first surfaces. The second weld portion is formed such that each of the multiple overlapping portions is joined to the first surface side of the corresponding protrusion. Therefore, in the structure where the protrusion of the first component is inserted into the insertion portion of the second component, cracking on the second end face side of the first weld portion can be suppressed.

[0017] The fourth type of welded structure is, in any one of the first to third types of welded structures, the second welded portion is, the portion where the overlapping portion and the first surface side of the protrusion are joined linearly along the first welded portion by welding.

[0018] In addition, the concept of "being joined in a linear manner" includes not only the case of being joined in a straight line, but also the case of being joined in a curved manner. Furthermore, it also includes, for example, the case of being joined in a linear manner by arranging multiple spot welds in a continuous manner without spacing.

[0019] According to the fourth type of welded structure, since the second welded part becomes the part in which the overlapping part and the first side of the protrusion are joined linearly along the first welded part by welding, the vicinity of the first welded part is more effectively strengthened by the second welded part.

[0020] Invention Effects

[0021] As explained above, the welded structure according to the present invention has an excellent effect of suppressing cracking at the root side of the weld where arc welding has been performed. Attached Figure Description

[0022] Figure 1 This is a perspective view showing a portion of the welded structure according to the first embodiment of the present invention.

[0023] Figure 2To represent it as a section cut along line 2-2 and magnified. Figure 1 A cross-sectional view of the upper part of the welded structure.

[0024] Figure 3 To decompose and represent the components in their state before welding Figure 1 An exploded perspective view of the components of a welded structure.

[0025] Figure 4 This is a cross-sectional view showing a portion of the welded structure according to the second embodiment of the present invention.

[0026] Figure 5 This is a perspective view showing a portion of the welded structure according to the third embodiment of the present invention.

[0027] Figure 6 This is a perspective view showing a portion of the welded structure according to the fourth embodiment of the present invention. Detailed Implementation

[0028] [First Implementation Method]

[0029] use Figures 1 to 3 The welded structure according to the first embodiment of the present invention will now be described.

[0030] (structure)

[0031] exist Figure 1 A portion of the welded structure 10 according to the first embodiment is shown in the perspective view. Figure 2 The text shows along Figure 1 Use line 2-2 to cut and enlarge Figure 1 A cross-sectional view of the upper part of the welded structure 10 shown. Furthermore, in Figure 3 The diagram shows the disassembly of the welded structure 10 in its pre-welding state (see reference). Figure 1 The exploded perspective view of the components, namely the first component 20 and the second component 30. Additionally, Figure 1 The welded structure 10 shown is, for example, a structure for the vehicle frame.

[0032] Figure 3 Both the first component 20 and the second component 30 shown are made of metal (for example, they are made of aluminum alloy). Furthermore, the first component 20 is, for example, made of cast material, and the second component 30 is, for example, made of extruded material.

[0033] The first component 20 is, for example, formed in a generally rectangular cylindrical shape and has a protrusion 24 protruding from a first end face 22, which is a predetermined end face. The first end face 22 is formed in a rectangular frame shape, and the protrusion 24, for example, protrudes in the direction facing the first end face 22 and is formed in a square cylindrical shape. The protrusion 24 has a first surface 24A formed in a manner that is continuous with and intersects (for example, orthogonal) the first end face 22, and multiple (for example, four) first surfaces 24A are formed on the outer peripheral surface of the protrusion 24.

[0034] The second component 30 is formed as an example in a generally rectangular cylindrical shape, and has a second end face 32 disposed opposite to the first end face 22 of the first component 20 at its end side in the direction of the cylindrical axis, and has an insertion portion 34 into which the protrusion 24 of the first component 20 is inserted. The intersection of the outer surface 31 of the second component 30 and the second end face 32, i.e., the top edge 30L, is rectangular in shape.

[0035] Inserted part 34 with Figure 2 The second surface 36A opposite the first surface 24A of the first component 20 shown is a structural part. The second surface 36A is formed continuously with the second end surface 32, and is connected to the plurality of first surfaces 24A of the first component 20 (see reference). Figure 1 as well as Figure 3 Correspondingly, multiple portions are formed (four for example). The overlapping portion 36 having the second surface 36A overlaps with the first surface 24A side of the protrusion 24. The overlapping portion 36 is aligned with... Figure 1 The protrusion 24 shown is provided in a manner corresponding to the multiple first surfaces 24A (four for example).

[0036] like Figure 1 As shown, an elongated hole 36H, serving as a slot, is formed through the overlapping portion 36. The elongated hole 36H is formed near the top edge 30L of the second component 30, with its long side extending along the direction of the top edge 30L, and is elongated, and for example, rectangular. One elongated hole 36H is formed on each of the plurality of overlapping portions 36, for a total of four (see reference). Figure 3 ).

[0037] like Figure 2 As shown, the welded structure 10 has a first welded portion 40, which is the portion where a first end face 22 and a second end face 32 are joined by arc welding. The first welded portion 40 spans... Figure 1 The welded structure 10 shown is formed around its entire circumference. The aforementioned elongated hole 36H is formed near the first welded portion 40.

[0038] In addition, such as Figure 2 As shown, the welded structure 10 has a second welded portion 42, which is a portion where the overlapping portion 36 and the first surface 24A side of the protrusion 24 are joined by welding near the first welded portion 40. Furthermore, "near the first welded portion 40" means, for example, a distance from the first welded portion 40 equal to the weld width of the first welded portion 40 (within...). Figure 2 The width of the second weld portion 42 is within a few times the width of the first weld portion 40 in the left-right direction. The second weld portion 42 is configured such that the portion of the inner surface of the elongated hole portion 36H containing the overlapping portion 36, which is the opposite side of the second end face 32, is joined to the first surface 24A side of the protrusion 24 by arc welding. In addition, in this embodiment, as an example, the second weld portion 42 is not present on the end side (left side in the figure) of the elongated hole portion 36H of the overlapping portion 36, which is opposite to the side of the first weld portion 40.

[0039] like Figure 1 As shown, the second welding portion 42 joins the overlapping portion 36 to the first surface 24A side of the protrusion 24 in a linear (more specifically, straight) manner along the first welding portion 40. The second welding portion 42 is formed in multiple ways (at four locations) such that each of the multiple overlapping portions 36 is joined to the first surface 24A side of the corresponding protrusion 24.

[0040] (Functions and Effects)

[0041] Next, the function and effects of the first embodiment will be explained.

[0042] In this embodiment, such as Figure 2As shown, the first component 20 has a protrusion 24 protruding from a first end face 22, which is a predetermined end face. The protrusion 24 of the first component 20 has a first surface 24A formed in a manner that is continuous with and intersects the first end face 22. Furthermore, the second component 30 is arranged with its second end face 32 facing the first end face 22 of the first component 20, and a second surface 36A is formed facing the first surface 24A of the first component 20 and continuous with the second end face 32. The overlapping portion 36 having the second surface 36A overlaps with the first surface 24A side of the protrusion 24. The first end face 22 of the first component 20 and the second end face 32 of the second component 30 are joined together at a first weld portion 40 by arc welding. Further, near the first weld portion 40, the overlapping portion 36 and the first surface 24A side of the protrusion 24 are joined together at the second weld portion 42 by welding. In this way, by using the second weld portion 42 to strengthen the vicinity of the first weld portion 40, the stress generated at the first weld portion 40 is reduced, thus suppressing cracking on the second end face 32 side (i.e., the root side) of the first weld portion 40. In other words, the bonding strength of the overlapping portion 36 relative to external forces is improved.

[0043] In this embodiment, as Figure 1 As shown, since the second weld portion 42 is the part in which the overlapping portion 36 and the first surface 24A side of the protrusion 24 are joined linearly along the first weld portion 40 by welding, the vicinity of the first weld portion 40 is more effectively strengthened by the second weld portion 42.

[0044] Furthermore, in this embodiment, an elongated hole 36H is formed through the overlapping portion 36 near the first weld portion 40, such as... Figure 2 As shown, the portion of the inner surface of the elongated hole portion 36H, which includes the overlapping portion 36, that is the opposite side of the second end face 32, is joined to the first surface 24A side of the protrusion 24 at the second weld portion 42 by arc welding. Therefore, since the portion of the overlapping portion 36 from the second end face 32 to the surface 36B, which is the opposite side of the second end face 32, on the inner surface of the elongated hole portion 36H, is joined to the first component 20 on both sides by the first weld portion 40 and the second weld portion 42, stress generated on the second end face 32 side of the first weld portion 40 can be effectively suppressed.

[0045] Furthermore, in this embodiment, the second component 30 includes an insertion portion 34 with the second surface 36A as its structural portion (see reference). Figure 3 ),exist Figure 3 The protrusion 24 of the first component 20 is inserted into the insertion portion 34 of the second component 30 shown. Furthermore, as... Figure 1As shown, the first surface 24A of the first component 20 is formed with a plurality of surfaces on the outer peripheral surface of the protrusion 24, and the second surface 36A of the second component 30 (see reference) Figure 2 Multiple overlapping portions 36 are formed in a manner corresponding to multiple first surfaces 24A, and the second welding portion 42 joins each of the multiple overlapping portions 36 to the first surface 24A side of the corresponding protrusion 24. Therefore, the protrusion 24 of the first component 20 is inserted into the insertion portion 34 of the second component 30 (see reference). Figure 3 In the structure (socket structure) of the first weld 40, cracking at the second end face 32 side can be suppressed.

[0046] As explained above, the welded structure 10 according to the first embodiment can suppress the occurrence of cracks on the second end face 32 (root) side of the first welded portion 40 to which arc welding has been performed.

[0047] [Second Implementation]

[0048] Next, use Figure 4 The welded structure according to the second embodiment of the present invention will now be described. Figure 4 In the middle, a cross-sectional view (corresponding to the first embodiment) is shown. Figure 2 The cross-sectional view shows a portion of the welded structure 50 according to the second embodiment.

[0049] like Figure 4 As shown, the welded structure 50 according to the second embodiment differs from the welded structure 10 according to the first embodiment (see reference 10) in the following aspects. Figures 1 to 3 The difference is that it does not form a through-hole 36H (refer to...). Figures 1 to 3 ), and replace the second welded part 42 (see reference) Figure 1 as well as Figure 2 The second welding part 54 is provided. Other structures of the welded structure 50 according to the second embodiment are similar to those of the welded structure 10 according to the first embodiment (see reference). Figures 1 to 3 The structures are substantially the same as those in the first embodiment. Therefore, in the second embodiment, the same symbols will be used to mark structural parts that are substantially the same as those in the first embodiment, and the descriptions will be omitted.

[0050] The second component 52 in the second embodiment is configured such that it does not form a through-hole 36H (see reference). Figures 1 to 3 Apart from this point, everything else is the same as the second component 30 of the first embodiment (see reference 30). Figures 1 to 3 The structure is essentially the same as that of the second component 52. Therefore, regarding the second component 30 of the first embodiment (see reference 1), Figures 1 to 3 For structural parts that are essentially the same, the same symbols are used for convenience and the explanation is omitted.

[0051] The welded structure 50 according to the second embodiment has a second welded portion 54, which is a portion where the overlapping portion 36 and the first surface 24A side of the protrusion 24 are joined by arc welding near the first welded portion 40. Although the figure is omitted, as an example, the second welded portion 54 and the second welded portion 42 of the first embodiment (see reference) Figure 1 Similarly, the overlapping portion 36 and the first surface 24A side of the protrusion 24 are joined together in a straight line (generally speaking, in a linear fashion) along the first welding portion 40. In addition, the position, extension direction and length of the second welding portion 54 can be appropriately set.

[0052] Even according to the second embodiment described above, cracking on the second end face 32 (root) side of the first weld portion 40 to which arc welding has been performed can be suppressed. Furthermore, in the second embodiment, since the second weld portion 54 is not formed in a pre-formed hole, no gap is generated between it and the hole. Therefore, compared to the first embodiment, the joint portion between the overlapping portion 36 and the first surface 24A side of the protrusion 24 is increased, thereby effectively suppressing cracking on both the second end face 32 side and the first end face 22 side of the first weld portion 40.

[0053] [Third Implementation Method]

[0054] Next, use Figure 5 The welded structure according to the third embodiment of the present invention will now be described. Figure 5 In the middle, a three-dimensional diagram (equivalent to the first embodiment) is used. Figure 1 The perspective view shows a portion of the welded structure 60 according to the third embodiment.

[0055] like Figure 5 As shown, the welded structure 60 according to the third embodiment differs from the welded structure 10 according to the first embodiment (see reference 10) in the following aspects. Figures 1 to 3 The difference is that it does not form a through-hole 36H (refer to...). Figures 1 to 3 ), and replace the second welded part 42 (see reference) Figure 1 as well as Figure 2 The second weld portion 64 is curved. Other structures of the welded structure 60 according to the third embodiment are similar to those of the welded structure 10 according to the first embodiment (see reference). Figures 1 to 3 The structures are substantially the same as those in the first embodiment. Therefore, in the third embodiment, the same symbols will be used to mark structural parts that are substantially the same as those in the first embodiment, and the descriptions will be omitted.

[0056] The second component 62 in the third embodiment is configured such that it does not form a through-hole 36H (see reference). Figures 1 to 3 Apart from this point, everything else is the same as the second component 30 of the first embodiment (see reference 30). Figures 1 to 3 The structure is essentially the same as that of the second component 62. Therefore, regarding the second component 30 of the first embodiment (see reference 1), Figures 1 to 3 For structural parts that are essentially the same, the same symbols are used for convenience and the explanation is omitted.

[0057] The welded structure 60 according to the third embodiment has a second welded portion 64, which is a portion where the overlapping portion 36 and the first surface 24A side of the protrusion 24 are joined together by arc welding near the first welded portion 40. The second welded portion 64 joins the overlapping portion 36 and the first surface 24A side of the protrusion 24 together in a curved (generally linear) shape along the first welded portion 40. In addition, the position, curve shape, and length of the second welded portion 64 can be appropriately set.

[0058] Even according to the third embodiment described above, the same function and effect as the second embodiment described above can be obtained.

[0059] [Fourth Implementation Method]

[0060] Next, use Figure 6 The welded structure according to the fourth embodiment of the present invention will now be described. Figure 6 In the middle, a three-dimensional diagram (equivalent to the first embodiment) is used. Figure 1 The perspective view shows a portion of the welded structure 70 according to the fourth embodiment.

[0061] like Figure 6 As shown, the welded structure 70 according to the fourth embodiment differs from the welded structure 10 according to the first embodiment (see reference 10) in the following aspects. Figures 1 to 3 The difference is that it does not form a through-hole 36H (refer to...). Figures 1 to 3 ), and replace the second welded part 42 (see reference) Figure 1 as well as Figure 2 The second welding part 74 is provided. Other structures of the welded structure 70 according to the fourth embodiment are similar to those of the welded structure 10 according to the first embodiment (see reference). Figures 1 to 3 The structures are substantially the same as those in the first embodiment. Therefore, in the fourth embodiment, the same symbols will be used to mark structural parts that are substantially the same as those in the first embodiment, and the descriptions will be omitted.

[0062] The second component 72 in the fourth embodiment is configured such that it does not form a through-hole 36H (see reference). Figures 1 to 3Apart from this point, everything else is the same as the second component 30 of the first embodiment (see reference 30). Figures 1 to 3 The structure is essentially the same as that of the second component 72. Therefore, regarding the second component 30 of the first embodiment (see reference 1), Figures 1 to 3 For structural parts that are essentially the same, the same symbols are used for convenience and the explanation is omitted.

[0063] The welded structure 70 according to the fourth embodiment has a second welded portion 74, which is a portion in which the overlapping portion 36 and the first surface 24A side of the protrusion 24 near the first welded portion 40 are joined in a linear (curved) manner by means of laser welding (e.g., LSW (Laser Screw Welding) or ALW (Atomized Laser Screw Welding)) so that multiple points are arranged continuously without spacing.

[0064] Even according to the fourth embodiment described above, it is possible to suppress the second end face (not shown in the figure) of the first welded portion 40 where arc welding was performed. Figure 2 as well as Figure 3 The second end face 32 (the same end face) is cracked. Furthermore, since the second welded portion 74 is formed by laser welding, it is similar to... Figure 1 , Figure 2 , Figure 4 as well as Figure 5 Compared to the case where the second weld portions 42, 54, and 64 are formed by arc welding as shown, welding reinforcement can be performed at a higher speed. Furthermore, the position of the second weld portion 74, the shape formed by the continuous points, and the length can be appropriately set.

[0065] [Supplementary Explanation of Implementation Methods]

[0066] Although Figures 1 to 6 The welded structures 10, 50, 60, and 70 according to the first to fourth embodiments shown above have a structure (socket structure) in which the protrusion 24 of the first component 20 is inserted into the insertion portion 34 of the second component 30, 52, 62, and 72. However, as a variation of the above embodiments, the welded structure of the present invention may also have, for example, a structure with... Figure 2 , Figure 4 The part shown has the same structure but does not have a socket structure.

[0067] In addition, Figures 1 to 6In the first to fourth embodiments shown above, although the first component 20 is formed as a generally square tube shape as an example and the protrusion 24 of the first component 20 is formed as a square tube shape, as a variation of the above embodiments, the first component having the protrusion may also be a solid component.

[0068] In addition, although Figures 1 to 6 In the first to fourth embodiments shown above, the first weld portion 40 is formed across the entire circumference of the square cylindrical welded structures 10, 50, 60, and 70 (all around when viewed axially from the welded structure). However, as a variation of the above embodiments, the first weld portion may also be formed on one, two, or three of the upper, lower, left, and right portions of the square cylindrical welded structures (10, 50, 60, and 70) when viewed axially from the welded structure. The formation position of the first weld portion is not limited to the case in the above embodiments. Furthermore, when the first weld portion is formed on one, two, or three of the upper, lower, left, and right portions of the square cylindrical welded structures (10, 50, 60, and 70) when viewed axially from the welded structure, the side of the upper, lower, left, and right portions where the first weld portion is not formed may not be joined, or welding structures such as spot welding, lap welding, and butt welding may be applied.

[0069] Furthermore, although the first component 20 is set as a casting material as an example in the above embodiment, as a variation of the above embodiment, the first component may also adopt a structure other than a casting material, such as a die-casting material or an extruded material. Furthermore, although the first component 20 is formed as a generally cylindrical shape as an example in the above embodiment, as a variation of the above embodiment, the first component may be formed in a shape other than a generally cylindrical shape, such as being formed as a tube (cylindrical) or a plate.

[0070] Furthermore, although in the above embodiment, the second components 30, 52, 62, and 72 are provided as an example of extruded material, as a variation of the above embodiment, the second components may also adopt a structure other than extruded material, such as casting material or die-casting material. Furthermore, although in the above embodiment, the second components 30, 52, 62, and 72 are formed in a generally cylindrical shape as an example, as a variation of the above embodiment, the second components may be formed in a shape other than generally cylindrical, such as being formed as a tube (cylindrical) or plate.

[0071] Furthermore, although in the above embodiment, the first component 20 and the second components 30, 52, 62, and 72 are all made of aluminum alloy as an example, the first component and the second component may also be made of metal other than aluminum alloy, such as steel.

[0072] Furthermore, although in the above embodiment the first end face 22 and the second end face 32 are provided as planar end faces, the first end face and the second end face can also be curved end faces. To elaborate further, although... Figure 3 The first end face 22 and the second end face 32 shown appear straight when viewed along the thickness direction of the plate (e.g., when viewed from above), but the first end face (22) and the second end face (32) can also appear, for example, meandering when viewed along the thickness direction of the plate. Furthermore, although Figure 2 The first end face 22 and the second end face 32 shown are along Figure 2 The diagram is formed in the vertical direction, but for example, it can be formed on the first end face (22) as it tends toward the first face (24A) side (in Figure 2 The middle side (lower side in the figure) is inclined in a way that approaches the second end face (32), or the second end face (32) is inclined towards the first face (24A) side (in Figure 2 The middle part is the lower side in the figure) and it is inclined in a way that is close to the first end face (22).

[0073] Furthermore, as a variation of the third embodiment described above (see Figure (5)), a structure may also be adopted in which a curved hole is formed through the overlapping portion (36) of the second component (62) near the first weld portion (40), and the second weld portion is a portion in which the side of the inner surface of the hole containing the overlapping portion (36) that becomes the opposite side of the second end face is joined to the first surface (24A) side of the protrusion (24) by arc welding.

[0074] Furthermore, as described in the fourth embodiment above (refer to...), Figure 6 In a variation of the first weld (40), the second welded part can also be a part in which the overlapping part (36) and the first surface (24A) side of the protrusion (24) are joined together by laser welding (e.g., LSW, ALW) so that multiple points are arranged slightly spaced apart.

[0075] Furthermore, the above-described embodiments and their various modifications can be appropriately combined for implementation.

[0076] Although an example of the invention has been described above, the invention is not limited to the above description, and it is obvious that various modifications can be made without departing from its spirit.

[0077] Symbol Explanation

[0078] 10. Welded structures;

[0079] 20. First component;

[0080] 22. First end face;

[0081] 24. Convex part;

[0082] 24A, First Page;

[0083] 30. Second component;

[0084] 32. Second end face;

[0085] 34. The part to be inserted;

[0086] 36. Overlapping parts;

[0087] 36A, Second page;

[0088] 36B. The face that becomes the opposite face of the second end face;

[0089] 36H, elongated hole section (hole section);

[0090] 40. First welding section;

[0091] 42. Second welding section;

[0092] 50. Welded structures;

[0093] 52. Second component;

[0094] 54. Second welding section;

[0095] 60. Welded structures;

[0096] 62. Second component 62;

[0097] 64. Second welding section;

[0098] 70. Welded structures;

[0099] 72. Second component;

[0100] 74. Second welding section.

Claims

1. A welded structure, comprising: A first component has a protrusion protruding from a first end face which is a predetermined end face, the protrusion having a first surface formed in a manner that is continuous with and intersects the first end face. The second component has a second end face and an overlapping portion. The second end face is configured to face the first end face of the first component. The overlapping portion has a second surface formed to face the first surface of the first component and to be continuous with the second end face. The overlapping portion overlaps with the first surface side of the protrusion. The first welded portion is the portion where the first end face and the second end face are joined by arc welding; The second weld portion is the portion where the overlapping portion and the first surface side of the protrusion are joined by welding near the first weld portion.

2. The welded structure as described in claim 1, wherein, A hole is formed through the overlapping portion near the first weld portion. The second weld portion is configured such that a portion of the inner surface of the hole containing the overlapping portion, which is the opposite side of the second end face, is joined to the first surface side of the protrusion by arc welding.

3. The welded structure as described in claim 1, wherein, The second component has an insertion portion into which the protrusion of the first component is inserted, and the second surface is a structural part. The first component has multiple first surfaces formed on the outer peripheral surface of the protrusion, and the second component has multiple second surfaces corresponding to the multiple first surfaces. The second weld portion is formed in such a way that each of the plurality of overlapping portions and the first face side of the corresponding protrusion are respectively joined together.

4. The welded structure as described in claim 1, wherein, The second welded portion is the portion where the overlapping portion and the first surface side of the protrusion are joined linearly along the first welded portion by welding.

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