Welded structure

Abstract

To obtain a welded structure capable of suppressing the occurrence of cracks on the root part side of a weld zone subjected to arc welding.SOLUTION: First member 20 includes protrusion 24 protruding from first end surface 22, and protrusion 24 includes first surface 24A formed so as to be continuous with first end surface 22 and intersect with first end surface 22. The second member 30 is arranged so that the second end face 32 faces the first end face 22 of the first member 20, the second face side 36A faces the first face side 24A of the first member 20 and is formed continuously with the second end face 32, and an overlapping part 36 having the second face side 36A is overlapped on the first face side 24A side of the projecting part 24. The first end surface 22 of the first member 20 and the second end surface 32 of the second member 30 are joined by arc welding at a first welded portion 40. Further, in the vicinity of the first welded portion 40, the overlapped portion 36 and the 24A side of the first surface of the convex portion 24 are welded and joined to each other at a second welded portion 42.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a welded structure. [Background technology]

[0002] Patent Document 1 listed below discloses a technology related to welding. Briefly, in this prior art, a square or J-shaped groove is formed at the edge of a stiffener that contacts a steel plate, laser welding is performed at the root of the square or J-shaped groove, and then arc welding is performed at the expanded portion of the square or J-shaped groove to fill the weld metal. In this prior art, laser welding at the root eliminates the occurrence of melt-through and unmelted areas and reduces the occurrence of cracks. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-224137 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned prior art is directed to performing laser welding on the root portion, and therefore cannot be applied to a case where arc welding is performed on the root portion.

[0005] In consideration of the above, an object of the present invention is to provide a welded structure that can suppress the occurrence of cracks on the root side of an arc-welded weld. [Means for solving the problem]

[0006] A first aspect of the welded structure includes a first member having a convex portion protruding from a first end face, which is a predetermined end face, the convex portion having a first surface formed to be continuous with and intersect with the first end face; a second member having a second end face arranged to face the first end face of the first member; and an overlapping portion having a second surface formed to face the first face of the first member and continuous with the second end face, the second surface overlapping the first surface side of the convex portion; a first welded portion which is a portion where the first end face and the second end face are joined by arc welding; and a second welded portion which is a portion where the overlapping portion and the first surface side of the convex portion are joined by welding near the first welded portion.

[0007] The concept of "overlapped on the first surface side of the convex portion" includes not only the case where it is overlaid on the first surface side of the convex portion in a contacting state, but also the case where it is overlaid on the first surface side of the convex portion with a gap therebetween.

[0008] According to a first aspect of the welded structure, the first member has a protrusion protruding from a first end face, which is a predetermined end face. The protrusion of the first member has a first surface that is continuous with and intersects the first end face. The second member is disposed so that its second end face faces the first end face of the first member, and its second surface faces the first face of the first member and is continuous with the second end face. An overlapping portion having the second surface overlaps the first face side of the protrusion. The first end face of the first member and the second end face of the second member are joined by arc welding at a first weld. Furthermore, the overlapping portion and the first face side of the protrusion are joined by welding at a second weld near the first weld. In this way, the vicinity of the first weld is reinforced by the second weld, thereby reducing stress generated at the first weld, making it possible to suppress cracks from occurring on the second end face side (i.e., the root side) of the first weld.

[0009] The second aspect of the welded structure is the welded structure of the first aspect, wherein a hole is formed through the overlapping portion near the first welded portion, and the second welded portion is a portion of the inner surface of the hole in the overlapping portion that includes a surface opposite the second end surface and the first surface side of the convex portion joined by arc welding.

[0010] According to the second aspect of the welded structure, a hole is formed through the overlapping portion near the first weld, and a portion of the inner surface of the hole in the overlapping portion that includes a surface opposite the second end face is joined to the first surface side of the convex portion by arc welding at the second weld. As a result, the portion of the overlapping portion from the second end face to the surface of the inner surface of the hole opposite the second end face is joined to the first member on both sides by the first weld and the second weld, so that stress generated on the second end face side of the first weld can be effectively suppressed.

[0011] The third aspect of the welded structure is a welded structure of the first or second aspect, wherein the second member has an inserted portion into which the convex portion of the first member is inserted and which constitutes the second surface, the first surfaces of the first member are formed in multiple locations on the outer peripheral surface of the convex portion, the second surfaces of the second member are formed in multiple locations corresponding to the multiple first surfaces, and the second welded portion is formed to join each of the multiple overlapping portions to the first surface side of the corresponding convex portion.

[0012] According to a third aspect of the welded structure, the second member has an inserted portion having the second surface as a constituent part, and the convex portion of the first member is inserted into the inserted portion of the second member. Furthermore, a plurality of first surfaces of the first member are formed on the outer peripheral surface of the convex portion, a plurality of second surfaces of the second member are formed corresponding to the plurality of first surfaces, and the second welded portion is formed to join each of the plurality of overlapping portions to the corresponding first surface side of the convex portion. Therefore, in a configuration in which the convex portion of the first member is inserted into the inserted portion of the second member, it is possible to suppress the occurrence of cracks on the second end surface side of the first welded portion.

[0013] A welded structure of a fourth aspect is a welded structure of any one of the first to third aspects, wherein the second welded portion is a portion where the overlapping portion and the first surface side of the convex portion are linearly joined by welding along the first welded portion.

[0014] The concept of "linearly joined" includes not only straight-line joints but also curved joints, and also includes cases where multiple spot welds are joined linearly by lining up consecutively without any gaps.

[0015] According to the welded structure of the fourth aspect, the second weld is a portion where the overlap portion and the first surface side of the convex portion are linearly joined along the first weld by welding, so that the area near the first weld is more effectively reinforced by the second weld. [Effects of the Invention]

[0016] As described above, the welded structure according to the present invention has the excellent effect of being able to suppress the occurrence of cracks on the root side of an arc-welded weld. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view showing a part of a welded structure according to a first embodiment of the present invention. [Figure 2] 2 is an enlarged cross-sectional view of the upper part of the welded structure of FIG. 1 taken along line 2-2. FIG. [Figure 3] 2 is an exploded perspective view showing the members constituting the welded structure of FIG. 1 in a state before welding. FIG. [Figure 4] FIG. 4 is a cross-sectional view showing a part of a welded structure according to a second embodiment of the present invention. [Figure 5] FIG. 10 is a perspective view showing a part of a welded structure according to a third embodiment of the present invention. [Figure 6] FIG. 10 is a perspective view showing a part of a welded structure according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] [First embodiment] A welded structure according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.

[0019] (composition) Fig. 1 shows a perspective view of a portion of a welded structure 10 according to a first embodiment, and Fig. 2 shows an enlarged cross-sectional view of the upper part of the welded structure 10 shown in Fig. 1, taken along line 2-2 in Fig. 1. Fig. 3 shows an exploded perspective view of a first member 20 and a second member 30, which are components of the welded structure 10 (see Fig. 1), in a pre-welded state. The welded structure 10 shown in Fig. 1 is, for example, a structure for a vehicle frame.

[0020] 3 are both made of metal (for example, aluminum alloy). In addition, for example, the first member 20 is made of a cast material, and for example, the second member 30 is made of an extruded material.

[0021] The first member 20 is formed, for example, in a substantially rectangular cylindrical shape and includes 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 is formed, for example, in a quadrangular cylindrical shape and protruding in the direction in which the first end face 22 faces. The protrusion 24 includes a first surface 24A that is continuous with the first end face 22 and is formed to intersect with the first end face 22 (here, as an example, orthogonal to) the first end face 22, and a plurality of first surfaces 24A (four, for example) are formed on the outer peripheral surface of the protrusion 24.

[0022] The second member 30 is formed, for example, in a substantially rectangular cylindrical shape and has a second end face 32 arranged at the end side in the cylindrical axis direction so as to face the first end face 22 of the first member 20, and also has an inserted portion 34 into which the convex portion 24 of the first member 20 is inserted. A tip-side ridge 30L, which is the intersection of the outer surface 31 and the second end face 32 of the second member 30, forms a rectangular shape.

[0023] The inserted portion 34 has a second surface 36A that faces the first surface 24A of the first member 20 shown in Fig. 2. The second surface 36A is formed continuously with the second end surface 32, and a plurality of second surfaces 36A (four, for example) are formed to correspond to the plurality of first surfaces 24A (see Figs. 1 and 3) of the first member 20. The overlapping portion 36 having the second surface 36A is overlapped on the first surface 24A side of the protruding portion 24. A plurality of overlapping portions 36 (four, for example) are provided to correspond to the plurality of first surfaces 24A of the protruding portion 24 shown in Fig. 1.

[0024] As shown in Fig. 1, elongated hole portions 36H serving as holes (slots) are formed through the overlapping portions 36. The elongated hole portions 36H are formed near the tip-side ridge line 30L of the second member 30, with the direction along the tip-side ridge line 30L as the longitudinal direction, and are elongated holes having, for example, a rectangular shape. One elongated hole portion 36H is formed in each of the multiple overlapping portions 36, for a total of four elongated hole portions 36H (see Fig. 3).

[0025] 2, the welded structure 10 has a first welded portion 40, which is a portion where the first end surface 22 and the second end surface 32 are joined by arc welding. The first welded portion 40 is formed around the entire periphery of the welded structure 10 shown in FIG. 1. The aforementioned elongated hole portion 36H is formed in the vicinity of the first welded portion 40.

[0026] 2, the welded structure 10 has a second weld 42, which is a portion where the overlapping portion 36 and the first surface 24A side of the protruding portion 24 are welded together near the first weld 40. The vicinity of the first weld 40 refers to, for example, a distance from the first weld 40 within several times the weld width of the first weld 40 (the width of the first weld 40 in the left-right direction in FIG. 2). The second weld 42 is a portion where a portion of the inner surface of the elongated hole 36H of the overlapping portion 36, including a surface 36B opposite the second end surface 32, and the first surface 24A side of the protruding portion 24 are welded together by arc welding. In the present embodiment, for example, the second weld 42 is not present at the end of the elongated hole 36H of the overlapping portion 36 opposite the first weld 40 side (the left side in the figure).

[0027] 1, the second welded portion 42 joins the overlapping portion 36 and the first surface 24A of the protrusion 24 linearly (more specifically, linearly) along the first welded portion 40. A plurality of second welded portions 42 (here, four second welded portions 42) are formed so as to join each of the plurality of overlapping portions 36 and the corresponding first surface 24A of the protrusion 24.

[0028] (Actions and Effects) Next, the operation and effects of the first embodiment will be described.

[0029] In this embodiment, as shown in FIG. 2 , the first member 20 has a protrusion 24 protruding from a first end face 22, which is a predetermined end face. The protrusion 24 of the first member 20 has a first surface 24A that is continuous with and intersects with the first end face 22. The second member 30 has a second end face 32 that faces the first end face 22 of the first member 20, and a second surface 36A that faces the first surface 24A of the first member 20 and is continuous with the second end face 32. An overlapping portion 36 having the second surface 36A overlaps the first surface 24A side of the protrusion 24. The first end face 22 of the first member 20 and the second end face 32 of the second member 30 are joined by arc welding at a first weld 40. Furthermore, the overlapping portion 36 and the first surface 24A side of the protrusion 24 are joined by welding at a second weld 42 near the first weld 40. In this way, the vicinity of the first welded portion 40 is reinforced by the second welded portion 42, which reduces the stress generated at the first welded portion 40, making it possible to suppress the occurrence of cracks on the second end face 32 side (i.e., the root portion side) of the first welded portion 40. In other words, the joining strength of the overlap portion 36 against external forces is improved.

[0030] Here, in this embodiment, as shown in Figure 1, the second welded portion 42 is a portion where the overlapping portion 36 and the first surface 24A side of the convex portion 24 are linearly joined by welding along the first welded portion 40, so the area near the first welded portion 40 is more effectively reinforced by the second welded portion 42.

[0031] 2, a portion of the inner surface of the elongated hole 36H of the overlapping portion 36, including a surface 36B opposite the second end face 32, is joined to the first surface 24A side of the protruding portion 24 by arc welding at the second weld 42. As a result, the portion of the overlapping portion 36 from the second end face 32 to the surface 36B of the inner surface of the elongated hole 36H opposite the second end face 32 is joined to the first member 20 on both sides by the first weld 40 and the second weld 42, thereby effectively suppressing stress generated on the second end face 32 side of the first weld 40.

[0032] In the present embodiment, the second member 30 includes an inserted portion 34 (see FIG. 3) having the second surface 36A as a component, and the protruding portion 24 of the first member 20 is inserted into the inserted portion 34 of the second member 30 shown in FIG. 3. As shown in FIG. 1, a plurality of first surfaces 24A of the first member 20 are formed on the outer peripheral surface of the protruding portion 24, and a plurality of second surfaces 36A (see FIG. 2) of the second member 30 are formed corresponding to the plurality of first surfaces 24A, and the second welded portion 42 joins each of the plurality of overlapping portions 36 to the corresponding first surface 24A of the protruding portion 24. Therefore, in a configuration (spigot joint structure) in which the protruding portion 24 of the first member 20 is inserted into the inserted portion 34 (see FIG. 3) of the second member 30, it is possible to suppress the occurrence of cracks on the second end surface 32 side of the first welded portion 40.

[0033] As described above, according to the welded structure 10 according to the first embodiment, it is possible to suppress the occurrence of cracks on the second end surface 32 (root portion) side of the arc-welded first welded portion 40.

[0034] [Second embodiment] Next, a welded structure according to a second embodiment of the present invention will be described with reference to Fig. 4. Fig. 4 shows a cross-sectional view (corresponding to Fig. 2 of the first embodiment) of a portion of a welded structure 50 according to the second embodiment.

[0035] As shown in Fig. 4, the welded structure 50 according to the second embodiment differs from the welded structure 10 according to the first embodiment (see Figs. 1 to 3) in that the elongated hole portion 36H (see Figs. 1 to 3) is not formed through the welded structure 10 and that a second welded portion 54 is provided instead of the second welded portion 42 (see Figs. 1 and 2). The other configurations of the welded structure 50 according to the second embodiment are substantially similar to those of the welded structure 10 according to the first embodiment (see Figs. 1 to 3). Therefore, components in the second embodiment that are substantially similar to those in the first embodiment are designated by the same reference numerals, and descriptions thereof will be omitted.

[0036] The second member 52 of the second embodiment has substantially the same configuration as the second member 30 of the first embodiment (see FIGS. 1 to 3) except that the long hole portion 36H (see FIGS. 1 to 3) is not formed to penetrate through. Therefore, in the second member 52, components that are substantially the same as those of the second member 30 of the first embodiment (see FIGS. 1 to 3) are denoted by the same reference numerals and descriptions thereof will be omitted for convenience.

[0037] The welded structure 50 according to the second embodiment has a second weld 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 weld 40. Although not shown, the second weld 54, as an example, joins the overlapping portion 36 and the first surface 24A side of the protrusion 24 in a straight line (in a broad sense, linear) along the first weld 40, similar to the second weld 42 (see FIG. 1) of the first embodiment. The position, extending direction, and length of the second weld 54 can be set as appropriate.

[0038] The second embodiment described above also makes it possible to suppress cracks from occurring on the second end surface 32 (root portion) side of the arc-welded first welded portion 40. Furthermore, in the second embodiment, the second welded portion 54 is not formed in a pre-formed hole, so there is no gap between the hole and the second welded portion 54. This increases the joint area between the overlap portion 36 and the first surface 24A of the protrusion 24 compared to the first embodiment, making it possible to effectively suppress cracks on both the second end surface 32 side and the first end surface 22 side of the first welded portion 40.

[0039] [Third embodiment] Next, a welded structure according to a third embodiment of the present invention will be described with reference to Fig. 5. Fig. 5 shows a perspective view (corresponding to Fig. 1 of the first embodiment) of a portion of a welded structure 60 according to the third embodiment.

[0040] As shown in Fig. 5, a welded structure 60 according to the third embodiment differs from the welded structure 10 according to the first embodiment (see Figs. 1 to 3) in that the elongated hole portion 36H (see Figs. 1 to 3) is not formed through the welded structure 10 and that a curved second welded portion 64 is provided instead of the second welded portion 42 (see Figs. 1 and 2). The other configurations of the welded structure 60 according to the third embodiment are substantially similar to those of the welded structure 10 according to the first embodiment (see Figs. 1 to 3). Therefore, components in the third embodiment that are substantially similar to those in the first embodiment are designated by the same reference numerals, and descriptions thereof will be omitted.

[0041] The second member 62 of the third embodiment has substantially the same configuration as the second member 30 of the first embodiment (see FIGS. 1 to 3) except that the long hole portion 36H (see FIGS. 1 to 3) is not formed to penetrate through. Therefore, in the second member 62, components that are substantially the same as those of the second member 30 of the first embodiment (see FIGS. 1 to 3) are denoted by the same reference numerals and descriptions thereof will be omitted for convenience.

[0042] The welded structure 60 according to the third embodiment has a second weld 64, 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 weld 40. The second weld 64 joins the overlapping portion 36 and the first surface 24A side of the protrusion 24 in a curved shape (linear in a broad sense) along the first weld 40. The position, curved shape, and length of the second weld 64 can be set as appropriate.

[0043] The third embodiment described above also provides the same functions and effects as the second embodiment described above.

[0044] [Fourth embodiment] Next, a welded structure according to a fourth embodiment of the present invention will be described with reference to Fig. 6. Fig. 6 shows a perspective view (corresponding to Fig. 1 of the first embodiment) of a portion of a welded structure 70 according to the fourth embodiment.

[0045] As shown in Fig. 6, a welded structure 70 according to the fourth embodiment differs from the welded structure 10 according to the first embodiment (see Figs. 1 to 3) in that the elongated hole portion 36H (see Figs. 1 to 3) is not formed through the welded structure 70 and that a second welded portion 74 is provided instead of the second welded portion 42 (see Figs. 1 and 2). The other configurations of the welded structure 70 according to the fourth embodiment are substantially similar to those of the welded structure 10 according to the first embodiment (see Figs. 1 to 3). Therefore, components in the fourth embodiment that are substantially similar to those in the first embodiment are denoted by the same reference numerals, and descriptions thereof will be omitted.

[0046] The second member 72 of the fourth embodiment has substantially the same configuration as the second member 30 of the first embodiment (see FIGS. 1 to 3) except that the elongated hole portion 36H (see FIGS. 1 to 3) is not formed to penetrate through. Therefore, in the second member 72, components that are substantially the same as those of the second member 30 of the first embodiment (see FIGS. 1 to 3) are denoted by the same reference numerals and descriptions thereof will be omitted for convenience.

[0047] The welded structure 70 according to the fourth embodiment has a second weld 74, which is a linear (here, a curved line as an example) joint formed by laser welding (e.g., LSW (Laser Screw Welding), ALW (Atomized Laser Screw Welding)) the overlapping portion 36 and the first surface 24A side of the convex portion 24 near the first weld 40, with multiple points lined up in succession without any gaps.

[0048] The fourth embodiment described above also makes it possible to suppress the occurrence of cracks on the second end surface (not shown, an end surface similar to the second end surface 32 in FIGS. 2 and 3) of the arc-welded first welded portion 40. Furthermore, because the second welded portion 74 is formed by laser welding, it is possible to perform welding reinforcement at a higher speed than when the second welded portions 42, 54, 64 shown in FIGS. 1, 2, 4, and 5 are formed by arc welding. The position of the second welded portion 74 and the shape and length of the continuous points can be set as appropriate.

[0049] [Supplementary explanation of the embodiment] The welded structures 10, 50, 60, 70 according to the first to fourth embodiments shown in Figures 1 to 6 have a configuration (spigot structure) in which the convex portion 24 of the first member 20 is inserted into the inserted portion 34 of the second member 30, 52, 62, 72. However, as a variation of the above embodiments, the welded structure of the present invention may have a structure similar to the portions shown in Figures 2 and 4, but may not have a spigot structure.

[0050] Furthermore, in the first to fourth embodiments shown in Figures 1 to 6, the first member 20 is formed in an approximately rectangular cylindrical shape, for example, and the convex portion 24 of the first member 20 is formed in a square cylindrical shape, but as a variation of the above embodiments, the first member having the convex portion may be a solid member.

[0051] 1 to 6, the first weld 40 is formed around the entire circumference of the rectangular tubular welded structure 10, 50, 60, 70 (on all sides, top, bottom, left, and right, as viewed in the axial direction of the welded structure). However, as a modification of the above embodiments, the first weld may be formed, for example, on one, two, or three of the upper, lower, left, and right portions of the rectangular tubular welded structure (10, 50, 60, 70) as viewed in the axial direction of the welded structure. The location of the first weld is not limited to the above embodiments. When the first weld is formed on one, two, or three of the upper, lower, left, and right portions of the rectangular tubular welded structure (10, 50, 60, 70) as viewed in the axial direction of the welded structure, the upper, lower, left, and right portions of the welded structure on which the first weld is not formed may not be joined, and a welding structure such as spot welding, lap welding, or butt welding may be applied.

[0052] Furthermore, in the above embodiment, the first member 20 is made of a cast material, for example, but as a modification of the above embodiment, the first member may be made of a material other than a cast material, such as a die-cast material or an extruded material. Furthermore, in the above embodiment, the first member 20 is formed in a substantially rectangular cylindrical shape, for example, but as a modification of the above embodiment, the first member may be formed in a shape other than a substantially rectangular cylindrical shape, such as a pipe shape (cylindrical shape) or a plate shape.

[0053] Furthermore, in the above-described embodiments, the second members 30, 52, 62, and 72 are, for example, extruded materials, but as a modification of the above-described embodiments, the second members may be configured to be other than extruded materials, such as cast materials, die-cast materials, etc. Furthermore, in the above-described embodiments, the second members 30, 52, 62, and 72 are, for example, formed in a substantially rectangular cylindrical shape, but as a modification of the above-described embodiments, the second members may be formed in a shape other than a substantially rectangular cylindrical shape, such as a pipe shape (cylindrical shape) or a plate shape.

[0054] Furthermore, in the above embodiment, the first member 20 and the second members 30, 52, 62, 72 are all made of an aluminum alloy, for example, but the first member and the second member may also be made of a metal other than an aluminum alloy, such as steel.

[0055] In the above embodiment, the first end surface 22 and the second end surface 32 are flat end surfaces, but the first end surface and the second end surface may be curved end surfaces. As a supplementary explanation, the first end surface 22 and the second end surface 32 shown in FIG. 3 are linear when viewed in the thickness direction (e.g., when viewed from above). However, the first end surface 22 and the second end surface 32 may have a meandering shape when viewed in the thickness direction. The first end surface 22 and the second end surface 32 shown in FIG. 2 are formed along the vertical direction in FIG. 2. However, for example, the first end surface 22 may be inclined so as to approach the second end surface 32 toward the first surface 24A (the lower side in FIG. 2), or the second end surface 32 may be inclined so as to approach the first end surface 22 toward the first surface 24A (the lower side in FIG. 2).

[0056] Furthermore, as a modified example of the third embodiment (see Figure 5), a curved hole is formed through the overlapping portion (36) of the second member (62) near the first welded portion (40), and the second welded portion is a portion of the inner surface of the hole in the overlapping portion (36) that includes a surface opposite the second end surface and is joined by arc welding to the first surface (24A) side of the convex portion (24).

[0057] Furthermore, as a modification of the fourth embodiment (see FIG. 6), the second welded portion may be a portion where the overlapping portion (36) and the first surface (24A) of the protruding portion (24) are joined near the first welded portion (40) by laser welding (e.g., LSW, ALW) at multiple points arranged at slight intervals.

[0058] The above-described embodiment and the above-described modifications can be implemented in appropriate combinations.

[0059] The above describes one example of the present invention, but the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms within the scope of the gist of the present invention. [Explanation of symbols]

[0060] 10 Welded Structure 20 First member 22 First end surface 24 Convex part 24A Front page 30 Second member 32 Second end face 34 Inserted part 36 Overlapped section 36A Second side 36B The surface opposite to the second end surface 36H Long hole (hole) 40 First Welding Section 42 Second Weld 50 Welded Structure 52 Second member 54 Second Weld 60 Welded Structure 62 Second member 64 Second Weld 70 Welded Structure 72 Second member 74 Second Weld

Claims

1. a first member including a protruding portion protruding from a first end face that is a predetermined end face, the protruding portion including a first surface formed so as to be continuous with and intersect with the first end face; a second member including: a second end surface arranged to face the first end surface of the first member; and an overlapping portion having a second surface formed continuously with the second end surface facing the first surface of the first member, the second member overlapping the first surface side of the convex portion; a first welded portion where the first end surface and the second end surface are joined by arc welding; a second welded portion which is a portion where the overlapping portion and the first surface side of the convex portion are joined by welding in the vicinity of the first welded portion; A welded structure having:

2. a hole is formed through the overlapping portion in the vicinity of the first welded portion; 2. The welded structure according to claim 1, wherein the second welded portion is a portion of the inner surface of the hole portion of the overlapping portion, including a surface opposite the second end surface, and the first surface side of the convex portion, joined by arc welding.

3. the second member includes an insertion portion into which the convex portion of the first member is inserted and which has the second surface as a constituent portion; a plurality of the first surfaces of the first member are formed on the outer peripheral surface of the convex portion, and a plurality of the second surfaces of the second member are formed corresponding to the plurality of the first surfaces, The welded structure according to claim 1 , wherein the second welded portion is formed to join each of the plurality of overlapping portions to the first surface side of the corresponding protruding portion.

4. The welded structure according to claim 1 , wherein the second welded portion is a portion where the overlapping portion and the first surface side of the convex portion are linearly joined by welding along the first welded portion.

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