Metal junction, and production method of the same

Abstract

To provide a metal junction which can secure dimension accuracy of a height direction, and can be applied for a pump impeller, and a production method of the metal junction.SOLUTION: A metal junction 1 comprises: a metal first plate member 10 which has a first main surface 11 and a second main surface 12 directed to an opposite side of the first main surface 11; a metal second plate member 20 which has a third main surface 21 and a fourth main surface 22 directed to an opposite side of the third main surface 21. The first plate member 10 has an embossment part 30 where the first main surface 11 side is a salient 31, the second main surface 12 side is a recess 32. The second plate member 20 is configured so that a plate thickness T from the third main surface 21 to the fourth main surface 22, is smaller than that in the embossment part 30 in a plate thickness direction (X axis direction) of the second plate member 20, and an end face 23 connecting peripheral edges of the third main surface 21 and the fourth main surface 22 are joined to the salient 31 of the embossment part 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a metal bonded body and a method for producing the metal bonded body. [Background technology]

[0002] The following Patent Document 1 discloses a conductor joint for connecting circuits of various electronic devices, an electronic component using the same, and a manufacturing method thereof. The conductor joint includes a first conductor made of metal, and a second conductor made of a metal plate having a first surface and a second surface opposite to the first surface and joined to the first conductor, the second conductor having a protrusion protruding locally from the first surface, the second surface of the second conductor having a recess located opposite to the protrusion, the protrusion of the second conductor having a portion that contacts and penetrates into the first conductor and is resistance welded, a diffusion-bonded joint surface is formed between the portion of the protrusion of the second conductor and the first conductor, and the portion of the protrusion of the second conductor has two peaks that protrude locally and penetrate into the first conductor, and a valley portion located between the two peaks, dropping toward the recess and penetrating into the first conductor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6854401 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional technology, the main surfaces (plate surfaces) of the first plate member (first conductor) and the second plate member (second conductor) are joined together. Incidentally, pump impeller prototypes are usually formed by cutting out metal material, but due to the cost, attempts have been made in recent years to manufacture them by press forming. Here, when one of the first plate member and the second plate member is used as the main plate of the pump impeller and the other is used as the blade, a method is considered in which a protrusion is provided on the blade side and solid projection welding is performed approximately perpendicularly (T-shaped) to the main plate. However, when the blade is press formed, sagging and burrs are generated on the punched surface, which affects the height accuracy of the blade after welding, and there is a problem that the dimensional accuracy of the pump impeller cannot be ensured.

[0005] The present invention has been made in consideration of the above problems, and has an object to provide a metal joined body that ensures dimensional accuracy in the height direction and that can be applied to pump impellers and the like, and a method for manufacturing the metal joined body. [Means for solving the problem]

[0006] (1): A metal joined body according to one embodiment of the present invention comprises a first plate member made of a metal having a first main surface and a second main surface facing opposite to the first main surface, and a second plate member made of a metal having a third main surface and a fourth main surface facing opposite to the third main surface, wherein the first plate member has an embossed portion having a convex portion on the first main surface side and a concave portion on the second main surface side, the second plate member has a plate thickness from the third main surface to the fourth main surface in the plate thickness direction of the second plate member that is smaller than that of the embossed portion, and an end face connecting the peripheries of the third main surface and the fourth main surface is joined to the convex portion of the embossed portion.

[0007] (2): In the metal joined body according to (1), the embossed portion may include a first portion extending in a plate thickness direction of the second plate member and joined to the end face, a second portion extending from one end of the first portion along the third main surface of the second plate member, and a third portion extending from the other end of the first portion along the fourth main surface of the second plate member.

[0008] (3): In the metal joined body according to (2), the third main surface and the fourth main surface of the second plate member may be curved, and the second portion and the third portion of the embossed portion may be curved along the third main surface and the fourth main surface.

[0009] (4) In the metal joined body according to (1), the convex portion of the embossed portion may have a triangular shape with a corner facing one side in the plate width direction of the second plate member when the first main surface is viewed in a plane.

[0010] (5): In the metal joined body according to (1), the convex portion of the embossed portion may have a rhombus shape with corners facing both sides in the plate width direction of the second plate member when the first main surface is viewed in a plane.

[0011] (6) In the metal joined body according to (1), the convex portion of the embossed portion may have a semicircular shape convexly curved on one side in the plate width direction of the second plate member when the first main surface is viewed in a plane.

[0012] (7) In the metal joined body according to (1), the convex portion of the embossed portion may have an elliptical shape with both sides convexly curved in the plate width direction of the second plate member when the first main surface is viewed in a plane.

[0013] (8): A manufacturing method of a metal joined body according to one embodiment of the present invention is a manufacturing method of a metal joined body in which a first plate member made of a metal having a first main surface and a second main surface facing opposite to the first main surface and a second plate member made of a metal having a third main surface and a fourth main surface facing opposite to the third main surface are joined, wherein an embossed portion is formed in the first plate member, the first main surface side being a convex portion and the second main surface side being a concave portion, and the second plate member has a plate thickness from the third main surface to the fourth main surface in a plate thickness direction of the second plate member that is smaller than that of the embossed portion, and an end face connecting peripheral edges of the third main surface and the fourth main surface is joined to the convex portion of the embossed portion. Effect of the Invention

[0014] According to the above aspect of the present invention, it is possible to provide a metal joined body that ensures dimensional accuracy in the height direction and is applicable to pump impellers and the like, and a method for manufacturing the metal joined body. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a cross-sectional view showing the configuration of a metal bonded body according to a first embodiment. [Diagram 2] FIG. 2 is a diagram showing a state before a first plate member and a second plate member according to the first embodiment are joined together. [Diagram 3] FIG. 11 is a perspective view of a metal joined body according to a second embodiment. [Figure 4] FIG. 11 is a cross-sectional view of a metal bonded body according to a second embodiment before bonding. [Diagram 5] FIG. 11 is a perspective view of the convex portion side of an embossed portion according to the second embodiment. [Figure 6] FIG. 11 is a perspective view of a metal joined body according to a third embodiment. [Figure 7] FIG. 13 is a perspective view of the convex portion side of the embossed portion according to the third embodiment. [Figure 8] FIG. 11 is a plan view of a metal bonded body according to a fourth embodiment. [Figure 9] FIG. 13 is a plan view of a metal joined body according to a fifth embodiment. [Figure 10] FIG. 13 is a plan view of a metal joined body according to a sixth embodiment. [Figure 11] FIG. 13 is a plan view of a metal bonded body according to the seventh embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0017] (First embodiment) Fig. 1 is a cross-sectional view of a metal joined body 1 according to the first embodiment. Fig. 2 is a view showing a state before joining of a first plate member 10 and a second plate member 20 according to the first embodiment. As shown in Fig. 1, the metal joined body 1 is formed by joining a first metal plate member 10 and a second metal plate member 20 in a T-shape. Note that the joining angle between the first plate member 10 and the second plate member 20 shown in Fig. 1 is a right angle (90°), but is not limited to a right angle and may be an approximately right angle. Note that "approximately a right angle" refers to an angle that allows an inclination of, for example, about 90°±5°.

[0018] The first plate member 10 corresponds to a main plate or a side plate in a pump impeller. The first plate member 10 is not limited to a pump impeller. The first plate member 10 has a first main surface 11 and a second main surface 12 facing the opposite side to the first main surface 11. The "main surface" refers to a set of surfaces with the largest area among the hexahedrons when the first plate member 10 (the same applies to the second plate member 20) is hypothesized as a hexahedron surrounded by six rectangles. The "main surface" is also called the plate surface.

[0019] The second plate member 20 corresponds to a blade in a pump impeller. The second plate member 20 is not limited to a blade of a pump impeller. The second plate member 20 has a third main surface 21 and a fourth main surface 22 facing the opposite side to the third main surface 21. In the following description, an XYZ orthogonal coordinate system is set, and the positional relationship of each member may be described with reference to this XYZ orthogonal coordinate system. The X-axis direction is the plate thickness direction of the second plate member 20, the Y-axis direction is the plate width direction of the second plate member 20, and the Z-axis direction is the height direction of the second plate member 20.

[0020] The first plate member 10 has an embossed portion 30 having a convex portion 31 on the first main surface 11 side and a concave portion 32 on the second main surface 12 side. The embossed portion 30 has a dimension D in the plate thickness direction (X-axis direction) of the second plate member 20. The embossed portion 30 is formed in a circular shape with a diameter of dimension D when the first main surface 11 is viewed in plan.

[0021] The second plate member 20 has a plate thickness T from the third main surface 21 to the fourth main surface 22 which is smaller than the dimension D of the embossed portion 30 in the plate thickness direction (X-axis direction) of the second plate member 20. In other words, there is a relationship of D>T. The second plate member 20 has an end face 23 connecting the peripheries of the third main surface 21 and the fourth main surface 22 joined to the protrusion 31 of the embossed portion 30. Note that, when the second plate member 20 is hypothesized as a hexahedron surrounded by six quadrangles, the "end face" refers to any one of the four faces of the hexahedron excluding one set of main faces of the hexahedron.

[0022] As shown in Fig. 1, a joint 9 is formed between an end face 23 of the second plate member 20 and a protrusion 31 of the embossed portion 30. The joint 9 is shown diagrammatically in Fig. 1, and the joint interface is deformed in a wavy manner during the joining process, and the base materials of the first plate member 10 and the second plate member 20 are mixed and melted at the joint interface.

[0023] As shown in FIG. 2, an embossed portion 30 is formed in a first plate member 10, with a convex portion 31 on the first main surface 11 side and a concave portion 32 on the second main surface 12 side. A second plate member 20 is prepared having a plate thickness T from the third main surface 21 to the fourth main surface 22 that is smaller than that of the embossed portion 30 in the plate thickness direction of the second plate member 20. Furthermore, an end face 23 connecting the peripheral edges of the third main surface 21 and the fourth main surface 22 is joined (emboss projection welding) to the convex portion 31 of the embossed portion 30, thereby producing a metal joined body 1 as shown in FIG. 1.

[0024] According to this metal joined body 1, the embossed portion 30 is formed on the first plate member 10 side (main plate side) and no protrusion is provided on the second plate member 20 side (wing side), so that the metal joined body 1 is less susceptible to sagging and burrs that may occur when the second plate member 20 is press-formed. This reduces the effect on the height accuracy of the second plate member 20 after welding, and ensures the dimensional accuracy of the metal joined body 1. In addition, since the metal joined body 1 can be manufactured by welding press-formed products, the cost can be kept lower than when the same shape is formed by cutting out a metal material.

[0025] Specifically, since the plate thickness T of the second plate member 20 from the third main surface 21 to the fourth main surface 22 is smaller than that of the embossed portion 30 in the plate thickness direction (X-axis direction) of the second plate member 20, after welding, a depression 33 is formed on the top surface of the protrusion 31 of the embossed portion 30, and the second plate member 20 is joined so that the end surface 23 of the second plate member 20 sinks into the depression 33. Since melting occurs in the depression 33 during welding, it is possible to suppress the occurrence of spatter during welding. Specifically, since melting occurs in the depression 33 during welding, the end surface 23 of the second plate member 20 is pressed into the protrusion 31 of the embossed portion 30 during the welding process, thereby forming a pair of raised portions 34, it is possible to suppress the occurrence of spatter during welding. In addition, since the pair of raised portions 34 embrace and join the third main surface 21 and the fourth main surface 22 of the second plate member 20, the joining strength between the first plate member 10 and the second plate member 20 is increased compared to conventional solid projection welding.

[0026] As described above, the metal joined body 1 according to the present embodiment includes a first plate member 10 made of metal having a first main surface 11 and a second main surface 12 facing the opposite side to the first main surface 11, and a second plate member 20 made of metal having a third main surface 21 and a fourth main surface 22 facing the opposite side to the third main surface 21, the first plate member 10 has an embossed portion 30 having a convex portion 31 on the first main surface 11 side and a concave portion 32 on the second main surface 12 side, the plate thickness T from the third main surface 21 to the fourth main surface 22 of the second plate member 20 is smaller than that of the embossed portion 30 in the plate thickness direction (X-axis direction) of the second plate member 20, and the end surface 23 connecting the peripheries of the third main surface 21 and the fourth main surface 22 is joined to the convex portion 31 of the embossed portion 30. According to this configuration, dimensional accuracy in the height direction (Z-axis direction) is ensured, and the product can be applied to pump impellers and the like.

[0027] The manufacturing method of the metal bonded body 1 according to the present embodiment described above is a manufacturing method of the metal bonded body 1 in which a first plate member 10 made of metal having a first main surface 11 and a second main surface 12 facing the opposite side to the first main surface 11 and a second plate member 20 made of metal having a third main surface 21 and a fourth main surface 22 facing the opposite side to the third main surface 21 are bonded to each other, the first plate member 10 is formed with an embossed portion 30 having a convex portion 31 on the first main surface 11 side and a concave portion 32 on the second main surface 12 side, the second plate member 20 is prepared such that the plate thickness from the third main surface 21 to the fourth main surface 22 is smaller than that of the embossed portion 30 in the plate thickness direction of the second plate member 20, and an end surface 23 connecting the peripheries of the third main surface 21 and the fourth main surface 22 is bonded to the convex portion 31 of the embossed portion 30. With this configuration, the metal bonded body 1 can be manufactured.

[0028] Second embodiment Next, a second embodiment of the present invention will be described. In the following description, the same or equivalent configurations as those in the above-described embodiment are given the same reference numerals, and the description thereof will be simplified or omitted.

[0029] Fig. 3 is a perspective view of a metal bonded body 1 according to a second embodiment. Fig. 4 is a cross-sectional configuration view of the metal bonded body 1 according to the second embodiment before bonding. Fig. 5 is a perspective view of the convex portion 31 side of the embossed portion 30A according to the second embodiment. As shown in Fig. 3, the second plate member 20 according to the second embodiment has an extension portion 24 extending on both sides in the plate width direction (Y-axis direction) at the upper end. The extension portion 24 imitates the blade shape of a pump impeller, but may be omitted. The side surface 25 of the second plate member 20 also imitates the blade shape of a pump impeller.

[0030] 5, the first plate member 10 according to the second embodiment has an embossed portion 30A that is H-shaped when the first main surface 11 is viewed in plan. Specifically, the embossed portion 30A includes a first portion 41 extending in the plate thickness direction (X-axis direction) of the second plate member 20, a second portion 42 extending from one end of the first portion 41 to both sides in the plate width direction (Y-axis direction) of the second plate member 20, and a third portion 43 extending from the other end of the first portion 41 to both sides in the plate width direction (Y-axis direction) of the second plate member 20.

[0031] 4, the top surface of the first portion 41 is relatively lower than the top surfaces of the second portion 42 and the third portion 43, and the end surface 23 of the second plate member 20 is joined to the first portion 41. Furthermore, the height difference between the first portion 41 and the second portion 42 and the third portion 43 allows for easy positioning of the second plate member 20. Before joining, the second portion 42 and the third portion 43 both extend in the Z-axis direction.

[0032] Even after joining, the second portion 42 extends along the third main surface 21 of the second plate member 20, and the third portion 43 extends along the fourth main surface 22 of the second plate member 20. Here, "extending along the third main surface 21" is not limited to extending parallel to the YZ plane of the third main surface 21, but also includes extending at a certain degree of inclination with respect to the YZ plane. For example, the inclination may be less than ±45° with respect to the YZ plane, may be less than ±30° with respect to the YZ plane, or may be less than ±15° with respect to the YZ plane. The same applies to "extending along the fourth main surface 22 of the second plate member 20".

[0033] 4 indicates the shape of the protrusion 31 of the embossed portion 30A after welding. The embossed portion 30A is larger than the plate thickness T of the second plate member 20 in the plate thickness direction (X-axis direction) of the second plate member 20, and after welding, a recess is formed in the first portion 41, and the end face 23 of the second plate member 20 is joined so as to sink into the recess. In addition, the second portion 42 and the third portion 43, which are relatively raised, are arranged on both sides of the recess, and the second portion 42 and the third portion 43 abut or join to embrace the third main surface 21 and the fourth main surface 22 of the second plate member 20.

[0034] Thus, in the second embodiment, the embossed portion 30A includes a first portion 41 extending in the plate thickness direction (X-axis direction) of the second plate member 20 and joined to the end face 23, a second portion 42 extending from one end of the first portion 41 along the third main surface 21 of the second plate member 20, and a third portion 43 extending from the other end of the first portion 41 along the fourth main surface 22 of the second plate member 20. With this configuration, it is possible to ensure dimensional accuracy in the height direction (Z-axis direction) as in the first embodiment. Note that in the second embodiment, the dimensions of the second portion 42 and the third portion 43 that embrace the second plate member 20 can be ensured to be long, and therefore the joining strength can be increased compared to the first embodiment.

[0035] Third embodiment Next, a third embodiment of the present invention will be described. In the following description, the same or equivalent configurations as those in the above-described embodiment are given the same reference numerals, and the description thereof will be simplified or omitted.

[0036] Fig. 6 is a perspective view of a metal joined body 1 according to the third embodiment. Fig. 7 is a perspective view of the convex portion 31 side of an embossed portion 30B according to the third embodiment. 6, the second plate member 20 according to the third embodiment has curved third main surface 21 and fourth main surface 22. Specifically, the third main surface 21 and the fourth main surface 22 are curved so as to be convex toward one side (-X side) in the plate thickness direction of the second plate member 20 when the first main surface 11 is viewed in plan.

[0037] 7, the embossed portion 30B according to the third embodiment is formed in a curved H-shape. Specifically, the second portion 42 of the embossed portion 30B is curved along the third main surface 21, and the third portion 43 of the embossed portion 30B is curved along the fourth main surface 22. With this configuration, even if the second plate member 20 is curved, it can be joined to the embossed portion 30B in the same manner as in the above embodiment.

[0038] (Fourth embodiment) Next, a fourth embodiment of the present invention will be described. In the following description, the same or equivalent configurations as those in the above-described embodiment are given the same reference numerals, and the description thereof will be simplified or omitted.

[0039] Fig. 8 is a plan view of a metal joined body 1 according to a fourth embodiment. In Fig. 8, the second plate member 20 is indicated by a two-dot chain line and is a see-through view of the second plate member 20 in order to improve visibility of the protrusions 31. The same applies to Figs. 9 to 11 described below.

[0040] 8, the protrusions 31 of the embossed portion 30C according to the fourth embodiment have a triangular shape when viewed in plan of the first main surface 11. Specifically, the protrusions 31 of the embossed portion 30C have a substantially triangular shape having three rounded corners 51-53, with one corner 51 facing one side (-Y side) in the plate width direction (Y-axis direction) of the second plate member 20.

[0041] According to this configuration, in addition to the advantageous effects of the above-described embodiment, when a flow path (flow from the -Y side to the +Y side) is formed along the plate width direction (Y-axis direction) of the second plate member 20, the flow path resistance in that flow path can be reduced, so that when manufacturing a pump impeller, for example, a value close to the designed efficiency can be obtained.

[0042] Fifth embodiment Next, a fifth embodiment of the present invention will be described. In the following description, the same or equivalent configurations as those in the above-mentioned embodiments are given the same reference numerals, and the description thereof will be simplified or omitted.

[0043] FIG. 9 is a plan view of the metal joined body 1 according to the fifth embodiment. 9, the protrusions 31 of the embossed portion 30D according to the fifth embodiment have a rhombus shape when the first main surface 11 is viewed in plan view. Specifically, the protrusions 31 of the embossed portion 30D have four rounded corners 61-64, and have a rhombus shape with two symmetrical axes that extend in the Y-axis direction being longer than the other, with the two corners 61, 63 in the Y-axis direction facing both sides in the plate width direction (Y-axis direction) of the second plate member 20.

[0044] According to this configuration, in addition to the advantageous effects of the above-described embodiment, when a flow path (flow from the -Y side to the +Y side and flow from the +Y side to the -Y side) is formed along the plate width direction (Y-axis direction) of the second plate member 20, the flow path resistance in that flow path can be reduced, so that when manufacturing a pump impeller, for example, a value close to the designed efficiency can be obtained.

[0045] Sixth embodiment Next, a sixth embodiment of the present invention will be described. In the following description, the same or equivalent configurations as those in the above-described embodiments are given the same reference numerals, and the description thereof will be simplified or omitted.

[0046] FIG. 10 is a plan view of the metal joined body 1 according to the sixth embodiment. 10, the protrusions 31 of the embossed portion 30E according to the sixth embodiment have a semicircular shape (D-shape) when the first main surface 11 is viewed in plan view. Specifically, the protrusions 31 of the embossed portion 30E have a curved surface 71 that is convexly curved on one side (-Y side) in the plate width direction of the second plate member 20, and a flat surface 72 that is aligned with the XZ plane on the other side (+Y side) in the plate width direction of the second plate member 20.

[0047] According to this configuration, in addition to the advantageous effects of the above-described embodiment, when a flow path (flow from the -Y side to the +Y side) is formed along the plate width direction (Y-axis direction) of the second plate member 20, the flow path resistance in that flow path can be reduced, so that when manufacturing a pump impeller, for example, a value close to the designed efficiency can be obtained.

[0048] Seventh embodiment Next, a seventh embodiment of the present invention will be described. In the following description, the same or equivalent configurations as those in the above-described embodiments are given the same reference numerals, and the description thereof will be simplified or omitted.

[0049] FIG. 11 is a plan view of the metal joined body 1 according to the seventh embodiment. 11, the protrusions 31 of the embossed portion 30F according to the seventh embodiment have an elliptical shape when the first main surface 11 is viewed in plan view. Specifically, the protrusions 31 of the embossed portion 30F have curved surfaces 81, 82 that are convexly curved on both sides in the plate width direction of the second plate member 20, and have an elliptical shape with two symmetrical axes, the symmetrical axis extending in the Y-axis direction being longer.

[0050] According to this configuration, in addition to the advantageous effects of the above-described embodiment, when a flow path (flow from the -Y side to the +Y side and flow from the +Y side to the -Y side) is formed along the plate width direction (Y-axis direction) of the second plate member 20, the flow path resistance in that flow path can be reduced, so that when manufacturing a pump impeller, for example, a value close to the designed efficiency can be obtained.

[0051] Although preferred embodiments of the present invention have been described and illustrated above, it should be understood that these are illustrative of the present invention and should not be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the present invention. Thus, the present invention should not be considered as limited by the foregoing description, but rather by the scope of the claims. [Explanation of symbols]

[0052] Reference Signs List 1...metal joint, 9...joint, 10...first plate member, 11...first main surface, 12...second main surface, 20...second plate member, 21...third main surface, 22...fourth main surface, 23...end surface, 24...extension, 25...side surface, 30...embossed portion, 30A...embossed portion, 30B...embossed portion, 30C...embossed portion, 30D...embossed portion, 30E...embossed portion portion, 30F...embossed portion, 31...projection portion, 32...recess, 33...dent, 34...raised portion, 41...first portion, 42...second portion, 43...third portion, 51...corner portion, 52...corner portion, 53...corner portion, 61...corner portion, 62...corner portion, 63...corner portion, 64...corner portion, 71...curved surface, 72...flat surface, 81...curved surface, 82...curved surface, D...dimension, T...plate thickness

Claims

1. a first plate member made of metal having a first main surface and a second main surface facing the opposite side to the first main surface; a second plate member made of metal having a third main surface and a fourth main surface facing the opposite side to the third main surface; the first plate member has an embossed portion having a convex portion on the first main surface side and a concave portion on the second main surface side, The second plate member has a plate thickness from the third main surface to the fourth main surface in a plate thickness direction of the second plate member that is smaller than that of the embossed portion, and an end surface connecting the periphery of the third main surface and the fourth main surface is joined to the convex portion of the embossed portion. Metal joint.

2. The embossed portion is a first portion extending in a plate thickness direction of the second plate member and joined to the end surface; a second portion extending from one end of the first portion along the third main surface of the second plate member; and a third portion extending from the other end of the first portion along the fourth main surface of the second plate member. The metal joined body according to claim 1 .

3. The third main surface and the fourth main surface of the second plate member are curved, The second portion and the third portion of the embossed portion are curved along the third main surface and the fourth main surface. The metal joined body according to claim 2 .

4. When the first main surface is viewed in plan, the protrusion of the embossed portion has a triangular shape including a corner portion facing one side in a plate width direction of the second plate member. The metal joined body according to claim 1 .

5. When the first main surface is viewed in plan, the convex portion of the embossed portion has a rhombus shape having corners facing both sides in the plate width direction of the second plate member. The metal joined body according to claim 1 .

6. When the first main surface is viewed in plan, the convex portion of the embossed portion has a semicircular shape in which one side in a plate width direction of the second plate member is curved convexly. The metal joined body according to claim 1 .

7. When the first main surface is viewed in plan, the convex portion of the embossed portion has an elliptical shape in which both sides in the plate width direction of the second plate member are convexly curved. The metal joined body according to claim 1 .

8. a first plate member made of metal having a first main surface and a second main surface facing the opposite side to the first main surface; a second plate member made of a metal and having a third main surface and a fourth main surface facing an opposite side to the third main surface, An embossed portion is formed on the first plate member, the first plate member having a convex portion on the first main surface side and a concave portion on the second main surface side, The second plate member is prepared such that a plate thickness from the third main surface to the fourth main surface is smaller than that of the embossed portion in a plate thickness direction of the second plate member, and an end surface connecting peripheral edges of the third main surface and the fourth main surface is joined to the convex portion of the embossed portion. A method for manufacturing a metal joint.

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