JP2012200773A - Welding joint and turbine rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the matters of burn through and the falling of sagging to the inside caused by welding, and also, to prevent the generation of cracks after welding.SOLUTION: In the welding joint in which the inside is made hollow in a state where the joining face 11a of a first member 11 and the joining face 12a of a second member 12 are butted and are joined by welding, the welding joint is provided with a projection 15 to be provided projectingly from the inner fall face 11b forming into the hollow of the first member 11, the tip 15a is extensively formed to cover the inside of a melting part 13 at which the respective faces 11a, 12a are melted while being separated from the internal edges of the respective joining faces 11a, 12a in a state where the respective joining faces 11a, 12a are butted, further, the base end 15b projecting from the inner wall face 11b is continued to the inner wall face 11b via a curbed face 15c, and is continuously formed over the whole circumference of the inside of the respective joining faces 11a, 12a.

Description

  The present invention relates to a welded joined body and a turbine rotor that are hollow inside when joined by welding.

  Conventionally, for example, a weld prep joint described in Patent Document 1 is for welding a first rotor forged product and a second rotor forged product aligned in a pair of axial directions to form a turbine rotor. This weld prep joint has, at the end of the first rotor forging, a first weld joint component with a first radial weld surface and a first axial lavet surface, and an end of the second rotor forging, A second radial welding surface that engages the first radial welding surface, a second axial lavet surface that engages the first axial rabbet surface, and a second radial direction that extends radially inward of the second rabbet surface And a second weld joint component having a third radial non-weld surface offset axially from the weld surface. In this welded prep joint, each radial welding surface to be welded is offset from each axial rabbet surface, and each axial rabbet surface acts as a support surface, so that welding melts and droops. Prevents falling into the turbine rotor.

JP 2006-289500 A

  However, each of the axial rabbet surfaces is a portion that is not welded, and is present in a face-to-face relationship after welding. For this reason, since each axial direction rabbet surface exists like a crack from the beginning of joining, there is a possibility that a new crack may be generated starting from each axial direction rabbet surface due to centrifugal force caused by the rotation of the turbine rotor.

  The present invention solves the above-mentioned problems, and prevents the situation where the melt-down and drooping due to welding fall into the interior in a configuration in which the interior is hollow after being joined by welding, and the occurrence of cracks after welding is prevented. It is an object to provide a welded joint and a turbine rotor that can be prevented.

  In order to achieve the above-described object, the welded joint of the present invention is a welded joint in which the inside is hollow in a state where the joint surface of the first member and the joint surface of the second member are butted and joined by welding. Protruding from the hollow inner wall surface of the first member or the second member, each joining surface is melted while being separated from the inner edge of each joining surface in a state where each joining surface is abutted. A distal end extending from the inner wall surface is formed so as to cover the inner side of the melted portion, and a base end protruding from the inner wall surface continues to the inner wall surface via a curved surface, It is characterized by comprising a projecting piece formed continuously over the circumference.

  According to this welded joint, in order to receive the melt-down and droop generated in the melted part at the position of each inner wall surface by the projecting piece covering the melted part, the melt-down and droop generated in the melted part falls into the hollow interior. Can be prevented. Moreover, the projecting piece is provided apart from the inner edge of each joint surface, and the base end protruding from the inner wall surface of the first member or the second member is continuous with the inner wall surface via the curved surface. Therefore, after welding, a large stress is not locally applied to the base end (base portion) of the projecting piece, and it is possible to prevent generation of a crack starting from the projecting piece.

  In addition, the welded joint of the present invention is provided with an uneven portion that fits in the joint surface of the first member and the joint surface of the second member within the range of the melted portion. To do.

  According to this welded joined body, the butting position between the joining surface of the first member and the joining surface of the second member can be aligned by fitting the concavo-convex portions. For this reason, when welding a welded joined body, a 1st member and a 2nd member can be aligned mutually, welding work can be performed easily and it can join accurately.

  In the welded joint of the present invention, the joint surface of the first member and the joint surface of the second member are both formed in an annular shape, and the concavo-convex portion is convex with respect to one of the joint surfaces. And is formed in a concave shape with respect to the other joining surface, and is continuously formed by a circular locus along the circumferential direction of each joining surface.

  According to this welded joint, the joint surface of the first member and the joint surface of the second member can be aligned with the center of the annular shape by fitting the concavo-convex portions. In addition, since the concavo-convex part is formed continuously with a locus of a circle along the circumferential direction of each joint surface, the convex and concave parts are formed in the circumferential direction of each other when the first member and the second member are joined. The position can be finely adjusted.

  In the welded joint of the present invention, the joint surface of the first member and the joint surface of the second member are both formed in an annular shape, and the concavo-convex portion is convex with respect to one of the joint surfaces. And is formed in a part of a locus of a circle along the circumferential direction of each of the joint surfaces.

  According to this welded joint, the joint surface of the first member and the joint surface of the second member can be aligned with the center of the annular shape by fitting the concavo-convex portions. In addition, since the concavo-convex portion is formed in a part of a locus of a circle along the circumferential direction of each joint surface, the convex shape and the concave shape are formed in the mutual circumferential direction when the first member and the second member are joined. The position can be determined.

  In the welded joint of the present invention, the joint surface of the first member and the joint surface of the second member are both formed in an annular shape, and the concave and convex portions are connected to the joint surfaces. It is formed in the shape of a sawtooth that is continuous along a circular locus along the circumferential direction of the surface.

  According to this welded joint, the joint surface of the first member and the joint surface of the second member can be aligned with the center of the annular shape by fitting the concavo-convex portions. In addition, since the concavo-convex portion has a sawtooth shape, the positions in the circumferential direction can be positioned when the first member and the second member are joined.

  In the welded joint of the present invention, the joint surface of the first member and the joint surface of the second member are both formed in an annular shape, and the concave and convex portions are connected to the joint surfaces. A part of a circular locus along the circumferential direction of the surface is formed in a sawtooth shape.

  According to this welded joint, the joint surface of the first member and the joint surface of the second member can be aligned with the center of the annular shape by fitting the concavo-convex portions. In addition, since the concavo-convex portion has a sawtooth shape, the positions in the circumferential direction can be positioned when the first member and the second member are joined. Moreover, since the concave and convex portions are formed in a sawtooth shape with a part of a circular locus along the circumferential direction of each joint surface, the molding can be performed in a part in the circumferential direction of each joint surface. The manufacturing cost can be reduced.

  Moreover, the welded assembly of the present invention is characterized in that the concavo-convex portion is provided at the outermost edge in each of the joint surfaces.

  The welded joint is welded from the outside by a welding machine, and the melted portion obtained by melting the inner wall surface has the largest width on the outer side and the smallest width at the position of the inner wall surface. According to this welded joint, by providing an uneven portion at the outermost edge having the widest width of the melted portion, the uneven portion can be sufficiently melted, and the soundness of the welded portion is not affected. Moreover, according to this welded assembly, the fitting of the concavo-convex portions can be confirmed from the outside by visual observation or a camera, so that the workability at the time of matching can be improved.

  In order to achieve the above-described object, the turbine rotor of the present invention is divided into a first member and a second member in the axial direction, and a joining surface of the first member and a joining surface of the second member are butted together. A turbine rotor having a cylindrical shape that is continuous in the axial direction in a state of being joined by welding is configured as any one of the above-described welded joints.

  According to this turbine rotor, it is possible to prevent the melting and drooping due to welding from falling into the turbine rotor and to prevent the occurrence of cracks after welding.

  According to the present invention, it is possible to prevent melting and dripping due to welding from falling into the inside, and to prevent generation of cracks after welding.

FIG. 1 is a schematic configuration diagram of a gas turbine to which a welded assembly (turbine rotor) according to an embodiment of the present invention is applied. FIG. 2 is a partial cross-sectional view of the welded assembly (turbine rotor) according to Embodiment 1 of the present invention. FIG. 3 is a partial cross-sectional view showing welding of the welded assembly (turbine rotor) according to Embodiment 1 of the present invention. FIG. 4 is a partial cross-sectional view of a welded assembly (turbine rotor) according to Embodiment 2 of the present invention. FIG. 5 is an end view of the first member of the welded assembly (turbine rotor) according to Embodiment 2 of the present invention. FIG. 6 is an end view of another first member of the welded assembly (turbine rotor) according to Embodiment 2 of the present invention. FIG. 7 is a side view of a part of a welded assembly (turbine rotor) according to Embodiment 3 of the present invention. FIG. 8 is an end view of the first member of the welded assembly (turbine rotor) according to the third embodiment of the present invention. FIG. 9 is an end view of another first member of the welded assembly (turbine rotor) according to Embodiment 3 of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a schematic configuration diagram of a gas turbine according to the present embodiment. As shown in FIG. 1, the gas turbine includes a compressor 111, a combustor 112, a turbine 113, and an exhaust chamber 114, and a generator (not shown) is connected to the turbine 113. The compressor 111 has an air intake 115 for taking in air, and a plurality of stationary blades 117 and moving blades 118 are alternately arranged in the compressor casing 116. The combustor 112 is combustible by supplying fuel to the compressed air compressed by the compressor 111 and igniting it with a burner. In the turbine 113, a plurality of stationary blades 121 and moving blades 122 are alternately arranged in a turbine casing 120. The exhaust chamber 114 has an exhaust diffuser 123 that is continuous with the turbine 113. Further, a rotor (turbine rotor) 124 is positioned so as to pass through the center of the compressor 111, the combustor 112, the turbine 113, and the exhaust chamber 114, and the end on the compressor 111 side is freely rotatable by the bearing portion 125. On the other hand, an end portion on the exhaust chamber 114 side is rotatably supported by a bearing portion 126. A plurality of disk plates are fixed to the turbine rotor 124, the rotor blades 118 and 122 are connected to each other, and a drive shaft of a generator (not shown) is connected to an end portion on the exhaust chamber 114 side. In FIG. 1, a symbol S indicated by a one-dot chain line is a central axis of the turbine rotor 124.

  Therefore, the air taken in from the air intake 115 of the compressor 111 passes through the plurality of stationary blades 121 and the moving blades 122 and is compressed into high-temperature and high-pressure compressed air. Combustion occurs when a predetermined fuel is supplied to the compressed air. The high-temperature and high-pressure combustion gas that is the working fluid generated by the combustor 112 passes through the plurality of stationary blades 121 and the moving blades 122 constituting the turbine 113 to drive and rotate the turbine rotor 124. While the generator connected to the turbine rotor 124 is driven, the exhaust gas is converted into a static pressure by the exhaust diffuser 123 in the exhaust chamber 114 and then released to the atmosphere.

[Embodiment 1]
FIG. 2 is a partial cross-sectional view of the welded assembly (turbine rotor) according to Embodiment 1, and FIG. 3 is a partial cross-sectional view showing welding of the welded assembly (turbine rotor).

  The welded assembly as the turbine rotor 124 of the gas turbine described above is formed by dividing the first member 11 and the second member 12 as shown in FIGS. 2 and 3. The surface 11a and the joint surface 12a of the second member 12 are brought into contact with each other, and the joint surfaces 11a and 12a are joined by welding. This melted part is referred to as a melting part 13. The welded joint is formed with a hollow portion 14 in a state where the joint surface 11a of the first member 11 and the joint surface 12a of the second member 12 are joined. When the welded joint body is the turbine rotor 124, the joint surfaces 11a and 12a are formed in the same annular shape because the turbine rotor 124 is formed in a cylindrical shape.

  In this welded assembly, a projecting piece 15 is provided on the first member 11 or the second member 12. In the present embodiment, as shown in FIGS. 2 and 3, an example in which the projecting piece 15 is provided on the first member 11 is shown. The protruding piece 15 is provided so as to protrude from the inner wall surface 11 b on the hollow portion 14 side of the first member 11. The projecting piece 15 covers the inner side of the melting portion 13 while being spaced apart from the inner edges (inner wall surfaces 11b, 12b) of the respective joint surfaces 11a, 12a with the joint surfaces 11a, 12a being in contact with each other. The tip 15a is formed to extend in the axial direction along the central axis S. The tip 15a of the projecting piece 15 extends from the position of the butted joint surfaces 11a and 12a to the position of the distance B in the axial direction when covering the melting portion 13. Further, the projecting piece 15 is formed such that a base end 15 b protruding from the inner wall surface 11 b of the first member 11 is continuously formed with respect to the inner wall surface 11 b of the first member 11 via a curved surface 15 c. The position where the curved surface 15c continues to the inner wall surface 11b is a position of a distance C in the axial direction from the position of each of the joined surfaces 11a and 12a. Further, the projecting piece 15 is formed with a thickness D in the radial direction orthogonal to the central axis S. And the protrusion 15 is continuously formed over the inner periphery of each joined surface 11a, 12a.

  As shown in FIG. 3, such a welded joint is in a state in which the joint surfaces 11 a and 12 a are in contact with each other, and the tip 15 a of the projecting piece 15 faces upward with the first member 11 having the projecting piece 15 as the lower side. And welded from the outside by a welding machine 10 such as an electron beam welding machine or a laser welding machine. At the time of welding, the welding machine 10 and the welded joint are relatively rotated around the central axis S. In this way, the welded joint that is welded from the outside by the welding machine 10 has a melted portion 13 in which the inner wall surfaces 11b and 12b are melted, as shown in FIG. The width becomes the smallest at the position. And when the fusion | melting part 13 reaches | attains the inner wall surfaces 11b and 12b, the fall and droop resulting from there are received by the protrusion 15 which covers the fusion | melting part 13. FIG. Moreover, by making the front end of the projecting piece 15 upward, the burn-out and drooping that occurs in the melted part 13 at the positions of the inner wall surfaces 11b and 12b are received by the base end 15b of the projecting piece 15 protruding from the inner wall surface 11b. For this reason, the situation where the melt-down and drooping generated in the melting part 13 falls into the hollow part 14 is prevented. Moreover, the projecting piece 15 is provided apart from the inner edge of each joint surface 11a, 12a, and the base end 15b protruding from the inner wall surface 11b of the first member 11 is the inner wall surface 11b of the first member 11. On the other hand, it is formed continuously via the curved surface 15c. For this reason, after welding, since a large stress is not locally applied to the base end (base portion) 15c of the projecting piece 15 due to the centrifugal force caused by the rotation of the turbine rotor 124, the generation of cracks starting from the projecting piece 15 is prevented. .

  Here, an example of each dimension related to the projecting piece 15 will be described. When the welded joined body is the turbine rotor 124, as shown in FIG. 2, the outer radius E is set to 600 [mm] to 3000 [mm], and the first member 11 and the second member 12 (joint surfaces 11a and 12a). ) In the radial direction is 100 [mm] to 200 [mm]. In this case, in order to obtain sufficient bonding strength, the width G of the molten portion 13 obtained by melting the bonding surfaces 11a and 12a is 6 [mm] to 10 [mm] at the positions of the inner wall surfaces 11b and 12b where the width is the smallest. It is preferable that In such a turbine rotor 124, the distance A from the inner edges (inner wall surfaces 11 b, 12 b) of the joint surfaces 11 a, 12 a of the projecting piece 15 appropriately receives the melting and drooping generated from the melting part 13 and is curved. In order not to impair the workability of the surface 15c, the thickness is preferably set to 10 [mm] to 20 [mm]. Further, the distance B from the position of each of the joined joint surfaces 11a and 12a to the tip 15a of the projecting piece 15 is 10 [mm] or more so as to cover the melting portion 13 and appropriately receive the melting and drooping generated from the melting portion 13. It is preferable that Further, the distance C from the position of each of the joined surfaces 11a and 12a to the position where the curved surface 15c continues to the inner wall surface 11b is distanced from the melting portion 13 so that no large stress is applied to the projecting piece 15. 20 [mm] or more is preferable. Further, the thickness D of the projecting piece 15 is preferably set to 10 [mm] to 30 [mm] in order to maintain the strength of the projecting piece 15 while not inhibiting the region of the hollow portion 14. In addition, when an electron beam welding machine is used as the welding machine 10, the example of the welding conditions is based on the material (for example, low alloy steel) and plate thickness (thickness F) of the welded joint, and a current value of 300 [mA] The voltage 150 [kV] and the welding speed (relative rotational speed between the welding machine 10 and the welded joint) 150 [mm / min] can be determined.

  Thus, the welded joint of the present embodiment is a welded joint that has a hollow inside in a state where the joint surface 11a of the first member 11 and the joint surface 12a of the second member 12 are abutted and joined by welding. Yes, provided protruding from the hollow inner wall surface 11b (12b) of the first member 11 (second member 12) and spaced from the inner edge of each joint surface 11a, 12a with the joint surfaces 11a, 12a butted together However, the joint surface 11a, 12a is formed by extending the tip 15a so as to cover the inside of the melted part 13 where the melted surfaces 13a, 12a are melted, and the base end 15b protruding from the inner wall surface 11b (12b) is the inner wall surface 11b. (12b) is provided with a projecting piece 15 which is continuous through the curved surface 15c and continuously formed over the entire inner circumference of each joint surface 11a, 12a.

  According to this welded joint, since the melted-down and drooping that occurs in the melted part 13 at the positions of the inner wall surfaces 11b and 12b are received by the projecting pieces 15 that cover the melted part 13, the melted-down and drooping that occurs in the melted part 13 is hollow. It is possible to prevent the situation of falling into the portion 14. Moreover, the projecting piece 15 is provided apart from the inner edges of the joint surfaces 11a and 12a, and a base end 15b protruding from the inner wall surface 11b (12b) of the first member 11 (second member 12) is provided. Since the inner wall surface 11b (12b) is continuously formed through the curved surface 15c, a large stress is not locally applied to the base end (base portion) 15c of the projecting piece 15 after welding. It becomes possible to prevent the occurrence of cracks starting from the protruding piece 15.

[Embodiment 2]
FIG. 4 is a partial cross-sectional view of the welded assembly (turbine rotor) according to Embodiment 2, and FIG. 5 is an end view of the first member of the welded assembly (turbine rotor).

  The welded joint of the present embodiment is within the range of the fusion zone 13 in the welded joint of the first embodiment, and on the joint surface 11a of the first member 11 and the joint surface 12a of the second member 12, Concave and convex portions 16 that fit together are provided.

  According to this welded joined body, the abutting position between the joining surface 11 a of the first member 11 and the joining surface 12 a of the second member 12 can be aligned by fitting the concavo-convex portion 16. For this reason, when welding a welded joined body, the first member 11 and the second member 12 can be aligned with each other so that the welding operation can be easily performed, and the joining can be performed with high accuracy. .

  Moreover, as for the uneven | corrugated | grooved part 16 in this Embodiment, both the joint surface 11a of the 1st member 11 and the joint surface 12a of the 2nd member 12 are formed in the annular | circular shape. The concavo-convex portion 16 is formed in a convex shape 16a with respect to one joining surface (the joining surface 11a in FIG. 4), and concave 16b with respect to the other joining surface (the joining surface 12a in FIG. 4). It is formed by. Furthermore, as shown in FIG. 5, the concavo-convex portion 16 is continuously formed with a circular locus along the circumferential direction of each joint surface 11a, 12a.

  According to this welded assembly, the joining surface 11a of the first member 11 and the joining surface 12a of the second member 12 are aligned with the center of the annular shape (central axis S) by fitting the concavo-convex portion 16. Is possible. In addition, since the concavo-convex portion 16 is formed such that the convex shape 16a and the concave shape 16b are continuously formed in a circular locus along the circumferential direction of each joint surface 11a, 12a, the first member 11 and the second member 12 It is possible to finely adjust the positions in the circumferential direction at the time of joining.

  Moreover, it is preferable that the uneven | corrugated | grooved part 16 is provided in the outermost edge in each joining surface 11a, 12a.

  As described above, in the welded joint that is welded from the outside by the welding machine 10, the melted portion 13 that melts the inner wall surfaces 11b and 12b has the widest width on the outer side and the widest width at the position of the inner wall surfaces 11b and 12b. Get smaller. According to this welded joint, it is possible to sufficiently melt the concavo-convex portion 16 by providing the concavo-convex portion 16 at the outermost edge having the widest width of the melting portion 13, which affects the soundness of the welded portion. Never give. Moreover, according to this welded assembly, the fitting of the concavo-convex portion 16 can be confirmed from the outside by visual observation or a camera, so that the workability at the time of matching can be improved.

  Here, an example of the axial dimension H and the radial dimension I of the convex shape 16a and the concave shape 16b of the concavo-convex portion 16 will be described. Since the minimum width G of the melting part 13 is 6 [mm] to 10 [mm], the dimension H in the axial direction is 1 [mm] to 4 [4] in order to sufficiently melt the uneven part 16. mm] and the radial dimension I is 2 [mm] to 10 [mm].

  FIG. 6 is an end view of another first member of the welded assembly (turbine rotor) according to the second embodiment. In the welded joint shown in FIG. 6, the concavo-convex portion 16 (convex shape 16 a and concave shape 16 b) is formed intermittently at a part of a circular locus along the circumferential direction of each joint surface 11 a, 12 a.

  According to this welded assembly, the joining surface 11a of the first member 11 and the joining surface 12a of the second member 12 are aligned with the center of the annular shape (central axis S) by fitting the concavo-convex portion 16. Is possible. In addition, the concavo-convex portion 16 is formed such that the convex shape 16a and the concave shape 16b are intermittently formed at a part of the locus of the circle along the circumferential direction of each joint surface 11a, 12a. It is possible to position the positions in the circumferential direction when joining to the member 12.

[Embodiment 3]
FIG. 7 is a side view of a part of the welded assembly (turbine rotor) according to Embodiment 3, and FIG. 8 is an end view of the first member of the welded assembly (turbine rotor).

  The welded joint of the present embodiment is within the range of the fusion zone 13 in the welded joint of the first embodiment, and on the joint surface 11a of the first member 11 and the joint surface 12a of the second member 12, Concave and convex portions 16 that fit together are provided.

  According to this welded joined body, the abutting position between the joining surface 11 a of the first member 11 and the joining surface 12 a of the second member 12 can be aligned by fitting the concavo-convex portion 16. For this reason, when welding a welded joined body, the first member 11 and the second member 12 can be aligned with each other so that the welding operation can be easily performed, and the joining can be performed with high accuracy. .

  Moreover, as for the uneven | corrugated | grooved part 16 in this Embodiment, both the joint surface 11a of the 1st member 11 and the joint surface 12a of the 2nd member 12 are formed in the annular | circular shape. And the uneven | corrugated | grooved part 16 is formed in the sawtooth shape 16c which follows the locus | trajectory of the circle along the circumferential direction of each joint surface 11a, 12a with respect to each joint surface 11a, 12a.

  According to this welded assembly, the joining surface 11a of the first member 11 and the joining surface 12a of the second member 12 are aligned with the center of the annular shape (central axis S) by fitting the concavo-convex portion 16. Is possible. Moreover, since the concavo-convex portion 16 has a sawtooth shape 16 c, it is possible to position the positions in the circumferential direction when the first member 11 and the second member 12 are joined.

  Moreover, it is preferable that the uneven | corrugated | grooved part 16 is provided in the outermost edge in each joining surface 11a, 12a.

  As described above, in the welded joint that is welded from the outside by the welding machine 10, the melted portion 13 that melts the inner wall surfaces 11b and 12b has the widest width on the outer side and the widest width at the position of the inner wall surfaces 11b and 12b. Get smaller. According to this welded joint, it is possible to sufficiently melt the concavo-convex portion 16 by providing the concavo-convex portion 16 at the outermost edge having the widest width of the melting portion 13, which affects the soundness of the welded portion. Never give. Moreover, according to this welded assembly, the fitting of the concavo-convex portion 16 can be confirmed from the outside by visual observation or a camera, so that the workability at the time of matching can be improved.

  Here, an example of the axial dimension H and the radial dimension I of the convex shape 16a and the concave shape 16b of the concavo-convex portion 16 will be described. This dimension is such that the minimum width G of the melting part 13 is 6 [mm] to 10 [mm]. Therefore, as shown in FIG. Is 1 [mm] to 4 [mm], and the radial dimension I is 2 [mm] to 10 [mm].

  FIG. 9 is an end view of another first member of the welded assembly (turbine rotor) according to the third embodiment. In the welded joint shown in FIG. 9, the concavo-convex portion 16 is formed in a sawtooth shape with a part of a circular locus along the circumferential direction of each joint surface 11a, 12a with respect to each joint surface 11a, 12a.

  According to this welded assembly, the joining surface 11a of the first member 11 and the joining surface 12a of the second member 12 are aligned with the center of the annular shape (central axis S) by fitting the concavo-convex portion 16. Is possible. Moreover, since the concavo-convex portion 16 has a sawtooth shape 16 c, it is possible to position the positions in the circumferential direction when the first member 11 and the second member 12 are joined. In addition, since the concave and convex portion 16 has a sawtooth shape 16c formed in a sawtooth shape with a part of a circular locus along the circumferential direction of each joint surface 11a, 12a, the molding of the joint surface 11a, 12a is performed. Since it can be a part in the circumferential direction, it is possible to reduce the manufacturing cost.

  In addition, according to the turbine rotor 124 configured as any one of the above-described welded joints of the above-described embodiments, the situation where the welding melt-down and drooping fall into the turbine rotor is prevented, and cracks after welding are prevented. Occurrence can be prevented.

  In each of the above-described embodiments, the gas turbine is described as an example of the turbine. However, in the turbine rotor of the steam turbine, a similar configuration can be applied as a welded joint to obtain the same effect. .

DESCRIPTION OF SYMBOLS 11 1st member 11a Joining surface 11b Inner wall surface 12 Second member 12a Joining surface 12b Inner wall surface 13 Melting part 14 Hollow part 15 Protrusion piece 15a Tip 15b Base end 15c Curved surface 16 Concavity and convexity part 16a Convex shape 16b Concave shape 16c Serrated 124 Turbine Rotor

Claims (8)

In the welded joint in which the inside is hollow in a state where the joint surface of the first member and the joint surface of the second member are butted and joined by welding,
Protruding from the hollow inner wall surface of the first member or the second member, each joining surface is melted while being separated from the inner edge of each joining surface in a state where each joining surface is abutted. A distal end extending from the inner wall surface is formed so as to cover the inner side of the melted portion, and a base end protruding from the inner wall surface continues to the inner wall surface via a curved surface, A welded joint comprising a projecting piece formed continuously over a circumference.   2. The welded joint according to claim 1, wherein the welded joint is provided with a concave and convex portion that fits in the joint surface of the first member and the joint surface of the second member within the range of the melted portion. .   The joining surface of the first member and the joining surface of the second member are both formed in an annular shape, and the uneven portion is formed in a convex shape with respect to one of the joint surfaces and the other of the joints The welded joint according to claim 2, wherein the welded joint is formed in a concave shape with respect to a surface and continuously formed by a circular locus along a circumferential direction of each joint surface.   The joining surface of the first member and the joining surface of the second member are both formed in an annular shape, and the uneven portion is formed in a convex shape with respect to one of the joint surfaces and the other of the joints The welded joint according to claim 2, wherein the welded joint is formed in a concave shape with respect to a surface and part of a locus of a circle along a circumferential direction of each joint surface.   The joining surface of the first member and the joining surface of the second member are both formed in an annular shape, and the uneven portion is a circular locus along the circumferential direction of each joining surface with respect to each joining surface. The welded joint according to claim 2, wherein the welded joint is formed in a continuous sawtooth shape.   The joint surface of the first member and the joint surface of the second member are both formed in an annular shape, and the concave and convex portions have a locus of a circle along the circumferential direction of the joint surface with respect to the joint surface. The welded joint according to claim 2, wherein the welded joint is partially formed in a sawtooth shape.   The welded joint according to any one of claims 2 to 6, wherein the uneven portion is provided on an outermost edge of each joint surface. It is divided into a first member and a second member in the axial direction, and forms a cylindrical shape that is continuous in the axial direction in a state where the joint surface of the first member and the joint surface of the second member are butted and joined by welding. In the turbine rotor,
A turbine rotor configured as the welded assembly according to any one of claims 1 to 7.

Images