JP2019162663A - Welding method and welding joined body - Google Patents

Abstract

To provide a technology which can adequately secure reliability of a welded part of a first type metal material and a second type metal material of different kinds from each other.SOLUTION: A first type metal material 11 is a metal material having higher embrittlement resistance after melting and solidification than a second type metal material 12. A welding method includes: a first process of scanning an irradiation position 31 of an energy beam 30 from a first position P1 to a second position P2 along a boundary part 10 and forming a linear melted and solidified part 41 along the boundary part 10; and a second process of scanning the irradiation position 31 of the energy beam 30 from the second position P2 to a third position P3 as a first side D1 position than the second position P2 when a side from a side of the second type metal material 12 to a side of the first type metal material 11 in a direction D intersecting with the boundary part 10 is the first side D1 after the first process, and finishing irradiation of the energy beam 30.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a welding method for welding different types of first-type metal materials and second-type metal materials, and welded joints of different types of first-type metal materials and second-type metal materials.

  As a technique for manufacturing a product by joining metal materials together by welding, JP-A-2015-119557 (Patent Document 1) includes a step of welding the shaft body (10) and the end plate (30). A method for manufacturing a rotor (1) for a rotating electrical machine is disclosed. As described in paragraphs 0027 and 0038 of Patent Document 1, the shaft body (10) and the end plate (30) are made of a weldable metal material such as iron, stainless steel, and aluminum alloy. In the description of the background art, the reference numerals shown in parentheses are those of Patent Document 1.

  By the way, the type of metal material constituting the part is selected according to the performance and characteristics (for example, mechanical strength, electrical characteristics, magnetic characteristics, processing characteristics, etc.) required for each part. There are cases where two target metal materials are different types of metal materials. In this case, a structure in which the components of these two metal materials are mixed is formed in the welded portion of the two metal materials, and a brittle structure may be formed in the welded portion depending on the welding conditions. When welding is performed by scanning the irradiation position of an energy beam such as a laser beam or an electron beam, the molten metal melted by the irradiation of the energy beam flows backward in the scanning direction. A crater (concave portion) is formed due to the lack of. In addition, since residual stress and strain are likely to increase at the welding end position, if a brittle structure is formed at the welding end position, there is a possibility that the reliability of the welded portion may be reduced, such as cracking is likely to occur. However, Patent Document 1 does not describe this point.

JP2015-119557A

  Therefore, it is desired to realize a technique capable of appropriately ensuring the reliability of the welded portion between the first type metal material and the second type metal material of different types.

  In view of the above, welding is performed by irradiating an energy beam to the boundary between different types of first-type metal material and second-type metal material, and welding the first-type metal material and the second-type metal material. A characteristic configuration of the method is that the first type metal material is a metal material having higher resistance to embrittlement after melting and solidification than the second type metal material, and the irradiation position of the energy beam is set along the boundary portion. A first step of scanning from the first position to the second position to form a linear melted and solidified portion along the boundary portion, and a side of the second type metal material along a direction intersecting the boundary portion From the first step, the energy beam irradiation position is a position on the first side of the second position after the first step. Scanning from the second position until the end of the irradiation of the energy beam. There to that point.

According to said characteristic structure, since a welding method is provided with a 2nd process in addition to a 1st process, a welding termination position can be made into the 3rd position which is a position of the 1st side rather than a 2nd position. Since the first side is the side from the second type metal material side to the first type metal material side along the direction intersecting the boundary between the first type metal material and the second type metal material, welding is performed. By setting the end position to the third position, it is possible to increase the melting ratio of the first type metal material at the welding end position as compared to the case where the welding end position is the second position. Since the first type metal material is a metal material having higher resistance to embrittlement after melting and solidification than the second type metal material, the welding end position is increased by increasing the melting ratio of the first type metal material at the welding end position. It is possible to keep the brittleness of the structure formed in a low level (that is, keep the degree of brittleness low). As a result, it is possible to appropriately ensure the reliability of the welded portion between the first type metal material and the second type metal material of different types.
Further, unlike the third position, the second position is an irradiation position of the energy beam when forming the linear melted and solidified portion along the boundary portion, and therefore the depth of the crater that can be formed at the second position. Tends to have a large effect on the reliability of the weld. In this regard, according to the above-described characteristic configuration, since the molten metal can be supplied to the second position by executing the second step, even if a crater is formed at the second position, The depth can be kept small. Furthermore, in the second step, since the irradiation position of the energy beam is scanned from the second position to the first side, the ratio of the first type metal material contained in the molten metal supplied to the second position is increased. Thus, the brittleness of the tissue formed at the second position can be suppressed low. According to said characteristic structure, it is possible to ensure the reliability of a welding part appropriately also from these points.

  In view of the above, the characteristic configuration of the welded joint of the first type metal material and the second type metal material of different types is that the first type metal material is more melt-solidified than the second type metal material. It is a metal material having high resistance to embrittlement, and the first type metal material and the second type metal material are melted and solidified along the boundary between the first type metal material and the second type metal material. A first molten and solidified portion is formed, and the first molten and solidified portion is defined as a first side from the second type metal material side to the first type metal material side along a direction intersecting the boundary portion. The second melt-solidified part is formed by melting and solidifying at least the first-type metal material so as to extend from a part of the part to the first side.

According to the above characteristic configuration, since the second melt-solidified portion is formed in the welded joint in addition to the first melt-solidified portion, the irradiation position of the energy beam is scanned to form these melt-solidified portions. In addition, the welding end position can be a formation position of the second melt-solidified portion (for example, a formation position of an end portion of the second melt-solidified portion opposite to the connection portion with the first melt-solidified portion). The second melt-solidified part is formed so as to extend from a part of the first melt-solidified part to the first side, and the first side intersects the boundary part between the first type metal material and the second type metal material. Along the direction from the second-type metal material side to the first-type metal material side. Therefore, by setting the welding end position as the formation position of the second melt-solidified portion, the melting ratio of the first-type metal material at the welding end position compared to the case where the welding end position becomes the formation position of the first melt-solidified portion. Can be increased. Since the first type metal material is a metal material having higher resistance to embrittlement after melting and solidification than the second type metal material, the welding end position is increased by increasing the melting ratio of the first type metal material at the welding end position. The brittleness of the structure formed can be kept low. As a result, it is possible to appropriately ensure the reliability of the welded portion between the first type metal material and the second type metal material of different types.
In addition, unlike the second melt-solidified portion, the first melt-solidified portion is formed along the boundary portion. Therefore, the depth of the crater that can be formed in the first melt-solidified portion has an influence on the reliability of the welded portion. Tends to grow. In this regard, according to the above-described characteristic configuration, since the welding end position where the crater is likely to be formed can be set to a position where the first melt-solidified portion is not formed, the crater is temporarily formed in the first melt-solidified portion. Even in this case, the depth can be kept small. According to said characteristic structure, it is possible also from this point to ensure the reliability of a welding part appropriately.

  Further features and advantages of the welding method and the welded joint will become apparent from the following description of the embodiments described with reference to the drawings.

The top view of the welding part which concerns on embodiment Cross-sectional view of the weld zone showing an example of the shape of the melt-solidified zone Metal structure chart Explanatory drawing of the 1st process concerning an embodiment Explanatory drawing of the 2nd process concerning an embodiment Flow chart showing the welding method Plan view of a part of a welded joint according to another embodiment VIII-VIII sectional view in FIG. IX-IX sectional view in FIG. Plan view of welded parts according to other embodiments Plan view of welded parts according to other embodiments Plan view of welded parts according to other embodiments

  An embodiment of a welding method and a welded joint will be described with reference to the drawings. As described below, the welding method irradiates the energy beam 30 to the boundary portion 10 between the first-type metal material 11 and the second-type metal material 12 of different types, so that the first-type metal material 11 and the second-type metal material 11 This is a method of welding the seed metal material 12. By such a welding method, the welded joined bodies 1 of the first type metal material 11 and the second type metal material 12 of different types can be obtained.

  As shown in FIG. 1, a melted and solidified portion 40 is formed in the welded portion 20 of the first type metal material 11 and the second type metal material 12 in the welded joint 1. The melted and solidified portion 40 is formed by solidifying molten metal (welded metal) melted by irradiation with the energy beam 30. As will be described below, in the present embodiment, the melt-solidified part 40 includes a first melt-solidified part 41 and a second melt-solidified part 42. The energy beam 30 is, for example, a laser beam or an electron beam.

  As shown in FIG. 1, the welded joint 1 includes a first type metal material 11 and a second type along a boundary portion 10 (opposing portion) between the first type metal material 11 and the second type metal material 12. A first melt-solidified portion 41 is formed by melting and solidifying the metal material 12. The first melt-solidified part 41 is a linear melt-solidified part along the boundary part 10. In the present embodiment, the boundary portion 10 is formed so as to extend linearly. Specifically, the boundary portion 10 extends linearly when viewed from the irradiation side of the energy beam 30 (upper side in FIG. 2). Is formed. In the present embodiment, the first molten and solidified portion 41 is formed in a straight line shape (a straight line shape in a plan view) along the boundary portion 10. Here, the first melt-solidified part 41 is formed in a straight line parallel to the boundary part 10. Hereinafter, the direction along the boundary portion 10 in plan view is defined as a first direction B1 (see FIG. 1). That is, the first direction B <b> 1 is the extending direction of the first melting and solidifying part 41. In the following, the direction along the boundary portion 10 (joint surface between the first type metal material 11 and the second type metal material 12) in the cross section orthogonal to the first direction B1 is defined as the second direction B2 (see FIG. 2). ). That is, the second direction B <b> 2 is the depth direction of the first melting and solidifying part 41.

  As shown in FIG. 1, the welded bonded body 1 includes a second molten and solidified portion 42 in which at least the first type metal material 11 is melted and solidified so as to extend from a part of the first molten and solidified portion 41 to the first side D1. Is formed. In the present embodiment, the second melt-solidified part 42 is formed so as to extend from the end of the first melt-solidified part 41 in the first direction B1 to the first side D1. Here, the 1st side D1 is a side which goes to the 1st type metal material 11 side from the 2nd type metal material 12 side along the direction (intersection direction D) which cross | intersects the boundary part 10. FIG. Further, a second side D2 to be described later is directed from the first type metal material 11 side to the second type metal material 12 side along the cross direction D on the opposite side to the first side D1 in the cross direction D. On the side. The intersecting direction D is a direction intersecting the boundary portion 10 in plan view. In the present embodiment, the intersecting direction D is, for example, a direction that intersects the boundary portion 10 at a right angle (that is, a direction orthogonal to the boundary portion 10). That is, the intersecting direction D is a direction orthogonal to both the first direction B1 and the second direction B2. In the present embodiment, the second molten and solidified portion 42 is formed in a straight line shape (a straight line shape in plan view) along the intersecting direction D. Here, the second melt-solidified part 42 is formed in a straight line parallel to the intersecting direction D.

  As shown in FIG. 2, here, the outer surface (the upper surface in FIG. 2) of the second type metal material 12 on which the energy beam 30 is irradiated is the side on which the energy beam 30 of the first type metal material 11 is irradiated. 2 is illustrated as being parallel to the outer surface (the upper surface in FIG. 2), but the outer surface on the side irradiated with the energy beam 30 in the second type metal material 12 is the energy beam in the first type metal material 11. It can also be set as the structure arrange | positioned so that it may cross | intersect with respect to the outer surface of the side to which 30 is irradiated (for example, it arrange | positions so that it may orthogonally cross).

  The first type metal material 11 and the second type metal material 12 are different types of metal materials. Therefore, in the welded portion 20 between the first type metal material 11 and the second type metal material 12, a structure in which the components of the first type metal material 11 and the second type metal material 12 are mixed is formed. Then, the composition of the structure formed in the welded portion 20 (the composition of the weld metal) changes according to the melting ratio W of the first type metal material 11. Here, as shown in FIG. 2, the melting ratio W is an area indicated by “11a” in the cross section (cross section orthogonal to the first direction B1) of the melt-solidified portion 40 (melting area of the first type metal material 11). And the area indicated by “12a” (the melting area of the second type metal material 12) and the area indicated by “11a” (the melting area of the first type metal material 11).

  The characteristics of the structure formed in the welded portion 20 are closer to the characteristics of the second type metal material 12 as the melting ratio W is lower, and closer to the characteristics of the first type metal material 11 as the melting ratio W is higher. Become. The first type metal material 11 is a metal material having higher embrittlement resistance after melting and solidification than the second type metal material 12. Therefore, the brittleness of the structure formed in the welded portion 20 increases as the melting ratio W decreases (that is, the degree of brittleness increases), and decreases as the melting ratio W increases (that is, the brittleness). To a lesser extent).

  In the present embodiment, the first type metal material 11 is a stainless steel material, and the second type metal material 12 is a carbon steel material. In the present embodiment, the first type metal material 11 is a stainless steel material having a smaller amount of carbon than the second type metal material 12. The stainless steel constituting the first type metal material 11 can be, for example, stainless steel containing chromium and nickel (that is, austenitic or austenitic / ferritic stainless steel). As an example, the stainless steel constituting the first type metal material 11 can be SUS304 defined in Japanese Industrial Standard (JIS). Moreover, the carbon steel which comprises the 2nd type metal material 12 can be made into carbon steel for machine structures, for example. As an example, the carbon steel constituting the second type metal material 12 can be S25C defined in JIS.

  The structure formed in the welded portion 20 of the first type metal material 11 and the second type metal material 12 is austenite (A), ferrite (F), from the metal structure diagram (Schaeffler's structure diagram) shown in FIG. It can be estimated whether it is martensite (M) and these mixed structures. Specifically, as shown in FIG. 3, the point determined by the chromium equivalent (Creq) and the nickel equivalent (Nieq) of the first type metal material 11 is when the melting ratio W is 100 (%). A point indicating the structure (that is, the structure of the first type metal material 11) and determined by the chromium equivalent (Creq) and the nickel equivalent (Nieq) of the second type metal material 12 is the melting ratio W being 0 (%). The structure in the case (that is, the structure of the second type metal material 12) is shown. And the point on the straight line connecting these two points represents the structure formed in the welded portion 20, and the point indicating the structure formed in the welded portion 20 is “W = 100 as the melting ratio W increases. Move toward the point indicated by “(%)”. From FIG. 3, as the melting ratio W decreases, the chromium equivalent or nickel equivalent of the structure formed in the welded portion 20 decreases, and the structure becomes brittle and easily cracked (for example, cold cracking is likely to occur). I understand that. From FIG. 3, as the melting ratio W increases, the chromium equivalent or nickel equivalent of the structure formed in the welded portion 20 increases, and according to this, the structure that can suppress cracking (for example, low temperature cracking) and embrittlement. It turns out that it becomes. That is, as the melting ratio W decreases, the structure formed in the welded portion 20 easily becomes martensite, and as the melting ratio W increases, the structure formed in the welded portion 20 easily becomes austenite.

  The melting ratio W in the welded portion 20 changes according to the center position (position in the cross direction D) of the irradiation range of the energy beam 30 when welding is performed. Specifically, the irradiation center 32 is the first side D1 with respect to the boundary portion 10 with the melting ratio W when the irradiation center 32 (the center of the irradiation range) of the energy beam 30 coincides with the boundary portion 10 as a reference melting ratio. In this case, the melting ratio W becomes larger than the reference melting ratio. In this case, the melting ratio W increases as the separation distance A (see FIG. 2) between the irradiation center 32 and the boundary portion 10 increases. . On the other hand, when the irradiation center 32 is located on the second side D <b> 2 with respect to the boundary portion 10, the melting ratio W is smaller than the reference melting ratio. In this case, the separation distance A between the irradiation center 32 and the boundary portion 10. As the value increases, the melting ratio W decreases.

  Next, a welding method according to the present embodiment for welding the first type metal material 11 and the second type metal material 12 by irradiating the boundary portion 10 with the energy beam 30 will be described. As shown in FIG. 6, this welding method includes a first step S1 and a second step S2.

  As shown in FIG. 4, in the first step S <b> 1, the irradiation position 31 of the energy beam 30 is scanned along the boundary portion 10 from the first position P <b> 1 to the second position P <b> 2 to form the first molten and solidified portion 41. It is a process. Note that scanning of the irradiation position 31 of the energy beam 30 is performed by moving (for example, linearly moving or rotating) at least one of the irradiation position 31 and the metal material (11, 12). In FIG. 4, the movement locus of the irradiation center 32 of the energy beam 30 in the first step S1 is indicated by an arrow. In the present embodiment, in the first step S1, the irradiation position 31 of the energy beam 30 is scanned in one direction from the first position P1 to the second position P2. Therefore, one end portion in the first direction B1 of the first melt-solidified portion 41 is formed at the first position P1, and the other end portion of the first melt-solidified portion 41 in the first direction B1 is the second position P2. Formed. In other words, in the present embodiment, the first position P1 that is the welding start end position is a formation position of one end portion in the first direction B1 in the first melt-solidified portion 41, and the second step from the first step S1. The second position P2, which is the irradiation position 31 of the energy beam 30 when moving to S2, is the formation position of the other end of the first melted and solidified portion 41 in the first direction B1.

  FIG. 4 shows a state where the energy beam 30 is applied to the second position P2. Therefore, the molten pool 50 is formed by the molten metal in the second position P2, and the keyhole 51 is formed by the vapor pressure of the metal and the surface tension of the molten metal. On the other hand, in the portion on the rear side in the scanning direction from the second position P2 (the portion on the first position P1 side), the molten metal is solidified to form the first molten and solidified portion 41.

  As shown in FIG. 4, in the present embodiment, in the first step S <b> 1, the irradiation center 32 of the energy beam 30 is positioned on the first type metal material 11 side (first side D <b> 1) with respect to the boundary portion 10. Then, the energy beam 30 is irradiated. Thereby, compared with the case where the energy beam 30 is irradiated so that the irradiation center 32 of the energy beam 30 is located at the boundary portion 10, the melting ratio W at the time of forming the first melt-solidified portion 41 is increased, and the first It is possible to keep the brittleness of the structure constituting the melt-solidified part 41 low. The separation distance A between the irradiation center 32 and the boundary portion 10 when performing the first step S1 is set to a distance at which the melting ratio W is a value within a range of 45 (%) to 80 (%), for example. . In the present embodiment, as shown in FIG. 2, in the first step S1, the energy beam 30 is irradiated in a direction inclined with respect to the second direction B2. Specifically, the energy beam 30 is irradiated so that the energy beam 30 enters the irradiation center 32 from the first side D1.

  In the present embodiment, the composition of the structure formed in the welded portion 20 can be adjusted by the position of the irradiation center 32 with respect to the boundary portion 10 (the position in the crossing direction D). It is a welding process that does not use (additive materials). In the present embodiment, the second step S2 described below is also a welding step that does not use a filler.

  As shown in FIG. 5, in the second step S2, after the first step S1, the irradiation position 31 of the energy beam 30 is second up to the third position P3 that is a position on the first side D1 from the second position P2. This is a step of scanning from the position P2 and ending the irradiation of the energy beam 30. That is, in this embodiment, 2nd process S2 is a process of forming the 2nd melt solidification part 42. FIG. In FIG. 5, the movement locus of the irradiation center 32 of the energy beam 30 in the first step S1 is indicated by a broken line, and the movement locus of the irradiation center 32 of the energy beam 30 in the second step S2 is indicated by a solid arrow. In the present embodiment, in the second step S2, the irradiation position 31 of the energy beam 30 is scanned in one direction from the second position P2 to the third position P3. Therefore, the position of the end of the second melt-solidified portion 42 opposite to the connection portion with the first melt-solidified portion 41 is formed at the third position P3. In other words, the third position P3, which is the welding end position, is a formation position of the second melt-solidified part 42. In the present embodiment, the connection part of the second melt-solidified part 42 with the first melt-solidified part 41 is It is the formation position of the opposite end. In the present embodiment, the third position P3 is the same position as the second position P2 and the first direction B1.

  Thus, by setting the third position P3, which is the position on the first side D1 relative to the second position P2, as the welding end position, the welding method does not include the second step S2, and the welding end position is the second position P2. As compared with the case where it becomes, it is possible to increase the melting ratio W at the welding end position, and to suppress the brittleness of the structure formed at the welding end position. Since the third position P3 is a welding end position, residual stress and strain tend to increase. However, since the brittleness of the structure formed at the third position P3 can be suppressed in this way, the third position P3. It is possible to make the structure in which cracks hardly occur. In addition, since the 3rd position P3 is a position away from the boundary part 10, even if a crack generate | occur | produces in the 3rd position P3, the influence which it has on the reliability of the welding part 20 is limited.

  In addition, since the molten metal can be supplied to the second position P2 by executing the second process S2 after the first process S1, a crater is temporarily formed at the second position P2. However, it is possible to keep the depth small. That is, if the welding condition in the first step S1 is that the welding end position is the second position P2, the crater whose depth as indicated by the broken line in FIG. 5 is the first depth Z1 is the second position. Even when the welding conditions are formed at P2, the molten metal is supplied to the second position P2 by executing the second step S2, thereby reducing the depth of the crater formed at the second position P2. (In the example shown in FIG. 5, the depth of the crater is set to the second depth Z2 smaller than the first depth Z1). Note that, depending on the amount of molten metal supplied to the second position P2 by executing the second step S2, a crater may not be formed at the second position P2. Furthermore, in the second step S2, since the irradiation position 31 of the energy beam 30 is scanned from the second position P2 to the first side D1, the first type contained in the molten metal supplied to the second position P2 is used. It is also possible to reduce the brittleness of the structure formed at the second position P2 by increasing the ratio of the metal material 11.

  As shown in FIG. 5, in the present embodiment, the third position P3 is a position where the molten pool 50 is formed by being separated from the boundary portion 10 on the first type metal material 11 side (first side D1). It is. That is, as shown in FIG. 5, the molten pool 50 formed in a state where the energy beam 30 is irradiated to the third position P <b> 3 is formed apart from the boundary portion 10 on the first side D <b> 1. In the present embodiment, the third position P3 is a position where the molten pool 50 is formed so as to be separated from the first molten solidified portion 41 toward the first type metal material 11 side (first side D1). That is, as shown in FIG. 5, the molten pool 50 formed in a state where the energy beam 30 is irradiated to the third position P3 is formed away from the first molten solidified portion 41 on the first side D1. Is done. By setting the third position P3 to such a position, most of the molten metal in the molten pool 50 becomes the first-type metal material 11 in a state where the energy beam 30 is irradiated to the third position P3, It is easy to ensure a high melting ratio W of the first type metal material 11 at the three position P3. It should be noted that the third position P3 is separated from the first molten solidification part 41 to the first side D1 and the molten pool 50 is not formed, or the molten pool 50 is separated from the boundary part 10 to the first side D1. It is also possible to set the position where 50 is not formed.

  In the present embodiment, in the second step S2, the irradiation position 31 of the energy beam 30 is melted away from the first melting and solidifying part 41 toward the first type metal material 11 side (first side D1). The irradiation intensity of the energy beam 30 is equal to (for example, the same as) the irradiation intensity of the energy beam 30 in the first step S1 until the pond 50 is moved to a position (specific position) where the pond 50 is formed. The specific position is a position where the end of the second side D2 of the molten pool 50 is located at the same position in the cross direction D as the end of the first side D1 of the first molten solidification part 41, with the third position P3 as a limit. Rather than the first side D1. By setting it as such a structure, it is possible to ensure much quantity of the molten metal supplied with respect to 2nd position P2 by execution of 2nd process S2. Although the second step S2 is started while the irradiation intensity of the energy beam 30 is maintained equal to the irradiation intensity of the energy beam 30 in the first step S1, the second step S2 is started on the first side D1 with respect to the first molten and solidified portion 41. The configuration in which the irradiation intensity of the energy beam 30 is reduced at the time when the molten pool 50 is not formed at a distance or the irradiation intensity of the energy beam 30 in the first process S1 from the beginning of the second process S2. It is also possible to adopt a configuration in which the intensity is lower than the irradiation intensity.

  It is also possible to adopt a configuration in which the irradiation intensity of the energy beam 30 is gradually reduced (for example, reduced at a constant rate of change) at the start time of the second step S2 or later. At this time, the initial value of the irradiation intensity of the energy beam 30 (the value before being gradually reduced) can be made equal (for example, the same) as the irradiation intensity of the energy beam 30 in the first step S1. In a case where the irradiation intensity of the energy beam 30 is gradually reduced at a time later than the start time of the second step S2, for example, when the irradiation position 31 of the energy beam 30 reaches the specific position described above, the energy beam It can be set as the structure which reduces the irradiation intensity | strength of 30 gradually.

[Other Embodiments]
Next, other embodiments of the welding method and the welded joint will be described.

(1) In the above-described embodiment, the configuration in which the boundary portion 10 is formed so as to extend linearly and the first melt-solidified portion 41 is formed in a linear shape along the boundary portion 10 has been described as an example. However, without being limited to such a configuration, the boundary portion 10 is formed so as to extend in a curved shape, and the first melt-solidified portion 41 is formed in a curved shape along the boundary portion 10. You can also. An example of such a configuration is shown in FIGS.

  In the example shown in FIGS. 7 to 9, the end plate 62 and the support member 63 included in the rotating electrical machine 60 are the welded joint 1 of the first type metal material 11 and the second type metal material 12. Specifically, the first type metal material 11 is an end plate 62 attached to the axial end surface 61 a of a cylindrical rotor core 61 provided in the rotating electrical machine 60, and the second type metal material 12 is an inner periphery of the rotor core 61. The support member 63 is disposed so as to be in contact with the surface 61 b and supports the rotor core 61. The support member 63 is formed in a cylindrical shape that extends in the axial direction L of the rotating electrical machine 60. The inner peripheral surface of the end plate 62 is disposed so as to face the outer peripheral surface of the support member 63 in the radial direction R of the rotating electrical machine 60, and the inner peripheral surface of the end plate 62 and the outer peripheral surface of the support member 63 are Are joined by welding at the first welding portion 21. The first welds 21 are formed at a plurality of locations in the circumferential direction C. The first welded portion 21 corresponds to the welded portion 20 in the above embodiment, but here, the boundary portion 10 between the first type metal material 11 and the second type metal material 12 is the circumferential direction C of the rotating electrical machine 60. The first melt-solidified portion 41 is also formed in a curved shape (arc shape) extending along the circumferential direction C. In this example, the circumferential direction C is the first direction B1, the axial direction L is the second direction B2, and the radial direction R is the intersecting direction D.

  In the example shown in FIGS. 7 to 9, the inner peripheral surface of the rotor core 61 and the outer peripheral surface of the support member 63 are joined at the second welding portion 22 by welding. The second welded portions 22 are formed at a plurality of locations in the circumferential direction C. Here, as shown in FIG. 7 and FIG. 8, the outer side in the axial direction L (on the side away from the central portion of the rotor core 61 in the axial direction L) in a partial region in the circumferential direction C on the inner peripheral surface of the end plate 62. A notch 62a that exposes the axial end surface 61a of the rotor core 61 when viewed from the top is formed. As a result, in a state where both the rotor core 61 and the end plate 62 are assembled to the support member 63, the shaft is opposed to the boundary portion 10 (opposing portion) between the inner peripheral surface of the end plate 62 and the outer peripheral surface of the support member 63. The process of forming the first welded portion 21 by irradiating the energy beam 30 from the outside in the direction L, and the axial direction L with respect to the boundary portion (opposing portion) between the inner peripheral surface of the rotor core 61 and the outer peripheral surface of the support member 63 It is possible to perform the process of forming the second welded portion 22 by irradiating the energy beam 30 from the outside. The “rotary electric machine” is used as a concept including any of a motor (electric motor), a generator (generator), and a motor / generator functioning as both a motor and a generator as necessary.

(2) In the above embodiment, the configuration in which the second melt-solidified portion 42 is formed so as to extend from the end portion of the first melt-solidified portion 41 in the first direction B1 to the first side D1 has been described as an example. However, the present invention is not limited to such a configuration. For example, as in the example shown in FIG. 10, the second molten and solidified portion 42 is located on the first side D1 from the intermediate portion in the first direction B1 in the first molten and solidified portion 41. It can also be set as the structure formed so that it may extend. In the example shown in FIG. 10, in the first step S1, the irradiation position 31 of the energy beam 30 is scanned in one direction from the first position P1 to the fourth position P4, and then from the fourth position P4 to the second position P2 (the first position P2). It can be configured to scan in the reverse direction up to a position between the first position P1 and the fourth position P4. In this case, one end portion in the first direction B1 of the first melt-solidified portion 41 is formed at the first position P1, and the other end portion of the first melt-solidified portion 41 in the first direction B1 is the fourth position. P4 is formed. The position of the irradiation center 32 of the energy beam 30 when the irradiation position 31 of the energy beam 30 is scanned from the fourth position P4 to the second position P2 is the same as the irradiation position 31 of the energy beam 30 from the first position P1 to the fourth position. The same position in the intersecting direction D as the irradiation center 32 of the energy beam 30 when scanning to the position P4 may be used, or a position shifted in the intersecting direction D (for example, a position shifted in the first side D1).

(3) In the above embodiment, the configuration in which the third position P3 is the same position in the first direction B1 as the second position P2 has been described as an example. However, without being limited to such a configuration, the third position P3 may be a position different from the second position P2 in the first direction B1. Two examples of such a configuration are shown in FIGS.

  In the example shown in FIG. 11, the side from the first position P1 to the second position P2 along the boundary portion 10 (that is, along the first direction B1) is defined as the scanning direction front side SD, and the third position P3 is It is a position on the front side SD in the scanning direction with respect to the second position P2. In this example, as in the above embodiment, the first position P1 is the formation position of one end of the first direction B1 in the first melt-solidified portion 41, and the second position P2 is the first melt It is the formation position of the end of the other side of the solidification part 41 in the first direction B1. Therefore, in the example shown in FIG. 11, the second melt-solidified part 42 is the first melt-solidified part 41 in the first melt-solidified part 41 with the one side in the first direction B1 (the same side as the scanning direction front side SD) as the boundary direction first side BD It is formed so as to extend from the end of the boundary direction first side BD to the first side D1 and toward the boundary direction first side BD toward the first side D1. That is, the second molten and solidified portion 42 is formed in a linear shape inclined with respect to the intersecting direction D.

  As described above, when the third position P3 is set to the position in the scanning direction front side SD with respect to the second position P2, the scanning direction front side in the scanning direction of the irradiation position 31 of the energy beam 30 in the second step S2. SD component is included. For this reason, the first step S1 to the second step without stopping the scanning of the irradiation position 31 toward the scanning direction front side SD at the second position P2 (for example, while maintaining the scanning speed toward the scanning direction front side SD). It is possible to move to S2. For example, when using a first scanning mechanism that scans the irradiation position 31 along the first direction B1 and a second scanning mechanism that scans the irradiation position 31 along the intersecting direction D, the first step S1 includes the first scanning mechanism. The scanning mechanism is operated to scan the irradiation position 31 from the first position P1 to the second position P2. In the second step S2, irradiation is performed by operating the second scanning mechanism while continuing the operation of the first scanning mechanism. The position 31 can be scanned from the second position P2 to the third position P3.

  Also in the example shown in FIG. 12, the third position P3 is set to the position in the scanning direction front side SD with respect to the second position P2, as in the example shown in FIG. However, in the example shown in FIG. 12, the fifth position P5 is set between the second position P2 and the third position P3, and in the second step S2, the irradiation position 31 of the energy beam 30 is changed to the second position P2. From the fifth position P5 to the third position P3. The fifth position P5 is a position between the second position P2 and the third position P3 in the first direction B1, and is set to the same position in the intersecting direction D with the third position P3. Therefore, in the example shown in FIG. 12, in the second step S <b> 2, the third molten and solidified portion 43 is formed in addition to the second molten and solidified portion 42. Here, the second melt-solidified part 42 extends from the end of the first melt-solidified part 41 on the first boundary side BD to the first side D1, and extends in the first boundary direction toward the first side D1. It is formed to face the side BD. In addition, the third melt-solidified portion 43 extends from the end of the second melt-solidified portion 42 on the side opposite to the connecting portion with the first melt-solidified portion 41 along the boundary portion 10 (here, the boundary portion 10). It is formed so as to extend to the boundary direction first side BD. As described above, in the example illustrated in FIG. 12, the melt solidification part 40 includes the third melt solidification part 43 in addition to the first melt solidification part 41 and the second melt solidification part 42.

  In the example shown in FIG. 12, compared with the example shown in FIG. 11, the irradiation position 31 from the second position P2 to the third position P3 while suppressing the formation region of the melt-solidified portion 40 from becoming larger in the intersecting direction D. It is easy to ensure a long distance along the scanning direction. Therefore, when the irradiation intensity of the energy beam 30 is gradually reduced at the start time of the second step S2 or later, the irradiation intensity of the energy beam 30 at the third position P3 that is the welding end position is reduced. This makes it easy to suppress the depth of the crater that can be formed at the third position P3. In the example shown in FIG. 12, when the irradiation intensity of the energy beam 30 is gradually reduced at a time later than the start time of the second step S2, for example, the irradiation position 31 of the energy beam 30 is the fifth position P5. It can be configured that the irradiation intensity of the energy beam 30 is gradually decreased at the time of reaching or before the time.

(4) In the above embodiment, in the first step S1, the energy beam 30 is irradiated so that the irradiation center 32 of the energy beam 30 is located on the first type metal material 11 side with respect to the boundary portion 10. Was described as an example. However, the present invention is not limited to such a configuration. In the first step S1, the energy beam 30 is irradiated such that the irradiation center 32 of the energy beam 30 is positioned at the boundary portion 10, or in the first step S1. The energy beam 30 may be irradiated so that the irradiation center 32 of the energy beam 30 is positioned on the second type metal material 12 side with respect to the boundary portion 10.

(5) In the above embodiment, the first type metal material 11 is a stainless steel material and the second type metal material 12 is a carbon steel material as an example. However, without being limited to such a configuration, for example, the first type metal material 11 is a carbon steel material and the second type metal material 12 is a cast iron material, or the first type metal material 11 Is a carbon steel material, and the second type metal material 12 can be configured to be a carbon steel material having a larger amount of carbon than the first type metal material 11. That is, among the two different types of metal materials, the metal material with a small amount of carbon or carbon equivalent can be the first type metal material 11 and the remaining metal material can be the second type metal material 12. In this way, the first type metal material 11 can be configured to have a smaller carbon amount or carbon equivalent than the second type metal material 12 using the carbon amount or carbon equivalent as an index (an index related to hardness or brittleness). .

(6) In the above embodiment, the configuration in which the second melt-solidified portion 42 is formed linearly along the intersecting direction D has been described as an example. However, without being limited to such a configuration, for example, as in the example shown in FIGS. 11 and 12, the second melt-solidified portion 42 is formed in a straight line inclined with respect to the intersecting direction D. You can also In addition, a configuration in which the position in the direction along the boundary portion 10 of the second melt-solidified portion 42 (position in the first direction B1) is not constant along the intersecting direction D, for example, the second melt-solidified portion 42 is in plan view. It can also be set as the structure formed in a curve shape.

(7) It should be noted that the configuration disclosed in each of the above-described embodiments is applied in combination with the configuration disclosed in the other embodiment unless there is a contradiction (between the embodiments described as other embodiments. (Including combinations) is also possible. Regarding other configurations, the embodiments disclosed herein are merely examples in all respects. Accordingly, various modifications can be made as appropriate without departing from the spirit of the present disclosure.

[Overview of the above embodiment]
Hereinafter, the outline of the welding method and the welded joint described above will be described.

  The energy beam (30) is applied to the boundary (10) between the first-type metal material (11) and the second-type metal material (12) of different types, and the first-type metal material (11) and the A welding method for welding a second type metal material (12), wherein the first type metal material (11) has higher resistance to embrittlement after melting and solidification than the second type metal material (12). It is a metal material, and the irradiation position (31) of the energy beam (30) is scanned from the first position (P1) to the second position (P2) along the boundary portion (10), and the boundary portion (10 ) Along the direction (D) intersecting the boundary portion (10) and the first step (S1) for forming a linear melt-solidified portion (41) along After the first step (S1), the side going from the side toward the first type metal material (11) side as the first side (D1), The irradiation position (31) of the energy beam (30) is scanned from the second position (P2) to the third position (P3) which is the position on the first side (D1) rather than the second position (P2). And a second step (S2) for terminating the irradiation of the energy beam (30).

According to this configuration, since the welding method includes the second step (S2) in addition to the first step (S1), the welding end position is set at a position closer to the first side (D1) than the second position (P2). A third position (P3) can be set. The first side (D1) is the second type metal material (12) along the direction (D) intersecting the boundary (10) between the first type metal material (11) and the second type metal material (12). Since the welding end position is the third position (P3), the welding end position is the second position (P2) compared to the case where the welding end position is the third position (P3). Thus, the melting ratio (W) of the first type metal material (11) at the welding end position can be increased. Since the first type metal material (11) is a metal material having higher resistance to embrittlement after melting and solidification than the second type metal material (12), the first type metal material (11) is melted at the welding end position. By increasing the ratio (W), the brittleness of the structure formed at the welding end position can be kept low (that is, the degree of brittleness can be kept low). As a result, it is possible to appropriately ensure the reliability of the welded portion (20) between the first type metal material (11) and the second type metal material (12) of different types.
The second position (P2) is different from the third position (P3), and the irradiation position of the energy beam (30) when forming the linear melted and solidified portion (41) along the boundary portion (10). Since it is (31), the depth of the crater that can be formed at the second position (P2) tends to have a great influence on the reliability of the welded part (20). In this regard, according to the above configuration, since the molten metal can be supplied to the second position (P2) by executing the second step (S2), a crater is temporarily formed at the second position (P2). Even if it is a case, the depth can be restrained small. Furthermore, in the second step (S2), since the irradiation position (31) of the energy beam (30) is scanned from the second position (P2) to the first side (D1), the second position (P2) By increasing the ratio of the first type metal material (11) contained in the molten metal supplied in this way, the brittleness of the structure formed at the second position (P2) can be kept low. According to said structure, it is possible to ensure the reliability of a welding part (20) appropriately also from these points.

  Here, a side from the first position (P1) to the second position (P2) along the boundary portion (10) is defined as a scanning direction front side (SD), and the third position (P3) is It is preferable that the position is on the front side (SD) in the scanning direction with respect to the second position (P2).

  In this configuration, the scanning direction front side (SD) component is included in the scanning direction of the irradiation position (31) of the energy beam (30) in the second step (S2). Therefore, it is possible to shift from the first step (S1) to the second step (S2) without stopping the scanning of the irradiation position (31) to the front side (SD) in the scanning direction at the second position (P2). . As a result, the irradiation amount of the energy beam (30) at the second position (P2) is made closer to the irradiation amount at the position on the first position (P1) side with respect to the second position (P2), that is, It becomes easy to reduce the bias of the irradiation amount of the energy beam (30). Further, it becomes easy to avoid remelting of the melt-solidified structure at the second position (P2), and a structure with low segregation of the low-melting-point material is easily formed at the second position (P2). As a result, it becomes easy to ensure the reliability of the welded part (20) appropriately.

  In the first step (S1), the center (32) of the irradiation range of the energy beam (30) is positioned on the first type metal material (11) side with respect to the boundary portion (10). Further, it is preferable to irradiate the energy beam (30).

  According to this structure, compared with the case where the energy beam (30) is irradiated such that the center (32) of the irradiation range of the energy beam (30) is located at the boundary (10) in the first step (S1). The melting ratio (W) of the first-type metal material (11) when forming the linear melt-solidified part (41) can be increased. Therefore, the brittleness of the structure constituting the linear melt-solidified part (41) can be suppressed low, and the reliability of the welded part (20) can be further increased.

  The third position (P3) is preferably a position where the molten pool (50) is formed so as to be separated from the boundary portion (10) toward the first type metal material (11). is there.

  According to this configuration, the third position (P3) that is the welding end position is large in the molten metal in the molten pool (50) in a state where the energy beam (30) is irradiated to the third position (P3). It can be set as the position from which a part becomes 1st type metal material (11). Therefore, it becomes easy to ensure a high melting ratio (W) of the first type metal material (11) at the third position (P3).

  In addition, it is preferable that the irradiation intensity of the energy beam (30) is gradually reduced at the start time of the second step (S2) or at a later time.

  According to this configuration, the irradiation intensity of the energy beam (30) at the start of the second step (S2) is such that an appropriate amount of molten metal can be supplied to the second position (P2). The irradiation intensity of the energy beam (30) at the third position (P3), which is the welding end position, is gradually reduced as it goes toward the third position (P3). It is easy to suppress the depth of the crater that can be formed at the third position (P3).

  Further, the third position (P3) is a position where a molten pool (50) is formed apart from the linear melted and solidified portion (41) toward the first type metal material (11). Yes, in the second step (S2), the irradiation position (31) of the energy beam (30) is on the first type metal material (11) side with respect to the linear melted and solidified portion (41). The irradiation intensity of the energy beam (30) is the same as the irradiation intensity of the energy beam (30) in the first step (S1) until it moves to a position where the molten pool (50) is formed. It is preferable that they are equivalent.

Even with this configuration, most of the molten metal in the molten pool (50) is obtained in the state where the third position (P3), which is the welding end position, is irradiated with the energy beam (30) to the third position (P3). Can be a position to become the first type metal material (11), and it becomes easy to ensure a high melting ratio (W) of the first type metal material (11) at the third position (P3).
In addition, according to this configuration, the irradiation position (31) of the energy beam (30) melts away from the linear melted and solidified portion (41) toward the first type metal material (11). Until the pond (50) is moved to the position where the pond (50) is formed, the irradiation intensity of the energy beam (30) is made equal to the irradiation intensity of the energy beam (30) in the first step (S1). Therefore, compared with the case where the irradiation intensity of the energy beam (30) is made lower than the irradiation intensity of the energy beam (30) in the first step (S1) from the beginning of the second step (S2), the second step. By executing (S2), a large amount of molten metal supplied to the second position (P2) can be secured. Therefore, even if a crater is formed at the second position (P2), it is easy to keep the depth small.

  In addition, it is preferable that the first type metal material (11) has a carbon amount or a carbon equivalent less than the second type metal material (12).

  According to this configuration, by increasing the melting ratio (W) of the first type metal material (11) in the welded portion (20) between the first type metal material (11) and the second type metal material (12), The carbon content or carbon equivalent of the structure formed in the welded part (20) can be suppressed to a low level, so that the hardness of the structure can be kept low, that is, the brittleness of the structure can be kept low. Therefore, the brittleness of the structure | tissue formed in the 3rd position (P3) which is a welding termination position can be restrained low by performing the welding method of each structure mentioned above.

  Moreover, it is preferable that the first type metal material (11) is a stainless steel material and the second type metal material (12) is a carbon steel material.

  According to this configuration, when the first-type metal material (11) is a stainless steel material containing chromium and nickel, the welded portion between the first-type metal material (11) and the second-type metal material (12) ( By increasing the melting ratio (W) of the first type metal material (11) in 20), a large amount of chromium equivalent and nickel equivalent of the structure formed in the welded part (20) is secured, and the hardness of the structure is lowered. In other words, the brittleness of the tissue can be kept low. Therefore, the brittleness of the structure | tissue formed in the 3rd position (P3) which is a welding termination position can be restrained low by performing the welding method of each structure mentioned above.

  The first type metal material (11) is an end plate (62) attached to an axial end surface (61a) of a cylindrical rotor core (61) included in the rotating electrical machine (60), and the second type metal The material (12) is preferably a support member (63) that is disposed so as to be in contact with the inner peripheral surface (61b) of the rotor core (61) and supports the rotor core (61).

  According to this configuration, when the rotary electric machine (60) is manufactured by joining the end plate (62) and the support member (63) made of different kinds of metal materials by welding, the end plate (62) The reliability of the welded portion (20) between the support member (63) and the support member (63) can be appropriately ensured.

  A welded joint (1) of a first type metal material (11) and a second type metal material (12) of different types, wherein the first type metal material (11) is the second type metal material. (12) is a metal material having higher resistance to embrittlement after melting and solidification, and along the boundary portion (10) between the first type metal material (11) and the second type metal material (12), In a direction (D) in which a first melt-solidified part (41) is formed by melting and solidifying the first-type metal material (11) and the second-type metal material (12) and intersects the boundary part (10). A side from the second type metal material (12) side to the first type metal material (11) side is defined as a first side (D1) from a part of the first melt-solidified part (41). A second melt-solidified portion (42) is formed so that at least the first-type metal material (11) is melt-solidified so as to extend to the first side (D1).

According to this configuration, since the second melt-solidified part (42) is formed in the welded joint (1) in addition to the first melt-solidified part (41), the irradiation position (31) of the energy beam (30) is formed. Are scanned to form these melt-solidified portions (41, 42), the welding end position is defined as the formation position of the second melt-solidified portion (42) (for example, the first melt-solidified portion (42) in the first melt-solidified portion (42)). The position of the end portion on the side opposite to the connecting portion with the melt-solidified portion (41) can be used. The second molten and solidified portion (42) is formed to extend from a part of the first molten and solidified portion (41) to the first side (D1), and the first side (D1) is formed of the first type metal material (11). ) Toward the first type metal material (11) side from the second type metal material (12) side along the direction (D) intersecting the boundary (10) between the second type metal material (12). On the side. Therefore, by setting the welding end position as the formation position of the second melt-solidified portion (42), the first position at the welding end position is compared with the case where the welding end position is the formation position of the first melt-solidified portion (41). The melting ratio (W) of the seed metal material (11) can be increased. Since the first type metal material (11) is a metal material having higher resistance to embrittlement after melting and solidification than the second type metal material (12), the first type metal material (11) is melted at the welding end position. By increasing the ratio (W), the brittleness of the structure formed at the welding end position can be kept low. As a result, it is possible to appropriately ensure the reliability of the welded portion (20) between the first type metal material (11) and the second type metal material (12) of different types.
Moreover, since the 1st melt-solidification part (41) is formed along a boundary part (10) unlike the 2nd melt-solidification part (42), the crater of the crater which can be formed in a 1st melt-solidification part (41) The effect of the depth on the reliability of the welded part (20) tends to be large. In this regard, according to the above configuration, the welding end position where the crater is likely to be formed can be a position where the first melt-solidified portion (41) is not formed. Even when craters are formed, the depth can be kept small. According to said structure, it is possible also from this point to ensure the reliability of a welding part (20) appropriately.

  Here, the first-side metal material (11) extends from the second-type metal material (12) side along the direction (D) perpendicular to the boundary portion (10). ), And the second melt-solidified part (42) is the first melt with the one side of the direction (B1) along the boundary part (10) as the boundary direction first side (BD). The solidification part (41) extends from the end of the first boundary direction side (BD) to the first side (D1) and extends toward the first side (D1). BD) is preferably formed so as to face.

  According to this configuration, the end of the first melt-solidified part (41) opposite to the first side (BD) in the boundary direction is the welding start position, and the first melt-solidified part in the second melt-solidified part (42). By scanning the irradiation position (31) of the energy beam (30) with the end opposite to the connection with (41) as the welding end position, the above-described melt-solidified portion (41, 42) is formed. can do. At this time, since the component on the first side (BD) in the boundary direction is included in the scanning direction of the irradiation position (31) at the time of forming the second melt-solidified part (42), the boundary direction first of the irradiation position (31) is included. The second melting is performed after the formation of the first molten and solidified portion (41) without stopping the scanning to the first side (BD) at the connecting portion between the first molten and solidified portion (41) and the second molten and solidified portion (42). A solidified part (42) can be formed. As a result, the irradiation amount of the energy beam (30) at the connecting portion between the first melt-solidified portion (41) and the second melt-solidified portion (42) is set at a position on the welding start end position side with respect to the connecting portion. It is easy to approach the irradiation amount of the light beam, that is, to reduce the unevenness of the irradiation amount of the energy beam (30). In addition, it becomes easy to avoid remelting of the melt-solidified structure at the joint between the first melt-solidified part (41) and the second melt-solidified part (42), and the structure with low segregation of the low-melting-point material is connected. It becomes easy to form in the part. As a result, it becomes easy to ensure the reliability of the welded part (20) appropriately.

  In addition, it is preferable that the first type metal material (11) has a carbon amount or a carbon equivalent less than the second type metal material (12).

  According to this configuration, by increasing the melting ratio (W) of the first type metal material (11) in the welded portion (20) between the first type metal material (11) and the second type metal material (12), The carbon content or carbon equivalent of the structure formed in the welded part (20) can be suppressed to a low level, so that the hardness of the structure can be kept low, that is, the brittleness of the structure can be kept low. Therefore, the brittleness of the structure | tissue formed in a welding termination position can be restrained low by making a welding termination position into a formation position of a 2nd melt-solidification part (42) as mentioned above.

  Moreover, it is preferable that the first type metal material (11) is a stainless steel material and the second type metal material (12) is a carbon steel material.

  According to this configuration, when the first-type metal material (11) is a stainless steel material containing chromium and nickel, the welded portion between the first-type metal material (11) and the second-type metal material (12) ( By increasing the melting ratio (W) of the first type metal material (11) in 20), a large amount of chromium equivalent and nickel equivalent of the structure formed in the welded part (20) is secured, and the hardness of the structure is lowered. In other words, the brittleness of the tissue can be kept low. Therefore, the brittleness of the structure | tissue formed in a welding termination position can be restrained low by making a welding termination position into a formation position of a 2nd melt-solidification part (42) as mentioned above.

  The first type metal material (11) is an end plate (62) attached to an axial end surface (61a) of a cylindrical rotor core (61) included in the rotating electrical machine (60), and the second type metal The material (12) is preferably a support member (63) that is disposed so as to be in contact with the inner peripheral surface (61b) of the rotor core (61) and supports the rotor core (61).

  According to this configuration, when the end plate (62) and the support member (63) included in the rotating electrical machine (60) are welded joints obtained by welding different types of metal materials, the end plate (62) The rotating electrical machine (60) with high reliability of the welded part (20) between the support member (63) and the support member (63) can be realized.

  The welding method and the welded assembly according to the present disclosure only need to exhibit at least one of the effects described above.

1: Welded joint 10: Boundary part 11: Type 1 metal material 12: Type 2 metal material 30: Energy beam 31: Irradiation position 32: Irradiation center (center of irradiation range)
41: 1st melt-solidification part (linear melt-solidification part)
42: 2nd melt solidification part 50: Molten pool 60: Rotary electric machine 61: Rotor core 61a: Axial end surface 61b: Inner peripheral surface 62: End plate 63: Support member B1: 1st direction (direction along a boundary part)
BD: Boundary direction first side D: Crossing direction (direction crossing the boundary)
D1: First side P1: First position P2: Second position P3: Third position S1: First step S2: Second step SD: Front side in scanning direction

Claims (14)

A welding method of irradiating an energy beam to a boundary between a first type metal material and a second type metal material of different types to weld the first type metal material and the second type metal material,
The first type metal material is a metal material having higher resistance to embrittlement after melting and solidification than the second type metal material,
A first step of scanning the irradiation position of the energy beam from the first position to the second position along the boundary portion to form a linear melt-solidified portion along the boundary portion;
The side from the second type metal material side to the first type metal material side along the direction intersecting the boundary is defined as a first side, and the irradiation position of the energy beam is set after the first step. And a second step of scanning from the second position to a third position which is a position on the first side of the second position, and ending the irradiation of the energy beam.   The side from the first position to the second position along the boundary portion is defined as a front side in the scanning direction, and the third position is a position on the front side in the scanning direction with respect to the second position. The welding method according to 1.   The said 1st process WHEREIN: The said energy beam is irradiated so that the center of the irradiation range of the said energy beam may be located in the said 1st type metal material side with respect to the said boundary part. Welding method.   The welding method according to any one of claims 1 to 3, wherein the third position is a position where a molten pool is formed so as to be separated from the boundary portion toward the first type metal material.   The welding method according to any one of claims 1 to 4, wherein the irradiation intensity of the energy beam is gradually reduced at the start time of the second step or after the start time. The third position is a position where a molten pool is formed apart from the linear molten solidified portion on the first type metal material side,
In the second step, until the irradiation position of the energy beam moves to a position where a molten pool is formed apart from the linear molten solidified portion on the first type metal material side, The welding method according to any one of claims 1 to 5, wherein an irradiation intensity of the energy beam is equal to an irradiation intensity of the energy beam in the first step.   The said 1st type metal material is a welding method as described in any one of Claim 1 to 6 with less carbon amount or a carbon equivalent than the said 2nd type metal material.   The welding method according to any one of claims 1 to 7, wherein the first type metal material is a stainless steel material, and the second type metal material is a carbon steel material.   The first type metal material is an end plate attached to an axial end surface of a cylindrical rotor core provided in the rotating electrical machine, and the second type metal material is disposed so as to contact an inner peripheral surface of the rotor core, and The welding method according to claim 1, wherein the welding method is a support member that supports the rotor core. It is a welded joint of a first type metal material and a second type metal material of different types,
The first type metal material is a metal material having higher resistance to embrittlement after melting and solidification than the second type metal material,
A first molten and solidified portion is formed by melting and solidifying the first type metal material and the second type metal material along a boundary between the first type metal material and the second type metal material,
A side from the second type metal material side to the first type metal material side along the direction intersecting the boundary part is defined as a first side, and the first side from a part of the first melt-solidified part A welded joined body in which at least a second melt-solidified portion in which the first-type metal material is melted and solidified is formed to extend to. The first side is a side from the second type metal material side toward the first type metal material side along a direction intersecting at a right angle to the boundary portion,
One side of the direction along the boundary portion is defined as a boundary direction first side, and the second melt-solidified portion extends from the end portion of the first melt-solidified portion to the first side in the boundary direction first side. The welded joint according to claim 10, wherein the welded joint is formed so as to go to the first side in the boundary direction as going to the first side.   The welded joint according to claim 10 or 11, wherein the first type metal material has a carbon amount or a carbon equivalent less than that of the second type metal material.   The welded joint according to any one of claims 10 to 12, wherein the first type metal material is a stainless steel material, and the second type metal material is a carbon steel material. The first type metal material is an end plate attached to an axial end surface of a cylindrical rotor core provided in the rotating electrical machine, and the second type metal material is disposed so as to contact an inner peripheral surface of the rotor core, and The welded assembly according to any one of claims 10 to 13, which is a support member that supports the rotor core.

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