T-joint structure, welding method thereof, and railway vehicle production method

Abstract

To provide a T-joint structure which enables beam welding from a vertical plate side of a T-joint.SOLUTION: A T-joint structure includes a welded part which is welded such that an end surface of a vertical plate and a front surface of a horizontal plate are butted in the T-shape. A protrusion stripe that is integral with or is a separate body from the vertical plate is provided at a position along the longitudinal direction of the welded part. A portion or the whole of the protrusion stripe becomes weld metal that coagulates after melting and welds the welded part. The weld metal after welding bulges on the outer side with respect to an exposed surface that is not the contact surface with the horizontal plate on the outer surface of the protrusion stripe before welding. The exposed surface that is not the contact surface with the horizontal plate on the outer surface of the protrusion stripe before welding is in parallel with the contact surface or the exposed surface that is not the contact surface with the horizontal plate in the protrusion stripe before welding may cross the contact surface at an acute angle. Moreover, the protrusion stripe may be integrally formed with the vertical plate before welding, or another member may be joined to the vertical plate before welding in advance. Alternatively, the protrusion stripe before welding may be a separate body that does not belong to any of the vertical plate and the horizontal plate.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a T-joint structure compatible with beam welding, a welding method therefor, and a method for producing railway vehicles to which the same is applied. [Background technology]

[0002] In recent years, in addition to electron beam welding, in which high-density energy generated by an electron gun is irradiated onto the target area to melt it at high temperatures, laser beam welding (collectively abbreviated as "beam welding") has been applied to automobile and aircraft parts, etc., due to its precision, high quality, and high efficiency. However, because the electron guns used for this beam welding generally have a large, suspended structure, it is limited to robotic construction, in which the beam is irradiated in a downward direction from directly above the weld area.

[0003] Therefore, beam welding has limitations on the degree of freedom in the beam irradiation direction. For example, a T-joint, in which the end face of one plate is placed on the surface of another plate and welded to form a T, requires an oblique fillet weld. However, since it is difficult to irradiate the beam at an oblique angle, it has often been necessary to supplement it with arc welding or other manual work, which has a high degree of freedom. In response to this, the full penetration welding method for T-joints described in Patent Document 1, which is based on beam welding, has realized a joining method in which a high-energy density beam is irradiated from the back surface of the T-joint. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 63-203286 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the full-penetration welding method for T-joints described in Patent Document 1 involves welding from the back side of the T-joint, i.e., the opposite side of the vertical plate, instead of diagonal fillet welding. Therefore, depending on the shape of the object, if welding work is required from the vertical plate direction, beam welding is difficult with the current structure.

[0006] Therefore, depending on the shape of the object, it may not be possible to achieve the objective by beam welding alone, and it may be necessary to rely on conventional arc welding, etc. The present invention has been made in view of the above-mentioned problems, and its object is to provide a T-joint structure that enables beam welding from the vertical plate side of the T-joint. [Means for solving the problem]

[0007] The present invention, which solves the above-mentioned problems, is a T-joint structure having a welded portion where the end face of a vertical plate and the surface of a horizontal plate are butted together in a T shape and welded, and a convex strip, either integral with or separate from the vertical plate, is provided at a position along the longitudinal direction of the welded portion, and part or all of the convex strip becomes weld metal that solidifies after melting, welding the welded portion together, and the weld metal after welding is raised outside the exposed surface of the outer surface of the convex strip before welding that is not in contact with the horizontal plate. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a T-joint structure that enables beam welding from the vertical plate side of the T-joint. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of an assembly configuration in which a hanging lug is welded to a flat plate by applying a T-joint structure according to Example 1 of the present invention. [Figure 2] FIG. 2 is an enlarged perspective view for explaining a joint in the assembled configuration of FIG. 1. [Figure 3] 3 is an enlarged cross-sectional view of a main part for explaining a joint portion indicated by a broken line in FIG. 2. FIG. [Figure 4] FIG. 10 is a perspective view of an assembly configuration in which a hanging lug is welded to a flat plate by applying a T-joint structure according to a comparative example. [Figure 5] 5 is an enlarged cross-sectional view of a main part when arc welding is applied to the joint indicated by the broken line in FIG. 4. FIG. [Figure 6] 5 is an enlarged cross-sectional view of a main part when beam welding is applied to the joint portion indicated by the broken line in FIG. 4. FIG. [Figure 7] FIG. 4 is an enlarged cross-sectional view of a main part of a modified example in which an inclination is provided on the convex stripe cross section of FIG. 3. [Figure 8] FIG. 10 is a perspective view illustrating welding of a suspension lug and a housing by applying a T-joint structure using a horseshoe-shaped convex strip member according to a second embodiment of the present invention. [Figure 9] FIG. 9 is a perspective view showing a T-joint structure of a hanging lug using the convex strip member of FIG. 8. [Figure 10] FIG. 10 is an enlarged perspective view for explaining general beam welding of the T-joint structure using the convex strip members of FIGS. 8 and 9. [Figure 11] FIG. 11 is an enlarged perspective view illustrating a modified example of FIG. 10 that is specialized for the hanging lug, and is used to explain beam irradiation in an oblique direction. [Figure 12] FIG. 10 is an enlarged perspective view for explaining beam welding to a T-joint structure using the convex strip members of FIGS. 8 and 9. [Figure 13] FIG. 10 is an enlarged cross-sectional view of a main part of a modified example of the convex strip members of FIGS. 8 and 9, in which the cross section is formed into a triangular shape. [Figure 14] FIG. 11 is a perspective view of an assembly configuration in which a hanging lug is welded to a flat plate by applying a T-joint structure according to a third embodiment of the present invention. [Figure 15] 15 is an enlarged cross-sectional view of a main part for explaining a joint indicated by a broken line in FIG. 14. FIG. [Figure 16] 16 is an enlarged cross-sectional view of a main part of a modified example of the convex strip member shown in FIG. 15, in which the cross section of the convex strip member is formed into a triangular shape. FIG. [Figure 17] FIG. 17 is an enlarged cross-sectional view of a main part of a reinforcement example of the structure shown in FIGS. 15 and 16. DETAILED DESCRIPTION OF THE INVENTION

[0010] Each embodiment will be described below with reference to the drawings. Embodiment 1 will be described with reference to Figs. 1 to 3 and Fig. 7 (modification). Embodiment 2 will be described with reference to Figs. 8 to 12 and Fig. 13 (modification). Embodiment 3 will be described with reference to Figs. 14 to 15, Fig. 16 (modification) and Fig. 17 (reinforcement example). A comparative example will be described with reference to Figs. 4 to 6. [Example]

[0011] Fig. 1 is a perspective view of an assembly configuration in which a T-joint structure according to a first embodiment of the present invention (hereinafter also referred to as "this structure") is applied to weld a hanging ear 2 to a housing 3. As shown in Fig. 1, the housing 3 that mainly constitutes the railway vehicle electrical equipment 1 is equipped with a power unit (not shown) necessary for power control, etc. Fig. 1 shows a case in which there are four hanging ears 2, but the number of hanging ears 2 is not limited to four.

[0012] Figure 2 is an enlarged perspective view for explaining the joints in the assembly configuration of Figure 1. As shown in Figure 2, the upper part is a front perspective view, and the lower part is a rear perspective view. A convex strip 6 is provided at the end of the vertical plate 5 along the surface where the hanging ear 2 contacts the flat plate 4 (hereinafter referred to as the "upper surface," "horizontal plate 4," or "flat plate") that forms the upper surface of the housing 3.

[0013] Fig. 3 is an enlarged cross-sectional view of a main part for explaining the joint indicated by the broken line in Fig. 2. The end of the protrusion 6 formed on the vertical plate 5 shown in Fig. 3 was melted by irradiating the protrusion 6 with an electron beam. melt The vertical plate 5 is joined to the flat plate 4 by a weld metal 7. Due to the nature of beam welding, the molten metal gathers at the position where the electron beam is irradiated, so the ideal structure is one in which the weld metal 7 is raised higher than the surface opposite the contact surface of the protrusion 6.

[0014] Here, a comparative example will be described using Figs. 4 to 6. The effects obtained in Example 1 will be described by comparing with the comparative example. Fig. 4 is a perspective view of an assembly configuration in which a T-joint structure according to the comparative example is applied to weld the hanging ear 2 to a flat plate 4. Figs. 4 and 5 show the joint between the hanging ear 2 and the flat plate 4 in the comparative example. Unlike Example 1, the comparative example does not have a convex rib 6 on the vertical plate 5 of the hanging ear 2.

[0015] 5 and 6 show schematic cross-sectional views of the joint between the vertical plate 5 and the flat plate 4 in the comparative example. Fig. 5 is an enlarged cross-sectional view of a main part when arc welding is applied to the joint indicated by the dashed line in Fig. 4. Fig. 6 is an enlarged cross-sectional view of a main part when beam welding is applied to the joint indicated by the dashed line in Fig. 4. As shown in Fig. 5, manual arc welding allows welding to be performed from an oblique angle even with the structure of the comparative example, so that the vertical plate 5 and the flat plate 4 can be joined by the weld metal 7 even without the protruding ribs 6.

[0016] On the other hand, beam welding is performed inside a vacuum chamber, so manual welding is not possible. Therefore, it is limited to robotic work from the ceiling of the vacuum chamber, that is, work using electron beam irradiation from directly above, as shown in Figure 6. Therefore, with the current structure shown as a comparative example in Figure 6, joining by beam welding is difficult.

[0017] Furthermore, when the vertical plate 5 and the flat plate 4 are directly joined by arc welding as shown in Fig. 5, the L-shaped portion 8, which is a stress concentration portion, is mostly supported by the weak weld metal 7, which raises concerns about the weakness of the joint strength. To solve these problems, a structure was introduced in which a protruding strip 6 is provided on the vertical plate 5 of the hanging ear 2, as shown in Example 1 in Figs. 1 to 3.

[0018] With this structure, the end of the ridge 6 can be melted by irradiating it with an electron beam from directly above, firmly joining the hanging lug 2 and the flat plate 4. That is, the structure of Example 1 in which the ridge 6 is provided on the vertical plate 5 can position the weld metal 7 away from the L-shaped portion 8, preventing a decrease in joining strength. Furthermore, because the ridge 6 is melted to form the weld metal 7, undercut due to a lack of weld metal 7 can be suppressed.

[0019] In the schematic diagram of the cross section of the joint between the vertical plate 5 and the flat plate 4 shown in Fig. 3, the cross section of the ridge 6 is rectangular, but the present invention is not limited to this. Fig. 7 is an enlarged cross section of a main part of a modified example in which the cross section of the ridge 6 in Fig. 3 is inclined. As shown in Fig. 7, the same effect can be obtained even if the cross section of the ridge 6 is, for example, triangular.

[0020] Next, a manufacturing method of the hanging ear 2 will be explained. The hanging ear 2 of the comparative example is often manufactured by bending a metal plate. On the other hand, the hanging ear 2 of Example 1 can be manufactured by first providing a protruding rib 6 by machining as an additional process on the same one as the comparative example manufactured by bending a metal plate. Furthermore, there is also a manufacturing method for the hanging ear 2 of Example 1 in which a protruding rib 6 cast in a separate process is attached. [Example]

[0021] Example 2 will be described with reference to Figures 8 to 12 and Figure 13 (modified example). In Figures 8 and 9, the upper part is a front view and the lower part is a rear view. Figure 8 is a perspective view for explaining welding of the hanging ear 2 and the housing 3 (see Figure 1) by applying a T-joint structure using a horseshoe-shaped (U-shaped) convex strip member according to Example 2 of the present invention. As shown in Figure 8, in order to manufacture the hanging ear 2 provided with the convex strip 6, a horseshoe-shaped convex strip member 9 is prepared in addition to the hanging ear 2 of the comparative example.

[0022] Figure 9 is a perspective view showing the T-joint structure of the hanging lug 2 using the convex strip member 9 of Figure 8. As shown in Figure 9, preliminary processing is beneficial in which the convex strip member 9 is arranged at the position where the convex strip 6 of the hanging lug 2 is to be provided. This preliminary processing will be explained as a method of joining the hanging lug 2 and the convex strip member 9 by beam welding with reference to Figures 10 and 11. The benefit of this preliminary processing is that even if only one large housing 3 can be accommodated in the space that can be accommodated in a vacuum chamber or the like, a considerable number of small hanging lugs 2 can be accommodated, and a large number of preliminary processing can be carried out simultaneously in one unit process of evacuation.

[0023] Figure 10 is an enlarged perspective view for explaining general beam welding for the T-joint structure using the convex strip members of Figures 8 and 9. As shown in Figure 10, normal beam welding is limited to construction from directly above, so the vertical plate 5 becomes an obstacle and the vertical plate 5 and the convex strip member 9 cannot be joined.

[0024] However, in the mass production of products using a suspended fixed type housing 3, a large number of hanging lugs 2 are required, so a production method in which a large number of hanging lugs 2 that have been pre-processed collectively are sequentially welded to the housing 3 is effective. Therefore, by adopting a special pre-processing process specialized in joining the hanging lugs 2 and the convex strip members 9 in mass production, production efficiency can be improved.

[0025] Figure 11 is an enlarged perspective view illustrating a modified example of Figure 10 that specializes in the hanging lug 2, and is used to explain beam irradiation in an oblique direction. That is, by arranging multiple hanging lugs 2 on an inclined stage, the workpiece can be tilted as shown in Figure 11, and therefore the hanging lug 2 and the convex strip member 12 can be joined by processing with an electron beam from directly above. In this way, the preliminary processing of joining the convex strip member 9 to the hanging lug 2 of the comparative example makes it possible to efficiently mass-produce hanging lugs 2 provided with convex strips 6.

[0026] Figure 12 is an enlarged perspective view for explaining beam welding of the T-joint structure using the convex strip members of Figures 8 and 9. As shown in the cross section of the joint between the vertical plate 5 and the flat plate 4 in Figure 12, the vertical plate 5 and the flat plate 4 of the hanging ear 2 can be joined by melting the end of the convex strip 6 with an electron beam. According to this structure, there is no need to use machining or casting in combination in the manufacture of the hanging ear 2 provided with the convex strip 6.

[0027] In Fig. 12, the cross section of the convex strip member 9 is rectangular, but the present invention is not limited to a rectangle. Fig. 13 is an enlarged cross-sectional view of a main part of a modified example in which the cross section of the convex strip member of Figs. 8 and 9 is formed into a triangular shape. For example, as shown in Fig. 13, the same effect can be obtained even when the cross section of the convex strip member 9 is formed into a triangular shape. [Example]

[0028] Example 3 will be described using Figures 14 to 16. Figure 14 is a perspective view of an assembly configuration in which a hanging ear 2 is welded to a flat plate by applying a T-joint structure according to Example 3 of the present invention. In particular, Figures 15 and 16 show enlarged schematic diagrams of the joint between the hanging ear 2 and the housing 3. Example 1 is characterized in that a convex strip 6 is provided on each of the vertical plates 5 arranged on the left and right of the hanging ear 2, whereas Example 3 is characterized in that one convex strip 6 is provided on each of the left and right vertical plates 5.

[0029] Fig. 15 is an enlarged cross-sectional view of a main part for explaining the joint indicated by the dashed line in Fig. 14. As shown in Fig. 15, in Example 3, the ends of the ridges 6 located on the outer sides of the two vertical plates 5 are melted, and the two vertical plates 5 and the flat plate 4 are joined by the weld metal 7.

[0030] Although the cross-sectional shape of the end of the ridge 6 is rectangular, it is not limited to a rectangle. Fig. 16 is an enlarged cross-sectional view of a main part of a modified example in which the cross section of the ridge member is formed into a triangular shape compared to Fig. 15. For example, as shown in Fig. 16, the same effect can be obtained even when the end of the ridge 6 is formed into a triangle.

[0031] Figure 17 is an example of reinforcement for the structures shown in Figures 15 and 16, and is an enlarged cross-sectional view of the main part. Figures 15 and 16 show examples in which only the ends of the ridges 6 are welded, and the range of the joining area is smaller than in Examples 1 and 2, so a decrease in joining strength is expected. Therefore, if joining strength becomes an issue, as shown in Figure 17, a seam weld is placed between the ends of two ridges 6 by applying a beam from directly above. This ensures sufficient joining strength.

[0032] [Supplementary Note 1] Under the floor of a railway vehicle, a housing 3 is installed that houses railway vehicle electrical equipment 1, such as a vehicle drive control device that controls the power supplied to the drive motor, an auxiliary power supply unit that controls the power supplied to on-board electrical equipment such as air conditioning, and a safety device that houses maintenance terminals. This housing 3 is made up of multiple members manufactured by bending sheet metal, and these members are joined by various types of welded joints such as T-joints and lap welded joints.

[0033] Arc welding is commonly used as a means of joining these welded joints. However, because arc welding has a low energy density, a lot of heat is conducted to the housing 3 during welding. As a result, the housing 3 becomes hot during welding, and when it is cooled to room temperature after welding, welding distortion occurs in the components that make up the housing 3, resulting in unevenness on the surface of the housing 3. This requires a distortion relief process to remove the unevenness that occurs on the surface of the housing 3 after welding, which requires a lot of processing time.

[0034] Therefore, with the aim of reducing the amount of strain relief work, it has been considered to use beam welding, which has a higher energy density than arc welding, to weld the casing 3. Because beam welding has a high energy density, welding can be completed in a short time and the amount of heat transferred to the casing 3 can be reduced. This makes it possible to keep the temperature of the casing 3 low during welding and suppress the occurrence of welding strain after welding is complete.

[0035] However, beam welding offers less flexibility in welding procedures than arc welding. The main reason is that while arc welding can be done manually, beam welding, especially electron beam welding, requires welding to be done in a vacuum chamber, making it impossible to do it manually and requiring robots. Also, even with laser beam welding, which can be done in the atmosphere using shielding gas, the system configuration for moving the drive system of the beam emission unit to proceed with welding is large-scale, even though it does not have the same restrictions as a vacuum chamber.

[0036] On the other hand, the T-joint structure described in Patent Document 1 requires construction from the inside of the housing 3, which necessitates a design change on the housing 3 side to perform beam welding. Therefore, it is necessary to develop a structure that can be constructed from the vertical plate 5 side of the T-joint, similar to arc welding. It is particularly envisioned that this will be applied to the housing 3 of a power conversion device mounted on a railway vehicle.

[0037] Furthermore, when welding aluminum alloys, which are difficult to weld, in addition to steel and stainless steel, the energy density of the electron beam must be increased, necessitating the selection of an electron gun with a high acceleration voltage. This increases the size of the electron gun, making it difficult to operate using a robot, and therefore limits the operation of the electron gun to movement along the flat plate 4. In other words, the processing position using the electron beam is limited to directly below the electron gun.

[0038] As a result, in existing T-joints, fillet welding can no longer be performed with beam welding, whereas with conventional manual welding, fillet welding can be performed by tilting the welding rod. To solve this problem, the introduction of this T-joint structure makes it possible to join using a welding method in which an electron beam or the like is dropped onto the T-shaped weld from an electron gun or the like installed on the ceiling surface of a vacuum chamber or the like. This effect can be obtained not only with electron beam welding, but also with laser beam welding.

[0039] In addition, the provision of the ridges 6 ensures that the weld metal 7 is secured, preventing undercut that occurs due to a shortage of the weld metal 7. Furthermore, the provision of the ridges 6 allows the weaker welded portion to be separated from the L-shaped portion 8, which is a stress concentration portion of the T-joint.

[0040] [Supplementary Note 2] The following describes suitable applications and advantages of this structure, method, and production method. For example, there was a manufacturing problem with the housing 3 of the electrical equipment 1 for railway vehicles. With conventional arc welding, it was possible to freely position the suspension lug 2 on the housing 3 and join it by welding from the outside of the housing 3.

[0041] When manufacturing a T-joint using beam welding, if an aluminum alloy with poor weldability is selected as the welded object, electron beam welding requires a large electron gun, which makes it difficult to perform the work while tilted, and is limited to work from directly above. This makes it difficult to join existing T-joints consisting of two vertical and horizontal plates, as shown in Figure 6.

[0042] This structure is realized as follows: A ridge 6 is provided at the end of the vertical plate 5 in the longitudinal direction along the horizontal plate 4. As a result, even if beam welding is limited to work from directly above, as shown in Figure 10, the vertical plate 5 and horizontal plate 4 are combined in a T shape, and the beam can be accurately irradiated onto the ridge 6 located at the back of the L-shaped portion 8 of the inverted T-shape.

[0043] Therefore, with this structure, even assembly shapes that would have been difficult to achieve in the past can be accurately joined in a T-shape via the beam-irradiated convex strip 6. Furthermore, with this structure, the weld is spaced away from the L-shaped portion 8 where stress is concentrated between the vertical plate 5 and the horizontal plate 4, ensuring a certain distance, and as shown in Figure 13, the L-shaped portion 8 can be supported by the weld metal 7 that is fixed in a flared shape, ensuring the joining strength of the L-shaped portion 8.

[0044] The T-joint structure (present structure) according to the embodiment of the present invention can be summarized as follows. [1] This structure is a T-joint structure with a welded section where the end face of a vertical plate 5 and the surface of a horizontal plate 4 are butted together in a T-shape and welded. That is, in a T-joint consisting of one body to be welded and another body to be welded, a ridge is provided on the end of the body to be welded on the vertical plate side so that it fits along the body to be welded on the horizontal plate 4 side, and the end of the ridge is melted with weld metal to join the two bodies to be welded.

[0045] In this structure, a ridge 6, either integral with or separate from the vertical plate 5, is provided along the longitudinal direction of the weld. After melting, part or all of this ridge 6 solidifies as weld metal 7, welding the weld. Furthermore, the weld metal 7 after welding is raised outside the exposed surface of the outer surface of the ridge 6 before welding that is not in contact with the horizontal plate 4, creating an ideal weld shape.

[0046] As shown in Example 1 in Figure 3, by providing a structure in which a ridge 6 is provided on a vertical plate 5, the weld metal 7 can be placed away from the L-shaped portion 8 (Figure 5), preventing a decrease in joint strength. Furthermore, because the ridge 6 is melted to form the weld metal 7, undercut due to a lack of weld metal 7 can be suppressed.

[0047] [2] In the above [1], as shown in Figure 3, it is preferable that the exposed surface of the outer surface of the ridge 6 before welding, which is not in contact with the horizontal plate 4, has a surface parallel to the contact surface. Such a horizontal surface of the ridge 6 makes it easier for the beam radiation hanging down to hit the weld when the vertical plate 5 is set upright on the horizontal plate 4 in an inverted T shape, so a precise and high-quality welding finish can be expected.

[0048] [3] In the above [1], as shown in Fig. 7, it is preferable that the exposed surface of the outer surface of the ridge 6 before welding, which is not in contact with the horizontal plate 4, has a surface that intersects with the contact surface at an acute angle. In this case, by providing the ridge 6 with a triangular cross section at the L-shaped portion 8 (Fig. 5) of the vertical plate 5, even a small amount of weld metal 7 can be welded so that its base spreads to a location away from the L-shaped portion 8 (Fig. 5), which efficiently prevents a decrease in joint strength.

[0049] [4] In the above [2] or [3], the ridges 6 are preferably integrally formed with the vertical plate 5 before welding. In this case, the integrally formed vertical plate 5 is simple and requires a minimum number of parts, which is convenient for production management, etc.

[0050] [5] In the above [4], the ridges 6 are integrally formed by joining a separate member to the vertical plate 5 before welding. In this way, the integrally formed vertical plate 5 is simple and requires a minimum number of parts, which is convenient for production management, etc. Furthermore, since the ridges 6 become the weld metal 7 that solidifies after melting in part or in whole and welds the welded portion, a material with optimal physical properties can be selected.

[0051] [6] In the above [2] or [3], the ridge 6 before welding may be a separate casting that does not belong to either the vertical plate 5 or the horizontal plate 4. In this case, since the vertical plate 5 is not integrally formed, the number of parts increases accordingly, but the ridge 6 becomes the weld metal 7 and welds the welded part, so a material with optimal physical properties can be selected. The ridge 6 made of a separate casting part may be combined with the hanging lug 2 manufactured by bending sheet metal.

[0052] Furthermore, because it is easy to distinguish this from welding T-joints of other structures, in cases where manual arc welding or the like is frequently performed on intricate welds that cannot be beam welded, even if the vertical plate 5 and horizontal plate 4 are the same type and shape, it is possible to appropriately distinguish whether or not weld metal 7 is required depending on the application, which can contribute to production efficiency. For example, if the application requires that the L-shaped portion 8 (Figure 5) be made tough, a separate ridge 6 can be added and assembled before beam welding; otherwise, omitting ridge 6 and using a simpler weld will suffice.

[0053] [7] The welding by any of the present structures [1] to [6] above can be applied to the railway vehicle electrical equipment 1. As an example, the horizontal plate 4 may form the flat plate 4 of the housing 3 of the railway vehicle electrical equipment 1, and the vertical plate 5 may form a part of a plurality of hanging ears 2 that are welded to the flat plate 4 of the housing 3 in a T-joint structure.

[0054] That is, the housing 3 that houses an inverter and the like as the railway vehicle electrical equipment 1 has a flat plate 4 formed from a horizontal and flat horizontal plate 4. It is suspended and fixed to the frame of the railway vehicle by hanging ears 2 that are welded to the flat plate 4 of the housing 3 using a T-joint structure. The hanging ears 2 are also basically metal cubes or rectangular parallelepipeds, and the lower end faces of the vertical plates 5 that form the vertical walls of its exterior are welded to the horizontal plates 4 that form the flat plate 4 of the housing 3 described above, and are used as suspension fixing fittings.

[0055] The welding method for a T-joint according to an embodiment of the present invention (the present method) can be summarized as follows. [8] This method is a welding method for a T-joint having a weld where the end face of a vertical plate 5 and the surface of a horizontal plate 4 are butt-welded in a T-shape.

[0056] In this way, the vertical plate 5 on which a portion of each of the multiple hanging ears 2 is formed is welded to the horizontal plate 4, using the following procedure. First, a ridge 6, either integral with or separate from the vertical plate 5, is provided in a position along the weld portion extending in the longitudinal direction. Then, a portion or all of the ridge 6 melts and solidifies as weld metal 7, welding the weld portion. Meanwhile, the weld metal 7 after welding is raised on the exposed surface of the surface that formed the outline of the ridge 6 before welding, outside the surface that is not in contact with the horizontal plate 4, to complete the welding.

[0057] The railway vehicle production method (present production method) according to the embodiment of the present invention can be summarized as follows. [9] This production method is a method for producing railway vehicles that uses components in which the end faces of vertical plates 5 and the surfaces of horizontal plates 4 are butted together in a T-shape and welded together in a T-joint structure.

[0058] The housing 3, which houses an inverter and the like as the electrical equipment 1 for a railway vehicle, has a flat plate 4 formed from a horizontal and flat cross plate 4. It is suspended and fixed to the frame of the railway vehicle by hanging ears 2 welded to the flat plate 4 of the housing 3 using a T-joint structure. The hanging ears 2 are also basically metal cubes or rectangular parallelepipeds, and the lower end faces of the vertical plates 5 that form the vertical walls of its exterior are welded to the cross plate 4 that forms the flat plate 4 of the housing 3 described above, and are used as suspension fixing fittings.

[0059] In this way, the vertical plate 5 on which a portion of each of the plurality of hanging ears 2 is formed is welded to the horizontal plate 4, following the procedure shown in [8] above. In this production method, the housing 3 housing the inverter, etc. is welded to the plurality of hanging ears 2. By fixing the plurality of hanging ears 2 to the frame of the railway vehicle, the installation and assembly of the relevant parts is completed so that the weight of the housing 3 housing the inverter, etc. can be suspended and the housing can withstand vibrations while the vehicle is running. [Explanation of symbols]

[0060] 1 Electrical equipment for railway vehicles, 2 Hanging ear, 3 Housing, 4 Top surface (horizontal plate), 5 Vertical plate, 6 Convex strip, 7 Welded metal, 8 L-shaped portion, 9 Convex strip member

Claims

1. A T-joint structure having a welded portion in which the end surface of a vertical plate and the surface of a horizontal plate are butted together in a T-shape and welded, A protruding strip is provided along the longitudinal direction of the welded portion, the protruding strip being integral with or separate from the vertical plate; A part or all of the protrusions melt and then solidify to become a weld metal, thereby welding the welded portion, The welded portion is raised so that the weld metal after welding forms a convex shape. T-joint structure.

2. Of the outer surfaces of the convex strips before welding, an exposed surface that is not a contact surface with the horizontal plate has a surface parallel to the contact surface. The T-joint structure of claim 1.

3. Of the outer surfaces of the convex strip before welding, an exposed surface that is not a contact surface with the horizontal plate has a surface that intersects with the contact surface at an acute angle. The T-joint structure of claim 1.

4. The protrusion is integrally formed with the vertical plate before welding. A T-joint structure according to claim 2 or 3.

5. The protruding strip is integrally formed by previously joining a separate member to the vertical plate before welding.

5. A T-joint structure as claimed in claim 4.

6. The convex strip before welding is a separate casting that does not belong to either the vertical plate or the horizontal plate. A T-joint structure according to claim 2 or 3.

7. the horizontal plate forms an upper surface of a housing for an electrical device for a railway vehicle; The vertical plate forms part of a plurality of hanging lugs which are welded to the upper surface of the housing in a T-joint structure. A T-joint structure according to any one of claims 1 to 6.

8. A method for welding a T-joint having a welded portion in which an end face of a vertical plate and a surface of a horizontal plate are butt-welded in a T-shape, comprising the steps of: A protruding strip is provided along the longitudinal direction of the welded portion, the protruding strip being integral with or separate from the vertical plate; A part or all of the protrusions melt and then solidify to become a weld metal, thereby welding the welded portion, The welded portion is raised so that the weld metal after welding has a convex shape. How to weld a T-joint.

9. The convex strip before welding is assembled such that the exposed surface of the outer surface of the convex strip that is not in contact with the horizontal plate is parallel to the contact surface.

9. A method for welding a T-joint according to claim 8.

10. Before welding, the convex strip has an exposed surface, which is not a contact surface with the horizontal plate, intersecting the contact surface at an acute angle with respect to the outer surface of the convex strip.

9. A method for welding a T-joint according to claim 8.

11. The protrusion is integrally formed with the vertical plate before welding. A method for welding a T-joint according to claim 9 or 10.

12. The protruding strip is integrally formed by previously joining a separate member to the vertical plate before welding.

12. A method for welding a T-joint according to claim 11.

13. The convex strips, which are separate castings that do not belong to either the vertical plate or the horizontal plate, are combined and welded. A method for welding a T-joint according to claim 9 or 10.

14. The horizontal plate forms an upper surface of a housing for an electrical device for a railway vehicle; The vertical plate forms a part of a plurality of hanging ears welded to the upper surface of the housing in a T-joint structure. A method for welding a T-joint according to any one of claims 8 to 13.

15. A member is used in which the end face of a vertical plate and the surface of a horizontal plate are butted together in a T-shape at the welded portion, forming a T-joint structure.

1. A method for producing a railway vehicle, comprising the steps of: The top surface of the housing containing the electrical equipment for railway vehicles is formed by horizontal plates, In order to weld a vertical plate on which a portion of a plurality of hanging lugs is formed to the upper surface of the housing in a T-joint structure, A protruding strip is provided along the welded portion extending in the longitudinal direction, the protruding strip being integral with or separate from the vertical plate; A part or all of the protrusions melt and then solidify to become a weld metal, thereby welding the welded portion; The welded portion is raised so that the weld metal after welding has a convex shape. How rail cars are produced.

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