JP2009154194A - Lap laser welding method and lap laser welding joint for railway vehicle body, and railway vehicle body structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure a sufficient joining strength by applying laser welding linearly on an overlapped portion of vertical and horizontal skeleton members in a short welding length area. <P>SOLUTION: Laser welding is applied on a plurality of plate members 1, 2, 11 overlapped in the short welding length area 23 of a railway vehicle body structure 41 so that the penetration reaches either through the thickness or within the thickness of an exterior plate 3. To achieve the objective, the laser beam LB is continuously irradiated while scanning along a spiral line for more than one rotation so as to perform laser weld 6 in a spiral form in the short welding length area 23. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for lap laser welding of a structure of a railway vehicle, a lap laser welding joint using the method, and a structure of a railway vehicle.

  The structure structure of a railway vehicle in which one end of a bone arranged vertically and horizontally has a relationship facing the other side surface and is welded to the outer plate is originally as shown in FIGS. 8 (a) and 8 (b). In addition, at the location where the end of the transverse bone b having the hat-shaped cross section faces the side surface of the longitudinal bone a having the hat-shaped cross section, the other flange b1 is superimposed on the one flange a1. Then, spot welding was performed on the outer plate c including the overlapping portion at the welded portion d (see, for example, Patent Document 1). In this case, a joint plate e called a gusset as shown by phantom lines in FIGS. 8A and 8B is applied and spot welded at a welded joint d to obtain a required strength. I am doing so.

However, in spot welding, welding is performed with a load of, for example, 1 t, so that the impression appears on the outer surface and the appearance is poor, and it takes time and effort to join, resulting in high costs. Then, it is also conceivable to perform laser welding as shown by a thick line f in FIGS. 7A and 7B (see, for example, Patent Document 2). However, since the penetration width is narrow in laser welding, there is no advantage of continuous joining at the ends of the bones a and b, and it is considered that a concentration force is likely to work at the end of the laser welded part f. Adoption of the joint plate e is indispensable and is still expensive. Moreover, in order to weld and join the joint plate e by laser welding, the overlapping region g with the flange a is relatively long, and sufficient joining strength can be obtained even if the laser welding g1 is performed in a simple line shape. Since the overlapping areas h and i with the flanges a1 and b1 are non-long surface areas, the laser welding h1 and i1 can be performed not only in a straight line but also in a circular line known from Patent Document 3.
Japanese Patent Laid-Open No. 9-30414 JP 2006-341813 A JP 2006-27366 A

  However, even if laser welding is performed not only in a straight line but also in a substantially circular line, the weld line length is short and the joint strength cannot be sufficiently increased. As disclosed in FIG. 6 disclosed in Patent Literature 2, welding is applied to both the end of one bone b joined to the outer plate c by laser welding f and the outer plate c across the other bone a. As a result, the entire end of one bone b has a welded joint structure to the outer plate c while allowing continuous laser welding f to the outer plate c of the vertical and horizontal bones a and b. The two bones are overlapped under the other bone in the form of material dynamics and welded to the other bone welded to the outer plate c, so that while increasing the joint strength of the vertical and horizontal bones a and b, In order to prevent stress from concentrating on the end of the bone, the overlap of the vertical and horizontal bones a and b also forms a non-long surface area j, which can be dealt with by spot welding j1 or plug welding j2, but laser welding In addition to fusing with f, spot welding requires pre-joining before welding with the outer plate c. There to, but not such a restriction in the plug welding, time-consuming in welding on a work to fill the required range. If this is replaced by laser welding j3, the linear shape shown in FIG. 6 or the circular shape shown in FIG. 7 is obtained, and the weld line has a short length and the joint strength cannot be sufficiently increased.

  An object of the present invention is to provide a method of overlapping laser welding of a railway vehicle structure capable of satisfying sufficient joint strength by linearly laser-welding overlapping portions of vertical and horizontal bones in a non-long surface area, and overlapping using the same. The object is to provide a laser welded joint and a structure of a railway vehicle.

  In order to achieve the above-described problems, the method of overlapping laser welding of a railway vehicle structure according to the present invention allows a plurality of plate members overlapping in a non-long surface area in the railway vehicle structure to be attached to the outermost surface plate. A lap laser welding method in which laser welding is performed so that the penetration penetrates or does not penetrate, and a laser beam is continuously irradiated in the non-long surface area while scanning so as to draw a spiral line exceeding one layer, and a spiral It is characterized by linear laser welding.

  Such a method is a lap laser welded joint in which a plurality of plate members overlapping in a non-long surface area in a railway vehicle structure are laser welded so that the penetration into the outermost plate penetrates or does not penetrate, In the non-long surface area, a laser beam is continuously irradiated while scanning so as to draw a spiral that exceeds a single layer, and a lap laser welding joint is realized, which is laser-welded in a spiral shape Thus, a structure of a railway vehicle using this can be obtained.

  In such a configuration, in order to weld and join the overlapping portions of the plurality of plate members in the non-long surface area by laser welding, the laser beam is continuously irradiated while scanning so as to draw a spiral line exceeding one layer. Since laser welding is performed in a spiral shape, welding is ensured regardless of whether penetration is penetration or non-penetration, and welding is performed more than in the case of circular linear laser welding in which only the spiral line exceeding one layer is closed. The line length becomes longer.

  For the spiral line, one of a circle, an ellipse, an oval, and a square is selected.

  In such a configuration, for example, the constant velocity is preferentially obtained in the order of substantially circular, elliptical, oval, and rectangular, and the non-long surface is rectangular in the order of substantially rectangular, elliptical, elliptical, and circular. The longest weld line in the region is preferentially obtained.

  Further, the spiral lines are set so that the overlap is the same number of point symmetry in any direction around the center.

  In such a configuration, the joint strength of the lap laser welding can be made uniform around the center of the spiral.

  In the case of a lap laser welded joint, the weld joint between the outer plate and the reinforcing material inside thereof is a non-penetrating laser weld joint that does not penetrate the outer plate from the inside.

  In such a configuration, when the overlap laser welding does not reach the outer plate, priority is given to the overlap laser welding through which the penetration penetrates, and when the overlap laser welding reaches the outer plate, the overlap laser welding without penetration does not occur. Priority can be given.

  According to the lap laser welding method, the lap laser welding joint, and the railway vehicle structure of the railway vehicle structure according to the present invention, the laser beam welding is used to weld and join the overlapping portions in the non-long surface areas of the plurality of plate members. A plurality of plate members are welded and joined to the outer plate of the railway vehicle structure and each reinforcement member welded and joined to the inside of the railcar structure, and to the outer plate. No matter which combination of reinforcing materials to be welded to each other, reinforcing materials to be welded to the outer plate and mutual reinforcing materials to connect them, laser welding in a spiral shape and penetration of penetration, Regardless of non-penetration, the length of the weld line becomes longer and the joint strength can be increased than in the case of the circular linear laser welding in which only the spiral line exceeding the single layer is closed. In addition, since the welding continuity is ensured, the welding speed can be stabilized stably, the depth and width of the penetration can be made constant, and the joining strength can be prevented from varying, and a highly reliable lap joint structure can be obtained.

  For example, the spiral is preferentially obtained in the order of selection of substantially circular, elliptical, oval, rectangular, and is advantageous in stabilizing the lap laser welding, and is substantially rectangular, elliptical, elliptical. In addition, the longest weld line in the rectangular non-long surface area is preferentially obtained in the order of circular selection, which is advantageous in improving the joint strength of the lap laser welding.

  In addition, the spirals have the same number of point symmetry in any direction around the center, and the joint strength of the lap laser welding is equalized around the center of the spiral, and the stress due to the load varies around the center. Inconvenience can be prevented.

  In the case where overlap laser welding does not reach the outer plate, priority is given to overlap laser welding through which penetration penetrates, and it is advantageous for improving the joint strength, but when overlap laser welding is applied to the outer plate, overlap laser that does not penetrate through. Prioritizing welding, it can be advantageous to maintain aesthetics so that the penetration does not reach the outer surface of the skin.

  Embodiments relating to the structure of a railway vehicle structure according to the present invention will be specifically described with reference to FIGS. 1 to 5 to provide an understanding of the present invention.

  The overlap laser welding method for the structure of a railway vehicle structure according to the present embodiment is similar to the example shown in FIG. 1 and the example shown in FIG. Has a relationship facing the side surface of the other bone 1 and is welded to the outer plate 3 to form a side structure 41 of a railway vehicle as shown in FIG. 21, as in the example shown in FIG. 3, the ends 2 a of one bone 2 of the bones 1 and 2 arranged vertically and horizontally are welded to the outer plate 3 so as to face the side surface of the other bone 1. Further, depending on the location, the bones 1 and 2 and the bones 1 and 2 and the outer plate 3 are welded together by the joint plate 11 to form a side structure 41 of the railway vehicle as shown in FIG. This is applied to the case of 3 reinforcement.

  However, the present invention is not limited to this, and in order to weld and join the overlapping portions of the plurality of plate members in the non-long surface area by laser welding, the plurality of plate members are connected to the outer plate of the “1” railway vehicle structure. Mutual reinforcement with one reinforcing material welded to the inside, "2" outer plate and a plurality of reinforcing materials welded to the inside, "3" Multiple reinforcements welded to the outer plate The present invention can be applied to any combination of materials, such as a mutual relationship between a plurality of reinforcing materials welded to a “4” outer plate and a reinforcing material connecting them.

  In the example of FIG. 1 and the example of FIG. 2, the other bone 1 is applied across the end 2 a of one bone 2 welded to the outer plate 3 by the welded joint 5 and the outer plate 3. The bone 1 is welded and joined at weld joints 6 and 4. In this way, by connecting the other bone 1 across the end 2a of the one bone 2 welded to the outer plate 3 and the outer plate 3, the other bone 1 is welded to both, and thereby the vertical and horizontal bones 1, The entire end 2a of one bone 2 has a welded joint structure to the outer plate 3 so that continuous laser welding to the second outer plate 3 is allowed, and both material mechanics are under the other bone 1. Since it has a closed structure that is welded and joined to the other bone 1 welded and joined to the outer plate 3, the joint strength of the longitudinal and transverse bones 1 and 2 is increased. However, it is possible to prevent stress from concentrating on the end 2a of one bone 2.

  As described above, the welding between the vertical and horizontal bones 1 and 2 is sufficiently performed by plug welding using the through-hole provided in the bone 1 that is on the upper side, such as the welded joint portion 6 shown in FIGS. Welding and joining with joining strength can be obtained easily and reliably, and instead of this, lap laser welding or spot welding can be adopted. However, in order to guarantee the necessary joint strength in spot welding or lap laser welding, it is preferable to perform welding joining at a plurality of locations and at a plurality of lines. In addition, the overlap laser welding of the vertical and horizontal bones 1 and 2 with the outer plate 3 has a welding depth of 0.1 mm to about 50% of the thickness of the outer plate 3 due to weld joint strength and appearance problems. Non-through welding is preferable.

  As a result, the entire end 2a of one bone 2 of the vertical and horizontal bones 1 and 2 to be welded to the outer plate 3 has a welded joint structure to the outer plate 3, and both of them are under the other bone 1. A simple and inexpensive joint that is overlapped in a material dynamic three-dimensional shape, that is, the end 2a of one bone 2 is welded and joined to the other bone 1 in the middle of the continuous laser welded portion. It is possible to prevent stress from concentrating on the end 2a of one bone 2, particularly the end of the laser weld joint, while increasing the joint strength of the longitudinal and lateral bones 1 and 2 regardless of the welding method. it can. In addition, since the continuous weldability of the vertical and horizontal bones 1 and 2 to the outer plate 3 is not impaired, it is easier and more simple by overlap laser welding as in the weld joints 4 and 5 indicated by the continuous thick lines in FIGS. This is preferable because it can be realized with high productivity. Moreover, it is also suitable for welding the bones 1 and 2 made of stainless steel plate to the outer plate 3 made of stainless steel plate.

  More specifically, one of the bones 2 has a hat-shaped cross section as shown in the example of FIG. 1 and the two flanges 2b and 2b are applied to the outer plate 3 and welded by laser welding. The other bone 1 has a hat-shaped cross section as in the example of FIG. 1 or a Z-shaped cross section as in the example of FIG. 2, and straddles the end 2a of one bone 2 and the outer plate 3, The flanges 1b and 1b on both sides are individually applied to them, and the end 2a of one bone 2 is welded and joined by one of the laser welding, spot welding, or plug welding described above, Welding is performed by lap laser welding or spot welding. As a result, the vertical and horizontal bones 1 and 2 are joined to the outer plate 3 by overlapping laser welding, and the vertical and horizontal bones 1 and 2 are joined to each other, the outer plate 3 is joined, and their mechanical shapes are It is possible to improve the strength of the joint and the joint strength.

  In the example shown in FIG. 3, the lap laser welded joint 22 having the conventional structure described with reference to FIG. 7 is employed, and a hat-shaped cross section is provided on the side surface of the longitudinal bone 1 having a hat-shaped cross section. At the place where the end 2a of the transverse bone 2 is opposed, the other flange 2b is overlapped on one flange 1b, and the outer plate 3 including the overlapping portion is welded to the outer plate 3 by the welded portions 4 and 5. In addition to the lap laser welding, a joint plate 11 called a gusset as shown by the phantom line is applied, and welding is performed by lap laser welding, spot welding, or plug welding at the weld joint 6. I try to get strength. In this case, it is preferable that the overlap laser welding and the plug welding at the weld joint 6 extend to the outer plate 3 in terms of joint strength.

  However, in any of the example of FIG. 1, the example of FIG. 2, and the example of FIG. 3, the weld joint 6 becomes a non-long surface area 23 of a plurality of plate members as shown in the drawing, and is narrow, straight or circular. In the overlap laser welding with a wire, the length of the weld wire cannot be taken sufficiently and it is difficult to increase the joint strength. If you try to increase the joint strength by increasing the number of welding lines with straight lines or circular lines, the number of welds will increase and it will take time, and there will be many welding start and end points and the distance between the start and end points will be short. , It is difficult to stabilize the welding speed, the penetration depth and width are likely to vary, and when the start point and end point are separated from each other in the circular line, a part that does not overlap is generated locally, and when the start point and end point are overlapped, it is more than the other parts Since the depth and width of the penetration increase locally, the variation in the depth and width of the penetration around the center is further promoted.

  Therefore, in the present embodiment, a laser beam is formed in the non-long surface area 23 as in the example shown in FIG. 1, the example shown in FIG. 2, and the weld joint 6 shown as a representative example in the example shown in FIG. 3. The beam LB is continuously irradiated while scanning so as to draw a spiral line exceeding a single layer, and laser welding is performed in a spiral pattern. Such a method includes, for example, the example shown in FIG. 1, the example shown in FIG. 2, and the example shown in FIG. 3, and the non-long surface area in the side structure 41 shown in FIGS. 4 and 5. 23, which are overlap laser welded joints 21 and 22 in which a plurality of plate members that overlap each other are welded so that the penetration into the outermost plate penetrates or does not penetrate. The laser beam LB is continuously irradiated while scanning so as to draw more than a single spiral line, and laser welding is performed in a spiral shape to realize lap laser welded joints 21 and 22, which are used. A structure structure such as a side structure 41 of a railway vehicle that has been used can be obtained.

  Thus, in order to weld and join the overlapping portions of the plurality of plate members in the non-long surface area 23 by laser welding, the laser beam LB is continuously irradiated while scanning so as to draw a spiral line exceeding one layer. Since laser welding is performed in a spiral shape, welding is ensured regardless of whether penetration is penetration or non-penetration, and welding is performed more than in the case of circular linear laser welding in which only the spiral line exceeding one layer is closed. The line length becomes longer.

  As a result, in order to weld and join the overlapping portions of the plurality of plate members in the non-long surface area 23 by laser welding, the plurality of plate members are welded and joined to the outer plate 3 of the railway vehicle structure and the inside thereof. Mutual “1” with the bone 1 or 2 as a material, mutual “2” between the outer plate 3 and the bones 1 and 2 as a plurality of reinforcing members welded to the inside thereof, and welding with the outer plate 3 The bones 1 and 2 as a plurality of reinforcing materials are mutually “3”, and the bones 1 and 2 as the reinforcing materials welded to the outer plate 3 and the joint plate 11 as a reinforcing material for connecting them are mutually “4”. In any combination such as “”, a circular linear laser welding in which only a spiral line exceeding a single layer is closed by laser welding in a spiral shape, regardless of whether the penetration is through the penetration 6a or not. The length of the weld line is longer than the case and the joint strength can be increased. Double and that the multiplexing shown in more become of the example and FIG. 2 in FIG. 1 is suitable, such as. In addition, since the welding continuity is ensured, the welding speed can be stabilized stably, the depth and width of the penetration can be made constant, and the joining strength can be prevented from varying, and a highly reliable lap joint structure can be obtained.

  Here, in addition to the circular shape as shown in FIG. 3, the elliptical shape as shown in FIG. 1, and the elliptical shape as shown in FIG. 2, one of various squares (not shown) can be selected as the spiral. Thereby, for example, constant velocity is preferentially obtained in the order of substantially circular, elliptical, oval, and rectangular, and the example shown in FIG. 1 in the order of substantially rectangular, elliptical, elliptical, and circular, FIG. The longest weld line in the rectangular non-long surface area 23 as shown in FIG. Further, in the case of an irregular shape such as a sector-shaped non-long surface area 23 as shown in FIG. Thus, when the constant velocity property is preferentially obtained, it is advantageous for the stabilization of the lap laser welding, and when the longest property is preferentially obtained, it is advantageous for improving the joint strength of the lap laser welding.

  Moreover, in the example shown in FIG. 1, the example shown in FIG. 2, and the example shown in FIG. 3, the spiral lines are set to have the same number of point symmetry in any direction around the center O. Thereby, the joining strength of the lap laser welding can be made uniform around the center O of the spiral. Therefore, the overlap of the spirals in any direction around the center becomes the same number of point symmetry, the joint strength of the lap laser welding is equalized around the center O of the spiral line, and the stress due to the load varies around the center. Can be prevented.

  Further, in the case of the lap laser welding joint 22 shown in FIG. 3, as shown in FIG. 3 (b), the outer plate 3 is welded and joined to the bone 2 and the joint plate 11 as the reinforcing members on the inside from the outside. This is a non-penetrating laser welding joint that does not penetrate through the plate 3. Accordingly, in the case of the example of FIG. 1 or FIG. 2 in which the overlap laser welding does not reach the outer plate 3, priority is given to the overlap laser welding through which the penetration 6a penetrates as shown in FIG. 1 (b) and FIG. 2 (b). However, when the laser welding is performed on the outer plate 3, the welding 4a shown in FIG. 1 (b), FIG. 2 (b), and FIG. 3 (b) and the penetration 6a shown in FIG. Penetration laser welding that is through can be prioritized. Therefore, when the overlap laser welding does not reach the outer plate 3, the overlap laser welding which penetrates the penetration gives priority to the improvement of the joint strength, while the overlap does not occur when the overlap laser welding reaches the outer plate 3. Preference is given to penetrating lap laser welding, which can be advantageous for keeping the aesthetics so that the penetration does not reach the outer surface of the skin.

  The side structure 41 shown in FIGS. 4 and 5 is of a type in which one opening of the window 43 is provided between the openings of the doorway 42, and the other bone 1 extends along the openings of the window 43 and the doorway 42. The one bone 2 whose end 2a is opposed to the side surface is a lateral bone arranged between the opening of the entrance / exit 42 and the opening of the entrance / exit 42, and the opening of the entrance / exit 42 and the window 43 It is a horizontal bone placed between the opening.

  In railcars, as seen in the side structure 41 shown in FIG. 4, it is widely adopted to reinforce the outer plate 3 through the long transverse bone 2 in the longitudinal direction, and the vertical bone along the opening of the window 43 and the entrance 42. The number of ends 2a facing one side is large, and the joint strength between them and the joint strength to the outer plate 3 are likely to be a problem. To increase the joint strength and joint strength, FIG. The specific example shown in 5 is effective. Moreover, as shown in FIG. 5, the laser weld joint 4 continuous along the openings of the window 43 and the entrance / exit 42 is preferable because it is waterproof against intrusion of rainwater or the like from these openings.

  In the examples shown in FIGS. 4 and 5, the longitudinal bones 1 along the openings of the windows 43 and the entrances and exits 42 have a hat-shaped cross section, and the openings provided in the openings of the windows 43 and the entrances and exits as shown in FIG. 5. Although the frame or the opening frame members 42a and 43a are separated from each other, the joint strength and the joint strength can be improved even with a simple structure in which this is a common member formed integrally.

  In particular, the lateral bones 2 are arranged at substantially equal intervals in the vertical direction through the inner surface of the outer plate 3 except for the windows 43 and the openings 42, and the vertical bones 1 are arranged in the windows 43 and the doors of the outer plate 3. It is arranged along the opening and the side part of 42, and the edge part (not shown) of the outer plate | board 3, and between the longitudinally oriented bones 1, the longitudinally facing reinforcing material 46 is applied to the laterally facing bones 2 from the inside. Joining is performed by a weld joint 47 of any one of plug welding, spot welding, and spiral laser welding. As a result, the surface area through which the transverse bone 2 can pass is arranged in preference to the longitudinal bone 1 to avoid the division of the transverse bone 2 by the longitudinal bone 1 to ensure the continuity of laser welding. However, the vertical bone 1 that is extremely reduced, and the reinforcing material 46 welded and joined by various welding without affecting the outer plate 3 and the appearance, passing vertically to the horizontal bone 2 between the vertical bones 1. The necessary structural strength can be secured. In particular, the reinforcing material is not welded to the outer plate and can be increased in strength against out-of-plane deformation due to the in-plane shear force of the outer plate in a floating state without contact. For this purpose, as shown in the figure, the transverse bone 2 has a hat-shaped cross section, the flanges 2b on both sides thereof are welded to the outer plate 3, and the longitudinal reinforcement 46 has a hat-shaped cross section. It is preferable to have a notch 46b that fits behind the flange 2b of the sideways bone 2 so that the flange 2b of the sideways bone 2 hits its own flange 46a and is welded to the flange 2b.

  INDUSTRIAL APPLICABILITY The present invention can be practically used for a structure of a railway vehicle and a lap weld joint used therefor, which is advantageous in terms of work, cost, strength, and the like.

It is the front view and top view from an inner surface side which show one example of the joining structure of the outer plate | board of the rail vehicle in embodiment of this invention, and the bone distribute | arranged vertically and horizontally. It is the front view and top view from the inner surface side which show another example of the joining structure of the outer plate | board of the railway vehicle in embodiment of this invention, and the bone distribute | arranged vertically and horizontally. It is the front view and top view from the inner surface side which show the other example of the junction structure of the outer plate | board of the rail vehicle in embodiment of this invention, and the bone distribute | arranged vertically and horizontally. It is a front view from the inner surface side which shows the side structure to which the example of joining structure of FIG.1, FIG.2, FIG.3 is applied. It is a cross-sectional view between the window of FIG. 4 and an entrance / exit. It is the front view and top view from the inner surface side which show one example of the welding joint structure of the conventional outer plate and the bone | frame arrange | positioned vertically and horizontally. It is the front view and top view from the inner surface side which show another example of the welding joint structure of the conventional outer plate | board and the bone distribute | arranged vertically and horizontally. It is the front view and top view from the inner surface side which show the other example of the welding joint structure of the conventional outer plate and the bone | frame arrange | positioned vertically and horizontally.

Explanation of symbols

1, 2 Bone 1b, 2b Flange 3 Outer plate 4, 5, 6 Weld 4a, 5a, 6a Penetration 11 Joint plate 21, 22 Lap laser welding joint 23 Non-long surface area 41 Side structure LB Laser beam

Claims (7)

A lap laser welding method in which a plurality of plate members overlapping in a non-long surface area in a railway vehicle structure are laser welded so that the penetration to the outermost surface plate penetrates or does not penetrate,
A lap laser welding method characterized by continuously irradiating a laser beam in the non-long surface area while scanning so as to draw a spiral line exceeding a single layer, and performing laser welding in a spiral pattern. 2. The lap welding method according to claim 1, wherein the spiral wire is substantially circular, elliptical, oval, or square. The lap laser welding method according to any one of claims 1 and 2, wherein the spiral is set so that the overlap is the same number of point symmetry in any direction around the center. A lap laser welding joint in which a plurality of plate members overlapping in a non-long surface area in a railway vehicle structure are laser welded so that the penetration to the outermost plate penetrates or does not penetrate,
In the non-long surface area, a laser beam is continuously irradiated while scanning so as to draw a spiral line exceeding a single layer, and laser welding is performed in a spiral shape. The plurality of plate members are the outer plate of the railway vehicle structure and the reinforcing material welded to the inside, the outer plate and the reinforcing member welded to the inside, the reinforcement welded to the outer plate, the outer plate The lap laser welded joint according to claim 4, wherein the welded joint is a pair of reinforcements joined together and a reinforcement connecting them. The lap laser welding joint according to any one of claims 4 and 5, wherein the welded joint between the outer plate and the reinforcing material inside thereof is a non-penetrating laser welded joint that does not penetrate the outer plate from the inner side. A structure of a railway vehicle using the lap laser welded joint according to any one of claims 4 to 6.

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