JP5052242B2 - Laser welded joint and joined body using the joint - Google Patents

Laser welded joint and joined body using the joint Download PDF

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JP5052242B2
JP5052242B2 JP2007188470A JP2007188470A JP5052242B2 JP 5052242 B2 JP5052242 B2 JP 5052242B2 JP 2007188470 A JP2007188470 A JP 2007188470A JP 2007188470 A JP2007188470 A JP 2007188470A JP 5052242 B2 JP5052242 B2 JP 5052242B2
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surface plate
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JP2009022979A (en
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慶知 渡邉
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Nippon Sharyo Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
    • B23K26/348—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding in combination with arc heating, e.g. TIG [tungsten inert gas], MIG [metal inert gas] or plasma welding

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  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Laser Beam Processing (AREA)

Description

本発明は、押出中空形材同士の端部を突き合わせ、レーザ溶接又はレーザ・アークハイブリッド溶接によって接合するためのレーザ溶接継手および当該レーザ溶接継手によって組み立てられた車両用構体を有する接合体に関する。   The present invention relates to a laser welded joint for butting the ends of extruded hollow members and joining them by laser welding or laser-arc hybrid welding, and a joined body having a vehicle structure assembled by the laser welded joint.

鉄道車両などでは、車体軽量化に対応すべく軽量なアルミニウム合金材による車両構体などが採用され、部材同士がレーザ溶接やレーザ・アークハイブリッド溶接によって接合されている。図４は、下記特許文献１に開示された鉄道車両におけるパネル溶接構造の要部縦断面図である。これは、一対のハニカムパネル１０１が、接合部材１０２に対して上部面板１０３及び下部面板１０４が予めロウ材１０５によって接合して構成されている。そして、接合部材１０２同士は、上下の突き合わせ面がそれぞれレーザ溶接によって接合される。   In railway vehicles and the like, a vehicle structure made of a light aluminum alloy material is adopted to cope with the weight reduction of the vehicle body, and members are joined by laser welding or laser / arc hybrid welding. FIG. 4 is a longitudinal sectional view of an essential part of a panel welding structure in a railway vehicle disclosed in Patent Document 1 below. This is configured by a pair of honeycomb panels 101 in which an upper face plate 103 and a lower face plate 104 are previously joined to a joining member 102 by a brazing material 105. The joining members 102 are joined by laser welding at the upper and lower butted surfaces.

一方、同じくレーザ溶接によって接合を行う下記特許文献２には、図５に示すようなレーザ溶接継手が開示されている。係合凸部２０５と係合凹部２０６が形成され、その嵌め合わせによって接合端部の突合せ状態が維持できるようになっている。そして、突き合わされた溶接突起２０３，２０４の内側には、レーザビームＬの照射方向反対側に裏側空間１０７，１０８が形成されている。そこで、接合時には溶接突部２０３，２０４の突き合わせ部にレーザビームが照射され、裏側空間１０７，１０８にシールドガスが流し込まれてシールドガス雰囲気になる。これにより、裏側空間１０７，１０８内における酸化が防止され、ビード部への酸化物の巻込みを回避した強度低下を阻止できる。
特開平７−８８６４３号公報 特開平８−５７６７０号公報 特開２００７−１２５５７３号公報 On the other hand, a laser welded joint as shown in FIG. 5 is disclosed in the following Patent Document 2, which is also joined by laser welding. Engagement projections 205 and engagement recesses 206 are formed, and the mating state of the joining end portions can be maintained by the fitting. Then, on the inner side of the welded projections 203 and 204 that are abutted with each other, back side spaces 107 and 108 are formed on the side opposite to the irradiation direction of the laser beam L. Therefore, at the time of joining, a laser beam is irradiated to the abutting portions of the welding projections 203 and 204, and a shielding gas is poured into the back space 107 and 108 to create a shielding gas atmosphere. As a result, oxidation in the backside spaces 107 and 108 is prevented, and a decrease in strength that prevents the oxide from being caught in the bead portion can be prevented.
JP-A-7-88643 JP-A-8-57670 JP 2007-125573 A

ところで、特許文献１に記載するレーザ溶接継手は、上下で突き合わされた接合部材１０２，１０２内の空間１１０が大きすぎて、仮にシールドガスを入れてもシールド環境が安定しない。また、図面上方をレーザ溶接している場合に溶滴が落ちた場合や、レーザビームが突き抜けてしまった場合には、反対側の接合部に悪影響を及ぼすことになる。
その一方で、特許文献２のレーザ溶接継手には、裏側空間１０７，１０８が形成されシールドガスが供給される。しかし、直接シールドガスを供給した場合、裏側空間１０７，１０８内の圧力が高くなってしまうと、逆に溶融部にガスが入り込んでブローホールを生じさせてしまう。 By the way, in the laser welded joint described in Patent Document 1, the space 110 in the joining members 102 and 102 that are abutted on each other is too large, and even if a shielding gas is introduced, the shielding environment is not stable. In addition, when a laser droplet is dropped when laser welding is performed on the upper side of the drawing, or when the laser beam penetrates, the joint on the opposite side is adversely affected.
On the other hand, backside spaces 107 and 108 are formed in the laser welded joint of Patent Document 2 and a shielding gas is supplied. However, when the shielding gas is directly supplied, if the pressure in the backside spaces 107 and 108 becomes high, the gas enters the melted part and causes blowholes.

その点、上記特許文献３には、本出願人が提案した図６に示す押出中空形材３０１，３０２の溶接継手が開示されている。これは、重ね合わせた突起３１１，３１２の間に、突起３１２側に形成した溝３１５からなる裏側空間が形成され、開先３１３に行われるレーザ・アークハイブリッド溶接に際してシールドガスがレーザビームＬと同方向から吹き付けられ、溝３１５の裏側空間にシールドガス雰囲気をつくっている。しかし、この溶接継手の裏側空間は、容積が小さいため圧力が高くなってしまうおそれがあり、また、接合位置が溝３１５の端になるためシールドガスが流れにくいことも考えられる。更に、接合部は片側のみが突起３１１になっているため、熱伝導率の高いアルミなどでは左右の熱分散に偏りが生じて溶接品質を低下させることが懸念される。   In that regard, Patent Document 3 discloses a welded joint of extruded hollow members 301 and 302 shown in FIG. 6 proposed by the present applicant. This is because a back side space consisting of a groove 315 formed on the projection 312 side is formed between the superimposed projections 311, 312, and the shield gas is the same as that of the laser beam L in the laser-arc hybrid welding performed on the groove 313. Sprayed from the direction, a shielding gas atmosphere is created in the space behind the groove 315. However, the back side space of the welded joint has a small volume and may increase the pressure. Also, since the joining position is at the end of the groove 315, the shield gas may not flow easily. Furthermore, since only one side of the joint portion is a projection 311, there is a concern that the heat distribution on the left and right sides of the aluminum having high thermal conductivity is uneven and the welding quality is deteriorated.

そこで、本発明は、かかる課題を解決すべく、安定したシールドガス雰囲気をつくり、熱伝導のバランスが良いレーザ溶接継手および当該継手を用いた接合体を提供することを目的とする。   Accordingly, an object of the present invention is to provide a laser welded joint having a stable shielding gas atmosphere and a good balance of heat conduction, and a joined body using the joint, in order to solve such problems.

本発明に係るレーザ溶接継手は、上面板と下面板とが幅方向に配置された複数の傾斜したリブと、前記上面板および下面板に直交する幅方向端部の端部リブとによって接続された押出中空形材であり、その押出中空形材同士を幅方向に突き合わせ、その突き合わせた前記上面板同士および下面板同士の接合部に対してシールドガスを噴射しながら行われるレーザ溶接又はレーザ・アークハイブリッド溶接のためのものであって、前記一対の上面板には、両方の上面板の端部に突き出した一対の接合突起と、一方の上面板側に前記端部リブから突き出した副突起とが形成され、前記一対の下面板には、両方の下面板の端部に突き出した一対の接合突起と、一方の下面板側に前記端部リブから突き出した副突起とが形成され、前記一対の上面板同士および前記一対の下面板同士を突き合わせた場合に、前記副突起の曲面によって形成された先端部を他方の上面板または下面板の前記接合突起の裏側と前記端部リブとが連続するＲ面に突き当てることにより、前記一対の接合突起と副突起とによって囲んだ裏側空間を形成するものであることを特徴とする。 The laser welded joint according to the present invention is connected by a plurality of inclined ribs in which an upper surface plate and a lower surface plate are arranged in the width direction, and an end rib at a width direction end perpendicular to the upper surface plate and the lower surface plate. was an extruded hollow profile, butt the extruded hollow profile together in the width direction, laser welding or laser is performed while spraying a shielding gas to the joint portion of the upper plate and between the lower surface plates are abutted thereof For arc hybrid welding, the pair of upper surface plates includes a pair of joint protrusions protruding from the end portions of both upper surface plates , and a sub-projection protruding from the end rib on one upper surface plate side. The pair of lower surface plates are formed with a pair of joint protrusions protruding from the end portions of both lower surface plates, and a sub-projection protruding from the end rib on one lower surface plate side, a pair of the upper plate the And when the butt the pair of lower plate together, the R plane, wherein the back side of the joint projection of the sub-projection upper plate tip formed by a curved surface other or lower surface plate and said end rib is continuous By abutting, a back side space surrounded by the pair of joining projections and sub-projections is formed.

また、本発明に係るレーザ溶接継手は、前記一対の接合突起と副突起とが、レーザビームと同方向から噴射され前記裏側空間内に入ったシールドガスによる雰囲気になる所定断面積の裏側空間を形成するようにしたものであることが好ましい。 In the laser welded joint according to the present invention, the pair of joining projections and the sub-projections have a back side space having a predetermined cross-sectional area in which an atmosphere is formed by a shielding gas that is injected from the same direction as the laser beam and enters the back side space. It is preferable that they are formed .

本発明に係る接合体は、上面板と下面板とが幅方向に配置された複数の傾斜したリブと、前記上面板および下面板に直交する幅方向端部の端部リブとによって接続された押出中空形材であり、前記上面板および下面板の幅方向端部に形成されたレーザ溶接継手に対し、シールドガスを噴射しながら行われるレーザ溶接又はレーザ・アークハイブリッド溶接により、前記押出中空形材同士を接合して構成されたものであって、前記レーザ溶接継手は、前記一対の上面板には、両方の上面板の端部に突き出した一対の接合突起と、一方の上面板側に前記端部リブから突き出した副突起とが形成され、前記一対の下面板には、両方の下面板の端部に突き出した一対の接合突起と、一方の下面板側に前記端部リブから突き出した副突起とが形成され、前記一対の上面板同士および前記一対の下面板同士を突き合わせた場合に、前記副突起の曲面によって形成された先端部を他方の上面板または下面板の前記接合突起の裏側と前記端部リブとが連続するＲ面に突き当てることにより、前記一対の接合突起と副突起とによって囲んだ裏側空間を形成するものであることを特徴とする。 In the joined body according to the present invention, the upper surface plate and the lower surface plate are connected by a plurality of inclined ribs arranged in the width direction, and end ribs at the width direction end portions orthogonal to the upper surface plate and the lower surface plate. an extruded hollow shape member, with respect to the top plate and bottom plate laser-welded joint formed widthwise end portion of the, by laser welding or laser-arc hybrid welding is performed while spraying the shielding gas, the extrusion hollow shape The laser welded joint is formed by joining the pair of upper surface plates to the pair of upper surface plates, and a pair of joint protrusions protruding from the end portions of both upper surface plates. Sub-projections projecting from the end ribs are formed, and the pair of lower surface plates has a pair of joint projections projecting to the end portions of both lower surface plates, and projects from the end ribs to one of the lower surface plates. and the secondary projections are formed, If the serial abutted with each other pair of the upper plate and between the pair of lower face plate, the back-side of the junction protrusions sub projection upper plate or the lower plate of the tip formed by a curved surface other of said end ribs Is abutting against a continuous R surface to form a back side space surrounded by the pair of joint projections and sub projections.

よって、本発明によれば、一対の接合突起と副突起とによって囲んだ裏側空間を形成した接合部にレーザ溶接などを行うようにしたので、副突起の形状などによって裏側空間の容積を自由に設定することができ、安定したシールドガス雰囲気をつくってブローホールの発生を効果的に防止することが可能になるとともに、一対の接合突起の突き合わせ部分にレーザビームが照射されるため、両接合部材への熱伝導のバランスが良く、溶接品質を高いものにすることができる。   Therefore, according to the present invention, since the laser welding or the like is performed on the joint portion formed with the back side space surrounded by the pair of joint projections and the sub projections, the volume of the back side space can be freely set by the shape of the sub projections and the like. Both joint members can be set and a stable shield gas atmosphere can be created to effectively prevent the occurrence of blowholes and the laser beam is irradiated to the butted portion of the pair of joint protrusions. The balance of heat conduction is good and the welding quality can be made high.

次に、本発明に係るレーザ溶接継手および当該継手を用いた接合体について、その一実施形態を図面を参照しながら以下に説明する。
先ず図３は、本発明に係るレーザ溶接継手を用いた鉄道車両を示す斜視図である。この鉄道車両８０は、側面の側構体８１、屋根を形成する屋根構体８２、車体長手方向に対して両端を閉鎖する妻構体８３、そして床面を形成する台枠８４によって構成されている。特に、側構体８１と屋根構体８２は、車体一両分の長さ（２０ｍ程）の押出中空形材１０が幅方向に突き合わされ、レーザ溶接によって接合されている。 Next, an embodiment of a laser welded joint according to the present invention and a joined body using the joint will be described below with reference to the drawings.
First, FIG. 3 is a perspective view showing a railway vehicle using the laser welded joint according to the present invention. The railway vehicle 80 is composed of a side structure 81 on the side surface, a roof structure 82 that forms a roof, a wife structure 83 that closes both ends in the longitudinal direction of the vehicle body, and a frame 84 that forms a floor surface. In particular, the side structure 81 and the roof structure 82 are joined by laser welding with the extruded hollow shape member 10 having a length (about 20 m) corresponding to the length of one vehicle body butted in the width direction.

ここで、図１は、押出中空形材１０（１０Ａ，１０Ｂ）同士を接続するためのレーザ溶接継手を示した図である。この押出中空形材１０Ａ，１０Ｂは、車体軽量化に対応すべくアルミやアルミニウム合金を使用して押出し成形によってつくり出されたものである。具体的には、上面板１１と下面板１２とが幅方向に並べられた複数のリブ１３によって連結され、トラス構造をした断面形状を構成している。なお、図面を貫く方向が車体長手方向であり、図面の左右が幅方向である。そうした押出中空形材１０Ａ，１０Ｂ同士は、幅方向端部が図示するように嵌め合わされた接合部がレーザ溶接によって接合される。そのため、押出中空形材１０Ａ，１０Ｂには、幅方向端部に一組のレーザ溶接継手が形成されている。 Here, FIG. 1 is a view showing a laser welded joint for connecting the extruded hollow members 10 (10A, 10B) to each other. The extruded hollow members 10A and 10B are produced by extrusion molding using aluminum or an aluminum alloy in order to cope with the weight reduction of the vehicle body. Specifically, the upper surface plate 11 and the lower surface plate 12 are connected by a plurality of ribs 13 arranged in the width direction to form a cross-sectional shape having a truss structure. In addition, the direction which penetrates drawing is a vehicle body longitudinal direction, and the right and left of drawing are width directions. Such extruded hollow shape members 10A, 10B each other, joint widthwise end portion is fitted as shown, is joined by laser welding. Therefore, a set of laser welded joints is formed at the ends in the width direction of the extruded hollow shapes 10A and 10B.

一対の組合せからなるそのレーザ溶接継手は、一方が押出中空形材１０Ａの右端部に表されているように、上面板１１および下面板１２に直交する右端の端部リブ１５を備え、その端部リブ１５から幅方向に突き出るように接合突起１７が形成されている。また、他方は、押出中空形材１０Ｂの左端部に表されているように、上面板１１および下面板１２に直交する左端の端部リブ１６が形成され、その端部リブ１６から幅方向に突き出るように接合突起１８と副突起１９が形成されている。この副突起１９は、接合突起１７，１８を突き合わせた接合部の裏側にシールドガス雰囲気をつくる裏側空間２０を形成するためのものである。 The laser-welded joint made of a pair includes a right-end end rib 15 orthogonal to the upper surface plate 11 and the lower surface plate 12 so that one end is represented at the right end portion of the extruded hollow member 10A. A joining protrusion 17 is formed so as to protrude from the part rib 15 in the width direction. On the other hand, as shown in the left end portion of the extruded hollow member 10B, a left end end rib 16 orthogonal to the upper surface plate 11 and the lower surface plate 12 is formed, and the end rib 16 extends in the width direction. A joint projection 18 and a sub-projection 19 are formed so as to protrude. The sub-projections 19 are for forming a back space 20 that creates a shielding gas atmosphere on the back side of the joint where the joint projections 17 and 18 are abutted.

ここで図２は、上面板１１側のレーザ溶接継手の接合部を拡大して示した図である。なお、レーザ溶接継手は、図１に示すように上面板１１側と下面板１２側とで対称的な形状で形成されている。
接合突起１７，１８は、上面板１１や下面板１２の延長上に形成され、接合強度を確保するため肉厚に形成されている。そして、本実施形態では、レーザ溶接が行われる接合突起１７，１８が端部リブ１５，１６から共に突設されている。すなわち、押出中空形材１０Ａ，１０Ｂを構成するアルミは熱伝導率が高いため、特に接合突起１８側において接合部の偏った熱分散を抑えるため、左右両方の熱容量が同じになるように構成されている。 Here, FIG. 2 is an enlarged view of the joint portion of the laser weld joint on the top plate 11 side. The laser weld joint is formed in a symmetrical shape on the upper surface plate 11 side and the lower surface plate 12 side as shown in FIG.
The joining protrusions 17 and 18 are formed on the extension of the upper surface plate 11 and the lower surface plate 12, and are formed thick to ensure the joining strength. And in this embodiment, the joint protrusions 17 and 18 in which laser welding is performed are projected from the end ribs 15 and 16 together. That, extruded hollow shape members 10A, due to the high aluminum thermal conductivity constituting the 10B, in order to suppress the uneven heat dispersion of a joint, particularly in joining protrusion 18 side, the heat capacity of both left and right are configured to be the same ing.

副突起１９は、端部リブ１６の付け根部分から上面板１１側（或いは下面板１２側）に傾斜或いは湾曲し、その曲面の先端が接合突起１７と端部リブ１５とが連続するＲ面２１付近に当たるように形成されている。これは、押出中空形材１０Ａ，１０Ｂの嵌め合わせが容易になるように構成したものである。つまり、上面板１１と下面板１２の両側で接合突起１７，１８を突き当てた際、上下の副突起１９がそれぞれのＲ面２１付近に位置決めされ、図１に示すように、押出中空形材１０Ａ，１０Ｂを正しい状態で容易に嵌め合わせるようになっている。 The sub-projection 19 is inclined or curved from the base portion of the end rib 16 to the upper surface plate 11 side (or the lower surface plate 12 side), and the curved surface has an R surface 21 where the joint protrusion 17 and the end rib 15 are continuous. It is formed to hit the vicinity. This is constructed as extruded hollow shape member 10A, the mating of 10B is facilitated. That is, when the butted joining projections 17, 18 on both sides of the upper plate 11 and lower plate 12, the upper and lower sub-projection 19 is positioned in the vicinity of each of the R-plane 21, as shown in FIG. 1, extruded hollow profile 10A and 10B are easily fitted in the correct state.

ところで、接合部の裏側にできた裏側空間２０に対し、直接レーザ溶接時にシールドガスを供給すると、シールドガスの圧力が高い場合、溶融した接合部にガスが入り込んでしまいブローホールが生じやすくなる。そこで、本実施形態のレーザ溶接継手を使用した溶接では、シールドガスを副突起１９によってできた裏側空間２０へ直接供給することはせず、レーザビームＬと同方向から噴射するものだけとする。 By the way, if a shielding gas is directly supplied to the back side space 20 formed on the back side of the joint portion at the time of laser welding, when the pressure of the shield gas is high, the gas enters the melted joint portion and blowholes are easily generated. Therefore, in welding using the laser welded joint of the present embodiment, the shield gas is not directly supplied to the back space 20 formed by the sub-projections 19, but is only injected from the same direction as the laser beam L.

その際、接合部裏側でのシールド環境が安定したものとなるようにするためは、裏側空間２０が所定の容積で形成されていることが必要である。容積の大小によって裏側空間２０内のシールドガス圧力が高すぎたり低すぎたりすることによってブローホールが発生してしまうからである。そこで本実施形態では、裏側空間２０の容積が適切な値になるように、検討結果に基づいて、図２に示す当該断面積が６〜１５ｍｍ2 となるように形成されている。 In that case, in order to make the shielding environment on the back side of the joint portion stable, it is necessary that the back side space 20 is formed with a predetermined volume. Because blowholes occur by too low Ri shielding gas pressure in the back space 20 is too high by the size of the volume. Therefore, in this embodiment, the cross-sectional area shown in FIG. 2 is formed to be 6 to 15 mm <2> based on the examination results so that the volume of the back space 20 becomes an appropriate value.

具体的には、接合突起１７，１８の端部リブ１５，１６の外面からの突出量が０．５〜３ｍｍの間で形成され、副突起１９の端部リブ１６の外面からの突出量が１０ｍｍ以下で形成される。更に、その副突起１９と接合突起１８の向かい合う面同士であって、最も離れた位置での距離が３ｍｍ以下になるようにして形成されている。また、裏側空間２０のシールド環境が安定するように、副突起１９の先端が端部リブ１５側から離間してしまう場合であっても、その隙間が２ｍｍ以下になるように形成されている。   Specifically, the protruding amount from the outer surface of the end ribs 15, 16 of the joining protrusions 17, 18 is formed between 0.5 and 3 mm, and the protruding amount from the outer surface of the end rib 16 of the sub-projection 19 is It is formed with 10 mm or less. Furthermore, the sub-projections 19 and the joint projections 18 are formed so that the distances between the opposing surfaces and the farthest position are 3 mm or less. Further, in order to stabilize the shielding environment of the back side space 20, even when the tip of the sub-projection 19 is separated from the end rib 15 side, the gap is formed to be 2 mm or less.

次に、鉄道車両８０では、こうしたレーザ溶接継手を有する押出中空形材１０（１０Ａ，１０Ｂ）が幅方向に突き合わされ、その接合部分がレーザ溶接によって接合され側構体８１や屋根構体８２が構成される。押出中空形材１０Ａ，１０Ｂを接合する場合、接合突起１７，１８の突き合わせ面が接合部２２となる。従って、そのレーザ溶接継手には、図１に示すように上面板１１及び下面板１２の外側からそれぞれ接合部２２にレーザビームＬが照射される。 Next, in the railway vehicle 80, the extruded hollow shape member 10 (10A, 10B) having such a laser welded joint is abutted in the width direction, and the joint portion is joined by laser welding to form the side structure 81 and the roof structure 82. The When joining extruded hollow shape members 10A, the 10B, abutting surfaces of the joint projections 17, 18 is the junction 22. Therefore, as shown in FIG. 1, the laser beam L is irradiated to the joint portion 22 from the outside of the upper surface plate 11 and the lower surface plate 12 to the laser weld joint.

そして、接合部２２には、レーザビームＬと同方向から同時にシールドガスが吹き付けられる。接合部２２は、押出中空形材１０Ａ，１０Ｂの長手方向に連続する接合線となるため、レーザ溶接では、レーザビームＬがその接合線に沿って連続照射され、シールドガスがその進行方向前方から吹き付けられる。レーザビームが照射された接合部２２では、集中的な加熱によって接合突起１７，１８が溶融して溶接が行われる。その際、レーザビームＬの照射部分には隙間ができるため、そこからシールドガスが反対側に流れ込んで裏側空間２０内にシールドガス雰囲気がつくられる。   Then, a shield gas is simultaneously blown onto the bonding portion 22 from the same direction as the laser beam L. Since the joining portion 22 becomes a joining line continuous in the longitudinal direction of the extruded hollow members 10A and 10B, in laser welding, the laser beam L is continuously irradiated along the joining line, and the shield gas is forward from the traveling direction. Be sprayed. In the joint portion 22 irradiated with the laser beam, the joint protrusions 17 and 18 are melted and welded by intensive heating. At that time, since a gap is formed in the irradiated portion of the laser beam L, the shield gas flows into the opposite side from there and a shield gas atmosphere is created in the back space 20.

本実施形態のレーザ溶接継手によれば、所定容積の裏側空間２０が形成され、安定したシールドガス雰囲気がつくられるので、レーザ溶接によって発生し得るブローホールなどの欠陥を効果的に防止することができる。そのため、品質の良いレーザ溶接によってできた鉄道車両を提供することが可能になる。また、本実施形態では、副突起１９を設けて裏側空間２０を形成する簡単な構成によって、シールドガス雰囲気をつくり、それによって接合部の品質を高めることができた。更に、接合部２２の左右両側が同じ断面の接合突起１７，１８であるため、偏った熱分散を抑えることができ、熱伝導率が高いアルミであっても、左右両方の熱容量を同じにして溶接品質を高めることが可能になった。   According to the laser welded joint of this embodiment, the back space 20 having a predetermined volume is formed, and a stable shielding gas atmosphere is created. Therefore, defects such as blow holes that can be generated by laser welding can be effectively prevented. it can. Therefore, it becomes possible to provide a railway vehicle made by high-quality laser welding. In the present embodiment, a shield gas atmosphere can be created by a simple configuration in which the sub-projections 19 are provided to form the back space 20, thereby improving the quality of the joint. Further, since the left and right sides of the joint portion 22 are the joint protrusions 17 and 18 having the same cross section, it is possible to suppress uneven heat dispersion, and even in the case of aluminum having high thermal conductivity, both the left and right heat capacities are made the same. It became possible to improve the welding quality.

また、本実施形態のレーザ溶接継手では、上面板１１及び下面板１２の両側に副突起１９を形成し、それをＲ面２１付近に当てるようにして押出中空形材１０Ａ，１０Ｂの端部同士を嵌め合わすため、極めて容易に厚さ方向（図面上下方向）の位置合わせを行うことができるようになった。更に、副突起１９があることにより、例えば上面板１１側の接合時に、接合部２２が溶融して生じた溶滴を受けることによって、反対の下面板１２側への溶滴による影響を防止することができるようになった。また、仮に接合部２２をレーザビームＬが貫通してしまった場合があっても、副突起１９に当たることで反対の溶接部への影響を防止することができる。 Further, in the laser welded joint according to the present embodiment, the auxiliary projections 19 are formed on both sides of the upper surface plate 11 and the lower surface plate 12, and the ends of the extruded hollow members 10A and 10B are made to contact each other in the vicinity of the R surface 21. Therefore, the positioning in the thickness direction (vertical direction in the drawing) can be performed very easily. Furthermore, the presence of the sub-projections 19 prevents, for example, the influence of the droplets on the opposite lower surface plate 12 side by receiving the droplets generated by melting the bonding portion 22 during the bonding on the upper surface plate 11 side. I was able to do it. Even if the laser beam L may penetrate through the joint portion 22, it can be prevented from affecting the opposite welded portion by hitting the sub-projection 19.

本実施形態のレーザ溶接継手を備えた押出中空形材１０（１０Ａ，１０Ｂ）は、端部リブ１５，１６が形成されているので、上面板１１や下面板１２が薄肉（２〜３ｍｍ）であっても幅方向端部の剛性を高めることができた。従って、鉄道車両を構成する押出中空形材１０は、２０ｍ程の長尺な部材であるため、端部リブ１５，１６がないもののように、車体組み立て時に上面板１１や下面板１２を変形させてしまうおそれがなくなった。すなわち、押出中空形材１０の取り扱いが容易になった。   Since the end ribs 15 and 16 are formed in the extruded hollow member 10 (10A, 10B) provided with the laser welded joint according to the present embodiment, the upper surface plate 11 and the lower surface plate 12 are thin (2 to 3 mm). Even if it existed, the rigidity of the edge part of the width direction was able to be improved. Therefore, since the extruded hollow member 10 constituting the railway vehicle is a long member of about 20 m, the upper surface plate 11 and the lower surface plate 12 are deformed at the time of assembling the vehicle body, like those without the end ribs 15 and 16. There is no longer a risk of being lost. That is, handling of the extruded hollow shape member 10 became easy.

ところで、本実施形態のレーザ溶接継手は、レーザ・アークハイブリッド溶接による接合方法の場合にも有効である。レーザ・アークハイブリッド溶接では、嵌め合わせた押出中空形材１０Ａ，１０Ｂの接合部２２に対し、レーザビームＬの照射とともに、進行方向の前方からはシールドガスが吹き付けられる。更に、進行方向後方には、例えばＭＩＧトーチによりＭＩＧアークが供給されることで溶接が行われる。その際、前述したレーザ溶接の場合と同様に、接合部２２に吹き付けられたシールドガスが裏側空間２０内に入り込んでシールドガス雰囲気がつくられる。そして、レーザ溶接と同様の効果を奏する。 By the way, the laser weld joint of this embodiment is also effective in the case of a joining method by laser-arc hybrid welding. The laser-arc hybrid welding, mating extruded hollow shape member 10A, with respect to the junction 22 of 10B, with the irradiation of the laser beam L, the shielding gas is blown from the front of the traveling direction. Further, welding is performed by supplying a MIG arc, for example, by a MIG torch at the rear of the traveling direction. At this time, as in the case of the laser welding described above, the shield gas blown to the joint portion 22 enters the back space 20 to create a shield gas atmosphere. And there exists an effect similar to laser welding.

以上、本発明に係るレーザ溶接継手および当該継手を用いた接合体の一実施形態について説明したが、本発明はこれに限定されることなく、その趣旨を逸脱しない範囲で様々な変更が可能である。   As described above, the laser welded joint according to the present invention and the embodiment of the joined body using the joint have been described. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention. is there.

レーザ溶接継手の一実施形態を示した図である。It is the figure which showed one Embodiment of the laser welding joint. 図１に示すレーザ溶接継手を拡大して示した図である。It is the figure which expanded and showed the laser welding joint shown in FIG. レーザ溶接継手を用いた鉄道車両を示す斜視図である。It is a perspective view which shows the rail vehicle using a laser welding joint. 特許文献１に開示された鉄道車両におけるパネル溶接構造の要部縦断面図である。It is a principal part longitudinal cross-sectional view of the panel welding structure in the rail vehicle disclosed by patent document 1. FIG. 従来のレーザ溶接継手を示した図である。It is the figure which showed the conventional laser welding joint. 従来のレーザ溶接継手を示した図である。It is the figure which showed the conventional laser welding joint.

符号の説明Explanation of symbols

１０（１０Ａ，１０Ｂ） 押出中空形材
１１ 上面板
１２ 下面板
１３ リブ
１５，１６ 端部リブ
１７，１８ 接合突起
１９ 副突起
２０ 裏側空間 10 (10A, 10B) Extruded hollow profile 11 Upper surface plate 12 Lower surface plate 13 Ribs 15 and 16 End ribs 17 and 18 Joint projection 19 Sub projection 20 Back space

Claims (3)

上面板と下面板とが幅方向に配置された複数の傾斜したリブと、前記上面板および下面板に直交する幅方向端部の端部リブとによって接続された押出中空形材であり、その押出中空形材同士を幅方向に突き合わせ、その突き合わせた前記上面板同士および下面板同士の接合部に対してシールドガスを噴射しながら行われるレーザ溶接又はレーザ・アークハイブリッド溶接のためのレーザ溶接継手において、
前記一対の上面板には、両方の上面板の端部に突き出した一対の接合突起と、一方の上面板側に前記端部リブから突き出した副突起とが形成され、
前記一対の下面板には、両方の下面板の端部に突き出した一対の接合突起と、一方の下面板側に前記端部リブから突き出した副突起とが形成され、
前記一対の上面板同士および前記一対の下面板同士を突き合わせた場合に、前記副突起の曲面によって形成された先端部を他方の上面板または下面板の前記接合突起の裏側と前記端部リブとが連続するＲ面に突き当てることにより、前記一対の接合突起と副突起とによって囲んだ裏側空間を形成するものであることを特徴とするレーザ溶接継手。 An extruded hollow profile connected by a plurality of inclined ribs in which an upper surface plate and a lower surface plate are arranged in the width direction, and end ribs in a width direction end perpendicular to the upper surface plate and the lower surface plate, Laser welded joints for laser welding or laser-arc hybrid welding performed by abutting extruded hollow shapes in the width direction and injecting shield gas to the joined portions of the abutted upper and lower plates In
The pair of upper surface plates are formed with a pair of joint protrusions protruding from the end portions of both upper surface plates , and a sub-projection protruding from the end rib on one upper surface plate side ,
The pair of lower surface plates are formed with a pair of joint protrusions protruding from the end portions of both lower surface plates, and a sub-projection protruding from the end rib on one lower surface plate side,
When the pair of upper surface plates and the pair of lower surface plates are brought into contact with each other , the tip formed by the curved surface of the sub-projection is the other upper surface plate or the back surface of the joint protrusion of the lower surface plate and the end rib. A laser welded joint characterized by forming a back side space surrounded by the pair of joining projections and sub-projections by abutting against a continuous R surface . 請求項１に記載のレーザ溶接継手において、
前記一対の接合突起と副突起とは、レーザビームと同方向から噴射され前記裏側空間内に入ったシールドガスによる雰囲気になる所定断面積の裏側空間を形成するようにしたものであることを特徴とするレーザ溶接継手。 The laser weld joint according to claim 1,
The pair of joining projections and sub-projections are formed so as to form a back side space having a predetermined cross-sectional area that is jetted from the same direction as the laser beam and becomes an atmosphere by a shield gas that enters the back side space. Laser welded joint. 上面板と下面板とが幅方向に配置された複数の傾斜したリブと、前記上面板および下面板に直交する幅方向端部の端部リブとによって接続された押出中空形材であり、前記上面板および下面板の幅方向端部に形成されたレーザ溶接継手に対し、シールドガスを噴射しながら行われるレーザ溶接又はレーザ・アークハイブリッド溶接により、前記押出中空形材同士を接合して構成された接合体において、
前記レーザ溶接継手は、前記一対の上面板には、両方の上面板の端部に突き出した一対の接合突起と、一方の上面板側に前記端部リブから突き出した副突起とが形成され、
前記一対の下面板には、両方の下面板の端部に突き出した一対の接合突起と、一方の下面板側に前記端部リブから突き出した副突起とが形成され、
前記一対の上面板同士および前記一対の下面板同士を突き合わせた場合に、前記副突起の曲面によって形成された先端部を他方の上面板または下面板の前記接合突起の裏側と前記端部リブとが連続するＲ面に突き当てることにより、前記一対の接合突起と副突起とによって囲んだ裏側空間を形成するものであることを特徴とする接合体。 An extruded hollow profile connected by a plurality of inclined ribs in which an upper surface plate and a lower surface plate are arranged in the width direction, and end ribs in the width direction end perpendicular to the upper surface plate and the lower surface plate, The extruded hollow shapes are joined to each other by laser welding or laser-arc hybrid welding performed while spraying a shielding gas to the laser welded joint formed at the width direction end of the top plate and bottom plate. In the joined body,
In the laser welded joint , the pair of upper surface plates are formed with a pair of joint protrusions protruding from the end portions of both upper surface plates , and a sub-projection protruding from the end rib on one upper surface plate side ,
The pair of lower surface plates are formed with a pair of joint protrusions protruding from the end portions of both lower surface plates, and a sub-projection protruding from the end rib on one lower surface plate side,
When the pair of upper surface plates and the pair of lower surface plates are brought into contact with each other , the tip formed by the curved surface of the sub-projection is the other upper surface plate or the back surface of the joint protrusion of the lower surface plate and the end rib. A bonded body characterized by forming a back side space surrounded by the pair of bonding projections and sub-projections by abutting against a continuous R surface .
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