JP2012066276A - Weld end structure of friction stir welding - Google Patents

Weld end structure of friction stir welding Download PDF

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JP2012066276A
JP2012066276A JP2010212927A JP2010212927A JP2012066276A JP 2012066276 A JP2012066276 A JP 2012066276A JP 2010212927 A JP2010212927 A JP 2010212927A JP 2010212927 A JP2010212927 A JP 2010212927A JP 2012066276 A JP2012066276 A JP 2012066276A
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friction stir
stir welding
flange
joint
joined
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JP5647474B2 (en
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Tetsuo Sato
哲郎 佐藤
Toshiyuki Suda
俊之 須田
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Nippon Sharyo Ltd
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Nippon Sharyo Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a weld end structure of friction stir welding capable of working a welding end before the friction stir welding to prevent any fatigue fracture.SOLUTION: When a first member 10 to be welded and a second member 12 to be welded having a flange 12a to be overlapped on a welding face of the first member 10 and a web 12b erected from the flange 12a are welded to each other by the friction stir welding, the friction stir welding end structure is formed corresponding to a longitudinal end 231 of a weld part 23. The second member 12 has a slit 25 for dividing the flange 12a and the web 12b in a predetermined range corresponding to the longitudinal end 231 of the weld part 23.

Description

本発明は、重ね合わせた被接合部材を摩擦撹拌接合によって接合するものであって、線状に接合した接合部の接合端部における疲労破壊の防止を図った摩擦撹拌接合の接合端部構造に関する。   The present invention relates to a joint end structure of friction stir welding that joins overlapped members to be joined by friction stir welding, and prevents fatigue fracture at the joint end of the joint joined linearly. .

重ね合わせた被接合板同士の摩擦撹拌接合では、回転させた回転接合工具のプローブが上側の被接合板側から重ね合わせ方向に押し込まれ、被接合板の平面方向に移動する。摩擦によって軟化した被接合部材の材料は塑性流動し、回転接合工具の通過後、重なり合う被接合板同士で混ざり合った材料が冷却固化して接合部が形成される。ところが、こうした線状に形成される接合部は、その接合端部に応力が集中し、疲労破壊を引き起こしてしまうことが問題であった。   In the friction stir welding between the stacked plates to be bonded, the probe of the rotated rotary bonding tool is pushed in the overlapping direction from the upper bonded plate side and moves in the plane direction of the bonded plates. The material of the member to be joined that has been softened by friction plastically flows, and after passing through the rotary joining tool, the material mixed between the overlapping plates to be joined is cooled and solidified to form a joint. However, such a joint formed in a linear shape has a problem that stress concentrates on the joint end portion and causes fatigue failure.

下記特許文献１には、そうした疲労破壊に対する強度向上を図った構造が提案されている。図７及び図８は、同文献に開示された摩擦撹拌接合の接合端部構造を示す図であり、図７は、加工前の断面（ａ）と平面（ｂ）を示し、図８は加工後の断面（ａ）と平面（ｂ）を示している。摩擦撹拌接合では、図７（ａ）に示すように、上部材１０１を貫通して下部材１０２の途中までの材料が撹拌された接合部１０５が形成されている。そして、この接合部１０５の先端１１５に応力が集中する。   Patent Document 1 below proposes a structure that improves the strength against fatigue fracture. 7 and 8 are views showing the joint end structure of the friction stir welding disclosed in the same document. FIG. 7 shows a cross section (a) and a plane (b) before processing, and FIG. A rear section (a) and a plane (b) are shown. In the friction stir welding, as shown in FIG. 7A, a joint portion 105 is formed in which the material is stirred up to the middle of the lower member 102 through the upper member 101. And stress concentrates on the front-end | tip 115 of this junction part 105. FIG.

そこで、図８に示すように、先端１１５からある程度の長さの範囲を先端部分１２５とし、上部材１０１の表面を削り薄肉になるようにした加工が行われる。上部材１０１を徐々に下部材１０２側に薄くなるように加工し、上部材１０１の薄肉部１１１が設けられている。このような文献記載の従来構造は、先端部分１２５での剛性変化が滑らかになり、応力集中の緩和によって疲労破壊が防止されるというものである。   Therefore, as shown in FIG. 8, processing is performed in which a certain length range from the tip 115 is used as the tip portion 125, and the surface of the upper member 101 is cut and thinned. The upper member 101 is processed so as to gradually become thinner toward the lower member 102, and a thin portion 111 of the upper member 101 is provided. Such a conventional structure described in the literature is such that the rigidity change at the tip portion 125 becomes smooth, and fatigue failure is prevented by relaxation of stress concentration.

特開２００５−１６９４１３号公報JP 2005-169413 A

図８に示す摩擦撹拌接合の接合端部構造では、摩擦撹拌接合による接合工程の後に薄肉部１１１を形成する切削加工が行われる。従って、上部材１０１及び下部材１０２のように平板同士の接合であればともかく、立体的な被接合部材の接合の場合には、接合後の狭い空間で切削加工を行わなければならず、薄肉部１１１の加工作業が困難であった。一方で、予め薄肉部１１１を加工した後に摩擦撹拌接合はできないため、どうしても切削加工は摩擦撹拌接合の後工程になってしまう。摩擦撹拌接合が使用される構造体には、こうした接合端部が複数存在するため、非常に手間のかかる作業になり、その分コストを上げる原因にもなってしまう。   In the joint end portion structure of the friction stir welding shown in FIG. 8, the cutting process for forming the thin portion 111 is performed after the joining step by the friction stir welding. Therefore, in the case of joining three-dimensional members to be joined, such as the upper member 101 and the lower member 102, in the case of joining three-dimensional members to be joined, cutting must be performed in a narrow space after joining. Processing of the part 111 was difficult. On the other hand, since the friction stir welding cannot be performed after the thin-walled portion 111 has been processed in advance, the cutting process is inevitably a subsequent process of the friction stir welding. A structure using friction stir welding has a plurality of such joining end portions, which is a very laborious work, and increases the cost accordingly.

本発明は、かかる課題を解決すべく、疲労破壊の防止に対する接合端部の加工が摩擦撹拌接合前に可能な摩擦撹拌接合の接合端部構造を提供することを目的とする。   In order to solve such a problem, an object of the present invention is to provide a joint end structure of friction stir welding capable of processing a joint end portion for preventing fatigue fracture before friction stir welding.

本発明に係る摩擦撹拌接合の接合端部構造は、一方の第１被接合部材と、その第１被接合部材の接合面に重ねて接合されるフランジ及び当該フランジから起立した状態となるウェブを備えた第２被接合部材とが、摩擦撹拌接合によって接合された場合の、当該接合部の長手方向端部に対応して形成されたものであって、前記第２被接合部材は、前記接合部の長手方向端部に対応する所定の範囲に、前記フランジとウェブとを分割するスリットが形成されたものであることを特徴とする。
また、本発明に係る摩擦撹拌接合の接合端部構造は、前記スリットが、前記フランジ側又は前記ウェブ側に形成されたものであることが好ましい。
また、本発明に係る摩擦撹拌接合の接合端部構造は、前記フランジに、前記接合部の長手方向端部を挟んで前記スリットの反対側に切欠部が形成されたものであることが好ましい。
また、本発明に係る摩擦撹拌接合の接合端部構造は、前記切欠部が、前記接合部の長手方向に沿って直線状に形成され、又は前記接合部の長手方向端部に向けて前記フランジの幅を狭くするようにテーパ状に形成されたものであることが好ましい。 The joint end structure of friction stir welding according to the present invention includes a first joined member, a flange that is joined to the joining surface of the first joined member, and a web that stands up from the flange. When the provided second member to be joined is joined by friction stir welding, the second member to be joined is formed corresponding to the longitudinal end portion of the joint, and the second member to be joined is the joint The slit which divides | segments the said flange and a web is formed in the predetermined range corresponding to the longitudinal direction edge part of a part, It is characterized by the above-mentioned.
In the joint end structure for friction stir welding according to the present invention, the slit is preferably formed on the flange side or the web side.
Moreover, it is preferable that the joining edge part structure of the friction stir welding which concerns on this invention is a thing by which the notch part was formed in the said flange on the opposite side of the said slit on both sides of the longitudinal direction edge part.
Further, in the joint end structure of the friction stir welding according to the present invention, the notch is formed linearly along the longitudinal direction of the joint, or the flange toward the longitudinal end of the joint. It is preferably formed in a tapered shape so as to narrow the width.

本発明によれば、第２被接合部材に対し第１接合部材へ摩擦撹拌接合による接合を行う前にスリットを加工しておくことができる。従って、第１被接合部材へ摩擦撹拌接合によって接合された第２被接合部材には、接合後に疲労強度を向上させるための加工が不要になり、接合作業が簡素化できる。そして、スリットによってフランジがウェブから分離したことで、第１被接合部材の変形に伴う応力集中が緩和し、疲労破壊を防止することができる。   According to the present invention, the slit can be processed before the second bonded member is bonded to the first bonded member by friction stir welding. Therefore, the second joined member joined to the first joined member by friction stir welding does not require processing for improving fatigue strength after joining, and the joining work can be simplified. And since the flange has been separated from the web by the slit, the stress concentration accompanying the deformation of the first member to be joined is relaxed, and fatigue failure can be prevented.

実施形態に係る摩擦撹拌接合の接合端部構造を示した平面図である。It is the top view which showed the joining end part structure of the friction stir welding which concerns on embodiment. 実施形態に係る摩擦撹拌接合の接合端部構造を示した図１のＡ方向から見た側面図である。It is the side view seen from the A direction of Drawing 1 showing the joint end part structure of friction stir welding concerning an embodiment. 実施形態に係る摩擦撹拌接合の接合端部構造を示した図１のＢ−Ｂ断面図である。It is BB sectional drawing of Drawing 1 showing the joint end part structure of friction stir welding concerning an embodiment. 他の実施形態に係る摩擦撹拌接合の接合端部構造を示した側面図である。It is the side view which showed the joining edge part structure of the friction stir welding which concerns on other embodiment. 他の実施形態に係る摩擦撹拌接合の接合端部構造を示した平面図である。It is the top view which showed the joining end part structure of the friction stir welding which concerns on other embodiment. 他の実施形態に係る摩擦撹拌接合の接合端部構造を示した平面図である。It is the top view which showed the joining end part structure of the friction stir welding which concerns on other embodiment. 摩擦撹拌接合の接合端部を示す図である。It is a figure which shows the joining end part of friction stir welding. 従来の摩擦撹拌接合の接合端部構造を示した図である。It is the figure which showed the joining end part structure of the conventional friction stir welding.

次に、本発明に係る摩擦撹拌接合の接合端部構造について、その一実施形態を図面を参照しながら以下に説明する。図１乃至図３は、摩擦撹拌接合の接合端部構造を示した図であり、図１は平面図、図２は図１のＡ方向から見た側面図、そして図３は図１のＢ−Ｂ断面図である。本実施形態は、航空機の胴体や鉄道車両の構体などに採用される接合構造であって、外板１０に対して縦横に縦通材１１とフレーム１２が骨部材として接合されている。縦通材１１は構体などの長手方向に延びた部材であり、フレーム１２は、その縦通材１１に直交する方向に沿って接合されている。   Next, an embodiment of the joint end structure of friction stir welding according to the present invention will be described below with reference to the drawings. FIG. 1 to FIG. 3 are views showing a joining end structure of friction stir welding, FIG. 1 is a plan view, FIG. 2 is a side view seen from the direction A in FIG. 1, and FIG. It is -B sectional drawing. The present embodiment is a joint structure that is employed in an aircraft fuselage, a railway vehicle structure, and the like, in which a longitudinal member 11 and a frame 12 are joined as a bone member vertically and horizontally to an outer plate 10. The longitudinal member 11 is a member extending in the longitudinal direction, such as a structure, and the frame 12 is joined along a direction orthogonal to the longitudinal member 11.

交差する縦通材１１とフレーム１２は、フレーム１２側に切欠部２１が形成され、縦通材１１がその切欠部２１を通って構体などの長手方向に連続している。縦通材１１及びフレーム１２は、共に外板１０に重ねられるフランジ１１ａ，１２ａと、それに直交するウェブ１１ｂ，１２ｂを備える断面Ｌ字形の骨部材である。図２に示すように、縦通材１１の方がフレーム１２よりウェブ１１ｂの背が低く、フレーム１２に形成された切欠部２１内を通過するようにして配置されている。   The crossing longitudinal member 11 and the frame 12 have a notch 21 formed on the frame 12 side, and the longitudinal member 11 continues through the notch 21 in the longitudinal direction of the structure. The longitudinal member 11 and the frame 12 are bone members having an L-shaped cross section including flanges 11 a and 12 a that are stacked on the outer plate 10 and webs 11 b and 12 b that are orthogonal to the flanges 11 a and 12 a. As shown in FIG. 2, the longitudinal member 11 is shorter in the web 11 b than the frame 12 and is disposed so as to pass through the notch 21 formed in the frame 12.

縦通材１１及びフレーム１２は、共にフランジ１１ａ，１２ａ側から回転する不図示の回転接合工具のプローブが重ね合わせ方向に押し込まれ、各部材の長手方向に沿って移動する。摩擦によって軟化した被接合材の材料は塑性流動し、回転接合工具の通過後、重なり合う外板１０とフランジ１１ａ，１２ａとの材料が混ざり合い、冷却固化して接合部２２，２３が形成される。   Both the longitudinal member 11 and the frame 12 are moved along the longitudinal direction of each member when a probe of a rotary joining tool (not shown) rotating from the flanges 11a and 12a side is pushed in the overlapping direction. The material of the material to be joined softened by friction plastically flows, and after passing through the rotary joining tool, the materials of the overlapping outer plate 10 and the flanges 11a and 12a are mixed and cooled and solidified to form the joints 22 and 23. .

この場合、縦通材１１は、構体などの全長に渡って途切れることなく接合部２２が連続しているため、接合端部は接合部２２の始点と終点の２箇所となる。一方で、フレーム１２は、縦通材１１が交差する位置に形成された切欠部２１によってフランジ１２ａが切断されている。そのため、一つのフレーム１２には、複数本の接合部２３が断続的に形成され、始点及び終点の接合端部２３１が複数存在する。   In this case, the stringer 11 has the joint portion 22 continuous without being interrupted over the entire length of the structure or the like, and therefore, the joint end portion is two places, the start point and the end point of the joint portion 22. On the other hand, the flange 12a of the frame 12 is cut by a notch 21 formed at a position where the longitudinal members 11 intersect. Therefore, a plurality of joint portions 23 are intermittently formed in one frame 12, and a plurality of joint end portions 231 at the start point and the end point exist.

図示するように、切欠部２１を挟んで接合部２３の接合端部２３１が位置する。外板１０にかかる外力により、接合端部２３１に応力が集中し、剥離など疲労破壊が生じ得る。そこで、本実施形態では、その接合端部２３１が存在する範囲に、フランジ１２ａをウェブ１２ａから切り離すスリット２５が形成されている。このようにスリット２５を形成することにより、当該範囲におけるフレーム１２の剛性を低下させている。断面Ｌ字形の縦通材１１やフレーム１２は、骨部材として機能し、胴体や構体の剛性を高める機能を果たしているため、前記従来例のように薄肉部を形成するだけでは、接合端部２３１に加わる応力を十分には抑えられないからである。   As shown in the drawing, the joining end portion 231 of the joining portion 23 is located across the notch portion 21. Due to the external force applied to the outer plate 10, stress concentrates on the joint end 231, and fatigue failure such as peeling may occur. Therefore, in the present embodiment, a slit 25 for separating the flange 12a from the web 12a is formed in a range where the joining end portion 231 exists. By forming the slit 25 in this way, the rigidity of the frame 12 in the range is reduced. The longitudinal member 11 and the frame 12 having an L-shaped cross section function as a bone member and have a function of increasing the rigidity of the trunk and the structure. Therefore, the joint end 231 is formed only by forming a thin portion as in the conventional example. This is because the stress applied to the film cannot be sufficiently suppressed.

航空機の胴体や鉄道車両の構体に外力が作用した場合、外板１０が変形しようとするのを抑えるようにフランジ１２ａに曲げ応力が作用する。しかし、フランジ１２ａ自体はウェブ１２ｂによって曲げが抑えられるため、フランジ１２ａが薄肉になっても依然として外板１０の曲げに対する剛性は高い。従って、疲労破壊を十分に抑えることはできない。そこで、本実施形態では、フランジ１２ａとウェブ１２ｂを分離し、フランジ１２ａが接合端部２３１が存在する所定の範囲で外板１０の曲げ変形に倣うようにし、応力集中を緩和させるようにした。   When an external force is applied to an aircraft fuselage or a railway vehicle structure, a bending stress is applied to the flange 12a so as to prevent the outer plate 10 from being deformed. However, since the bending of the flange 12a itself is suppressed by the web 12b, the rigidity with respect to the bending of the outer plate 10 is still high even if the flange 12a becomes thin. Therefore, fatigue failure cannot be sufficiently suppressed. Therefore, in the present embodiment, the flange 12a and the web 12b are separated so that the flange 12a follows the bending deformation of the outer plate 10 within a predetermined range in which the joining end portion 231 exists, thereby relaxing the stress concentration.

こうしたフレーム１２は、外板１０に対して摩擦撹拌接合によって接合する前に切欠部２１が形成される。そこで、切欠部２１の形成が行われる際、スリット２５の加工も合わせて行われる。外板１０に縦通材１１が接合された後、フレーム１２は、切欠部２１によって縦通材１１を跨ぐように配置され、フランジ１２ａに沿って摩擦撹拌接合が行われる。よって、本実施形態によれば、接合後に疲労強度を向上させるための加工が不要になり、接合作業が簡素化された。そして、スリット２５によってフランジ１２ａがウェブ１２ｂから分離したことで、外板１０の変形に伴う応力集中を緩和させ、疲労破壊を防止することができる。   The frame 12 is formed with a notch 21 before being joined to the outer plate 10 by friction stir welding. Therefore, when the notch 21 is formed, the slit 25 is also processed. After the longitudinal member 11 is joined to the outer plate 10, the frame 12 is disposed so as to straddle the longitudinal member 11 by the notch portion 21, and friction stir welding is performed along the flange 12a. Therefore, according to this embodiment, the process for improving fatigue strength after joining becomes unnecessary, and the joining work is simplified. And since the flange 12a is separated from the web 12b by the slit 25, stress concentration accompanying deformation of the outer plate 10 can be relaxed, and fatigue failure can be prevented.

ところで、本実施形態は、フランジ１２ａとウェブ１２ｂとの分割によって、接合端部２３１におけるフレーム１２の剛性低下を行った。そのためにフランジ１２ａ側にスリット２５を形成したものを示したが、そのスリットはウェブ１２ｂ側に形成するものであってもよい。図４は、ウェブ１２ｂにスリット２６を形成した場合の側面図である。この場合も、切欠部２１を形成する際にスリット２６が一緒に形成できるため、接合後に疲労強度を向上させるための加工が不要になり、接合作業が簡素化された。そして、スリット２６によってフランジ１２ａがウェブ１２ｂから分離したことで、外板１０の変形に伴う応力集中を緩和させ、疲労破壊を防止することができる。   By the way, this embodiment performed the rigidity reduction of the flame | frame 12 in the joining end part 231 by division | segmentation with the flange 12a and the web 12b. For this purpose, the slit 25 is formed on the flange 12a side, but the slit may be formed on the web 12b side. FIG. 4 is a side view when the slit 26 is formed in the web 12b. Also in this case, since the slits 26 can be formed together when forming the notch portion 21, processing for improving the fatigue strength after joining becomes unnecessary, and the joining operation is simplified. And since the flange 12a is separated from the web 12b by the slit 26, stress concentration accompanying deformation of the outer plate 10 can be relaxed, and fatigue failure can be prevented.

更に、フランジ１２ａとウェブ１２ｂとを分割する他、図５及び図６に示すように、図１に示す構造に加え、フランジ１２ａの幅を狭くする直線状の切欠部２７やテーパ状の切欠部２８を形成することも有効である。なお、この切欠部２７，２８は、図４に示すウェブ１２ｂにスリット２６を形成したものとの組み合わせであっても良い。こうして切欠部２７，２８を設けることにより、接合端部２３１におけるフランジ１２ａの断面積が小さくなることにより剛性が低下し、外板１０の変形に伴う応力集中を緩和させ、疲労破壊を防止することができる。特に、テーパ状の切欠部２８は、接合端部２３１に向かって断面積が徐々に小さくなり、外板１０とフランジ１２ａとの間の剛性差も小さくなるため、応力集中の緩和に効果がある。更に、切欠部２７，２８も接合前に加工することができるため、接合作業が簡素化できる。   Furthermore, in addition to dividing the flange 12a and the web 12b, as shown in FIGS. 5 and 6, in addition to the structure shown in FIG. 1, a linear notch 27 and a tapered notch for narrowing the width of the flange 12a. It is also effective to form 28. The cutout portions 27 and 28 may be combined with the web 12b shown in FIG. 4 having the slits 26 formed therein. By providing the notches 27 and 28 in this way, the cross-sectional area of the flange 12a at the joint end 231 is reduced, so that the rigidity is reduced, the stress concentration associated with the deformation of the outer plate 10 is relaxed, and fatigue failure is prevented. Can do. In particular, the tapered notch 28 has a sectional area that gradually decreases toward the joint end 231 and a rigidity difference between the outer plate 10 and the flange 12a. . Furthermore, since the notches 27 and 28 can be processed before joining, the joining work can be simplified.

以上、本発明に係る摩擦撹拌接合の接合端部構造について実施形態を説明したが、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 mentioned above, although embodiment was described about the joining edge part structure of the friction stir welding based on this invention, this invention is not limited to this, A various change is possible in the range which does not deviate from the meaning.

１０ 外板
１１ 縦通材
１２ フレーム
２１ 切欠部
２２，２３ 接合部
２５ スリット
２３１ 接合端部
１１ａ，１２ａ フランジ
１１ｂ，１２ｂ ウェブ DESCRIPTION OF SYMBOLS 10 Outer plate 11 Longitudinal material 12 Frame 21 Notch part 22 and 23 Joint part 25 Slit 231 Joint edge part 11a, 12a Flange 11b, 12b Web

Claims (4)

一方の第１被接合部材と、その第１被接合部材の接合面に重ねて接合されるフランジ及び当該フランジから起立した状態となるウェブを備えた第２被接合部材とが、摩擦撹拌接合によって接合された場合の、当該接合部の長手方向端部に対応して形成された摩擦撹拌接合の接合端部構造において、
前記第２被接合部材は、前記接合部の長手方向端部に対応する所定の範囲に、前記フランジとウェブとを分割するスリットが形成されたものであることを特徴とする摩擦撹拌接合の接合端部構造。 Friction stir welding includes one first member to be joined, a flange that is overlapped and joined to the joining surface of the first member to be joined, and a second member to be web that stands up from the flange. In the joint end structure of the friction stir welding formed corresponding to the longitudinal direction end of the joint when joined,
Friction stir welding joining, wherein the second member to be joined is formed with a slit for dividing the flange and the web in a predetermined range corresponding to the longitudinal end of the joining portion. End structure. 請求項１に記載する摩擦撹拌接合の接合端部構造において、
前記スリットは、前記フランジ側又は前記ウェブ側に形成されたものであることを特徴とする摩擦撹拌接合の接合端部構造。 In the joint end structure of the friction stir welding according to claim 1,
The slit is formed on the flange side or the web side, and a joint end structure for friction stir welding. 請求項１又は請求項２に記載する摩擦撹拌接合の接合端部構造において、
前記フランジには、前記接合部の長手方向端部を挟んで前記スリットの反対側に切欠部が形成されたものであることを特徴とする摩擦撹拌接合の接合端部構造。 In the joint end structure of the friction stir welding according to claim 1 or claim 2,
2. A joint end structure for friction stir welding, wherein the flange is formed with a notch on the opposite side of the slit across the longitudinal end of the joint. 請求項３に記載する摩擦撹拌接合の接合端部構造において、
前記切欠部は、前記接合部の長手方向に沿って直線状に形成され、又は前記接合部の長手方向端部に向けて前記フランジの幅を狭くするようにテーパ状に形成されたものであることを特徴とする摩擦撹拌接合の接合端部構造。 In the joint end structure of the friction stir welding according to claim 3,
The notch is linearly formed along the longitudinal direction of the joint, or is tapered so as to narrow the width of the flange toward the longitudinal end of the joint. A joint end structure of friction stir welding characterized by that.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9026A (en) * 1852-06-15 Improvement in imitation stone
US9028A (en) * 1852-06-15 David kood
JP2005169413A (en) * 2003-12-08 2005-06-30 Mitsubishi Heavy Ind Ltd Lap welded joint by fsw, and method of improving its fatigue strength
JP2005239029A (en) * 2004-02-27 2005-09-08 Kawasaki Heavy Ind Ltd Railway vehicle structural body
JP2007269197A (en) * 2006-03-31 2007-10-18 Kawasaki Heavy Ind Ltd Structure for high-speed movement

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9026A (en) * 1852-06-15 Improvement in imitation stone
US9028A (en) * 1852-06-15 David kood
JP2005169413A (en) * 2003-12-08 2005-06-30 Mitsubishi Heavy Ind Ltd Lap welded joint by fsw, and method of improving its fatigue strength
JP2005239029A (en) * 2004-02-27 2005-09-08 Kawasaki Heavy Ind Ltd Railway vehicle structural body
JP2007269197A (en) * 2006-03-31 2007-10-18 Kawasaki Heavy Ind Ltd Structure for high-speed movement

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