JP3419994B2 - Joint for liquid phase diffusion joining of steel pipe with high joining strength - Google Patents
Joint for liquid phase diffusion joining of steel pipe with high joining strengthInfo
- Publication number
- JP3419994B2 JP3419994B2 JP13538496A JP13538496A JP3419994B2 JP 3419994 B2 JP3419994 B2 JP 3419994B2 JP 13538496 A JP13538496 A JP 13538496A JP 13538496 A JP13538496 A JP 13538496A JP 3419994 B2 JP3419994 B2 JP 3419994B2
- Authority
- JP
- Japan
- Prior art keywords
- inclined surface
- steel pipe
- joint
- liquid phase
- joining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、金属材料の液相拡
散接合用継手、詳しくは炭素鋼、合金鋼鋼管の突き合わ
せ接合に際し、高い接合強度が得られる液相拡散接合用
継手に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid phase diffusion bonding joint for metallic materials, and more particularly to a liquid phase diffusion bonding joint capable of obtaining high joint strength in butt jointing of carbon steel and alloy steel pipes.
【０００２】[0002]
【従来の技術】鋼管は、内部の液体を搬送する目的で、
一般に軸方向に円形の断面を有する鋼構造体或いは部品
であって、工場で工業的に製造する場合には、長さにお
いて定められた寸法（規格、製造設備制約、使用者側都
合等による）を有しており、輸送上有利となるものの、
実際の使用においては定寸で製造した鋼管どうしを連
結、即ち長尺の構造体或いは部品と部品とを連結する構
造体として完成させ、使用するのが通例であって、ここ
に、鋼管の連結が必須の工業技術として位置付けられる
こととなる。2. Description of the Related Art Steel pipes are used to convey the liquid inside.
Generally, a steel structure or part having a circular cross section in the axial direction, and when it is industrially manufactured in a factory, the dimension defined by the length (due to standards, manufacturing facility restrictions, user convenience, etc.) And has an advantage in transportation,
In actual use, it is customary to connect steel pipes manufactured with a certain size, that is, to complete and use a long structure or a structure for connecting parts to each other. Will be positioned as an essential industrial technology.
【０００３】鋼管の連結の方法には、一般に、各鋼管
管端にフランジを設けてボルト等で固定し、面圧をもっ
て接合する方法、溶融溶接によって金属的に一体化さ
せる方法、鋼管管端に雌雄のネジを事前に加工し、現
地でネジ結合して摩擦力によって発生する面圧で連結す
る方法、等がある。これらのうち、の溶融溶接法には
いくつかの異なる形式があって、熱源、溶接材料、スラ
グ、溶接速度、溶接雰囲気等がそれぞれ異なり、特徴を
有する様々な溶接方法が工業的に実用化されている。[0003] Generally, steel pipes are connected by a method in which a flange is provided at each steel pipe end and fixed with bolts or the like and joined by surface pressure, a method of metal integration by fusion welding, and a steel pipe end. There is a method in which male and female screws are processed in advance, and they are screw-coupled at the site and connected by the surface pressure generated by frictional force. Of these, there are several different types of fusion welding methods, each of which has a different heat source, welding material, slag, welding speed, welding atmosphere, etc. ing.
【０００４】しかるに、近年は鋼管内部の搬送流体或い
は鋼管の使用される場所の環境因子が従来に比較して多
岐にわたる傾向にあり、厳しい腐食環境下、高温下で腐
食性流体、高圧力流体を搬送したり、高荷重下で使用さ
れたりする事例が増えつつある。従って、鋼管の材質が
高級化し、これとは逆比例して鋼管の溶接性が低下する
傾向にあるのが実情である。Ｎｉ、Ｃｒ、Ｃｏ、Ｂ、Ｍ
ｎ、Ｃ、Ｎ等を多く含有する材料では溶接が極めて困難
であり、溶接後の継手にも特殊な後熱処理を施す必要の
あるものが多い。一部は全く溶接できない高強度鋼管或
いは高合金鋼管も工業的に製造されており、この場合、
上述の、のような非溶融式の連結方式が有利とな
る。ところが、フランジ加工或いは高精度のネジ加工は
極めて施工時間、コスト共に高く、現状では多用が難し
くなりつつあり、熟練者の技術を必要とし、施工時間の
長い溶融溶接もまた、工業的に適用困難となりつつあ
る。However, in recent years, the carrier fluid inside the steel pipe or the environmental factors at the place where the steel pipe is used tend to be more diverse than in the past, and corrosive fluids and high-pressure fluids are used under severe corrosive environments and high temperatures. Increasingly cases are being carried and used under high load. Therefore, in reality, the quality of the steel pipe becomes higher, and the weldability of the steel pipe tends to decrease in inverse proportion to this. Ni, Cr, Co, B, M
Welding is extremely difficult with materials containing a large amount of n, C, N, etc., and many joints after welding also require special post heat treatment. High strength steel pipes or high alloy steel pipes that cannot be welded at all are also industrially manufactured. In this case,
The non-melting connection method as described above is advantageous. However, flanging or high-precision screw processing is extremely expensive in terms of construction time and cost, and it is becoming difficult to use a lot at present, requiring skill of a skilled person, and fusion welding with a long construction time is also industrially difficult to apply. Is becoming.
【０００５】そこで、溶融溶接なみの接合継手品質を有
し、熟練技術が不要であって、かつ接合時間の短縮も可
能な液相拡散接合による接合継手が注目されるようにな
ってきた。液相拡散接合は、接合しようとする材料の間
に箔、粉末、或いはメッキ等の形態で被接合材よりも融
点の低い共晶組成を有する合金を介在させて加圧し、挿
入合金（以下インサートメタルと称する）の液相線直上
の温度に接合部を加熱することによって、溶融、等温凝
固させる接合法であり、固相接合法の一種と考えられて
いる。Therefore, a liquid phase diffusion bonding joint, which has the quality of the joint joint similar to that of fusion welding, does not require skill and is capable of shortening the joining time, has been attracting attention. In liquid phase diffusion bonding, an alloy having a eutectic composition whose melting point is lower than that of a material to be joined is interposed between materials to be joined, and a pressure is applied to the material to be joined. It is a joining method of melting and isothermally solidifying by heating the joining portion to a temperature just above the liquidus line of metal), and is considered to be a kind of solid-state joining method.
【０００６】液相拡散接合は比較的低い加圧力で接合で
きることから、接合による残留応力や、変形を極力避け
る必要のある接合に用いられ、同時に溶接の困難な高合
金鋼、耐熱鋼の接合にも適用されている技術である。さ
らに、接合現象そのものである等温凝固を支配する元素
の相互拡散が極めて早いことから、接合のための加熱手
段を適当に選べば、接合時間を短縮できる可能性もあ
る。Since liquid phase diffusion welding can be performed with a relatively low pressure, it is used for welding where it is necessary to avoid residual stress and deformation due to welding, and at the same time for welding high alloy steel and heat resistant steel that are difficult to weld. Is also applied technology. Furthermore, since the mutual diffusion of the elements that control the isothermal solidification, which is the bonding phenomenon itself, is extremely fast, there is a possibility that the bonding time can be shortened by appropriately selecting the heating means for the bonding.
【０００７】一方、液相拡散接合によって接合しようと
する材料は多くの場合、合金組成として０．５０％以上
のＣｒを含有する。Ｃｒ含有材料は緻密な酸化Ｃｒ（多
くの場合Ｃｒ2 Ｏ3 ）皮膜を表面に形成するために、耐
酸化性、耐食性が優れているのが特徴である。従って、
接合時の加熱によっても当然接合面には酸化皮膜が形成
されることとなり、溶融したインサートメタルの濡れが
阻害され、接合に必要な原子の拡散が著しく妨げられ
る。On the other hand, in many cases, the material to be joined by liquid phase diffusion joining contains 0.50% or more of Cr as an alloy composition. The Cr-containing material is characterized by excellent oxidation resistance and corrosion resistance because it forms a dense Cr oxide (often Cr 2 O 3 ) film on the surface. Therefore,
Of course, the heating at the time of bonding also forms an oxide film on the bonding surface, which impedes the wetting of the melted insert metal and significantly hinders the diffusion of atoms necessary for bonding.
【０００８】故に、従来は特開昭５３−８１４５８号公
報、特開昭６２−３４６８５号公報、さらに特開昭６２
−２２７５９５号公報に見られるように、いずれも接合
の際には雰囲気を真空、不活性、もしくは還元性に保た
なければならず、接合の長時間化ひいてはコストの著し
い上昇を招いていた。Therefore, in the prior art, JP-A-53-81458, JP-A-62-34685, and JP-A-62-62685 are known.
As disclosed in Japanese Patent Laid-Open No. 227595, in all cases, the atmosphere must be kept vacuum, inactive, or reductive at the time of bonding, which leads to a long bonding time and a significant increase in cost.
【０００９】本発明者らは種々研究を重ねた結果、成分
としてＶを含有するインサートメタルは酸化雰囲気中で
も液相拡散接合が可能であることを見いだした。しか
も、Ｖはインサートメタルの融点を上昇させる元素では
あるが、他の元素（本発明においては専らＳｉ）を適当
に調整することで接合性の極めて優れたインサートメタ
ルを得ることができることを見いだし、Ｖを含有した全
く新しい、酸化雰囲気中での接合が可能な液相拡散接合
用合金箔に関する技術を、既に第１８９１６１８号、第
１８９１６１９号、第１８３７５７２号特許として提案
し登録を受けている。As a result of various studies, the inventors of the present invention have found that an insert metal containing V as a component can be liquid phase diffusion bonded even in an oxidizing atmosphere. Moreover, although V is an element that raises the melting point of the insert metal, it has been found that an insert metal having extremely excellent bondability can be obtained by appropriately adjusting other elements (in the present invention, exclusively Si). A completely new technology containing a V-containing alloy foil for liquid phase diffusion bonding capable of bonding in an oxidizing atmosphere has already been proposed and registered as patents No. 1891618, No. 1891619 and No. 1837572.
【００１０】これら全く新しい、高速な液相拡散接合技
術が完成したことにより、接合時間の短縮化は実現さ
れ、益々新しい鋼管継手の製造方法としての液相拡散接
合に対する期待度が高まりつつある。The completion of these completely new high-speed liquid phase diffusion bonding techniques has realized the reduction of the bonding time, and the expectation for liquid phase diffusion bonding as an increasingly new method for manufacturing a steel pipe joint is increasing.
【００１１】[0011]
【発明が解決しようとする課題】液相拡散接合法を接合
技術として捉えた場合、その接合パラメータとして接合
特性を左右する条件の一つは接合面積である。特に、大
型の構造体を接合する場合は、接合面の工業的加工精度
と接合面に付加する応力の均一性との関係から、接合面
積は大きく、かつその全面が完全に接合している方が高
い継手強度を得ることは説明するまでもない。When the liquid phase diffusion bonding method is regarded as a bonding technique, one of the conditions that influences the bonding characteristics as its bonding parameter is the bonding area. In particular, when joining large structures, the joint area is large and the entire surface is completely joined due to the relationship between the industrial processing accuracy of the joint surface and the uniformity of the stress applied to the joint surface. It goes without saying that a high joint strength can be obtained.
【００１２】ところが、鋼管はその使用用途に応じて種
々の外径、管の肉厚等の寸法を有し、鋼管どうしを連結
接合する場合、接合面積は、継手開先形状がＩ型の場
合、ほぼ肉厚で決定されてしまう。そこで、少しでも接
合面積を拡張するために、突き合わせ面を、鋼管表面に
対して垂直ではなく、ある程度傾斜させた開先が可能で
あり、特開平５−１２３８９０号公報にはその技術思想
と、使用する箔の形状および製造方法に関する記述があ
る。However, steel pipes have various outer diameters, wall thicknesses, etc., depending on the intended use, and when connecting steel pipes together, the joint area is when the joint groove shape is I-shaped. , It is decided by the thickness. Therefore, in order to expand the joining area as much as possible, it is possible to form a groove in which the abutting surface is not perpendicular to the steel pipe surface but is inclined to some extent, and Japanese Patent Laid-Open No. 5-123890 discloses its technical concept and There is a description of the shape of the foil used and the manufacturing method.
【００１３】しかし、液相拡散接合技術を広範囲に適用
するに当たり、接合応力を極力高めるには、さらなる突
き合わせ面積の増加が必要である。そこで、本発明者ら
は鋼管継手形状についてさらなる解析と研究を加え、２
段或いは３段の傾斜面を有する大突き合わせ面積の継手
形状を完成するに至った。However, in applying the liquid phase diffusion bonding technique to a wide range, it is necessary to further increase the abutting area in order to increase the bonding stress as much as possible. Therefore, the present inventors added further analysis and research on the shape of the steel pipe joint, and
We have completed a joint shape with a large butt area having a step or a three-step inclined surface.
【００１４】[0014]
【課題を解決するための手段】本発明の要旨は次の通り
である。
（１）２つの鋼管の端部を相互に突き合わせ液相拡散接
合するための継手において、一方の鋼管の端部に、鋼管
外表面側から外表面の垂線とのなす角度Ａが５°〜８５
°の第１傾斜面と、該第１傾斜面に続く鋼管内表面の垂
線とのなす角度Ｂが５°〜８５°の第２傾斜面とを有
し、第１傾斜面と第２傾斜面とのなす角度Ｃを０°〜８
５°とした接合開先を形成し、他方の鋼管端部に、前記
一方の鋼管端部と隙間なく嵌合し得る如く、一方の鋼管
端部に形成した傾斜面と対応した角度Ｄ，Ｅ，Ｆをそれ
ぞれ有する第１傾斜面及び第２傾斜面を有する接合開先
を形成すると共に、接合時の両開先間に、厚さ５〜３０
０μｍで前記開先形状に合致する形状の、液相接合可能
な非晶質金属箔を配置させて接合時の開先接触面積を増
加させ、継手全長が鋼管肉厚ｔの２ｔ〜１０００mmであ
ることを特徴とする接合強度の高い鋼管の液相拡散接合
用継手。
（２）突き合わせる２つの鋼管端部の接合開先における
第１傾斜面及び第２傾斜の間に、第３傾斜面をそれぞれ
設け、第１傾斜面と第３傾斜面とのなす角度Ｇ，Ｉと第
３傾斜面と第２傾斜面とのなす角度Ｈ，Ｊは、いずれも
５°〜８５°としたことを特徴とする（１）記載の接合
強度の高い鋼管の液相拡散接合用継手。The gist of the present invention is as follows. (1) In a joint for abutting the ends of two steel pipes against each other for liquid-phase diffusion bonding, an angle A between the outer surface side of the steel pipe and a perpendicular to the outer surface is 5 ° to 85 at one end of the steel pipe.
And a second inclined surface having an angle B of 5 ° to 85 ° between the first inclined surface and the perpendicular to the inner surface of the steel pipe following the first inclined surface, and the first inclined surface and the second inclined surface. The angle C with is 0 ° to 8
Angles D and E corresponding to the inclined surfaces formed at one steel pipe end portion are formed so that a joint groove having a 5 ° angle is formed and the other steel pipe end portion can be fitted into the one steel pipe end portion without a gap. , F each having a first inclined surface and a second inclined surface, and a thickness of 5 to 30 between both grooves at the time of joining.
Amorphous metal foil capable of liquid phase bonding having a shape that matches the groove shape at 0 μm is arranged to increase the groove contact area at the time of bonding, and the total joint length is 2t to 1000 mm of the steel pipe wall thickness t. A joint for liquid phase diffusion bonding of steel pipes having high bonding strength, which is characterized by the above. (2) A third inclined surface is provided between the first inclined surface and the second inclined surface in the joint groove of the two steel pipe ends to be abutted to each other, and an angle G formed between the first inclined surface and the third inclined surface, Angles H and J formed by I, the third inclined surface and the second inclined surface are both 5 ° to 85 °, for liquid phase diffusion welding of a steel pipe having high joining strength according to (1). Fittings.
【００１５】[0015]
【発明の実施の形態】本発明を図面に基づいてさらに詳
細に説明する。図１は２段の傾斜面で形成した開先を有
する本発明の継手の実施形態を示すものである。突き合
わせる２本の鋼管１、２の端部に形成する接合開先は、
断面で示すと次のようになる。即ち、一方（図面左方）
の鋼管１の端部において、鋼管外表面３から内表面４に
向かって右下がりの連続する２つの傾斜面５、６を形成
する。傾斜面のうち第１の傾斜面５は、鋼管外表面３の
垂線７に対する角度Ａが５°〜８５°の範囲であり、か
つ、第２の傾斜面６は、鋼管内表面４の垂線８に対する
角度Ｂが５°〜８５°の範囲とすることが必要である。
そして、これら第１傾斜面５と第２傾斜面６のなす角度
Ｃが０°〜８５°の範囲にある。The present invention will be described in more detail with reference to the drawings. FIG. 1 shows an embodiment of the joint of the present invention having a groove formed by two inclined surfaces. The joint groove formed at the ends of the two steel pipes 1 and 2 to be butted is
The cross section is as follows. That is, one side (left side of the drawing)
At the end of the steel pipe 1, the two inclined surfaces 5 and 6 are formed continuously downwardly from the outer surface 3 to the inner surface 4 of the steel pipe. Of the inclined surfaces, the first inclined surface 5 has an angle A in the range of 5 ° to 85 ° with respect to the perpendicular 7 of the steel pipe outer surface 3, and the second inclined surface 6 has the perpendicular 8 of the steel pipe inner surface 4. It is necessary that the angle B with respect to is in the range of 5 ° to 85 °.
The angle C formed by the first inclined surface 5 and the second inclined surface 6 is in the range of 0 ° to 85 °.
【００１６】また、他方（図面右方）の鋼管２の端部に
おいては、上記した一方の鋼管１の端部と隙間なく嵌合
し得る如く、一方の鋼管端部に形成した傾斜面と対応し
た角度を形成した傾斜面を有する。即ち、鋼管２の外表
面９から内表面１０に向かって右下がりの連続する２つ
の傾斜面１１、１２を形成する。傾斜面のうち第１の傾
斜面１１は、鋼管外表面９の垂線１３に対する角度Ｄが
５°〜８５°の範囲であり、かつ、第２の傾斜面１２
は、鋼管内表面１０の垂線１４に対する角度Ｅが同じく
５°〜８５°の範囲とすることが必要である。そして、
これら第１傾斜面１１と第２傾斜面１２のなす角度Ｆは
０°〜８５°の範囲にある。The other end (right side of the drawing) of the steel pipe 2 corresponds to an inclined surface formed on one end of the steel pipe 1 so that the end can be fitted with the end of the one steel pipe 1 without a gap. It has an inclined surface forming an angle. That is, the two inclined surfaces 11 and 12 that are continuous downward from the outer surface 9 to the inner surface 10 of the steel pipe 2 are formed. Of the inclined surfaces, the first inclined surface 11 has an angle D with respect to the perpendicular 13 of the steel pipe outer surface 9 in the range of 5 ° to 85 °, and the second inclined surface 12
Requires that the angle E of the inner surface 10 of the steel pipe with respect to the vertical line 14 is also in the range of 5 ° to 85 °. And
The angle F formed by the first inclined surface 11 and the second inclined surface 12 is in the range of 0 ° to 85 °.
【００１７】突き合わせる鋼管１、２の接合開先は上記
のように形成するが、本発明ではこれらを接合する際に
両開先間に、前記開先形状に合致する形状の、つまり断
面が２つの傾斜面を有する液相接合可能なリング状の非
晶質金属箔１５を配置させて、接合時の開先接触面積を
増加させることを特徴としている。該非晶質金属箔１５
は、その厚さは５〜３００μｍで、かつ、継手全長が鋼
管肉厚の２倍（即ち、肉厚をｔとすれば２ｔ）以上１０
００mm以下である。The joint groove of the steel pipes 1 and 2 to be butted is formed as described above. In the present invention, however, when joining these, a shape having a shape matching the groove shape, that is, a cross section, is formed between both groove portions. A ring-shaped amorphous metal foil 15 having two inclined surfaces and capable of liquid phase bonding is arranged to increase the groove contact area at the time of bonding. The amorphous metal foil 15
Has a thickness of 5 to 300 μm, and the total length of the joint is at least twice the wall thickness of the steel pipe (that is, 2t if the wall thickness is t) 10 or more.
It is less than 00 mm.
【００１８】次に、図２は３段の傾斜面で形成した開先
を有する本発明の継手の実施形態を示すものである。図
示するように、一方の鋼管１の端部に、角度Ａと角度Ｂ
を有する第１傾斜面５と第２傾斜面６を設けることは図
１と同様であるが、図２においては、これら第１傾斜面
５と第２傾斜面６の間に、第３傾斜面１６を付け加えて
３段の傾斜面としている。そして該傾斜面１６と第１傾
斜面５のなす角度Ｇと傾斜面１６と第２傾斜面６のなす
角度Ｈは、５°〜８５°の間の値をとり、また、他方の
鋼管２の端部についても、前記一方の鋼管１の端部と突
き合わせたとき、隙間なく嵌合するように開先を形成す
る。即ち、鋼管２の第１傾斜面１１と第２傾斜面１２の
間に、第３傾斜面１７を付け加えて３段の傾斜面として
いる。そして該傾斜面１７と第１傾斜面１１のなす角度
Ｉと傾斜面１７と第２傾斜面１２のなす角度Ｊを、５°
〜８５°の範囲としている。Next, FIG. 2 shows an embodiment of the joint of the present invention having a groove formed by three inclined surfaces. As shown in the figure, the angle A and the angle B are attached to one end of the steel pipe 1.
The provision of the first inclined surface 5 and the second inclined surface 6 is similar to that of FIG. 1, but in FIG. 2, a third inclined surface is provided between the first inclined surface 5 and the second inclined surface 6. 16 is added to form a three-step inclined surface. The angle G formed by the inclined surface 16 and the first inclined surface 5 and the angle H formed by the inclined surface 16 and the second inclined surface 6 have a value between 5 ° and 85 °, and the other steel pipe 2 As for the end portion, when the end portion of the one steel pipe 1 is butted, a groove is formed so that the end portion is fitted with no gap. That is, the third inclined surface 17 is added between the first inclined surface 11 and the second inclined surface 12 of the steel pipe 2 to form a three-step inclined surface. The angle I formed by the inclined surface 17 and the first inclined surface 11 and the angle J formed by the inclined surface 17 and the second inclined surface 12 are 5 °.
The range is up to 85 °.
【００１９】なお、図２においても図１の例と同様に、
液相接合可能な非晶質金属箔１８を継手間に介在させる
が、該非晶質金属箔１８は３段の傾斜面を有するもの
で、厚み５〜３００μｍとする。また、継手全長も鋼管
肉厚の２倍（即ち、肉厚をｔとすれば２ｔ）以上１００
０mm以下とする。In FIG. 2, as in the example of FIG. 1,
An amorphous metal foil 18 capable of liquid phase bonding is interposed between the joints. The amorphous metal foil 18 has three-step inclined surfaces and has a thickness of 5 to 300 μm. Also, the total length of the joint is at least twice the wall thickness of the steel pipe (that is, 2t when the wall thickness is t), and 100 or more.
It should be 0 mm or less.
【００２０】以下、本発明の鋼管継手形状を請求項１、
２に記載の如く特定した理由について説明する。本発明
において図１の２段の傾斜面を開先継手面に付与したの
は、図３の従来の鋼管開先に比較して開先面積を大きく
とれることが最大の理由である。図２の３段にした例で
は、さらに開先面積を大きくとれることになる。The shape of the steel pipe joint of the present invention will be described below.
The reason specified as described in 2 will be described. In the present invention, the reason why the two-step inclined surface of FIG. 1 is provided to the groove joint surface is the largest reason that the groove area can be made larger than that of the conventional steel pipe groove of FIG. In the example of the three stages shown in FIG. 2, the groove area can be further increased.
【００２１】次に、鋼管内外表面と、それに続く開先の
傾斜面間の角度、Ａ，Ｂ，Ｄ，Ｅを５°〜８５°の範囲
としたのは、完全な垂直面よりも鋼管どうしの突き合わ
せ時の芯あわせを容易にし、かつ、傾斜させることで接
合面積拡大を図ったことに他ならない。この角度を特定
する上で重要なことは、傾斜角度を有するインサートメ
タルを工業的に鋳造する技術上の制約によるものであっ
て、０°〜５°未満或いは８５°超〜９０°の角度で
は、箔の製造コストが高騰し不利となるためであり、９
０°以上、或いは０°以下の傾斜角を有する箔は、現在
の技術では工業的な製造が極めて困難であることによ
る。この制約は、他の角度Ｃ，Ｆ、或いは第３の傾斜面
を付与した場合の角度Ｇ，Ｈ，Ｉ，Ｊの角度の範囲の制
限にも反映されている。Next, the angles A, B, D and E between the inner and outer surfaces of the steel pipe and the subsequent inclined faces of the groove are set to be in the range of 5 ° to 85 ° because the steel pipes are more than the perfectly vertical faces. It is nothing but the aim of expanding the joint area by facilitating the center alignment at the time of butting and inclining. What is important in specifying this angle is due to the technical limitation of industrially casting insert metal having a tilt angle, and at an angle of 0 ° to less than 5 ° or more than 85 ° to 90 °, This is because the foil manufacturing cost rises and it is disadvantageous.
A foil having a tilt angle of 0 ° or more or 0 ° or less is extremely difficult to industrially manufacture with the current technology. This constraint is also reflected in the other angles C, F or the limitation of the range of the angles G, H, I, J when the third inclined surface is provided.
【００２２】また、これらの形状を有する継手を用いて
鋼管を連結接合する場合、その接合方法が液相拡散接合
であるため、液相拡散接合特有の制限が、形状に必要と
なる。即ち、接合面の粗さは３００μｍ以下の凹凸であ
ること、接合圧力は鋼管軸方向に１MPa 以上であること
などであり、雰囲気に関する制限は、大気中での液相拡
散接合が可能な箔を適用する場合においては全くなく、
酸化雰囲気中での適用も可能である。When steel pipes are joint-joined by using joints having these shapes, the joining method is liquid-phase diffusion joining, so that the shape is required to have restrictions specific to liquid-phase diffusion joining. That is, the roughness of the joint surface is unevenness of 300 μm or less, the joining pressure is 1 MPa or more in the axial direction of the steel pipe, and the atmosphere is restricted by a foil that can be liquid phase diffusion bonded in the atmosphere. None at all when applied,
Application in an oxidizing atmosphere is also possible.
【００２３】さらに、液相拡散接合は概略８８０〜１２
５０℃において達成される接合であるから、該温度領域
に加熱する必要があり、かつその保持時間は最低でも１
分が必要である。加熱用の熱源に関する制限は全くな
く、高速の高周波加熱或いは溶接用熱源の転用なども有
用であり、本発明の効果を高める。加熱後の冷却方法、
冷却手段については全く制限はない。Further, liquid phase diffusion bonding is generally 880-12.
Since the bonding is achieved at 50 ° C., it is necessary to heat in the temperature range and the holding time is at least 1
I need a minute. There is no limitation on the heat source for heating, high-speed high-frequency heating or diversion of a heat source for welding is also useful, and enhances the effect of the present invention. Cooling method after heating,
There is no restriction on the cooling means.
【００２４】尚、本発明において「酸化雰囲気」とは、
接合雰囲気中に体積％で０．１％以上の酸素ガスを含有
し、酸素分圧が１０-3 atm以上、即ち還元性ガス、例え
ばＨ2 ，Ｈ2 Ｓ，水蒸気その他を含有している場合で
も、酸化力が酸素濃度相当で０．１％以上である雰囲気
を意味する。また、「融点」とは、２元以上の合金にお
いては、その状態図上での固相線を、特に断らない限り
において意味する。In the present invention, "oxidizing atmosphere" means
When the bonding atmosphere contains 0.1% or more by volume of oxygen gas and has an oxygen partial pressure of 10 -3 atm or more, that is, contains a reducing gas such as H 2 , H 2 S, steam or the like. However, it means an atmosphere having an oxidizing power of 0.1% or more corresponding to the oxygen concentration. Further, the “melting point” means a solidus line on a phase diagram of a binary or more alloy, unless otherwise specified.
【００２５】[0025]
【実施例】表１に示す４種類の鋼管（製造方法は表中に
記述した通りで、Ｅは電気抵抗溶接によって連続造管し
た電縫鋼管、Ｓはシームレス圧延法或いは熱間押出法、
若しくは鍛造法により製造したシームレス鋼管、Ｕは厚
板圧延を施した所定の化学成分を有する厚板鋼板をＵ−
Ｏ成形プレスし、シーム部をＳＡＷ溶接して製造したＵ
Ｏ鋼管である）を突き合わせ接合に液相拡散接合手段を
用いて接合した。使用した液相拡散接合用合金箔（全体
はリング状となっている）は、表２に示す３種類で、表
中１，２はＮｉ−Ｓｉ−Ｂ、Ｎｉ−Ｐ系の市販のインサ
ートメタルである。３は大気中での液相拡散接合が可能
な特許第１８９１６１８号の範囲の組成を有する合金非
晶質箔である。EXAMPLES Four kinds of steel pipes shown in Table 1 (manufacturing methods are as described in the table, E is an electric resistance welded steel pipe continuously produced by electric resistance welding, S is a seamless rolling method or a hot extrusion method,
Alternatively, a seamless steel pipe manufactured by a forging method, U is a thick steel plate having a predetermined chemical composition, which has been subjected to thick plate rolling, U-
U produced by O-forming press and SAW welding of seam
O steel pipe) was joined to the butt joint using liquid phase diffusion joining means. The liquid phase diffusion bonding alloy foils used (all are ring-shaped) are of three types shown in Table 2, where 1 and 2 are commercially available insert metals of Ni-Si-B and Ni-P type. Is. No. 3 is an alloy amorphous foil having a composition within the range of Japanese Patent No. 1891618 capable of liquid phase diffusion bonding in the atmosphere.
【００２６】表１に示すいずれかの鋼管（外径１０１．
６mm、２０３．２mm、３５６．６mmのいずれか）に本発
明の請求項１又は２に示す形態の開先形状を加工した雌
雄鋼管を用意し、表２に示すいずれかの接合助剤（イン
サートメタル）を、開先形状に合わせて単ロール急冷凝
固鋳造し、開先間に挟み込んだ。Any of the steel pipes shown in Table 1 (outer diameter 101.
6 mm, 203.2 mm, or 356.6 mm) to prepare a male and female steel pipe in which the groove shape of the form shown in claim 1 or 2 of the present invention is processed, and one of the joining aids (inserts shown in Table 2) Metal) was single-roll rapidly solidified and cast according to the shape of the groove, and sandwiched between the grooves.
【００２７】組み立てた継手を、軸方向１〜２０MPa の
応力を付加させ、高周波誘導加熱コイル（有効加熱帯が
最大１ｍのもの）を用いて、継手開先部分が完全に有効
加熱帯（加熱コイルによって設定された温度に、均一
（±５℃以内）に制御される領域）に含まれることを予
備実験によって確認した後に、接合温度（８８０〜１２
５０℃の範囲の温度）に１〜９０分間真空中（必要な場
合は真空度１０-4Torrを達成可能な真空チャンバ内を準
備した）あるいは大気中に継手を保持し、続いて空冷、
水冷、油冷などの冷却を適宜施し、さらに継手によって
は３０分〜２時間程度の焼戻し処理を兼ねた均質拡散処
理を施した。The assembled joint is subjected to a stress of 1 to 20 MPa in the axial direction, and a high-frequency induction heating coil (having an effective heating zone of 1 m at the maximum) is used. After confirming by a preliminary experiment that the temperature set by the above is included in a region controlled uniformly (within ± 5 ° C), the bonding temperature (880-12
Holding the joint in vacuum (temperature in the range of 50 ° C.) for 1 to 90 minutes (in a vacuum chamber capable of attaining a vacuum degree of 10 −4 Torr if necessary) or in air, followed by air cooling,
Cooling such as water cooling and oil cooling was appropriately performed, and further, depending on the joint, a homogeneous diffusion treatment that also serves as a tempering treatment for about 30 minutes to 2 hours was performed.
【００２８】得られた継手は、図４に示すように、接合
鋼管継手１９の軸方向の引張試験によって継手強度を評
価した。なお、インサートメタルの厚みは、１０〜１２
０μｍのものを準備した。The joint strength of the joint thus obtained was evaluated by an axial tensile test of the joined steel pipe joint 19 as shown in FIG. The thickness of the insert metal is 10 to 12
The one with 0 μm was prepared.
【００２９】[0029]
【表１】 [Table 1]
【００３０】[0030]
【表２】 [Table 2]
【００３１】表３は本発明における一部の接合条件と評
価結果をまとめて示したものである。表中にて開先接触
長さとあるのは、図５に示したように、鋼管の継手開先
の軸線を通過する断面で切断した断面図において、雌雄
の開先がその間に非晶質液相拡散接合用合金箔（インサ
ートメタル）を挟んで突き合う、いわゆる開先面の、断
面図上の内表面から外表面あるいはその逆の方向への総
長であり、図５（ａ）、（ｂ）共に太い線分で示した長
さである。断面図においては、鋼管継手の軸線を挟んで
上下対称の形態をとるが、表中に示した長さとは、その
一方の長さに限定した。Table 3 collectively shows some bonding conditions and evaluation results in the present invention. The groove contact length in the table is, as shown in FIG. 5, a cross-sectional view taken along a cross section passing through the axis of the joint groove of the steel pipe. 5 (a) and 5 (b) are the total lengths of so-called groove surfaces, which face each other with an alloy foil for phase diffusion bonding (insert metal) sandwiched therebetween, from the inner surface to the outer surface in the sectional view or the opposite direction. ) Both are lengths indicated by thick line segments. In the cross-sectional view, the shape is vertically symmetrical with respect to the axis of the steel pipe joint, but the length shown in the table is limited to one of the lengths.
【００３２】表３の本発明例に対して表４の比較例は、
全て溶接開先接触長が本発明の範囲から外れるもので、
加熱コイル外まで開先面が達してしまい、接合が不可能
であった場合である。Compared with the examples of the present invention in Table 3, the comparative examples in Table 4 are:
All welding groove contact length is out of the scope of the present invention,
This is the case where the groove surface reaches the outside of the heating coil and joining is impossible.
【００３３】[0033]
【表３】 [Table 3]
【００３４】[0034]
【表４】 [Table 4]
【００３５】[0035]
【表５】 [Table 5]
【００３６】[0036]
【発明の効果】以上説明したように本発明に係る鋼管継
手によれば、液相拡散接合により接合応力を高め、か
つ、突き合わせ面積の増大が図れるため、接合強度の高
い継手を得ることができた。As described above, according to the steel pipe joint of the present invention, since the joint stress can be increased by the liquid phase diffusion joining and the abutting area can be increased, the joint having high joint strength can be obtained. It was
【図１】本発明に係る鋼管継手の一例を示すもので、２
段の傾斜開先面を有する雌雄継手の軸方向断面図の上下
対称な図のうち、上半分の模式図である。FIG. 1 shows an example of a steel pipe joint according to the present invention.
It is a schematic diagram of an upper half among the up-and-down symmetrical views of an axial cross-sectional view of a male and female joint having a stepped grooved surface.
【図２】本発明に係る鋼管継手の他の例を示すもので、
３段の傾斜開先面を有する雌雄継手の軸方向断面図の上
下対称な図のうち、上半分の模式図である。FIG. 2 shows another example of the steel pipe joint according to the present invention,
It is a schematic diagram of an upper half among the up-and-down symmetrical views of the axial cross-sectional view of the male and female joint having the three-step inclined groove faces.
【図３】従来の単純１段の傾斜面を有する雌雄鋼管継手
の軸方向断面の模式図である。FIG. 3 is a schematic diagram of an axial cross-section of a conventional male and female steel pipe joint having a simple one-step inclined surface.
【図４】接合済みの鋼管継手とその軸線方向を示す図。FIG. 4 is a view showing a joined steel pipe joint and its axial direction.
【図５】本発明の実施例における継手の接触長さ説明す
るための図。FIG. 5 is a diagram for explaining a contact length of a joint in the example of the present invention.
【符号の説明】 １，２ 接合すべき鋼管 ３，９ 鋼管外表面 ４，１０ 鋼管内表面 ５，１１ 鋼管の第１傾斜面 ６，１２ 鋼管の第２傾斜面 ７，８，１３，１４ 鋼管表面に対する垂線 １５，１８ 非晶質金属箔 １９ 接合した鋼管[Explanation of symbols] 1,2 Steel pipes to be joined 3,9 Steel pipe outer surface 4,10 Steel pipe inner surface 5,11 First inclined surface of steel pipe 6,12 Second inclined surface of steel pipe 7,8,13,14 Perpendicular to steel pipe surface 15,18 Amorphous metal foil 19 Joined steel pipes
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平８−247349（ＪＰ，Ａ) 特開 昭61−99590（ＪＰ，Ａ) 特開 平３−210978（ＪＰ，Ａ) 実開 昭62−141985（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F16L 13/02 B23K 20/00 310 F16D 1/02 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-8-247349 (JP, A) JP-A-61-99590 (JP, A) JP-A-3-210978 (JP, A) Actual development Sho-62- 141985 (JP, U) (58) Fields surveyed (Int.Cl. 7 , DB name) F16L 13/02 B23K 20/00 310 F16D 1/02
Claims (2)
相拡散接合するための継手において、一方の鋼管の端部
に、鋼管外表面側から外表面の垂線とのなす角度Ａが５
°〜８５°の第１傾斜面と、該第１傾斜面に続く鋼管内
表面の垂線とのなす角度Ｂが５°〜８５°の第２傾斜面
とを有し、第１傾斜面と第２傾斜面とのなす角度Ｃを０
°〜８０°とした接合開先を形成し、他方の鋼管端部
に、前記一方の鋼管端部と隙間なく嵌合し得る如く、一
方の鋼管端部に形成した傾斜面と対応した角度Ｄ，Ｅ，
Ｆをそれぞれ有する第１傾斜面及び第２傾斜面を有する
接合開先を形成すると共に、接合時の両開先間に、厚さ
５〜３００μｍで前記開先形状に合致する形状の、液相
接合可能な非晶質金属箔を配置させて接合時の開先接触
面積を増加させ、継手全長が鋼管肉厚ｔの２ｔ〜１００
０mmであることを特徴とする接合強度の高い鋼管の液相
拡散接合用継手。1. In a joint for abutting the ends of two steel pipes against each other for liquid phase diffusion bonding, an angle A formed between the outer surface side of the steel pipe and a perpendicular to the outer surface is 5 at one end of the steel pipe.
The first inclined surface and the second inclined surface having an angle B of 5 ° to 85 ° between the first inclined surface and the perpendicular to the inner surface of the steel pipe following the first inclined surface. 2 The angle C with the inclined surface is 0
An angle D corresponding to an inclined surface formed at one steel pipe end so that a joining groove having a angle of 80 to 80 can be formed and the other steel pipe end can be fitted to the one steel pipe end without a gap. , E,
A liquid phase having a joint groove having a first inclined surface and a second inclined surface each having F and having a thickness of 5 to 300 μm and conforming to the groove shape between the both grooves at the time of joining. A jointable amorphous metal foil is arranged to increase the groove contact area at the time of joining, and the total length of the joint is from 2t to 100 of the steel pipe wall thickness t.
A joint for liquid phase diffusion bonding of steel pipes with high bonding strength, which is characterized by 0 mm.
における第１傾斜面及び第２傾斜面の間に、第３傾斜面
をそれぞれ設け、第１傾斜面と第３傾斜面とのなす角度
Ｇ，Ｉと第３傾斜面と第２傾斜面とのなす角度Ｈ，Ｊ
は、いずれも５°〜８５°としたことを特徴とする請求
項１記載の接合強度の高い鋼管の液相拡散接合用継手。2. A third inclined surface is provided between the first inclined surface and the second inclined surface at the joint groove of the two steel pipe ends to be abutted, and the first inclined surface and the third inclined surface are formed. Angles G and I and angles H and J formed by the third inclined surface and the second inclined surface
2. The joints for liquid phase diffusion bonding of steel pipes with high joint strength according to claim 1, characterized in that all are set to 5 ° to 85 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13538496A JP3419994B2 (en) | 1996-05-29 | 1996-05-29 | Joint for liquid phase diffusion joining of steel pipe with high joining strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13538496A JP3419994B2 (en) | 1996-05-29 | 1996-05-29 | Joint for liquid phase diffusion joining of steel pipe with high joining strength |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09317959A JPH09317959A (en) | 1997-12-12 |
| JP3419994B2 true JP3419994B2 (en) | 2003-06-23 |
Family
ID=15150454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13538496A Expired - Fee Related JP3419994B2 (en) | 1996-05-29 | 1996-05-29 | Joint for liquid phase diffusion joining of steel pipe with high joining strength |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3419994B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6592154B2 (en) * | 2000-05-18 | 2003-07-15 | Daido Tokushuko Kabushiki Kaisha | Metal-pipe bonded body, pipe expansion method of metal-pipe bonded body, and method for inspecting metal-pipe bonded body |
| JP4583269B2 (en) * | 2005-08-04 | 2010-11-17 | 新日本製鐵株式会社 | Manufacturing method of common rail |
| WO2011062011A1 (en) * | 2009-11-19 | 2011-05-26 | 新日本製鐵株式会社 | Common rail, common rail holder, and method for producing common rail |
| JP5375567B2 (en) * | 2009-12-04 | 2013-12-25 | 新日鐵住金株式会社 | High energy density beam welded joint with excellent fatigue resistance |
| CN102905843B (en) | 2010-01-04 | 2016-01-13 | 科卢斯博知识产权有限公司 | Amorphous alloy seal and conjunction |
| WO2013023368A1 (en) * | 2011-08-17 | 2013-02-21 | 长沙中联重工科技发展股份有限公司 | Method for welding axle housing to axle tube and structure for connecting axle housing to axle tube |
| US10065396B2 (en) | 2014-01-22 | 2018-09-04 | Crucible Intellectual Property, Llc | Amorphous metal overmolding |
| FR3040452B1 (en) * | 2015-08-24 | 2017-09-29 | Didier Sarde | SEALED COUPLING SYSTEM |
-
1996
- 1996-05-29 JP JP13538496A patent/JP3419994B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JPH09317959A (en) | 1997-12-12 |
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