JP5726549B2 - Structural materials for plug-in welded pipe fittings - Google Patents

Structural materials for plug-in welded pipe fittings Download PDF

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JP5726549B2
JP5726549B2 JP2011013095A JP2011013095A JP5726549B2 JP 5726549 B2 JP5726549 B2 JP 5726549B2 JP 2011013095 A JP2011013095 A JP 2011013095A JP 2011013095 A JP2011013095 A JP 2011013095A JP 5726549 B2 JP5726549 B2 JP 5726549B2
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socket
pipe
plug
welded
end surface
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JP2012152775A (en
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潤一郎 森澤
潤一郎 森澤
辰男 横田
辰男 横田
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Japan Atomic Power Co Ltd
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Description

本発明は、溶け込み不良の発生を低減することを可能とした差込溶接式管継手用構造材に関するものである。   The present invention relates to a structural material for insertion welded pipe joints that can reduce the occurrence of poor penetration.

ソケット溶接継手等の差込溶接式管継手は、ソケット端面(垂直面)と配管外面の交差コーナ部(直角コーナ部)を十分溶融させることによって、品質が確保される。   The quality of a plug-welded pipe joint such as a socket-welded joint is ensured by sufficiently melting the intersecting corner portion (right-angle corner portion) between the socket end surface (vertical surface) and the pipe outer surface.

ソケット溶接継手は以前から作業段取りが容易なことから多くの継手で採用されている。通常の配管の突合せ溶接では裏波を出す必要があり、溶接技術としても高度な技術・技量が要求されるが、ソケット溶接継手はそこまでの技術・技量は要求されない。   Socket welded joints have been used in many joints since work setup is easy. In ordinary butt welding of pipes, it is necessary to produce a back wave, and advanced techniques and skills are required as welding techniques, but socket welded joints do not require such techniques and skills.

図3は、良好な溶け込みが行われたソケット溶接継手の軸方向断面を示す図である。ソケット1に配管2が差し込まれ、ソケット1の端面と配管2の表面との間に溶接欠陥(溶け込み不良)がなく、すみ肉溶接部Aが形成されている。   FIG. 3 is a diagram showing an axial cross-section of a socket welded joint in which good penetration has been performed. The pipe 2 is inserted into the socket 1, and there is no welding defect (poor penetration) between the end face of the socket 1 and the surface of the pipe 2, and a fillet weld A is formed.

図4は、溶接欠陥(溶け込み不良)が生じているソケット溶接継手の軸方向断面を示す図である。ソケット1の端面と配管2の表面との間にすみ肉溶接部Bが溶接されているが、欠陥部Cが生じている。   FIG. 4 is a diagram showing an axial cross section of a socket weld joint in which a weld defect (poor penetration) occurs. The fillet weld B is welded between the end face of the socket 1 and the surface of the pipe 2, but a defect C is generated.

このような溶込み不良があると、計画通りの強度が確保されず、使用中に漏洩を起す可能性があるため、溶込み不良の発生を抑える必要がある。   If there is such a penetration failure, the planned strength is not ensured, and there is a possibility of leakage during use, so it is necessary to suppress the occurrence of the penetration failure.

溶込み不良は、一般的には放射線透過検査を行えば検出できる。しかしながら、差込溶接式管継手に放射線透過検査を使用するのであれば、簡易型継手であるこの継手を使用した効果が出ないため、突合せ溶接にして放射線透過検査を行った方が良いと考えられる。また一般的に、差込溶接式管継手に対する非破壊検査は、液体浸透探傷検査、又は、磁粉探傷検査が適用されるが、これは表面検査であるため、図4の欠陥部Cに示すような内部欠陥は検出できない。   In general, penetration defects can be detected by performing a radiographic inspection. However, if a radiation transmission test is used for a plug-in welded pipe joint, the effect of using this joint, which is a simple joint, will not be achieved, so it is better to perform a radiation transmission test using butt welding. It is done. In general, the liquid penetration inspection or the magnetic particle inspection is applied to the nondestructive inspection for the insertion welded pipe joint. Since this is a surface inspection, as shown in the defect portion C in FIG. No internal defects can be detected.

また、溶接完了後、一般的には、耐圧検査が行われるが、図4の欠陥部Cに示すような内部欠陥が小さい場合は、往々にして、耐圧検査も合格することが多い。その後、使用中に欠陥がき裂となって進展し、漏洩にいたる場合も多いと考えられる。従って、この内部欠陥を如何に発生させないように管理するかが大切となる。   In general, after the welding is completed, the pressure resistance test is performed. However, when the internal defect as shown in the defect portion C in FIG. 4 is small, the pressure resistance test is often passed. Thereafter, it is considered that defects often develop as cracks during use, leading to leakage. Therefore, it is important how to manage the internal defects so as not to occur.

図2は、従来のソケット溶接の態様を示す図である。トーチ13の先端部(タングステン電極)は、ソケット11の端面11aと配管12の外面12aが交わるコーナ部へ向けてほぼ45°の角度で進入する。   FIG. 2 is a diagram showing a conventional socket welding mode. The tip portion (tungsten electrode) of the torch 13 enters the corner portion where the end surface 11a of the socket 11 and the outer surface 12a of the pipe 12 intersect at an angle of approximately 45 °.

図中で、トーチ13の先端とソケット11の端面11aとの距離をlA´とし、トーチ13の先端と配管12の外面12aとの距離をlB´とする場合、lA´=lB´の場合には、トーチ13の先端とソケット11の端面11aと配管12の外面12aが交わるコーナ部との距離lC´は、lC´=√2lA´(または=√2lB´)となる。従って、今回の場合のlC´寸法は、lA´またはlB´の√2倍(約1.4倍)になっている。 In the figure, when the distance between the tip of the torch 13 and the end surface 11a of the socket 11 is l A ′, and the distance between the tip of the torch 13 and the outer surface 12a of the pipe 12 is l B ′, l A ′ = l B In the case of ′, the distance l C ′ between the tip of the torch 13, the end surface 11 a of the socket 11, and the corner portion where the outer surface 12 a of the pipe 12 intersects is l C ′ = √2l A ′ (or = √2l B ′). It becomes. Accordingly, the l C ′ dimension in this case is √2 times (about 1.4 times) l A ′ or l B ′.

図2において、アークの発生し易い方向(位置)は次のように想定される。まず、アークの特性として、アークの硬直性があり、電極の向いている方向へアークが出易い傾向はある。しかしながら、一般的に、アークの発生し易い方向は、電極と母材までの距離が一番小さい位置にアークが出易い傾向がある。   In FIG. 2, the direction (position) where an arc is likely to occur is assumed as follows. First, as arc characteristics, there is arc rigidity, and there is a tendency that the arc tends to be emitted in the direction in which the electrodes are facing. However, generally, the direction in which an arc is likely to occur tends to be easily generated at a position where the distance between the electrode and the base material is the smallest.

従って、ソケット11の端面11aと配管12の外面12aが交わるコーナ部へアークが発生することが好ましいが、実際にはトーチ13の先端と母材までの距離が一番小さいソケット11の端面11a及び配管12の外面12aに向かってアークが発生し易い。   Therefore, it is preferable that an arc is generated at a corner portion where the end surface 11a of the socket 11 and the outer surface 12a of the pipe 12 intersect, but actually, the end surface 11a of the socket 11 having the smallest distance from the tip of the torch 13 to the base material An arc is likely to occur toward the outer surface 12 a of the pipe 12.

通常は、溶接士の技量でカバーし、コーナ部を溶融するようトーチ13を動かし、カバーしている。しかしながら、そのカバーが不十分であると、コーナ部の溶融不良に繋がる可能性が大きいことになり、コーナ部溶着不良の欠陥に繋がる可能性がある。   Usually, it is covered with the skill of the welder, and the torch 13 is moved and covered so as to melt the corner. However, if the cover is insufficient, there is a high possibility that it will lead to poor melting of the corner portion, which may lead to a defect of poor welding at the corner portion.

本発明は、このような従来の問題を解決するためになされたもので、溶け込み不良の発生を低減することを可能とした差込溶接式管継手用構造材を提供しようとするものである。   The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a structural material for a plug-welded pipe joint that can reduce the occurrence of poor penetration.

本発明の差込溶接式管継手用構造材は、略中空円筒状の差込口に配管が差し込まれ、溶接用のトーチの先端が、差込口の端面と配管の外面とがなすコーナ部へ向けて進入してすみ肉溶接される差込溶接式管継手用構造材であって、差込口の端面は、略円錐台状の傾斜面であり、差込溶接式管継手用構造材の中心軸に垂直な断面と略円錐台状の傾斜面とがなす角度は、30°以上であることを特徴とする。 The structural material for a welded-type pipe joint according to the present invention is a corner portion in which a pipe is inserted into a substantially hollow cylindrical insertion port, and the end of the welding torch is formed by the end surface of the insertion port and the outer surface of the pipe. a plug weld type pipe joint for structural materials to be fillet welding enters toward the end face of the insertion port is substantially Ri frustoconical inclined surfaces der, plug weld type pipe joint for construction central axis angle between the cross section perpendicular the generally frustoconical shape of the inclined surface of the wood is characterized der Rukoto 30 ° or more.

本発明の差込溶接式管継手用構造材によれば、コーナ部の溶込み不足が発生し難いソケット溶接継手を提供することが可能となる。   According to the structural material for a plug-welded type pipe joint of the present invention, it is possible to provide a socket weld joint in which a lack of penetration of the corner portion is unlikely to occur.

本発明の実施形態の差込溶接式管継手用構造材の形状及びソケット溶接の態様を示す図である。It is a figure which shows the shape of the structural material for insertion welding type pipe joints of embodiment of this invention, and the aspect of socket welding. 従来のソケット溶接の態様を示す図である。It is a figure which shows the aspect of the conventional socket welding. 良好な溶け込みが行われたソケット溶接継手の軸方向断面を示す図である。It is a figure which shows the axial direction cross section of the socket welded joint in which favorable penetration was performed. 溶接欠陥(溶け込み不良)が生じているソケット溶接継手の軸方向断面を示す図である。It is a figure which shows the axial direction cross section of the socket welded joint in which the welding defect (poor penetration defect) has arisen.

以下、本発明の実施形態である差込溶接式管継手用構造材について、図を参照して詳細に説明をする。なお、以下の説明においては、ソケット溶接継手を例にあげて説明をするが、一般的な差込溶接継手等にも適用可能である。   Hereinafter, a structure material for a plug-welded pipe joint according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, a socket welded joint will be described as an example, but the present invention can also be applied to a general insertion welded joint.

図1は、本発明の実施形態の差込溶接式管継手用構造材の形状を示す図である。   Drawing 1 is a figure showing the shape of the structural material for insertion welding type pipe joints of the embodiment of the present invention.

本実施形態のソケット(差込溶接式管継手用構造材)101の略中空円筒状の差込口101bに配管102が差し込まれる構造のソケット溶接継手100において、ソケット101の端面101aは略円錐台状の傾斜面となっている。   In the socket weld joint 100 in which the pipe 102 is inserted into the substantially hollow cylindrical insertion port 101b of the socket (insertion welded pipe joint structural member) 101 of the present embodiment, the end surface 101a of the socket 101 has a substantially truncated cone. It becomes the shape inclined surface.

図1に示すように、トーチ103の先端とソケット端面101aの距離をlAとし、トーチ103の先端と配管外面102aの距離をlBとし、トーチ103の先端とコーナ部の距離をlCとする。 As shown in FIG. 1, the distance between the tip of the torch 103 and the socket end surface 101a is l A , the distance between the tip of the torch 103 and the pipe outer surface 102a is l B, and the distance between the tip of the torch 103 and the corner is l C. To do.

トーチ103の進入角度α(トーチ103の中心軸と配管外面102aとがなす角度)を60°とし、ソケット端面101aの角度β(ソケット101の中心軸に垂直な断面と略円錐台状の端面101aとがなす角度)を30°とした場合には、距離lA=距離lBとなり、lCは、lC=(2/√3)lA(約1.15倍)となり、lA、lB、及びlCは、ほとんど同じ長さになっている。従って、アークがソケット端面、配管外面、それらのコーナ部へ満遍にアークが発生し、欠陥が発生しにくくなることが判る。 An entrance angle α of the torch 103 (an angle formed between the central axis of the torch 103 and the pipe outer surface 102a) is 60 °, and an angle β of the socket end surface 101a (a cross section perpendicular to the central axis of the socket 101 and a substantially frustoconical end surface 101a). Is 30 °, the distance l A = distance l B and l C becomes l C = (2 / √3) l A (about 1.15 times), l A and l B , And l C are almost the same length. Therefore, it can be seen that the arc is generated uniformly on the socket end surface, the outer surface of the pipe, and the corners thereof, and defects are less likely to occur.

ソケット端面101aの角度βは、図上の計算的には30°以上であることが好ましいが、0°より大きな角度とすることにより、トーチ103の先端とソケット端面101aの距離をlAと、トーチ103の先端と配管外面102aの距離をlBと、トーチ103の先端とコーナ部の距離をlCとの差が少なくなるため、欠陥の発生を減少させることができる。 The angle β of the socket end surface 101a is preferably 30 ° or more in the figure, but by making the angle larger than 0 °, the distance between the tip of the torch 103 and the socket end surface 101a is l A , Since the difference between the distance between the tip of the torch 103 and the pipe outer surface 102a is 1 B and the distance between the tip of the torch 103 and the corner is 1 C , the occurrence of defects can be reduced.

以上説明したように、本実施形態のソケットによれば、ソケット継手のソケット端面を広角側に倒した略円錐台状とし、電極先端と母材間の距離をほぼ等間隔にし、ソケットコーナ部にアークが届きやすい構造にしている。これにより、アークが配管、ソケット端面及びそのコーナ部にアークが均一に出易くなり、コーナ部の溶込み不足が発生し難い。したがって、端面の欠陥が出にくくなり、継手の信頼性向上に繋がる。   As described above, according to the socket of the present embodiment, the socket end surface of the socket joint has a substantially truncated cone shape that is tilted to the wide angle side, and the distance between the electrode tip and the base material is approximately equal, so that the socket corner portion The structure is easy to reach the arc. This makes it easier for the arc to come out uniformly on the pipe, the socket end face and the corner thereof, and insufficient corner penetration is unlikely to occur. Therefore, defects on the end face are less likely to occur, leading to improved reliability of the joint.

100:ソケット溶接継手
101:ソケット(差込溶接式管継手用構造材)
102:配管

100: Socket weld joint 101: Socket (structure material for plug-in welded pipe joint)
102: Piping

Claims (1)

略中空円筒状の差込口に配管が差し込まれ、溶接用のトーチの先端が、前記差込口の端面と前記配管の外面とがなすコーナ部へ向けて進入してすみ肉溶接される差込溶接式管継手用構造材であって、
前記差込口の端面は、略円錐台状の傾斜面であり、
前記差込溶接式管継手用構造材の中心軸に垂直な断面と前記略円錐台状の傾斜面とがなす角度は、30°以上であることを特徴とする差込溶接式管継手用構造材。
The pipe is inserted into the substantially hollow cylindrical insertion port, and the tip of the welding torch enters the corner portion formed by the end surface of the insertion port and the outer surface of the pipe and is fillet welded. It is a structural material for buried welded pipe joints,
The end surface of the insertion port, Ri substantially frustoconical inclined surfaces der,
Angle between a section perpendicular the generally frustoconical inclined surface to the central axis of the plug weld type pipe joint for construction materials, for plug welding type pipe joint according to claim der Rukoto least 30 ° Structural material.
JP2011013095A 2011-01-25 2011-01-25 Structural materials for plug-in welded pipe fittings Active JP5726549B2 (en)

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Publication number Priority date Publication date Assignee Title
JPS5666398A (en) * 1979-11-01 1981-06-04 Hitachi Ltd Pipe connection method and device
JPH0287592U (en) * 1988-12-23 1990-07-11
JP2010005658A (en) * 2008-06-26 2010-01-14 Japan Atom Power Co Ltd:The Structural member for slip-on type weld pipe-fitting

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