JPS5922631B2 - Automatic butt welding method for diagonally cut pipes - Google Patents

Description

【発明の詳細な説明】 この発明は、石油、ガス、水道、下水処理プラント等の
配管工事あるいは構造物等の管接合工事において、斜め
切断された鋼管を他の鋼管と突合せて自動溶接する方法
に関するものである。[Detailed Description of the Invention] This invention is a method for automatically welding diagonally cut steel pipes against other steel pipes in piping work for oil, gas, water supply, sewage treatment plants, etc. or pipe joining work for structures, etc. It is related to.

鋼管の溶接接合工事においては、管軸に直角な管端相互
の溶接だけでなく、管端に対し傾斜した端面を有する鋼
管すなわち斜め切断管の溶接も必要であり、特に都市近
郊の都市ガス配管工事においては、配管工事現場で鋼管
を斜め切断して突合５ せ溶接する斜め継手が相当量あ
る。このため配管工事に当たり、直角切断管および斜め
切断管の何れも自動化が可能である溶接方法が要望され
ている。また溶接工事現場は狭くかつ足場も悪く、しか
１０も管接合部の位置は埋設溝の底面、または足場を必
要とするような地表面から高い位置にあるので作業環境
が悪く、さらに溶接作業位置の移行が前提となるため、
施工装置は小型、軽量でかつ人力により容易に移送およ
び取扱いできることが重要１５である。In welding and joining steel pipes, it is necessary not only to weld the ends of the pipes perpendicular to the pipe axis, but also to weld diagonally cut pipes that have end faces inclined to the pipe ends, especially for city gas piping in suburban areas. In construction work, there are a considerable number of diagonal joints in which steel pipes are cut diagonally and butt welded at piping construction sites. For this reason, there is a need for a welding method that can automate both right-angle cut pipes and diagonally cut pipes in piping work. In addition, the welding work site is narrow and the footing is poor, and the work environment is poor because the pipe joints are located at the bottom of the buried trench or at a high position from the ground surface that requires scaffolding. It is assumed that the transition of
It is important that construction equipment be small, lightweight, and easy to transport and handle by hand.

さらに現場溶接はその用途に応じて、溶接法、被溶接管
の口径、肉厚等において多種多様であるが、装置はでき
るだけ共通に使用できるものが望ましい。この発明は前
述の要望を満足する斜め切断管の２０突合せ自動溶接方
法を提供することを目的とするものである。Furthermore, although on-site welding involves a wide variety of welding methods, diameters of pipes to be welded, wall thicknesses, etc. depending on the application, it is desirable that equipment can be used as commonly as possible. The object of the present invention is to provide a method for automatic butt welding of 20 obliquely cut pipes that satisfies the above-mentioned requirements.

次にこの発明を図によつて詳細に説明する。Next, this invention will be explained in detail with reference to the drawings.

第１図はこの発明において用いられる固定具付き円形軌
道体を示すものであつて、円形軌道体１２５の周囲に、
３本の締付螺杆４が放射状に配置されて螺合され、かつ
各締付螺杆４の内端部には支持座５が任意方向に揺動自
在にかつ回動自在に取付けられ、前記締付螺杆４と支持
座５とにより固定具６が構成されている。３０第２図は
この発明の基本原理説明図であつて、斜め切断管Ｔの管
軸Ｄ−Ｅに対して傾斜角θで、かつ偏心量がＬｔａｎθ
となるように半径Ｒの円形軌道体１を、固定具により斜
め切断管Ｔの外側に固定し、次に前記円形軌道体１に、
これに沿つて走３５行できると共に円形軌道ＡＯＢを含
む平面に対して一定の開先角αで切断できるガストーチ
８または切削具を有する開先加工装置２を着脱自在に装
着し、その開先加工装置２を円形軌道体１によりガイド
しながら移動して開先加工を行なう。FIG. 1 shows a circular orbital body with fixtures used in the present invention, and around the circular orbital body 125,
Three tightening screws 4 are arranged radially and screwed together, and a support seat 5 is attached to the inner end of each tightening screw 4 so as to be swingable and rotatable in any direction. The screw rod 4 and the support seat 5 constitute a fixture 6. 30 FIG. 2 is an explanatory diagram of the basic principle of this invention, and shows that the obliquely cut tube T has an inclination angle θ with respect to the tube axis DE, and an eccentric amount Ltanθ
A circular track body 1 with a radius R is fixed to the outside of the diagonally cut pipe T using a fixture, and then to the circular track body 1,
A beveling device 2 equipped with a gas torch 8 or a cutting tool that can run 35 lines along this path and cut at a constant bevel angle α with respect to a plane including the circular orbit AOB is detachably attached, and the bevel processing Beveling is performed by moving the device 2 while being guided by the circular track body 1.

このようにして開先加工を行なつた場合、被溶接管側の
切断角はβ〜βδなり、管周位置により変化するが、同
様の開先加工を施した直管または斜角管と突合せた場合
、溶接開先角度の１／２に相当する角αは全周にわたつ
て一定である。またその突合せ面は円形軌道ＡＯＢの面
と平行な面となり、かつ溶接開先角度の２等分線上でも
ある。周知のように、自動溶接の前提条件として開先形
状（特に開先角）および開先に対する溶接トーチの入射
角，相対位置等を溶接線に沿つて一定に保つことは必須
条件であり、また走行移動につれてその倣い位置も調整
し易いことは理想である。この発明の場合は、被溶接管
を簡便な方法で斜め切断できると共に、溶接線の全周に
わたつて開先角，開先中心角を一定にでき、かつ円形軌
道体に対して倣い位置をも一定にできるので、非常に簡
便な方式と装置との組合せにより、斜め継手の自動溶接
を行なうことができる。切断面は、厳密には第１図に破
線で示すような曲面になるが、その平面変動量ａは、斜
角θが５゜程度，開先角αが実用上２『〜３『，管内半
径ｒが５０〜４００１１程度では微少値であり、溶接時
の開先許容精度内に充分納まつている。When the bevel is formed in this way, the cutting angle on the pipe to be welded is β to βδ, which varies depending on the circumferential position of the pipe, but when butted with a straight or beveled pipe that has been similarly beveled. In this case, the angle α corresponding to 1/2 of the welding groove angle is constant over the entire circumference. Further, the abutting surface is parallel to the plane of the circular orbit AOB, and is also on the bisector of the welding groove angle. As is well known, as a prerequisite for automatic welding, it is essential to keep the groove shape (particularly the groove angle), the incident angle of the welding torch with respect to the groove, the relative position, etc. constant along the welding line. Ideally, the tracing position can be easily adjusted as the vehicle travels. In the case of this invention, the pipe to be welded can be cut diagonally in a simple manner, the groove angle and the groove center angle can be made constant over the entire circumference of the weld line, and the tracing position can be adjusted with respect to the circular track body. Since the welding angle can be kept constant, it is possible to automatically weld diagonal joints by combining a very simple method and equipment. Strictly speaking, the cut surface will be a curved surface as shown by the broken line in Fig. 1, but the amount of plane variation a is such that the bevel angle θ is approximately 5° and the bevel angle α is 2'~3' in practice. When the radius r is about 50 to 40011, it is a very small value and is well within the allowable groove accuracy during welding.

また直管と接合する場合のルート面のオフセツト量ｂに
ついても上記の場合と同様に問題がない。第３図はガス
トーチ８を有する開先加工装置２により直角切断管９お
よび斜め切断管７の開先加工を行なつた状態を同一図上
に示すものであつて、斜め切断管７および直角切断管９
の外側に、それぞれ管端面を含む面に平行になるように
して、円形軌道体１を固定具６により着脱自在に取付け
、ガストーチ８を有する開先加工装置２を円形軌道体１
に装着し、その円形軌道体１によりガイドされながら移
動する開先加工装置２によつて各管端に開先加工を施す
。第４図は各々斜めに開先加工された斜め切断管７を突
合せ自動溶接している状態を示すものであつて、一方の
斜め切断管７に、溶接線を含む平面に対し平行になるよ
うにして、円形軌道体１を固着具により着脱自在に取付
け、溶接トーチ１０，溶接ワイヤ送給装置１１等を備え
ている自動溶接機３を前記円形軌道体１に装着し、その
円形軌道体１によりガイドされながら移動する自動溶接
機３によつて、斜め切断管７の管端が相互に突合せ自動
溶接される。Also, there is no problem with the amount of offset b of the root surface when it is connected to a straight pipe, as in the case described above. FIG. 3 shows a state in which a right-angle cut pipe 9 and a diagonal cut pipe 7 are beveled by the beveling device 2 having a gas torch 8. tube 9
A circular raceway body 1 is removably attached to the outside of the circular raceway body 1 using a fixture 6 so as to be parallel to the plane including the tube end surface, and a beveling device 2 having a gas torch 8 is attached to the circular raceway body 1.
A beveling device 2, which moves while being guided by the circular track body 1, bevels each tube end. FIG. 4 shows a state in which two diagonally cut pipes 7 each having a beveled surface are butt-welded automatically. Then, the circular orbital body 1 is removably attached using a fixing tool, and the automatic welding machine 3 equipped with a welding torch 10, welding wire feeding device 11, etc. is attached to the circular orbital body 1, and the circular orbital body 1 is attached. The ends of the diagonally cut tubes 7 are butted together and automatically welded by the automatic welding machine 3, which moves while being guided by the welding machine 3.

このように斜め切断管７を相互に突合せ溶接する場合は
、管端傾斜角θの２倍の折れ曲り継手とすることができ
る。なお開先加工装置および自動溶接機は円形軌道体に
対し管軸方向および管半径方向に移動しないように装着
されるが、その装着構造は公知であるので、その説明を
省略する。When the diagonally cut pipes 7 are butt-welded to each other in this way, a bent joint can be formed with twice the pipe end inclination angle θ. Note that the beveling device and the automatic welding machine are mounted on the circular track body so as not to move in the tube axis direction and the tube radial direction, but the mounting structure thereof is well known, so a description thereof will be omitted.

この発明を実施する場合、１つの案内軌道体を開先加工
および自動溶接に兼用してもよく、また開先加工および
自動溶接に別個の案内軌道体を使用してもよい。When carrying out the invention, one guide track may be used for both groove preparation and automatic welding, or separate guide tracks may be used for groove preparation and automatic welding.

さらにまた、溶接機のヘツド数は１個でもよく複数個で
もよい。なおこの発明は、口径１００１ＲＵ〜７００１
！ｌφ程度の鋼管の斜め突合せ自動溶接に適しており、
管の姿勢は水平，傾斜，垂直の何れであつてもよい。Furthermore, the number of heads of the welding machine may be one or more. Note that this invention applies to diameters of 1001RU to 7001RU
! Suitable for automatic diagonal butt welding of steel pipes of about lφ.
The orientation of the tube may be horizontal, inclined, or vertical.

また開先の形状はＶ，Ｕ，多面の何れであつてもよい。
さらに溶接法もＭＩＧ，ＴＩＧ，ノンガス法を同様の原
理で用いることができる。この発明によれば、少なくと
も一方が斜め切断管である被溶接管の外側に、それぞれ
管端面を含む平面に平行になるようにして円形軌道体を
取付けたのち、その円形軌道体１に沿つて一定角αにな
るように切断ノズルを配置した開先加工装置２を移動さ
せて管端に開先加工を施し、次に溶接線を含む平面に対
し平行になるように被溶接管に取付けられている円形軌
道体に沿つて自動溶接機３を移動させながら溶接を行な
うので、任意の傾斜角の管端に対し工事現場において容
易にかつ正確に開先加工を施すことができ、しかも少な
くとも一方が斜め切断管である被溶接管を、円形軌道体
によつてガイドされながら移動される自動溶接機により
正確に自動溶接することができ、そのため斜め切断管の
接合すなわち管屈折接合を含む配管工事において、全溶
接作業を自動化することができ、したがつて手溶接と自
動溶接とを併用していた従来の場合に比べて、人件費を
少なくしてコストダウンを計ることができると共に、溶
接の品質管理を向上させることができ、さらに溶接施工
法および検査基準等の統一化が容易になる。Further, the shape of the groove may be V, U, or multifaceted.
Furthermore, MIG, TIG, and non-gas welding methods can be used based on the same principle. According to this invention, the circular raceway bodies are attached to the outside of the pipe to be welded, at least one of which is an obliquely cut pipe, so as to be parallel to the plane including the pipe end face, and then the circular raceway bodies 1 are attached to the outside of the pipe to be welded, at least one of which is an obliquely cut pipe. The beveling device 2, which has a cutting nozzle arranged at a constant angle α, is moved to create a beveling at the tube end, and then attached to the pipe to be welded so as to be parallel to the plane containing the weld line. Since welding is carried out while moving the automatic welding machine 3 along the circular track body, it is possible to easily and accurately perform beveling on the pipe end at any angle of inclination at the construction site. The pipe to be welded, which is a diagonally cut pipe, can be precisely and automatically welded by an automatic welding machine that moves while being guided by a circular track body. Therefore, piping work including joining of diagonally cut pipes, that is, pipe bending joints. , all welding work can be automated, and therefore, compared to the conventional case where manual welding and automatic welding are used together, labor costs can be reduced and costs can be reduced, and welding Quality control can be improved, and it becomes easier to unify welding methods, inspection standards, etc.

また小型，軽量で取扱いも簡便でしかも安価である固定
具付き円形軌道体を補助具として使用して、正確な開先
加と自動溶接とを行なうことができ、大規模，高価格，
高精密な装置を用いることなく、斜め切断管の突合せ溶
接を自動化できるので実用的に非常に有効であり、さら
に管の口径変化に対しては、案内軌道を交換するだけで
容易に対応することができる等の効果が得られる。In addition, by using a small, lightweight, easy-to-handle, and inexpensive circular track body with a fixture as an auxiliary tool, accurate beveling and automatic welding can be performed.
It is very effective in practice because it can automate butt welding of diagonally cut pipes without using high-precision equipment, and it is also possible to easily respond to changes in the diameter of the pipe by simply replacing the guide track. Effects such as being able to do this can be obtained.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの発明において用いられる固定具付き円形軌
道体の一部縦断正面図、第２図はこの発明の基本原理説
明図、第３図は開先加工を行なつている状態を示す縦断
側面図、第４図は斜め切断管の突合せ自動溶接を行なつ
ている状態を示す縦断側面図である。 図において、１は円形軌道体、２は開先加工装置、３は
自動溶接機、４は締付螺杆、５は支持座、６は固定具、
７は斜め切断管、８はガストーチ、９は直角切断管、１
０は溶接トーチ、１１は溶接ワイヤ送給装置である。Fig. 1 is a partially longitudinal front view of a circular raceway body with a fixing device used in the present invention, Fig. 2 is an explanatory diagram of the basic principle of this invention, and Fig. 3 is a longitudinal cross-sectional view showing a state in which a beveling is being performed. FIG. 4 is a longitudinal sectional side view showing a state in which automatic butt welding of obliquely cut pipes is being performed. In the figure, 1 is a circular orbital body, 2 is a beveling device, 3 is an automatic welding machine, 4 is a tightening screw, 5 is a support seat, 6 is a fixture,
7 is a diagonally cut pipe, 8 is a gas torch, 9 is a right angle cut pipe, 1
0 is a welding torch, and 11 is a welding wire feeding device.

Claims (1)

【特許請求の範囲】[Claims] １ 溶接線を含む平面が少なくとも一方の被溶接管の管
軸に対して傾斜している斜め切断管を突合せ溶接するに
際し、各被溶接管の外側に、それぞれ管端面を含む平面
に平行になるようにして円形軌道体１を着脱自在に取付
けたのち、その円形軌道体１に沿つて一定角αになるよ
うに切断ノズルを配置した開先加工装置２を移動させて
管端に開先加工を施し、次に溶接線を含む平面に対し平
行になるように被溶接管に取付けられている円形軌道体
に沿つて自動溶接機３を移動させながら溶接を行なうこ
とを特徴とする斜め切断管の突合せ自動溶接方法。1. When butt welding diagonally cut pipes whose plane including the weld line is inclined with respect to the pipe axis of at least one pipe to be welded, welding lines on the outside of each pipe to be welded are parallel to the plane including the pipe end face. After removably attaching the circular raceway body 1 in this manner, the beveling device 2 with the cutting nozzle arranged at a constant angle α is moved along the circular raceway body 1 to form a beveling at the tube end. and then welding is carried out by moving an automatic welding machine 3 along a circular track body attached to the pipe to be welded so as to be parallel to a plane containing the weld line. Butt automatic welding method.