JPH0429471B2 - - Google Patents
Info
- Publication number
- JPH0429471B2 JPH0429471B2 JP28128484A JP28128484A JPH0429471B2 JP H0429471 B2 JPH0429471 B2 JP H0429471B2 JP 28128484 A JP28128484 A JP 28128484A JP 28128484 A JP28128484 A JP 28128484A JP H0429471 B2 JPH0429471 B2 JP H0429471B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- pipe
- welding torch
- abutting portion
- circumferential direction
- 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
Links
- 238000003466 welding Methods 0.000 claims description 93
- 238000000034 method Methods 0.000 claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 239000011324 bead Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 6
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 241000283086 Equidae Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
Description
〔産業上の利用分野〕
本発明は大径鋼管の管端突き合せ部を内面側よ
り自動溶接する方法に関し、更に詳述すれば裏当
金として突き合せ部の外面に着脱自在に、また、
水冷可能になしてある銅製の当金を使用し、ま
た、突き合せ部内表面を溶接する溶接トーチの管
内表面に対する離隔距離等の溶接条件を、該突き
合せ部の周方向位置に応じて変更することとし
て、溶接仕上り品質の向上が図れ、また、能率の
良い溶接が行なえる自動溶接方法を提案するもの
である。
〔従来技術〕
管径2000mm程度の大径のパイプラインの建設
は、開先加工を施した管端を相互に突き合せ、そ
の突き合せ部を、該突き合せ部の内表面に沿うよ
うに周回移動可能になした溶接トーチにて溶接ト
ーチすることにより行われる。そして、このよう
な溶接方法としては第5図に部分縦断面図を、ま
た、第6図に部分横断面図を示す方法が公知であ
る。
第5図に示すように開先角度が約30゜となるよ
うに、内面側に開先加工を施してなる鋼板101
と鋼板102とを突き合せてなる突き合せ部の外
周には、共金溶接を行なうべく鋼製の裏当金31
を全周に亘つて溶着し、また、裏当金31の外周
には冷却用の銅板32を外嵌固定してある。
管内には図示しない自動溶接機を設置してあ
り、開先加工部には該自動溶接機の溶接トーチ2
01をその周方向への移動可能に臨ませてある。
そして、作業者が溶接トーチ201の位置、つま
り、第5図に示すように溶接トーチ201の先
端、具体的には後述するようにこれに挿通したワ
イヤの先端〜管内表面間距離a及びトーチ角度α
(アーク入射角であつて、具体的には第6図に示
すように管内表面の法線に対する溶接トーチ20
1の火口先201aの軸心の管周方向における傾
き角度α)を、突き合せ部の周方向位置に応じて
変更しつつ、溶接トーチ201を管内面の全周に
亘つて移動させることにより溶接を行なう方法で
あつた。
〔発明が解決しようとする問題点〕
ところで、叙上の如き従来方法にあつては、裏
当金31を突き合せ部に隅肉溶接する作業が必要
であり、また、この溶接作業を行なう場合には、
これに先立つて両管101,102の芯合せ作業
を行なう必要がある。
しかしながら、従来方法にあつては第5図に示
すようにルートギヤツプ(開先加工部の底部の間
隔)が約8mm程度であつたため、両者101,1
02の芯合せ作業は両管101,102の管軸方
向の位置決めをした後、コの字状の“馬”を、そ
の脚を両管101,102に跨らせた状態で仮溶
接することにより行なつていた。このため、突き
合せ部の本来の溶接に先立つて、上記仮溶接及び
隅肉溶接が必要となり、また、突き合せ部の溶接
後“馬”を取外す必要があるため、これらに多大
の時間を費やす結果、能率のよい溶接を行なうこ
とができないという難点があつた。
また、裏当金31は突き合せ部の溶接中に溶融
し、突き合せ部の外表面に大きな凸部を形成して
残存し、溶接仕上り品質を劣化するという欠点も
あつた。
〔問題点を解決するための手段〕
本発明は斯かる事情に鑑みてなされたものであ
り、裏波ビードのための溝を管側に、また、水冷
可能にしてある銅製の当金を、管端突き合せ部の
外面に、着脱可能に装着することにより、滑らか
な裏波ビードが形成できて、溶接仕上り品質に優
れ、また、能率のよい溶接が行なえる自動溶接方
法を提供することを目的とする。
本発明に係る自動溶接方法は、大径鋼管の管端
を相互に突き合せ、この突き合せ部の外面に当金
を装着し、その内表面に沿うようにして周回移動
可能になしてある溶接トーチを用いて該突き合せ
部を自動溶接する方法において、2つの大径鋼管
を芯合せして突き合せ、仮溶接し、裏波ビードの
ための溝を管側に形成してあり、また、水冷可能
にしてある銅製の当金を着脱可能にその突き合せ
部に外嵌固着し、突き合せ部の周方向位置に応じ
て、前記溶接トーチ先端の管内表面に対する距離
及び該溶接トーチの管内表面の法線に対する管周
方向の傾き角度を変更しつつ、突き合せ部を溶接
することを特徴とする。
〔実施例〕
以下本発明をその実施例を示す図面に基づいて
詳述する。第1図は本発明に係る自動溶接方法の
実施状態を示す正面図、第2図は第1図で示す溶
接ヘツド15周りの拡大図、第3図は当金3の拡大
縦断面図である。
管端部同士を相互に突き合せ溶接して延設し
た、直径2000mm程度の既溶接着1の未溶接側端面
には同径の未溶接管2を芯合せして、突き合せ、
この突き合せ部の開先内の適所にて仮溶接して両
者を連結してある。既溶接管1及び未溶接管2
夫々の突き合せ部には内面側に開先加工を施して
あり、突き合せ部における開先角度は約50゜とな
るように定め、また、両管1,2のルートギヤツ
プは0mmを目標とし、また、端面の平坦度の加工
精度を考慮して+3mm程度の公差を許容してあ
る。
突き合せ部の外周には適幅、適厚の1対の半円
環状の当金3,3を、夫々の周方向端部に形成し
た凸状の係止片3c,3c…間を1対のレバーブ
ロツク4,4を用いて緊締することにより、両管
1,2の突き合せ部に跨らせて外嵌固定してあ
り、レバーブロツク4,4の緊締を解除すると当
金3,3を突き合せ部から容易に離脱させ得るよ
うになつている。
当金3は第3図にその断面形状を示すように、
半円環状の銅板3aの外面に断面凹状の銅製の半
円環状部材3bの開口端を溶着したものであり、
その断面の略中央には角穴3dが形成される。角
穴3dの当金3の周方向両端部は閉塞されてい
る。銅板3aの内面中央には裏波ビードの形状を
滑らかな形状とし、また、仮溶接スポツトを位置
させるべく内面側に曲率中心を有する曲面溝3e
をその周方向の全長に亘つて形成してある。
当金3の周方向両端部の外面側には筒状の給、
排水ホース連結部5,6を夫々取付けてあり、そ
の穴は前記角穴3dに連通している。給水ホース
連結部5及び排水ホース連結部6には夫々給水ホ
ース5a、排水ホース6aの一端部を連結してあ
る。給水ホース5aの他端部は図示しない水ポン
プの吐出側に接続してあり、また排水ポンプ6a
の他端部は冷却水タンクに接続してあり、水ポン
プの駆動により角穴3d内には冷却水7が循環供
給されるようになつている。これにより当金3の
冷却が行なえる。
管内には管内表面に臨ませて溶接ヘツド15を
設けてある。溶接ヘツド15は管内に固定した固
定脚(図示せず)により管中心回りに周回可能に
支持されている。
溶接ヘツド15の管周方向の一側端部には該溶
接ヘツド15駆動用の電動機17を装備してあ
る。電動機17は管外に設けた駆動制御装置(図
示せず)からの信号により駆動され、ギヤ機構1
8を介してその駆動力を、溶接ヘツド15の管周
方向の一側端部寄りの位置に、管内表面上を周方
向に転動可能に取付けてある溶接ヘツド駆動輪1
9に伝達できるようになつている。これにより電
動機17が駆動されると、駆動輪19が管内表面
上を転動し、溶接ヘツド15が管中心回りに周回
移動することになる。なお、ギヤ機構18のギヤ
比により溶接ヘツド15を第1図中に矢符で示す
上昇方向に回動せしめた後、電動機17を停止せ
しめる場合でも溶接ヘツド15が下降方向に回動
する虞れはない。
なお、このような溶接ヘツド15の周回移動
は、管内表面上に同心状に環状ラツクを設け、前
記電動機17に連結したピニオンの駆動により行
うこととしてもよい。
溶接ヘツド15の駆動輪19取付位置と管周方
向が略同様の管内表面側には、該管内表面に沿わ
せるようにしてカツパシユー11を取付けてあ
る。カツパシユー11は溶接ヘツド15の移動に
伴い管内表面上を摺動する。
溶接ヘツド15の管周方向の他側端寄りの位置
には第2図に示すように管内表面の法線29に対
して、その先端に位置する火口先21aの軸心を
所定角度αだけ傾斜させて溶接トーチ21を取付
けてあり、また、溶接ヘツド15の管周方向の他
側端には、突き合せ部の開先加工面上を転動可能
にして、管周方向に適長離隔させた1対の倣いロ
ーラ20,20を取付けてある。溶接トーチ21
は第2図に示すように前記法線29側に湾曲した
形状となつており、その内部にはワイヤ21bを
適長突出させて挿通してある。
溶接トーチ21の傾き角度α及び溶接トーチ2
1の先端、具体的にはワイヤ21bの先端〜管内
表面間距離aは調整可能になつている。第2図に
示すように溶接ヘツド15の管周方向の中央部か
ら前記他側端にかけて前記駆動輪19側に湾曲し
てなるガイドレール23を取付けてある。ガイド
レール23の曲率中心はワイヤ21bの先端に一
致している。ガイドレール23には、その内部に
溶接トーチ21を支持するホルダ24を、該ホル
ダ24に装備した上ガイドローラ22a,22
a、下ガイドローラ22b間に挾むようにして装
着してある。ガイドローラ22a,22a,22
bはガイドレール23に沿つて転動可能になつて
おり、該ガイドローラ22a,22a,22bを
転動させることによりホルダ24の装着位置、つ
まり溶接トーチ21の前記傾き角度αを調整でき
るようになつている。
この調整は溶接ヘツド15の管内表面と反対側
の位置に設けた摘子25を回転し、連結部材26
を介して一端側をこれに連結してあり、また他端
を前記ホルダ24に螺合してある螺杆28を螺条
送りし、ホルダ24をガイドレール23に沿つて
移動させることにより行われる。なお、前述した
如くガイドレール24の曲率中心とワイヤ21b
の先端が一致しているため、この調整の間距離a
は不変である。
次に距離aの調節について説明する。ガイドレ
ール24の溶接ヘツド15の管周方向の中央部側
端部はガイドレール支持部材40に取付けてあ
る。ガイドレール支持部材40はこれに螺合させ
てある螺杆41を螺条送りすることにより、管内
表面に対して接離可能になつており、この送り量
を調整することにより距離aの調整が行なえる。
倣いローラ20,20は電動機17の駆動によ
り管内表面上を周回移動する溶接ヘツド15、つ
まり溶接トーチ21の管軸方向の開先倣いを行
い、これにより溶接トーチ21は開先加工部を正
確に溶接し、前記カツパシユー11の移動方向前
端部に溶接池を形成する。
次に本発明方法を実施する場合の手順について
詳しく説明する。未溶接管2をクレーンにて吊支
し、敷設してある既溶接管1と芯合せを行つて、
両管1,2の管端部を突き合せる。次いで、この
突き合せ部の開先内の適所を手溶接にて溶接し、
両管1,2を仮付けする。次に上述した如く1対
の当金3,3をレバーブロツク4,4を緊締する
ことにより突き合せ部外面に固定し、その後水ポ
ンプにて当金3,3内に冷却水7を循環させる。
次いで、管内に溶接ヘツド15を設置し、第5図
に示す管内面の周方向位置夫々について、第1表
に示す溶接条件に従つて溶接を実行する。第5図
は管内面の周方向位置を時計の時刻で示す略示正
面図であり、左右対称であるので右側半分は省略
している。第1表は溶接トーチ21が管周方向の
溶接位置に占位したときの溶接条件(距離a、傾
き角度α、開先形状、溶接電圧、溶接電流)を従
来方法のそれとを対比して示す表である。但し、
溶接条件は管周方向の左右対称位置については同
様であり、右側半分については省略する。また、
溶接対象の鋼管の寸法は直径2000mm、肉厚20mmで
ある。
[Industrial Application Field] The present invention relates to a method for automatically welding the abutting portions of large-diameter steel pipes from the inner surface, and more specifically, the present invention relates to a method for automatically welding the abutting portions of large-diameter steel pipes from the inner surface.
A water-coolable copper dowel is used, and welding conditions such as the separation distance from the pipe inner surface of the welding torch used to weld the inner surface of the butt part are changed depending on the circumferential position of the butt part. In particular, we propose an automatic welding method that can improve the quality of welding finish and perform efficient welding. [Prior art] In the construction of large-diameter pipelines with a pipe diameter of approximately 2000 mm, beveled pipe ends are butted against each other, and the butted portion is circumferentially routed along the inner surface of the butted portion. This is done by using a movable welding torch. As such a welding method, a method shown in a partial vertical cross-sectional view in FIG. 5 and a partial cross-sectional view in FIG. 6 is known. As shown in FIG. 5, a steel plate 101 is formed by groove-processing the inner surface so that the groove angle is approximately 30°.
A steel backing metal 31 is placed on the outer periphery of the abutted portion where the steel plate 102 and the steel plate 102 are butted together to perform metal welding.
is welded to the entire circumference, and a cooling copper plate 32 is fitted and fixed on the outer periphery of the backing metal 31. An automatic welding machine (not shown) is installed inside the pipe, and a welding torch 2 of the automatic welding machine is installed at the beveling part.
01 is faced so that it can be moved in the circumferential direction.
Then, the operator determines the position of the welding torch 201, that is, the distance a between the tip of the welding torch 201 as shown in FIG. α
(Arc incident angle, specifically the welding torch 20 relative to the normal to the inner surface of the pipe as shown in FIG.
Welding is carried out by moving the welding torch 201 all around the inner surface of the tube while changing the inclination angle α) of the axis of the nozzle tip 201a in the circumferential direction according to the circumferential position of the abutting portion. It was a method of doing this. [Problems to be Solved by the Invention] Incidentally, in the conventional method as described above, it is necessary to perform fillet welding of the backing metal 31 to the butt portion, and when performing this welding work, for,
Prior to this, it is necessary to align the two tubes 101 and 102. However, in the conventional method, as shown in Fig. 5, the root gap (distance between the bottoms of the beveled parts) was about 8 mm, so both
02 alignment work involves positioning both pipes 101 and 102 in the pipe axis direction, and then temporarily welding a U-shaped "horse" with its legs straddling both pipes 101 and 102. It was carried out by For this reason, the above-mentioned temporary welding and fillet welding are required before the actual welding of the butt parts, and the "horse" needs to be removed after welding the butt parts, which requires a lot of time. As a result, there was a problem in that efficient welding could not be performed. In addition, the backing metal 31 melts during welding of the abutted portions and remains as a large convex portion on the outer surface of the abutted portions, deteriorating the quality of the weld finish. [Means for Solving the Problems] The present invention has been made in view of the above circumstances, and includes a groove for the Uranami bead on the pipe side, and a copper stopper that can be cooled by water. To provide an automatic welding method that is removably attached to the outer surface of a pipe end abutting part to form a smooth uranami bead, has excellent welding finish quality, and can perform efficient welding. purpose. The automatic welding method according to the present invention involves a welding process in which the pipe ends of large-diameter steel pipes are abutted against each other, and a stopper is attached to the outer surface of the abutted portion, so that it can be moved around the inner surface of the abutment. In the method of automatically welding the abutting portion using a torch, two large diameter steel pipes are aligned and butted, temporarily welded, and a groove for the uranami bead is formed on the pipe side, and A water-coolable copper stopper is removably fixed to the abutting portion, and the distance of the tip of the welding torch to the inner surface of the pipe and the inner surface of the welding torch are adjusted according to the circumferential position of the abutting portion. The abutting portion is welded while changing the inclination angle in the tube circumferential direction with respect to the normal line. [Examples] The present invention will be described in detail below based on drawings showing examples thereof. FIG. 1 is a front view showing the implementation state of the automatic welding method according to the present invention, FIG. 2 is an enlarged view of the area around the welding head 15 shown in FIG. 1, and FIG. . The unwelded pipe 2 of the same diameter is aligned with the unwelded side end face of the already welded joint 1 with a diameter of about 2000 mm, which is extended by butt welding the pipe ends to each other, and the pipes are butted together.
The two are connected by temporary welding at appropriate locations within the groove of this abutting portion. Welded pipe 1 and unwelded pipe 2
Each abutting part is beveled on the inner surface side, and the bevel angle at the abutting part is set to be approximately 50°, and the root gap of both pipes 1 and 2 is targeted to be 0 mm. Further, in consideration of the machining accuracy of the flatness of the end face, a tolerance of about +3 mm is allowed. A pair of semi-circular butts 3, 3 of appropriate width and thickness are placed on the outer periphery of the abutting portion, and a pair of convex locking pieces 3c, 3c formed at the respective circumferential ends are provided between the two. By tightening using the lever blocks 4, 4, it is fitted and fixed externally across the abutting portion of both the pipes 1, 2, and when the lever blocks 4, 4 are released, the fittings 3, 3 are tightened. can be easily removed from the abutting portion. As the cross-sectional shape of the deposit 3 is shown in Fig. 3,
The open end of a copper semicircular member 3b having a concave cross section is welded to the outer surface of a semicircular copper plate 3a,
A square hole 3d is formed approximately in the center of the cross section. Both ends in the circumferential direction of the stopper 3 in the square hole 3d are closed. At the center of the inner surface of the copper plate 3a, a curved groove 3e with a center of curvature is formed on the inner surface in order to have a smooth Uranami bead and to position a temporary welding spot.
is formed over its entire circumferential length. A cylindrical feeder is provided on the outer surface side of both ends in the circumferential direction of the stopper 3.
Drain hose connection parts 5 and 6 are attached, and the holes communicate with the square hole 3d. One end portions of a water supply hose 5a and a drainage hose 6a are connected to the water supply hose connection portion 5 and the drainage hose connection portion 6, respectively. The other end of the water supply hose 5a is connected to the discharge side of a water pump (not shown), and is also connected to a drain pump 6a.
The other end is connected to a cooling water tank, and cooling water 7 is circulated and supplied into the square hole 3d by driving a water pump. This allows the money 3 to be cooled. A welding head 15 is provided inside the pipe so as to face the inner surface of the pipe. The welding head 15 is supported by fixed legs (not shown) fixed within the tube so that it can rotate around the center of the tube. An electric motor 17 for driving the welding head 15 is installed at one end of the welding head 15 in the circumferential direction. The electric motor 17 is driven by a signal from a drive control device (not shown) provided outside the tube, and the gear mechanism 1
8, the driving force is applied to a welding head drive wheel 1 mounted at a position near one end of the welding head 15 in the circumferential direction so as to be able to roll in the circumferential direction on the inner surface of the tube.
It is now possible to transmit to 9. When the electric motor 17 is thereby driven, the drive wheel 19 rolls on the inner surface of the pipe, and the welding head 15 moves around the center of the pipe. Note that even when the electric motor 17 is stopped after the welding head 15 has been rotated in the upward direction indicated by the arrow in FIG. There isn't. Note that such circular movement of the welding head 15 may be performed by providing an annular rack concentrically on the inner surface of the pipe and driving a pinion connected to the electric motor 17. On the inner surface of the tube, which is substantially the same circumferentially as the mounting position of the driving wheel 19 of the welding head 15, a cutter shoe 11 is attached along the inner surface of the tube. The cutoff shoe 11 slides on the inner surface of the pipe as the welding head 15 moves. At a position near the other end of the welding head 15 in the circumferential direction of the tube, as shown in FIG. A welding torch 21 is attached to the other end of the welding head 15 in the circumferential direction, and the welding head 15 is made to be able to roll on the grooved surface of the abutting portion and is spaced an appropriate distance apart in the circumferential direction. A pair of copying rollers 20, 20 are attached. welding torch 21
As shown in FIG. 2, the wire 21b is curved toward the normal line 29, and a wire 21b is inserted through the wire 21b with an appropriate length projected therein. Inclination angle α of welding torch 21 and welding torch 2
1, specifically, the distance a between the tip of the wire 21b and the inner surface of the tube is adjustable. As shown in FIG. 2, a guide rail 23 is installed extending from the center of the welding head 15 in the circumferential direction to the other end and curved toward the drive wheel 19. The center of curvature of the guide rail 23 coincides with the tip of the wire 21b. The guide rail 23 includes a holder 24 that supports the welding torch 21 therein, and upper guide rollers 22a and 22 equipped with the holder 24.
a, it is mounted so as to be sandwiched between the lower guide rollers 22b. Guide rollers 22a, 22a, 22
b can roll along a guide rail 23, and by rolling the guide rollers 22a, 22a, 22b, the mounting position of the holder 24, that is, the tilt angle α of the welding torch 21 can be adjusted. It's summery. This adjustment is made by rotating the knob 25 provided on the opposite side of the pipe inner surface of the welding head 15, and
This is carried out by threading a threaded rod 28, which is connected at one end to the holder 24 through a thread and whose other end is screwed to the holder 24, to move the holder 24 along the guide rail 23. In addition, as mentioned above, the center of curvature of the guide rail 24 and the wire 21b
Since the tips of the two coincide with each other, the distance a during this adjustment
remains unchanged. Next, the adjustment of the distance a will be explained. An end portion of the guide rail 24 on the side of the center portion in the circumferential direction of the welding head 15 is attached to a guide rail support member 40 . The guide rail support member 40 can be moved toward and away from the inner surface of the pipe by threading a threaded rod 41 that is threaded thereon, and the distance a can be adjusted by adjusting the amount of feed. Ru. The copying rollers 20, 20 copy the groove in the tube axis direction of the welding head 15, that is, the welding torch 21, which moves around on the inner surface of the tube by the drive of the electric motor 17, so that the welding torch 21 accurately forms the grooved part. Welding is performed to form a weld pool at the front end of the cutlet 11 in the moving direction. Next, the procedure for carrying out the method of the present invention will be explained in detail. The unwelded pipe 2 is suspended by a crane and aligned with the already installed welded pipe 1,
The ends of both tubes 1 and 2 are butted against each other. Next, weld the appropriate places within the groove of this butt part by manual welding,
Temporarily attach both pipes 1 and 2. Next, as described above, the pair of pads 3, 3 are fixed to the outer surface of the abutting portion by tightening the lever blocks 4, 4, and then the cooling water 7 is circulated inside the pads 3, 3 using a water pump. .
Next, the welding head 15 is installed inside the tube, and welding is performed at each circumferential position on the inner surface of the tube shown in FIG. 5 according to the welding conditions shown in Table 1. FIG. 5 is a schematic front view showing the circumferential position of the inner surface of the tube in terms of clock time, and since the tube is symmetrical, the right half is omitted. Table 1 shows the welding conditions (distance a, inclination angle α, groove shape, welding voltage, welding current) when the welding torch 21 is located at the welding position in the circumferential direction of the pipe in comparison with those of the conventional method. It is a table. however,
The welding conditions are the same for the left-right symmetrical positions in the tube circumferential direction, and the right half is omitted. Also,
The steel pipe to be welded has a diameter of 2000 mm and a wall thickness of 20 mm.
次に実施例に基づき本発明の効果を第2表によ
り説明する。第2表は本発明方法により管径2000
mm、肉厚14mm〜29mmの既溶接管、未溶接管の溶接
を行つた場合の、溶接部を撮像し、その仕上り品
質をX線3級フイルムにより検査した結果を示す
表である。
Next, the effects of the present invention will be explained with reference to Table 2 based on Examples. Table 2 shows pipe diameter 2000 obtained by the method of the present invention.
Fig. 2 is a table showing the results of welding of welded pipes and unwelded pipes with a wall thickness of 14 mm to 29 mm, images of welded parts were taken, and the quality of the finished product was inspected using grade 3 X-ray film.
【表】
第2表より本発明方法による場合は仕上り品質
の合格率が高く、良好な結果が得られた。
また、本発明方法による場合は、芯合せ作業が
迅速に行なえ、また、ビード研磨に要する時間が
短縮できること等により、作業能率を従来方法に
よる場合よりも約14%向上せしめることができる
ことを確認できた。
以上の如き本発明方法による場合は、滑らかな
形状の裏波ビードを形成すべき曲面溝を備え、ま
た、水冷可能にしてある銅製の当金を管端突き合
せ部の外面に着脱自在に固定し、予め実験により
求めた溶接条件に従い管端突き合せ部を溶接する
ものであるので、能率のよい溶接が行え、また、
良好な溶接仕上り品質を得ることができる。
また、叙上の如き実施例による場合は、ルート
ギヤツプを実質的に0にして、既溶接管と未溶接
管とを突き合せ、この突き合せ部の開先内を仮溶
接することにより両管を芯合せ状態で連結するも
のであるので、両管の管軸方向の位置決めが容易
に行え、また、従来方法の如き“馬”付けを要せ
ず芯合せ作業が迅速に行え、更に一層溶接作業全
体の能率を大幅に向上せしめることができ、この
結果大幅なコストダウンが図れる等、本発明は優
れた効果を奏する。[Table] From Table 2, when the method of the present invention was used, the passing rate of finishing quality was high, and good results were obtained. In addition, it was confirmed that the method of the present invention can improve work efficiency by about 14% compared to the conventional method because the alignment work can be performed quickly and the time required for bead polishing can be shortened. Ta. In the case of the method of the present invention as described above, a copper stopper which is provided with a curved groove for forming a smooth-shaped Uranami bead and is water-coolable is removably fixed to the outer surface of the pipe end abutting part. However, since the pipe end abutting portions are welded according to welding conditions determined in advance through experiments, efficient welding can be performed, and
Good welding finish quality can be obtained. In addition, in the case of the embodiment described above, the root gap is set to substantially 0, the welded pipe and the unwelded pipe are butted against each other, and the grooves of the butted portion are temporarily welded to connect both pipes. Since the pipes are connected in alignment, it is easy to position both pipes in the axial direction, and the alignment work can be done quickly without the need for "horses" as in the conventional method, which further improves the welding work. The present invention has excellent effects, such as greatly improving overall efficiency and resulting in significant cost reductions.
第1図は本発明方法の実施状態を示す正面図、
第2図は溶接ヘツド周りの拡大図、第3図は当金
の拡大横断面図、第4図は溶接位置を示す略示正
面図、第5図は従来方法の実施状態を示す部分縦
断面図、第6図はその部分横断面図である。
1……既溶接管、2……未溶接管、3,3……
当金、15……溶接ヘツド、21……溶接トー
チ。
FIG. 1 is a front view showing the implementation state of the method of the present invention;
Figure 2 is an enlarged view of the area around the welding head, Figure 3 is an enlarged cross-sectional view of the welding metal, Figure 4 is a schematic front view showing the welding position, and Figure 5 is a partial vertical cross-section showing the state of implementation of the conventional method. FIG. 6 is a partial cross-sectional view thereof. 1...Welded pipe, 2...Unwelded pipe, 3,3...
Welding money, 15... welding head, 21... welding torch.
Claims (1)
合せ部の外面に当金を装着し、その内表面に沿う
ようにして周回移動可能になしてある溶接トーチ
を用いて、該突き合せ部を自動溶接する方法にお
いて、 2つの大径鋼管を芯合せして突き合せ、仮溶接
し、裏波ビードのための溝を管側に形成してあ
り、また、水冷可能にしてある銅製の当金を着脱
可能にその突き合せ部に外嵌固着し、突き合せ部
の周方向位置に応じて、前記溶接トーチ先端の管
内表面に対する距離及び該溶接トーチの管内表面
の法線に対する管周方向の傾き角度を変更しつ
つ、突き合せ部を溶接することを特徴とする自動
溶接方法。 2 前記突き合せ部のルートギヤツプは実質的に
0とすることを特徴とする特許請求の範囲第1項
記載の自動溶接方法。[Scope of Claims] 1. A welding torch that abuts the ends of large-diameter steel pipes against each other, attaches a stopper to the outer surface of the abutted portion, and is movable around the inner surface of the abutment. In this method, two large-diameter steel pipes are aligned, butted, temporarily welded, and a groove for the uranami bead is formed on the pipe side. A copper stopper is removably fixed to the abutting portion, and the distance of the tip of the welding torch to the inner surface of the pipe and the inner surface of the welding torch are determined depending on the circumferential position of the abutting portion. An automatic welding method characterized by welding abutted portions while changing the inclination angle in the pipe circumferential direction with respect to the normal line. 2. The automatic welding method according to claim 1, wherein the root gap of the abutting portion is substantially zero.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28128484A JPS61159275A (en) | 1984-12-28 | 1984-12-28 | Automatic welding method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP28128484A JPS61159275A (en) | 1984-12-28 | 1984-12-28 | Automatic welding method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61159275A JPS61159275A (en) | 1986-07-18 |
JPH0429471B2 true JPH0429471B2 (en) | 1992-05-19 |
Family
ID=17636927
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP28128484A Granted JPS61159275A (en) | 1984-12-28 | 1984-12-28 | Automatic welding method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61159275A (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5107518B2 (en) * | 2005-11-22 | 2012-12-26 | シロキ工業株式会社 | Welding apparatus and welding method |
JP2011189363A (en) * | 2010-03-15 | 2011-09-29 | Nippon Steel & Sumikin Welding Co Ltd | Horizontal gas shield arc welding method |
US11767934B2 (en) | 2013-05-23 | 2023-09-26 | Crc-Evans Pipeline International, Inc. | Internally welded pipes |
US10480862B2 (en) | 2013-05-23 | 2019-11-19 | Crc-Evans Pipeline International, Inc. | Systems and methods for use in welding pipe segments of a pipeline |
US10589371B2 (en) * | 2013-05-23 | 2020-03-17 | Crc-Evans Pipeline International, Inc. | Rotating welding system and methods |
US10695876B2 (en) | 2013-05-23 | 2020-06-30 | Crc-Evans Pipeline International, Inc. | Self-powered welding systems and methods |
US10828715B2 (en) | 2014-08-29 | 2020-11-10 | Crc-Evans Pipeline International, Inc. | System for welding |
AU2015387441B2 (en) * | 2015-03-26 | 2021-06-10 | Crc-Evans Pipeline International, Inc. | Rotating welding system and methods |
US11458571B2 (en) | 2016-07-01 | 2022-10-04 | Crc-Evans Pipeline International, Inc. | Systems and methods for use in welding pipe segments of a pipeline |
-
1984
- 1984-12-28 JP JP28128484A patent/JPS61159275A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS61159275A (en) | 1986-07-18 |
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