JPH0694077B2 - Reinforcement welding method for existing pipe weld defect - Google Patents
Reinforcement welding method for existing pipe weld defectInfo
- Publication number
- JPH0694077B2 JPH0694077B2 JP63277454A JP27745488A JPH0694077B2 JP H0694077 B2 JPH0694077 B2 JP H0694077B2 JP 63277454 A JP63277454 A JP 63277454A JP 27745488 A JP27745488 A JP 27745488A JP H0694077 B2 JPH0694077 B2 JP H0694077B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- pipe
- pretreatment
- main
- existing pipe
- 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
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Description
【発明の詳細な説明】 [産業上の利用分野] 本発明は溶接欠陥部の補強溶接方法、特に既設鋼管の継
手部の補強溶接を内面から効率良く行う溶接方法に関す
るものである。Description: TECHNICAL FIELD The present invention relates to a method for reinforcing welding of a welding defect portion, and more particularly to a welding method for efficiently performing reinforcing welding of a joint portion of an existing steel pipe from the inner surface.
[従来の技術] 既設鋼管の溶接欠陥部の補強手段としては、管の撤去入
れ替え、または管外面からの修理バンド装着などの方法
が採用されている。例えば、特開昭62−158570号公報に
は、既設管の不良箇所の周囲に補強部材(修理バンド)
を自動的に溶接する補強溶接方法が開示されている。[Prior Art] As a reinforcing means for a weld defect portion of an existing steel pipe, a method such as removal and replacement of the pipe, or attachment of a repair band from the outer surface of the pipe is adopted. For example, Japanese Patent Laid-Open No. 62-158570 discloses a reinforcing member (repair band) around a defective portion of an existing pipe.
A reinforced welding method for automatically welding is disclosed.
また、中小口径管の如く管内部に作業員が入れない場
合、管内面からの補強を遠隔操作にて行う装置として、
特開昭56−114577号公報のものが知られている。Also, when a worker cannot enter the inside of a pipe such as a small-medium diameter pipe, as a device that remotely reinforces the inside of the pipe,
The thing of Unexamined-Japanese-Patent No. 56-114577 is known.
[発明が解決しようとする課題] しかしながら、特開昭62−158570号公報に示す外面から
の補強方法は、他の構造物障害、地域環境障害、交通障
害などが発生するため、現在では採用し難い面があると
同時に、橋台背面、伏越し部などの補強の場合のよう
に、場所的な制約のため作業できない不都合がある。[Problems to be Solved by the Invention] However, the method of reinforcing from the outer surface disclosed in Japanese Patent Laid-Open No. 62-158570 has been adopted at present because other structural obstacles, regional environmental obstacles, traffic obstacles and the like occur. At the same time, there are some difficulties, and there is the inconvenience of not being able to work due to space restrictions, such as when reinforcing the back of abutments or overhangs.
また、他方の特開昭56−114577号公報の装置では、確か
に管内面の補強溶接を遠隔操作にて実施する機構は開示
しているが、溶接補強すべき箇所が溶接に適した状態に
なっているかについては何らの注意も払っていない。Further, the other device disclosed in Japanese Patent Laid-Open No. Sho 56-114577 discloses a mechanism for performing the reinforcement welding of the inner surface of the pipe by remote control, but the place to be weld-reinforced is in a state suitable for welding. I haven't paid any attention to what is going on.
すなわち、一般にガスアーク溶接では母材の汚れの影響
を受けやすく、油脂・水分・錆などは充分に除去するこ
とが要求される。また、実際の補強部に内面側には、有
機物や無機物が付着堆積していることがあり、これら付
着物が欠陥部の深部まで浸透している場合には、欠陥部
のすべてをグラインダなどにて研削しない限り、除去す
ることは困難である。しかし、現状では管内面の所定の
補強箇所を選択的にかつ効果的に研削する手段は開発さ
れていなかった。That is, in general, gas arc welding is easily affected by contamination of the base material, and it is required to sufficiently remove oil, water, rust and the like. In addition, organic substances and inorganic substances may be deposited and deposited on the inner surface of the actual reinforcing portion.If these deposits penetrate to the deep portion of the defective portion, all of the defective portion should be transferred to the grinder etc. It is difficult to remove unless ground and ground. However, at present, a means for selectively and effectively grinding a predetermined reinforced portion on the inner surface of the pipe has not been developed.
したがって、管内面からの補強溶接に際しては、このよ
うな付着堆積物を残したまま溶接しなければならない場
合が生じる。その結果、これら付着堆積物によりピット
・ブローホール・ハンビング・ビードの垂れ落ちなどの
溶接欠陥を生じていた。Therefore, in the case of reinforcement welding from the inner surface of the pipe, there may be a case where it is necessary to perform welding while leaving such adhered deposits. As a result, these deposits caused welding defects such as pits, blowholes, humming, and bead drop.
本発明は、このような問題点を解消するもので、既設管
の欠陥部を内面側から補強する際、溶接に悪影響を及ぼ
す付着堆積物が被溶接箇所に残存していても、充分な品
質の欠陥のない補強溶接部が得られる補強溶接方法を提
供することを目的とする。The present invention solves such a problem, and when reinforcing the defective portion of the existing pipe from the inner surface side, even if the adhered deposit that adversely affects the welding remains at the welded portion, sufficient quality is obtained. It is an object of the present invention to provide a reinforcement welding method capable of obtaining a reinforcement welded portion without defects.
[課題を解決するための手段] この目的を達成するための本発明の補強溶接方法は、既
設管の溶接欠陥部を管内面から補強溶接するに際し、本
溶接前に前記溶接欠陥部に付着した堆積物を燃焼・溶融
させる前処理を施した後、該欠陥部を本溶接することを
特徴とする。この堆積物の燃焼・溶融を行う前処理は、
本溶接に用いる消耗電極を用いた溶接機器と同一のもの
を使用しそのアーク熱を利用して行うことが好ましい。[Means for Solving the Problem] The reinforcing welding method of the present invention for achieving this object is to adhere to the welding defect portion before the main welding when the welding defect portion of the existing pipe is subjected to the reinforcement welding from the inner surface of the pipe. After the pretreatment for burning and melting the deposit, the defective portion is main-welded. The pretreatment for burning and melting this deposit is
It is preferable to use the same welding equipment as that using the consumable electrode used for the main welding and to utilize the arc heat.
[作用] 本発明では、あらかじめ補強部位となる溶接欠陥部をア
ーク熱等により前処理するものであるから、欠陥部に残
存する付着堆積物はほぼ完全に燃焼消耗され、後続する
本溶接が支障なく実施でき、良好な品質の補強溶接部が
得られることになる。[Operation] In the present invention, since the welding defect portion to be a reinforcing portion is pretreated by arc heat or the like, the adhered deposit remaining on the defect portion is almost completely burned and consumed, and the subsequent main welding is hindered. It can be carried out without any trouble and a good quality reinforcing welded portion can be obtained.
[発明の好ましい実施態様] 以下本発明溶接方法を図面に基いて詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION The welding method of the present invention will be described in detail below with reference to the drawings.
第図は本発明の工程の一例を模式的に示すもので、大体
管径600mm,板厚板厚9.5mm程度の既設管1,2の継手部外面
側1Aからの溶接によって実施した既溶接部3有する管を
例にした場合を示している。この既設管の既溶接部3内
面側1Bに溝状欠陥部4が存在している場合、これを放置
すると管の破損の原因になるので、該欠陥部4位置にて
補強溶接を行う。FIG. 1 schematically shows an example of the process of the present invention, in which the existing welded portion is formed by welding from the outer surface side 1A of the joint portion of the existing pipes 1 and 2 having a pipe diameter of approximately 600 mm and a plate thickness of approximately 9.5 mm. The case where the tube having 3 is taken as an example is shown. When the groove-shaped defect portion 4 is present on the inner surface side 1B of the existing welded portion 3 of this existing pipe, leaving the groove-shaped defect portion 4 will cause damage to the pipe. Therefore, reinforcement welding is performed at the position of the defective portion 4.
なお、この補強溶接を行う溶接設備としては、既設管の
内部に装入されて必要な各種操作を円滑に遂行する構造
のものが要求されるが、第4図にその一連の台車群の具
体例を示している。即ち、先頭の溶接台車15には必要な
研掃部材、溶接トーチ、検査機などの溶接機器とその駆
動・制御機構が搭載され、該台車15に後続してワイヤ台
車15、クランプ台車17、駆動(シリンダ)台車18、バル
ブ台車19などが配列される。The welding equipment for this reinforcement welding is required to have a structure that can be inserted into an existing pipe to smoothly carry out various necessary operations. An example is shown. That is, the welding machine 15 at the front is equipped with necessary polishing and cleaning members, welding torches, welding equipment such as an inspection machine, and its drive / control mechanism, and following the carriage 15, the wire carriage 15, the clamp carriage 17, and the drive. (Cylinder) carriage 18, valve carriage 19 and the like are arranged.
溶接欠陥部4の内部には油脂や錆5などが付着堆積して
いるので、本発明においては、まず、該欠陥部、即ち補
強部位に対し、本溶接を行うガスアーク溶接装置によ
り、あらかじめ前処理溶接を実施する。この前処理溶接
は、補強部位を溶接する必要はないので、溶着量の少な
い条件(低入熱)でアーク熱を発生させ、欠陥部4内部
の付着堆積物5を燃焼・溶融させる。第1図(b)の6
が前処理溶接部を示している。Since fats and oils, rust 5 and the like are adhered and deposited inside the welding defect portion 4, first, in the present invention, the defect portion, that is, the reinforcing portion is pre-treated in advance by a gas arc welding apparatus for performing main welding. Carry out welding. In this pretreatment welding, since it is not necessary to weld the reinforcing portion, arc heat is generated under the condition that the amount of welding is small (low heat input), and the deposit 5 inside the defect portion 4 is burned and melted. 6 in FIG. 1 (b)
Indicates the pretreatment weld.
次に、前処理溶接終了後、第1図(c)に示す如く、直
ちに溶接装置により2パスの本溶接を実施する。図にお
いて7aが本溶接の第1パス目の溶接部、7bが第2パス目
の溶接部である。この本溶接の第1パス目では、前記前
処理溶接部6を包含した溶接を行うが、これにより前処
理溶接部6は再溶融して本溶接と一体になり、その結果
前処理溶接部6欠陥のある状態であっても本溶接により
最終的には安定した溶接品質を確保できる。Next, after the completion of the pretreatment welding, as shown in FIG. 1 (c), two-pass main welding is immediately performed by the welding device. In the figure, 7a is the weld portion of the first pass of the main welding, and 7b is the weld portion of the second pass. In the first pass of the main welding, the welding including the pretreatment welded portion 6 is performed. As a result, the pretreatment welded portion 6 is remelted and integrated with the main welding, and as a result, the pretreatment welded portion 6 is obtained. Even if there is a defect, the final welding can ensure stable welding quality.
第1図(d)は本溶接を6パスで行った例を示してい
る。8a〜8fが6パスの溶接部をそれぞれ示しており、前
処理溶接部6は大体8cパス目の本溶接にて再溶融され
る。FIG. 1 (d) shows an example in which the main welding is performed in 6 passes. 8a to 8f show welds of 6 passes, respectively, and the pretreatment weld 6 is remelted in the main welding of pass 8c.
この前処理溶接は、溶着金属の垂れ落ちが発生して本溶
接に悪影響を及ぼさないように、可及的に溶着量の少な
い本溶接に比し相対的に低入熱で、かつアークの切れの
ないことが要求されることから、およそ4.5KJ/cm程度が
好ましい。ただし、溶接姿勢、例えば下向き溶接のよう
に垂れ落ちの生じない溶接では、上記の入熱重は大きく
することができる。This pretreatment welding has relatively low heat input and arc breakage compared to the main welding with the smallest possible welding amount, so that the deposited metal does not drop and does not adversely affect the main welding. Therefore, about 4.5 KJ / cm is preferable. However, in the welding posture, for example, in the welding such as the downward welding in which the sagging does not occur, the heat input weight can be increased.
なお、上記の図示の例では、前処理溶接は、本溶接を行
うものと同一の消耗電極を用いた溶接機器を用いて行っ
た場合を示したが、本発明ではこれに限らず、例えば溶
接トーチとは別に適当な燃焼バーナを近接して設けてお
き、これにより付着堆積物を燃焼させることもできる。
しかし、設備面や作業面の複雑さを考慮すれば、同一溶
接機器を用いる場合が好ましいのは勿論である。In the above illustrated example, the pretreatment welding is performed using the welding equipment using the same consumable electrode as the main welding, but the present invention is not limited to this and, for example, welding In addition to the torch, a suitable combustion burner may be provided in the vicinity of the torch to burn the deposited deposit.
However, it is of course preferable to use the same welding equipment in consideration of the complexity of equipment and work.
[実施例] 第3図に示す人工欠陥継手(母材材質JIS SS41、板厚10
mm,溝部寸法、幅5mm,深さ5mm)を製作し、その溝部9に
タール10を0.3g/cm塗布して本発明の補強溶接及び従来
の溶接を実施した。その時の溶接条件は次の表1に示す
通りである。[Example] An artificial defect joint shown in Fig. 3 (base material JIS SS41, plate thickness 10
mm, groove size, width 5 mm, depth 5 mm) was produced, and tar 10 was applied to the groove 9 at 0.3 g / cm to carry out the reinforcement welding of the present invention and conventional welding. The welding conditions at that time are as shown in Table 1 below.
上記の溶接の結果、本発明方法によると、第2図(a)
に示すように、本溶接の1パス目の溶接ビード11には何
らの欠陥のない美麗な外観が得られるとともに、その引
張強度も充分満足すべき値を示した。これに対し従来法
によると、第2図(b)に示す如く、1パス目の溶接ビ
ード12ピット13や垂れ落ち14などの欠陥が見られ、また
ビード高さ及びビード幅のバラツキが激しく、ビードを
研削した後再度補強溶接を施さなければ、補強部の充分
な品質を確保できない。 As a result of the above welding, according to the method of the present invention, FIG.
As shown in (1), the weld bead 11 in the first pass of the main welding had a beautiful appearance without any defects, and the tensile strength thereof was also a sufficiently satisfactory value. On the other hand, according to the conventional method, as shown in FIG. 2 (b), defects such as the welding bead 12 pit 13 and the sag 14 of the first pass are seen, and the bead height and the bead width vary greatly. If reinforcement welding is not performed again after grinding the bead, sufficient quality of the reinforcement cannot be secured.
[発明の効果] 以上説明したような本発明方法を用いれば、補強箇所の
研削を充分に行い得ない状態であっても、既設管の欠陥
部を溶接することが可能となり、大掛りな管外からの補
強工事を必要とせず、管内面より補強することができ
る。また、大溶接と同一の消耗電極を用いた溶接機器を
使用しそのアーク熱を利用して前処理を行なうため、こ
のアークによる前処理は特別な装置を必要とせずに実施
できるため、非常に経済的であり、また能率的である。
さらに、アーク熱は、消耗電極を用いた溶接機器を使用
しているため、電極が自動的に送給されるためアークが
一時的に途切れてもすぐ復活し、連続的な安定したアー
クを得ることができる。[Advantages of the Invention] By using the method of the present invention as described above, it becomes possible to weld a defective portion of an existing pipe even in a state where the reinforcing portion cannot be sufficiently ground, and thus a large pipe is required. It can be reinforced from the inner surface of the pipe without requiring external reinforcement work. In addition, since the welding equipment using the same consumable electrode as the large welding is used and the pretreatment is performed by utilizing the arc heat, the pretreatment by this arc can be carried out without requiring a special device, so it is extremely It is both economical and efficient.
Furthermore, since the arc heat uses welding equipment with a consumable electrode, the electrode is automatically fed, so even if the arc is temporarily interrupted, it will recover immediately and a continuous stable arc will be obtained. be able to.
第1図(a)(b)(c)(d)は本発明方法を説明す
るための溶接継手部の補強溶接を行う工程図を示す。第
2図(a)(b)は本発明法と従来法との補強溶接によ
りそれぞれ得られたビード外観図、第3図は本発明の実
施例における試験材料の概要を示す断面図、第4図は本
発明の溶接方法を実施する場合に用いる溶接台車とこれ
に接続する各種台車群を示す概略図である。 1,2……既設管、3……既溶接部、4……溶接欠陥部、
5……付着堆積物、6……前処理溶接部、7,8……本溶
接部、9……溝、10……タール、11,12……溶接ビー
ド、13……ピット、14……垂れ落ち部分FIGS. 1 (a), (b), (c) and (d) show process diagrams for carrying out reinforcement welding of a welded joint portion for explaining the method of the present invention. 2 (a) and 2 (b) are bead appearance views obtained by the reinforcement welding of the method of the present invention and the conventional method, respectively, and FIG. 3 is a cross-sectional view showing the outline of test materials in the examples of the present invention. The figure is a schematic view showing a welding carriage used when carrying out the welding method of the present invention and a group of various carriages connected to the welding carriage. 1,2 …… Existing pipe, 3 …… Existing welded part, 4 …… Welding defect part,
5 ... Adhered deposits, 6 ... Pretreatment welds, 7,8 ... Main welds, 9 ... Grooves, 10 ... Tar, 11,12 ... Weld beads, 13 ... Pits, 14 ... Drooping part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 迫間 隆司 大阪府大阪市此花区酉島5―11―61 大阪 瓦斯株式会社導管技術センター内 (72)発明者 土谷 雅敏 大阪府大阪市此花区酉島5―11―61 大阪 瓦斯株式会社導管技術センター内 (56)参考文献 特開 昭60−92074(JP,A) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Sakoma 5-11-61 Torishima, Konohana-ku, Osaka City, Osaka Prefecture (11-61) Inside the Pipeline Technology Center, Osaka Gas Co., Ltd. (72) Masatoshi Tsuchiya 5-Toroshima, Konohana-ku, Osaka City, Osaka Prefecture 11-61 Osaka Gas Co., Ltd. Conduit Technology Center (56) Reference JP-A-60-92074 (JP, A)
Claims (1)
するに際し、本溶接前に本溶接に用いる消耗電極を用い
た同一溶接機器を使用しそのアーク熱を利用して前記溶
接欠陥部に付着した堆積物を焼結・溶融させる前処理を
施した後、直ちに本溶接に移行させることを特徴とする
溶接欠陥部の補強溶接方法。1. When the welding defective portion of an existing pipe is reinforced and welded from the inner surface of the pipe, the same welding equipment using the consumable electrode used for the main welding is used before the main welding, and the arc heat is used to make use of the welding defective portion. A method for reinforcing welding of a welding defect portion, which comprises performing a pretreatment for sintering and melting the deposit adhered to, and immediately transferring to main welding.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63277454A JPH0694077B2 (en) | 1988-11-04 | 1988-11-04 | Reinforcement welding method for existing pipe weld defect |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63277454A JPH0694077B2 (en) | 1988-11-04 | 1988-11-04 | Reinforcement welding method for existing pipe weld defect |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02127990A JPH02127990A (en) | 1990-05-16 |
JPH0694077B2 true JPH0694077B2 (en) | 1994-11-24 |
Family
ID=17583808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63277454A Expired - Fee Related JPH0694077B2 (en) | 1988-11-04 | 1988-11-04 | Reinforcement welding method for existing pipe weld defect |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0694077B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4903888A (en) | 1988-05-05 | 1990-02-27 | Westinghouse Electric Corp. | Turbine system having more failure resistant rotors and repair welding of low alloy ferrous turbine components by controlled weld build-up |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6092074A (en) * | 1983-10-21 | 1985-05-23 | Ishikawajima Harima Heavy Ind Co Ltd | Method of pre-processing of metal |
-
1988
- 1988-11-04 JP JP63277454A patent/JPH0694077B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH02127990A (en) | 1990-05-16 |
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Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |