JPH06335768A - Method for welding fixed tube - Google Patents
Method for welding fixed tubeInfo
- Publication number
- JPH06335768A JPH06335768A JP5145682A JP14568293A JPH06335768A JP H06335768 A JPH06335768 A JP H06335768A JP 5145682 A JP5145682 A JP 5145682A JP 14568293 A JP14568293 A JP 14568293A JP H06335768 A JPH06335768 A JP H06335768A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- fixed tube
- fixed pipe
- bead
- layer
- 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.)
- Pending
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- Butt Welding And Welding Of Specific Article (AREA)
- Laser Beam Processing (AREA)
- Arc Welding In General (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は固定管の溶接方法に関
し、特に中径〜大径の水平固定管における溶接に適して
いる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for welding a fixed pipe, and is particularly suitable for welding a medium to large diameter horizontal fixed pipe.
【0002】[0002]
【従来の技術及び発明が解決しようとする課題】従来、
中径又は大径の固定管の溶接を行う場合、内面又は外
面から、360゜周に沿ってぐるりと溶接する方法、或
いは、地から天側に沿って内面から半分宛、又は外面
から半分宛溶接する方法が採られていた。例えば、特開
昭55−141395号、特開平4−322884号な
どが提案されている。2. Description of the Related Art Conventionally, the problems to be solved by the invention
When welding a medium- or large-diameter fixed pipe, a method of welding around the 360 ° circumference from the inner or outer surface, or half from the inner surface to the half or from the outer surface to the top side The method of welding was adopted. For example, JP-A-55-141395 and JP-A-4-322884 are proposed.
【0003】しかしながら、従来技術では、いずれも、
下向きから立向きを経て上向きに至る全姿勢溶接を初層
から最終層まで行うことになり、能率的には最も能率性
の低い上向き姿勢に全姿勢の溶接条件を合わせざるを得
なくなり、以下のような問題点があった。However, in the prior art, both
We will perform all posture welding from downward to vertical to upward, from the first layer to the final layer, and in terms of efficiency, we will have to match the welding conditions of all postures to the upward posture with the lowest efficiency. There was such a problem.
【0004】能率が悪い、 初層はTIGで2層目以降は別の溶接方法でと云うよ
うに変えざるを得ない、 初層を例えば外周から溶接
する場合、天の近傍では裏波過多、逆に地近傍では裏波
不足になり易く、安定したビードを形成しにくい。Inefficiency, the first layer is TIG and the second and subsequent layers must be changed by another welding method. For example, when the first layer is welded from the outer periphery, there is excessive back wave near the sky. On the contrary, in the vicinity of the ground, back waves tend to be insufficient, and it is difficult to form stable beads.
【0005】本発明は、上記従来技術の問題点を解決し
て、高速、高能率で固定管を溶接する方法を提供するこ
とを目的としている。An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method for welding a fixed pipe at high speed and with high efficiency.
【0006】本発明者は、前記課題を解決するために鋭
意研究を重ねた結果、外周と内周とで半分宛溶接するタ
ンデム溶接方法にて、立向きから上向きに至る溶接姿勢
を行う部分を大幅に削減し、高能率化を図った新規な固
定管溶接方法を見出したものである。As a result of earnest studies to solve the above-mentioned problems, the present inventor has conducted a tandem welding method in which the outer circumference and the inner circumference are welded to each other in half, and a portion to be welded from an upright position to an upright position is welded. This is the finding of a new fixed pipe welding method that has achieved a significant reduction and improved efficiency.
【0007】すなわち、本発明は、水平或いは傾斜姿勢
で突き合わされた固定管の初層溶接に当り、固定管円周
の南半球部を固定管内面側より溶接し、固定管円周の北
半球部を固定管外面側より溶接することを特徴とする固
定管の溶接方法を要旨としている。That is, according to the present invention, in the first layer welding of fixed pipes which are butted in a horizontal or inclined posture, the southern hemisphere of the fixed pipe circumference is welded from the inner surface of the fixed pipe, and the northern hemisphere of the fixed pipe circumference is welded. The gist is a method of welding a fixed pipe, which is characterized in that welding is performed from the outer surface side of the fixed pipe.
【0008】以下に本発明を更に詳細に説明する。The present invention will be described in more detail below.
【0009】本発明において、固定管の溶接部分を南半
球と北半球に区分して溶接するが、ここで、南半球及び
北半球とは便宜的な呼称であり、パイプ断面の天側を含
む半分を北半球、地側を含む半分を南半球と区分する。
したがって、図1に示すように、O−Oを結ぶ線によっ
て上側を北半球、下側と南半球の如く厳密に区分する必
要はなく、O−O線を多少ずらしたO´−O´線、或い
はO″−O″線を北半球と南半球の区分線としても、実
用上問題はない。In the present invention, the welded portion of the fixed pipe is divided into the southern hemisphere and the northern hemisphere and welded. Here, the southern hemisphere and the northern hemisphere are convenient names, and the half including the top side of the pipe cross section is the northern hemisphere. The half including the ground side is separated from the southern hemisphere.
Therefore, as shown in FIG. 1, it is not necessary to strictly divide the upper side into the northern hemisphere, the lower side and the southern hemisphere by the line connecting O-O, and the O'-O 'line with the O-O line slightly shifted, or Even if the O "-O" line is used as a dividing line between the northern hemisphere and the southern hemisphere, there is no practical problem.
【0010】溶接能率は特に上向き姿勢での能率に左右
されることに鑑みて、本発明では、図2に示すように、
固定管円周の南半球部(A)を固定管内面側より溶接し、
固体管円周の北半球部(B)を固定管外面側より溶接す
る。これにより、全体を下向き姿勢での溶接、或いは大
部分が下向き姿勢で、一部が立向き姿勢での溶接にでき
るので、上向き姿勢での溶接を回避でき、高能率化を図
ることができる。In view of the fact that the welding efficiency depends on the efficiency particularly in the upward posture, in the present invention, as shown in FIG.
Weld the southern hemisphere (A) of the circumference of the fixed pipe from the inside of the fixed pipe,
Weld the northern hemisphere (B) of the circumference of the solid pipe from the outer surface side of the fixed pipe. As a result, the entire welding can be performed in the downward posture, or most of the welding can be performed in the downward posture and a part of the welding can be performed in the vertical posture, so that the welding in the upward posture can be avoided and the efficiency can be improved.
【0011】この溶接方式における溶接法、溶接手順等
々については種々の態様が可能である。Various modes are possible for the welding method, welding procedure, and the like in this welding method.
【0012】溶接法:溶接法としては特に限定されるも
のではない。レーザーやプラズマといった高エネルギー
ビームを熱源として用いる溶接法のほか、TIGやMI
Gのような従来溶接法であっても、高能率化が可能であ
る。Welding method: The welding method is not particularly limited. Welding methods that use high-energy beams such as lasers and plasmas as heat sources, as well as TIG and MI
Even with the conventional welding method such as G, high efficiency can be achieved.
【0013】高エネルギービームを熱源として用いる溶
接法が有効であるが、プラズマを熱源とするキーホール
溶接が能率向上の面から特に適している。ここで、キー
ホール溶接とは、プラズマ溶接の最も特徴的な裏波溶接
法である(図3)。比較的大電流のプラズマアークは細く
絞られ、母材を局部的に加熱すると共に高速で噴出する
プラズマガスが溶融金属を強く押し下げるため、小穴
(キーホール)を生じる。溶接の進行と共にキーホールの
先端は母材を溶融しながら進むが、溶融金属は溶融池壁
面に沿って後方に移動しキーホールの後方を塞ぐため、
キーホールはほぼ一定の形状を保つ溶接法である。A welding method using a high energy beam as a heat source is effective, but keyhole welding using plasma as a heat source is particularly suitable in terms of efficiency improvement. Here, keyhole welding is the most characteristic backside welding method of plasma welding (Fig. 3). A plasma arc with a relatively large current is narrowed down and locally heats the base material, and at the same time, the plasma gas ejected at a high speed strongly pushes down the molten metal.
(Keyhole) occurs. As the welding progresses, the tip of the keyhole advances while melting the base metal, but the molten metal moves backward along the wall surface of the molten pool and blocks the rear of the keyhole.
The keyhole is a welding method that maintains an almost constant shape.
【0014】溶接手順:固定管内面側よりの溶接と、固
定管外面側よりの溶接は、時間的にずらして行っても、
或いは同時に行うこともできる。2台の溶接機を用いて
同時に行うと更に溶接能率を向上させることができる。Welding procedure: Even if the welding from the inner surface side of the fixed pipe and the welding from the outer surface side of the fixed pipe are performed with a temporal shift,
Alternatively, they can be performed simultaneously. If two welding machines are used at the same time, the welding efficiency can be further improved.
【0015】また、本発明は、初層溶接のみで足りる溶
接施工の場合に適用できるほか、多層溶接の場合にも初
層溶接として適用できる。多層溶接の場合、例えば、2
層目以降は継手全周にわたり固定管の内面及び/又は外
面を全姿勢溶接する。The present invention can be applied not only in the case of welding work in which only the first layer welding is sufficient, but also in the case of multilayer welding as the first layer welding. In the case of multi-layer welding, for example, 2
After the second layer, the inner surface and / or the outer surface of the fixed tube are welded in all positions over the entire circumference of the joint.
【0016】勿論、各種溶接法の溶接条件も適宜決める
ことができるのは云うまでもない。その際、特にプラズ
マアーク溶接の場合においては、以下に示すような点に
配慮することが好ましい。Of course, it goes without saying that the welding conditions of various welding methods can be appropriately determined. At that time, in the case of plasma arc welding, it is preferable to consider the following points.
【0017】固定管の溶接における能率が一般的に低下
するのは上向き溶接個所であり、上向き溶接個所をでき
るだけ少なくするのが望ましい。図11は固定管の外側
と内側とで行う場合のビード継ぎ方法として、上向き溶
接個所を極力少なくした方法を示している。すなわち、
初層のキーホール溶接における内外からの溶接ビードを
ある一定幅(L1、L2)だけラップさせて不連続個所をな
くしビード継ぎを完成させる方法である。The efficiency of welding of the fixed pipe generally decreases at the upward welding points, and it is desirable to minimize the upward welding points. FIG. 11 shows a bead splicing method in which the outer side and the inner side of the fixed tube are connected, in which the number of upward welding points is minimized. That is,
This is a method in which welding beads from the inside and outside of the first layer keyhole welding are wrapped by a certain width (L 1 , L 2 ) to eliminate discontinuous points and complete the bead joining.
【0018】ラップ幅Lについては、固定管の直径、板
厚、開先形状、溶接条件にもよるが、5mm未満では重な
り部分が十分でなく、ビード形状を整えることが困難で
アンダーカット等の溶接欠陥を生じ易いので、安定した
ビード重なり部を得るにはこのラップ幅Lが5mm以上が
望ましい。Regarding the lap width L, depending on the diameter of the fixed tube, the plate thickness, the groove shape, and the welding conditions, if the lap width is less than 5 mm, the overlapping portion is insufficient, and it is difficult to adjust the bead shape, and undercut or the like occurs. Since a welding defect is likely to occur, the lap width L is preferably 5 mm or more in order to obtain a stable bead overlapping portion.
【0019】このビード継ぎ方法は、初層のキーホール
溶接を終えた2パス目以降の同様の溶接方法の場合に
も、また全姿勢溶接を行う場合にも適用できるが、より
望ましくは、前ビードのラップ部とラップ個所が重なら
ない方がより確実な溶接ができる。This bead splicing method can be applied to the same welding method after the second pass after finishing the keyhole welding of the first layer, and also to the case of performing all-position welding, but more preferably, It is possible to perform more reliable welding if the lap portion of the bead does not overlap the lap portion.
【0020】更に、いずれのラップ部においても溶接電
流、プラズマガス流量のいずれか一方又は両方ともラッ
プ部以外の溶接個所の溶接条件より高くしないことが望
ましい。これらの条件が逆転すると、ラップ部の方が溶
接ビード高さが極端に大きくなる結果、次のビードが形
成しにくいばかりか、結果的に融合不良等の原因とな
る。また必要に応じ、ラップ部の溶接速度を遅くするか
又は停止時間を設けても良い。Further, it is desirable that at least one of the welding current and the flow rate of the plasma gas in any of the lap portions is not higher than the welding condition of the welding portion other than the lap portion. If these conditions are reversed, the weld bead height in the lap portion becomes extremely large, and as a result, not only the next bead is difficult to form, but also fusion failure or the like eventually occurs. If necessary, the welding speed of the lap portion may be reduced or a stop time may be provided.
【0021】次に本発明の実施例を示す。Next, examples of the present invention will be described.
【0022】[0022]
【実施例1】本例は、プラズマアーク溶接法により初層
溶接後、固定管の内面及び外面の両方から全姿勢溶接し
た例である。Example 1 This example is an example in which after welding the first layer by the plasma arc welding method, all the positions were welded from both the inner surface and the outer surface of the fixed tube.
【0023】まず、図4に示す固定管の開先継手を、南
半球部を内面から、北半球を外面からそれぞれキーホー
ル溶接法により初層溶接を同時に実施した。図中、ビー
ド1が初層である。次いで、非キーホール溶接法により
2〜3層目を内面及び外面から各々同時に累層した。図
中、2、3は外面ビードであり、4、5は内面ビードで
ある。First, in the groove joint of the fixed pipe shown in FIG. 4, the first layer welding was simultaneously performed by the keyhole welding method from the inner surface of the southern hemisphere and the outer surface of the northern hemisphere. In the figure, the bead 1 is the first layer. Then, the second to third layers were simultaneously formed from the inner surface and the outer surface by the non-keyhole welding method. In the figure, 2 and 3 are external beads, and 4 and 5 are internal beads.
【0024】なお、供試材はAPI 5L−X60鋼(板
厚19mm)で管径20インチのものを使用した。プラズ
マアーク溶接条件を表1に示す。The test material used was API 5L-X60 steel (plate thickness 19 mm) and had a tube diameter of 20 inches. Table 1 shows the plasma arc welding conditions.
【0025】[0025]
【表1】 [Table 1]
【0026】[0026]
【実施例2】本例は、レーザー溶接法により初層溶接
後、固定管の内面及び外面の両方から全姿勢溶接した例
である。[Embodiment 2] This embodiment is an example in which after the first layer welding by the laser welding method, all the posture welding is performed from both the inner surface and the outer surface of the fixed tube.
【0027】まず、図5に示す固定管の開先継手を、南
半球部を内面から、北半球を外面からそれぞれレーザー
溶接法により初層溶接を同時に実施した。図中、ビード
1が初層である。次いで、レーザー溶接法により2〜3
層目を内面及び外面からそれぞれ累層した。図中、2は
外面ビード、3は内面ビードである。First, in the grooved joint of the fixed pipe shown in FIG. 5, the first layer welding was simultaneously carried out by laser welding from the inner surface of the southern hemisphere and the outer surface of the northern hemisphere. In the figure, the bead 1 is the first layer. Then, 2-3 by laser welding method
Layers were formed from the inner surface and the outer surface, respectively. In the figure, 2 is an outer bead and 3 is an inner bead.
【0028】なお、供試材はAPI 5L−X60鋼(板
厚15mm)で管径20インチのものを使用した。レーザ
ー溶接条件を表2に示す。The test material used was API 5L-X60 steel (plate thickness 15 mm) and had a tube diameter of 20 inches. The laser welding conditions are shown in Table 2.
【0029】[0029]
【表2】 [Table 2]
【0030】[0030]
【実施例3】本例は、プラズマアーク溶接法により初層
溶接後、固定管の外面から全姿勢溶接した例である。[Embodiment 3] This embodiment is an example in which the first layer welding is performed by the plasma arc welding method, and then all the positions are welded from the outer surface of the fixed tube.
【0031】まず、図6に示す固定管の開先継手(外側
のみ開先を設けたY開先)を、南半球部を内面から、北
半球を外面からそれぞれキーホール溶接法により初層溶
接を同時に実施した。図中、ビード1が初層である。次
いで、非キーホール溶接法により2〜3層目を外面から
累層した。図中、2、3が外面ビードである。First, in the groove joint of the fixed pipe shown in FIG. 6 (Y groove having a groove only on the outer side), the first layer welding is performed simultaneously by the keyhole welding method from the inner surface of the southern hemisphere and the outer surface of the northern hemisphere. Carried out. In the figure, the bead 1 is the first layer. Then, the second to third layers were formed from the outer surface by a non-keyhole welding method. In the figure, 2 and 3 are outer beads.
【0032】なお、供試材はAPI 5L−X60鋼(板
厚19mm)で管径30インチのものを使用した。プラズ
マアーク溶接条件を表3に示す。The test material used was API 5L-X60 steel (plate thickness 19 mm) and had a tube diameter of 30 inches. Table 3 shows the plasma arc welding conditions.
【0033】[0033]
【表3】 [Table 3]
【0034】[0034]
【実施例4】本例は、プラズマアーク溶接法により初層
溶接後、固定管の内面から全姿勢溶接した例である。[Embodiment 4] This embodiment is an example in which the first layer welding is performed by the plasma arc welding method, and then all the positions are welded from the inner surface of the fixed tube.
【0035】まず、図7に示す固定管の開先継手(内側
のみ開先を設けたY開先)を、南半球部を内面から、北
半球を外面からそれぞれキーホール溶接法により初層溶
接を同時に実施した。図中、ビード1が初層である。次
いで、非キーホール溶接法により2層目を内面から累層
した。図中、2が内面ビードである。First, in the groove joint of the fixed pipe shown in FIG. 7 (Y groove having a groove only on the inner side), the first layer welding is performed simultaneously by the keyhole welding method from the inner surface of the southern hemisphere and the outer surface of the northern hemisphere. Carried out. In the figure, the bead 1 is the first layer. Then, the second layer was formed from the inner surface by a non-keyhole welding method. In the figure, 2 is an inner bead.
【0036】なお、供試材はAPI 5L−X60鋼(板
厚19mm)で管径30インチのものを使用した。プラズ
マアーク溶接条件を表4に示す。The test material used was API 5L-X60 steel (plate thickness 19 mm) with a tube diameter of 30 inches. Table 4 shows the plasma arc welding conditions.
【0037】[0037]
【表4】 [Table 4]
【0038】[0038]
【実施例5】本例は、プラズマアーク溶接法による初層
溶接のみで固定管の溶接を終了した例である。例えば、
パイプライン用としては比較的薄手の板厚の管の溶接に
適している。[Embodiment 5] This embodiment is an example in which the welding of the fixed pipe is completed only by the first layer welding by the plasma arc welding method. For example,
For pipelines, it is suitable for welding thin pipes.
【0039】まず、図8に示す固定管の開先継手(I開
先)を、裏当材(Cu又はセラミック製)を使用して、南半
球部を内面から、北半球を外面からそれぞれキーホール
溶接法により初層溶接を同時に実施した。図中、ビード
1が初層である。First, the groove joint (I groove) of the fixed pipe shown in FIG. 8 is keyhole welded from the inner surface of the southern hemisphere and the outer surface of the northern hemisphere by using a backing material (made of Cu or ceramic). The first layer welding was performed simultaneously by the method. In the figure, the bead 1 is the first layer.
【0040】なお、供試材はAPI 5L−X60鋼(板
厚12mm)で管径20インチのものを使用した。プラズ
マアーク溶接条件を表5に示す。水素量が多いと割れる
場合があるので、シールドガスとして水素を使用しなか
った。The test material used was API 5L-X60 steel (plate thickness 12 mm) and a pipe diameter of 20 inches. Table 5 shows the plasma arc welding conditions. Hydrogen was not used as a shielding gas because it may crack if the amount of hydrogen is large.
【0041】[0041]
【表5】 [Table 5]
【0042】[0042]
【実施例6】本例は、プラズマアーク溶接法により初層
溶接後、固定管の内面及び外面の両方から全姿勢溶接し
た例である。[Embodiment 6] This embodiment is an example in which after the first layer welding by the plasma arc welding method, the whole position welding is performed from both the inner surface and the outer surface of the fixed tube.
【0043】まず、図9に示す固定管の開先継手(I開
先)を、南半球部を内面から、北半球を外面からそれぞ
れ非キーホール溶接法により初層溶接を同時に実施し
た。図中、ビード1が初層である。次いで、非キーホー
ル溶接法により2層目を内面から累層した。図中、2が
内面ビードである。First, in the grooved joint (I groove) of the fixed pipe shown in FIG. 9, the first layer welding was simultaneously performed by the non-keyhole welding method from the inner surface of the southern hemisphere and the outer surface of the northern hemisphere. In the figure, the bead 1 is the first layer. Then, the second layer was formed from the inner surface by a non-keyhole welding method. In the figure, 2 is an inner bead.
【0044】なお、供試材はAPI 5L−X65鋼(板
厚19mm)で管径30インチのものを使用した。プラズ
マアーク溶接条件を表6に示す。The test material used was API 5L-X65 steel (plate thickness 19 mm) with a tube diameter of 30 inches. Table 6 shows the plasma arc welding conditions.
【0045】[0045]
【表6】 [Table 6]
【0046】[0046]
【実施例7】本例は、プラズマアーク溶接法による初層
溶接のみで固定管の溶接を終了した例である。例えば、
パイプライン用としては比較的薄手の板厚の管の溶接に
適している。[Embodiment 7] This embodiment is an example in which welding of a fixed pipe is completed only by first layer welding by the plasma arc welding method. For example,
For pipelines, it is suitable for welding thin pipes.
【0047】まず、図10に示す固定管の開先継手(I
開先)を、実施例5とは異なり裏当材を使用しないで、
南半球部を内面から、北半球を外面からそれぞれキーホ
ール溶接法により初層溶接を同時に実施した。図中、ビ
ード1が初層である。First, the grooved joint (I
Groove), unlike Example 5, without using a backing material,
First layer welding was performed simultaneously from the inner surface of the southern hemisphere and the outer surface of the northern hemisphere by the keyhole welding method. In the figure, the bead 1 is the first layer.
【0048】なお、供試材はAPI 5L−X65鋼(板
厚12mm)で管径20インチのものを使用した。プラズ
マアーク溶接条件を表7に示す。The test material used was API 5L-X65 steel (plate thickness 12 mm) and had a tube diameter of 20 inches. Table 7 shows the plasma arc welding conditions.
【0049】[0049]
【表7】 [Table 7]
【0050】[0050]
【実施例8】Example 8
【0051】本例は、図12に示す固定管の開先継手を
キーホール溶接法により初層溶接した後、固定管を全姿
勢溶接したもので、ラップ部を設けた例である。図中、
ビード1が初層で、2が外面ビード、3が内面ビードで
ある。なお、供試材はAPI5L−X60鋼(板厚16m
m)で管径20インチのものを使用した。プラズマアーク
溶接条件を表8に示す。In this example, the grooved joint of the fixed tube shown in FIG. 12 was first layer welded by the keyhole welding method, and then the fixed tube was welded in all positions, and a lap portion was provided. In the figure,
Bead 1 is the first layer, 2 is the outer bead, and 3 is the inner bead. The test material is API5L-X60 steel (plate thickness 16 m
m) with a pipe diameter of 20 inches was used. Table 8 shows the plasma arc welding conditions.
【0052】[0052]
【表8】 [Table 8]
【0053】なお、各実施例において、いずれの場合
も、安定して溶接を行うことができ、溶接欠陥は認めら
れなかった。In each of the examples, stable welding was possible and no welding defects were observed.
【0054】[0054]
【発明の効果】以上詳述したように、本発明によれば、
固定管を高速、高能率で溶接することができる。またタ
ンクの天から地に至る溶接のような場合にも有効であ
る。As described in detail above, according to the present invention,
Fixed pipes can be welded at high speed and with high efficiency. It is also effective when welding from the top of the tank to the ground.
【図1】北半球及び南半球を説明する図である。FIG. 1 is a diagram illustrating the northern hemisphere and the southern hemisphere.
【図2】本発明の溶接手順を説明する断面図であり、A
は固定管円周の南半球部の内面溶接、(B)は北半球部の
外面溶接を示している。FIG. 2 is a sectional view for explaining the welding procedure of the present invention,
Shows the inner surface welding of the southern hemisphere around the circumference of the fixed pipe, and (B) shows the outer surface welding of the northern hemisphere.
【図3】キーホール溶接を説明する図である。FIG. 3 is a diagram illustrating keyhole welding.
【図4】実施例1での継手形状及び累層法を示す断面図
である。FIG. 4 is a cross-sectional view showing a joint shape and a formation method in Example 1.
【図5】実施例2での継手形状及び累層法を示す断面図
である。5 is a cross-sectional view showing a joint shape and a formation method in Example 2. FIG.
【図6】実施例3での継手形状及び累層法を示す断面図
である。FIG. 6 is a cross-sectional view showing a joint shape and a formation method in Example 3.
【図7】実施例4での継手形状及び累層法を示す断面図
である。FIG. 7 is a cross-sectional view showing a joint shape and a formation method in Example 4.
【図8】実施例5での継手形状及び累層法を示す断面図
である。FIG. 8 is a cross-sectional view showing a joint shape and a formation method in Example 5.
【図9】実施例6での継手形状及び累層法を示す断面図
である。FIG. 9 is a cross-sectional view showing a joint shape and a formation method in Example 6.
【図10】実施例7での継手形状及び累層法を示す断面
図である。FIG. 10 is a cross-sectional view showing a joint shape and a formation method in Example 7.
【図11】(a)、(b)は固定管の溶接におけるビー
ド継ぎ方法を説明する図である。11 (a) and 11 (b) are views explaining a bead joining method in welding of a fixed pipe.
【図12】実施例8での継手形状及び累層法を示す断面
図である。FIG. 12 is a cross-sectional view showing a joint shape and a formation method in Example 8.
Claims (7)
定管の初層溶接に当り、固定管円周の南半球部を固定管
内面側より溶接し、固定管円周の北半球部を固定管外面
側より溶接することを特徴とする固定管の溶接方法。1. In the first layer welding of a fixed pipe that is butted in a horizontal or inclined posture, the southern hemisphere portion of the circumference of the fixed pipe is welded from the inner surface of the fixed pipe, and the northern hemisphere portion of the circumference of the fixed pipe is the outer surface of the fixed pipe. A method for welding a fixed pipe, characterized by further welding.
よりの溶接を同時に行う請求項1に記載の方法。2. The method according to claim 1, wherein the welding from the inner surface side of the fixed tube and the welding from the outer surface side of the fixed tube are performed at the same time.
う請求項1又は2に記載の方法。3. The method according to claim 1, wherein the keyhole welding is performed using plasma as a heat source.
内面及び/又は外面を全姿勢溶接する請求項1、2又は
3に記載の方法。4. The method according to claim 1, 2 or 3, wherein after the initial layer welding, the inner surface and / or the outer surface of the fixed tube are welded over the entire circumference of the joint.
第1ビードと第2ビードにラップ部Lを設けて溶接を行
う請求項3又は4に記載の方法。5. In welding using a plasma arc,
The method according to claim 3, wherein the first bead and the second bead are provided with a lap portion L to perform welding.
記載の方法。6. The method according to claim 5, wherein the lap portion L is 5 mm or more.
マガス流量をそれ以外の溶接個所より常に低く抑える請
求項5又は6に記載の方法。7. The method according to claim 5, wherein the welding current and / or the plasma gas flow rate at the lap portion are always kept lower than those at other welding points.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5145682A JPH06335768A (en) | 1993-03-31 | 1993-05-25 | Method for welding fixed tube |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9717393 | 1993-03-31 | ||
JP5-97173 | 1993-03-31 | ||
JP5145682A JPH06335768A (en) | 1993-03-31 | 1993-05-25 | Method for welding fixed tube |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH06335768A true JPH06335768A (en) | 1994-12-06 |
Family
ID=26438367
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5145682A Pending JPH06335768A (en) | 1993-03-31 | 1993-05-25 | Method for welding fixed tube |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06335768A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006231359A (en) * | 2005-02-24 | 2006-09-07 | Hitachi Ltd | Welding method and structure welded by the method |
JP2007090386A (en) * | 2005-09-29 | 2007-04-12 | Hitachi Ltd | Two-sided welding process and welded structure formed thereby |
FR2959949A1 (en) * | 2010-05-12 | 2011-11-18 | Air Liquide | Performing welding according to longitudinal/circular joint plane between edges of tube to be groove welded, by preparing pass of welding between edges using electric arc welding torch, and operating progressive fusion of root face of tube |
JP2015164737A (en) * | 2014-03-03 | 2015-09-17 | 株式会社東芝 | welding method |
-
1993
- 1993-05-25 JP JP5145682A patent/JPH06335768A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006231359A (en) * | 2005-02-24 | 2006-09-07 | Hitachi Ltd | Welding method and structure welded by the method |
JP2007090386A (en) * | 2005-09-29 | 2007-04-12 | Hitachi Ltd | Two-sided welding process and welded structure formed thereby |
FR2959949A1 (en) * | 2010-05-12 | 2011-11-18 | Air Liquide | Performing welding according to longitudinal/circular joint plane between edges of tube to be groove welded, by preparing pass of welding between edges using electric arc welding torch, and operating progressive fusion of root face of tube |
JP2015164737A (en) * | 2014-03-03 | 2015-09-17 | 株式会社東芝 | welding method |
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