JPH1177299A - Method for welding metallic tube - Google Patents
Method for welding metallic tubeInfo
- Publication number
- JPH1177299A JPH1177299A JP24904497A JP24904497A JPH1177299A JP H1177299 A JPH1177299 A JP H1177299A JP 24904497 A JP24904497 A JP 24904497A JP 24904497 A JP24904497 A JP 24904497A JP H1177299 A JPH1177299 A JP H1177299A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- shielding gas
- bevel
- groove
- weld
- 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.)
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- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding Control (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、金属管の溶接方法
に係り、特に、大口径金属管の溶接作業性を高めるもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for welding metal pipes, and more particularly to a method for improving the workability of welding large-diameter metal pipes.
【０００２】[0002]
【従来の技術】圧力容器や配管等の片面溶接を行なう場
合、溶接接合部に溶接開先を形成しておき、母材を十分
に溶かし込んで、裏側にいわゆる裏波が均一に形成され
るように管理する必要がある。かかる技術に関連して、
技術例１：実開平０１−０４２７９４号、技術例２：実
開平０１−１５１９９５号、技術例３：実開平０３−１
１６２８６号が提案されている。2. Description of the Related Art When performing one-sided welding of a pressure vessel, a pipe, or the like, a welding groove is formed at a welded joint, a base material is sufficiently melted, and a so-called back wave is uniformly formed on the back side. Need to be managed. In connection with such technology,
Technical Example 1: Japanese Utility Model Application No. 01-042794, Technical Example 2: Japanese Utility Model Application No. 01-151995, Technical Example 3: Japanese Utility Model Application No. 03-1
No. 16286 has been proposed.
【０００３】これらの溶接技術にあっては、溶接開先の
底部にインサートリングを配するか、あるいはインサー
トリングに代えた突出部，リップ部を配するか等の工夫
により、溶接作業の円滑化を図るようにしている。[0003] In these welding techniques, the welding work is facilitated by arranging an insert ring at the bottom of the welding groove, or by arranging a projection or a lip instead of the insert ring. I try to plan.
【０００４】一方、図５及び図６に示すように、容器や
配管等の母材１の厚さが、数１０ｍｍ（例えば４０ｍ
ｍ）に及ぶ場合には、溶接開先２の開先角度を例えば２
０度、リップ部３の距離を例えば１０．６ｍｍとすると
ともに、リップ部３にインサートリング４を介在させ、
溶接開先２に細い溶接トーチ（例えば幅１０ｍｍのＴＩ
Ｇ溶接トーチ）５を挿入するようにして溶接が実施され
る。図６例では、例えば１９層，４１パスの溶接ビード
ｗにより溶接部６を形成するものとしている。On the other hand, as shown in FIGS. 5 and 6, the thickness of a base material 1 such as a container or a pipe is several tens mm (for example, 40 m).
m), the groove angle of the welding groove 2 is set to, for example, 2
0 degree, the distance of the lip portion 3 is, for example, 10.6 mm, and the insert ring 4 is interposed in the lip portion 3,
A thin welding torch (for example, a 10 mm wide TI
The welding is performed such that the G welding torch 5 is inserted. In the example of FIG. 6, the welded portion 6 is formed by, for example, a 19-layer, 41-pass welding bead w.
【０００５】[0005]
【発明が解決しようとする課題】しかし、母材１の厚さ
が、数１０ｍｍ以上に達するような場合であると、技術
例１ないし技術例３の技術を採用すると、溶接開先２の
形状が複雑化し、加えて、溶接部６の品質を確保するこ
とが技術的に困難であるとともに、多層，多パスである
ことに基づいて、作業性が低下し易くなる。However, if the thickness of the base material 1 reaches several tens of mm or more, the shape of the welding groove 2 can be obtained by employing the techniques of the technical examples 1 to 3. In addition, it is technically difficult to ensure the quality of the welded portion 6, and the workability is liable to be reduced due to the multi-layer and multi-pass.
【０００６】本発明は、かかる事情に鑑みてなされたも
ので、以下の目的を達成するものである。 溶接開先の形状の単純化を図ること。 溶接部の品質向上を図ること。 ガスによるシールド性を確保すること。 溶接作業性を向上させること。[0006] The present invention has been made in view of such circumstances, and achieves the following objects. Simplify the shape of the welding groove. Improve the quality of welds. Ensuring gas shielding. Improve welding workability.
【０００７】[0007]
【課題を解決するための手段】狭隘状態の溶接開先を採
用し、溶接開先に主シールドガスを供給しながらその主
シールドガス雰囲気で、層数とパス数とを等しくした溶
接ビードを複数重畳して溶接を行なう。溶接ビードの形
成時に生じる溶融池を磁気攪拌する。溶接の実施に使用
される溶接トーチの前後に撮像手段を配して、アークの
状態，電極の位置，溶接ワイヤの先端位置，溶融池の状
態，溶接ビードの形成状態を映像化して、監視しながら
溶接を実施する。溶接開先は、溶接部分の母材の厚さ
が、数１０ｍｍ以上に達するような場合では、溶接開先
の底部に、片側の幅寸法が２．５ｍｍ程度，高さ１．５
ｍｍ程度のリップ部を形成しておき、かつ溶接開先の開
口角度が４度程度に設定される。Means for Solving the Problems A plurality of welding beads having the same number of layers and the same number of passes in a main shielding gas atmosphere while supplying a main shielding gas to a welding groove by employing a narrow welding groove are used. Weld and superimpose. The molten pool formed during the formation of the weld bead is magnetically stirred. Imaging means are arranged before and after the welding torch used to perform welding, and the state of the arc, the position of the electrode, the position of the tip of the welding wire, the state of the weld pool, and the state of the formation of the weld bead are visualized and monitored. Weld while performing. When the thickness of the base material of the welded portion reaches several tens of mm or more, the width of one side is about 2.5 mm and the height is 1.5 mm at the bottom of the weld groove.
A lip portion of about mm is formed, and the opening angle of the welding groove is set to about 4 degrees.
【０００８】[0008]
【発明の実施の形態】以下、図１及び図２に基づいて、
本発明に係る金属管の溶接方法の一実施形態について説
明する。図１は、例えば厚さが４０ｍｍの母材１１に、
開口角度が４度程度の狭隘状態の溶接開先１２を形成し
て、該溶接開先１２に基づいて溶接作業を実施する場合
を示しており、この溶接作業では、溶接開先１２の底部
に、片側の幅寸法が２．５ｍｍ程度，高さ１．５ｍｍ程
度のリップ部１３が形成され、該リップ部１３の基部に
０．３ｍｍの曲面加工が施されたものが適用され、図５
例等に示したインサートリング４は省略される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.
An embodiment of a method for welding a metal pipe according to the present invention will be described. FIG. 1 shows, for example, a base material 11 having a thickness of 40 mm.
A case is shown in which a welding groove 12 having a narrow opening angle of about 4 degrees is formed and a welding operation is performed based on the welding groove 12. In this welding operation, a welding groove 12 is formed at the bottom of the welding groove 12. A lip 13 having a width of about 2.5 mm on one side and a height of about 1.5 mm is formed, and a 0.3 mm curved surface is applied to the base of the lip 13.
The insert ring 4 shown in the examples is omitted.
【０００９】そして、溶接トーチ１５は、図１に示すよ
うに、母材１１の表面と間隔を空けて配され、電極１５
ａの部分及び溶接ワイヤの部分が、溶接開先１２の必要
箇所まで挿入されるとともに、溶接開先１２の内部に
は、純アルゴンガス及びアルゴン混合ガスが主シールド
ガスとして供給されて、電極１５ａ及び溶接ワイヤの先
端を不活性ガス雰囲気に保持しながら、図２に示すよう
な溶接部１６が形成される。The welding torch 15 is disposed at a distance from the surface of the base material 11 as shown in FIG.
a and the welding wire are inserted to the required positions of the welding groove 12, and pure argon gas and an argon mixed gas are supplied as the main shielding gas into the welding groove 12, and the electrode 15a While maintaining the tip of the welding wire in an inert gas atmosphere, a welded portion 16 as shown in FIG. 2 is formed.
【００１０】該溶接部１６は、層数とパス数とを等しく
した溶接ビード１６ａを、複数重畳することにより行な
われる。溶接ビード１６ａの形成時にあっては、溶融金
属により形成される溶融池を磁気攪拌する技術が付加さ
れるとともに、溶接トーチ１５の前後に、ビデオカメラ
等の撮像手段を配し、アークの状態，電極の位置，溶接
ワイヤの先端位置，溶融池の状態，溶接ビードの形成状
態等を映像化して、遠隔場所において、監視しながら溶
接作業が実施される。The welding portion 16 is formed by superposing a plurality of welding beads 16a having the same number of layers and the same number of passes. At the time of forming the welding bead 16a, a technique of magnetically stirring a molten pool formed of a molten metal is added, and an imaging means such as a video camera is arranged before and after the welding torch 15 so that the state of the arc, The position of the electrode, the position of the tip of the welding wire, the state of the molten pool, the state of the formation of the weld bead, and the like are visualized, and the welding operation is performed while monitoring at a remote location.
【００１１】なお、溶接電流は、直流にパルス電流を重
畳したもの（例えば９０アンペアにパルス電流を重畳し
てピーク値を１４０アンペアとしたもの）等が適用され
る。As the welding current, a current obtained by superimposing a pulse current on a direct current (for example, a current obtained by superimposing a pulse current on 90 amps to have a peak value of 140 amps) or the like is applied.
【００１２】[0012]
【実施例】図１及び図２に示す溶接技術により、溶接部
１６を形成した場合の良否について検討した。 母材１１の厚さ：４０ｍｍ，溶接開先１２の開口角度：
４度，リップ部１３の溝幅：６．６ｍｍ，主シールドガ
ス：純アルゴンガス及びアルゴン混合ガス，溶接ビード
１６ａ：層数＝パス数とした場合、並びに、横向き姿勢
の溶接及び全姿勢溶接（下向き溶接を含む溶接）におい
て、ワイヤ供給量及び溶接電流の各溶接条件（初層の溶
接ビード１６ａの溶接条件）を変化させるとともに、溶
融池を磁気攪拌して形成された溶接部１６の溶接状態を
判定した。DESCRIPTION OF THE PREFERRED EMBODIMENTS The quality of a welded portion 16 formed by the welding technique shown in FIGS. 1 and 2 was examined. Thickness of base material 11: 40 mm, opening angle of welding groove 12:
4 degrees, groove width of lip 13: 6.6 mm, main shielding gas: pure argon gas and argon mixed gas, welding bead 16a: number of layers = number of passes, and welding in horizontal orientation and full-position welding ( In the welding including downward welding), the welding conditions of the welding portion 16 formed by magnetic stirring of the molten pool while changing the welding conditions of the wire supply amount and the welding current (the welding conditions of the first layer weld bead 16a) are changed. Was determined.
【００１３】図３は、溶接速度を毎分７ｃｍとした際の
横向き姿勢の溶接結果を示し、図４は、溶接速度を毎分
６ｃｍとした際の全姿勢溶接の結果を示している。図３
及び図４において、７００Ａは外径７０７．７ｍｍの配
管（金属管）、リップ３ｍｍは片側のリップ部１３の幅
寸法、「健全な裏波モード」は従来技術で説明した裏波
が均一に形成されたものを意味し、「融合不良」は溶接
が不十分な状態となっていることを意味し、「溶け込み
過剰」は溶接箇所の裏側に金属の垂れ下がりが生じるこ
とを意味している。溶接電流において、例えば「１６０
／９０」は、ピーク電流が１６０アンペア，ベース電流
が９０アンペアであることを意味している。ワイヤ送給
量において、例えば「２０／１０」は、ピーク電流時に
毎分２０ｃｍで溶接ワイヤを送り込み、かつベース電流
時に毎分１０ｃｍで溶接ワイヤを送り込むことを意味し
ている。ただし、ピーク電流及びベース電流は、例えば
１秒以内の所要間隔で間欠的に繰り返される。FIG. 3 shows the result of welding in a horizontal position when the welding speed is 7 cm / min, and FIG. 4 shows the result of welding in all positions when the welding speed is 6 cm / min. FIG.
In FIG. 4, 700A is a pipe (metal tube) having an outer diameter of 707.7 mm, lip 3 mm is the width dimension of the lip portion 13 on one side, and “healthy backwash mode” is a uniform backwash described in the related art. "Insufficient fusion" means that the welding is inadequate, and "Excessive penetration" means that the metal sags behind the weld. In the welding current, for example, “160”
/ 90 "means that the peak current is 160 amps and the base current is 90 amps. In the wire feed amount, for example, “20/10” means that the welding wire is fed at 20 cm / min at the peak current and the welding wire is fed at 10 cm / min at the base current. However, the peak current and the base current are intermittently repeated at required intervals of, for example, one second or less.
【００１４】図３に示す溶接結果をまとめると、横向き
姿勢の溶接の場合は、ワイヤ送給量が「２０／１０」な
いし「５０／３０」の範囲で溶接電流が「１００／９
０」ないし「１５０／９０」の範囲である条件、ワイヤ
送給量が「２０／１０」で溶接電流が「９０／９０」で
ある条件で適正が溶接が実施可能となる。図４に示す溶
接結果をまとめると、全姿勢溶接の場合は、ワイヤ送給
量が「２０／１０」ないし「４０／３０」の範囲で溶接
電流が「９０／９０」ないし「１２０／９０」の範囲で
ある条件、ワイヤ送給量が「２０／１０」ないし「３０
／２０」の範囲で溶接電流が「９０／８０」である条
件、ワイヤ送給量が「４０／２０」ないし「４０／３
０」の範囲で溶接電流が「１３０／９０」である条件で
適正が溶接が実施可能となる。なお、横向き姿勢及び全
姿勢溶接において、目標条件（理想的条件）を◎で示し
てある。[0014] Summarizing the welding results shown in Fig. 3, in the case of welding in the horizontal position, the welding current is "100/9" when the wire feed amount is in the range of "20/10" to "50/30".
Appropriate welding can be performed under conditions that are in the range of "0" to "150/90", and that the wire feed amount is "20/10" and the welding current is "90/90". Summarizing the welding results shown in FIG. 4, in the case of all-position welding, the welding current is “90/90” to “120/90” when the wire feed amount is in the range of “20/10” to “40/30”. And the wire feed rate is between “20/10” and “30”.
/ 20 ”, the welding current is“ 90/80 ”, and the wire feed rate is“ 40/20 ”to“ 40/3 ”.
Appropriate welding can be performed under the condition that the welding current is "130/90" in the range of "0". The target conditions (ideal conditions) in the horizontal position welding and all position welding are indicated by ◎.
【００１５】[0015]
【発明の効果】本発明に係る金属管の溶接方法によれ
ば、以下の効果を奏する。 （１） 狭隘状態の溶接開先を採用して、溶接開先の形
状の単純化を図り、かつ層数とパス数とを等しくした溶
接ビードにより、溶接部を効率的に形成することができ
る。 （２） 層数とパス数とを等しくした溶接ビードを複数
重畳して溶接部を形成するとともに、溶接開先に生じる
溶融池を磁気攪拌することにより、溶接部の品質向上を
図ることができる。 （３） 溶接ビードの１層を１パスで形成することによ
り、溶接作業性を向上させることができる。 （４） 狭隘状態の溶接開先を使用することにより、シ
ールドガスの拡散を抑制することができる。 （５） 上記により、シールドガスを例えばアルゴンガ
スのみとして、ガス供給を容易にすることができる。 （６） 溶接開先にリップ部を配して、インサートリン
グを省略することにより、溶接作業の単純化を図ること
ができる。According to the method for welding a metal pipe according to the present invention, the following effects can be obtained. (1) The shape of the welding groove is simplified by adopting a narrow welding groove, and a weld portion can be efficiently formed by a welding bead in which the number of layers and the number of passes are equal. . (2) A plurality of welding beads having the same number of layers and the same number of passes are superimposed to form a welded portion, and the quality of the welded portion can be improved by magnetically stirring the molten pool generated at the welding groove. . (3) By forming one layer of the weld bead in one pass, the welding workability can be improved. (4) By using a narrow welding groove, diffusion of the shielding gas can be suppressed. (5) As described above, the gas can be easily supplied by using only the argon gas as the shielding gas, for example. (6) The welding operation can be simplified by arranging the lip portion at the welding groove and omitting the insert ring.
【図１】 本発明に係る金属管の溶接方法の一実施形態
を示す正断面図である。FIG. 1 is a front sectional view showing one embodiment of a method for welding a metal pipe according to the present invention.
【図２】 本発明に係る金属管の溶接方法の一実施形態
を示す溶接部の正断面図である。FIG. 2 is a front sectional view of a welded portion showing one embodiment of a method for welding a metal pipe according to the present invention.
【図３】 本発明に係る金属管の溶接方法の実施例を示
す横向き溶接時におけるワイヤ送給量と溶接電流との関
係図である。FIG. 3 is a diagram showing a relationship between a wire feed amount and a welding current at the time of horizontal welding, showing an embodiment of the metal pipe welding method according to the present invention.
【図４】 本発明に係る金属管の溶接方法の実施例を示
す全姿勢溶接時におけるワイヤ送給量と溶接電流との関
係図である。FIG. 4 is a diagram showing a relationship between a wire feed amount and a welding current during all-position welding, showing an embodiment of the metal pipe welding method according to the present invention.
【図５】 金属管の溶接方法の従来技術例の実施状況を
示す正断面図である。FIG. 5 is a front sectional view showing an embodiment of a prior art example of a method for welding a metal pipe.
【図６】 金属管の溶接方法の従来技術例を示す溶接部
の正断面図である。FIG. 6 is a front sectional view of a welded portion showing a prior art example of a method for welding a metal pipe.
１１ 母材 １２ 溶接開先 １３ リップ部 １５ 溶接トーチ １５ａ 電極 １６ 溶接部 １６ａ 溶接ビード Reference Signs List 11 base material 12 welding groove 13 lip 15 welding torch 15a electrode 16 weld 16a welding bead
Claims (4)
ドガスを供給しながらその主シールドガス雰囲気で、層
数とパス数とを等しくした溶接ビード（１６ａ）を複数
重畳して溶接を行なうことを特徴とする金属管の溶接方
法。1. A method in which a plurality of welding beads (16a) having the same number of layers and the same number of passes are superimposed in a main shielding gas atmosphere while supplying a main shielding gas to a narrow welding groove (12). A method for welding a metal pipe, which is performed.
を磁気攪拌することを特徴とする請求項１記載の金属管
の溶接方法。2. The method for welding metal pipes according to claim 1, wherein the molten pool is magnetically stirred at the time of forming the weld bead.
溶接ワイヤの先端位置，溶融池の状態，溶接ビード（１
６ａ）の形成状態を映像化して、監視しながら溶接を実
施することを特徴とする請求項１または２記載の金属管
の溶接方法。3. The state of the arc, the position of the electrode (15a),
Weld wire tip position, weld pool condition, weld bead (1
The method for welding a metal pipe according to claim 1 or 2, wherein the formation state of 6a) is visualized and the welding is performed while monitoring.
０ｍｍ以上に達する場合に、溶接開先（１２）に、片側
の幅寸法が２．５ｍｍ程度，高さ１．５ｍｍ程度のリッ
プ部（１３）を形成し、かつ溶接開先の開口角度が片側
２°程度に設定されることを特徴とする請求項１、２ま
たは３記載の金属管の溶接方法。4. The thickness of a base material (11) of a welded portion is expressed by the following equation (1).
When it reaches 0 mm or more, a lip (13) having a width of about 2.5 mm on one side and a height of about 1.5 mm is formed on the welding groove (12), and the opening angle of the welding groove is one side. 4. The method according to claim 1, wherein the angle is set to about 2 [deg.].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24904497A JPH1177299A (en) | 1997-09-12 | 1997-09-12 | Method for welding metallic tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24904497A JPH1177299A (en) | 1997-09-12 | 1997-09-12 | Method for welding metallic tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1177299A true JPH1177299A (en) | 1999-03-23 |
Family
ID=17187183
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24904497A Pending JPH1177299A (en) | 1997-09-12 | 1997-09-12 | Method for welding metallic tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1177299A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006159226A (en) * | 2004-12-06 | 2006-06-22 | Hitachi Ltd | Back-bead welding method |
| JP2006192438A (en) * | 2005-01-11 | 2006-07-27 | Hitachi Ltd | Multi-layered welding method of narrow bevel joint |
| JP2006198657A (en) * | 2005-01-21 | 2006-08-03 | Hitachi Ltd | Method of multi-layer welding, and structure formed by multi-layer welding |
| CN100450691C (en) * | 2006-11-09 | 2009-01-14 | 上海锅炉厂有限公司 | Narrow-gap all position pusle automatic argon arc welding technique for dissimillar nicklel-based alloys |
| JP2017132467A (en) * | 2017-04-04 | 2017-08-03 | 日野自動車株式会社 | Method for manufacturing propeller shaft |
| US10132361B2 (en) | 2012-08-31 | 2018-11-20 | Hino Motors, Ltd. | Method for manufacturing propeller shaft |
| JP2020082121A (en) * | 2018-11-22 | 2020-06-04 | 日立造船株式会社 | Extremely-thick plate butt-welding method and extremely-thick plate butt-welding facility |
| RU2757447C1 (en) * | 2020-12-21 | 2021-10-15 | Дмитрий Борисович Фрункин | Method for welding large diameter straight-seam pipes |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5467538A (en) * | 1977-10-13 | 1979-05-31 | Kubota Ltd | Narrow groove tig welding |
| JPS5725298A (en) * | 1980-07-21 | 1982-02-10 | Hitachi Ltd | Method for tig welding of pipe |
| JPS5861965A (en) * | 1981-10-07 | 1983-04-13 | Nippon Steel Corp | Narrow groove automatic welding method in all positions |
| JPS59135871A (en) * | 1983-01-21 | 1984-08-04 | Kagome Kk | Peeling tomato |
| JPS632564A (en) * | 1986-06-20 | 1988-01-07 | Mitsubishi Heavy Ind Ltd | Monitoring method for welding condition |
| JPH04190976A (en) * | 1990-11-26 | 1992-07-09 | Ishikawajima Harima Heavy Ind Co Ltd | Magnetic stirring welding method and equipment |
| JPH07266039A (en) * | 1994-03-31 | 1995-10-17 | Nippon Steel Corp | Method for automatically welding circumference of circle of steel pipe |
| JPH09141432A (en) * | 1995-11-20 | 1997-06-03 | Hitachi Zosen Corp | Welding monitor device |
-
1997
- 1997-09-12 JP JP24904497A patent/JPH1177299A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5467538A (en) * | 1977-10-13 | 1979-05-31 | Kubota Ltd | Narrow groove tig welding |
| JPS5725298A (en) * | 1980-07-21 | 1982-02-10 | Hitachi Ltd | Method for tig welding of pipe |
| JPS5861965A (en) * | 1981-10-07 | 1983-04-13 | Nippon Steel Corp | Narrow groove automatic welding method in all positions |
| JPS59135871A (en) * | 1983-01-21 | 1984-08-04 | Kagome Kk | Peeling tomato |
| JPS632564A (en) * | 1986-06-20 | 1988-01-07 | Mitsubishi Heavy Ind Ltd | Monitoring method for welding condition |
| JPH04190976A (en) * | 1990-11-26 | 1992-07-09 | Ishikawajima Harima Heavy Ind Co Ltd | Magnetic stirring welding method and equipment |
| JPH07266039A (en) * | 1994-03-31 | 1995-10-17 | Nippon Steel Corp | Method for automatically welding circumference of circle of steel pipe |
| JPH09141432A (en) * | 1995-11-20 | 1997-06-03 | Hitachi Zosen Corp | Welding monitor device |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006159226A (en) * | 2004-12-06 | 2006-06-22 | Hitachi Ltd | Back-bead welding method |
| JP2006192438A (en) * | 2005-01-11 | 2006-07-27 | Hitachi Ltd | Multi-layered welding method of narrow bevel joint |
| JP2006198657A (en) * | 2005-01-21 | 2006-08-03 | Hitachi Ltd | Method of multi-layer welding, and structure formed by multi-layer welding |
| CN100450691C (en) * | 2006-11-09 | 2009-01-14 | 上海锅炉厂有限公司 | Narrow-gap all position pusle automatic argon arc welding technique for dissimillar nicklel-based alloys |
| US10132361B2 (en) | 2012-08-31 | 2018-11-20 | Hino Motors, Ltd. | Method for manufacturing propeller shaft |
| JP2017132467A (en) * | 2017-04-04 | 2017-08-03 | 日野自動車株式会社 | Method for manufacturing propeller shaft |
| JP2020082121A (en) * | 2018-11-22 | 2020-06-04 | 日立造船株式会社 | Extremely-thick plate butt-welding method and extremely-thick plate butt-welding facility |
| CN113165094A (en) * | 2018-11-22 | 2021-07-23 | 日立造船株式会社 | Butt welding method and butt welding equipment for extremely thick plates |
| CN113165094B (en) * | 2018-11-22 | 2023-03-10 | 日立造船株式会社 | Butt welding method and butt welding equipment for extremely thick plates |
| RU2757447C1 (en) * | 2020-12-21 | 2021-10-15 | Дмитрий Борисович Фрункин | Method for welding large diameter straight-seam pipes |
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