JP2013086113A - Seam welding method of uoe steel pipe - Google Patents

Seam welding method of uoe steel pipe Download PDF

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JP2013086113A
JP2013086113A JP2011227542A JP2011227542A JP2013086113A JP 2013086113 A JP2013086113 A JP 2013086113A JP 2011227542 A JP2011227542 A JP 2011227542A JP 2011227542 A JP2011227542 A JP 2011227542A JP 2013086113 A JP2013086113 A JP 2013086113A
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electrode
welding
arc
steel pipe
uoe steel
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JP5884155B2 (en
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Yudai Morimoto
雄大 森本
Keiji Kawai
啓治 川井
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JFE Steel Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a seam welding method capable of shortening the tab plate length and therefore improving productivity of UOE steep pipes by suppressing underfill that occurs on a side on which welding is completed when welding a seam part of the UOE steel pipe by submerge arc welding using multiple electrodes (at least three electrodes).SOLUTION: Welding is started from one of the tab plates, and after welding the seam part of a UOE steel pipe 1, the arc of a first electrode 2a is stopped at the other tab plate. Then, the arc of a second electrode 2b is stopped in the vicinity of the position where the arc of the first electrode is stopped, and further, the arc of a third electrode 2c and subsequent electrodes is stopped in the same position after the position where the arc of the first electrode is stopped is passed.

Description

本発明は、両管端部にタブ板を設けてＵＯＥ鋼管のシーム部を溶接するＵＯＥ鋼管のシーム溶接方法に関するものである。   The present invention relates to a seam welding method for a UOE steel pipe in which tab plates are provided at both pipe end portions to weld a seam portion of the UOE steel pipe.

ＵＯＥ鋼管のシーム部の溶接は、一般にサブマージアーク溶接で行なわれるが、溶接を開始する位置と終了する位置では安定した溶接が困難である。そこで図５に示すように、両管端部にタブ板を設けてＵＯＥ鋼管のシーム部を溶接する技術が実用化されている（たとえば特許文献１）。なお、図５では４個の電極を用いる例を示す。図５中の矢印Ａは溶接の進行方向を示し、溶接進行方向の先頭の電極を第１電極2a，２番目の電極を第２電極2b，３番目の電極を第３電極2c，最後尾の電極を第４電極2dとする。   Although welding of the seam part of a UOE steel pipe is generally performed by submerged arc welding, stable welding is difficult at a position where welding is started and a position where welding is completed. Therefore, as shown in FIG. 5, a technique has been put into practical use in which tab plates are provided at both pipe end portions and a seam portion of a UOE steel pipe is welded (for example, Patent Document 1). FIG. 5 shows an example in which four electrodes are used. The arrow A in FIG. 5 indicates the welding progress direction. The first electrode in the welding progress direction is the first electrode 2a, the second electrode is the second electrode 2b, the third electrode is the third electrode 2c, and the last electrode is the last electrode. The electrode is a fourth electrode 2d.

また図６は、図５に示すタブ板3bとＵＯＥ鋼管１との接合部を示す平面図である。図６に示すように、タブ板3bの開先部は、ＵＯＥ鋼管１の開先部４に一致させて接合される。なおタブ板3aも同様であるから図示を省略する。
図５に示すように、ＵＯＥ鋼管１のシーム部両端にタブ板3a，3bをそれぞれ溶接して、一方のタブ板3aから他方のタブ板3bへ電極2a〜2dを移動させることによって内面のシーム部を溶接する。次いで、ＵＯＥ鋼管１の管軸を中心にしてＵＯＥ鋼管１を180°回転させ、タブ板3a，3bの裏側の面を上方へ向ける。次に、一方のタブ板3aから他方のタブ板3bへ電極2a〜2dを移動させることによって外面のシーム部を溶接する。 6 is a plan view showing a joint portion between the tab plate 3b and the UOE steel pipe 1 shown in FIG. As shown in FIG. 6, the groove portion of the tab plate 3 b is joined so as to coincide with the groove portion 4 of the UOE steel pipe 1. Since the tab plate 3a is the same, the illustration is omitted.
As shown in FIG. 5, the tab plates 3a and 3b are welded to both ends of the seam portion of the UOE steel pipe 1, respectively, and the electrodes 2a to 2d are moved from one tab plate 3a to the other tab plate 3b. Weld the parts. Next, the UOE steel pipe 1 is rotated by 180 ° around the pipe axis of the UOE steel pipe 1, and the back side surfaces of the tab plates 3a and 3b are directed upward. Next, the seam portion on the outer surface is welded by moving the electrodes 2a to 2d from one tab plate 3a to the other tab plate 3b.

このようにしてタブ板3aから溶接を開始し、さらにタブ板3bで溶接を終了することによって、ＵＯＥ鋼管１のシーム部を安定した条件で溶接できる。そして内面と外面のシーム部の溶接が完了した後、タブ板3a，3bを除去すれば、健全なシーム部を有するＵＯＥ鋼管を得ることができる。
溶接を開始する側のタブ板3aでは、管軸方向のタブ板の長さは、溶接を開始してから各電極が安定するまでの移動距離に相当する長さであれば良い。 In this way, welding is started from the tab plate 3a, and further, the welding is terminated by the tab plate 3b, so that the seam portion of the UOE steel pipe 1 can be welded under stable conditions. And after welding of the seam part of an inner surface and an outer surface is completed, if the tab boards 3a and 3b are removed, the UOE steel pipe which has a sound seam part can be obtained.
In the tab plate 3a on the welding start side, the length of the tab plate in the tube axis direction may be a length corresponding to the moving distance from the start of welding to the stabilization of each electrode.

一方で、溶接を終了する側のタブ板3bでは、アークの停止に伴って、溶込み部に溶融メタルが充満し難くなり、溝状の溶接欠陥（いわゆる余盛不足）が開先部４に沿って発生する。そのため、溶接を終了する側のタブ板3bの長さ（以下、タブ板長さという）を余盛不足より長く設定する必要がある。
そこで、タブ板長さ400mm程度のタブ板3bを製作して使用している。しかしながら従来は、稀ではあるが400mmを超える余盛不足が生じることがあった。その場合は、タブ板3bを除去した後、余盛不足がＵＯＥ鋼管１のシーム部に部分的に残留するので、シーム部のビード表面に窪み状の欠陥が生じ、ＵＯＥ鋼管１の歩留り低下を招く。 On the other hand, in the tab plate 3b on the side where the welding is finished, as the arc is stopped, it becomes difficult for the melted portion to be filled with the molten metal, and a groove-like welding defect (so-called lack of surplus) is generated in the groove portion 4. Occur along. For this reason, it is necessary to set the length of the tab plate 3b on the side where the welding ends (hereinafter referred to as the tab plate length) to be longer than the shortage.
Therefore, the tab plate 3b having a tab plate length of about 400 mm is manufactured and used. However, in the past, there was a rare lack of surpassing over 400 mm. In that case, after the tab plate 3b is removed, the lack of surplus remains partially in the seam portion of the UOE steel pipe 1, so that a dimple-like defect occurs on the bead surface of the seam portion, and the yield of the UOE steel pipe 1 decreases. Invite.

これに対して余盛不足を抑制すれば、確実にタブ板3bの範囲内に収めることができるので、ＵＯＥ鋼管１の歩留り向上を図ることが可能となる。しかも、タブ板長さを短縮できるので、ＵＯＥ鋼管１のシーム部の溶接開始から溶接終了までの間隔を短縮でき、ひいては溶接に要する時間を短縮して、ＵＯＥ鋼管の生産性向上を図ることが可能となる。
しかし、多電極のサブマージアーク溶接でＵＯＥ鋼管のシーム部を溶接するにあたって、溶接を終了する側で生じる余盛不足を抑制する技術は未だ確立されていない。 On the other hand, if the surplus shortage is suppressed, the tab plate 3b can be surely accommodated, so that the yield of the UOE steel pipe 1 can be improved. In addition, since the tab plate length can be shortened, the interval from the start of welding to the end of welding of the seam portion of the UOE steel pipe 1 can be shortened, and thus the time required for welding can be shortened to improve the productivity of the UOE steel pipe. It becomes possible.
However, when welding the seam portion of a UOE steel pipe by multi-electrode submerged arc welding, a technique for suppressing the shortage in excess on the end of welding has not yet been established.

特開昭58-202991号公報JP 58-202991 A

本発明は、多電極（少なくとも３電極）のサブマージアーク溶接でＵＯＥ鋼管のシーム部を溶接するにあたって、溶接を終了する側で生じる余盛不足を抑制することによって、余盛不足をタブ板長さの範囲内に抑え、かつタブ板長さを短縮することが可能となり、ひいてはＵＯＥ鋼管の歩留り，生産性を向上できるシーム溶接方法を提供することを目的とする。   In the present invention, when the seam portion of a UOE steel pipe is welded by multimerged (at least 3 electrodes) submerged arc welding, the shortage is reduced by suppressing the shortage that occurs on the end of welding. It is possible to reduce the length of the tab plate and to reduce the length of the tab plate, and to provide a seam welding method capable of improving the yield and productivity of the UOE steel pipe.

発明者は、多電極のサブマージアーク溶接でＵＯＥ鋼管のシーム部を溶接するにあたって、溶接を終了する側で余盛不足が生じる原因について調査検討した。その結果、多電極のサブマージアーク溶接では、溶接進行方向の先頭の電極（すなわち第１電極）が開先部を溶解しながら進行していき、後続の第２電極が溶込み部の形状を調整した後、第３電極以降の溶融メタルの流動が進行してビードを形成するという機能をそれぞれ有することが分かった。   The inventors investigated and examined the cause of the lack of extra welding on the end of welding when welding the seam portion of the UOE steel pipe by multi-merged submerged arc welding. As a result, in multi-merged submerged arc welding, the first electrode in the welding direction (that is, the first electrode) proceeds while melting the groove, and the subsequent second electrode adjusts the shape of the penetration. After that, it has been found that each of the third and subsequent electrodes has a function of forming a bead by the flow of molten metal after the third electrode.

そして、従来のように全電極のアークを一斉に停止すると、第３電極以降による余盛形成機能が停止し、停止位置付近での単位長さあたりの溶着金属が減少する。その結果、第１電極と第２電極によって形成された溶込み部に溶融メタルが流れ込む際、溶着金属が減少した溶接終了部で余盛不足が発生する。
このようにして生じる余盛不足を抑制するためには、全電極のアークを一斉に停止せず、各電極のアークを停止する位置（以下、アーク停止位置という）を調整して、第１電極，第２電極で形成された溶込み部に溶融メタルを充満させる必要がある。 Then, when the arcs of all the electrodes are stopped all at once as in the prior art, the function of forming the surplus by the third electrode and thereafter stops, and the number of deposited metals per unit length near the stop position decreases. As a result, when the molten metal flows into the penetration portion formed by the first electrode and the second electrode, insufficient welding occurs at the welding end portion where the deposited metal is reduced.
In order to suppress the surplus build-up that occurs in this manner, the first electrode is adjusted by adjusting the position at which the arc of each electrode is stopped (hereinafter referred to as the arc stop position) without stopping all the arcs at once. It is necessary to fill the molten metal with the penetration portion formed by the second electrode.

本発明は、このような知見に基づいてなされたものである。
すなわち本発明は、両管端部にタブ板を設けてＵＯＥ鋼管の外面と内面のシーム部を少なくとも３電極のサブマージアーク溶接法で溶接するＵＯＥ鋼管のシーム溶接方法において、ＵＯＥ鋼管の外面および内面ともに、一方のタブ板から溶接を開始してＵＯＥ鋼管のシーム部を溶接した後、他方のタブ板で第１電極のアークを停止し、次に第１電極のアーク停止位置近傍で第２電極のアークを停止し、さらに第３電極以降は第１電極のアーク停止位置を通過した後にアークを停止するＵＯＥ鋼管のシーム溶接方法である。 The present invention has been made based on such knowledge.
That is, the present invention provides an outer surface and an inner surface of a UOE steel pipe in a seam welding method for a UOE steel pipe in which tab plates are provided at both pipe end portions and the seam portions of the outer surface and the inner surface of the UOE steel pipe are welded by at least three-electrode submerged arc welding. In both cases, welding is started from one tab plate and the seam portion of the UOE steel pipe is welded, then the arc of the first electrode is stopped at the other tab plate, and then the second electrode is near the arc stop position of the first electrode. This is a seam welding method for a UOE steel pipe in which the arc is stopped after passing through the arc stop position of the first electrode after the third electrode.

本発明のＵＯＥ鋼管のシーム溶接方法においては、第１電極のアーク停止位置と第３電極以降のアーク停止位置との距離が10〜50mmの範囲内であることが好ましい。   In the seam welding method of the UOE steel pipe of the present invention, it is preferable that the distance between the arc stop position of the first electrode and the arc stop position after the third electrode is in the range of 10 to 50 mm.

本発明によれば、多電極のサブマージアーク溶接でＵＯＥ鋼管のシーム部を溶接するにあたって、溶接を終了する側で生じる余盛不足を抑制することによって、余盛不足をタブ板長さの範囲内に抑え、かつタブ板長さを短縮することが可能となり、ひいてはＵＯＥ鋼管の歩留り，生産性を向上できる。   According to the present invention, when the seam portion of the UOE steel pipe is welded by multi-merged submerged arc welding, the underscore is suppressed within the range of the tab plate length by suppressing the underscore insufficient at the end of welding. And the tab plate length can be shortened, and as a result, the yield and productivity of the UOE steel pipe can be improved.

４電極でシーム部を溶接する場合の各電極と溶融メタルの配置を模式的に示す断面図である。It is sectional drawing which shows typically arrangement | positioning of each electrode and molten metal in the case of welding a seam part with 4 electrodes. 溶接を終了する際のアーク停止パターンを示す説明図である。It is explanatory drawing which shows the arc stop pattern at the time of complete | finishing welding. 図２のアーク停止パターンと余盛不足の長さとの関係を示すグラフである。It is a graph which shows the relationship between the arc stop pattern of FIG. 2, and the length of underscore. ＵＯＥ鋼管の板厚と余盛不足の長さとの関係を示すグラフである。It is a graph which shows the relationship between the plate | board thickness of a UOE steel pipe, and the length of the underscore. ＵＯＥ鋼管のシーム部を溶接する例を模式的に示す斜視図である。It is a perspective view which shows typically the example which welds the seam part of a UOE steel pipe. タブ板とＵＯＥ鋼管との接合部を模式的に示す平面図である。It is a top view which shows typically the junction part of a tab board and a UOE steel pipe.

図１は、多電極のサブマージアーク溶接でシーム部を溶接する例として、図５と同様に４電極の場合の各電極と溶融メタルの配置を模式的に示す断面図である。図１中の矢印Ａは溶接の進行方向を示す。以下、４電極のサブマージアーク溶接でシーム部を溶接する例について説明するが、本発明は４電極に限るものではなく、少なくとも３電極を用いてＵＯＥ鋼管のシーム部を溶接するサブマージアーク溶接に適用される。   FIG. 1 is a cross-sectional view schematically showing the arrangement of each electrode and molten metal in the case of four electrodes as an example of welding a seam portion by multi-merged submerged arc welding. An arrow A in FIG. 1 indicates the traveling direction of welding. Hereinafter, an example in which a seam portion is welded by submerged arc welding of four electrodes will be described, but the present invention is not limited to four electrodes, and is applied to submerged arc welding in which a seam portion of a UOE steel pipe is welded using at least three electrodes. Is done.

図１に示すように、溶接進行方向の先頭の第１電極2aは、開先部４を溶解しながら矢印Ａの方向に進行する。後続の第２電極2bは、第１電極2aで溶解された溶融メタル５で形成される溶込み部６の形状を調整する。次いで、第３電極以降の電極（すなわち第３電極2c，第４電極2d）にて、適当な余盛高さを得られるよう、溶着金属を調整し、ビード７が形成される。   As shown in FIG. 1, the first first electrode 2 a in the welding progress direction advances in the direction of arrow A while melting the groove portion 4. The subsequent second electrode 2b adjusts the shape of the penetration portion 6 formed of the molten metal 5 melted by the first electrode 2a. Next, the weld metal is adjusted so that an appropriate extra height is obtained at the third and subsequent electrodes (that is, the third electrode 2c and the fourth electrode 2d), and the beads 7 are formed.

このようにして図５に示すタブ板3aから溶接を開始し、他方のタブ板3bで溶接を終了する。その際、従来のように第１電極2a〜第４電極2dのアークを全て一斉に停止すると、第３電極2c，第４電極2dのアークが第１電極の後方で同時に停止するので、溶込み部６〜電極2dの間で単位長さあたりの溶着量が減少するため、余盛不足が発生する。この場合のタブ板3bと第１電極2a〜第４電極2dのアーク停止位置の配置（以下、アーク停止パターンという）を模式的に図２(a)に示す。   In this way, welding is started from the tab plate 3a shown in FIG. 5, and the welding is finished at the other tab plate 3b. At that time, if all the arcs of the first electrode 2a to the fourth electrode 2d are stopped all at once as in the prior art, the arcs of the third electrode 2c and the fourth electrode 2d are simultaneously stopped behind the first electrode. Since the amount of welding per unit length is reduced between the portion 6 and the electrode 2d, a shortage occurs. The arrangement of the arc stop positions of the tab plate 3b and the first electrode 2a to the fourth electrode 2d (hereinafter referred to as an arc stop pattern) in this case is schematically shown in FIG.

これに対して、図２(b)に示すように、まず第１電極2aのアークを停止した後、第２電極2b〜第４電極2dを第１電極2aのアーク停止位置と同じ位置までそれぞれ移動させてアークを停止すると、溶込み部６まで溶着金属が一定となり、余盛不足を抑制することができる。
また、図２(c)(d)に示すように、まず第１電極2aのアークを停止した後、第２電極2bを第１電極2aのアーク停止位置まで移動させてアークを停止し、さらに第３電極2c，第４電極2dは第１電極2aのアーク停止位置を通過した後にアークを停止すると、第３電極2c，第４電極2dにて溶着金属量を増加させることで、余盛不足をさらに短縮することが可能である。なお、図２(c)は第３電極2c，第４電極2dが第１電極2aのアーク停止位置を通過して10mm進行したときにそのアークを停止したアーク停止パターン、図２(d)は第３電極2c，第４電極2dが第１電極2aのアーク停止位置を通過して20mm進行したときにそのアークを停止したアーク停止パターンである。 On the other hand, as shown in FIG. 2B, after the arc of the first electrode 2a is first stopped, the second electrode 2b to the fourth electrode 2d are respectively moved to the same position as the arc stop position of the first electrode 2a. When the arc is stopped by moving the welding metal, the weld metal becomes constant up to the penetration portion 6, and insufficient overfilling can be suppressed.
Further, as shown in FIGS. 2 (c) and 2 (d), after the arc of the first electrode 2a is first stopped, the arc is stopped by moving the second electrode 2b to the arc stop position of the first electrode 2a. When the arc is stopped after the third electrode 2c and the fourth electrode 2d have passed the arc stop position of the first electrode 2a, the amount of deposited metal is increased by the third electrode 2c and the fourth electrode 2d, so that the surplus is insufficient. Can be further shortened. FIG. 2 (c) shows an arc stop pattern in which the arc is stopped when the third electrode 2c and the fourth electrode 2d travel 10 mm past the arc stop position of the first electrode 2a, and FIG. This is an arc stop pattern in which the arc is stopped when the third electrode 2c and the fourth electrode 2d travel 20 mm past the arc stop position of the first electrode 2a.

なお、図２(c)(d)に示すように、第３電極以降の電極（すなわち第３電極2c，第４電極2d）は、第１電極2aのアーク停止位置を通過した後に、同じ位置でアークを停止しても良い。
図３は、図２のアーク停止パターンと余盛不足の長さとの関係を調査した結果を示すグラフである。図３の横軸のａ〜ｄは、図２に示すアーク停止パターン(a)〜(d)に対応する。 As shown in FIGS. 2C and 2D, the electrodes after the third electrode (that is, the third electrode 2c and the fourth electrode 2d) have the same position after passing through the arc stop position of the first electrode 2a. The arc may be stopped at
FIG. 3 is a graph showing the results of investigating the relationship between the arc stop pattern of FIG. 2 and the length of underscore. The horizontal axes a to d in FIG. 3 correspond to the arc stop patterns (a) to (d) shown in FIG.

従来のアーク停止パターンａ（すなわち第１電極2a〜第４電極2dのアークを全て一斉に停止する場合）では、図３に示すように、ＵＯＥ鋼管の板厚が25.4〜28.0mmの範囲で余盛不足が240〜270mmである。そこで、タブ板長さ400mm程度のタブ板を用いて、板厚等の変化に起因して余盛不足の長さがばらついてもタブ板の範囲内に収めるようにしている。
これに対して本発明のアーク停止パターンｃ（すなわち第２電極2bのアークを第１電極2aのアーク停止位置で停止し、かつ第３電極2c，第４電極2dが第１電極2aのアーク停止位置を通過して10mm進行したときにそのアークを停止する場合）では、余盛不足が190〜230mmである。また、アーク停止パターンｄ（すなわち第２電極2bのアークを第１電極2aのアーク停止位置で停止し、かつ第３電極2c，第４電極2dが第１電極2aのアーク停止位置を通過して20mm進行したときにそのアークを停止する場合）では、余盛不足が90〜200mmである。つまり本発明のアーク停止パターンｃ，ｄでは、余盛不足を抑制できる。 In the conventional arc stop pattern a (that is, when all the arcs of the first electrode 2a to the fourth electrode 2d are stopped all at once), as shown in FIG. 3, the thickness of the UOE steel pipe is in the range of 25.4 to 28.0 mm. The underscore is 240 to 270 mm. Therefore, a tab plate having a tab plate length of about 400 mm is used so as to be within the range of the tab plate even if the length of the underscore is varied due to a change in the plate thickness or the like.
In contrast, the arc stop pattern c of the present invention (that is, the arc of the second electrode 2b is stopped at the arc stop position of the first electrode 2a, and the arc stop of the first electrode 2a is stopped by the third electrode 2c and the fourth electrode 2d). In the case of stopping the arc when traveling 10 mm past the position), the underscore is 190 to 230 mm. Further, the arc stop pattern d (that is, the arc of the second electrode 2b is stopped at the arc stop position of the first electrode 2a, and the third electrode 2c and the fourth electrode 2d pass through the arc stop position of the first electrode 2a. In the case of stopping the arc when traveling 20 mm), the underscore is 90 to 200 mm. That is, in the arc stop patterns c and d according to the present invention, it is possible to suppress the shortage.

そのため、タブ板長さ200〜300mm程度のタブ板を使用すれば、板厚等の変化に起因して余盛不足の長さがばらついてもタブ板の範囲内に収めることができるので、溶接が終了した後、タブ板を除去することによって健全なシーム部を有するＵＯＥ鋼管が得られる。よって、タブ板長さを、従来（400mm程度）と比べて、大幅に短縮できる。
つまり、余盛不足を抑制するためには、タブ板3bでまず第１電極2aのアークを停止した後、次に第２電極2bを第１電極2aのアーク停止位置まで移動させてアークを停止し、さらに第３電極以降（すなわち第３電極2c，第４電極2d）は第１電極2aのアーク停止位置を通過した後にアークを停止する必要がある。 Therefore, if a tab plate with a tab plate length of about 200 to 300 mm is used, it is possible to fit within the range of the tab plate even if the length of the underscore varies due to changes in the plate thickness, etc. After finishing, a UOE steel pipe having a sound seam portion is obtained by removing the tab plate. Therefore, the tab plate length can be greatly shortened compared with the conventional (about 400 mm).
In other words, in order to suppress the shortage, the arc of the first electrode 2a is first stopped by the tab plate 3b, and then the arc is stopped by moving the second electrode 2b to the arc stop position of the first electrode 2a. Further, after the third electrode (that is, the third electrode 2c and the fourth electrode 2d), it is necessary to stop the arc after passing through the arc stop position of the first electrode 2a.

第１電極2aのアーク停止位置と第３電極以降（すなわち第３電極2c，第４電極2d）のアーク停止位置との距離は、既に説明した通り10mm以上が好ましい。一方で、第１電極2aのアーク停止位置と第３電極以降のアーク停止位置との距離が長すぎると、タブ板3bを延長しなければならなくなる。そのため、第１電極2aのアーク停止位置と第３電極以降のアーク停止位置との距離は50mm以下が好ましい。   The distance between the arc stop position of the first electrode 2a and the arc stop positions after the third electrode (that is, the third electrode 2c and the fourth electrode 2d) is preferably 10 mm or more as already described. On the other hand, if the distance between the arc stop position of the first electrode 2a and the arc stop position after the third electrode is too long, the tab plate 3b must be extended. Therefore, the distance between the arc stop position of the first electrode 2a and the arc stop position after the third electrode is preferably 50 mm or less.

以上に説明した本発明のシーム溶接方法は、ＵＯＥ鋼管の外面および内面のシームの溶接に適用できる。そして、余盛不足を抑制できるので、余盛不足をタブ板長さの範囲内に抑え、かつタブ板長さを短縮することが可能となり、ＵＯＥ鋼管の歩留り，生産性を向上できる。   The seam welding method of the present invention described above can be applied to the seam welding of the outer surface and the inner surface of a UOE steel pipe. And since it is possible to suppress the shortage of surplus, it is possible to suppress the shortage of surplus within the range of the tab plate length and to shorten the tab plate length, thereby improving the yield and productivity of the UOE steel pipe.

図５に示すように両管端部にタブ板を設けたＵＯＥ鋼管のシーム部を４電極のサブマージアーク溶接で溶接して、余盛不足の長さを調査した。その手順を以下に説明する。
第１電極の溶接電流を1320Ａ，溶接電圧を34Ｖ、第２電極の溶接電流を1050Ａ，溶接電圧を40Ｖ、第３電極の溶接電流を880Ａ，溶接電圧を42Ｖ、第４電極の溶接電流を750Ａ，溶接電圧を42Ｖとし、溶接速度を1250mm／分とし、直径４mmの溶接ワイヤを用いて、板厚の異なるＵＯＥ鋼管の外面および内面のシーム部を溶接し、タブ板上で溶接を終了した。開先の形状は、外面側，内面側ともにＹ開先とした。アーク停止パターンは、発明例として図２(d)に示すアーク停止パターンｄを採用し、比較例として図２(a)に示すアーク停止パターンａを採用した。 As shown in FIG. 5, the seam part of the UOE steel pipe which provided the tab board in the both pipe | tube end parts was welded by the submerged arc welding of 4 electrodes, and the length of the underscore was investigated. The procedure will be described below.
First electrode welding current 1320A, welding voltage 34V, second electrode welding current 1050A, welding voltage 40V, third electrode welding current 880A, welding voltage 42V, fourth electrode welding current 750A The welding voltage was set to 42 V, the welding speed was set to 1250 mm / min, and the seam portions of the outer surface and the inner surface of the UOE steel pipes having different thicknesses were welded using a welding wire having a diameter of 4 mm, and the welding was finished on the tab plate. The shape of the groove was a Y groove on both the outer surface side and the inner surface side. As the arc stop pattern, an arc stop pattern d shown in FIG. 2 (d) was adopted as an invention example, and an arc stop pattern a shown in FIG. 2 (a) was adopted as a comparative example.

溶接が終了した後、タブ板上のビードを目視で観察し、余盛不足の長さを測定した。ＵＯＥ鋼管の板厚と余盛不足の長さとの関係を図４に示す。図４中の実線は発明例の回帰直線、破線は比較例の回帰直線を示す。
図４から明らかなように、発明例では、板厚の広い範囲にわたって、余盛不足が比較例に比べて抑制された。余盛不足を抑制する効果は、板厚25mm以上で、顕著に発揮された。 After the welding was completed, the bead on the tab plate was visually observed to measure the length of underscore. FIG. 4 shows the relationship between the thickness of the UOE steel pipe and the length of underscore. The solid line in FIG. 4 shows the regression line of the invention example, and the broken line shows the regression line of the comparative example.
As apparent from FIG. 4, in the inventive example, oversufficiency was suppressed over a wide range of plate thickness compared to the comparative example. The effect of suppressing the underscore shortage was remarkably exhibited when the plate thickness was 25 mm or more.

本発明によれば、溶接を終了する側で生じる余盛不足を抑制することによって、余盛不足をタブ板長さの範囲内に抑え、かつタブ板長さを短縮することが可能となり、ひいてはＵＯＥ鋼管の歩留り，生産性を向上できるので、産業上格段の効果を奏する。   According to the present invention, it is possible to suppress the oversufficiency within the range of the tab plate length and to reduce the tab plate length by suppressing the underscore shortage occurring at the end of welding. Since the yield and productivity of UOE steel pipes can be improved, there are significant industrial effects.

１ ＵＯＥ鋼管
2a 第１電極
2b 第２電極
2c 第３電極
2d 第４電極
3a 溶接を開始する側のタブ板
3b 溶接を終了する側のタブ板
４ 開先部
５ 溶融メタル
６ 溶込み部
７ ビード 1 UOE steel pipe
2a First electrode
2b Second electrode
2c Third electrode
2d 4th electrode
3a Tab plate on the side to start welding
3b Tab plate at the end of welding 4 Groove part 5 Molten metal 6 Penetration part 7 Bead

Claims (2)

両管端部にタブ板を設けてＵＯＥ鋼管の外面と内面のシーム部を少なくとも３電極のサブマージアーク溶接法で溶接するＵＯＥ鋼管のシーム溶接方法において、前記ＵＯＥ鋼管の外面および内面ともに、一方のタブ板から溶接を開始して前記ＵＯＥ鋼管のシーム部を溶接した後、他方のタブ板で第１電極のアークを停止し、次に該第１電極のアーク停止位置近傍で第２電極のアークを停止し、さらに第３電極以降は前記第１電極のアーク停止位置を通過した後にアークを停止することを特徴とするＵＯＥ鋼管のシーム溶接方法。   In the seam welding method for a UOE steel pipe, in which tab plates are provided at both pipe ends and the seam part between the outer surface and the inner surface of the UOE steel pipe is welded by a submerged arc welding method of at least three electrodes, both the outer surface and the inner surface of the UOE steel pipe After welding is started from the tab plate and the seam portion of the UOE steel pipe is welded, the arc of the first electrode is stopped at the other tab plate, and then the arc of the second electrode is near the arc stop position of the first electrode. And the arc is stopped after passing the arc stop position of the first electrode after the third electrode. 前記第１電極のアーク停止位置と前記第３電極以降のアーク停止位置との距離が10〜50mmの範囲内であることを特徴とする請求項１に記載のＵＯＥ鋼管のシーム溶接方法。   The seam welding method for a UOE steel pipe according to claim 1, wherein a distance between an arc stop position of the first electrode and an arc stop position after the third electrode is within a range of 10 to 50 mm.
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WO2018135505A1 (en) * 2017-01-17 2018-07-26 株式会社神戸製鋼所 Single-sided submerged arc welding method and single-sided submerged arc welding device
JP7497259B2 (en) 2020-09-08 2024-06-10 株式会社ダイヘン Welding Power System

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WO2018135505A1 (en) * 2017-01-17 2018-07-26 株式会社神戸製鋼所 Single-sided submerged arc welding method and single-sided submerged arc welding device
JP2018114555A (en) * 2017-01-17 2018-07-26 株式会社神戸製鋼所 One-face submerge arc welding method and one-face submerge arc welding device
JP7497259B2 (en) 2020-09-08 2024-06-10 株式会社ダイヘン Welding Power System

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