JP6431745B2 - Steel plate for welding backing - Google Patents
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- JP6431745B2 JP6431745B2 JP2014218113A JP2014218113A JP6431745B2 JP 6431745 B2 JP6431745 B2 JP 6431745B2 JP 2014218113 A JP2014218113 A JP 2014218113A JP 2014218113 A JP2014218113 A JP 2014218113A JP 6431745 B2 JP6431745 B2 JP 6431745B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 152
- 239000010959 steel Substances 0.000 title claims description 152
- 238000003466 welding Methods 0.000 title claims description 78
- 239000002184 metal Substances 0.000 claims description 22
- 229910052751 metal Inorganic materials 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 12
- 238000005452 bending Methods 0.000 claims description 8
- 239000010953 base metal Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 8
- 239000011295 pitch Substances 0.000 description 5
- 238000005304 joining Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Butt Welding And Welding Of Specific Article (AREA)
Description
本発明は、溶接裏当て用鋼板に関し、更に詳細には、鋼管である溶接母材の突き合わせ溶接のための、溶接母材の内寸に合わせて曲げて用いられる溶接裏当て用鋼板に関するものである。 The present invention relates to a steel plate for welding backing, and more particularly to a steel plate for welding backing used for butt welding of a welding base material that is a steel pipe and bent according to the inner dimensions of the welding base material. is there.
鉄骨建築の柱によく使用される角形鋼管は、梁との接合方法として、図７に示されるような鋼管１０２を鋼板（ダイヤフラムと呼ばれる）１０３に溶接接合し、そのダイヤフラム鋼板１０３に梁１０４を溶接接合する、いわゆる通しダイヤフラム接合形式と呼ばれる方法が多用される。この接合形式を採用する場合、柱である鋼管とダイヤフラム鋼板の溶接は一般に突き合わせ溶接が用いられ、溶接に際して裏当て金が用いられる。この裏当て金は、従来通常、フラットバーをコの字状等に曲げて作られている。
なお、上記のような溶接母材としては、角形鋼管はじめとする多角形鋼管、楕円形鋼管等が挙げられる。
As a method of joining a square steel pipe, which is often used for steel building columns, a steel pipe 102 as shown in FIG. 7 is welded to a steel plate (called a diaphragm) 103, and the beam 104 is attached to the diaphragm steel plate 103. A so-called through-diaphragm joining method for welding is often used. In the case of adopting this joining type, butt welding is generally used for welding the steel pipe as a column and the diaphragm steel plate, and a backing metal is used for welding. This backing metal is usually made by bending a flat bar into a U-shape or the like.
Examples of the welding base material as described above include polygonal steel pipes such as rectangular steel pipes, and elliptical steel pipes.
鋼管の湾曲部内面と裏当て金の間の隙間は、良好な溶接をするためにできるだけ密着させる必要がある。冷間成形角形鋼管設計・施工マニュアルで、上記隙間は１．５ｍｍ以下と規定されており、特にロボット溶接では０．５ｍｍ以下が推奨されており、上記の隙間がこの値を超えると、溶接の際に溶接欠陥が生ずる恐れがある。
角形鋼管は当然のことながら製造誤差等により、コーナー部が完全な円弧状になっておらず、このため、裏当て金の製作が難しくコスト高になり、かつ裏当て金が鋼管に対しなじみにくく、取り付けが困難であるという問題がある。
The gap between the inner surface of the curved portion of the steel pipe and the backing metal needs to be as close as possible in order to achieve good welding. In the cold-formed square steel pipe design and construction manual, the gap is specified as 1.5 mm or less, especially 0.5 mm or less is recommended for robot welding. In some cases, welding defects may occur.
As a matter of course, square steel pipes are not completely arc-shaped due to manufacturing errors, etc., which makes it difficult to manufacture the backing metal and increases the cost, and makes it difficult for the backing metal to conform to the steel pipe. There is a problem that the mounting is difficult.
このため鋼管への裏当て金の取り付け方法についていくつかの提案がなされている。たとえば、特開平４−２８４９９７号公報においては裏当て金とすべき長尺のスリット板を鋼管内周長さに合わせた円筒状の巻物に成型して切断し、これを鋼管内の取り付け位置に持ち込み、鋼管を転回しながら鋼管内壁に端から順次ローラ等で押しつけてスポット溶接で固定していく方法が示されている。しかしながら、この方法は鋼管の移送スキッドや転回装置など大がかりな設備が必要となり、適用できる場合が限られ現場作業には適さない。 For this reason, some proposals have been made on the method of attaching the backing metal to the steel pipe. For example, in Japanese Patent Application Laid-Open No. 4-284997, a long slit plate to be used as a backing metal is molded and cut into a cylindrical scroll that matches the inner circumferential length of the steel pipe, and this is placed at the mounting position in the steel pipe. A method is shown in which a steel pipe is rolled and pressed against the inner wall of the steel pipe sequentially from the end with a roller or the like and fixed by spot welding. However, this method requires large-scale equipment such as a steel pipe transfer skid and a turning device, and is applicable only to a limited number of cases.
一方、このような大がかりな設備を要さずに適用できる方法として、実開昭６３−１５７４９７号に示されるような裏当て金とすべき平鋼に切り欠き溝をあらかじめ設けておき、使用するときに鋼管の内壁に合わせて曲げるようにするものがある。 On the other hand, as a method that can be applied without requiring such large-scale equipment, a notched groove is provided in advance in a flat steel to be used as a backing metal as shown in Japanese Utility Model Publication No. 63-157497. Sometimes it is bent along the inner wall of the steel pipe.
この実開昭６３−１５７４９７号の平鋼にあらかじめ溝を設けておく方法においては、鋼管のそれぞれのコーナー部に対応する位置に一定の幅を有する角形の溝を４個ずつ設けたものが示されている。しかしながら、その実施例に示された裏当て金にあっては、溝を設けてあった部分の背面に凹みが生じ折れ線的な曲がりとなり、これらにより鋼管の内壁との間に隙間を生じ溶接不良すなわちルート部の欠陥となる。この実開昭６３−１５７４９７号には裏当て金の溝は形状、寸法、深さ、ピッチ数を適宜変化させると記載されているものの、具体的な場合に応じてどのような考え方でどのようにしたら良いのかといったことは一切示されていない。 In the method of previously providing grooves in the flat steel of Japanese Utility Model Publication No. 63-157497, four square grooves each having a certain width are provided at positions corresponding to the respective corner portions of the steel pipe. Has been. However, in the backing metal shown in the embodiment, a dent is formed on the back surface of the portion where the groove was provided, resulting in a bend in a polygonal line, thereby creating a gap between the inner wall of the steel pipe and poor welding. That is, it becomes a defect in the root portion. This Japanese Utility Model Publication No. 63-157497 describes that the groove of the backing metal is appropriately changed in shape, size, depth, and number of pitches. There is no indication of what to do.
上記のような問題に対し、特開平８−１５５６７９号においては、鋼管の内面側の曲率のバラツキがある場合でも、溶接上全く問題のない程度まで隙間を極力小さく抑えることができ、かつ加工しやすい裏当て金用の鋼板が提案され、かつ実際に使用されている。 With respect to the above problems, in Japanese Patent Laid-Open No. 8-155679, even when there is variation in the curvature of the inner surface of the steel pipe, the gap can be kept as small as possible to the extent that there is no problem in welding, and processing is performed. Steel plates for easy backing metal have been proposed and used in practice.
この特開平８−１５５６７９号の鋼管の溶接裏当て用鋼板は、鋼管の突き合わせ溶接のための真直な状態で提供され鋼管の内寸に合わせて曲げて用いる裏当て用鋼板において、鋼管それぞれの湾曲部内側の曲面部に当てるべき部分に一群の数が８個以上１０個以下のＶ溝の群を設け、前記Ｖ溝の深さは前記裏当て用鋼板の板厚から１．５ないし４ｍｍ引いた値とし、Ｖ溝の角度は一群のＶ溝の数をｎとしたとき９０／ｎ度以上１１０／ｎ度以下であることを特徴とする。 The steel plate for welding backing of steel pipes disclosed in Japanese Patent Application Laid-Open No. 8-155679 is provided in a straight state for butt welding of steel pipes, and used for bending the steel pipes according to the inner dimensions of the steel pipes. A group of 8 or more and 10 or less V-grooves is provided in a portion to be applied to the curved surface portion inside, and the depth of the V-groove is 1.5 to 4 mm less than the thickness of the backing steel plate. The angle of the V groove is 90 / n degrees or more and 110 / n degrees or less, where n is the number of V grooves in a group.
上記の裏当て用鋼板においては、溝群の各溝の形状が同一であるので、曲げた場合に、各溝部で均一に曲がってしまい、鋼管のコーナー部の内面にあてがったときに、図８に示したように、中央部がコーナー部の内面に接触し、その両側が鋼管の直線部から離れてしまい、是正が困難であった。 In the above steel plate for backing, since the shape of each groove of the groove group is the same, when it is bent, it bends uniformly in each groove portion and is applied to the inner surface of the corner portion of the steel pipe. As shown in Fig. 2, the center part contacts the inner surface of the corner part, and both sides thereof are separated from the straight part of the steel pipe, and correction is difficult.
そこで、本発明は、溝形状を再考することにより、曲げた鋼板（裏当て金）の全体を容易に鋼管の内面に添わせることのできる溶接裏当て用鋼板を提供することを目的とする。 Then, an object of this invention is to provide the steel plate for welding backing which can attach the whole bent steel plate (backing metal) to the inner surface of a steel pipe easily by reconsidering a groove shape.
上記課題は、下記（１）〜（１０）の構成の本発明の溶接裏当て用鋼板によって達成される。
（１）
多角形鋼管である溶接母材の突き合わせ溶接のための、真直な状態で提供され溶接母材の内寸に合わせて曲げて用いられる溶接裏当て用鋼板において、
溶接母材の各湾曲部の内曲面に当てるべき部分に、鋼板の幅方向に延びる一群の溝が、長手方向に並列に配置されて形成されており、
前記一群の溝の深さが、中央から両端部に向かって徐々に深くなっている
ことを特徴とする、鋼管の溶接裏当て用鋼板。
（２）
溝の底面が平らなものの場合、前記一群の溝の内の最も浅い溝の部分における残存板厚が２．０〜２．５ｍｍで、最も深い溝の部分における残存板厚が１．５〜２．０ｍｍである前記（１）の溶接裏当て用鋼板。
（３）
前記一群の溝の数が４以上である前記（１）〜（２）のいずれかの溶接裏当て用鋼板。
（４）
曲げられたときの形状が「Ｌ」字形、「ロ」字形、または「コ」字形である前記（１）〜（３）のいずれかの溶接裏当て用鋼板。
（５）
前記溝の形状は、鋼板の縁部における深さが中央部における深さより浅くなった円弧状または楕円弧状であり、作業者が治具を用いずに曲げることができ、かつガスシールドアーク溶接を行ったとき抜けが起こらないように構成されている前記（１）〜（４）のいずれかの溶接裏当て用鋼板。
（６）
前記一群の溝の最小残存板厚部が、鋼板の幅方向中心にあり、前記一群の溝の内の最も浅い溝の部分における最小残存板厚が１．７〜２．２ｍｍで前記一群の溝の内の最も深い溝の部分における溝形成部における最小残存板厚部が、鋼板の幅方向中心にあり、その最小残存板厚が１．２〜１．７ｍｍである前記（５）の溶接裏当て用鋼板。
（７）
最大残存板厚部が、鋼板の両縁部にある前記（５）または（６）の溶接裏当て用鋼板。
（８）
前記溝の形状が円弧状であり、その半径が５０〜２５５ｍｍである前記（５）の溶接裏当て用鋼板。
（９）
前記溝の形状の長軸が鋼板表面と平行な楕円弧状であり、その扁平率が０．７以下（０を含まず）である前記（５）の溶接裏当て用鋼板。
（１０）
前記（１）〜（９）のいずれかの溶接裏当て用鋼板を曲げて形成した溶接用裏当て金。
The said subject is achieved by the steel plate for welding backing of this invention of the structure of following (1)-( 10 ).
(1)
In a steel plate for welding backing, which is provided in a straight state for butt welding of a welded base metal that is a polygonal steel pipe, and is bent according to the inner dimensions of the welded base material,
A group of grooves extending in the width direction of the steel sheet are formed in parallel with each other in the longitudinal direction on the portion to be applied to the inner curved surface of each curved portion of the weld base material,
The depth of the grooves of the first group, characterized in that the gradually deeper toward the both end portions from the center, a steel sheet for welded backing of the steel pipe.
( 2 )
When the bottom surface of the groove is flat, the remaining plate thickness in the shallowest groove portion of the group of grooves is 2.0 to 2.5 mm, and the remaining plate thickness in the deepest groove portion is 1.5 to 2 mm. The steel plate for welding backing of (1 ), which is 0.0 mm.
( 3 )
The steel sheet for welding backing according to any one of (1) to ( 2 ), wherein the number of grooves in the group is 4 or more.
( 4 )
The steel sheet for welding backing according to any one of (1) to ( 3 ), wherein the bent shape is an “L” shape, a “B” shape, or a “U” shape.
( 5 )
The shape of the groove is an arc shape or an elliptical arc shape in which the depth at the edge of the steel plate is shallower than the depth at the center portion, and the operator can bend without using a jig, and gas shield arc welding is performed. The steel sheet for welding backing according to any one of (1) to ( 4 ), wherein the steel sheet is configured not to come off when it is performed.
( 6 )
The minimum remaining plate thickness portion of the group of grooves is at the center in the width direction of the steel plate, and the minimum remaining plate thickness in the shallowest groove portion of the group of grooves is 1.7 to 2.2 mm. ( 5 ), the minimum remaining plate thickness portion in the groove forming portion in the deepest groove portion is centered in the width direction of the steel plate, and the minimum remaining plate thickness is 1.2 to 1.7 mm. Steel plate for application.
( 7 )
( 5 ) or ( 6 ) the steel sheet for welding backing, wherein the maximum remaining thickness is at both edges of the steel sheet.
( 8 )
The steel sheet for welding backing according to ( 5 ), wherein the groove has an arc shape and a radius of 50 to 255 mm.
( 9 )
The steel sheet for welding backing according to ( 5 ), wherein the major axis of the groove shape is an elliptical arc shape parallel to the steel sheet surface, and the flatness is 0.7 or less (not including 0).
( 10 )
A welding backing metal formed by bending the welding backing steel plate of any one of (1) to ( 9 ).
本発明の溶接裏当て用鋼板においては、角形鋼管のコーナー部に相当する部分に設けられた一群の溝の内、両端部の溝の深さを他の溝の深さより深くしたので、前記コーナー部の中央部分が浅く曲げられ、このように適度に曲げた鋼板（裏当て金）を角形鋼管のコーナー部にあてがうと（図５参照）、裏当て金はコーナー部中央部が浮いた状態となるので、この部分をハンマー等でたたけば、きれいにコーナー部に沿った状態とすることができる。 In the steel sheet for welding backing of the present invention, the depth of the grooves at both ends of the group of grooves provided in the portion corresponding to the corner portion of the square steel pipe is made deeper than the depth of the other grooves. When the steel plate (backing metal) bent in this way is applied to the corner of a square steel pipe (see Fig. 5), the backing metal is in a state where the central part of the corner is floated. Therefore, if this part is struck with a hammer or the like, the state along the corner can be made clean.
また、本発明の溶接裏当て用鋼板においては、溝の底辺の形状を弧状や楕円弧状とした場合、従来の溶接裏当て用鋼板ように鋼板をまげるための溝の深さが一様であるものに比べて、より深い部分を有する溝を形成することができるので、より容易に鋼板を曲げることができる。更に、大きなアーク電流が発生する溶接開始部（鋼板の両側部の一方に相当する）の溝の深さを従来の溶接裏当て用鋼板の溝より浅くすることができ、従って残存板厚を厚くすることができ、熱容量を大きくすることができるので、溶接抜けを防止できる。すなわち、本発明の溶接裏当て用鋼板は、従来のものに比べて、より曲げやすく、しかも溶接抜けがない。 Moreover, in the steel sheet for welding backing of the present invention, when the shape of the bottom of the groove is an arc shape or an elliptical arc shape, the depth of the groove for winding the steel sheet is uniform as in the conventional steel sheet for welding backing. Since a groove having a deeper portion can be formed as compared with the case, the steel plate can be bent more easily. Further, the depth of the groove at the welding start portion (corresponding to one of both sides of the steel plate) where a large arc current is generated can be made shallower than the groove of the conventional steel sheet for welding backing, and thus the remaining plate thickness is increased. Since the heat capacity can be increased, it is possible to prevent welding from being lost. That is, the steel sheet for welding backing of the present invention is easier to bend than the conventional steel sheet, and further, there is no weld drop.
以下、添付図面を参照しつつ、本発明の実施の態様による角形鋼管の溶接裏当て用鋼板について説明する。本発明の溶接裏当て用鋼板は、角形鋼管等の多角形鋼管のいずれをも溶接母材とすることができる。以下の説明においては、溶接母材である鋼管を角形鋼管として説明する。
図１は、本発明の実施の態様による鋼管の溶接裏当て用鋼板を示す斜視図、図２は、図１の裏当て用鋼板の正面図、および図３は、図１の裏当て用鋼板を鋼管の湾曲部に沿って曲げた状態で表した正面図である。
Hereinafter, a steel plate for welding backing of a square steel pipe according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the steel sheet for welding backing of the present invention, any polygonal steel pipe such as a square steel pipe can be used as a welding base material. In the following description, a steel pipe that is a welding base material will be described as a square steel pipe.
1 is a perspective view showing a steel pipe for welding backing of a steel pipe according to an embodiment of the present invention, FIG. 2 is a front view of the steel sheet for backing of FIG. 1, and FIG. 3 is a steel sheet for backing of FIG. It is the front view which represented with the state bent along the curved part of the steel pipe.
この裏当て用鋼板１は、図１の斜視図に示すように角形鋼管のコーナー部に相当する箇所に一群の溝１０を設けたものである。裏当て用鋼板のそれぞれの溝の群の中央部間の距離と角形鋼管の隣り合う角部内面の曲面部の中央部間距離とをほぼ一致させることが好ましい。本溶接裏当て用鋼板１を曲げて形成した裏当て金は、図３に示したように溶接母材１０２に設置されて使用される。図示した例では、２箇所に溝の群があるが、４箇所に溝群を設けたものを使用して角コラム内周全部を１本の裏当て金で溶接を行うこともできる。 As shown in the perspective view of FIG. 1, the backing steel plate 1 is provided with a group of grooves 10 at locations corresponding to corner portions of a square steel pipe. It is preferable that the distance between the center portions of each group of grooves of the backing steel plate and the distance between the center portions of the curved surface portions of the inner surfaces of the adjacent corner portions of the square steel pipe are substantially matched. The backing metal formed by bending the steel plate 1 for welding backing is used by being installed on the welding base material 102 as shown in FIG. In the illustrated example, there are groove groups at two locations, but it is also possible to weld the entire inner periphery of the square column with a single backing metal using a groove group provided at four locations.
上記溝１０の側面形状は、図２によく示したように両側面が互いに平行な角形であることが好ましい。各溝１０の幅は、４ｍｍ以下、好ましくは２ｍｍ以下、特に１．７５ｍｍ以下であることが好ましい。この幅は、上記した溶接の抜けを考えると、狭ければ狭いほど望ましいが、溝の個数が多くなり加工に時間とコストがかかるようになる。なお、現在所、鋸刃の関係から下限は１．０ｍｍ程度である。 The side surface shape of the groove 10 is preferably a square shape whose both side surfaces are parallel to each other as well shown in FIG. The width of each groove 10 is 4 mm or less, preferably 2 mm or less, and particularly preferably 1.75 mm or less. This width is preferably as narrow as possible in view of the above-mentioned welding omission, but the number of grooves increases, and processing takes time and cost. Currently, the lower limit is about 1.0 mm because of the relationship of the saw blade.
本発明において溝は各群において４個以上、好ましくは１２個以下、特に８〜１０個とする。すなわち裏当て用鋼板を曲げたときに角コラム内側の曲面部に当たるべき部分の長さの範囲において４個以上１２個以下の溝を設けることが好ましい。 In the present invention, the number of grooves is 4 or more, preferably 12 or less, particularly 8 to 10 in each group. That is, it is preferable to provide 4 or more and 12 or less grooves in the range of the length of the portion that should contact the curved surface inside the square column when the backing steel plate is bent.
また、各群において溝を等間隔に配置する場合には、ピッチは２．５５ｍｍ以上とすることが好ましい。このピッチが上記の値未満であると、溝形成部における鉄残存量が足りなくなり、溶接の際に上記の抜けが生じやすくなる。なお、この上限は、ピッチが大きくなりすぎると、裏当て用鋼板の曲げた部分が実質的に円弧状にならず、多角形となってしまい、この多角形の辺と角形鋼管のコーナー部の円弧との間隙が大きくなってしまうので、この間隙が０．４ｍｍ以下となるような、ピッチとすることが望ましい。 Moreover, when arrange | positioning a groove | channel at equal intervals in each group, it is preferable that a pitch shall be 2.55 mm or more. If this pitch is less than the above value, the remaining amount of iron in the groove forming portion becomes insufficient, and the above-mentioned disconnection is likely to occur during welding. This upper limit is that if the pitch becomes too large, the bent portion of the backing steel plate is not substantially arcuate, but polygonal, and the sides of the polygon and the corners of the square steel pipe Since the gap with the arc becomes large, it is desirable to set the pitch so that the gap is 0.4 mm or less.
上記のように溝１０を角形にした場合、裏当て用鋼板を角形鋼管の角部に沿って曲げたときに、溝の両側壁同士が互いに干渉し合わないようにすることが好ましい（接触する程度であるならよい）。 When the groove 10 is square as described above, it is preferable that both side walls of the groove do not interfere with each other (contact) when the backing steel plate is bent along the corner of the square steel pipe. If it is a degree)
さらに角形鋼管の各辺の長さや曲率の誤差に対処するため、すなわち調節代として１個ないし４個の溝を追加してもよい。本考案による裏当て用鋼板は後に説明するように容易に曲げることができるので、曲げた後に角コラムの角部に合わせたとき、合わない場合には、少し曲げ戻して再度曲げ直すことが可能であるので、この調節代が特に有用である。 Further, one to four grooves may be added to deal with errors in the length and curvature of each side of the square steel pipe, that is, as an adjustment allowance. The backing steel plate according to the present invention can be bent easily as will be described later, so when it is bent and then fitted to the corner of the corner column, if it does not fit, it can be bent back and bent again. Therefore, this adjustment allowance is particularly useful.
さらに角形鋼管の各辺の長さや曲率の誤差に対処するため、すなわち調節代として１個ないし４個の溝を追加してもよい。本発明による裏当て用鋼板は後に説明するように容易に曲げることができるので、曲げた後に角コラムの角部に合わせたとき、合わない場合には、少し曲げ戻して再度曲げ直すことが可能であるので、この調節代が特に有用である。 Further, one to four grooves may be added to deal with errors in the length and curvature of each side of the square steel pipe, that is, as an adjustment allowance. The backing steel sheet according to the present invention can be bent easily as will be described later, so when it is bent and then fitted to the corner of the corner column, if it does not fit, it can be bent back and bent again. Therefore, this adjustment allowance is particularly useful.
本発明の実施の形態において、各群の溝１０の深さは、少なくとも両端の溝の深さが、中央の溝の深さより深く、すなわち、少なくとも両端の溝が設けられた部分の残存板厚がより小さくされ、鋼板が両端部で曲げやすくなっていることが好ましい。好ましくは、図２に示したように、各群における溝の深さが、中心部のものから両端部のものに向かって、徐々に深くされていることが望ましい。 In the embodiment of the present invention, the depth of the grooves 10 in each group is such that at least the depth of the grooves at both ends is deeper than the depth of the center groove, that is, the remaining plate thickness of the portion provided with at least the grooves at both ends. Is made smaller and the steel sheet is preferably easily bent at both ends. Preferably, as shown in FIG. 2, it is desirable that the depth of the groove in each group is gradually increased from the central portion toward the both end portions.
本発明の実施の形態において、各群の溝１０の深さは、少なくとも両端の溝の深さが、中央の溝の深さより深く、すなわち、少なくとも両端の溝が設けられた部分の残存板厚がより小さくされ、鋼板が両端部で曲げやすくなっていることが好ましい。好ましくは、図２に示したように、各群における溝の深さが、中心部のものから両端部のものに向かって、徐々に深くされていることが望ましい。
溝の底面が平らなものの場合、溝の深さが最も深い箇所での残存板厚が１．５〜２．０ｍｍ、溝の深さが最も浅い箇所での残存板厚が２．０〜２．５ｍｍとする。
In the embodiment of the present invention, the depth of the grooves 10 in each group is such that at least the depth of the grooves at both ends is deeper than the depth of the center groove, that is, the remaining plate thickness of the portion provided with at least the grooves at both ends. Is made smaller and the steel sheet is preferably easily bent at both ends. Preferably, as shown in FIG. 2, it is desirable that the depth of the groove in each group is gradually increased from the central portion toward the both end portions.
When the bottom surface of the groove is flat, the remaining plate thickness at the deepest groove depth is 1.5 to 2.0 mm, and the remaining plate thickness at the shallowest groove depth is 2.0 to 2 mm. .5 mm.
図３は、当該裏当て用鋼板２０の使用状態を示す平面図である。作業者は、裏当て金を鋼管１０２に取り付ける際に、裏当て用鋼板１を人力で図の様に曲げて裏当て金とし、溶接母材に取り付ける。前述のように、裏当て金を鋼管に取り付けた初期の段階では、鋼板の曲げ具合は図５に示した状態とすることがよい。 FIG. 3 is a plan view showing a usage state of the backing steel plate 20. When attaching the backing metal to the steel pipe 102, the operator bends the backing steel plate 1 manually as shown in the figure to attach it to the welded base metal. As described above, at the initial stage where the backing metal is attached to the steel pipe, the bending state of the steel plate is preferably in the state shown in FIG.
溶接裏当て用鋼板１形成された溝１０の鋼板の長手方向から見た断面形状は、図４を示した形状とすることが好ましい。 It is preferable that the cross-sectional shape seen from the longitudinal direction of the steel plate of the groove 10 formed with the welding backing steel plate 1 is the shape shown in FIG.
前記溝１０の形状（底辺形状）は、鋼板の縁部ｂにおける深さが中央部ａにおける深さより浅くなった円弧状または楕円弧状である。溝形成部における最小残存板厚部は、鋼板の幅方向中心にあることが好ましい。前記一群の溝の最小残存板厚部が、鋼板の幅方向中心にあり、前記一群の溝の内の最も浅い溝の部分における最小残存板厚が１．７〜２．２ｍｍで前記一群の溝の内の最も深い溝の部分における溝形成部における最小残存板厚部が、鋼板の幅方向中心にあり、その最小残存板厚が１．２〜１．７ｍｍであることが好ましい。最小残存板厚ａが上記の範囲未満であると、その箇所で溶接抜けが生じやすくなり、一方、上記の範囲を越えると、従来のものと比べての曲げ易さの効果が薄れる。 The shape (bottom shape) of the groove 10 is an arc shape or an elliptical arc shape in which the depth at the edge b of the steel plate is shallower than the depth at the central portion a. It is preferable that the minimum remaining plate thickness portion in the groove forming portion is at the center in the width direction of the steel plate. The minimum remaining plate thickness portion of the group of grooves is at the center in the width direction of the steel plate, and the minimum remaining plate thickness in the shallowest groove portion of the group of grooves is 1.7 to 2.2 mm. Among these, it is preferable that the minimum remaining plate thickness portion in the groove forming portion in the deepest groove portion is at the center in the width direction of the steel plate, and the minimum remaining plate thickness is 1.2 to 1.7 mm. If the minimum remaining plate thickness a is less than the above range, weld drop is likely to occur at that point, while if it exceeds the above range, the effect of ease of bending compared to the conventional one is reduced.
溝形成部における最大残存板厚は、１．８ｍｍ以上、４．１ｍｍ以下であることが好ましい。最大残存板厚が上記の範囲を越えると、従来のものと比べての曲げ易さの効果が薄れる。 The maximum remaining plate thickness in the groove forming portion is preferably 1.8 mm or more and 4.1 mm or less. If the maximum remaining plate thickness exceeds the above range, the effect of bendability as compared with the conventional one is reduced.
前記溝の形状が円弧状の場合、その半径は、５０ｍｍ〜２５５ｍｍであることが好ましい。前記溝の形状が長軸が鋼板表面と平行な楕円弧状である場合、その扁平率は、０．７以下（０（円弧）は含まず）であることが好ましい。 When the groove has an arc shape, the radius is preferably 50 mm to 255 mm. When the groove has an elliptical arc shape whose major axis is parallel to the steel plate surface, the flatness is preferably 0.7 or less (not including 0 (arc)).
本溶接用裏当て鋼板は、曲げられたときの形状、すなわち裏当て金として形成されたときの形状としては、「Ｌ」字形、「ロ」字形、または「コ」字形、円形または楕円形等が挙げられる。 The welding steel plate for welding has a “L” shape, a “B” shape, a “U” shape, a circular shape, an oval shape, etc. Is mentioned.
図６に、図１に示した溶接用裏当て鋼板１を曲げて形成した裏当て金を用いての鋼管とダイヤフラムの溶接状態を示すが、大きなアーク電流が発生する溶接初期に、溶接機からのアークが、裏当て金の熱容量の高い残存板厚が厚い部分に当てられるため、溶接抜けが防止される。 FIG. 6 shows a welded state of a steel pipe and a diaphragm using a backing metal formed by bending the welding backing steel plate 1 shown in FIG. 1. In the initial stage of welding in which a large arc current is generated, the welding machine Since the arc is applied to the portion of the backing metal having a high heat capacity and a large remaining plate thickness, it is possible to prevent welding from being lost.
１：溶接裏当て用鋼板
１０：切り欠き溝
１０２：溶接母材（角形鋼管）
１０３：溶接母材（ダイヤフラム）
１０４：梁
1: Steel plate for welding backing 10: Notch groove 102: Welding base material (square steel pipe)
103: Welding base material (diaphragm)
104: Beam
Claims (10)
溶接母材の各湾曲部の内曲面に当てるべき部分に、鋼板の幅方向に延びる一群の溝が、長手方向に並列に配置されて形成されており、
前記一群の溝の深さが、中央から両端部に向かって徐々に深くなっている
ことを特徴とする、鋼管の溶接裏当て用鋼板。 In the steel plate for welding backing used for butt welding of the welded base metal which is a polygonal steel pipe, bent according to the inner dimensions of the welded base material,
A group of grooves extending in the width direction of the steel sheet are formed in parallel with each other in the longitudinal direction on the portion to be applied to the inner curved surface of each curved portion of the weld base material,
A steel pipe for welding backing of a steel pipe, wherein the depth of the group of grooves gradually increases from the center toward both ends .
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| FR2842443B1 (en) * | 2002-07-19 | 2005-02-11 | Alfred Chocroun | METAL PLATE, ITS MANUFACTURING METHOD AND FOLDING METHOD |
| JP2010194604A (en) * | 2009-02-27 | 2010-09-09 | Tadashi Nakamura | Backing metal for welding |
| JP5520595B2 (en) * | 2009-12-28 | 2014-06-11 | 株式会社スノウチ | Backing metal for arc welding and arc welding method using the same |
| JP3163334U (en) * | 2010-07-29 | 2010-10-07 | 中村 正 | Backing metal for welding |
| JP3173743U (en) * | 2011-12-07 | 2012-02-16 | 正 中村 | Welding backing |
| JP2014231093A (en) * | 2013-05-30 | 2014-12-11 | コンドーテック株式会社 | Backing strip for weldment |
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