JP3525977B2 - Downward single-sided gas shielded arc welding method - Google Patents
Downward single-sided gas shielded arc welding methodInfo
- Publication number
- JP3525977B2 JP3525977B2 JP18709996A JP18709996A JP3525977B2 JP 3525977 B2 JP3525977 B2 JP 3525977B2 JP 18709996 A JP18709996 A JP 18709996A JP 18709996 A JP18709996 A JP 18709996A JP 3525977 B2 JP3525977 B2 JP 3525977B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- shielded arc
- welding method
- downward
- gas shielded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000003466 welding Methods 0.000 title claims description 125
- 238000000034 method Methods 0.000 title claims description 23
- 239000000463 material Substances 0.000 claims description 110
- 239000002893 slag Substances 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims 1
- 230000004907 flux Effects 0.000 claims 1
- 239000002023 wood Substances 0.000 claims 1
- 239000011324 bead Substances 0.000 description 44
- 230000000052 comparative effect Effects 0.000 description 14
- 230000004927 fusion Effects 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000010953 base metal Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Nonmetallic Welding Materials (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は超大型浮体式海洋構
造物（以下、メガフロートという）、船の甲板及び狭隘
な場所等において溶接するのに好適な下向片面ガスシー
ルドアーク溶接方法に関し、特に、作業時間を短縮する
ことができると共に、優れた裏波ビード形状を得ること
ができる下向片面ガスシールドアーク溶接方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a downward single-sided gas shielded arc welding method suitable for welding on a super-large floating structure offshore structure (hereinafter referred to as "megafloat"), a deck of a ship and a narrow space. In particular, the present invention relates to a downward single-sided gas shield arc welding method capable of shortening working time and obtaining an excellent backside bead shape.
【０００２】[0002]
【従来の技術】洋上におけるメガフロートにおいては、
一般的に、一定の面積を有する複数個のブロックを洋上
で溶接することにより、所望の面積のメガフロートを建
設している。また、船の底板等においても、洋上で溶接
されることがある。2. Description of the Related Art In an offshore megafloat,
Generally, a plurality of blocks having a certain area are welded on the sea to construct a megafloat having a desired area. Also, the bottom plate of a ship may be welded at sea.
【０００３】このような洋上での溶接に対しては、一般
的に、下向片面溶接が適用されるが、従来は、例えば、
作業者が一旦水中に潜り、作業が可能な空間において、
溶接母材の開先裏面に溶融池を支えるための固定式の消
耗性当材を接着テープ等により装着した後、開先部上面
から溶接していた。そして、溶接が終了した後、再び母
材の開先裏面の当材を取り外す作業が必要であった。Downward one-sided welding is generally applied to such offshore welding, but conventionally, for example,
In a space where the worker can once dive into the water and work,
A fixed consumable material for supporting the molten pool was attached to the groove back surface of the welding base metal with adhesive tape or the like, and then welding was performed from the upper surface of the groove portion. Then, after the welding was completed, it was necessary to again remove the base material on the groove back surface of the base material.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、このよ
うに、一旦水中に潜って当材を開先裏面に装着し、溶接
終了後に取り外す場合、狭隘な場所での作業となるた
め、装着及び取り外しの作業が困難であり、作業時間を
要すると共に、作業者の危険を伴うという問題点があ
る。However, when the material is dipped into the water and mounted on the back surface of the groove and then removed after the welding is completed, the work is performed in a narrow space. There are problems that the work is difficult, the work time is required, and the worker is in danger.
【０００５】他に、船の甲板等の溶接においても、同様
の下向片面溶接が適用されているが、底板からの甲板の
高さが例えば、１０乃至２０ｍ程度と高くなると、当材
の装着及び取り外し作業が困難になると共に、その作業
時に当材が落下すると極めて危険であるという問題点も
ある。In addition, the same downward single-sided welding is also applied to the welding of decks of ships, etc. However, when the height of the deck from the bottom plate becomes high, for example, about 10 to 20 m, this material is mounted. There is also a problem that the removal work becomes difficult and it is extremely dangerous if the material falls during the work.
【０００６】また、適切な当材が開先部の裏面に配置さ
れていないと、裏波ビードにカット又はオーバラップが
発生し、ビード形状が劣化すると共に、これにより、溶
接部の強度が低下するという問題点がある。If a suitable material is not placed on the back surface of the groove, the back bead will be cut or overlapped, and the bead shape will be deteriorated. As a result, the strength of the weld will be reduced. There is a problem of doing.
【０００７】本発明はかかる問題点に鑑みてなされたも
のであって、作業時間を短縮化し、作業時の安全性を高
めることができると共に、優れたビード形状を有する高
強度の継手を得ることができる下向片面ガスシールドア
ーク溶接方法を提供することを目的とする。The present invention has been made in view of the above problems, and can provide a high-strength joint having an excellent bead shape, which can shorten the working time and enhance the safety during working. It is an object of the present invention to provide a downward single-sided gas shielded arc welding method capable of performing the above.
【０００８】[0008]
【課題を解決するための手段】本発明に係る下向片面ガ
スシールドアーク溶接方法は、２枚の被溶接板を実質的
に水平に配置して、その開先裏面に非消耗性当材を配置
し、溶接の進行と共に前記当材を前記被溶接材裏面に沿
って摺動させる下向片面ガスシールドアーク溶接方法に
おいて、前記非消耗性当材は溶接の進行と同期させて移
動させ、前記非消耗性当材には深さが０．５乃至２．０
ｍｍの円弧又は平底面を有する凹部が形成されており、
ワイヤ全重量あたりのスラグ生成剤量が１乃至１１重量
％のフラックス入りワイヤを使用して、溶接時に生成さ
れる溶融池の溶接方向先端から２乃至１５ｍｍ後方で溶
接アークを発生させつつ溶接することを特徴とする。In the downward single-sided gas shielded arc welding method according to the present invention, two plates to be welded are arranged substantially horizontally, and a non-consumable material is provided on the groove back surface. In the downward single-sided gas shielded arc welding method, in which the non-consumable material is placed and slid along the back surface of the material to be welded as the welding proceeds, the non-consumable material is transferred in synchronization with the progress of welding.
The non-consumable material has a depth of 0.5 to 2.0.
mm has a circular arc or a recess having a flat bottom surface,
A flux-cored wire with a slag-forming agent content of 1 to 11% by weight based on the total weight of the wire is used ,
Melted 2 to 15 mm behind the welding direction tip of the molten pool
The feature is that welding is performed while generating a contact arc .
【０００９】本発明に係る他の下向き片面ガスシールド
アーク溶接方法は、２枚の被溶接板を実質的に水平に配
置して、その開先裏面に非消耗性当材を配置し、溶接の
進行と共に前記当材を前記被溶接材裏面に沿って摺動さ
せる下向片面ガスシールドアーク溶接方法において、前
記非消耗性当材は溶接の進行に先立ち間欠的に移動さ
せ、前記非消耗性当材には深さが０．５乃至２．０ｍｍ
の円弧又は平底面を有する凹部が形成されており、ワイ
ヤ全重量あたりのスラグ生成剤量が１乃至１１重量％の
フラックス入りワイヤを使用して、溶接時に生成される
溶融池の溶接方向先端から２乃至１５ｍｍ後方で溶接ア
ークを発生させつつ溶接することを特徴とする。 Another downward-facing single-sided gas shield according to the present invention
The arc welding method is to arrange two plates to be welded substantially horizontally.
Place the non-consumable material on the back side of the groove,
As this progresses, the material is slid along the back surface of the material to be welded.
In the downward single-sided gas shielded arc welding method,
The non-consumable material is moved intermittently prior to welding.
The depth of the non-consumable material is 0.5 to 2.0 mm.
A concave part having an arc or a flat bottom surface is formed.
The amount of slag-forming agent is 1 to 11% by weight based on the total weight.
Produced during welding using flux-cored wire
Weld the weld pool 2 to 15 mm behind the weld tip.
The feature is that welding is performed while generating arcs.
【００１０】前記非消耗性当材は内部水冷型の銅又は銅
合金からなるブロックであることが好ましい。また、開
先ギャップを４乃至２０ｍｍとすることが好ましい。更
に、溶接速度を５乃至１４（ｃｍ／分）とすることが望
ましい。更にまた、前記スラグ生成剤量は２乃至５重量
％であることが好ましい。更にまた、本発明方法は、例
えば、超大型浮体式海洋構造物の組立に際し洋上で溶接
するものである。 The non-consumable material is an internal water-cooled copper or copper
It is preferably a block made of an alloy. Also open
The tip gap is preferably 4 to 20 mm. Change
In addition, it is desirable to set the welding speed to 5 to 14 (cm / min).
Good Furthermore, the amount of the slag forming agent is 2 to 5% by weight.
% Is preferable. Furthermore, the method according to the invention is
For example, when assembling a super large floating structure offshore structure, it is welded offshore.
To do.
【００１１】[0011]
【発明の実施の形態】本発明においては、溶接の進行と
共に非消耗性当材を被溶接材裏面に沿って摺動させる。
図１（ａ）は本発明の実施例に係る下向片面ガスシール
ドアーク溶接方法を示す斜視図であり、（ｂ）はその断
面図である。板状部材（被溶接材）１及び２は若干離間
して、実質的に水平に配置されており、両者が対向する
端面には、例えば、Ｖ開先形状となる切欠き１ａ及び２
ａが形成され、これにより、開先部３が形成されてい
る。そして、開先部３の裏面には非消耗性当材４が配置
されており、当材４は溶接方向に移動させることができ
るようになっている。この非消耗性当材４は、溶接時に
変形又は融着しない材質にする必要があり、例えば、内
部水冷型の銅又は銅合金からなるブロックを使用するこ
とができる。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the non-consumable material is slid along the back surface of the material to be welded as the welding proceeds.
FIG. 1A is a perspective view showing a downward single-sided gas shielded arc welding method according to an embodiment of the present invention, and FIG. 1B is a sectional view thereof. The plate-like members (materials to be welded) 1 and 2 are arranged slightly horizontally and are arranged substantially horizontally, and the notches 1a and 2 having a V-groove shape are provided on the end faces facing each other.
a is formed, and thereby the groove portion 3 is formed. Then, a non-consumable wear material 4 is arranged on the back surface of the groove portion 3, and the wear material 4 can be moved in the welding direction. The non-consumable material 4 needs to be made of a material that does not deform or fuse during welding, and for example, a block made of internal water-cooled copper or copper alloy can be used.
【００１２】このように形成された開先部３に対して、
上方から溶接トーチ５を下向きに当て、溶接ワイヤ６の
先端にアークを発生させると共に、溶接部周辺にシール
ドガスを供給すると、当材４の上面の開先部３に溶融池
７が形成される。そして、溶接トーチ５を溶接方向に移
動させると共に、当材４を溶接方向と同一方向に摺動さ
せることにより、板状部材１と板状部材２とを溶接す
る。但し、当材４を移動させるタイミングは、溶接ワイ
ヤ６の移動に同期させて移動させる方法がある。また、
溶接方向に長尺の当材を使用する場合、溶接ワイヤの移
動に先立ち間欠的に移動させることもできる。即ち、当
材４を停止させておき、この当材４の一端から他端に向
けて溶接トーチ５を移動させて溶接を行い、溶接トーチ
５が当材４の他端に近づいたときに、当材４をその溶接
方向前方に移動させ、その後、当材４を停止させた状態
で溶接トーチ５のみを当材４の溶接方向先端付近まで移
動させて溶接する。この繰り返しにより、当材を板状部
材１及び２の裏面に沿って間欠的に移動させることとし
てもよい。With respect to the groove portion 3 thus formed,
When the welding torch 5 is applied downward from above and an arc is generated at the tip of the welding wire 6 and a shield gas is supplied to the periphery of the weld, a molten pool 7 is formed in the groove 3 on the upper surface of the base material 4. . Then, the plate-shaped member 1 and the plate-shaped member 2 are welded by moving the welding torch 5 in the welding direction and sliding the material 4 in the same direction as the welding direction. However, there is a method of moving the material 4 in synchronization with the movement of the welding wire 6. Also,
When using a long material in the welding direction, the welding wire can be moved intermittently before the movement. That is, the material 4 is stopped, the welding torch 5 is moved from one end of the material 4 to the other end to perform welding, and when the welding torch 5 approaches the other end of the material 4, The welding material 4 is moved forward in the welding direction, and then only the welding torch 5 is moved to the vicinity of the tip of the welding material 4 in the welding direction with the welding material 4 stopped. By repeating this, the material may be intermittently moved along the back surfaces of the plate members 1 and 2.
【００１３】また、本発明においては、当材４に円弧又
は平底面を有する凹部を形成し、この凹部の深さを規定
すると共に、使用する溶接ワイヤ６に含有されるスラグ
生成剤の量を適正量に規定する。Further, in the present invention, a concave portion having an arc or a flat bottom surface is formed in the base material 4, the depth of the concave portion is defined, and the amount of the slag forming agent contained in the welding wire 6 used is set. Specify an appropriate amount.
【００１４】このように、本発明においては、溶接の前
後に当材を装着したり、取り外すための作業が不要とな
るので、溶接作業時間が短縮化され、作業時の安全性を
向上させることができると共に、優れた形状の裏波ビー
ドを得ることができる。更に、開先部３の開先ギャッ
プ、溶接時の溶接アークの発生位置及び溶接速度を調整
することにより、融合不良又は当材の融着等の発生を防
止することができ、より一層優れた形状の裏波ビードを
得ることができる。As described above, according to the present invention, the work for attaching and detaching the material before and after the welding is unnecessary, so that the welding work time is shortened and the safety during the work is improved. In addition to being able to perform, it is possible to obtain a backside bead having an excellent shape. Furthermore, by adjusting the groove gap of the groove portion 3, the position where the welding arc is generated during welding, and the welding speed, it is possible to prevent the occurrence of defective fusion or fusion of the material, which is even more excellent. A shaped backside bead can be obtained.
【００１５】以下、本発明における下向片面ガスシール
ドアーク溶接方法について、更に説明する。The downward single-sided gas shielded arc welding method according to the present invention will be further described below.
【００１６】当材の凹部の深さｄ：０．５乃至２．０ｍ
ｍ
本発明においては、当材に円弧又は平底面を有する凹部
を形成すると共に、その深さｄを規定することにより、
優れた凸状の形状を有し、母材とのなじみが良好である
裏波ビードを形成する。図２は当材の形状の例を示す断
面図である。図２（ａ）及び（ｂ）に示すように、当材
１４ａ及び１４ｂは板状部材１１及び１２の間の開先ギ
ャップよりも若干広い幅で、夫々、凹部１５ａ及び１５
ｂが形成されている。当材１４ａは平底面を有する凹部
１５ａが形成されたものであり、当材１４ｂは円弧状に
凹んだ凹部１５ｂが形成されたものである。なお、本発
明において、凹部の深さｄとは、当材の母材との接触面
から、凹部の最も深い位置までの距離のことである。 Depth d of the recess of this material: 0.5 to 2.0 m
m In the present invention, by forming a concave portion having an arc or a flat bottom surface on the material and defining the depth d thereof,
It forms a backside bead having an excellent convex shape and having good compatibility with the base material. FIG. 2 is a cross-sectional view showing an example of the shape of this material. As shown in FIGS. 2A and 2B, the members 14a and 14b have a width slightly wider than the groove gap between the plate-shaped members 11 and 12, and the recesses 15a and 15 respectively.
b is formed. The material 14a is formed with a concave portion 15a having a flat bottom surface, and the material 14b is formed with a concave portion 15b concave in an arc shape. In the present invention, the depth d of the recess is the distance from the contact surface of this material with the base material to the deepest position of the recess.
【００１７】図３は当材の深さ及び溶接ワイヤ中のスラ
グ生成剤量に影響される裏波ビード形状の例を示す断面
図である。但し、図３においては、当材を省略してい
る。FIG. 3 is a sectional view showing an example of a backside bead shape which is affected by the depth of the material and the amount of the slag forming agent in the welding wire. However, in FIG. 3, this material is omitted.
【００１８】図３（ａ）に示すように、板状部材１１及
び１２の開先裏面に配置する当材の凹部の深さｄが０．
５ｍｍ未満であると、スラグ１６により溶接金属１７が
押し上げられてしまうので、裏波ビード１８ａにカット
（凹み）が発生する。一方、図３（ｂ）に示すように、
凹部の深さｄが２．０ｍｍを超えると、裏波ビード１８
ｂの突出が大きくなりすぎて、ビードの両端部のなじみ
が悪くなり、オーバラップが発生するので、継手強度が
低下する。従って、図３（ｃ）に示すように、カット及
びオーバラップが発生しない優れた形状の裏波ビード１
８ｃを得るためには、当材の凹部の深さｄを０．５乃至
２．０ｍｍとする。As shown in FIG. 3 (a), the depth d of the concave portion of the material arranged on the groove back surface of the plate-shaped members 11 and 12 is 0.
If it is less than 5 mm, the weld metal 17 is pushed up by the slag 16, so that a cut (dent) is generated in the back bead 18a. On the other hand, as shown in FIG.
If the depth d of the recess exceeds 2.0 mm, the back bead 18
Since the protrusion of b becomes too large, the both ends of the bead are not well fitted, and overlap occurs, so that the joint strength decreases. Therefore, as shown in FIG. 3 (c), the backside bead 1 having an excellent shape in which neither cutting nor overlapping occurs.
In order to obtain 8c, the depth d of the concave portion of the material is set to 0.5 to 2.0 mm.
【００１９】ワイヤ全重量あたりのスラグ生成剤量：１
乃至１１重量％、好ましくは２乃至５重量％
溶接金属の裏波ビード形状は、当材の凹部の深さのみで
なく、使用するフラックス入りワイヤに含有されるスラ
グ生成剤の含有量にも影響される。即ち、裏波ビードの
両端を母材になじませ、優れたビード形状を得るために
は、溶接時に適切な量のスラグを発生させる必要があ
る。 Amount of slag forming agent per total weight of wire: 1
To 11% by weight, preferably 2 to 5% by weight, the shape of the bead of the weld metal affects not only the depth of the concave portion of the material but also the content of the slag forming agent contained in the flux-cored wire used. To be done. That is, it is necessary to generate an appropriate amount of slag during welding in order to adapt both ends of the back bead to the base material and obtain an excellent bead shape.
【００２０】図３（ｂ）に示すように、ワイヤ全重量あ
たりのスラグ生成剤の量が１重量％未満であると、発生
するスラグの量が少ないので、裏波ビード１８ｂのなじ
みが悪くなると共に、オーバラップが発生する。一方、
図３（ａ）に示すように、ワイヤ全重量あたりのスラグ
生成剤の量が１１重量％を超えると、スラグ１６が多量
に発生するので、溶接金属１７が押し上げられて、裏波
ビード１８ａにカットが発生する。従って、図３（ｃ）
に示すように、カット及びオーバラップが発生しない優
れた形状の裏波ビード１８ｃを得るためには、フラック
ス入りワイヤに含有されるスラグ生成剤の量は１乃至１
１重量％とする。なお、好ましくは、フラックス入りワ
イヤに含有されるスラグ生成剤の量は、ワイヤ全重量あ
たり２乃至５重量％とすることが望ましい。As shown in FIG. 3 (b), if the amount of the slag-forming agent is less than 1% by weight based on the total weight of the wire, the amount of the generated slag is small and the back-bead bead 18b does not fit well. At the same time, overlap occurs. on the other hand,
As shown in FIG. 3 (a), when the amount of the slag forming agent per total weight of the wire exceeds 11% by weight, a large amount of slag 16 is generated, so that the weld metal 17 is pushed up to the backside bead 18 a. A cut occurs. Therefore, FIG.
As shown in FIG. 1, in order to obtain the back bead 18c having an excellent shape in which neither cut nor overlap occurs, the amount of the slag forming agent contained in the flux-cored wire is 1 to 1
1% by weight. It is preferable that the amount of the slag forming agent contained in the flux-cored wire is 2 to 5% by weight based on the total weight of the wire.
【００２１】開先ギャップ：４乃至２０ｍｍ
２枚の板状部材からなる母材間の開先ギャップが４ｍｍ
未満であると、裏波ビードの両端部と母材とのなじみが
悪くなって、融合不良が発生する。一方、母材間の開先
ギャップが２０ｍｍを超えると、溶融池が不安定になる
ので、裏波ビードも不安定となる。従って、母材間の開
先ギャップは４乃至２０ｍｍとすることが好ましい。 Groove gap: 4 to 20 mm Groove gap between base materials made of two plate members is 4 mm
If it is less than the above range, the both ends of the back bead and the base material become unfriendly, resulting in poor fusion. On the other hand, if the groove gap between the base materials exceeds 20 mm, the molten pool becomes unstable, and the back bead becomes unstable. Therefore, the groove gap between the base materials is preferably 4 to 20 mm.
【００２２】溶接アークの発生位置：溶融池の溶接方向
先端から２乃至１５ｍｍ後方
本発明においては、非消耗性当材を使用するので、当材
の損傷及び母材との融着を防止するために、溶接アーク
の発生位置を規定することが好ましい。溶融池７の溶接
方向先端から２ｍｍ後方の位置よりも溶接方向側（前
方）で溶接アークが発生すると、アークが直接当材４に
当たるので、当材４が損傷するか又は母材と融着してし
まう。一方、溶融池７の溶接方向先端から１５ｍｍを超
える後方の位置で溶接アークが発生すると、開先裏面へ
の熱の伝導が悪くなるので、裏波ビードの両端部と母材
とのなじみが悪くなる。従って、溶接時に生成される溶
融池７の溶接方向先端から２乃至１５ｍｍ後方で溶接ア
ークを発生させることが好ましい。 Occurrence position of welding arc: welding direction of molten pool
2 to 15 mm backward from the tip In the present invention, since the non-consumable material is used, it is preferable to define the position where the welding arc is generated in order to prevent damage to the material and fusion with the base material. When a welding arc occurs on the welding direction side (forward) with respect to the position 2 mm behind the welding direction tip of the molten pool 7, the arc directly hits the base material 4, so that the base material 4 is damaged or fused with the base material. Will end up. On the other hand, if a welding arc occurs at a position more than 15 mm behind the tip of the weld pool 7 in the welding direction, heat conduction to the back surface of the groove will be poor, and thus the fitting between both ends of the back bead and the base metal will be poor. Become. Therefore, it is preferable to generate the welding arc 2 to 15 mm behind the tip of the molten pool 7 generated during welding in the welding direction.
【００２３】溶接速度：５乃至１４（ｃｍ／分）
本発明においては、当材の母材との融着を防止すると共
に、良好な形状の裏波ビードを得るために、溶接速度を
規定することが好ましい。溶接速度が１４（ｃｍ／分）
を超えると、当材が母材に融着しやすくなる。一方、溶
接速度が５（ｃｍ／分）未満であると、裏波ビードにオ
ーバラップが発生しやすくなる。従って、溶接速度は５
乃至１４（ｃｍ／分）とすることが好ましい。 Welding speed: 5 to 14 (cm / min) In the present invention, the welding speed is regulated in order to prevent fusion of this material with the base material and to obtain a well-formed backside bead. It is preferable. Welding speed is 14 (cm / min)
If it exceeds, this material is likely to be fused to the base material. On the other hand, when the welding speed is less than 5 (cm / min), the back bead is likely to overlap. Therefore, the welding speed is 5
It is preferable to set to 14 (cm / min).
【００２４】[0024]
【実施例】以下、本発明に係る下向片面ガスシールドア
ーク溶接方法の実施例についてその比較例と比較して具
体的に説明する。EXAMPLES Examples of the downward single-sided gas shielded arc welding method according to the present invention will be specifically described below in comparison with comparative examples.
【００２５】先ず、２枚の鋼板（被溶接材）を所定の間
隔離間させて実質的に水平に配置すると共に、その開先
裏面に種々の深さの凹部を有する当材を配置し、下記表
１に示す組成を有するフラックス入りワイヤを使用して
開先部を下向片面溶接し、裏波ビード形状及び作業時間
を評価した。但し、実施例Ｎｏ．１乃至９及び比較例Ｎ
ｏ．１０乃至１４は、銅からなる当材を摺動させながら
溶接を実施したものであり、比較例Ｎｏ．１５は、当材
として従来の板状の消耗セラミック材を使用し、これを
開先裏面に取り付けた後、溶接したものである。全ての
溶接に共通する条件を下記表２に示し、その他の条件及
び評価結果を下記表３及び４に示す。First, two steel plates (materials to be welded) are arranged substantially horizontally with a predetermined distance therebetween, and a material having recesses of various depths is arranged on the back surface of the groove. Using the flux-cored wire having the composition shown in Table 1, the groove portion was welded downward on one side, and the shape of the back bead and the working time were evaluated. However, Example No. 1 to 9 and Comparative Example N
o. In Nos. 10 to 14, welding was performed while sliding the copper material, and Comparative Example No. 10 was used. Reference numeral 15 shows a conventional plate-shaped consumable ceramic material used as the material, which is attached to the groove back surface and then welded. Conditions common to all weldings are shown in Table 2 below, and other conditions and evaluation results are shown in Tables 3 and 4 below.
【００２６】[0026]
【表１】 [Table 1]
【００２７】[0027]
【表２】 [Table 2]
【００２８】[0028]
【表３】 [Table 3]
【００２９】[0029]
【表４】 [Table 4]
【００３０】上記表３及び４に示すように、実施例Ｎ
ｏ．１乃至９は、溶接の進行と共に当材を鋼板の裏面に
沿って摺動させて溶接しているので、作業時間が短縮化
された。また、ワイヤ中のスラグ生成剤の量及び当材の
凹部の深さが本発明の範囲内であるので、凹部の形状に
拘わらず、裏波ビード形状が良好なものとなった。一
方、比較例Ｎｏ．１０及び１１は、ワイヤ中のスラグ生
成剤の量が本発明範囲の上限を超えているので、裏波ビ
ードにカットが発生した。また、比較例Ｎｏ．１２は、
スラグ生成剤の量が本発明範囲の下限未満であるので、
裏波ビードの突出が大きくなってオーバラップが発生し
た。As shown in Tables 3 and 4 above, Example N
o. In Nos. 1 to 9, since this material was slid and welded along the back surface of the steel sheet as the welding progressed, the working time was shortened. Further, since the amount of the slag forming agent in the wire and the depth of the recess of the material are within the scope of the present invention, the back bead shape was good regardless of the shape of the recess. On the other hand, Comparative Example No. In Nos. 10 and 11, the amount of the slag forming agent in the wire exceeded the upper limit of the range of the present invention, so that a cut occurred in the back bead. In addition, Comparative Example No. 12 is
Since the amount of the slag generator is less than the lower limit of the range of the present invention,
The protrusion of the Uranami bead increased and an overlap occurred.
【００３１】比較例Ｎｏ．１３は、当材の凹部の深さが
本発明範囲の下限未満であるので、裏波ビードにカット
が発生した。また、比較例Ｎｏ．１４は、当材の凹部の
深さが本発明範囲の上限を超えているので、裏波ビード
の突出が大きくなってオーバラップが発生した。Comparative Example No. In No. 13, since the depth of the concave portion of this material was less than the lower limit of the range of the present invention, a cut occurred in the back bead. In addition, Comparative Example No. In No. 14, since the depth of the concave portion of the material exceeds the upper limit of the range of the present invention, the protrusion of the back bead was large and the overlap occurred.
【００３２】また、比較例Ｎｏ．１５は、当材として従
来の消耗性セラミック材を開先裏面に装着した後、溶接
を実施しているので、裏波ビード形状は良好であった
が、作業時間が長くなった。Further, in Comparative Example No. In No. 15, since a conventional consumable ceramic material was attached to the back surface of the groove and then welding was performed, the shape of the back bead was good, but the working time was long.
【００３３】次いで、溶接母材である２枚の鋼板の間隔
（開先ギャップ）を変化させ、２種の形状の当材を使用
して、実施例Ｎｏ．１乃至９と同様の方法で下向片面溶
接を実施すると共に、裏波ビード形状及び作業時間を評
価した。溶接条件及び評価結果を下記表５及び６に示
す。Then, the interval (groove gap) between the two steel plates, which are the welding base materials, was changed, and the two materials having different shapes were used. Downside one-sided welding was performed in the same manner as in 1 to 9, and the shape of the back bead and the working time were evaluated. The welding conditions and the evaluation results are shown in Tables 5 and 6 below.
【００３４】[0034]
【表５】 [Table 5]
【００３５】[0035]
【表６】 [Table 6]
【００３６】上記表５及び６に示すように、実施例Ｎ
ｏ．１６乃至１９は、開先ギャップが本発明の好ましい
範囲内であるので、当材の形状に拘わらず、裏波ビード
形状が良好なものとなった。一方、比較例Ｎｏ．２０及
び２１は、開先ギャップが本発明の好ましい範囲の下限
未満であるので、いずれの形状の当材を使用しても、裏
波ビードの両端と母材とのなじみ性が悪くなって、融合
不良が発生した。また、比較例Ｎｏ．２２及び２３は、
開先ギャップが本発明の好ましい範囲の上限を超えてい
るので、溶融池が不安定となり、裏波ビードの形状も不
安定となった。As shown in Tables 5 and 6 above, Example N
o. In Nos. 16 to 19, since the groove gap was within the preferred range of the present invention, the back bead shape was good regardless of the shape of this material. On the other hand, Comparative Example No. Nos. 20 and 21 have a groove gap less than the lower limit of the preferred range of the present invention, and therefore, no matter which shape of the material is used, the compatibility between the both ends of the back bead and the base material becomes poor, Poor fusion occurred. In addition, Comparative Example No. 22 and 23 are
Since the groove gap exceeds the upper limit of the preferred range of the present invention, the molten pool became unstable and the shape of the back bead became unstable.
【００３７】次に、溶接アークの発生位置を変化させ
て、実施例Ｎｏ．１乃至９と同様の方法で下向片面溶接
を実施すると共に、裏波ビード形状及び作業時間を評価
した。溶接条件及び評価結果を下記表７乃至９に示す。Next, by changing the position where the welding arc is generated, the number of Example No. 3 is changed. Downside one-sided welding was performed in the same manner as in 1 to 9, and the shape of the back bead and the working time were evaluated. The welding conditions and the evaluation results are shown in Tables 7 to 9 below.
【００３８】[0038]
【表７】 [Table 7]
【００３９】[0039]
【表８】 [Table 8]
【００４０】[0040]
【表９】 [Table 9]
【００４１】上記表７乃至９に示すように、実施例Ｎ
ｏ．２４乃至２６は、溶接アークの発生位置が本発明の
好ましい範囲内であるので、裏波ビード形状が良好なも
のとなった。一方、比較例Ｎｏ．２７は、溶融池の溶接
方向先端側で本発明範囲から外れて溶接アークが発生し
たので、当材が母材に融着した。また、比較例Ｎｏ．２
８及び２９は、溶融池の溶接方向の後方側で本発明範囲
から外れて溶接アークが発生したので、融合不良が発生
した。As shown in Tables 7 to 9 above, Example N
o. In Nos. 24 to 26, since the welding arc generation position was within the preferred range of the present invention, the backside bead shape was good. On the other hand, Comparative Example No. In No. 27, a welding arc was generated outside the scope of the present invention on the tip side of the weld pool in the welding direction, so that this material was fused to the base material. In addition, Comparative Example No. Two
Nos. 8 and 29 were out of the scope of the present invention on the rear side in the welding direction of the molten pool, and a welding arc was generated, so that fusion failure occurred.
【００４２】更に、溶接速度を変化させて、実施例Ｎ
ｏ．１乃至９と同様の方法で下向片面溶接を実施すると
共に、裏波ビード形状及び作業時間を評価した。溶接条
件及び評価結果を下記表１０及び１１に示す。Further, the welding speed was changed, and Example N was used.
o. Downside one-sided welding was performed in the same manner as in 1 to 9, and the shape of the back bead and the working time were evaluated. The welding conditions and the evaluation results are shown in Tables 10 and 11 below.
【００４３】[0043]
【表１０】 [Table 10]
【００４４】[0044]
【表１１】 [Table 11]
【００４５】上記表１０及び１１に示すように、実施例
Ｎｏ．３０は溶接速度が本発明の好ましい範囲内である
ので、良好な形状の裏波ビードを形成することができ
た。一方、比較例Ｎｏ．３１は溶接速度が本発明の好ま
しい範囲の上限を超えているので、当材が母材に融着し
た。また、比較例Ｎｏ．３２は溶接速度が本発明の好ま
しい範囲の下限未満であるので、裏波ビードにオーバラ
ップが発生した。As shown in Tables 10 and 11 above, Example No. Since No. 30 had a welding speed within the preferred range of the present invention, it was possible to form a backside bead having a good shape. On the other hand, Comparative Example No. Since No. 31 had a welding speed exceeding the upper limit of the preferred range of the present invention, this material was fused to the base material. In addition, Comparative Example No. In No. 32, the welding speed was less than the lower limit of the preferred range of the present invention, and therefore, the back bead was overlapped.
【００４６】本実施例においては、銅からなる当材を使
用したが、溶接時に変形又は母材との融着等が発生しな
いような当材であれば、どのような材質を使用してもよ
い。In this embodiment, the copper material is used, but any material may be used as long as it is not deformed or welded to the base material during welding. Good.
【００４７】[0047]
【発明の効果】以上詳述したように、本発明によれば、
溶接の進行と共に非消耗性当材を被溶接材裏面に沿って
摺動させて下向片面溶接を実施し、当材に所望の深さの
凹部を設けると共に、フラックス入りワイヤに含有され
るスラグ生成剤の量を規定しているので、作業時間を短
縮化することができ、作業時の安全性を向上させること
ができると共に、優れた形状の裏波ビードを得ることが
でき、これにより、継手強度を向上させることができ
る。As described in detail above, according to the present invention,
As the welding progresses, the non-consumable material is slid along the back surface of the material to be welded to perform downward one-sided welding, and a recess with a desired depth is formed in the material, and the slag contained in the flux-cored wire is also provided. Since the amount of the generating agent is specified, the working time can be shortened, the safety at the time of working can be improved, and the backside bead with an excellent shape can be obtained. The joint strength can be improved.
【００４８】更に、非消耗性当材として銅又は銅合金か
らなる水冷式当材を使用すると、当材の変形及び母材へ
の融着を防止することができる。更にまた、母材間の開
先ギャップ、溶接アークの発生位置及び溶接速度を調整
すると、より一層優れた形状の裏波ビードを得ることが
でき、当材の母材への融着等を防止することができる。Furthermore, when a water-cooled material made of copper or a copper alloy is used as the non-consumable material, it is possible to prevent the material from being deformed and fused to the base material. Furthermore, by adjusting the groove gap between the base materials, the position where the welding arc is generated, and the welding speed, it is possible to obtain a backside bead with an even better shape and prevent fusion of this material to the base material. can do.
【図１】（ａ）は本発明の実施例に係る下向片面ガスシ
ールドアーク溶接方法を示す斜視図であり、（ｂ）はそ
の断面図である。1A is a perspective view showing a downward single-sided gas shielded arc welding method according to an embodiment of the present invention, and FIG. 1B is a sectional view thereof.
【図２】当材の形状の例を示す断面図である。FIG. 2 is a cross-sectional view showing an example of the shape of this material.
【図３】当材の深さ及び溶接ワイヤ中のスラグ生成剤量
に影響される裏波ビード形状の例を示す断面図である。FIG. 3 is a cross-sectional view showing an example of a backside bead shape affected by the depth of the material and the amount of slag-forming agent in the welding wire.
１、２、１１、１２；板状部材 ３；開先部 ４、１４ａ、１４ｂ；当材 ５；溶接トーチ ６；ワイヤ ７；溶融池 １５ａ、１５ｂ；凹部 １６；スラグ １７；溶接金属 １８ａ、１８ｂ、１８ｃ；裏波ビード 1, 2, 11, 12; plate-shaped member 3; groove part 4, 14a, 14b; this material 5: Welding torch 6; wire 7; molten pool 15a, 15b; recess 16; Slag 17; Weld metal 18a, 18b, 18c; Uranami beads
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｂ６３Ｂ 9/06 １０３ Ｂ６３Ｂ 9/06 １０３ (72)発明者 今岡 進 神奈川県藤沢市宮前字裏河内100番１ 株式会社神戸製鋼所藤沢事業所内 (56)参考文献 特開 平１−104476（ＪＰ，Ａ) 特開 平１−233070（ＪＰ，Ａ) 特開 平７−276088（ＪＰ，Ａ) 実開 昭58−170191（ＪＰ，Ｕ) 実開 昭56−122569（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B23K 9/035 B23K 9/173 Continuation of front page (51) Int.Cl. 7 Identification code FI B63B 9/06 103 B63B 9/06 103 (72) Inventor Susumu Imaoka 100-1 Urakawachi, Miyamae, Fujisawa-shi, Kanagawa Kobe Steel, Ltd. Fujisawa Project In-house (56) Reference JP-A-1-104476 (JP, A) JP-A-1-233070 (JP, A) JP-A-7-276088 (JP, A) Actual development Sho-58-170191 (JP, U) Actual Development Sho 56-122569 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) B23K 9/035 B23K 9/173
Claims (7)
て、その開先裏面に非消耗性当材を配置し、溶接の進行
と共に前記当材を前記被溶接材裏面に沿って摺動させる
下向片面ガスシールドアーク溶接方法において、前記非
消耗性当材は溶接の進行と同期させて移動させ、前記非
消耗性当材には深さが０．５乃至２．０ｍｍの円弧又は
平底面を有する凹部が形成されており、ワイヤ全重量あ
たりのスラグ生成剤量が１乃至１１重量％のフラックス
入りワイヤを使用して、溶接時に生成される溶融池の溶
接方向先端から２乃至１５ｍｍ後方で溶接アークを発生
させつつ溶接することを特徴とする下向片面ガスシール
ドアーク溶接方法。1. A two plates to be welded are arranged substantially horizontally, a non-consumable material is arranged on the groove back surface, and the material is placed along the back surface of the material to be welded as welding progresses. in downward sided gas shielded arc welding method sliding Te, the non
The consumable material is moved in synchronism with the progress of welding, and the non-consumable material is formed with a recess having an arc or a flat bottom surface with a depth of 0.5 to 2.0 mm. and slag forming agent amount per will use 1 to 11 wt% of the flux cored wire, soluble in molten pool generated during welding
Welding arc is generated 2 to 15 mm behind the contact tip
A downward-facing single-sided gas shielded arc welding method characterized by performing welding while performing the welding.
て、その開先裏面に非消耗性当材を配置し、溶接の進行
と共に前記当材を前記被溶接材裏面に沿って摺動させる
下向片面ガスシールドアーク溶接方法において、前記非
消耗性当材は溶接の進行に先立ち間欠的に移動させ、前
記非消耗性当材には深さが０．５乃至２．０ｍｍの円弧
又は平底面を有する凹部が形成されており、ワイヤ全重
量あたりのスラグ生成剤量が１乃至１１重量％のフラッ
クス入りワイヤを使用して、溶接時に生成される溶融池
の溶接方向先端から２乃至１５ｍｍ後方で溶接アークを
発生させつつ溶接することを特徴とする下向片面ガスシ
ールドアーク溶接方法。2. The two plates to be welded are arranged substantially horizontally, the non-consumable material is arranged on the groove back surface, and the material is along the back surface of the material to be welded as the welding progresses. in downward sided gas shielded arc welding method sliding Te, the non
The consumable material is intermittently moved prior to the progress of welding, and the non-consumable material is formed with a recess having an arc or a flat bottom surface with a depth of 0.5 to 2.0 mm. Molten pool produced during welding using flux-cored wire with an amount of slag generator of 1 to 11% by weight.
The welding arc 2 to 15 mm behind the tip of the welding direction
A downward single-sided gas shielded arc welding method characterized by performing welding while generating .
銅合金からなるブロックであることを特徴とする請求項
１又は２に記載の下向片面ガスシールドアーク溶接方
法。Wherein the non-consumable those wood is downward sided gas shielded arc welding method according to claim 1 or 2, characterized in that a block consisting of internal water cooling type copper or a copper alloy.
とを特徴とする請求項１乃至３のいずれか１項に記載の
下向片面ガスシールドアーク溶接方法。4. A downstream one side gas-shielded arc welding method according to any one of claims 1 to 3, characterized in that a 4 to 20mm the groove gap.
ることを特徴とする請求項１乃至４のいずれか１項に記
載の下向片面ガスシールドアーク溶接方法。5. The downstream sided gas shielded arc welding method according to any one of claims 1 to 4, characterized in that the welding speed for 5 to 14 (cm / min).
あることを特徴とする請求項１乃至５のいずれか１項に
記載の下向片面ガスシールドアーク溶接方法。6. A downstream one side gas-shielded arc welding method according to any one of claims 1 to 5, wherein the slag forming agent amount is 2 to 5 wt%.
上で溶接することを特徴とする請求項１乃至６のいずれ
か１項に記載の下向片面ガスシールドアーク溶接方法。 7. When assembling a super-large floating structure offshore structure
7. The welding according to claim 1, wherein the welding is performed above.
The downward single-sided gas shielded arc welding method according to Item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18709996A JP3525977B2 (en) | 1996-07-17 | 1996-07-17 | Downward single-sided gas shielded arc welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18709996A JP3525977B2 (en) | 1996-07-17 | 1996-07-17 | Downward single-sided gas shielded arc welding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1029091A JPH1029091A (en) | 1998-02-03 |
| JP3525977B2 true JP3525977B2 (en) | 2004-05-10 |
Family
ID=16200094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18709996A Expired - Fee Related JP3525977B2 (en) | 1996-07-17 | 1996-07-17 | Downward single-sided gas shielded arc welding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3525977B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3867712B2 (en) | 2004-04-20 | 2007-01-10 | 松下電器産業株式会社 | Consumable electrode arc welding method |
| JP5152602B2 (en) * | 2010-07-30 | 2013-02-27 | 三菱重工鉄構エンジニアリング株式会社 | Welding method and welding apparatus |
| JP6190774B2 (en) * | 2014-07-25 | 2017-08-30 | 株式会社神戸製鋼所 | Electrogas arc welding method and electrogas arc welding apparatus |
| CN104259624B (en) * | 2014-09-01 | 2016-06-08 | 湖北源盛钢构有限公司 | The moulding process of unclear of plate of moderate thickness docking completepenetration I level component |
| CN109676219A (en) * | 2018-12-30 | 2019-04-26 | 重庆欣雨压力容器制造有限责任公司 | A kind of CO2The welding method of ceramic backing single face welding and double face shaping |
| WO2022196541A1 (en) * | 2021-03-18 | 2022-09-22 | Ｊｆｅスチール株式会社 | Gas-shielded arc welding method, welded joint, and welded-joint production method |
| CN115178830A (en) * | 2022-06-24 | 2022-10-14 | 广船国际有限公司 | Welding method for carrying outboard plate on board side |
-
1996
- 1996-07-17 JP JP18709996A patent/JP3525977B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1029091A (en) | 1998-02-03 |
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