JPH10216943A - Gas shielded metal arc welding method of small leg length high-speed horizontal fillet type - Google Patents
Gas shielded metal arc welding method of small leg length high-speed horizontal fillet typeInfo
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- JPH10216943A JPH10216943A JP3695797A JP3695797A JPH10216943A JP H10216943 A JPH10216943 A JP H10216943A JP 3695797 A JP3695797 A JP 3695797A JP 3695797 A JP3695797 A JP 3695797A JP H10216943 A JPH10216943 A JP H10216943A
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- Prior art keywords
- electrode
- wire
- welding
- leg length
- flux
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は造船や橋梁等の分野
で多用されている水平すみ肉溶接に適用して、溶接欠陥
がなく、形状も良好な小脚長ビードが高能率で得られる
小脚長高速水平すみ肉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 is applied to horizontal fillet welding, which is widely used in fields such as shipbuilding and bridges, and has a small leg length having a good shape without a welding defect and having a good shape. The present invention relates to a high speed horizontal fillet gas shielded arc welding method.
【０００２】[0002]
【従来の技術】近年、各種溶接構造物の建造において、
溶接能率向上のためにフラックス入りワイヤを用いたガ
スシールドアーク溶接法の適用が増大している。特に全
溶接長に占める水平すみ肉溶接の比率が高い造船や橋梁
等の分野では、これの高能率化が最大の課題となってい
る。これに対し、特開昭６３−２３５０７７号公報、特
開平２−２８０９６８号公報等により２電極１プール方
式の高速水平すみ肉ガスシールドアーク溶接方法が提案
され、各所で実用化が進んでいる。なお、前者は先行電
極にスラグ形成剤をほとんど含有しない金属粉主体のメ
タルコアドワイヤを、後行電極にＴｉＯ2 を主体とする
スラグ形成剤を含有するルチール系フラックス入りワイ
ヤを用いることを特徴とし、後者は２電極ともルチール
系フラックス入りワイヤを用いることを特徴としてい
る。これらは脚長５〜６ｍｍの水平すみ肉溶接の高速化
には最適な溶接方法である。2. Description of the Related Art In recent years, in the construction of various welded structures,
The application of the gas shielded arc welding method using a flux-cored wire to improve welding efficiency is increasing. In particular, in fields such as shipbuilding and bridges where the ratio of horizontal fillet welding to the total welding length is high, increasing the efficiency is the biggest issue. On the other hand, a high-speed horizontal fillet gas shielded arc welding method using a two-electrode, one-pool system has been proposed in Japanese Patent Application Laid-Open Nos. 63-235077 and 2-280968, etc., and practical use is progressing in various places. The former is characterized by using a metal cored wire mainly composed of metal powder containing almost no slag forming agent in the leading electrode, and using a rutile flux cored wire containing a slag forming agent mainly composed of TiO 2 in the succeeding electrode. The latter is characterized in that a rutile flux-cored wire is used for both electrodes. These are optimal welding methods for speeding up horizontal fillet welding with leg lengths of 5 to 6 mm.
【０００３】しかるに最近、特に造船分野においては溶
接構造物の溶接歪みによる変形防止対策及び溶接材料コ
スト低減のために、水平すみ肉ビードの小脚長化要望
（脚長５ｍｍ未満）が強い。従来の２電極１プール方式
による高速すみ肉溶接の問題点は、脚長が小さくなるに
つれて溶接部にコーナー部の溶込み不足やスラグ巻き込
みの溶接欠陥が発生しやすくなることにあり、これらの
補修は溶接能率を著しく低下させる。さらに、ビード形
状についても、小脚長化にともないオーバーラップ気味
になりやすく、塗装性の面から改善要望が強い。However, recently, particularly in the field of shipbuilding, there is a strong demand for a leg of a horizontal fillet bead to have a small leg length (less than 5 mm) in order to prevent deformation due to welding distortion of a welded structure and to reduce welding material costs. The problem of the high-speed fillet welding by the conventional two-electrode one-pool method is that as the leg length becomes smaller, insufficient penetration of corners and welding defects such as slag entrainment are likely to occur in the welded portion. Significantly reduces welding efficiency. In addition, the bead shape tends to overlap as the leg length increases, and there is a strong demand for improvement in terms of paintability.
【０００４】[0004]
【発明が解決しようとする課題】そこで、本発明は、２
電極１プール方式の水平すみ肉溶接において、溶接構造
物の歪みを低減するために小脚長化（目標脚長３〜４ｍ
ｍ、即ち立板側、下板側の脚長とも５．０ｍｍ未満）に
した場合でも、上記のような溶接欠陥がなく、良好なビ
ード形状が得られる小脚長高速水平すみ肉ガスシールド
アーク溶接方法を提供することを目的とする。Therefore, the present invention relates to
In the horizontal fillet welding of the electrode 1 pool method, the length of the small leg is reduced in order to reduce the distortion of the welded structure (the target leg length is 3 to 4 m).
m, that is, both the leg length on the standing plate side and the leg length on the lower plate side are less than 5.0 mm), a small leg length high-speed horizontal fillet gas shielded arc welding method that can obtain a good bead shape without the above welding defects. The purpose is to provide.
【０００５】[0005]
【課題を解決するための手段】本発明の要旨は、フラッ
クス入りワイヤを用いて行う２電極１プール方式の水平
すみ肉ガスシールドアーク溶接方法において、先行電極
のワイヤ突き出し長さ（ＷＬ1 ）が後行電極の突き出し
長さ（ＷＬ2 ）に対し、下式（１）を満足し、かつ、少
なくとも後行電極はルチール系フラックス入りワイヤと
し、溶接速度１．０ｍ／ｍｉｎ以上で脚長３〜４ｍｍビ
ードを形成し、溶接欠陥が少なく良好なビード形状が得
られることを特徴とする小脚長高速水平すみ肉ガスシー
ルドアーク溶接方法を要旨としている。 （ＷＬ1 ＋５ｍｍ）＜ＷＬ2 ≦４５ｍｍ ・・・・・（１） 但し、ＷＬ1 ＝１５〜２５ｍｍThe gist of the present invention is to provide a two-electrode, one-pool horizontal fillet gas shielded arc welding method using a flux-cored wire, in which the protruding length (WL 1 ) of the leading electrode is reduced. The following formula (1) is satisfied with respect to the protruding length (WL 2 ) of the trailing electrode, and at least the trailing electrode is a rutile flux-cored wire, and a leg length of 3 to 4 mm at a welding speed of 1.0 m / min or more. The gist of the present invention is to provide a small leg length high speed horizontal fillet gas shielded arc welding method characterized by forming a bead and obtaining a good bead shape with few welding defects. (WL 1 +5 mm) <WL 2 ≦ 45 mm (1) where WL 1 = 15 to 25 mm
【０００６】また、他の本発明は、上記ワイヤ成分が金
属弗化物を０．０３％〜０．５０％含有するルチール系
フラックス入りワイヤを少なくとも後行電極に用いるこ
と。及び鋼製外皮中にフラックスをワイヤ重量当たり８
〜２５％充填してなるフラックス入りワイヤを用いるこ
と。さらに先行電極のワイヤ先端狙い位置はコーナー
部、あるいはコーナー部を基点とし下板側２ｍｍ以内、
立板側１ｍｍ以下とし、この時の電極角度は下板から４
０〜６０゜とすることを特徴とした小脚長高速水平すみ
肉ガスシールドアーク溶接方法にある。In another aspect of the present invention, a rutile flux-cored wire in which the wire component contains 0.03% to 0.50% of metal fluoride is used as at least a trailing electrode. And 8 fluxes per wire weight in steel jacket
Use a flux-cored wire filled with 25%. Furthermore, the target position of the leading end of the wire of the leading electrode is a corner portion, or within 2 mm from the corner portion as a base point,
1 mm or less on the standing plate side, and the electrode angle at this time is 4 mm from the lower plate.
A small leg length high speed horizontal fillet gas shielded arc welding method characterized by being 0 to 60 °.
【０００７】[0007]
【発明の実施の形態】図２に一般的に実用化されている
２電極１プール方式による高速水平すみ肉溶接状況を示
す。高速化にともなう必要溶着量を確保するためにフラ
ックス入りワイヤを用いた２電極溶接とし、また平滑な
ビード形状を得るために溶融プールが１プールになるよ
うに両電極を配置している。このとき先行電極１は主に
ビードの溶け込みに、後行電極２はビード形状に寄与す
る。本発明もこのような２電極１プール方式を基本とし
て行うものであるが、例えば目標脚長４ｍｍの小脚長ビ
ードを１．０ｍ／ｍｉｎの高速溶接で得ようとした場
合、以下のような課題がある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 shows a high-speed horizontal fillet welding situation by a two-electrode one-pool system which is generally put into practical use. Two-electrode welding using a flux-cored wire is used to secure the required welding amount accompanying the speeding-up, and both electrodes are arranged so that the molten pool becomes one pool to obtain a smooth bead shape. At this time, the leading electrode 1 mainly contributes to the penetration of the bead, and the trailing electrode 2 contributes to the bead shape. The present invention is also based on such a two-electrode one-pool system. For example, when a small leg-length bead having a target leg length of 4 mm is to be obtained by high-speed welding at 1.0 m / min, the following problems arise. is there.
【０００８】小脚長ビードを得るためには脚長が過大に
ならないように、両電極とも溶接電流を比較的低目に
し、かつ両電極のワイヤ狙い位置を立板と下板とのコー
ナー部に近づけて溶融プール全体を小さく形成して行
う。この場合、特に溶接部材の仮付けビード部において
は、コーナー部の溶け込み不足やビード形状の乱れが発
生しやすくなる。従って、仮付けビード部を十分に溶融
し安定した１プール状態が保持できるように、先行電極
は溶接電圧を意識的に低くしアーク力により掘り込みを
深くして行う必要がある。In order to obtain a small leg length bead, the welding current is made relatively low for both electrodes so that the leg length does not become excessive, and the wire aiming positions of both electrodes are brought close to the corners between the standing plate and the lower plate. This is done by making the entire molten pool small. In this case, in particular, in the temporary bead portion of the welding member, insufficient penetration of the corner portion and disorder of the bead shape are likely to occur. Therefore, in order to sufficiently melt the tacked bead portion and maintain a stable one-pool state, it is necessary to intentionally lower the welding voltage of the preceding electrode and deepen it by the arc force.
【０００９】しかし、仮付けビード部以外の通常部から
採取したビード断面を観察すると、図３に示すようにコ
ーナー部の溶け込みの底部、母材と溶接金属との境界近
くに、スラグ巻き込み１６が見られる場合がある。この
内部欠陥の発生は先行電極の溶接電圧が低く過ぎて、ワ
イヤ溶融が短絡気味となり且つアーク力による溶融金属
の攪拌作用が極めて少ないため、溶融スラグの浮上を阻
害していることに起因している。However, when observing the cross section of a bead sampled from a normal portion other than the tacked bead portion, as shown in FIG. 3, the slag entrapment 16 is found near the bottom of the corner penetration and near the boundary between the base metal and the weld metal. May be seen. The occurrence of this internal defect is caused by the fact that the welding voltage of the leading electrode is too low, the melting of the wire tends to be short-circuited, and the stirring action of the molten metal by the arc force is extremely small, thereby hindering the floating of the molten slag. I have.
【００１０】また、ビード表面欠陥であるピツトやガス
溝も溶融金属プールをより大きくして行う脚長５〜６ｍ
ｍの場合に比較して発生しやすくなる。これも主に上記
小脚長化のために特有な溶接条件に起因している。つま
り、仮付けビード部における溶け込みを確保するため
に、先行電極の溶接電圧を低くし過ぎていることによ
り、通常部では溶け込みが過剰に大きくなり、部材鋼板
に塗装されたプライマからの熱分解ガスが増加し、しか
も小脚長溶接の場合は溶融金属の凝固も速いので熱分解
ガスの速やかな外部への放出が妨げられることによる。[0010] In addition, pits and gas grooves, which are bead surface defects, are also formed by making the molten metal pool larger so that the leg length is 5-6 m.
This is more likely to occur than in the case of m. This is mainly due to the special welding conditions for the above-mentioned small leg length. In other words, the welding voltage of the leading electrode is set too low in order to ensure penetration at the tacked bead part, so that penetration at the normal part becomes excessively large, and pyrolysis gas from the primer coated on the member steel plate In the case of small leg length welding, the solidification of the molten metal is fast, so that the rapid release of the pyrolysis gas to the outside is hindered.
【００１１】さらに、ビード止端部が揃わずオーバーラ
ップ気味になりやすいことも小脚長化において見られる
課題である。これは脚長が過大にならないように後行電
極についても溶接電流及び溶接電圧を低目にして行うこ
とによる。Further, it is a problem that the bead toe ends are not aligned and tend to be overlapped, which is a problem seen in the case of a small leg length. This is because the welding current and the welding voltage of the trailing electrode are set low so that the leg length is not excessive.
【００１２】本発明者らは、上記２電極１プール方式で
小脚長高速水平すみ肉溶接を行った場合に起こりやすい
上記課題点に対し、主にフラックス入りワイヤを用いた
溶接施工条件を中心に検討した。その結果、フラックス
入りワイヤを用いる２電極溶接において、先行電極のワ
イヤ突き出し長さと後行電極のワイヤ突き出し長さを限
定することにより内部欠陥や表面欠陥がなく、形状も良
好な小脚長ビードが得られることを見い出し、所期の目
的を達成したものである。なお、本発明で言うワイヤ突
き出し長さとは、図１に示すようにチップ４と母材５と
の距離３である。The inventors of the present invention have focused on welding conditions using flux cored wires mainly for the above-mentioned problems that are likely to occur when small leg length high-speed horizontal fillet welding is performed using the two-electrode one-pool method. investigated. As a result, in two-electrode welding using a flux-cored wire, by limiting the wire protrusion length of the leading electrode and the wire protrusion length of the trailing electrode, a small-leg long bead having no internal defects or surface defects and a good shape can be obtained. To achieve the intended purpose. In addition, the wire protrusion length referred to in the present invention is a distance 3 between the chip 4 and the base material 5 as shown in FIG.
【００１３】自動で行うガスシールドアーク溶接におい
て、ワイヤ突き出し長さ（以下Ｅｘｔ．と言う）は溶接
状況に重大な影響を及ぼす。即ち、溶接電流が同一電流
の場合、Ｅｘｔ．が長い程、ワイヤ溶融速度が大きくな
るが、あまり長くし過ぎるとアークが不安定となりスパ
ッタが増加する。また、Ｅｘｔ．を長くすると溶け込み
深さが浅くなり、この時、ノズル位置も高くなるためシ
ールド性が劣化し気孔が発生し易くなる。一方、逆にＥ
ｘｔ．を短かくすると溶込み深さは深くなるが、ノズル
位置が低くなるためノズル内にスパッタが多量に付着
し、シールド不良による気孔が発生し易くなる。これら
の理由により、ガスシールドアーク溶接のＥｘｔ．は、
ワイヤ径１．２〜１．６ｍｍの場合、２０〜２５ｍｍに
保持するのが一般的とされているが、前記提案による従
来の２電極１プール方式の高速水平すみ肉溶接において
は、Ｅｘｔ．については全く検討されていない。In gas shielded arc welding performed automatically, the length of wire protrusion (hereinafter referred to as Ext.) Has a significant effect on the welding situation. That is, when the welding current is the same current, Ext. The longer the wire length, the higher the wire melting rate, but if it is too long, the arc becomes unstable and spatter increases. Ext. When the length is longer, the penetration depth becomes shallower, and at this time, the nozzle position also becomes higher, so that the shielding property is deteriorated and pores are easily generated. On the other hand, E
xt. If the length is shortened, the penetration depth becomes deeper, but a large amount of spatter adheres to the nozzle because the nozzle position is low, and pores due to poor shielding are likely to be generated. For these reasons, the Ext. Is
In the case of a wire diameter of 1.2 to 1.6 mm, it is generally assumed that the wire length is maintained at 20 to 25 mm. However, in the conventional high-speed horizontal fillet welding of the two-electrode one-pool method proposed by Ext. Is not considered at all.
【００１４】本発明では、２電極１プール方式で行う高
速すみ肉溶接における先行電極と後行電極による役割を
最大限に発揮させて小脚長ビードを形成する。まず、先
行電極の役割としては溶け込み深さの確保であるが、こ
れは溶接電圧を過剰に低くしなくともＥｘｔ．を短く保
持することで得られる。ワイヤ送給速度を一定にして行
う自動溶接の場合、図４にＥｘｔ．による溶接電流の変
化を示すように、Ｅｘｔ．を短くするとワイヤに流れる
電流値は高くなり、アーク力が増し溶け込みを深くする
ことができ、同時に溶融プールをよく攪拌しスラグの浮
上を促進する効果がある。この時、高電流溶接となる
が、ワイヤ溶融速度は変化しない。この先行電極により
溶け込みを深くし、ワイヤ溶融量を増加させないこと
が、小脚長ビード形成に対して極めて重要である。つま
り、溶け込みを確保しようとしてワイヤ送給速度を速く
してアーク力を強めると、先行電極のワイヤ溶融量が多
くなり、図２中に示した両電極間に形成する湯溜まり１
１が過度に成長し、アンダーカットや脚長の増大、ある
いは後行電極のアーク状態が不安定になる。In the present invention, a small leg long bead is formed by maximizing the role of the leading electrode and the trailing electrode in the high-speed fillet welding performed by the two-electrode one-pool method. First, the role of the leading electrode is to secure the penetration depth. This is because the Ext. Is kept short. In the case of automatic welding performed at a constant wire feeding speed, FIG. As shown in FIG. When the length is shortened, the current value flowing through the wire increases, the arc force increases, and the penetration can be deepened, and at the same time, there is an effect that the molten pool is well stirred and the slag floats. At this time, high current welding is performed, but the wire melting rate does not change. It is extremely important for the formation of a small leg long bead not to increase the penetration by the leading electrode and not to increase the amount of wire fusion. In other words, if the wire feeding speed is increased to secure the penetration and the arc force is increased, the amount of wire melting of the preceding electrode increases, and the pool 1 formed between the two electrodes shown in FIG.
1 grows excessively, resulting in an undercut, an increase in leg length, or an unstable arc state of the following electrode.
【００１５】他方、後行電極のＥｘｔ．を長くすること
により、後行電極のワイヤに流れる電流値は低くなり、
アーク力が弱まり、湯溜まりを安定に保持するように作
用する。この時、Ｅｘｔ．を長くしていることにより、
ジュール熱でワイヤ溶融量は低下することがないので、
目標脚長に見合った溶着量は維持できる。On the other hand, the Ext. , The current flowing through the wire of the succeeding electrode is reduced,
The arc force is weakened and acts to stably maintain the pool. At this time, Ext. By making it longer,
Because the wire melting amount does not decrease due to Joule heat,
The welding amount corresponding to the target leg length can be maintained.
【００１６】本発明は、この先行電極のＥｘｔ．と後行
電極のＥｘｔ．との関係を規定することによって、溶接
速度１ｍ／ｍｉｎ以上の高速で安定した小脚長ビードを
形成させる。以下に、先行電極及び後行電極のＥｘｔ．
の限定理由を述べる。According to the present invention, the Ext. And Ext. By defining this relationship, a high-speed and stable small leg long bead having a welding speed of 1 m / min or more is formed. The Ext. Of the leading electrode and the trailing electrode will be described below.
The reason for the limitation will be described.
【００１７】先行電極のＥｘｔ．（ＷＬ1 ）が１５ｍｍ
未満の場合、先行電極の役割である溶込み深さは、ワイ
ヤに流れる電流値が極めて高くなりアーク力が増すので
十分得られるが、アーク力が強くなり過ぎて先行電極か
ら生成した溶融金属の後退力が増して、両電極間の湯溜
りが安定しない。そのためアークが不安定となりスパッ
タが多発する。また、アークの輻射熱によるチップ磨耗
も著しくワイヤの通電不良によるアーク不安定化をさら
に助長する。逆に、先行電極のＥｘｔ．（ＷＬ1 ）が２
５ｍｍを超えると、アーク力が弱くなり過ぎて、十分な
溶け込み深さが得られない。従って、先行電極のＥｘ
ｔ．（ＷＬ1 ）は１５〜２５ｍｍに限定した。The Ext. (WL 1 ) is 15mm
If less than, the penetration depth, which is the role of the leading electrode, is sufficiently obtained because the current flowing through the wire is extremely high and the arc force increases, but the arc force becomes too strong and the molten metal generated from the leading electrode becomes The retraction force increases, and the pool between the two electrodes becomes unstable. As a result, the arc becomes unstable and spatter occurs frequently. Further, chip wear due to the radiant heat of the arc is remarkable, which further promotes destabilization of the arc due to poor conduction of the wire. Conversely, the Ext. (WL 1 ) is 2
If it exceeds 5 mm, the arc force becomes too weak, and a sufficient penetration depth cannot be obtained. Therefore, the leading electrode Ex
t. (WL 1) is limited to 15~25mm.
【００１８】次に後行電極のＥｘｔ．（ＷＬ2 ）が、
（ＷＬ1 ＋５ｍｍ）よりも小さい場合、後行電極による
アーク力が強過ぎて、湯溜まりが前方に押しやられ、湯
溜まりが安定しない。一方、後行電極のＥｘｔ．（ＷＬ
2 ）が、４５ｍｍ超では、ワイヤの狙い位置が安定せず
ビード止端部に乱れが発生したり、アークが不安定とな
りスパッタが増加する。従って、（ＷＬ1 ＋５ｍｍ）＜
（ＷＬ2 ）≦４５ｍｍとした。Next, the Ext. (WL 2 )
If it is smaller than (WL 1 +5 mm), the arc force by the trailing electrode is too strong, the pool is pushed forward, and the pool is not stabilized. On the other hand, the Ext. (WL
2 ) However, if it exceeds 45 mm, the target position of the wire is not stable, and the bead toe is disturbed or the arc becomes unstable and spatter increases. Therefore, (WL 1 +5 mm) <
(WL 2 ) ≦ 45 mm.
【００１９】本発明の２電極１プール方式での小脚長す
み肉溶接に用いるフラックス入りワイヤについては、先
行電極にはスラグ形成剤をほとんど含有しないメタル系
フラックス入りワイヤまたはルチール系フラックス入り
ワイヤ、後行電極にはルチール系フラックス入りワイヤ
を用いることにより、ＴｉＯ2 系スラグの効果でビード
形状が良好となる。なお、先行電極及び後行電極ともル
チール系フラックス入りワイヤの場合、スラグ生成量が
多くなるため小脚長のビード形状に最も効果的である。
また、プライマ塗装鋼板を溶接する場合には、耐プライ
マ性を向上させる金属弗化物を０．０３％〜０．５０％
添加したルチール系フラックス入りワイヤが好ましい。
即ち金属弗化物は粘性が小さく流動性のよい溶融スラグ
を形成して、ピット、ガス溝及びスラグ巻き込みの発生
防止に効果的である。金属弗化物が０．０３％以下では
その効果がなく、０．５％以上ではアークが不安定とな
り、スラグ被包性も劣化する。ワイヤのポテンシャル水
素量についても耐プライマ性の観点から極力抑える必要
があり、熱伝導度法による測定方法で１００ｐｐｍ以下
であることが好ましい。フラックス充填率は溶接能率及
びワイヤの生産性面から８〜２５重量％の範囲が好まし
い。Regarding the flux-cored wire used for small leg length fillet welding in the two-electrode one-pool method of the present invention, the leading electrode contains a metal-based flux-cored wire or rutile-based flux-cored wire containing almost no slag forming agent. By using a rutile flux cored wire for the row electrode, the bead shape is improved by the effect of the TiO 2 slag. In the case where both the leading electrode and the trailing electrode are rutile-based flux-cored wires, the amount of slag generated is large, which is most effective for a bead shape with a small leg length.
When welding a primer-coated steel sheet, metal fluoride for improving primer resistance is contained in an amount of 0.03% to 0.50%.
The added rutile flux cored wire is preferred.
That is, the metal fluoride forms a molten slag having a small viscosity and a good fluidity, and is effective in preventing the occurrence of pits, gas grooves and slag entrainment. If the metal fluoride content is 0.03% or less, the effect is not obtained. If the metal fluoride content is 0.5% or more, the arc becomes unstable and the slag encapsulation property is deteriorated. It is necessary to minimize the potential hydrogen amount of the wire from the viewpoint of primer resistance, and it is preferable that the amount is 100 ppm or less as measured by a thermal conductivity method. The flux filling rate is preferably in the range of 8 to 25% by weight in terms of welding efficiency and wire productivity.
【００２０】ワイヤ径は、両電極とも小脚長ビード形成
のために溶融プール幅を狭めてアンダーカットの発生を
防止し、かつ高速化のために高溶着性が得られるように
細径の１．２〜１．６ｍｍが好ましい。ワイヤ断面形状
は図５に示すような一般的な形状のものでよいが、外皮
金属部１７に開口部がないシームレスタイプ（ｄ）がワ
イヤ送給性、直進性に優れているのでアーク及びワイヤ
先端狙い位置が安定し、コーナー部の溶け込みやビード
止端部の揃いが良好になるとともに、フラックス１８の
吸湿がなく耐プライマ性や耐割れ性面からも優れてい
る。The wire diameter of both electrodes is reduced so as to prevent the occurrence of undercut by narrowing the width of the molten pool for forming a small leg long bead and to obtain a high welding property for speeding up. 2 to 1.6 mm is preferred. The sectional shape of the wire may be a general shape as shown in FIG. 5, but the seamless type (d) having no opening in the outer metal part 17 is excellent in wire feedability and straightness, so that the arc and the wire can be formed. The aiming position of the tip is stable, the penetration of the corner portion and the uniformity of the bead toe are improved, and the flux 18 does not absorb moisture, and is excellent in primer resistance and crack resistance.
【００２１】以下に、本発明を実施するに当たり、特に
小脚長ビード形成のために必要な施工要領について説明
する。先行電極と後行電極間の極間距離は基本的に１プ
ールとなるように配置するが、極間距離の拡大は溶融プ
ールからのプライマ熱分解ガスを外部に放出しやすく
し、ピツトやガス溝の発生防止に極めて効果的である。
本発明では少なくとも後行電極にはルチール系フラック
ス入りワイヤを用いることが好ましく、この場合極間距
離は３５ｍｍ程度まで拡大できる。極間距離が４０ｍｍ
を超えると、明らかに安定した湯溜まりを形成できな
い。即ち、先行電極により生成した溶融スラグが半凝固
状態となり、その上を後行電極のアークが溶かす形態の
２プール溶接となるため、ビード形状が凸状となる。一
方、極間距離が１５ｍｍ未満では、電極間での相互アー
ク干渉によりアークが乱れ、アーク不安定によるスパッ
タ多発等の問題が起こる。In the following, in carrying out the present invention, a construction procedure particularly required for forming a small leg long bead will be described. The distance between the leading electrode and the trailing electrode is basically set to be one pool, but the increase in the distance between the electrodes makes it easier to release the primer pyrolysis gas from the molten pool to the outside, and the pits and gas It is extremely effective in preventing the formation of grooves.
In the present invention, it is preferable to use a rutile flux-cored wire for at least the trailing electrode. In this case, the distance between the electrodes can be increased to about 35 mm. Distance between poles is 40mm
If the temperature exceeds the above range, it is impossible to form a clearly stable water pool. That is, the molten slag generated by the leading electrode is in a semi-solid state, and the pool of the molten slag is melted by the following electrode to form a two-pool welding, so that the bead shape is convex. On the other hand, if the distance between the electrodes is less than 15 mm, the arc is disturbed by mutual arc interference between the electrodes, and problems such as frequent spatters due to arc instability occur.
【００２２】仮付けビード部も含めて溶接欠陥がなくビ
ード形状も良好な健全な小脚長ビードを安定して得るた
めには、ワイヤ先端狙い位置及び電極角度も重要であ
る。先行電極でコーナー部を十分に溶け込ませる必要が
あり、先行電極のワイヤ先端狙い位置はコーナー部２２
（図６）、あるいはコーナー部を基点とし下板側２ｍｍ
以内、立板側１ｍｍ以内の範囲とし、この時の電極角度
２０（図６）は４０〜６０゜の範囲にすることが好まし
い。In order to stably obtain a sound small leg length bead having no weld defect including a temporary bead portion and having a good bead shape, a target position of a wire tip and an electrode angle are also important. It is necessary to sufficiently dissolve the corner portion with the leading electrode.
(Fig. 6) or 2mm on the lower plate side with the corner as the base point
It is preferable that the electrode angle 20 (FIG. 6) at this time be in the range of 40 to 60 °.
【００２３】先行電極のワイヤ先端狙い位置がコーナー
部から離れ過ぎている場合、仮付けビード部の十分な溶
かし込みができない。また仮付けビード部以外の通常部
においてもコーナー部の溶け込み不足の他、アンダーカ
ットやオーバーラップ、スパッタ付着など安定した小脚
長ビードが得られない。When the target position of the leading end of the wire of the preceding electrode is too far from the corner, the temporary bead cannot be sufficiently melted. In addition, in a normal portion other than the tacked bead portion, a stable small leg long bead such as undercut, overlap, and spatter adhesion cannot be obtained in addition to insufficient penetration of the corner portion.
【００２４】電極角度２０（図６）が４０゜未満では仮
付けビード部の溶け込みが不足し、通常部においては立
板側ビード止端部にアンダーカットが発生しやすくな
る。一方、電極角度２０（図６）が６０゜を超えた場合
にも溶け込み不足やアンダーカットが発生し、また立板
側の脚長が確保できない下付きビードとなる。When the electrode angle 20 (FIG. 6) is less than 40 °, the penetration of the tacked bead portion is insufficient, and in the normal portion, an undercut is easily generated at the bead toe end on the standing plate side. On the other hand, when the electrode angle 20 (FIG. 6) exceeds 60 °, insufficient penetration or undercut occurs, and a subordinate bead in which the leg length on the upright side cannot be secured.
【００２５】後行電極は、先行電極の溶接状況を観察し
て調整することが肝心であるが、ワイヤ先端狙い位置は
両極間の湯溜まりを安定させ、かつ脚長を小さく保持す
るために先行電極による溶融プール上とし、電極角度２
１（図６）を４０〜７０゜にすることにより母材とのな
じみのよいビード止端部が形成できる。It is important to adjust the trailing electrode by observing the welding condition of the leading electrode. However, the aiming position of the tip of the wire is to stabilize the pool between the two electrodes and to keep the leg length small. And the electrode angle 2
By setting 1 (FIG. 6) to 40 to 70 °, a bead toe with good compatibility with the base material can be formed.
【００２６】溶接進行方向に対する電極角度は先行電極
を後退角６（５〜１５゜）（図２）にし、後行電極は前
進角７（５〜１５゜）にしてアーク力を湯溜まりに吸収
させるようにする。安定した湯溜まりアンダーカットの
発生やビードの凸状化を防止する。With respect to the electrode angle with respect to the welding progress direction, the leading electrode is set to a sweep angle of 6 (5 to 15 °) (FIG. 2), and the trailing electrode is set to an advancing angle of 7 (5 to 15 °) to absorb the arc force into the pool. Let it do. Prevents stable underwater pool undercuts and bead convexity.
【００２７】シールドガスはＣＯ2 ガスがコスト的にも
安価で一般的であるが、スパッタやヒューム量の低減に
効果的なＡｒ−ＣＯ2 混合ガスやＡｒガスを使用しても
よい。以下に本発明の実施の形態を実施例に基づいて説
明する。As the shielding gas, a CO 2 gas is generally inexpensive in terms of cost, but an Ar—CO 2 mixed gas or an Ar gas that is effective for reducing the amount of spatter and fume may be used. Hereinafter, embodiments of the present invention will be described based on examples.
【００２８】[0028]
【実施例】表１に示すフラックス組成で、ワイヤ断面形
状がシームレスタイプのフラックス入りワイヤ（ワイヤ
径１．６ｍｍ及び１．４ｍｍ、フラックス充填率１５重
量％）を用いて、表２に示す溶接施工条件で、図６に示
すＴ型すみ肉試験体（ＳＭ４９０、板厚９ｍｍ、溶接長
２．０ｍ、無機ジンクプライマ塗装、膜厚約２０μｍ）
を、両側同時溶接の２電極１プール方式による水平すみ
肉溶接試験（ツインタンデム溶接、両側のシフト距離０
〜５ｍｍ、目標脚長３〜４ｍｍ）を行った。表３及び表
４に溶接試験結果を示す。アーク安定性の評価記号は、
◎印：アークが安定しスパッタが少ない、△印：アーク
安定性に欠け、スパッタが多いとした。コーナー部の溶
込みの評価記号は、◎印：コーナー部の溶け込みが２ｍ
ｍ以上、△印：コーナー部からの溶込みが２ｍｍ未満ま
たはコーナー部が未溶融である。総合評価記号は、◎
印：良好、×印：不良である。EXAMPLE Using a flux-cored wire (having a wire composition of 1.6 mm and 1.4 mm and a flux filling rate of 15% by weight) having a flux composition shown in Table 1 and a seamless wire cross section, the welding shown in Table 2 was carried out. Under the conditions, a T-type fillet specimen shown in FIG. 6 (SM490, plate thickness 9 mm, welding length 2.0 m, inorganic zinc primer coating, film thickness about 20 μm)
The horizontal fillet welding test using two electrodes and one pool method of simultaneous welding on both sides (twin tandem welding, shift distance on both sides of 0)
-5 mm, target leg length 3-4 mm). Tables 3 and 4 show the welding test results. The evaluation symbol for arc stability is
◎: The arc was stable and the spatter was small. Δ: The arc stability was poor and the spatter was large. The symbol for evaluation of penetration at the corner is ◎: Penetration at the corner is 2 m
m or more, Δ: Penetration from the corner is less than 2 mm or the corner is not melted. Comprehensive evaluation symbol is ◎
Mark: good, x mark: bad.
【００２９】[0029]
【表１】 [Table 1]
【００３０】[0030]
【表２】 [Table 2]
【００３１】[0031]
【表３】 [Table 3]
【００３２】[0032]
【表４】 [Table 4]
【００３３】本発明による試験Ｎｏ．１〜７（目標脚長
４ｍｍ）及びＮｏ．２０、２１（目標脚長３ｍｍ）は、
安定した溶接状況下、溶接欠陥がなく形状も良好なビー
ドが得られた。これに対し、試験Ｎｏ.８〜１２は比較
例である。Test No. 1 according to the present invention. Nos. 1 to 7 (target leg length 4 mm) and Nos. 20, 21 (target leg length 3 mm)
Under stable welding conditions, a bead having a good shape with no welding defects was obtained. On the other hand, Test Nos. 8 to 12 are comparative examples.
【００３４】Ｎｏ．８は、先行電極及び後行電極のＥｘ
ｔ．がいずれも短いためにアーク力が強くなりすぎて、
湯溜りが安定せずアンダーカット、スラグ巻き込みも多
発した。ノズルへのスパッタ付着も多い。No. 8 is the leading electrode and the trailing electrode Ex
t. However, the arc force is too strong because each is short,
The water pool was not stable, and undercuts and slag involved frequently occurred. Spatter adheres to the nozzle frequently.
【００３５】Ｎｏ．９は、先行及び後行電極ともメタル
系フラックス入りワイヤを用いたため、ビード形状が凸
状となった。No. In No. 9, the bead shape was convex because a metal-based flux-cored wire was used for both the leading and trailing electrodes.
【００３６】Ｎｏ．１０は、Ｅｘｔ．がいずれも長すぎ
たため、コーナー部の溶込みが浅く、また、ワイヤ狙い
位置が安定せずビード形状も不良となった。No. 10 is Ext. However, since both were too long, the penetration at the corner portion was shallow, and the target position of the wire was not stable and the bead shape was poor.
【００３７】Ｎｏ．１１は、後行電極のＥｘｔ．が短い
ためアーク力が強まり、湯溜まりが不安定となりビード
止端部が不揃いで、しかも、スラグ巻き込みが発生し
た。No. 11 is Ext. , The arc force was increased, the pool became unstable, the bead toe portions were not uniform, and slag was involved.
【００３８】Ｎｏ．１２は、後行電極にメタル系フラッ
クス入りワイヤを用いたことで下脚のビード不揃いが発
生した。No. In No. 12, the bead of the lower leg was uneven due to the use of the metal flux-cored wire for the trailing electrode.
【００３９】[0039]
【発明の効果】以上説明したように、本発明は耐溶接欠
陥性及びビード形状が良好な２電極１プール方式の小脚
長高速水平すみ肉ガスシールドアーク溶接方法を提案し
たものであり、溶接の高能率化、低コスト化に貢献でき
る。As described above, the present invention proposes a small electrode length high speed horizontal fillet gas shielded arc welding method of a two-electrode one-pool type having good welding defect resistance and good bead shape. It can contribute to higher efficiency and lower cost.
【図１】Ｅｘｔ．長さの測定方法を示す図FIG. Diagram showing how to measure the length
【図２】２電極１プール方式による高速水平すみ肉溶接
状況を示す図FIG. 2 is a diagram showing a high-speed horizontal fillet welding situation using a two-electrode one-pool method.
【図３】ビード内部欠陥を示す図FIG. 3 is a diagram showing a defect inside a bead.
【図４】Ｅｘｔ．長さと溶接電流の一例の関係を示す図FIG. Diagram showing the relationship between length and an example of welding current
【図５】フラックス入りワイヤの断面形状の例FIG. 5 is an example of a cross-sectional shape of a flux-cored wire
【図６】実施例に用いた試験板の形状を示す図FIG. 6 is a diagram showing the shape of a test plate used in an example.
１ 先行電極 ２ 後行電極 ３ ワイヤ突き出し長さ（Ｅｘｔ．） ４ 溶接チップ ５ 下板 ６ 先行電極の電極角度 ７ 後行電極の電極角度 ８ 極間距離 ９ 先行電極のアーク １０ 後行電極のアーク １１ 湯溜まり １２ 溶融プール １３ すみ肉ビード（溶接金属） １４ 生成スラグ １５ 立板 １６ 内部欠陥 １７ 外皮金属 １８ フラックス １９ プライマ ２０ 先行電極の電極角度 ２１ 後行電極の電極角度 ２２ コーナー部 DESCRIPTION OF SYMBOLS 1 Leading electrode 2 Trailing electrode 3 Wire protrusion length (Ext.) 4 Welding tip 5 Lower plate 6 Leading electrode electrode angle 7 Trailing electrode electrode angle 8 Distance between electrodes 9 Leading electrode arc 10 Trailing electrode arc DESCRIPTION OF SYMBOLS 11 Hot water pool 12 Melt pool 13 Fillet bead (weld metal) 14 Generated slag 15 Standing plate 16 Internal defect 17 Skin metal 18 Flux 19 Primer 20 Electrode angle of preceding electrode 21 Electrode angle of succeeding electrode 22 Corner part
Claims (4)
極１プール方式の水平すみ肉ガスシールドアーク溶接方
法において、先行電極のワイヤ突き出し長さ（ＷＬ1 ）
が後行電極の突き出し長さ（ＷＬ2 ）に対し、下式
（１）を満足し、かつ、少なくとも後行電極はルチール
系フラックス入りワイヤとし、溶接速度１．０ｍ／ｍｉ
ｎ以上で脚長３〜４ｍｍビードを形成し、溶接欠陥が少
なく良好なビード形状が得られることを特徴とする小脚
長高速水平すみ肉ガスシールドアーク溶接方法。 （ＷＬ1 ＋５ｍｍ）＜ＷＬ2 ≦４５ｍｍ ・・・・・（１） 但し、ＷＬ1 ＝１５〜２５ｍｍIn a two-electrode, one-pool horizontal fillet gas shielded arc welding method performed using a flux-cored wire, a wire protrusion length (WL 1 ) of a leading electrode is provided.
Satisfies the following formula (1) with respect to the protruding length (WL 2 ) of the trailing electrode, and at least the trailing electrode is a rutile flux cored wire, and the welding speed is 1.0 m / mi.
A small leg length high speed horizontal fillet gas shielded arc welding method characterized by forming a bead having a leg length of 3 to 4 mm at n or more and obtaining a good bead shape with few welding defects. (WL 1 +5 mm) <WL 2 ≦ 45 mm (1) where WL 1 = 15 to 25 mm
％〜０．５０％含有するルチール系フラックス入りワイ
ヤを少なくとも後行電極に用いることを特徴とする請求
項１記載の小脚長高速水平すみ肉ガスシールドアーク溶
接方法。2. The method according to claim 1, wherein said wire component contains 0.03 of metal fluoride.
2. The method of claim 1, wherein a rutile flux-cored wire is used for at least the trailing electrode. 3.
たり８〜２５％充填してなるフラックス入りワイヤを用
いる請求項１又は請求項２記載の小脚長高速水平すみ肉
ガスシールドアーク溶接方法。3. The gas shielded arc welding method according to claim 1 or 2, wherein a flux-cored wire obtained by filling a steel sheath with a flux of 8 to 25% based on the weight of the wire is used.
ー部、あるいはコーナー部を基点とし下板側２ｍｍ以
内、立板側１ｍｍ以下とし、この時の電極角度は下板か
ら４０〜６０゜とする請求項１、請求項２又は請求項３
記載の小脚長高速水平すみ肉ガスシールドアーク溶接方
法。4. The target position of the leading electrode at the tip of the wire is a corner portion or less than 2 mm on the lower plate side and 1 mm or less from the corner portion with the corner as a base point, and the electrode angle at this time is 40 to 60 ° from the lower plate. Claim 1, Claim 2 or Claim 3
The described small leg length high speed horizontal fillet gas shielded arc welding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3695797A JPH10216943A (en) | 1997-02-06 | 1997-02-06 | Gas shielded metal arc welding method of small leg length high-speed horizontal fillet type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3695797A JPH10216943A (en) | 1997-02-06 | 1997-02-06 | Gas shielded metal arc welding method of small leg length high-speed horizontal fillet type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10216943A true JPH10216943A (en) | 1998-08-18 |
Family
ID=12484236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3695797A Withdrawn JPH10216943A (en) | 1997-02-06 | 1997-02-06 | Gas shielded metal arc welding method of small leg length high-speed horizontal fillet type |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10216943A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009190042A (en) * | 2008-02-12 | 2009-08-27 | Nippon Steel & Sumikin Welding Co Ltd | Two-electrode fillet gas-shielded metal arc welding method |
| JP2013111597A (en) * | 2011-11-28 | 2013-06-10 | Panasonic Corp | Arc welding method |
| CN103659043A (en) * | 2012-09-12 | 2014-03-26 | 昆山京群焊材科技有限公司 | Series-connected double-wire type combined welding wire for CO2 gas shield high-speed flat fillet weld |
| JP2014180692A (en) * | 2013-03-19 | 2014-09-29 | Kobe Steel Ltd | Tandem gas shield arc welding method |
| JP2016049548A (en) * | 2014-08-29 | 2016-04-11 | 株式会社神戸製鋼所 | Tandem arc welding method, tandem arc welding device and tandem arc welding system |
| CN109226938A (en) * | 2017-07-10 | 2019-01-18 | 株式会社神户制钢所 | Multielectrode gas-shielded electric arc single side soldering method |
-
1997
- 1997-02-06 JP JP3695797A patent/JPH10216943A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009190042A (en) * | 2008-02-12 | 2009-08-27 | Nippon Steel & Sumikin Welding Co Ltd | Two-electrode fillet gas-shielded metal arc welding method |
| JP2013111597A (en) * | 2011-11-28 | 2013-06-10 | Panasonic Corp | Arc welding method |
| CN103659043A (en) * | 2012-09-12 | 2014-03-26 | 昆山京群焊材科技有限公司 | Series-connected double-wire type combined welding wire for CO2 gas shield high-speed flat fillet weld |
| CN103659043B (en) * | 2012-09-12 | 2016-01-20 | 昆山京群焊材科技有限公司 | CO 2gas shield high speed flat fillet weld series connection double-wire type combination welding wire |
| JP2014180692A (en) * | 2013-03-19 | 2014-09-29 | Kobe Steel Ltd | Tandem gas shield arc welding method |
| JP2016049548A (en) * | 2014-08-29 | 2016-04-11 | 株式会社神戸製鋼所 | Tandem arc welding method, tandem arc welding device and tandem arc welding system |
| CN109226938A (en) * | 2017-07-10 | 2019-01-18 | 株式会社神户制钢所 | Multielectrode gas-shielded electric arc single side soldering method |
| CN109226938B (en) * | 2017-07-10 | 2021-06-15 | 株式会社神户制钢所 | Multi-electrode gas shielded arc single-side welding method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20040406 |