JPH08290294A - Flux cored wire for gas shielded arc welding - Google Patents
Flux cored wire for gas shielded arc weldingInfo
- Publication number
- JPH08290294A JPH08290294A JP9280395A JP9280395A JPH08290294A JP H08290294 A JPH08290294 A JP H08290294A JP 9280395 A JP9280395 A JP 9280395A JP 9280395 A JP9280395 A JP 9280395A JP H08290294 A JPH08290294 A JP H08290294A
- Authority
- JP
- Japan
- Prior art keywords
- flux
- wire
- cored wire
- welding
- arc welding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Nonmetallic Welding Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は鋼構造物の溶接に用いる
ガスシールドアーク溶接用フラックス入りワイヤに係わ
り、特に高能率な溶接ができ、かつ溶接作業性が良好で
耐割れ性にも優れた金属粉系のガスシールドアーク溶接
用フラックス入りワイヤに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flux-cored wire for gas shielded arc welding used for welding steel structures, which enables particularly efficient welding, has excellent welding workability, and has excellent crack resistance. TECHNICAL FIELD The present invention relates to a flux-cored wire for metal powder-based gas shield arc welding.
【０００２】[0002]
【従来の技術】近年、ガスシールドアーク溶接用フラッ
クス入りワイヤは、軟鋼５０キロ級高張力鋼をはじめと
する各種鋼種の鋼構造物の溶接に広く用いられている
が、充填フラックス組成により全姿勢溶接性或いはすみ
肉溶接性を重視してＴｉＯ2 等のスラグ形成剤とＳｉ，
Ｍｎ等の脱酸剤、合金剤からなるものと、溶接能率を重
視して鉄粉を主体にした金属粉を多量に含有するもの
（以下、金属粉系フラックス入りワイヤという）とに大
別できる。また、それぞれのフラックス入りワイヤの断
面構造は図１に示すように、外皮部１に貫通した隙間が
ないもの（ａ）（以下、シームレスタイプという）と貫
通した隙間３があるもの（ｂ），（ｃ）とに分類でき
る。2. Description of the Related Art In recent years, flux-cored wires for gas shielded arc welding have been widely used for welding steel structures of various steel types such as mild steel 50 kg class high strength steel. Focusing on weldability or fillet weldability, slag forming agents such as TiO 2 and Si,
It can be roughly classified into those composed of deoxidizing agents such as Mn and alloying agents, and those containing a large amount of metal powder mainly composed of iron powder with emphasis on welding efficiency (hereinafter referred to as metal powder-based flux-cored wire). . In addition, as shown in FIG. 1, the cross-sectional structure of each flux-cored wire is such that there is no gap penetrating the outer skin portion 1 (a) (hereinafter referred to as seamless type) and there is a gap 3 penetrating (b), (C) can be classified.
【０００３】金属粉系フラックスりワイヤの利点はスラ
グ形成剤をほとんど含有しないためにスラグ生成量が少
ないので、溶着効率が高く、厚板の多層溶接等でスラグ
の除去が要らず連続溶接が可能である。一方、金属粉系
のフラックス入りワイヤの欠点として、フラックス充填
後の特に細径段階の伸線工程において断線しやすく生産
性が悪く、また溶接性能についてもスパッタの発生量が
多いという問題がある。The advantage of the metal powder-based flux wire is that since it contains almost no slag-forming agent, the amount of slag produced is small, so that the welding efficiency is high and continuous welding is possible without removing slag in multi-layer welding of thick plates. Is. On the other hand, as a drawback of the metal powder-based flux-cored wire, there is a problem that after the flux is filled, the wire is easily broken particularly in the wire drawing step of a small diameter stage, the productivity is poor, and the welding performance is large in the amount of spatter.
【０００４】このような問題を解決するために、例えば
特開昭６３−９０３９２号公報は充填フラックス中の鉄
粉の粒径を規定することにより生産性の向上を図ったも
のであり、特開昭６０−２５７９９３号公報は金属粉の
流動度を規定し均一にフラックスを充填することによ
り、特公平６−３２８７３号公報は鉄粉の成分を特定す
ることにより、アーク安定性や低スパッタ化を図ったも
のである。特開平３−２２１２３９７号公報はマイカ，
タルクのような潤滑性物質を添加して充填率の均一化と
伸線性改善ができることを提案しているが、これら潤滑
性物質はＣ、水分等を含有するので溶接作業性に悪影響
を及ぼし、また分解温度が低く高温度の中間焼鈍が行え
ないので低水素化が不十分で多層盛溶接による溶接部に
割れが発生しやすいという問題がある。In order to solve such a problem, for example, Japanese Patent Application Laid-Open No. 63-90392 aims to improve productivity by defining the particle size of iron powder in the filling flux. Japanese Laid-Open Patent Publication No. 60-257993 regulates the fluidity of metal powder and uniformly fills it with flux, and Japanese Examined Patent Publication No. 6-32873 discloses the stability of iron powder and spatter reduction by specifying the components of iron powder. It is intended. Japanese Unexamined Patent Publication (Kokai) No. 3-2212397 discloses mica,
It has been proposed that a lubricating substance such as talc can be added to make the filling rate uniform and improve the wire drawability. However, since these lubricating substances contain C, moisture, etc., they adversely affect the welding workability, Further, since the decomposition temperature is low and the intermediate annealing at a high temperature cannot be performed, there is a problem that the hydrogen reduction is insufficient and cracks are likely to occur in the welded portion by the multi-pass welding.
【０００５】[0005]
【発明が解決しようとする課題】上記のように従来より
種々の提案がなされてきたが，細径段階の高速伸線にお
いてはしばしば断線が問題となり、また最近の溶接の自
動化、ロボット化に金属粉系フラックス入りワイヤは最
適であり、さらに低スパッタ化や低水素化等の溶接性向
上の要望が強い。As described above, various proposals have been made in the past. However, disconnection often becomes a problem in high-speed wire drawing in a small diameter stage, and metal has been recently used for welding automation and robotization. The powder-based flux-cored wire is optimal, and there is a strong demand for improved weldability such as low spatter and low hydrogen.
【０００６】そこで、本発明は生産性向上を十分に考慮
し、溶接性能が安定して良好な金属粉系のガスシールド
アーク溶接用フラックス入りワイヤを提供することを目
的とする。In view of the above, it is an object of the present invention to provide a flux-cored wire for gas shielded arc welding of a metal powder type, which has stable welding performance and which has good productivity.
【０００７】[0007]
【課題を解決するための手段】即ち、本発明の要旨は、
（１）鋼製外皮内に鉄粉を主体とする金属粉を８５重量
％以上含有するフラックスを充填してなるガスシールド
アーク溶接用フラックス入りワイヤにおいて、粒径１．
０μｍ以下の超微粉末状の酸化鉄を０．２〜５．０重量
％含有するフラックスをワイヤ全重量に対して１０〜３
０重量％充填したものであることを特徴とするガスシー
ルドアーク溶接用フラックス入りワイヤ、及び（２）鋼
製外皮内に鉄粉を主体とする金属粉を８５重量％以上含
有するフラックスを充填してなるガスシールドアーク溶
接用フラックス入りワイヤにおいて、粒径１．０μｍ以
下の超微粉末状の酸化鉄を０．２〜５．０重量％含有す
るフラックスをワイヤ全重量に対して１０〜３０重量％
充填したものであり、かつ鋼製外皮部に貫通した隙間が
ないことを特徴とするガスシールドアーク溶接用フラッ
クス入りワイヤにある。That is, the gist of the present invention is as follows.
(1) In a flux-cored wire for gas shield arc welding, which comprises a steel outer shell filled with a flux containing 85% by weight or more of a metal powder composed mainly of iron powder, the particle size is 1.
A flux containing 0.2 to 5.0% by weight of ultrafine powdered iron oxide of 0 μm or less is used in an amount of 10 to 3 with respect to the total weight of the wire.
Flux-cored wire for gas shielded arc welding, characterized in that it is filled with 0% by weight, and (2) a flux containing 85% by weight or more of metal powder, which is mainly iron powder, is filled in a steel shell. In a flux-cored wire for gas shielded arc welding, the flux containing 0.2 to 5.0% by weight of ultrafine iron oxide powder having a particle size of 1.0 μm or less is 10 to 30% by weight based on the total weight of the wire. %
A flux-cored wire for gas shield arc welding, which is filled and has no gap penetrating the steel outer shell.
【０００８】[0008]
【作用】以下に本発明を詳細に説明する。まず、本発明
においてフラック中の金属粉を８５重量％以上と限定し
たのは、余分なスラグを溶接中に生成させず、溶着効率
を高めるためである。フラックス中の金属粉の比率が８
５重量％未満では溶着効率においてソリッドワイヤより
明らかに低くなること、多層盛溶接の場合に生成スラグ
が多くなりすぎ１パス毎にスラグ除去を要するようにな
り溶接能率が低下する。ここでいう金属粉とは鉄粉の
他、Ｓｉ，Ｍｎ，Ｔｉ，Ｂ，Ａｌ，Ｍｇ，Ｃａ等の脱酸
剤、必要に応じて添加するＮｉ，Ｃｒ，Ｍｏ，Ｃｕ等の
合金剤を意味している。これら成分の添加方法は各々単
体で添加しても、またこれら成分による合金として添加
してもよい。なお、上記金属粉成分の内、特に鉄粉は溶
着速度を向上させ溶接能率をあげるために４１重量％以
上含有させる。しかし、８０重量％を超えると金属粉中
の脱酸剤、合金剤等が不足し所望の溶接金属性能が得に
くくなる。The present invention will be described in detail below. First, the reason why the metal powder in the flakes is limited to 85% by weight or more in the present invention is to prevent excess slag from being generated during welding and to improve the welding efficiency. The ratio of metal powder in the flux is 8
If it is less than 5% by weight, the welding efficiency will be clearly lower than that of the solid wire, and in the case of multi-layer welding, the amount of slag produced will be too large and it will be necessary to remove the slag for each pass, and the welding efficiency will decrease. The metal powder here means iron powder, deoxidizing agents such as Si, Mn, Ti, B, Al, Mg, and Ca, and alloying agents such as Ni, Cr, Mo, and Cu that are added as necessary. are doing. As a method of adding these components, each may be added alone or as an alloy of these components. Of the above metal powder components, iron powder is contained in an amount of 41% by weight or more in order to improve the welding speed and improve the welding efficiency. However, if it exceeds 80% by weight, the deoxidizing agent, alloying agent, etc. in the metal powder become insufficient, and it becomes difficult to obtain desired weld metal performance.
【０００９】金属粉の含有量を８５重量％以上にするこ
とにより、金属粉系フラックス入りワイヤの特徴である
溶接能率の向上は達成できる。しかし、製造時に前記断
線問題をともなう。本発明者らは断線の防止に対し種々
検討した結果、超微粉末状の酸化鉄をフラックス中に少
量含有させることにより、低水素化のために高温度の中
間焼鈍を行った場合においても断線を防止でき、これに
よる金属粉系フラックス入りワイヤはアークが安定しス
パッタが少なくなることを見いだしたものである。When the content of the metal powder is 85% by weight or more, the improvement of the welding efficiency, which is a characteristic of the metal powder-based flux-cored wire, can be achieved. However, the problem of disconnection occurs at the time of manufacturing. As a result of various investigations on the prevention of wire breakage, the present inventors have found that a small amount of ultrafine powdered iron oxide is contained in the flux, so that wire breakage occurs even when high temperature intermediate annealing is performed for low hydrogenation. It has been found that the metal powder flux-cored wire by this can stabilize the arc and reduce the spatter.
【００１０】図３に細径段階の伸線中に断線が多発した
シームレスタイプの従来の金属粉系フラックス入りワイ
ヤ（ワイヤ径：１．２mm、充填率１５重量％）のワイヤ
長手方向断面の観察結果を模式的に示す。外皮部には断
面積が小さくなっている部分、即ち外皮肉厚が薄い部分
があり、フラックス部２にはフラックスの充填状態を断
続させている微小な亀裂４が認められた。この微小な亀
裂、即ちフラックス充填率の極端な不均一箇所は細径段
階の伸線において外皮部の延びにフラックス部が追従し
きれずに生じたもので、フラックス充填率のばらつきが
大きい場合に発生しやすい。FIG. 3 is an observation of a cross section in the longitudinal direction of a seamless type conventional metal powder-based flux-cored wire (wire diameter: 1.2 mm, filling rate: 15% by weight), which is frequently broken during wire drawing in a small diameter stage. The results are shown schematically. The outer skin portion has a portion with a small cross-sectional area, that is, a thin outer skin thickness, and in the flux portion 2, minute cracks 4 that interrupt the filled state of the flux were observed. This minute crack, that is, an extremely uneven portion of the flux filling rate is caused when the flux portion cannot follow the extension of the outer skin portion during wire drawing in the small diameter stage, and occurs when there is a large variation in the flux filling rate. It's easy to do.
【００１１】外皮の軟化及び脱水素のために高温度の中
間焼鈍を行った場合には、さらにフラックス部の亀裂は
発生しやすく、このときフラックス部は焼結状態となっ
ている。また、外皮部内壁には塊状化したフラックス５
の噛み込みも観察できる。この塊状フラックスは縮径に
ともない金属粉どうしが加圧変形し局部的に固く結合し
或いは焼結状態になって、外皮部に噛み込んだものであ
り、外皮肉厚が薄くなっており断線を誘発する箇所とい
える。なお、このような不連続な断面を呈する金属粉系
フラックスワイヤによる溶接試験結果はアークが不安定
でスパッタが多発した。When high temperature intermediate annealing is performed for softening and dehydrogenating the outer shell, cracks in the flux portion are more likely to occur, and at this time the flux portion is in a sintered state. In addition, the lumped flux 5 is formed on the inner wall of the outer skin.
You can also observe the biting. This lumpy flux is a metal powder that is deformed by pressure due to the diameter reduction and is locally hard-bonded or is in a sintered state and is caught in the outer skin. It can be said that it is a place to induce. In addition, the welding test results using the metal powder-based flux wire having such a discontinuous cross section showed that the arc was unstable and spatter frequently occurred.
【００１２】これに対し、図２は本発明による超微粉末
状の酸化鉄を含有させて試作し、断線がなかった金属粉
系フラックス入りワイヤのワイヤ長手方向の断面の観察
結果を示したものであるが、中間焼鈍の有無に係わらず
外皮部及びフラックス部には特に際立った異常は認めら
れない。また溶接作業性も安定して良好であった。即
ち、金属粉系フラックス入りワイヤの製造過程における
伸線性と溶接作業性とは密接な関係にあり、フラックス
充填率及び外皮部の肉厚を均一にして断線を防止するこ
とによりアークが安定しスパッタ発生量も減少する。On the other hand, FIG. 2 shows an observation result of a cross section in a wire longitudinal direction of a metal powder flux-cored wire which was produced experimentally by incorporating ultrafine powdery iron oxide according to the present invention and had no disconnection. However, no remarkable abnormality is observed in the outer skin portion and the flux portion regardless of the presence or absence of the intermediate annealing. The welding workability was also stable and good. That is, there is a close relationship between the wire drawability and the welding workability in the manufacturing process of the metal powder-based flux-cored wire, and the flux filling rate and the wall thickness of the outer skin are made uniform to prevent the wire from breaking, and the arc is stabilized. The amount generated is also reduced.
【００１３】本発明においてフラックス中に含有させる
超微粉末状の酸化鉄は、フラックスの流動性を良好に
して充填時の局部的な充填率の変動をなくし、充填時
及び伸線初期段階で外皮内壁に付着してその後の伸線加
工中の外皮金属と充填フラックスとの摩擦抵抗を小さく
し、中間焼鈍を行う場合には充填フラックスが焼結状
態になったとしても伸線加工中のフラックスを移動しや
すくして外皮部の延びに対するフラックス部の追従性を
良好にするように作用する。なお、上記中間焼鈍後のフ
ラックス部の追従性改善については、ミクロ的な観察及
び分析により金属粉粒子間に金属粉どうしの結合とは異
種の高酸素量の薄い焼結層が形成されていることが認め
られるので、この薄い焼結層が伸線加工によるフラック
ス部への変形圧力に対し脆弱な部分となることによる。
さらに、超微粉末状の酸化鉄を含有させることにより
溶滴が細粒化しアーク力をやや弱目になっていること
は、ワイヤ先端及び溶融プールからのスパッタ飛散を抑
え低スパッタ化にも有効に作用している。The ultrafine powdery iron oxide contained in the flux in the present invention improves the fluidity of the flux and eliminates the local fluctuation of the filling rate during filling, so that the outer skin is filled during filling and at the initial stage of wire drawing. When the intermediate flux is adhered to the inner wall to reduce the frictional resistance between the outer metal and the filling flux during wire drawing, and when the intermediate annealing is performed, the flux during wire drawing is reduced even if the filling flux is in a sintered state. It acts so as to facilitate movement and improve the followability of the flux portion with respect to the extension of the outer skin portion. In order to improve the followability of the flux portion after the intermediate annealing, a thin sintered layer having a high oxygen content different from the bonding of the metal powder particles is formed between the metal powder particles by microscopic observation and analysis. This is because the thin sintered layer becomes a fragile portion against the deformation pressure applied to the flux portion by the wire drawing process.
In addition, the inclusion of ultrafine powdered iron oxide causes the droplets to become finer and slightly weaken the arc force, which is effective in suppressing spatter scattering from the wire tip and the molten pool and reducing spatter. Is acting on.
【００１４】本発明では超微粉末状の酸化鉄の粒径を
１．０μｍ以下に限定した。この理由は微粉であればあ
るほどフラックス表面および鋼製外皮内面に付着させや
すく、少量でもってフラックスの流動性及び追従性を良
好にし断線防止及び溶滴の細粒化によるスパッタ低減に
効果的に作用する。粒径が１．０μｍよりも粗粒の場合
は、フラックス粒子の表面に付着させにくく断線防止効
果が十分に発揮できず、また酸化鉄による悪影響が現れ
アークが粗くなり、スパッタ量は多くなる。超微粉末状
の酸化鉄による上記効果はフラックス全重量に対して
０．２重量％以上含有させることにより得られる。しか
し、５．０重量％を超えると粗粒のミルスケール等の酸
化鉄を含有させた場合と同様にスパッタが多くなり、溶
接金属の酸素量も増加し衝撃値が低下する。In the present invention, the particle size of the ultrafine powdery iron oxide is limited to 1.0 μm or less. The reason for this is that the finer the powder, the easier it is to adhere to the surface of the flux and the inner surface of the steel shell, and even with a small amount it improves the fluidity and followability of the flux, effectively prevents wire breakage and effectively reduces spatter by atomizing droplets. To work. When the particle size is coarser than 1.0 μm, it is difficult to adhere to the surface of the flux particle and the effect of preventing disconnection cannot be sufficiently exerted, and the adverse effect of iron oxide appears to roughen the arc and increase the amount of spatter. The above effect of the ultrafine powdery iron oxide can be obtained by containing 0.2 wt% or more of the total flux. However, if it exceeds 5.0% by weight, spatter increases as in the case of containing iron oxide such as coarse-grained mill scale, the oxygen content of the weld metal also increases, and the impact value decreases.
【００１５】なお、超微粉末状の酸化鉄としてはＦｅ2
Ｏ3 が一般的であるが、ＦｅＯ，Ｆｅ3 Ｏ4 またはこれ
らの混合物でもよい。超微粉末状の酸化鉄の形状は潤滑
性のためにほぼ球型を呈していることが好ましいが、複
雑形状であっても本発明の効果は同等に得られる。超微
粉末状の酸化鉄をフラックス中に含有させる方法は他の
フラックス原料との直接混合或いは他のフラックス原料
を水ガラス等で造粒してから混合してもよい。As the ultrafine powdery iron oxide, Fe 2
O 3 is common, but may be FeO, Fe 3 O 4 or mixtures thereof. The shape of the ultrafine powdery iron oxide is preferably approximately spherical for lubricity, but the effect of the present invention can be obtained even if the shape is complicated. As a method of incorporating ultra-fine powdery iron oxide into the flux, the flux may be directly mixed with another flux raw material, or the other flux raw material may be granulated with water glass or the like and then mixed.
【００１６】次に、本発明による金属粉系フラックス入
りワイヤのフラックス充填率はワイヤ全重量に対して１
０〜３０重量％に限定した。この理由はフラックス充填
率が１０重量％未満では外皮部の肉厚が厚くなりワイヤ
溶融速度が遅く、また、溶滴が大きくなりスパッタ量が
多くなる。一方、３０重量％を超えると外皮部の肉厚が
必然的に薄くなりすぎて断線が発生しやすくなる。な
お、ワイヤ径としてはワイヤ溶融速度を速くし溶接能率
を上げるために１．０〜２．４mmの範囲とすることが好
ましい。Next, the flux filling rate of the metal powder type flux-cored wire according to the present invention is 1 with respect to the total weight of the wire.
It was limited to 0 to 30% by weight. The reason for this is that if the flux filling rate is less than 10% by weight, the wall thickness of the outer skin becomes thick and the wire melting speed becomes slow, and the droplets become large and the amount of spatter increases. On the other hand, when it exceeds 30% by weight, the wall thickness of the outer skin portion is inevitably too thin and the wire breakage easily occurs. The wire diameter is preferably in the range of 1.0 to 2.4 mm in order to increase the wire melting rate and the welding efficiency.
【００１７】さらに、本発明の金属粉系フラックス入り
ワイヤの断面は図１に示す従来一般的なものでよいが、
特に図１（ａ）に示すように鋼製外皮部に貫通した隙間
がないシームレスタイプの断面にすることにより、脱水
素のための高温度焼鈍を実施でき、極低水素化が可能と
なり多層盛溶接金属の耐割れ性が向上する。またシーム
レスタイプの断面にすることにより自動及びロボット溶
接装置において重要なワイヤ狙い位置の安定化及び良好
なワイヤ送給性が得られる。Further, the cross section of the metal powder-based flux-cored wire of the present invention may be the conventional one shown in FIG.
In particular, as shown in Fig. 1 (a), by using a seamless type cross-section with no gaps penetrating the steel outer shell, high temperature annealing for dehydrogenation can be performed, and extremely low hydrogen can be achieved, and multi-layer deposition is possible. The crack resistance of the weld metal is improved. In addition, by using a seamless type cross-section, it is possible to stabilize the wire aiming position, which is important in automatic and robot welding equipment, and to obtain good wire feedability.
【００１８】以上が本発明による金属粉系フラックス入
りワイヤの主要構成であるが、アーク安定化やすみ肉溶
接に使用する場合のビード形成性向上のために少量のス
ラグ形成剤を含有させることができる。Ｎａ2 Ｏ，Ｋ2
Ｏ，Ｌｉ2 Ｏ，Ｔｉ2 Ｏ，Ｓｉ2 Ｏ，Ｚｒ2 Ｏ，Ａｌ2
Ｏ3 ，ＭｇＯ等の酸化物、ＮａＦ，ＫＦ，Ｋ2 ＳｉＦ6
等の弗化物等の非金属物質を単体もしくは化合物の形態
でその総量が１０重量％を超えない範囲で添加すること
ができる。鋼製外皮としては軟鋼材が伸線加工性の面か
ら好ましいが、用途に応じて低合金鋼または高合金鋼を
用いることができる。The above is the main constitution of the metal powder-based flux-cored wire according to the present invention. A small amount of a slag forming agent may be contained in order to improve the bead forming property when used for arc stabilization and fillet welding. . Na 2 O, K 2
O, Li 2 O, Ti 2 O, Si 2 O, Zr 2 O, Al 2
O 3 , oxides such as MgO, NaF, KF, K 2 SiF 6
A non-metal substance such as a fluoride can be added in the form of a simple substance or a compound as long as the total amount thereof does not exceed 10% by weight. As the steel shell, a mild steel material is preferable from the viewpoint of wire drawing workability, but a low alloy steel or a high alloy steel can be used depending on the application.
【００１９】また本発明の金属粉系フラックス入りワイ
ヤを用いる場合のシールドガス組成をしては、ＣＯ2 ガ
スの他にＡｒ−ＣＯ2 混合ガス或いはＡｒガスも適用可
能である。Ａｒ−ＣＯ2 混合ガス或いはＡｒガスの場合
はＡｒガスによるアーク安定化作用が重畳されるのでさ
らにスパッタを低減できる。Further, as the shield gas composition when the metal powder type flux-cored wire of the present invention is used, an Ar—CO 2 mixed gas or an Ar gas can be applied in addition to the CO 2 gas. For Ar-CO 2 mixed gas or Ar gas can be reduced further sputtering since the arc stabilizing effect of the Ar gas is superimposed.
【００２０】[0020]
【実施例】以下に実施例により本発明の効果をさらに具
体的に示す。表１に示す帯鋼及び鋼管を鋼製外皮として
表２に示す金属粉系フラックス入りワイヤを試作した。
帯鋼による試作ワイヤ（Ｗ１，２，８，９）はフラック
ス（非造粒フラックス）充填後のワイヤ径が約４mm、最
終ダイスの伸線速度は５００ｍ/minである。鋼管による
試作ワイヤ（Ｗ２〜７，Ｗ１０〜１５）はフラックス
（造粒フラックス）充填前に鋼管を所定の肉厚となるよ
うに伸線後、特開昭５９−２２６９７号公報に見られる
ような振動充填方式により充填後、中間伸線で３．５mm
まで縮径し、同ワイヤ径において中間焼鈍（６５０℃）
し、仕上げ伸線の最終ダイスの伸線速度は仕上がり径
１．２mmの場合は８００ｍ/min、１．６mmの場合は６０
０ｍ/min、２．０mmの場合は５００ｍ/minで行った。な
お、仕上がり径２．０mmの試作ワイヤ（Ｗ７，Ｗ１５）
については中間焼鈍は実施しなかった。超微粉末状の酸
化鉄は充填前に予め乾式混合によりそれぞれのフラック
スに含有させた。本発明ワイヤ（Ｗ１〜７）の仕上がり
量はそれぞれ約５００kgずつである。ワイヤ試作状況と
表３に示す試験条件による溶接試験結果とを表４にまと
めて示す。EXAMPLES The effects of the present invention will be more specifically described below with reference to examples. The metal powder flux-cored wire shown in Table 2 was experimentally manufactured by using the steel strip and the steel pipe shown in Table 1 as a steel shell.
The trial wire (W1, 2, 8, 9) made of strip steel has a wire diameter of about 4 mm after filling with flux (non-granulating flux), and the drawing speed of the final die is 500 m / min. Prototype wires (W2 to 7, W10 to 15) made of a steel pipe are drawn into a predetermined thickness before filling the flux (granulating flux), and as shown in JP-A-59-22697. 3.5mm with intermediate wire drawing after filling by vibration filling method
The diameter of the wire is reduced to an intermediate annealing (650 ° C) at the same wire diameter.
However, the drawing speed of the final die for finish drawing is 800 m / min for a finished diameter of 1.2 mm, and 60 for a finished diameter of 1.6 mm.
In case of 0 m / min and 2.0 mm, it was performed at 500 m / min. A trial wire with a finished diameter of 2.0 mm (W7, W15)
No intermediate annealing was performed. The ultrafine powdery iron oxide was contained in each flux by dry mixing in advance before filling. The finished amount of each of the wires (W1 to 7) of the present invention is about 500 kg. Table 4 summarizes the wire trial production conditions and the welding test results under the test conditions shown in Table 3.
【００２１】表中試験Ｎｏ．１〜７が本発明例、Ｎｏ．
８〜１５が比較例である。本発明例の試験Ｎｏ．１〜７
（Ｗ１〜７）は断線がなく、アークが安定しスパッタ量
が少なく、溶着金属試験の衝撃値も高い。また中間焼鈍
を実施したシームレスタイプのワイヤ断面をもつＷ３〜
６による拡散性水素量は極めて低く、多層盛による溶接
金属の耐割れ性も向上している。Test No. in the table. Nos. 1 to 7 are examples of the present invention.
8 to 15 are comparative examples. Test No. of the present invention example 1-7
In (W1 to 7), there is no disconnection, the arc is stable, the amount of spatter is small, and the impact value of the deposited metal test is high. In addition, W3 with seamless type wire cross-section that has undergone intermediate annealing
The amount of diffusible hydrogen due to No. 6 is extremely low, and the crack resistance of the weld metal due to the multi-layer deposit is also improved.
【００２２】比較例中試験Ｎｏ．８，１５（Ｗ８，１
５）は超微粉末状の酸化鉄を含有させないために断線が
多発した。試験Ｎｏ．９（Ｗ９）は超微粉末状の酸化鉄
の含有量が少なすぎるために断線し、またアークが不安
定でスパッタが多発した。試験Ｎｏ．１０（Ｗ１０）は
充填率が少なすぎるためにワイヤ溶融速度が遅く、また
溶滴が大きくスパッタが多発した。試験Ｎｏ．１１（Ｗ
１１）は微粉酸化鉄の粒径が大きいために超微粉末状の
酸化鉄による本発明による効果が得られず断線が多発し
た。試験Ｎｏ．１２（Ｗ１２）は超微粉末状の酸化鉄の
含有量が多すぎるためにアークが不安定でスパッタが多
発、さらに溶着金属試験の衝撃値が低下した。試験Ｎ
ｏ．１３（Ｗ１３）は金属粉の含有量が少なすぎるため
にワイヤ溶着効率が小さい。試験Ｎｏ．１４（Ｗ１４）
は充填率が多すぎて断線が多発した。Comparative Example Test No. 8, 15 (W8, 1
In the case of 5), since the ultrafine powdery iron oxide was not contained, disconnection occurred frequently. Test No. In No. 9 (W9), the content of the ultrafine powdery iron oxide was too small and the wire was broken, and the arc was unstable and spatter frequently occurred. Test No. In No. 10 (W10), the filling rate was too small, the wire melting rate was slow, and the droplets were large and spatter frequently occurred. Test No. 11 (W
In 11), since the particle size of the finely divided iron oxide was large, the effect of the present invention due to the ultrafine powdery iron oxide was not obtained, and disconnection frequently occurred. Test No. In No. 12 (W12), the content of ultrafine iron oxide powder was too large, so the arc was unstable and spatter frequently occurred, and the impact value of the deposited metal test was lowered. Test N
o. In No. 13 (W13), the content of the metal powder is too small, and therefore the wire welding efficiency is low. Test No. 14 (W14)
Was filled with too much and had many disconnections.
【００２３】[0023]
【表１】 [Table 1]
【００２４】[0024]
【表２】 [Table 2]
【００２５】[0025]
【表３】 [Table 3]
【００２６】[0026]
【表４】 [Table 4]
【００２７】[0027]
【発明の効果】以上のように本発明は、生産性向上とと
もに溶接性能も良好な金属粉系のガスシールドアーク溶
接用フラックス入りワイヤを提供するものであり、溶接
の高能率化に寄与できる。INDUSTRIAL APPLICABILITY As described above, the present invention provides a flux-cored wire for gas shielded arc welding of metal powder, which has improved productivity and good welding performance, and can contribute to higher welding efficiency.
【図１】（ａ），（ｂ），（ｃ）は本発明による金属粉
系フラックス入りワイヤの断面形状例を示す図である。1 (a), (b) and (c) are diagrams showing examples of cross-sectional shapes of a metal powder-based flux-cored wire according to the present invention.
【図２】本発明による金属粉系フラックス入りワイヤの
長手方向の断面状態の観察結果を示す図である。FIG. 2 is a diagram showing an observation result of a cross-sectional state in the longitudinal direction of the metal powder-based flux-cored wire according to the present invention.
【図３】金属粉系フラックス入りワイヤにおける断線発
生部近傍のワイヤの長手方向の断面状態の観察結果を示
す図である。FIG. 3 is a diagram showing an observation result of a cross-sectional state in the longitudinal direction of a wire in the vicinity of a wire breakage occurrence portion in a metal powder flux-cored wire.
【図４】実施例における多層盛溶接金属の耐割れ性試験
に供した試験板の開先形状及び積層法を示す図である。FIG. 4 is a view showing a groove shape and a laminating method of a test plate used for a crack resistance test of a multilayer weld metal in Examples.
【符号の説明】 １ 鋼製外皮 ２ フラックス ３ 鋼製外皮部の貫通した隙間 ４ フラックス部に生じた亀裂 ５ 塊状化したフラックス ６ 試験板（母材） ７ 裏当材 ８ 拘束板 ９ 溶接金属[Explanation of symbols] 1 steel outer shell 2 flux 3 gap penetrated through steel outer shell 4 cracks in flux 5 solidified flux 6 test plate (base material) 7 backing material 8 restraint plate 9 weld metal
Claims (2)
８５重量％以上含有するフラックスを充填してなるガス
シールドアーク溶接用フラックス入りワイヤにおいて、
粒径１．０μｍ以下の超微粉末状の酸化鉄を０．２〜
５．０重量％含有するフラックスをワイヤ全重量に対し
て１０〜３０重量％充填したことを特徴とするガスシー
ルドアーク溶接用フラックス入りワイヤ。1. A flux-cored wire for gas shield arc welding, comprising a steel outer shell filled with a flux containing 85% by weight or more of a metal powder composed mainly of iron powder,
0.2 ~ 0.5 μm or less of ultrafine powdered iron oxide
A flux-cored wire for gas shield arc welding, characterized in that a flux containing 5.0 wt% is filled in an amount of 10 to 30 wt% with respect to the total weight of the wire.
８５重量％以上含有するフラックスを充填してなるガス
シールドアーク溶接用フラックス入りワイヤにおいて、
粒径１．０μｍ以下の超微粉末状の酸化鉄を０．２〜
５．０重量％含有するフラックスをワイヤ全重量に対し
て１０〜３０重量％充填し、かつ鋼製外皮部に貫通した
隙間がないことを特徴とするガスシールドアーク溶接用
フラックス入りワイヤ。2. A flux-cored wire for gas shield arc welding, comprising a steel outer shell filled with a flux containing 85% by weight or more of metal powder mainly composed of iron powder.
0.2 ~ 0.5 μm or less of ultrafine powdered iron oxide
A flux-cored wire for gas shield arc welding, characterized in that a flux containing 5.0 wt% is filled in an amount of 10 to 30 wt% with respect to the total weight of the wire, and there is no gap penetrating the steel outer shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9280395A JPH08290294A (en) | 1995-04-18 | 1995-04-18 | Flux cored wire for gas shielded arc welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9280395A JPH08290294A (en) | 1995-04-18 | 1995-04-18 | Flux cored wire for gas shielded arc welding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08290294A true JPH08290294A (en) | 1996-11-05 |
Family
ID=14064580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9280395A Pending JPH08290294A (en) | 1995-04-18 | 1995-04-18 | Flux cored wire for gas shielded arc welding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08290294A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015518427A (en) * | 2012-04-17 | 2015-07-02 | ホバート ブラザーズ カンパニー | System and method for welding electrodes |
-
1995
- 1995-04-18 JP JP9280395A patent/JPH08290294A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015518427A (en) * | 2012-04-17 | 2015-07-02 | ホバート ブラザーズ カンパニー | System and method for welding electrodes |
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