JP3822175B2 - Flux-cored wire for gas shielded arc welding - Google Patents
Flux-cored wire for gas shielded arc welding Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は、ウォッシュプライマ、無機ジンクプライマ等のプライマを塗布した鋼板のすみ肉溶接において、スパッタの発生量の増加およびビード形状を劣化させることなく、優れた耐ピット性を得ることができる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。
【０００２】
【従来の技術】
造船や橋梁分野では全溶接長に占めるすみ肉溶接の比率が高く、それら鋼材の多くには製造期間中の発錆防止のために無機ジンクプライマやウォッシュプライマが塗布されているため、ビード表面にピットが発生して問題となる。
【０００３】
特にウォッシュプライマ塗布鋼板のすみ肉溶接においては、溶接熱によるウォッシュプライマの熱分解ガスの発生量が多く、ピットが発生しやすく、このため予めプライマを除去して溶接したり、溶接速度を遅くして行うなど能率低下が問題となる。また、無機ジンクプライマ塗布鋼板についても、プライマ塗布膜厚のばらつきやＴ字すみ肉の上板端面及びその近傍にはプライマが厚くたまりやすく、このような部材のすみ肉溶接ではピットが多発する。
【０００４】
従来のプライマ塗布鋼板対応のガスシールドアーク溶接用フラックス入りワイヤとして、充填フラックス中に水素源化合物を含有させて、溶融金属からのガスの浮上を促進するという高水素ＴｉＯ2系ガスシールドアーク溶接用フラックス入りワイヤがある（例えば、特許文献１）。しかし、高水素系ガスシールドアーク溶接用フラックス入りワイヤの場合、十分な耐プライマ性を得るためには溶接速度を３０ｃｍ／ｍｉｎ程度以下に遅くしなければならず溶接能率が低い。また溶接金属中の水素量が多くなるため耐割れ性の観点より適用する板厚に制限があり、さらに水素源化合物に起因してアーク状態が粗くスパッタ発生量が多くなるという欠点がある。
【０００５】
また、金属弗化物や金属炭酸塩を含有させた低水素から中水素系のＴｉＯ2系ガスシールドアーク溶接用フラックス入りワイヤの提案がある（例えば、特許文献２）。しかし、このガスシールドアーク溶接用フラックス入りワイヤではビード形状が十分ではない。
【０００６】
また、高速溶接で優れたビード形状および作業性を得ることを目的とした技術が提案されている（例えば、特許文献３）。しかし、本技術ではプライマ塗布鋼板に適用した場合の耐ピット性は十分ではない。
【０００７】
さらに、ＺｒＯ2、ＳｉＯ2およびＴｉＯ2の総量とＦｅＯおよびＭｎＯの総量とＮａ2ＯおよびＫ2Ｏの総量を限定してプライマ塗布鋼板に適用した場合の耐ピット性を良好にするガスシールドアーク溶接用フラックス入りワイヤの提案がある（例えば、特許文献４）。しかし、このガスシールドアーク溶接用フラックス入りワイヤでは耐ピット性に有効であってもビード形状が劣化しやすい傾向があった。
【０００８】
【特許文献１】
特開昭６４−５６９９号公報
【特許文献２】
特開平３−１８０２９８号公報
【特許文献３】
特開平９−９４６９２号公報
【特許文献４】
特開２０００−４２７８７号公報
【０００９】
【発明が解決しようとする課題】
本発明は、プライマ塗布鋼板のすみ肉溶接において、スパッタの発生量が少なく、優れた耐ピット性が得られ、さらに良好なビード形状を得ることができる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。
【００１０】
【課題を解決するための手段】
本発明者らは、前記課題を解決するために、種々のガスシールドアーク溶接用フラックス入りワイヤを試作して、プライマ塗布鋼板のすみ肉溶接に適用し、スパッタ発生量、耐ピット性およびビード形状におよぼす影響を調べた。その結果、フラックス中に適量のＺｒＯ2、ＴｉＯ2およびＳｉＯ2を含有させ、Ｍｎ／Ｓｉ値を適正にすることによって、スパッタの発生量が少なく、優れた耐ピット性が得られ、さらに良好なビード形状を得ることができることを見出し、本発明を完成した。
【００１１】
【課題を解決するための手段】
本発明の要旨は、鋼製外皮内に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、ワイヤ全質量に対する質量％で、ＺｒＯ２を０．７〜１．５％、Ｔｉ酸化物がＴｉＯ２換算値で１．５〜３．５％、ＳｉＯ２を０．５〜１．０％、前記ＺｒＯ ２ 、Ｔｉ酸化物のＴｉＯ ２ 換算値及びＳｉＯ ２ を含むスラグ形成剤成分の合計が４〜５．７２％含有し、金属および合金の形で添加されるＳｉおよびＭｎのＭｎ／Ｓｉが２．５〜４．０であることを特徴とする。
【００１３】
【発明の実施の形態】
以下に本発明を詳細に説明する。本発明者らは、種々のガスシールドアーク溶接用フラックス入りワイヤを試作して、プライマ塗布鋼板のすみ肉溶接に適用し、スパッタ発生量、耐ピット性およびビード形状におよぼす影響を調べた。プライマ塗布鋼板とは、無機ジンクプライマやウォッシュプライマ等のプライマが塗布されている鋼板である。
【００１４】
プライマ塗布鋼板をアーク溶接する際には、溶接時のアーク熱によってプライマが分解されＨ２やＣＯ等のガスが発生する。これらの発生したガスは耐ピット性等に悪影響を与える。
【００１５】
溶接中に発生するガスの放出には溶接金属の粘性及びスラグの粘性等の影響が大きい。溶接時の溶接金属の粘性及びスラグの粘性等を適正にし、かつ、アーク安定性、スラグ被包性等を適正にすべく、フラックス中に適量のＺｒＯ2、ＴｉＯ2およびＳｉＯ2を含有させ、Ｍｎ／Ｓｉ値を適正にすることによって、スパッタの発生量が少なく、優れた耐ピット性が得られ、さらに良好なビード形状を得ることができることを見出した。
【００１６】
本発明のガスシールドアーク溶接用フラックス入りワイヤの成分組成およびその含有量の限定理由について説明する。なお、以下に述べる各成分組成の含有量は、ワイヤ全質量に対する質量％で示す。
【００１７】
ＺｒＯ2は、ジルコンサンドおよび酸化ジルコニウム等より添加され、少量でスラグ被包性を改善し、ビード形状を改善するスラグ形成剤として作用する。ＺｒＯ2を添加することによりスラグの凝固温度が高くなり、スラグの凝固が早くなるが、他のスラグ形成剤と比較して、その添加量が同量であっても生成スラグの厚みが薄くなるので、耐ピット性に有効である。０．７％未満であると、スラグの凝固温度は低下し凝固は遅くなるので耐ピット性に有効と思われるが、スラグ厚みが増加するので、耐ピット性が悪くなる。一方、１．５％を超えると、スパッタ発生量が増加するとともに、ビードにスラグが均一に被包し難くなるので、スラグ除去が困難となり、溶接作業性が悪くなる。
【００１８】
ＴｉＯ2は、スラグ形成剤の主成分であり、Ｔｉ酸化物のルチール、酸化チタン、チタン酸ソーダ、チタンスラグ、イルミナイト等から添加される。ビード全体を均一に包被して、ビード形状を整える役目を果たす。また、アークを持続して安定させ、スパッタ発生量を低減させる効果がある。Ｔｉ酸化物がＴｉＯ2換算値で１．５％未満であると、スラグ生成量が不足して、ビードを均一に包被できずに、ビード形状を美麗に整えることができなくなる。また、アークを安定させる効果がなくなり、スパッタ発生量も増加する。一方、３．５％を超えると、アークは安定し、スパッタ発生量は減少するが、スラグ厚みが厚くなり、ガスの放出が阻害されるので、耐ピット性が悪くなる。
【００１９】
ＳｉＯ2は、珪砂、ジルコンサンド等より添加され、スラグ形成剤として作用し、少量でスラグ粘性を大きくする効果がある。０．５％未満であると、スラグ形成剤としての効果が無くスラグ被包性が悪くなり、ビード形状が劣化する。一方、１．０％を超えると、スラグの粘性が増大し、ガスの放出が阻害されるので、耐ピット性が悪くなる。
【００２０】
Ｍｎ／Ｓｉは、溶接金属の粘性に影響する。Ｍｎは金属マンガン、フェロマンガン等より添加され、Ｓｉは金属シリコン、フェロシリコン等から添加される。Ｍｎ／Ｓｉが大きくなれば溶接金属の粘性が低下し、逆にＭｎ／Ｓｉが小さくなると溶接金属の粘性は高くなる。溶接金属の粘性を低くすると溶接金属中から発生するガスを早く抜けさせるので、耐ピット性を向上させることができる。Ｍｎ／Ｓｉが２．５未満であると、溶接金属の粘性が高くなるので、ガスが抜けにくくなり、耐ピット性が悪くなる。一方、４．０を超えると、逆に溶接金属の粘性が低くなり、ビード形状が凸になる。また、ＭｎおよびＳｉは脱酸剤、強度向上等のために添加されるが、Ｓｉは０．２〜１．３％、Ｍｎは１．３〜２．９％の範囲内であることが望ましい。なお、その他の金属粉として、溶着量の増加や機械的性質の改善のために鉄粉、Ａｌ、Ｍｇ、Ｔｉ等をワイヤ全質量に対する質量％で合計８％以下の範囲で添加しても良い。
【００２１】
スラグ形成剤は、アーク安定性、スラグ被包性等に影響する。成分としては、ＺｒＯ２、ＴｉＯ２、ＳｉＯ２、ＦｅＯ、Ｋ２Ｏ、Ｎａ２Ｏ等があるが、これらのスラグ形成成分の合計が４％未満であると、スラグ被包性が悪くなり、ビード形状が劣化する。一方、スラグ形成剤成分の合計が５．７２％を超えると、スラグ厚みが厚くなり、ガスの放出が阻害されるので、耐ピット性が悪くなる。本発明のガスシールドアーク溶接用ワイヤの断面形状は、開口部のないシームレスフラックス入りワイヤおよび各種形状の合わせ目有りのフラックス入りワイヤ、いずれをも用いることができる。
【００２２】
【実施例】
以下、実施例により本発明の効果をさらに詳細に説明する。
【００２３】
まず、鋼製外皮にＪＩＳ Ｇ３１４１ ＳＰＣＣ帯鋼を使用し、表１に示す各種フラックスを充填し、伸線して１．２ｍｍ径のガスシールドアーク溶接用フラックス入りワイヤを試作した。
【００２４】
次に、これらのワイヤを使用して、板厚１２ｍｍの無機ジンクプライマ塗布鋼板（ＪＩＳ Ｇ３１０６ ＳＭ４９０Ａ、プライマ膜厚３５〜４０μｍ）をＴ字すみ肉試験体（長さ１０００ｍｍ）とし、片側づつ両側に表２に示す溶接条件で水平すみ肉溶接を行い、ピット発生数、スパッタ発生量、スラグ剥離性およびビード形状を調査した。スパッタ発生量の測定は、銅製の捕集箱を用いて発生したスパッタ全量を捕集し、１分間当たりの発生量に換算した。なお、プライマ塗布鋼板でのスパッタ発生量は４ｇ／ｍｉｎ以下が良好である。それらの調査結果を表３にまとめて示す。
【００２５】
【表１】
【表２】
【表３】
表３中Ｎｏ．１〜８が本発明例、Ｎｏ．９〜１８は比較例である。本発明例であるＮｏ．１〜８は、ＺｒＯ２、ＴｉＯ２、ＳｉＯ２およびスラグ剤成分の合計量が適量でＭｎ／Ｓｉも適正であるので、ピットの発生はなく、スパッタ発生量が少なく、スラグ剥離性およびビード形状も良好で、極めて満足な結果であった。
【００２９】
比較例中Ｎｏ．９は、ＺｒＯ２が少ないので、スラグの厚みが増加してガス抜けが悪くなりピットが発生した。
【００３０】
Ｎｏ．１０は、ＺｒＯ２が多いので、スパッタ発生量が多く、ビードにスラグが被包しない部分が発生してスラグ剥離性が不良となった。
【００３１】
Ｎｏ．１１は、ＴｉＯ２が少ないので、アークが不安定でスパッタ発生量が多く、またスラグがビードを均一に被包できずビード形状が不良でスラグ剥離性も悪かった。
【００３２】
Ｎｏ．１２は、ＴｉＯ２が多いので、ピットが多数発生した。
【００３３】
Ｎｏ．１３は、ＳｉＯ２が少ないので、スラグ被包性が悪くなり、ビード形状が不良であった。
【００３４】
Ｎｏ．１４は、ＳｉＯ２が多いので、スラグ粘性が増大し、ガスの放出が阻害されたのでピットが発生した。
【００３５】
Ｎｏ．１５は、Ｍｎ／Ｓｉが低いので、溶接金属の粘性が高くなり、ガス抜けが悪くなりピットが発生した。
【００３６】
Ｎｏ．１６は、Ｍｎ／Ｓｉが低いので、溶接金属の粘性が低くなり、ビード形状が凸になった。
【００３７】
Ｎｏ．１７は、スラグ形成剤成分の合計が高いので、スラグ厚みが厚くなり、ガスの放出が阻害されてピットが発生した。また、Ｍｎ／Ｓｉが高いので、溶接金属の粘性が低くなり、ビード形状も凸になった。
【００３８】
Ｎｏ．１８は、スラグ形成剤成分の合計が低いので、スラグ被包性が悪くビード形状が不良であった。また、Ｍｎ／Ｓｉが低いので、溶接金属の粘性が高くなり、ガス抜けが悪くなりピットも発生した。
【００３９】
【発明の効果】
以上詳述したように、本発明のガスシールドアーク溶接用フラックス入りワイヤによれば、プライマ塗布鋼板のすみ肉溶接においても耐ピット性が極めて良好であり、スパッタの発生量が少なく、さらに良好なスラグ剥離性およびビード形状を得ることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention provides a gas shield capable of obtaining excellent pit resistance without increasing spatter generation and bead shape deterioration in fillet welding of steel sheets coated with a primer such as a wash primer or an inorganic zinc primer. The present invention relates to a flux-cored wire for arc welding.
[0002]
[Prior art]
In the shipbuilding and bridge fields, fillet welds account for a large percentage of the total weld length, and many of these steel materials are coated with inorganic zinc primer and wash primer to prevent rusting during production. A pit occurs and becomes a problem.
[0003]
Especially in fillet welding of steel sheets coated with wash primer, there is a large amount of pyrolysis gas generated in the wash primer due to welding heat, and pits are likely to occur, so this can be done by removing the primer in advance or reducing the welding speed. Efficiency reduction is a problem. In addition, in the case of an inorganic zinc primer coated steel sheet, the primer tends to accumulate thickly at the primer coating film thickness variation and at the upper plate end surface of the fillet of the T-shaped fillet and in the vicinity thereof, and fillet welding of such members frequently causes pits.
[0004]
As a conventional primer coating the steel sheet corresponding gas shielded arc welding flux cored wire, it contains a hydrogen source compound in the filled flux, a flying height hydrogen TiO 2 based gas shielded arc welding of promoting gas from the molten metal There is a flux cored wire (for example, Patent Document 1). However, in the case of a flux cored wire for high hydrogen gas shielded arc welding, in order to obtain sufficient primer resistance, the welding speed must be reduced to about 30 cm / min or less, and the welding efficiency is low. Further, since the amount of hydrogen in the weld metal increases, there is a limitation in the plate thickness to be applied from the viewpoint of crack resistance, and further, there is a disadvantage that the arc state is rough and the amount of spatter generated increases due to the hydrogen source compound.
[0005]
In addition, there has been proposed a flux-cored wire for low to medium hydrogen TiO 2 gas shielded arc welding containing metal fluoride or metal carbonate (for example, Patent Document 2). However, the bead shape is not sufficient in the flux-cored wire for gas shielded arc welding.
[0006]
In addition, a technique for obtaining an excellent bead shape and workability by high-speed welding has been proposed (for example, Patent Document 3). However, this technology does not have sufficient pit resistance when applied to a primer coated steel sheet.
[0007]
Further, a gas shielded arc having good pit resistance when applied to a primer coated steel sheet by limiting the total amount of ZrO 2 , SiO 2 and TiO 2 , the total amount of FeO and MnO, and the total amount of Na 2 O and K 2 O. There is a proposal of a flux-cored wire for welding (for example, Patent Document 4). However, with this flux-cored wire for gas shielded arc welding, the bead shape tends to deteriorate even if it is effective for pit resistance.
[0008]
[Patent Document 1]
Japanese Patent Laid-Open No. 64-5699 [Patent Document 2]
Japanese Patent Laid-Open No. 3-180298 [Patent Document 3]
Japanese Patent Laid-Open No. 9-94692 [Patent Document 4]
JP 2000-42787 A [0009]
[Problems to be solved by the invention]
The present invention provides a flux-cored wire for gas shielded arc welding in which the amount of spatter generated in fillet welding of a primer coated steel sheet is small, excellent pit resistance is obtained, and a better bead shape can be obtained. For the purpose.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the inventors have made various types of flux-cored wires for gas shielded arc welding and applied them to fillet welding of primer-coated steel sheets. Spatter generation amount, pit resistance and bead shape The effect on selenium was investigated. As a result, by containing appropriate amounts of ZrO 2 , TiO 2 and SiO 2 in the flux and making the Mn / Si value appropriate, the amount of spatter generated is reduced, and excellent pit resistance is obtained. The inventors have found that a bead shape can be obtained and completed the present invention.
[0011]
[Means for Solving the Problems]
The gist of the present invention is that, in a flux-cored wire for gas shielded arc welding in which a steel sheath is filled with a flux, the mass percentage is based on the total mass of the wire, ZrO 2 is 0.7 to 1.5%, Ti oxide Is a TiO 2 equivalent value of 1.5 to 3.5%, SiO 2 is 0.5 to 1.0%, the ZrO 2 , the TiO 2 equivalent value of the Ti oxide, and the sum of the slag former components containing SiO 2 Is contained in an amount of 4 to 5.72% , and Mn / Si of Si and Mn added in the form of metals and alloys is 2.5 to 4.0.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described in detail below. The inventors of the present invention have made various types of flux-cored wires for gas shielded arc welding and applied them to fillet welding of primer-coated steel sheets, and investigated the effects on spatter generation, pit resistance, and bead shape. The primer coated steel sheet is a steel sheet coated with a primer such as an inorganic zinc primer or a wash primer.
[0014]
When arc welding the primer coated steel sheet, the primer is decomposed by arc heat at the time of welding, and gases such as H 2 and CO are generated. These generated gases adversely affect pit resistance and the like.
[0015]
The release of gas generated during welding is greatly affected by the viscosity of the weld metal and the viscosity of the slag. An appropriate amount of ZrO 2 , TiO 2 and SiO 2 is contained in the flux in order to optimize the viscosity of the weld metal and the slag at the time of welding and to make the arc stability, slag encapsulation, etc. appropriate, It has been found that by making the Mn / Si value appropriate, the amount of spatter generated is small, excellent pit resistance is obtained, and a better bead shape can be obtained.
[0016]
The component composition of the flux-cored wire for gas shielded arc welding of the present invention and the reason for limiting the content thereof will be described. In addition, content of each component composition described below is shown by the mass% with respect to the wire total mass.
[0017]
ZrO 2 is added from zircon sand, zirconium oxide, and the like, and acts as a slag forming agent that improves the slag encapsulating property and improves the bead shape with a small amount. By adding ZrO 2 , the solidification temperature of the slag is increased and the solidification of the slag is accelerated, but the thickness of the generated slag is reduced even if the addition amount is the same as that of other slag forming agents. Therefore, it is effective for pit resistance. If it is less than 0.7%, the solidification temperature of the slag is lowered and the solidification is slow, so it seems effective for the pit resistance, but the slag thickness increases, so the pit resistance is deteriorated. On the other hand, if it exceeds 1.5%, the amount of spatter generated increases, and it becomes difficult to uniformly encapsulate the slag in the bead, so it becomes difficult to remove the slag and the workability of welding deteriorates.
[0018]
TiO 2 is the main component of the slag forming agent and is added from Ti oxide rutile, titanium oxide, sodium titanate, titanium slag, illuminite, and the like. Covers the entire bead uniformly and plays the role of adjusting the bead shape. In addition, the arc is sustained and stabilized, and the amount of spatter generated is reduced. When the Ti oxide is less than 1.5% in terms of TiO 2 , the amount of slag produced is insufficient, and the beads cannot be uniformly encapsulated, and the bead shape cannot be adjusted beautifully. Further, the effect of stabilizing the arc is lost, and the amount of spatter generated increases. On the other hand, if it exceeds 3.5%, the arc becomes stable and the amount of spatter is reduced, but the slag thickness is increased and the release of gas is hindered, resulting in poor pit resistance.
[0019]
SiO 2 is added from silica sand, zircon sand or the like, acts as a slag forming agent, and has the effect of increasing the slag viscosity with a small amount. If it is less than 0.5%, there will be no effect as a slag forming agent, and the slag encapsulation will deteriorate, and the bead shape will deteriorate. On the other hand, if it exceeds 1.0%, the viscosity of the slag increases and the gas release is inhibited, so that the pit resistance is deteriorated.
[0020]
Mn / Si affects the viscosity of the weld metal. Mn is added from metallic manganese, ferromanganese, or the like, and Si is added from metallic silicon, ferrosilicon, or the like. As Mn / Si increases, the viscosity of the weld metal decreases. Conversely, when Mn / Si decreases, the viscosity of the weld metal increases. When the viscosity of the weld metal is lowered, the gas generated from the weld metal is quickly released, so that the pit resistance can be improved. When Mn / Si is less than 2.5, the viscosity of the weld metal is increased, so that it is difficult for gas to escape and pit resistance is deteriorated. On the other hand, if it exceeds 4.0, the viscosity of the weld metal becomes low and the bead shape becomes convex. Mn and Si are added for deoxidation, strength improvement, etc., but Si is preferably in the range of 0.2 to 1.3% and Mn in the range of 1.3 to 2.9%. . As other metal powders, iron powder, Al, Mg, Ti, etc. may be added within a range of 8% or less in terms of mass% based on the total mass of the wire in order to increase the amount of welding or improve mechanical properties. .
[0021]
The slag forming agent affects arc stability, slag encapsulation, and the like. Ingredients include ZrO 2 , TiO 2 , SiO 2 , FeO, K 2 O, Na 2 O, etc. If the total of these slag forming components is less than 4%, the slag encapsulation will be poor, The bead shape deteriorates. On the other hand, when the total of the slag forming agent components exceeds 5.72 %, the slag thickness is increased and the gas release is hindered, resulting in poor pit resistance. As the cross-sectional shape of the gas shielded arc welding wire of the present invention, any of a seamless flux-cored wire without an opening and a flux-cored wire with joints of various shapes can be used.
[0022]
【Example】
Hereinafter, the effect of the present invention will be described in more detail with reference to examples.
[0023]
First, JIS G3141 SPCC band steel was used for the steel outer sheath, filled with various fluxes shown in Table 1, and drawn to produce a 1.2 mm diameter flux-cored wire for gas shielded arc welding.
[0024]
Next, using these wires, an inorganic zinc primer coated steel sheet (JIS G3106 SM490A, primer film thickness 35-40 μm) having a thickness of 12 mm is used as a T-shaped fillet specimen (length 1000 mm), and one side is provided on each side. Horizontal fillet welding was performed under the welding conditions shown in Table 2, and the number of pits generated, the amount of spatter generated, the slag peelability, and the bead shape were investigated. For the measurement of the amount of spatter generated, the total amount of spatter generated using a copper collection box was collected and converted to the amount generated per minute. In addition, the amount of spatter generation in the primer coated steel sheet is preferably 4 g / min or less. The survey results are summarized in Table 3.
[0025]
[Table 1]
[Table 2]
[Table 3]
No. in Table 3 1-8 are examples of the present invention, No.1. 9 to 18 are comparative examples. No. which is an example of the present invention. In Nos. 1 to 8 , since the total amount of ZrO 2 , TiO 2 , SiO 2 and the slag agent component is appropriate and Mn / Si is also appropriate, pits are not generated, the amount of spatter generation is small, slag peelability and bead shape The results were also very satisfactory.
[0029]
No. in the comparative examples. No. 9 had less ZrO 2 , so that the thickness of the slag increased, resulting in poor gas escape and pits.
[0030]
No. No. 10 has a large amount of ZrO 2 , so that a large amount of spatter was generated, and a portion where the slag was not encapsulated occurred in the bead, resulting in poor slag removability.
[0031]
No. No. 11 had a small amount of TiO 2 , so that the arc was unstable and the amount of spatter was large, and the slag could not encapsulate the beads uniformly, and the bead shape was poor and the slag peelability was poor.
[0032]
No. No. 12 had a large amount of TiO 2 , so many pits were generated.
[0033]
No. No. 13 had less SiO 2 , so the slag encapsulation was poor and the bead shape was poor.
[0034]
No. No. 14 had a large amount of SiO 2 , so the slag viscosity increased and the release of gas was inhibited, so pits were generated.
[0035]
No. In No. 15 , since Mn / Si was low, the viscosity of the weld metal was increased, gas escape was worsened, and pits were generated.
[0036]
No. In No. 16 , since Mn / Si was low, the viscosity of the weld metal was low, and the bead shape was convex.
[0037]
No. In No. 17 , since the total of the slag forming agent components was high, the slag thickness was increased, and the release of gas was hindered to generate pits. Moreover, since Mn / Si was high, the viscosity of the weld metal was lowered, and the bead shape was also convex.
[0038]
No. No. 18 had a low slag encapsulating property and a poor bead shape because the total of the slag forming agent components was low. Moreover, since Mn / Si was low, the viscosity of the weld metal was increased, gas escape was worsened, and pits were generated.
[0039]
【The invention's effect】
As described above in detail, according to the flux-cored wire for gas shielded arc welding of the present invention, the pit resistance is extremely good even in the fillet welding of the primer coated steel sheet, the amount of spatter generated is small, and further better. Slag peelability and bead shape can be obtained.
Claims (1)
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| JP2003034195A JP3822175B2 (en) | 2003-02-12 | 2003-02-12 | Flux-cored wire for gas shielded arc welding |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2003034195A JP3822175B2 (en) | 2003-02-12 | 2003-02-12 | Flux-cored wire for gas shielded arc welding |
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| JP3822175B2 true JP3822175B2 (en) | 2006-09-13 |
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