JP6786431B2 - Carbon-based flux-cored wire for carbon dioxide shield arc welding - Google Patents
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本発明は、建築、橋梁、造船などにおける各種鋼構造物の溶接に用いる炭酸ガスシールドアーク溶接用メタル系フラックス入りワイヤに関し、アークが安定してスパッタ発生量が少なくスラグ剥離性が良好であるなど、溶接作業性に優れるとともに溶接金属の機械的性能の良好な炭酸ガスシールドアーク溶接用メタル系フラックス入りワイヤに関する。 The present invention relates to a metal-based flux-containing wire for carbon dioxide gas shielded arc welding used for welding various steel structures in construction, bridges, shipbuilding, etc., in which the arc is stable, the amount of spatter generated is small, and the slag peeling property is good. The present invention relates to a metal-based flux-containing wire for carbon dioxide gas shielded arc welding, which is excellent in welding workability and mechanical performance of welded metal.
ガスシールドアーク溶接用ワイヤにはソリッドワイヤとフラックス入りワイヤがあり、用途に応じて使い分けがされている。ソリッドワイヤは使用目的に応じて成分調整がなされた各種のワイヤが開発され、ＪＩＳ Ｚ３３１２等に規格化されて一般的に使用されている。また、フラックス入りワイヤはスラグ系と総称されるスラグ成分を主としたフラックスを充填したワイヤと、メタル系と総称される金属成分を主としたフラックスを充填したワイヤが多数開発されており、ＪＩＳ Ｚ３３１３等に規格化されている。 There are two types of gas shielded arc welding wire, solid wire and flux-cored wire, which are used according to the application. As for the solid wire, various wires whose components have been adjusted according to the purpose of use have been developed, standardized to JIS Z3312 and the like, and generally used. In addition, a large number of flux-cored wires have been developed, one is a wire filled with a flux mainly containing a slag component, which is generally called a slag type, and the other is a wire filled with a flux mainly containing a metal component, which is generally called a metal type. It is standardized to Z3313 and the like.
建築鉄骨分野においては、溶接施工の能率向上を図るため、ソリッドワイヤを用いた高電流域でのガスシールドアーク溶接が行われている。ソリッドワイヤでの高電流溶接では、１層毎の溶着量が多いので溶接の高能率化が可能であるが、アークが不安定でスパッタ発生量が多く、ビード形状やビード外観が不良であるなど溶接作業性が悪いという問題点がある。また、スパッタが大粒になるため、鋼板表面に付着したスパッタを除去する作業も困難となり作業効率も不良であった。 In the field of building steel frames, gas shielded arc welding is performed in a high current range using solid wires in order to improve the efficiency of welding work. In high-current welding with solid wire, it is possible to improve the efficiency of welding because the amount of welding for each layer is large, but the arc is unstable and the amount of spatter generated is large, and the bead shape and bead appearance are poor. There is a problem that welding workability is poor. In addition, since the spatter becomes large, it is difficult to remove the spatter adhering to the surface of the steel sheet, and the work efficiency is also poor.
一方、フラックス入りワイヤ中のメタル系フラックス入りワイヤは、充填するフラックスにアーク安定剤を添加できるため、ソリッドワイヤと比較して、大粒のスパッタ発生量が少なく、ビード形状が良好になるといった特長がある。また、ＭｎやＳｉなどの合金剤や脱酸剤の調整によりスラグ生成量を少なくすることができ、さらに、溶接金属の低酸素化によって溶接金属の靱性向上にも有効であるので広く適用されている。 On the other hand, the metal-based flux-cored wire in the flux-cored wire has the advantages that the amount of spatter generated in large particles is smaller and the bead shape is better than that of the solid wire because the arc stabilizer can be added to the flux to be filled. is there. Further, the amount of slag generated can be reduced by adjusting an alloying agent such as Mn or Si or an antacid, and further, it is effective in improving the toughness of the weld metal by reducing the oxygen content of the weld metal, so that it is widely applied. There is.
高電流域で使用されるメタル系フラックス入りワイヤは、これまで種々の開発が進められている。例えば、特許文献１には、ヒューム発生量及びスパッタ発生量の少ないガスシールドアーク溶接用メタル系フラックス入りワイヤが開示されている。しかし、特許文献１に記載のメタル系フラックス入りワイヤは、溶接作業性は良好であるが、溶接金属の機械的性能が不十分であった。 Various developments have been made so far on the metal flux-cored wire used in the high current range. For example, Patent Document 1 discloses a metal-based flux-containing wire for gas shielded arc welding in which the amount of fume generated and the amount of spatter generated are small. However, although the metal-based flux-cored wire described in Patent Document 1 has good welding workability, the mechanical performance of the weld metal is insufficient.
また、特許文献２には、小パス大入熱の片面溶接において、溶接作業性及び機械的性質が良好なメタル系フラックス入りワイヤが開示されている。しかし、特許文献２に記載のメタル系フラックス入りワイヤは、酸化物の含有量が少なすぎるので良好な溶接作業性を確保することができないという問題点がある。 Further, Patent Document 2 discloses a metal-based flux-cored wire having good welding workability and mechanical properties in single-sided welding with a small pass and a large heat input. However, the metal-based flux-cored wire described in Patent Document 2 has a problem that good welding workability cannot be ensured because the oxide content is too small.
さらに、特許文献３には、フラックスを低充填率とすることにより、ソリッドワイヤの高溶着性とフラックス入りワイヤのアーク安定性を両立させたメタル系フラックス入りワイヤが開示されている。しかし、特許文献３に記載のメタル系フラックス入りワイヤは、フラックスの充填率が低いので、フラックス入りワイヤの生産性が劣化するという問題点がある。また、特許文献３においてもフラックス中の酸化物が少なすぎるので、良好な溶接作業性を得ることができないという問題点があった。 Further, Patent Document 3 discloses a metal-based flux-cored wire that achieves both high welding property of a solid wire and arc stability of a flux-cored wire by setting the flux to a low filling rate. However, the metal-based flux-cored wire described in Patent Document 3 has a problem that the productivity of the flux-filled wire deteriorates because the flux filling rate is low. Further, also in Patent Document 3, there is a problem that good welding workability cannot be obtained because the amount of oxide in the flux is too small.
そこで本発明は、上述した問題点に鑑みて案出されたものであり、鋼構造物などの炭酸ガスシールドアーク溶接にあたり、高電流の溶接条件においてアークが安定してスパッタ発生量が少なく、スラグ剥離性、ビード形状やビード外観が良好で、耐割れ性にも優れ、さらに、溶接金属の強度及び靭性が良好な炭酸ガスシールドアーク溶接用メタル系フラックス入りワイヤを提供することを目的とする。 Therefore, the present invention has been devised in view of the above-mentioned problems. In carbon dioxide shielded arc welding of steel structures and the like, the arc is stable under high current welding conditions, the amount of spatter generated is small, and slag is generated. It is an object of the present invention to provide a metal flux-cored wire for carbon dioxide gas shielded arc welding, which has good peelability, bead shape and bead appearance, excellent crack resistance, and good strength and toughness of weld metal.
本発明者らは、上述した問題点を解決する目的から、高電流での炭酸ガスシールドアーク溶接において、強度及び靭性を確保でき、耐割れ性に優れ、かつ、アークが安定してスパッタ発生量が少なく、スラグ剥離性及びビード形状やビード外観が良好などの溶接作業性に優れた炭酸ガスシールドアーク溶接用メタル系フラックス入りワイヤの組成成分を得るべく、様々な検討を行った。 For the purpose of solving the above-mentioned problems, the present inventors can secure strength and toughness in carbon dioxide gas shielded arc welding at a high current, have excellent crack resistance, and the arc is stably generated. Various studies were conducted in order to obtain a composition component of a metal-based flux-cored wire for carbon dioxide gas shielded arc welding, which has excellent welding workability such as slag peelability, bead shape, and bead appearance.
その結果、フラックス中に含有させることで溶接作業性を向上させる反面、靭性を劣化させる原因でもあったＳｉ酸化物の含有量を適正にすることで、アークを安定にし、スパッタ発生量を低減するのみでなく、靭性をも向上させるのに有効であることを見出した。 As a result, while improving welding workability by containing it in the flux, by optimizing the content of Si oxide, which was also a cause of deterioration of toughness, the arc is stabilized and the amount of spatter generated is reduced. It was found that it is effective not only for improving toughness but also for improving toughness.
また、ワイヤ中のＣ、Ｓｉ、Ｍｎ、Ｔｉ及びＣｕの含有量を適正にすることで、溶接金属の強度確保と靭性の向上を同時に達成し、かつ、Ｍｇ、Ａｌ酸化物、Ｎａ化合物及びＫ化合物の含有量を適正にすることで、溶接作業性をより向上できることを見出した。 Further, by optimizing the contents of C, Si, Mn, Ti and Cu in the wire, the strength of the weld metal and the improvement of toughness are simultaneously achieved, and Mg, Al oxide, Na compound and K are achieved. We have found that welding workability can be further improved by optimizing the content of the compound.
さらに、Ｎｉ及びＭｏの含有量を適正にすることで、溶接金属の更なる靭性の改善及び高強度化が可能であることを見出した。 Furthermore, it has been found that by adjusting the contents of Ni and Mo appropriately, it is possible to further improve the toughness and increase the strength of the weld metal.
すなわち、本発明に係る炭酸ガスシールドアーク溶接用メタル系フラックス入りワイヤの要旨は、鋼製外皮にフラックスを充填してなる炭酸ガスシールドアーク溶接用メタル系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、鋼製外皮とフラックスの合計で、Ｃ：０．０５〜０．１０％、Ｓｉ：０．７〜２．０％、Ｍｎ：１．３〜３．０％、Ｔｉ：０．０１〜０．３％、Ｃｕ：０．０５〜０．４５％を含有し、Ａｌ：０．１０％以下であり、さらに、ワイヤ全質量に対する質量％で、フラックス中にＳｉ酸化物のＳｉＯ2換算値の合計：０．２１〜０．６０％、Ａｌ酸化物のＡｌ2Ｏ3換算値の合計：０．１０〜０．３５％、Ｍｇ：０．０５〜０．２０％、Ｎａ化合物及びＫ化合物のＮａ2Ｏ換算値とＫ2Ｏ換算値の合計：０．０３〜０．２５％を含有し、残部が鋼製外皮のＦｅ、鉄粉、鉄合金粉のＦｅ分及び不可避不純物からなることを特徴とする。 That is, the gist of the metal-based flux-containing wire for carbon dioxide-shielded arc welding according to the present invention is the mass% of the total weight of the wire in the carbon-based flux-containing wire for carbon dioxide-shielded arc welding in which the steel outer skin is filled with flux. The total of steel outer skin and flux is C: 0.05 to 0.10%, Si: 0.7 to 2.0%, Mn: 1.3 to 3.0%, Ti: 0.01 to It contains 0.3%, Cu: 0.05 to 0.45%, Al: 0.10% or less, and further, in mass% with respect to the total weight of the wire, the SiO 2 equivalent value of the Si oxide in the flux. Total: 0.21 to 0.60%, Total of Al 2 O 3 conversion values of Al oxide: 0.10 to 0.35%, Mg: 0.05 to 0.20%, Na compound and K compound Total of Na 2 O conversion value and K 2 O conversion value: 0.03 to 0.25%, and the balance is composed of Fe of steel outer skin, Fe content of iron powder, Fe content of iron alloy powder and unavoidable impurities. It is characterized by.
また本発明に係る炭酸ガスシールドアーク溶接用メタル系フラックス入りワイヤの要旨は、更にワイヤ全質量に対する質量％で、鋼製外皮とフラックスの合計で、Ｎｉ及びＭｏの１種または２種の合計：０．１〜２．０％を更に含有することも特徴とする。 Further, the gist of the metal flux-cored wire for carbon dioxide gas shielded arc welding according to the present invention is further, the mass% with respect to the total mass of the wire, the total of the steel outer skin and the flux, and the total of one or two types of Ni and Mo: It is also characterized by further containing 0.1 to 2.0%.
本発明を適用した炭酸ガスシールドアーク溶接用メタル系フラックス入りワイヤによれば、高電流の溶接条件においてアークが安定性してスパッタ発生量が少なく、スラグ剥離性、ビード形状やビード外観が良好で、耐割れ性にも優れ、さらに強度及び靭性が良好な溶接金属が得られるなど、溶接能率及び溶接部の品質向上を図ることが可能となる。 According to the metal flux-containing wire for carbon dioxide gas shielded arc welding to which the present invention is applied, the arc is stable under high current welding conditions, the amount of spatter generated is small, and the slag peelability, bead shape and bead appearance are good. It is possible to improve the welding efficiency and the quality of the welded portion, such as obtaining a weld metal having excellent crack resistance and good strength and toughness.
以下、本発明を適用した炭酸ガスシールドアーク溶接用メタル系フラックス入りワイヤの成分組成と、その成分組成の限定理由について説明する。なお、各成分組成の含有量は、フラックス入りワイヤ全質量に対する質量％で表すこととし、その質量％を表すときには単に％と記載して表すこととする。 Hereinafter, the component composition of the metal flux-cored wire for carbon dioxide gas shielded arc welding to which the present invention is applied and the reason for limiting the component composition will be described. The content of each component composition shall be expressed in mass% with respect to the total mass of the flux-cored wire, and when the mass% is expressed, it shall be expressed simply as%.
［鋼製外皮とフラックスの合計でＣ：０．０５〜０．１０％］
Ｃは、溶接金属の強度向上の効果がある。しかし、Ｃが０．０５％未満では、この効果が得られず、十分な溶接金属の強度が得られない。一方、Ｃが０．１０％を超えると、Ｃが溶接金属中に過剰に歩留まることにより、溶接金属の強度が過剰に高くなって靱性が低下する。またＣが０．１０％を超えると、アークが不安定になり、スパッタ発生量が多くなる。従って、鋼製外皮とフラックスの合計でＣは０．０５〜０．１０％とする。なお、Ｃは、鋼製外皮に含まれる成分の他、フラックスから金属粉及び合金粉などから添加できる。
[Total of steel outer skin and flux C: 0.05 to 0.10%]
C has the effect of improving the strength of the weld metal. However, if C is less than 0.05%, this effect cannot be obtained and sufficient strength of the weld metal cannot be obtained. On the other hand, when C exceeds 0.10%, C is excessively retained in the weld metal, so that the strength of the weld metal becomes excessively high and the toughness decreases. If C exceeds 0.10%, the arc becomes unstable and the amount of spatter generated increases. Therefore, the total of the steel outer skin and the flux is set to 0.05 to 0.10%. In addition to the components contained in the steel outer skin, C can be added from flux, metal powder, alloy powder, or the like.
［鋼製外皮とフラックスの合計でＳｉ：０．７〜２．０％］
Ｓｉは、溶接金属の強度及び靭性を向上させる効果があるとともに溶融金属の粘性を大きくしてビード形状を整える効果がある。しかし、Ｓｉが０．７％未満では、溶接金属の強度及び靭性が低下する。またＳｉが０．７％未満では、溶融金属の粘性が不足してビード形状が凸状になる。一方、Ｓｉが２．０％を超えると、溶接金属の強度が過剰に高くなって靭性が低下する。従って、鋼製外皮とフラックスの合計でＳｉは０．７〜２．０％とする。なお、Ｓｉは、鋼製外皮に含まれる成分の他、フラックスから金属Ｓｉ、Ｆｅ−Ｓｉ、Ｆｅ−Ｓｉ−Ｍｎなどの合金粉から添加できる。
[Total of steel outer skin and flux Si: 0.7-2.0%]
Si has the effect of improving the strength and toughness of the weld metal and also has the effect of increasing the viscosity of the molten metal and adjusting the bead shape. However, if Si is less than 0.7%, the strength and toughness of the weld metal are reduced. If Si is less than 0.7%, the viscosity of the molten metal is insufficient and the bead shape becomes convex. On the other hand, when Si exceeds 2.0%, the strength of the weld metal becomes excessively high and the toughness decreases. Therefore, the total of the steel outer skin and the flux is set to 0.7 to 2.0%. In addition to the components contained in the steel outer skin, Si can be added from alloy powders such as metal Si, Fe-Si, and Fe-Si-Mn from flux.
［鋼製外皮とフラックスの合計でＭｎ：１．３〜３．０％］
Ｍｎは、溶接金属に歩留まることにより、溶接金属の強度と靱性を高める効果がある。また、溶接金属中にＭｎＳを生成して溶接金属の耐高温割れ性を高める効果がある。しかし、Ｍｎが１．３％未満では、これらの効果が得られず、十分な溶接金属の強度及び靭性が得られない。またＭｎが１．３％未満では、耐高温割れ性も低下する。一方、Ｍｎが３．０％を超えると、Ｍｎが溶接金属中に過剰に歩留まり、溶接金属の強度が過剰に高くなって靱性が低下する。従って、鋼製外皮とフラックスの合計でＭｎは、１．３〜３．０％とする。なおＭｎは、鋼製外皮に含まれる成分の他、フラックスから金属Ｍｎ、Ｆｅ−Ｍｎ、Ｆｅ−Ｓｉ−Ｍｎなどの合金粉から添加できる。
[Mn: 1.3 to 3.0% in total of steel outer skin and flux]
Mn has the effect of increasing the strength and toughness of the weld metal by retaining the weld metal. Further, there is an effect of generating MnS in the weld metal to enhance the high temperature crack resistance of the weld metal. However, if Mn is less than 1.3%, these effects cannot be obtained, and sufficient strength and toughness of the weld metal cannot be obtained. Further, when Mn is less than 1.3%, the high temperature crack resistance is also lowered. On the other hand, when Mn exceeds 3.0%, Mn is excessively yielded in the weld metal, the strength of the weld metal becomes excessively high, and the toughness is lowered. Therefore, the total Mn of the steel outer skin and the flux is 1.3 to 3.0%. In addition to the components contained in the steel outer skin, Mn can be added from alloy powders such as metal Mn, Fe-Mn, and Fe-Si-Mn from flux.
［鋼製外皮とフラックスの合計でＴｉ：０．０１〜０．３％］
Ｔｉは、脱酸剤として作用するとともに溶接金属中にＴｉの微細酸化物を生成し溶接金属の靭性を向上させる。Ｔｉが０．０１％未満であると、溶接金属の靭性が安定して得られない。一方、Ｔｉが０．３％を超えると、溶接金属中の固溶Ｔｉが過剰になることで、強度が過剰に高くなって靭性が低下する。従って、鋼製外皮とフラックスの合計でＴｉは０．０１〜０．３％とする。なお、Ｔｉは、鋼製外皮に含まれる成分の他、フラックスからの金属Ｔｉ、Ｆｅ−Ｔｉなどの合金粉から添加できる。
[Total of steel outer skin and flux Ti: 0.01-0.3%]
Ti acts as a deoxidizer and forms fine oxides of Ti in the weld metal to improve the toughness of the weld metal. If Ti is less than 0.01%, the toughness of the weld metal cannot be stably obtained. On the other hand, when Ti exceeds 0.3%, the solid solution Ti in the weld metal becomes excessive, so that the strength becomes excessively high and the toughness decreases. Therefore, the total of the steel outer skin and the flux is set to 0.01 to 0.3%. In addition to the components contained in the steel outer skin, Ti can be added from alloy powders such as metal Ti and Fe-Ti from flux.
［鋼製外皮とフラックスの合計でＣｕ：０．０５〜０．４５％］
Ｃｕは、析出強化作用を有し、変態温度を低下させ溶接金属の組織を微細化して靭性を安定させる。しかし、Ｃｕが０．０５％未満であると、その効果が得られず、安定した溶接金属の靭性が得られない。一方、Ｃｕが０．４５％を超えると、析出脆化が生じて溶接金属の靭性が低下し、また高温割れが発生しやすくなる。従って、鋼製外皮とフラックスの合計でＣｕは０．０５〜０．４５％とする。なお、Ｃｕは、鋼製外皮に含まれる成分及び鋼製外皮表面に施したＣｕめっき分の他、フラックスからの金属Ｃｕ、Ｆｅ−Ｓｉ−Ｃｕなどの合金粉から添加できる。
[Cu: 0.05 to 0.45% in total of steel outer skin and flux]
Cu has a precipitation strengthening effect, lowers the transformation temperature, refines the structure of the weld metal, and stabilizes toughness. However, if Cu is less than 0.05%, the effect cannot be obtained and stable toughness of the weld metal cannot be obtained. On the other hand, if Cu exceeds 0.45%, precipitation embrittlement occurs, the toughness of the weld metal is lowered, and high temperature cracking is likely to occur. Therefore, the total of the steel outer skin and the flux is set to 0.05 to 0.45%. Cu can be added from the components contained in the steel outer skin and the Cu plating component applied to the surface of the steel outer skin, as well as from alloy powders such as metal Cu and Fe—Si—Cu from flux.
［鋼製外皮とフラックスの合計でＡｌ：０．１０％以下］
Ａｌは、酸化物として溶接金属に残留して溶接金属の靭性を低下させる。特にこのＡｌが０．１０％を超えると、溶接金属の靭性が低下してしまう。従って、Ａｌは０．１０％以下とする。なお、Ａｌは、必須の元素ではなく、含有率が０％とされていてもよい。
[Total of steel outer skin and flux Al: 0.10% or less]
Al remains as an oxide in the weld metal and reduces the toughness of the weld metal. In particular, if this Al exceeds 0.10%, the toughness of the weld metal will decrease. Therefore, Al is 0.10% or less. Al is not an essential element, and the content may be 0%.
［フラックス中のＳｉ酸化物のＳｉＯ2換算値の合計：０．２１〜０．６０％］
Ｓｉ酸化物は、ビード止端部のなじみを良好にしてビード形状やビード外観を良好にするだけでなく、溶接金属に残留した酸化物が核生成を促して微細な組織を形成することで靭性を向上させる効果がある。しかし、Ｓｉ酸化物のＳｉＯ2換算値の合計が０．２１％未満であると、ビード止端部のなじみが不良になり、ビード形状や外観が不良となり、スラグ剥離性も不良となる。さらにＳｉ酸化物のＳｉＯ2換算値の合計が０．２１％未満であると、溶接金属の靭性が低下する。一方、Ｓｉ酸化物のＳｉＯ2換算値の合計が０．６０％を超えると、溶接金属中の酸素量が増加して靭性が低下する。従って、フラックス中のＳｉ酸化物のＳｉＯ2換算値の合計は０．２１〜０．６０％とする。なお、Ｓｉ酸化物は、フラックスからの珪砂、珪酸ソーダ及び珪酸カリからなる水ガラスの固質成分などから添加できる。
[Total SiO 2 conversion value of Si oxide in flux: 0.21 to 0.60%]
Si oxide not only improves the familiarity of the bead toe and improves the bead shape and bead appearance, but also the oxide remaining in the weld metal promotes nucleation to form a fine structure, thereby forming toughness. Has the effect of improving. However, if the total SiO 2 conversion value of the Si oxide is less than 0.21%, the bead toe end is poorly fitted, the bead shape and appearance are poor, and the slag peelability is also poor. Further, if the total SiO 2 conversion value of the Si oxide is less than 0.21%, the toughness of the weld metal is lowered. On the other hand, when the total SiO 2 conversion value of the Si oxide exceeds 0.60%, the amount of oxygen in the weld metal increases and the toughness decreases. Therefore, the total value of Si oxides in the flux in terms of SiO 2 is 0.21 to 0.60%. The Si oxide can be added from a solid component of water glass composed of silica sand from flux, sodium silicate, and potassium silicate.
［フラックス中のＡｌ酸化物のＡｌ2Ｏ3換算値の合計：０．１０〜０．３５％）］
Ａｌ酸化物は、アークを安定させるとともに、スパッタ発生量を少なくする効果がある。しかし、Ａｌ酸化物のＡｌ2Ｏ3換算値の合計が０．１０％未満であると、アークが不安定となりスパッタ発生量が多くなり、ビード形状や外観も不良となる。一方、Ａｌ酸化物のＡｌ2Ｏ3換算値の合計が０．３５％を超えると、アークが不安定となりビード形状や外観が不良となる。またＡｌ酸化物のＡｌ2Ｏ3換算値の合計が０．３５％を超えると、溶接金属中にＡｌ2Ｏ3が過剰に歩留り、靭性が低下する。従って、フラックス中のＡｌ酸化物のＡｌ2Ｏ3換算値の合計は０．１０〜０．３５％とする。なお、Ａｌ酸化物は、フラックスからのアルミナ、カリ長石などから添加できる。
[Total Al 2 O 3 conversion value of Al oxide in flux: 0.10 to 0.35%]]
Al oxide has the effect of stabilizing the arc and reducing the amount of spatter generated. However, if the total Al 2 O 3 conversion value of the Al oxide is less than 0.10%, the arc becomes unstable, the amount of spatter generated increases, and the bead shape and appearance become poor. On the other hand, if the total Al 2 O 3 conversion value of Al oxide exceeds 0.35%, the arc becomes unstable and the bead shape and appearance become poor. Further, when the total Al 2 O 3 conversion value of the Al oxide exceeds 0.35%, Al 2 O 3 is excessively retained in the weld metal, and the toughness is lowered. Therefore, the total Al 2 O 3 conversion value of Al oxide in the flux is 0.10 to 0.35%. Al oxide can be added from alumina from flux, potassium feldspar, and the like.
［フラックス中のＭｇ：０．０５〜０．２０％］
Ｍｇは、アークの集中性を高めてビード形状やビード外観を良好にし、スパッタ発生量を少なくする効果がある。しかし、Ｍｇが０．０５％未満であると、アークが集中せずに不安定となり、ビード形状やビード外観が悪くなる。一方、Ｍｇが０．２０％を超えると、溶融池に溶接スラグが過剰に生成することでアークが不安定になり、スパッタ発生量が多くなる。従って、フラックス中のＭｇは０．０５〜０．２０％とする。なお、Ｍｇは、フラックスからの金属Ｍｇ、Ａｌ−Ｍｇなどの合金粉末から添加できる。
[Mg in flux: 0.05 to 0.20%]
Mg has the effect of increasing the concentration of arcs, improving the bead shape and bead appearance, and reducing the amount of spatter generated. However, if Mg is less than 0.05%, the arcs are not concentrated and become unstable, resulting in poor bead shape and bead appearance. On the other hand, when Mg exceeds 0.20%, welding slag is excessively generated in the molten pool, so that the arc becomes unstable and the amount of spatter generated increases. Therefore, Mg in the flux is set to 0.05 to 0.20%. In addition, Mg can be added from alloy powders such as metal Mg and Al-Mg from flux.
［フラックス中のＮａ化合物及びＫ化合物のＮａ2Ｏ換算値とＫ2Ｏ換算値の合計：０．０３〜０．２５％］
Ｎａ化合物及びＫ化合物は、アークをソフトにして安定にする効果がある。しかし、Ｎａ化合物及びＫ化合物のＮａ2Ｏ換算値とＫ2Ｏ換算値の合計が０．０３％未満であると、アークが不安定になりスパッタ発生量が多くなる。一方、Ｎａ化合物及びＫ化合物のＮａ2Ｏ換算値とＫ2Ｏ換算値の合計が０．２５％を超えると、アークが強くなりスパッタ発生量が多くなる。また、ビード止端部のなじみが悪くなりビード形状やビード外観が不良となる。従って、フラックス中のＮａ化合物及びＫ化合物のＮａ2Ｏ換算値とＫ2Ｏ換算値の合計は０．０３〜０．２５％とする。なお、Ｎａ化合物及びＫ化合物は、フラックスからの珪酸ソーダ及び珪酸カリからなる水ガラスの固質成分、カリ長石、弗化ソーダ、珪弗化カリウムなどの粉末から添加できる。
[Total of Na 2 O conversion value and K 2 O conversion value of Na compound and K compound in flux: 0.03 to 0.25%]
The Na compound and the K compound have the effect of softening and stabilizing the arc. However, if the total of the Na 2 O conversion value and the K 2 O conversion value of the Na compound and the K compound is less than 0.03%, the arc becomes unstable and the amount of spatter generated increases. On the other hand, when the total of the Na 2 O conversion value and the K 2 O conversion value of the Na compound and the K compound exceeds 0.25%, the arc becomes strong and the amount of spatter generated increases. In addition, the fit of the bead toe end becomes poor, and the bead shape and the bead appearance become poor. Therefore, the total of the Na 2 O conversion value and the K 2 O conversion value of the Na compound and the K compound in the flux is 0.03 to 0.25%. The Na compound and the K compound can be added from a solid component of water glass composed of sodium silicate and potassium silicate from flux, and powders such as potassium orthoclase, sodium fluoride, and potassium silicate.
［鋼製外皮とフラックスの合計でＮｉ及びＭｏの１種または２種の合計：０．１〜２．０％］
Ｎｉ及びＭｏは、溶接金属の靭性を良好にするとともに、溶接金属の焼入れ性を向上させて強度を上昇させる。しかし、Ｎｉ及びＭｏの1種または２種の合計が０．１％未満では、その効果が十分に得られず、溶接金属の強度及び靭性を向上させる効果が得られない。一方、Ｎｉ及びＭｏの１種または２種が２．０％を超えると、溶接金属の強度が過度に上昇して靭性が低下する。従って、フラックス中のＮｉ及びＭｏの１種または２種の合計は０．１〜２．０％とする。なお、Ｎｉは、鋼製外皮に含まれる成分の他、フラックスからの金属Ｎｉ、Ｆｅ−Ｎｉなどの金属粉末から添加できる。また、Ｍｏは、鋼製外皮に含まれる成分の他、フラックスからの金属Ｍｏ、Ｆｅ−Ｍｏなどの合金粉から添加される。
[Total of steel outer skin and flux: Total of 1 or 2 types of Ni and Mo: 0.1 to 2.0%]
Ni and Mo improve the toughness of the weld metal and improve the hardenability of the weld metal to increase the strength. However, if the total of one or two of Ni and Mo is less than 0.1%, the effect cannot be sufficiently obtained, and the effect of improving the strength and toughness of the weld metal cannot be obtained. On the other hand, when one or two of Ni and Mo exceeds 2.0%, the strength of the weld metal is excessively increased and the toughness is lowered. Therefore, the total of one or two types of Ni and Mo in the flux is 0.1 to 2.0%. In addition to the components contained in the steel outer skin, Ni can be added from metal powders such as metal Ni and Fe-Ni from flux. In addition to the components contained in the steel outer skin, Mo is added from alloy powders such as metal Mo and Fe-Mo from flux.
本発明の炭酸ガスシールドアーク溶接用メタル系フラックス入りワイヤの残部は、鋼製外皮のＦｅ、成分調整のために添加する鉄粉、Ｆｅ−Ｍｎ、Ｆｅ−Ｓｉ合金等の鉄合金粉のＦｅ分及び不可避不純物である。 The rest of the metal-based flux-containing wire for carbon dioxide gas shield arc welding of the present invention is the Fe content of the steel outer skin Fe, iron powder added for component adjustment, and iron alloy powder such as Fe-Mn and Fe-Si alloy. And unavoidable impurities.
また、本発明の炭酸ガスシールドアーク溶接用メタル系フラックス入りワイヤは、鋼製外皮をパイプ状に成形し、その内部にフラックスを充填した構造である。ワイヤの種類としては、成形した鋼製外皮の合わせ目を溶接して得られる鋼製外皮に継目の無いワイヤと、鋼製外皮の合わせ目の溶接を行わないままとした鋼製外皮に継目を有するワイヤとに大別できる。鋼製外皮に継目が無いワイヤは、ワイヤ中の全水素量を低減することを目的とした熱処理が可能であり、また製造後のフラックスの吸湿が無いため、溶接金属の拡散性水素量を低減し、耐低温割れ性の向上を図ることができるので好ましい。 Further, the metal-based flux-cored wire for carbon dioxide shield arc welding of the present invention has a structure in which a steel outer skin is formed into a pipe shape and the inside thereof is filled with flux. As for the types of wires, seamless wires are used for the steel outer skin obtained by welding the seams of the molded steel outer skin, and seams are used for the steel outer skin without welding the seams of the steel outer skin. It can be roughly divided into the wires it has. A wire with a seamless steel outer skin can be heat-treated for the purpose of reducing the total amount of hydrogen in the wire, and since there is no moisture absorption of flux after production, the amount of diffusible hydrogen in the weld metal is reduced. However, it is preferable because it can improve the low temperature cracking resistance.
フラックス充填率は特に規定しないが、生産性の観点から、ワイヤ全質量に対して８〜２０％とすることが好ましい。 The flux filling rate is not particularly specified, but from the viewpoint of productivity, it is preferably 8 to 20% with respect to the total mass of the wire.
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。 Hereinafter, the effects of the present invention will be described in more detail with reference to Examples.
まず、鋼製外皮にＪＩＳ Ｇ３１４１ ＳＰＣＣ帯鋼を使用し、該鋼製外皮をＵ字型にして成形した後、鋼製外皮の合わせ目を溶接した継目が無いワイヤを造管、伸線して表１に示すワイヤ径１．６ｍｍの各種成分のメタル系フラックス入りワイヤを試作した。なお、フラックス充填率は１０〜１８％とした。 First, JIS G3141 SPCC strip steel is used for the steel outer skin, and the steel outer skin is formed into a U shape, and then a seamless wire with welded seams of the steel outer skin is formed and drawn. We made prototype wires containing metal flux of various components with a wire diameter of 1.6 mm shown in Table 1. The flux filling rate was 10 to 18%.
これら試作ワイヤで、ＪＩＳ Ｇ ３１０６ ＳＭ４９０Ｂに規定される鋼板を用い、溶接作業性の調査及び溶着金属試験を実施した。 Welding workability was investigated and welded metal tests were carried out using the steel plates specified in JIS G 3106 SM490B for these prototype wires.
溶接作業性の評価は、表２に示す溶接条件で下向すみ肉溶接を行い、アークの安定性、スパッタ発生量、スラグ剥離性及びビード形状やビード外観について調査した。 To evaluate the welding workability, downward fillet welding was performed under the welding conditions shown in Table 2, and the arc stability, spatter generation amount, slag peelability, bead shape, and bead appearance were investigated.
溶着金属試験は、ＪＩＳ Ｚ ３１１１に準じて溶接し、表２に示す溶接条件で溶接を実施し、溶着金属の板厚方向の中心部から引張試験（Ａ０号）及び衝撃試験（Ｖノッチ試験片）を採取して、機械試験を実施した。引張試験の評価は、引張強さが５００〜６４０ＭＰａを良好とした。靭性の評価は、０℃でシャルピー衝撃試験を行い、各々繰返し３本の吸収エネルギーの平均が７０Ｊ以上を良好とした。この際、初層溶接時に高温割れの有無を目視確認で調査した。これらの結果を表３にまとめて示す。 In the weld metal test, welding is performed according to JIS Z 3111, welding is performed under the welding conditions shown in Table 2, and a tensile test (A0) and an impact test (V notch test piece) are performed from the center of the weld metal in the plate thickness direction. ) Was collected and a mechanical test was carried out. In the evaluation of the tensile test, the tensile strength was good at 500 to 640 MPa. For the evaluation of toughness, a Charpy impact test was carried out at 0 ° C., and the average absorbed energy of each of the three repeated lines was 70 J or more. At this time, the presence or absence of high temperature cracks during the first layer welding was visually confirmed. These results are summarized in Table 3.
表１及び表３中ワイヤ記号Ａ１〜Ａ１１が本発明例、ワイヤ記号Ｂ１〜Ｂ１５は比較例である。本発明例であるワイヤ記号．Ａ１〜Ａ１１は、Ｃ、Ｓｉ、Ｍｎ、Ｔｉ、Ｃｕ、Ａｌの各含有量、ＳｉＯ2換算値の合計、Ａｌ2Ｏ3換算値の合計、Ｍｇ及びＮａ2Ｏ換算値とＫ2Ｏ換算値の合計が適正であるので、アークが安定してスパッタ発生量が少なく、スラグ剥離性及びビード形状やビード外観が良好であるなど溶接作業性が良好であるとともに、高温割れが発生せず、溶着金属の引張強さ及び吸収エネルギーも良好であった。また、ワイヤ記号Ａ３、Ａ４及びＡ７〜Ａ９は、Ｎｉ及びＭｏの１種または２種の合計を適量含んでいるので、溶着金属の引張強さ及び吸収エネルギーの向上効果が得られるなど極めて満足な結果であった。 In Tables 1 and 3, wire symbols A1 to A11 are examples of the present invention, and wire symbols B1 to B15 are comparative examples. The wire symbol which is an example of the present invention. A1 to A11 are C, Si, Mn, Ti, Cu, and Al contents, total SiO 2 conversion value, total Al 2 O 3 conversion value, Mg and Na 2 O conversion value, and K 2 O conversion value. Since the total of is appropriate, the arc is stable and the amount of spatter generated is small, the welding workability is good such as slag peelability, bead shape and bead appearance, and high temperature cracking does not occur and welding is performed. The tensile strength and absorbed energy of the metal were also good. Further, since the wire symbols A3, A4 and A7 to A9 contain an appropriate amount of one or two types of Ni and Mo, the effect of improving the tensile strength and absorption energy of the weld metal can be obtained, which is extremely satisfactory. It was a result.
比較例中ワイヤ記号Ｂ１は、Ｃが多いので、アークが不安定でスパッタ発生量が多かった。また、溶着金属の引張強さが高く、吸収エネルギーが低値であった。 In the comparative example, the wire symbol B1 has a large amount of C, so that the arc is unstable and the amount of spatter generated is large. In addition, the tensile strength of the weld metal was high and the absorbed energy was low.
ワイヤ記号Ｂ２は、Ｃが少ないので、溶着金属の引張強さが低値であった。また、Ａｌ2Ｏ3換算値の合計が多いので、アークが不安定でスパッタ発生量が多く、溶着金属の吸収エネルギーが低値であった。 Since the wire symbol B2 has a small amount of C, the tensile strength of the weld metal was low. In addition, since the total of Al 2 O 3 conversion values was large, the arc was unstable, the amount of spatter generated was large, and the absorbed energy of the weld metal was low.
ワイヤ記号Ｂ３は、Ｓｉが多いので、溶着金属の引張強さが高く、吸収エネルギーが低値であった。また、Ｎａ2Ｏ換算値とＫ2Ｏ換算値の合計が多いので、アークが不安定でスパッタ発生量が多く、ビード形状やビード外観が不良であった。 Since the wire symbol B3 contains a large amount of Si, the tensile strength of the weld metal is high and the absorbed energy is low. Further, since the sum of the Na 2 O conversion value and the K 2 O conversion value is large, the arc is unstable, the amount of spatter generated is large, and the bead shape and the bead appearance are poor.
ワイヤ記号Ｂ４は、Ｓｉが少ないので、ビード形状やビード外観が不良で、溶着金属の引張強さが低く、吸収エネルギーが低値であった。また、Ｎｉ及びＭｏの１種または２種が少ないので、溶着金属の引張強さ及び吸収エネルギーの向上効果は得られなかった。 Since the wire symbol B4 has a small amount of Si, the bead shape and the bead appearance are poor, the tensile strength of the weld metal is low, and the absorbed energy is low. Further, since one or two types of Ni and Mo are small, the effect of improving the tensile strength and absorption energy of the weld metal could not be obtained.
ワイヤ記号Ｂ５は、Ｎａ2Ｏ換算値とＫ2Ｏ換算値の合計が少ないので、アークが不安定でスパッタ発生量が多かった。また、Ｎｉ及びＭｏの１種または２種の合計が多いので、溶着金属の引張強さが高く、吸収エネルギーが低値であった。 Since the sum of the Na 2 O conversion value and the K 2 O conversion value of the wire symbol B5 is small, the arc is unstable and the amount of spatter generated is large. Further, since the total of one or two types of Ni and Mo was large, the tensile strength of the weld metal was high and the absorbed energy was low.
ワイヤ記号Ｂ６は、Ｍｎが少ないので、クレータ割れが生じ、溶着金属の引張強さ及び吸収エネルギーが低値であった。また、Ｎｉ及びＭｏの１種または２種が少ないので、溶着金属の引張強さ及び吸収エネルギーの向上効果は得られなかった。 Since the wire symbol B6 has a small amount of Mn, crater cracking occurs, and the tensile strength and absorbed energy of the weld metal are low. Further, since one or two types of Ni and Mo are small, the effect of improving the tensile strength and absorption energy of the weld metal could not be obtained.
ワイヤ記号Ｂ７は、Ｔｉが多いので、溶着金属の引張強さが高く、吸収エネルギーが低値であった。 Since the wire symbol B7 has a large amount of Ti, the tensile strength of the weld metal is high and the absorbed energy is low.
ワイヤ記号Ｂ８は、Ｍｎが多いので、溶着金属の引張強さが高く、吸収エネルギーが低値であった。また、Ａｌ2Ｏ3換算値の合計が少ないので、アークが不安定でスパッタ発生量が多く、ビード形状やビード外観が不良であった。 Since the wire symbol B8 has a large amount of Mn, the tensile strength of the weld metal is high and the absorbed energy is low. In addition, since the total of Al 2 O 3 conversion values was small, the arc was unstable, the amount of spatter generated was large, and the bead shape and bead appearance were poor.
ワイヤ記号Ｂ９は、Ｔｉが少ないので、溶着金属の吸収エネルギーが低値であった。また、Ｍｇが少ないので、アークが不安定であった。 Since the wire symbol B9 has a small amount of Ti, the absorbed energy of the weld metal is low. Moreover, since the amount of Mg was small, the arc was unstable.
ワイヤ記号Ｂ１０は、Ａｌが多いので、溶着金属の吸収エネルギーが低値であった。 Since the wire symbol B10 contains a large amount of Al, the absorbed energy of the weld metal is low.
ワイヤ記号Ｂ１１は、Ｃｕが多いので、クレータ割れが生じ、溶着金属の吸収エネルギーが低値であった。 Since the wire symbol B11 contains a large amount of Cu, crater cracking occurs and the absorbed energy of the weld metal is low.
ワイヤ記号Ｂ１２は、Ｃｕが少ないので、溶着金属の吸収エネルギーが低値であった。 Since the wire symbol B12 has a small amount of Cu, the absorbed energy of the weld metal is low.
ワイヤ記号Ｂ１３は、ＳｉＯ2換算値の合計が多いので、溶着金属の吸収エネルギーが低値であった。 Since the wire symbol B13 has a large total of SiO 2 conversion values, the absorbed energy of the weld metal is low.
ワイヤ記号Ｂ１４は、Ｍｇが多いので、アークが不安定でスパッタ発生量が多かった。また、Ｎｉ及びＭｏの１種または２種が多いので、溶着金属の引張強さが高く、吸収エネルギーが低値であった。 Since the wire symbol B14 contains a large amount of Mg, the arc is unstable and the amount of spatter generated is large. Further, since there are many 1 or 2 types of Ni and Mo, the tensile strength of the weld metal is high and the absorption energy is low.
ワイヤ記号Ｂ１５は、ＳｉＯ2換算値の合計が少ないので、スラグ剥離性が不良で、ビード形状やビード外観も不良であった。また、溶着金属の吸収エネルギーが低値であった。 Since the total of the SiO 2 conversion values of the wire symbol B15 is small, the slag peelability is poor, and the bead shape and the bead appearance are also poor. In addition, the absorbed energy of the weld metal was low.
Claims (2)
ワイヤ全質量に対する質量％で、鋼製外皮とフラックスの合計で、
Ｃ：０．０５〜０．１０％、
Ｓｉ：０．７〜２．０％、
Ｍｎ：１．３〜３．０％、
Ｔｉ：０．０１〜０．３％、
Ｃｕ：０．０５〜０．４５％を含有し、
Ａｌ：０．１０％以下であり、
さらに、ワイヤ全質量に対する質量％で、フラックス中に
Ｓｉ酸化物のＳｉＯ2換算値の合計：０．２１〜０．６０％、
Ａｌ酸化物のＡｌ2Ｏ3換算値の合計：０．１０〜０．３５％、
Ｍｇ：０．０５〜０．２０％、
Ｎａ化合物及びＫ化合物のＮａ2Ｏ換算値とＫ2Ｏ換算値の合計：０．０３〜０．２５％を含有し、
残部が鋼製外皮のＦｅ、鉄粉、鉄合金粉のＦｅ分及び不可避不純物からなることを特徴とする炭酸ガスシールドアーク溶接用メタル系フラックス入りワイヤ。 In a metal-based flux-cored wire for carbon dioxide gas shielded arc welding, which is made by filling a steel outer skin with flux,
Mass% of total wire mass, total of steel skin and flux,
C: 0.05 to 0.10%,
Si: 0.7-2.0%,
Mn: 1.3-3.0%,
Ti: 0.01-0.3%,
Cu: contains 0.05 to 0.45%,
Al: 0.10% or less,
Further, in mass% with respect to the total mass of the wire, the sum of the SiO 2 equivalent values of the Si oxide in the flux: 0.21 to 0.60%,
Total Al 2 O 3 conversion value of Al oxide: 0.10 to 0.35%,
Mg: 0.05 to 0.20%,
The total of Na 2 O conversion value and K 2 O conversion value of Na compound and K compound: 0.03 to 0.25% is contained.
A metal-based flux-cored wire for carbon dioxide gas shielded arc welding, characterized in that the balance is composed of Fe, iron powder, iron alloy powder Fe, and unavoidable impurities of a steel outer skin.
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