JP5283993B2 - Flux-cored wire for titania-based gas shielded arc welding - Google Patents

Flux-cored wire for titania-based gas shielded arc welding Download PDF

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JP5283993B2
JP5283993B2 JP2008179040A JP2008179040A JP5283993B2 JP 5283993 B2 JP5283993 B2 JP 5283993B2 JP 2008179040 A JP2008179040 A JP 2008179040A JP 2008179040 A JP2008179040 A JP 2008179040A JP 5283993 B2 JP5283993 B2 JP 5283993B2
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JP2010017733A (en
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正行 永見
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Kobe Steel Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • B23K35/0266—Rods, electrodes, wires flux-cored
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3607—Silica or silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3608—Titania or titanates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/361—Alumina or aluminates

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Nonmetallic Welding Materials (AREA)

Description

本発明は軟鋼、高張力鋼又は低合金鋼等の溶接に使用されるチタニヤ系ガスシールドアーク溶接用フラックス入りワイヤに関し、特に高電流域における立向上進性能に優れ、溶接金属性能を向上させたチタニヤ系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。   The present invention relates to a flux-cored wire for titania-based gas shielded arc welding used for welding mild steel, high-tensile steel, low-alloy steel, and the like, and particularly has excellent stand-up performance in a high current region and improved weld metal performance. The present invention relates to a flux-cored wire for titania-based gas shielded arc welding.

溶接に用いられるフラックス入りワイヤは、ソリッドワイヤと比較してビード外観が美しく、発生スパッタ量が少なく、更に、溶着効率が高い等の特徴が評価され、その使用量が年々増加しており、特に造船分野における溶接においてフラックス入りワイヤの使用比率は最も高い。造船分野においてはその活況な需要に対応するために自動化及び高能率化に対する取り組みがなされてきており、その一例として下向溶接及び水平すみ肉溶接における多電極溶接による高能率化（特許文献１）、又は溶接ロボットによる自動化・省人化（特許文献２）が挙げられ、それらに適した溶接材料も数多く開発されてきた。しかし、立向上進溶接についてはその溶接姿勢上、溶接ロボット及び装置等を導入することによって自動化並びに省人化を図ることができる工程は限られている。更に、ロボット及び装置等を使用しない半自動溶接においても立向上進溶接は極めて高度な溶接技量が必要とされる溶接姿勢であるため、溶接の高能率化及び脱技能化が図り難いものであった。   The flux-cored wire used for welding has a beautiful bead appearance, less spatter generation, and high welding efficiency, compared to solid wire, and its usage is increasing year by year. The use ratio of flux cored wire is the highest in welding in the shipbuilding field. In the shipbuilding field, efforts have been made to automate and improve the efficiency in order to meet the brisk demand. As one example, the improvement in efficiency is achieved by multi-electrode welding in downward welding and horizontal fillet welding (Patent Document 1). Or, automation and labor saving by a welding robot (Patent Document 2) can be cited, and many welding materials suitable for them have been developed. However, with regard to the stand-up advancement welding, there are limited processes that can be automated and labor-saving by introducing a welding robot, apparatus, and the like due to the welding posture. Furthermore, even in semi-automatic welding that does not use robots and equipment, the stand-up advance welding is a welding posture that requires a very high level of welding skill, so that it is difficult to improve the efficiency and dismantling of welding. .

立向上進溶接における溶接作業性を向上させるために、例えば特許文献３には、Ａｌ２Ｏ３、ＭｇＯ及びＺｒＯ２を必須成分として多量に含有し、溶接電流を高くして溶接を行っても溶融金属及びスラグの垂れ落ち及びビード形状の不良が発生しないガスシールドアーク溶接用フラックス入りワイヤが開示されている。また、特許文献４には、全姿勢溶接における溶接作業性、スラグ剥離性及び溶接金属の衝撃性能を維持しつつ、立向上進溶接性を向上させたチタニヤ系アーク溶接用フラックス入りワイヤが開示されている。 In order to improve the welding workability in vertical advance welding, for example, Patent Document 3 contains a large amount of Al 2 O 3 , MgO and ZrO 2 as essential components, and welding is performed with a high welding current. A flux-cored wire for gas shielded arc welding is disclosed in which molten metal and slag sag and defective bead shape do not occur. Patent Document 4 discloses a flux-cored wire for titania-based arc welding that has improved weldability while maintaining welding workability, slag peelability and weld metal impact performance in all-position welding. ing.

更に、特許文献５にはＴｉ酸化物、ＳｉＯ２、ＺｒＯ２、Ｋ２Ｏ、フッ化物、Ａｌ２Ｏ３、Ａｌ、Ｓｉ、及びＭｎを含有し、ワイヤ全質量あたりＳｉのＭｎに対する含有量比［Ｓｉ］／［Ｍｎ］が２．３乃至５．０であるガスシールドアーク溶接用フラックス入りワイヤが開示されている。また、特許文献５に記載のワイヤを用いてガスシールドアーク溶接を行うと、発生アークの安定性が得られるため発生スパッタ量が少なく、更に、溶融スラグ及び溶融金属の垂れを抑制することができることが記載されている。 Further, Patent Document 5 contains Ti oxide, SiO 2 , ZrO 2 , K 2 O, fluoride, Al 2 O 3 , Al, Si, and Mn, and the content ratio of Si to Mn per total wire mass A flux-cored wire for gas shielded arc welding in which [Si] / [Mn] is 2.3 to 5.0 is disclosed. In addition, when gas shielded arc welding is performed using the wire described in Patent Document 5, the stability of the generated arc is obtained, so that the amount of generated spatter is small, and further, dripping of molten slag and molten metal can be suppressed. Is described.

更にまた、特許文献６には、フラックス中に含まれるＴｉ酸化物、Ｓｉ酸化物、Ｆｅ酸化物、Ｚｒ酸化物、Ａｌ酸化物、Ｎａ、Ｋ、フッ化物、及びＭｇ含有量、並びにフラックス及び外皮中に含まれるＣ、Ｓｉ、Ｍｎ、及びＡｌ含有量を特定することによって、立向上進溶接においてもメタル垂れが発生しにくく、他の溶接姿勢においても溶接作業性が良好なガスシールドアーク溶接用フラックス入りワイヤが開示されている。また、特許文献６に記載のガスシールドアーク溶接用フラックス入りワイヤを使用すると、低温靱性が優れた溶接金属が得られるため、溶接の高能率化及び溶接部の品質が向上できることが記載されている。   Furthermore, Patent Document 6 discloses the contents of Ti oxide, Si oxide, Fe oxide, Zr oxide, Al oxide, Na, K, fluoride, and Mg contained in the flux, and the flux and outer shell. By specifying the C, Si, Mn, and Al contents contained in the gas shield arc welding, metal sag is unlikely to occur even in vertical welding, and welding workability is good even in other welding positions. A flux-cored wire is disclosed. Further, it is described that when a flux-cored wire for gas shielded arc welding described in Patent Document 6 is used, a weld metal having excellent low-temperature toughness can be obtained, so that the efficiency of welding and the quality of the welded portion can be improved. .

特開平６−３１２２６７号公報JP-A-6-31267 特開平５−１６９２６３号公報JP-A-5-169263 特開平８−９９１９２号公報JP-A-8-99192 特開２００４−３４０７８号公報JP 2004-34078 A 特開２００５−３０５５３１号公報JP 2005-305531 A 特開２００５−３１９５０８号公報JP-A-2005-319508

しかしながら、前述の従来技術には以下のような問題点がある。   However, the above-described prior art has the following problems.

特許文献３及び４に記載のフラックス入りワイヤを使用して溶接を行うと、立向上進すみ肉溶接の高溶接電流域において、スラグ又は溶接金属の粘性不足によって溶融金属の垂れ落ちが発生しやすくビード形状が不良となるため、造船分野等における作業者のワイヤ使用条件範囲が狭くなる。また、特許文献３及び４に記載のフラックス入りワイヤは、溶接時のスパッタの発生量が依然多いものである。   When welding is performed using the flux-cored wires described in Patent Documents 3 and 4, dripping of the molten metal is likely to occur due to insufficient viscosity of the slag or weld metal in the high welding current region of the fillet welding for improving the vertical direction. Since the bead shape is poor, the range of wire usage conditions for workers in the shipbuilding field and the like is narrowed. Moreover, the flux-cored wires described in Patent Documents 3 and 4 still have a large amount of spatter generated during welding.

また、特許文献５に記載のガスシールドアーク溶接用フラックス入りワイヤは、高融点スラグ生成剤であるＴｉＯ２及びＡｌ２Ｏ３のスラグ生成剤全体における含有量の割合が小さく、スラグの流動性が増して溶融金属を保持できない場合がある。また、Ａｌ２Ｏ３の含有量がワイヤ全質量あたり０．５質量％以下と少ないため、スラグの粘性不足によって溶接作業時にスラグの垂れ落ちが発生しやすくなる。 Further, the flux-cored wire for gas shielded arc welding described in Patent Document 5 has a small content ratio of TiO 2 and Al 2 O 3 which are high melting point slag forming agents in the entire slag forming agent, and the flowability of slag is low. In some cases, the molten metal cannot be retained. Moreover, since the content of Al 2 O 3 is as small as 0.5% by mass or less per the total mass of the wire, the slag droops easily during welding work due to insufficient viscosity of the slag.

更に、特許文献６に記載のガスシールドアーク溶接用フラックス入りワイヤはＭｇの含有量がワイヤ全質量あたり０．１乃至０．５質量％と少ないため、脱酸不足により粘性が低下し、溶接金属の垂れ落ちが発生しやすくなる。   Furthermore, since the flux-cored wire for gas shielded arc welding described in Patent Document 6 has a low Mg content of 0.1 to 0.5% by mass per total mass of the wire, the viscosity decreases due to insufficient deoxidation, and the weld metal It is easy for dripping to occur.

本発明はかかる問題点に鑑みてなされたものであって、立向上進溶接において高い溶接電流を使用しても溶融スラグ及び溶融金属の垂れ落ちがなく、スパッタ発生量が少ない溶接性が得られ、更に機械的性質が優れた溶接金属を得ることができるチタニヤ系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。   The present invention has been made in view of such a problem, and even when a high welding current is used in vertical welding, there is no dripping of molten slag and molten metal, and weldability with less spatter generation is obtained. Another object of the present invention is to provide a flux-cored wire for titania-based gas shielded arc welding that can obtain a weld metal having excellent mechanical properties.

本発明に係るチタニヤ系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、高張力鋼又は低合金鋼製の金属外皮にフラックスを充填したチタニヤ系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、ワイヤ全質量あたり、ＴｉＯ２：６．０乃至１２．０質量％、Ａｌ２Ｏ３：０．７乃至１．０質量％、ＳｉＯ２：０．６乃至１．０質量％、ＺｒＯ２：０．１乃至０．３質量％、を含有し、更に、金属又は合金としてＭｎ：１．０乃至３．０質量％（合金の場合はＭｎ換算値）、Ｓｉ：０．３乃至０．６質量％（合金の場合はＳｉ換算値）、Ａｌ：０．１乃至０．３質量％（合金の場合はＡｌ換算値）、及びＭｇ：０．６乃至０．９質量％（合金の場合はＭｇ換算値）を含有する。
The flux-cored wire for titania-based gas shielded arc welding according to the present invention is a flux-cored wire for titania-based gas shielded arc welding in which a metal sheath made of mild steel, high-tensile steel or low-alloy steel is filled with flux. , TiO 2 : 6.0 to 12.0 mass%, Al 2 O 3 : 0.7 to 1.0 mass%, SiO 2 : 0.6 to 1.0 mass%, ZrO 2 : 0.1 to 0 Further, Mn: 1.0 to 3.0% by mass (in the case of an alloy, Mn equivalent value), Si: 0.3 to 0.6% by mass (of the alloy) In the case of Si conversion value), Al: 0.1 to 0.3 mass% (Al conversion value in the case of alloy), and Mg: 0.6 to 0.9 mass% (Mg conversion value in the case of alloy) contains.

そして、ＴｉＯ２含有量を［ＴｉＯ２］、Ａｌ２Ｏ３含有量を［Ａｌ２Ｏ３］、ＳｉＯ２含有量を［ＳｉＯ２］、ＺｒＯ２含有量を［ＺｒＯ２］、金属又は合金としてのＭｎ含有量（合金の場合はＭｎ換算値）を［Ｍｎ］、金属又は合金としてのＳｉ含有量（合金の場合はＳｉ換算値）を［Ｓｉ］、金属又は合金としてのＭｇ含有量（合金の場合はＭｇ換算値）を［Ｍｇ］、Ｎａ含有量（化合物又は合金の場合はＮａ換算値）を［Ｎａ］、Ｋ含有量（化合物又は合金の場合はＫ換算値）［Ｋ］とするとき、ＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和［ＴｉＯ２］＋［Ａｌ２Ｏ３］＋［ＳｉＯ２］＋［ＺｒＯ２］が８．０乃至１３．５質量％、ＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和に対するＴｉＯ２及びＡｌ２Ｏ３含有量の和の比（［ＴｉＯ２］＋［Ａｌ２Ｏ３］）／（［ＴｉＯ２］＋［Ａｌ２Ｏ３］＋［ＳｉＯ２］＋［ＺｒＯ２］）が０．８５乃至０．９５、Ｓｉ含有量に対するＭｎ及びＭｇ含有量の積の比［Ｍｎ］×［Ｍｇ］／［Ｓｉ］が２．０乃至４．０、Ｎａ及びＫ含有量の和［Ｎａ］＋［Ｋ］が０．１５乃至０．２５質量％、Ｋ含有量に対するＮａ含有量の比［Ｎａ］／［Ｋ］が０．２０乃至０．４０である。 The TiO 2 content is [TiO 2 ], the Al 2 O 3 content is [Al 2 O 3 ], the SiO 2 content is [SiO 2 ], the ZrO 2 content is [ZrO 2 ], a metal or an alloy. Mn content (Mn equivalent value in case of alloy) is [Mn], Si content as metal or alloy (Si equivalent value in case of alloy) is [Si], Mg content as metal or alloy (alloy) In the case of Mg, the Mg equivalent value is [Mg], the Na content (Na equivalent value in the case of a compound or alloy) is [Na], and the K content (K equivalent value in the case of a compound or alloy) [K]. When the total content of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 [TiO 2 ] + [Al 2 O 3 ] + [SiO 2 ] + [ZrO 2 ] is 8.0 to 13.5 mass %, TiO 2, Al 2 O 3, SiO 2, and ZrO The ratio of the sum of TiO 2 and Al 2 O 3 content to the sum of the content ([TiO 2] + [Al 2 O 3]) / ([TiO 2] + [Al 2 O 3] + [SiO 2] + [ZrO 2 ]) is 0.85 to 0.95, the ratio of the product of Mn and Mg content to Si content is [Mn] × [Mg] / [Si] is 2.0 to 4.0, Na and K The sum [Na] + [K] of the content is 0.15 to 0.25% by mass, and the ratio [Na] / [K] of the Na content to the K content is 0.20 to 0.40.

更に、上記チタニヤ系ガスシールドアーク溶接用フラックス入りワイヤはワイヤ全質量あたり、Ｔｉ、Ｚｒ、Ｃｕ、Ｃｒ、Ｎｂ及びＶのうち、１種以上を総計で０．５質量％以下含有することができる。   Further, the flux-cored wire for titania-based gas shielded arc welding can contain one or more of Ti, Zr, Cu, Cr, Nb and V in total 0.5 mass% or less per total mass of the wire. .

本発明によれば、チタニヤ系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、高い溶接電流を使用した立向上進溶接においても、溶融部が耐ビード垂れ性及びスパッタ抑制性に優れているため、高い溶接作業性を得ることができる。更に、機械的性質が優れた溶接部を得ることができるチタニヤ系ガスシールドアーク溶接用フラックス入りワイヤを得ることができる。   According to the present invention, in a flux-cored wire for titania-based gas shielded arc welding, since the fusion zone is excellent in bead sagging resistance and spatter suppression even in vertical improvement welding using a high welding current, high welding is achieved. Workability can be obtained. Furthermore, a flux-cored wire for titania-based gas shielded arc welding that can obtain a weld having excellent mechanical properties can be obtained.

本願発明者は、立向上進溶接姿勢においてビード形状不良の原因となる溶融金属の垂れ落ちを防止するためスラグの組成を変更し、更に、スラグの凝固点を高める手段を検討した。   The inventor of the present application has studied a means for changing the composition of the slag in order to prevent dripping of the molten metal that causes the bead shape failure in the vertical improvement welding posture and further increasing the freezing point of the slag.

溶融金属が垂れ落ちないように溶接域に保持するためには、スラグ生成剤であるＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２の添加量が多いほうが有利である。また、スラグの特性を高融点及び高粘性にするためには、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２の添加が有効である。本願発明者は、各スラグ形成剤の特性を調査し、特にＭｇＯがスラグの剥離性を劣化させ、また、ＺｒＯ２がスパッタ発生量を増加させ、更にＳｉＯ２がスラグの流動性を向上させる作用を有することを見出した。また、ＴｉＯ２及びＡｌ２Ｏ３にはスラグの剥離性の劣化、スパッタ発生量の増加、及びスラグの粘性の上昇作用があることを見出した。そして、これらのスラグ生成剤の適正な含有量を調整することによって、特にＴｉＯ２及びＡｌ２Ｏ３の含有量をＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２の合計含有量に対して特定することによって、高融点スラグを形成し、溶融金属の垂れ落ちを効果的に防止することができることを見出した。 In order to hold the molten metal in the weld zone so as not to sag, it is advantageous that the amount of slag-forming agents TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 is increased. In order to make the slag characteristics have a high melting point and high viscosity, the addition of Al 2 O 3 , SiO 2 , and ZrO 2 is effective. The inventor of the present application investigates the characteristics of each slag forming agent, in particular, MgO deteriorates the slag peelability, ZrO 2 increases the amount of spatter generation, and SiO 2 improves the slag fluidity. It was found to have Further, it has been found that TiO 2 and Al 2 O 3 have the effects of deterioration of slag removability, increase in the amount of spatter generated, and increase in slag viscosity. And by adjusting the appropriate content of these slag forming agents, the content of TiO 2 and Al 2 O 3 in particular is made to the total content of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2. It was found that a high melting point slag can be formed and the dripping of the molten metal can be effectively prevented.

また、本願発明者は溶融金属の適正な組成を検討し、溶接金属の強度及び靭性を低下させることなく溶融金属の粘性を上昇させ、溶融金属の溶接部からの垂れ落ちを防止する手段を見出した。即ち、脱酸剤として添加するＡｌ及びＳｉの添加量を特定することによって、Ａｌの添加による溶接金属の靭性の低下、並びにＳｉの添加によるスラグ凝固点降下、溶接金属の強度の増加、及び靭性の低下を防止しながら、強脱酸剤であるＭｎ及びＭｇをＳｉに対する添加比率によって適正化することによって溶融金属中の酸素量を低下させることができることを見出した。   Further, the inventors of the present application have studied the proper composition of the molten metal, and have found a means for increasing the viscosity of the molten metal without reducing the strength and toughness of the weld metal and preventing dripping of the molten metal from the weld. It was. That is, by specifying the amount of Al and Si to be added as a deoxidizer, the toughness of the weld metal is reduced by the addition of Al, and the slag solidification point is lowered by the addition of Si, the strength of the weld metal is increased, and the toughness is increased. It has been found that the amount of oxygen in the molten metal can be reduced by optimizing Mn and Mg, which are strong deoxidizers, with the addition ratio to Si while preventing the decrease.

更に、溶融プールの振動を抑制することが溶融金属の垂れ落ちを防止することに有効であり、アーク安定性を向上させるアルカリ金属であるＮａ並びにＫの含有量の総計（Ｎａ及びＫが化合物又は合金として存在する場合は夫々Ｎａ及びＫ換算値）及び比率を調整することが効果的であり、また、Ｎａ及びＫの含有量を調整することがスパッタ発生量の低減にも効果的であることを見出した。   Further, suppressing vibration of the molten pool is effective in preventing dripping of the molten metal, and the total content of Na and K, which are alkali metals that improve arc stability (Na and K are compounds or When present as an alloy, it is effective to adjust the Na and K conversion values) and ratio, and adjusting the Na and K contents is also effective in reducing the amount of spatter generated. I found.

以下、本発明の数値限定の理由について説明する。   Hereinafter, the reason for the numerical limitation of the present invention will be described.

「ＴｉＯ２含有量［ＴｉＯ２］：６．０乃至１２．０質量％」
ＴｉＯ２はスラグ形成剤及びアーク安定剤として作用する。ＴｉＯ２の含有量が６．０質量％未満であると、溶接金属を支えるだけのスラグ発生量を確保できず、溶融金属が垂れ落ちやすくなる。一方、ＴｉＯ２の含有量が１２．０質量％を超えると、スラグ生成量が過剰となってスラグが溶接部から垂れ落ちやすくなり、溶接部にスラグ巻き込みが発生しやすくなる。従って、ＴｉＯ２の含有量は６．０乃至１２．０質量％である。 “TiO 2 content [TiO 2 ]: 6.0 to 12.0 mass%”
TiO 2 acts as a slag former and arc stabilizer. When the content of TiO 2 is less than 6.0% by mass, a slag generation amount sufficient to support the weld metal cannot be secured, and the molten metal tends to sag. On the other hand, when the content of TiO 2 exceeds 12.0% by mass, the amount of slag generated becomes excessive, and the slag is likely to sag from the welded portion, and the slag is likely to be caught in the welded portion. Therefore, the content of TiO 2 is 6.0 to 12.0% by mass.

「Ａｌ２Ｏ３含有量［Ａｌ２Ｏ３］：０．７乃至１．０質量％」
Ａｌ２Ｏ３にはスラグの凝固点を上昇させ、スラグの粘性を上昇させる作用がある。Ａｌ２Ｏ３の含有量が０．７質量％未満であると、スラグの凝固点を上昇させる効果が得られず、Ａｌ２Ｏ３の含有量が１．０質量％を超えるとスパッタの発生量が増加する。従って、Ａｌ２Ｏ３の含有量は０．７乃至１．０質量％である。 “Al 2 O 3 content [Al 2 O 3 ]: 0.7 to 1.0 mass%”
Al 2 O 3 has the effect of increasing the freezing point of slag and increasing the viscosity of slag. If the content of Al 2 O 3 is less than 0.7% by mass, the effect of increasing the freezing point of the slag cannot be obtained. If the content of Al 2 O 3 exceeds 1.0% by mass, the amount of spatter generated Will increase. Therefore, the content of Al 2 O 3 is 0.7 to 1.0% by mass.

「ＳｉＯ２含有量［ＳｉＯ２］：０．６乃至１．０質量％」
ＳｉＯ２はスラグ形成材及びアーク安定剤として作用する。ＳｉＯ２の含有量が０．６質量％未満であるとアークが不安定になってスパッタの発生量が増加する。一方、ＳｉＯ２の含有量が１．０質量％を超えると、スラグの凝固点が降下し、溶融金属が溶接部から垂れ落ちやすくなる。従って、ＳｉＯ２の含有量は０．６乃至１．０質量％である。 “SiO 2 content [SiO 2 ]: 0.6 to 1.0 mass%”
SiO 2 acts as a slag former and arc stabilizer. When the content of SiO 2 is less than 0.6% by mass, the arc becomes unstable and the amount of spatter generated increases. On the other hand, when the content of SiO 2 exceeds 1.0% by mass, the freezing point of the slag is lowered, and the molten metal tends to sag from the welded portion. Therefore, the content of SiO 2 is 0.6 to 1.0% by mass.

「ＺｒＯ２含有量［ＺｒＯ２］：０．１乃至０．３質量％」
ＺｒＯ２はスラグの凝固点を上昇させ、スラグの流動性を増加させる作用がある。ＺｒＯ２の含有量が０．１質量％未満であるとスラグの凝固が遅くなり、ＺｒＯ２の含有量が０．３質量％を超えるとスパッタの発生が増加すると共にスラグの粘性が低下する。従って、ＺｒＯ２の含有量は０．１乃至０．３質量％である。 “ZrO 2 content [ZrO 2 ]: 0.1 to 0.3 mass%”
ZrO 2 has the effect of increasing the freezing point of the slag and increasing the fluidity of the slag. When the content of ZrO 2 is less than 0.1% by mass, solidification of the slag is delayed, and when the content of ZrO 2 exceeds 0.3% by mass, the generation of spatter increases and the viscosity of the slag decreases. Therefore, the content of ZrO 2 is 0.1 to 0.3% by mass.

「金属又は合金としてのＭｎ含有量（合金の場合はＭｎ換算値）［Ｍｎ］：１．０乃至３．０質量％」
Ｍｎは金属又はＦｅ−Ｍｎ及びＦｅ−Ｓｉ−Ｍｎ等の鉄合金等によって添加される。Ｍｎは脱酸剤として作用し、溶接金属における引張強度及び靭性を高める作用がある。Ｍｎの含有量が１．０質量％未満であると脱酸不足によって粘性が低下し、溶融金属の垂れ落ちが発生しやすくなる。また、溶接部にブローホール等の溶接欠陥が発生して、強度及び靭性が低下しやすくなる。Ｍｎの含有量が３．０質量％を超えると溶接金属の強度が高くなりすぎる。従って、金属又は合金としてのＭｎの含有量は１．０乃至３．０質量％である。 “Mn content as metal or alloy (Mn equivalent value in case of alloy) [Mn]: 1.0 to 3.0 mass%”
Mn is added by a metal or an iron alloy such as Fe-Mn and Fe-Si-Mn. Mn acts as a deoxidizer and has the effect of increasing the tensile strength and toughness of the weld metal. When the content of Mn is less than 1.0% by mass, the viscosity is lowered due to insufficient deoxidation, and dripping of the molten metal is likely to occur. In addition, weld defects such as blow holes are generated in the welded portion, and the strength and toughness are likely to decrease. If the Mn content exceeds 3.0% by mass, the strength of the weld metal becomes too high. Therefore, the content of Mn as a metal or alloy is 1.0 to 3.0% by mass.

「金属又は合金としてのＳｉ含有量（合金の場合はＳｉ換算値）［Ｓｉ］：０．３乃至０．６質量％」
Ｓｉは金属又はＦｅ−Ｓｉ、Ｆｅ−Ｓｉ−Ｍｎ及びＣａ−Ｓｉ等の合金によって添加される。Ｓｉは脱酸剤として作用し、溶接金属における引張強度を向上させる作用を有する。Ｓｉの含有量が０．３質量％未満であると、脱酸不足によって粘性が低下し、溶融金属の垂れ落ちが発生しやすくなる。また、溶接部にブローホール等の溶接欠陥が発生しやすくなる。Ｓｉの含有量が０．６質量％を超えると、溶接金属の引張強度が高くなり、靭性が低下する。従って、金属又は合金としてのＳｉの含有量は０．３乃至０．６質量％である。 “Si content as metal or alloy (Si equivalent in case of alloy) [Si]: 0.3 to 0.6 mass%”
Si is added by a metal or an alloy such as Fe-Si, Fe-Si-Mn and Ca-Si. Si acts as a deoxidizer and has the effect of improving the tensile strength of the weld metal. When the Si content is less than 0.3% by mass, the viscosity is lowered due to insufficient deoxidation, and dripping of the molten metal is likely to occur. In addition, welding defects such as blow holes are likely to occur in the welded portion. If the Si content exceeds 0.6% by mass, the tensile strength of the weld metal increases and the toughness decreases. Therefore, the content of Si as a metal or alloy is 0.3 to 0.6% by mass.

「金属又は合金としてのＡｌ含有量（合金の場合はＡｌ換算値）：０．１乃至０．３質量％」
Ａｌは金属又はＦｅ−Ａｌ等の合金によって添加される。Ａｌは脱酸剤及びスラグ形成剤として作用する。Ａｌの含有量が０．１質量％未満であると、脱酸剤及びスラグ形成剤不足によって溶融金属の垂れ落ちが発生しやすくなる。一方、Ａｌの含有量が０．３質量％を超えると、溶融金属が過度に溶接部に析出するため溶接金属の靭性が低下する。従って、金属又は合金としてのＡｌの含有量は０．１乃至０．３質量％である。 “Al content as metal or alloy (in the case of alloy, Al conversion value): 0.1 to 0.3 mass%”
Al is added by a metal or an alloy such as Fe-Al. Al acts as a deoxidizer and slag former. When the Al content is less than 0.1% by mass, the molten metal sags easily due to the lack of a deoxidizer and a slag forming agent. On the other hand, when the Al content exceeds 0.3% by mass, the molten metal is excessively precipitated in the welded portion, so that the toughness of the weld metal is lowered. Therefore, the content of Al as a metal or alloy is 0.1 to 0.3% by mass.

「金属又は合金としてのＭｇ含有量（合金の場合はＭｇ換算値）［Ｍｇ］：０．６乃至０．９質量％」
Ｍｇは金属又はＡｌ−Ｍｇ及びＮｉ−Ｍｇ等の合金によって添加される。Ｍｇは強脱酸剤として作用し、Ｍｇの含有量が０．６質量％未満であると、脱酸不足によって溶接金属の粘性が低下して溶融金属が溶接部から垂れ落ちやすくなると共に、溶接金属の靭性が低下する。一方、Ｍｇの含有量が０．９質量％を超えると、脱酸生成物であるＭｇＯが溶融スラグ中に過剰に増加して溶融金属が溶接部から垂れ落ちやすくなり、スパッタ発生量も増加する。従って、金属又は合金としてのＭｇの含有量は０．６乃至０．９質量％である。 "Mg content as metal or alloy (Mg in case of alloy) [Mg]: 0.6 to 0.9 mass%"
Mg is added by a metal or an alloy such as Al—Mg and Ni—Mg. Mg acts as a strong deoxidizer, and if the Mg content is less than 0.6% by mass, the weld metal viscosity decreases due to insufficient deoxidation and the molten metal tends to sag from the weld, and welding Metal toughness decreases. On the other hand, if the Mg content exceeds 0.9% by mass, MgO, which is a deoxidation product, excessively increases in the molten slag, and the molten metal tends to sag from the welded portion, resulting in an increase in spatter generation. . Therefore, the content of Mg as a metal or alloy is 0.6 to 0.9% by mass.

「ＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和［ＴｉＯ２］＋［Ａｌ２Ｏ３］＋［ＳｉＯ２］＋［ＺｒＯ２］：８．０乃至１３．５質量％」
ＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２はスラグ生成剤であり、スラグ生成量はこのスラグ生成剤の総和によって変化する。ＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和が８．０質量％未満であると、スラグ生成剤が不足するため溶融金属の垂れ落ちが発生しやすくなる。一方、ＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和が１３．５質量％を超えると、スラグ生成剤量が過多となってスラグ生成量が増加し、スラグが溶接部から垂れ落ちやすくなる。また、スラグの生成量が多いと溶接部にスパッタが発生しやすくなり、また、スラグ巻き込み等の欠陥が発生しやすくなる。従って、ＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和は８．０乃至１３．５質量％である。 “Total of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 content [TiO 2 ] + [Al 2 O 3 ] + [SiO 2 ] + [ZrO 2 ]: 8.0 to 13.5 mass% "
TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 are slag generating agents, and the amount of slag generation varies depending on the sum of the slag generating agents. When the total content of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 is less than 8.0% by mass, the slag generator is insufficient, and the molten metal is likely to sag. On the other hand, when the total content of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 exceeds 13.5% by mass, the amount of slag generating agent becomes excessive and the amount of slag generated increases, and the slag is welded. It becomes easy to droop from. Moreover, when there is much production amount of slag, it will become easy to generate | occur | produce a spatter in a welding part, and defects, such as slag entrainment, will occur easily. Accordingly, the total content of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 is 8.0 to 13.5% by mass.

「ＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和に対するＴｉＯ２及びＡｌ２Ｏ３含有量の和の比（［ＴｉＯ２］＋［Ａｌ２Ｏ３］）／（［ＴｉＯ２］＋［Ａｌ２Ｏ３］＋［ＳｉＯ２］＋［ＺｒＯ２］）：０．８５乃至０．９５」
ＴｉＯ２及びＡｌ２Ｏ３は高融点スラグを生成する成分であり、スラグの流動性及び剥離性を変化させる効果がある。このＴｉＯ２及びＡｌ２Ｏ３の含有量をスラグ生成剤の含有量の総和に対する割合によって規定することによって、スラグの流動性及び剥離性が最適化され、スラグ剥離性の低下及びスパッタ発生量の増加を防止することが可能となるため、立向上進溶接の作業性を向上させることができる。ＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和に対するＴｉＯ２及びＡｌ２Ｏ３含有量の和の比が０．８５未満であると、スラグの流動性が増してスラグが溶融金属を保持することができなくなるため、溶融金属が溶接部から垂れ落ちやすくなる。一方、ＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和に対するＴｉＯ２及びＡｌ２Ｏ３含有量の和の比が０．９５を超えると、スラグの剥離性が低下するため、スラグが溶接部にて焼き付きやすくなる。従って、ＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和に対するＴｉＯ２及びＡｌ２Ｏ３含有量の和の比は０．８５乃至０．９５である。 “Ratio of the sum of TiO 2 and Al 2 O 3 content to the sum of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 content ([TiO 2 ] + [Al 2 O 3 ]) / ([TiO 2 ] + [Al 2 O 3 ] + [SiO 2 ] + [ZrO 2 ]): 0.85 to 0.95 ”
TiO 2 and Al 2 O 3 are components that generate high-melting-point slag, and have an effect of changing the fluidity and peelability of the slag. By defining the content of TiO 2 and Al 2 O 3 by the ratio to the sum of the contents of the slag generating agent, the fluidity and peelability of the slag are optimized, the slag peelability is reduced, and the amount of spatter generated is reduced. Since it is possible to prevent the increase, the workability of the vertical improvement welding can be improved. If the ratio of the sum of the TiO 2 and Al 2 O 3 contents to the sum of the TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 contents is less than 0.85, the fluidity of the slag is increased and the slag is increased. Since it becomes impossible to hold | maintain a molten metal, a molten metal becomes easy to sag from a welding part. On the other hand, if the ratio of the sum of the TiO 2 and Al 2 O 3 contents to the sum of the TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 contents exceeds 0.95, the slag peelability is reduced. , The slag is easily seized at the weld. Therefore, the ratio of the sum of the TiO 2 and Al 2 O 3 contents to the sum of the TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 contents is 0.85 to 0.95.

「Ｓｉ含有量に対するＭｎ及びＭｇ含有量（Ｍｎ、Ｓｉ及びＭｇは、夫々合金成分の場合はＭｎ、Ｓｉ及びＭｇ換算値）の積の比［Ｍｎ］×［Ｍｇ］／［Ｓｉ］：２．０乃至４．０」
Ｍｎ及びＭｇはＳｉに比して溶融金属の脱酸性及び粘性を上昇させる効果を有する。このＭｎ及びＭｇの含有量をＳｉの含有量に対する比によって規定することによって、溶接金属の機械的性質を低下させることなく溶融金属の脱酸性及び粘性が最適化される。Ｓｉ含有量に対するＭｎ及びＭｇ含有量の積の比が２．０未満であると、脱酸不足によって溶融金属の粘性が低下し、立向上進溶接において溶融金属の垂れ落ちが発生しやすくなり、更に溶接金属の引張強度及び靭性も低下する。一方、Ｓｉ含有量に対するＭｎ及びＭｇ含有量の積の比が４．０を超えると、脱酸過剰によって溶接金属の引張強度が過度に高くなり、耐衝撃性が低下すると共に、靱性が低下する。従って、Ｓｉ含有量に対するＭｎ及びＭｇ含有量の積の比は２．０乃至４．０である。 “Mn and Mg content with respect to Si content (Mn, Si and Mg are Mn, Si and Mg converted values in the case of alloy components, respectively) [Mn] × [Mg] / [Si]: 2. 0 to 4.0 "
Mn and Mg have the effect of increasing the deacidification and viscosity of the molten metal compared to Si. By defining the Mn and Mg contents by the ratio to the Si content, the deacidification and viscosity of the molten metal are optimized without degrading the mechanical properties of the weld metal. If the ratio of the product of Mn and Mg content to the Si content is less than 2.0, the viscosity of the molten metal decreases due to insufficient deoxidation, and dripping of the molten metal is likely to occur in the vertical improvement welding, Furthermore, the tensile strength and toughness of the weld metal are also reduced. On the other hand, when the ratio of the product of Mn and Mg content to Si content exceeds 4.0, the tensile strength of the weld metal becomes excessively high due to excessive deoxidation, impact resistance is lowered, and toughness is lowered. . Therefore, the ratio of the product of Mn and Mg content to Si content is 2.0 to 4.0.

「Ｎａ及びＫ含有量（Ｎａ及びＫは、夫々化合物又は合金の形態で存在する場合はＮａ換算値［Ｎａ］及びＫ換算値［Ｋ］）の和［Ｎａ］＋［Ｋ］：０．１５乃至０．２５質量％」
Ｎａ及びＫはアーク安定剤としての作用があり、溶融プールの振動を抑制することによって溶融金属の溶接部からの垂れ落ちを防止する。Ｎａ及びＫ含有量の和が０．１５質量％未満であると、溶融プールの振動を抑制する効果が十分に得られず、０．２５質量％を超えるとＮａ２Ｏ及びＫ２Ｏ等の低融点スラグが過剰に発生して溶融金属が溶接部から垂れ落ちやすくなる。従って、Ｎａ及びＫ含有量の和は０．１５乃至０．２５質量％である。 “Na and K content (when Na and K are present in the form of a compound or an alloy, Na converted value [Na] and K converted value [K]) [Na] + [K]: 0.15 Thru 0.25 mass% "
Na and K act as an arc stabilizer and prevent dripping of the molten metal from the welded portion by suppressing the vibration of the molten pool. If the sum of the Na and K contents is less than 0.15% by mass, the effect of suppressing the vibration of the molten pool cannot be sufficiently obtained, and if it exceeds 0.25% by mass, Na 2 O, K 2 O, etc. Low melting point slag is excessively generated and the molten metal tends to sag from the weld. Therefore, the sum of the Na and K contents is 0.15 to 0.25% by mass.

「Ｋ含有量に対するＮａ含有量（Ｎａ及びＫは、夫々化合物又は合金の形態で存在する場合はＮａ換算値［Ｎａ］及びＫ換算値［Ｋ］）の比［Ｎａ］／［Ｋ］：０．２０乃至０．４０」
Ｋはアーク集中性、Ｎａはアーク安定性を向上させる効果を有する。Ｋ含有量に対するＮａ含有量の比が０．２０未満であると、アーク安定性が劣化し、スパッタの発生量が増加すると共に、溶融金属の垂れ落ちが発生しやすくなり、０．４０を超えるとアークの集中性が増加してスパッタの発生量が増加しやすくなる。従って、Ｋ含有量に対するＮａ含有量の比は０．２０乃至０．４０である。 “Ratio of Na content to Na content (Na and K are Na converted value [Na] and K converted value [K] if they are in the form of a compound or an alloy, respectively) [Na] / [K]: 0 .20 to 0.40 "
K has the effect of improving arc concentration, and Na has the effect of improving arc stability. When the ratio of the Na content to the K content is less than 0.20, the arc stability deteriorates, the amount of spatter generated increases, and dripping of the molten metal tends to occur, exceeding 0.40. As a result, the concentration of arc increases and the amount of spatter generated tends to increase. Therefore, the ratio of Na content to K content is 0.20 to 0.40.

「Ｔｉ、Ｚｒ、Ｃｕ、Ｃｒ、Ｎｂ及びＶの内１種以上の含有量合計：０．５質量％以下」
Ｔｉ、Ｚｒ、Ｃｕ、Ｃｒ、Ｎｂ及びＶは溶接部の耐食性、高強度及び耐高温腐食性を向上させる作用がある。しかし、これらの成分が総量でワイヤ全質量あたり０．５質量％を超えると、引張強度が過剰となると共に、衝撃値も低下する。 “Total content of one or more of Ti, Zr, Cu, Cr, Nb and V: 0.5% by mass or less”
Ti, Zr, Cu, Cr, Nb and V have the effect of improving the corrosion resistance, high strength and high temperature corrosion resistance of the weld. However, if the total amount of these components exceeds 0.5% by mass per total mass of the wire, the tensile strength becomes excessive and the impact value also decreases.

本発明のチタニヤ系ガスシールドアーク溶接用フラックス入りワイヤは、上記以外の成分として外皮、Ｆｅ−Ｍｎ、及びＦｅ−Ｓｉ等の鉄合金、並びに鉄粉由来の鉄成分をワイヤ全質量あたり７０乃至９０質量％含有する。鉄成分の含有量が７０質量％を下回ると溶接金属の溶着効率が著しく低下し、９０質量％を超えると鉄成分が過剰となって他の成分の含有量が減少し、夫々の成分の添加効果が得られなくなる。また、本発明のチタニヤ系ガスシールドアーク溶接用フラックス入りワイヤには、フッ化物をワイヤ全質量あたり０．０５乃至０．１質量％含有させることができる。フッ化物の含有量が０．０５質量％未満であると、拡散性水素量の大幅な上昇を招き、０．１質量％を超えるとヒュームの増加によって溶接作業が困難となる。残部は不可逆的不純物である。   The flux-cored wire for titania-based gas shielded arc welding according to the present invention contains, as a component other than the above, an iron alloy such as an outer sheath, Fe—Mn, and Fe—Si, and an iron component derived from iron powder in an amount of 70 to 90 per total mass of the wire. Contains by mass%. If the content of the iron component is less than 70% by mass, the welding efficiency of the weld metal is remarkably reduced, and if it exceeds 90% by mass, the iron component becomes excessive and the content of other components is reduced. The effect cannot be obtained. Further, the flux-cored wire for titania-based gas shielded arc welding of the present invention can contain 0.05 to 0.1% by mass of fluoride per total mass of the wire. If the content of fluoride is less than 0.05% by mass, the amount of diffusible hydrogen is significantly increased, and if it exceeds 0.1% by mass, welding is difficult due to an increase in fume. The balance is irreversible impurities.

なお、本発明に係るチタニヤ系ガスシールドアーク溶接用フラックス入りワイヤの外皮は、被溶接材の材質に応じて適宜、軟鋼、高張力鋼又は低合金鋼等を使用することが好ましい。また、このワイヤの表面状態は特に限定されるものではなく、図１（ａ）乃至（ｄ）に示すように、ワイヤの断面形状及び径も特に限定されるものではない。そして、上述したチタニヤ系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、高張力鋼又は低合金鋼等の溶接において使用することができる。   In addition, it is preferable to use mild steel, high-tensile steel, low alloy steel, or the like as the outer sheath of the flux-cored wire for titania-based gas shielded arc welding according to the present invention depending on the material of the material to be welded. Moreover, the surface state of the wire is not particularly limited, and the cross-sectional shape and diameter of the wire are not particularly limited as shown in FIGS. And the above-mentioned flux cored wire for titania-based gas shielded arc welding can be used in welding mild steel, high-tensile steel, low alloy steel or the like.

以下、本実施形態のチタニヤ系ガスシールドアーク溶接用フラックス入りワイヤの効果を示す実施例を比較例とともに示す。   Hereinafter, examples showing the effects of the flux-cored wire for titania-based gas shielded arc welding of this embodiment will be shown together with comparative examples.

表１に示す組成(質量％)及び寸法を有するＪＩＳ Ｇ３１４１に規定される一般冷延鋼板（ＳＰＣＣ）を外皮として、この外皮内にフラックスを充填してガスシールドアーク溶接を行った。   A general cold-rolled steel sheet (SPCC) defined in JIS G3141 having the composition (mass%) and dimensions shown in Table 1 was used as an outer skin, and the outer shell was filled with a flux to perform gas shield arc welding.

フラックスは、表２に示す中から選択した材料を配合することにより組成を調整し、図１（ａ）に示すようにワイヤ全質量に対するフラックス率が１６質量％となるように外皮内に充填してワイヤ外径１．４ｍｍの実施例及び比較例のチタニヤ系ガスシールドアーク溶接用フラックス入りワイヤを作製し、このワイヤを用いて溶接を行った。そして、立向上進溶接性、スパッタ発生量及び溶接金属の機械的性質の評価を行った。各実施例及び比較例のチタニヤ系ガスシールドアーク溶接用フラックス入りワイヤの組成を表３−１乃至６に示す。   The composition of the flux is adjusted by blending a material selected from those shown in Table 2, and is filled in the outer skin so that the flux rate with respect to the total mass of the wire is 16% by mass as shown in FIG. Then, a flux-cored wire for titania-based gas shielded arc welding of Examples and Comparative Examples having a wire outer diameter of 1.4 mm was produced, and welding was performed using this wire. Then, the evaluation was made on the vertical improvement weldability, the amount of spatter generated, and the mechanical properties of the weld metal. Tables 3-1 to 6 show the compositions of the flux-cored wires for titania-based gas shielded arc welding of each example and comparative example.

Figure 0005283993
Figure 0005283993

Figure 0005283993
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立向溶接性及びスパッタ発生量の評価は、表４に示す組成を有するＪＩＳ Ｇ３１０６に規定される溶接構造用圧延鋼材（ＳＭ４９０Ａ）からなる板厚１２ｍｍ、長さ４００ｍｍの試験板を母材とし、この母材を開先のルートギャップ４ｍｍにてＴ字に交差させて配置し、この開先に対してＣＯ２をシールドガスとして供給しながらすみ肉溶接を行って評価した。なお、溶接電流値は３２０Ａ、アーク電圧は３１Ｖ、シールドガスの流量は２５Ｌ／分とし、溶接速度は８乃至１４ｃｍ／分とした。立向上進溶接におけるビードの垂れ抑制性が良好である場合を○、従来と同等以下であるものを×として表３−１乃至３−６に示す。また、スパッタ発生量が１．５ｍｇ／分未満であるものをスパッタ発生抑制性ありとして判定した。スパッタ発生抑制性が良好であるものを○、従来と同等以下であるものを×として表３−１乃至表３−６に示す。 Evaluation of vertical weldability and spatter generation amount is based on a test plate having a thickness of 12 mm and a length of 400 mm made of rolled steel for welded structure (SM490A) defined in JIS G3106 having the composition shown in Table 4, This base material was arranged so as to intersect with a T shape at a groove root gap of 4 mm, and fillet welding was performed while supplying CO 2 as a shielding gas to the groove and evaluated. The welding current value was 320 A, the arc voltage was 31 V, the shield gas flow rate was 25 L / min, and the welding speed was 8 to 14 cm / min. Tables 3-1 to 3-6 show the case where the drooping suppression property of the bead in the vertical improvement welding is good, and the case where it is equal to or less than the conventional case is shown as x. Moreover, the thing whose sputter | spatter generation amount is less than 1.5 mg / min was determined as having sputter | spatter generation | occurrence suppression property. Tables 3-1 to 3-6 show the case where the spatter generation suppressing property is good and the case where it is equal to or less than the conventional case as x.

Figure 0005283993
Figure 0005283993

Figure 0005283993
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Figure 0005283993
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Figure 0005283993
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Figure 0005283993
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Figure 0005283993
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溶接金属の機械的性質の評価には、表４に示す組成（質量％）を有する板厚２０ｍｍ、幅１５０ｍｍ、長さ３００ｍｍの鋼板を母材として使用した。この母材を開先角度４５°、ルートギャップ１２ｍｍで向かい合わせて配置し、母材の裏側に母材と同様のＳＭ４９０Ａ製の裏当て金を配置した。この開先に対しＣＯ２をシールドガスとして２５Ｌ／分の流量で供給しながら表３−１乃至表３−６に示す組成を有する実施例及び比較例のワイヤを用いてガスシールドアーク溶接を行った。なお、溶接電流は２８０Ａ、溶接金属の積層方法は３層４パスとし、溶接入熱は３５ｋＪ／ｃｍとした。そして、この溶接部に対してＪＩＳ Ｚ ３１１１に規定されるシャルピー衝撃試験及び引張試験を夫々２回ずつ行った。シャルピー衝撃試験による吸収エネルギーについては、７０Ｊ以上であるものを良好（○）とし、４７Ｊ以上７０Ｊ未満のものをやや良好（△）とし、４７Ｊ未満のものを不良（×）として判定した。引張試験による引張強度については、５５０ＭＰａ以上６００ＭＰａ以下であるものを良好（○）とし、６００ＭＰａを超え、６２０ＭＰａ以下のものをやや良好（△）とし、６２０ＭＰａを超えるものを不良（×）として判定した。そして、機械的性質として両者を加味し、衝撃値及び引張強度のいずれも○である場合を機械的性質が○であるとし、衝撃値及び引張強度の組み合わせとして、（○、△）及び（△、△）の場合を機械的性質が△であるとし、衝撃値及び引張強度のいずれかが×である場合に、機械的性質が×であるとした。その結果を表３−１乃至表３−６に併せて示す。 For the evaluation of the mechanical properties of the weld metal, a steel plate having a composition (mass%) shown in Table 4 having a thickness of 20 mm, a width of 150 mm, and a length of 300 mm was used as a base material. This base material was placed facing each other with a groove angle of 45 ° and a root gap of 12 mm, and a backing metal made of SM490A similar to the base material was placed on the back side of the base material. Gas shield arc welding was performed using the wires of Examples and Comparative Examples having the compositions shown in Tables 3-1 to 3-6 while supplying CO 2 as a shielding gas to the groove at a flow rate of 25 L / min. It was. The welding current was 280 A, the welding metal lamination method was 3 layers and 4 passes, and the welding heat input was 35 kJ / cm. And the Charpy impact test and tension test prescribed | regulated to JISZ3111 were each performed twice each to this welded part. Regarding the absorbed energy by the Charpy impact test, a value of 70 J or more was determined as good (◯), a value of 47 J or more and less than 70 J was determined as slightly good (Δ), and a value of less than 47 J was determined as defective (×). About the tensile strength by a tensile test, the thing which is 550 MPa or more and 600 MPa or less was made favorable ((circle)), the thing over 600 MPa, the thing below 620 MPa was made somewhat good ((triangle | delta)), and the thing over 620 MPa was judged as bad (x). . Then, both are considered as mechanical properties. When both the impact value and the tensile strength are ◯, the mechanical property is ◯. As a combination of the impact value and the tensile strength, (◯, △) and (△ , Δ), the mechanical property is Δ, and when either the impact value or the tensile strength is X, the mechanical property is X. The results are also shown in Tables 3-1 to 3-6.

表３−１及び表３−２は本発明の範囲を満足する実施例、表３−３乃至表３−６は本発明の範囲から外れる比較例である。表３−１及び表３−２に示すように、実施例１乃至１０は本発明の範囲を満足し、高溶接電流を使用した立向上進溶接における優れた耐ビード垂れ性及びスパッタ発生抑制性が得られ、更に、優れた溶接金属の機械的性質が得られた。   Tables 3-1 and 3-2 are examples that satisfy the scope of the present invention, and Tables 3-3 to 3-6 are comparative examples that are out of the scope of the present invention. As shown in Table 3-1 and Table 3-2, Examples 1 to 10 satisfy the scope of the present invention, and are excellent in bead sagging resistance and spatter generation suppression in stand-up advance welding using a high welding current. In addition, excellent mechanical properties of the weld metal were obtained.

比較例１はＴｉＯ２の含有量が本発明の範囲を下回り、更にＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和に対するＴｉＯ２及びＡｌ２Ｏ３含有量の和の比が本発明の範囲を下回っているため、立向上進溶接におけるビードの垂れ抑制性が得られなかった。比較例２はＴｉＯ２の含有量並びにＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和が本発明の範囲を超え、スラグ量過多による溶融金属の垂れ及びスパッタ発生量の増加が確認された。 In Comparative Example 1, the content of TiO 2 is lower than the range of the present invention, and the ratio of the sum of TiO 2 and Al 2 O 3 content to the total content of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 However, since it is below the range of the present invention, it was not possible to obtain a bead sag-suppressing property in vertical improvement welding. Comparative Example 2 The content of TiO2 and TiO 2, Al 2 O 3, SiO 2, and the sum of the content of ZrO 2 exceeds the range of the present invention, an increase of sag and spatter of molten metal by slag Excessive amount confirmed.

比較例３はＡｌ２Ｏ３の含有量が本発明の範囲を下回り、スラグの粘性不足のためにビードの垂れ抑制性が得られなかった。比較例４はＡｌ２Ｏ３の含有量が本発明の範囲を超え、大粒のスパッタが多く発生した。比較例５はＳｉＯ２含有量が本発明の範囲を下回り、スラグ形成剤過小によって溶融金属の垂れが確認された。一方、比較例６はＳｉＯ２含有量が本発明の範囲を超え、スラグの粘性低下によって溶融金属の垂れが発生した。比較例７はＺｒＯ２含有量が本発明の範囲を下回り、スラグの所望の凝固点上昇が得られずに溶融金属の垂れが確認された。比較例８はＺｒＯ２含有量が本発明の範囲を超え、スパッタの発生量が増加し、スラグの粘性低下によって溶融金属の垂れが発生した。 In Comparative Example 3, the content of Al 2 O 3 was below the range of the present invention, and bead sag suppression was not obtained due to insufficient viscosity of the slag. In Comparative Example 4, the content of Al 2 O 3 exceeded the range of the present invention, and many large spatters were generated. In Comparative Example 5, the content of SiO 2 was below the range of the present invention, and the dripping of the molten metal was confirmed due to the slag forming agent being too small. On the other hand, in Comparative Example 6, the content of SiO 2 exceeded the range of the present invention, and dripping of the molten metal occurred due to a decrease in slag viscosity. In Comparative Example 7, the ZrO 2 content was below the range of the present invention, and the desired freezing point increase of the slag was not obtained, and the dripping of the molten metal was confirmed. In Comparative Example 8, the ZrO 2 content exceeded the range of the present invention, the amount of spatter generated increased, and dripping of molten metal occurred due to a decrease in slag viscosity.

比較例９はＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和が本発明の範囲を下回り、スラグ形成剤不足によって溶融金属の垂れが確認された。一方、比較例１０はＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和が本発明の範囲を超え、スラグ生成剤過多によって溶融金属の垂れが確認され、スパッタも多量に発生した。 In Comparative Example 9, the total content of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 was below the range of the present invention, and the dripping of the molten metal was confirmed due to the lack of the slag forming agent. On the other hand, in Comparative Example 10, the total content of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 exceeded the range of the present invention, and the dripping of molten metal was confirmed due to excessive slag generating agent, and a large amount of spatter was also generated. did.

比較例１１並びに１２は本発明の範囲を満足する実施例に対し、ＳｉＯ２の含有量を調整してＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和に対するＴｉＯ２及びＡｌ２Ｏ３含有量の和の比を変化させた比較例である。比較例１１はＳｉＯ２の含有量が本発明の範囲を超え、更にＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和に対するＴｉＯ２及びＡｌ２Ｏ３含有量の和の比が本発明の範囲を下回り、スラグの粘性不足によって立向上進溶接における溶融金属の垂れが発生した。一方、比較例１２はＳｉＯ２の含有量が本発明の範囲を下回り、更にＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和に対するＴｉＯ２及びＡｌ２Ｏ３含有量の和の比が本発明の範囲を超えるため、大粒のスパッタが多く発生した。 Comparative Examples 11 and 12 are examples in which the range of the present invention is satisfied, and the content of SiO 2 is adjusted to adjust the content of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 to the total content of TiO 2 and Al. 2 O 3 is a comparative example of changing the ratio of the sum of the contents. In Comparative Example 11, the content of SiO 2 exceeds the range of the present invention, and the ratio of the sum of the content of TiO 2 and Al 2 O 3 to the total content of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 However, it was below the scope of the present invention, and the dripping of molten metal occurred in the vertical improvement welding due to insufficient viscosity of the slag. On the other hand, Comparative Example 12 is below the range the content of SiO 2 is of the present invention, further the sum of TiO 2, Al 2 O 3, SiO 2, and TiO 2 and Al 2 O 3 content to the sum of the content of ZrO 2 This ratio exceeded the range of the present invention, and many large spatters were generated.

比較例１３はＭｎの含有量並びにＳｉ含有量に対するＭｎ及びＭｇ含有量の積の比が本発明の範囲を下回り、脱酸不足によって溶融金属の靱性が低下し、溶融金属の粘性低下によって立向上進溶接における溶融金属の垂れが確認された。一方、比較例１４はＭｎの含有量が本発明の範囲を超え、溶接金属の過度の粘性上昇によって引張強度が過剰となった。   In Comparative Example 13, the ratio of the Mn content and the product of the Mn and Mg contents to the Si content is below the range of the present invention, the toughness of the molten metal is reduced due to insufficient deoxidation, and the rise in the viscosity of the molten metal is improved. The dripping of the molten metal was confirmed in the progressive welding. On the other hand, in Comparative Example 14, the Mn content exceeded the range of the present invention, and the tensile strength became excessive due to an excessive increase in the viscosity of the weld metal.

比較例１５はＳｉ含有量が本発明の範囲を下回り、脱酸不足によって溶接金属の靱性が低下すると共に、立向上進溶接における溶融金属の垂れの発生が確認された。一方、比較例１６はＳｉの含有量が本発明の範囲を超え、粘性が乏しいＳｉＯ２がスラグ中に過剰に生成し、溶融金属の垂れが発生した。比較例１７は、Ａｌの含有量が本発明の範囲を下回り、スラグ及び溶融金属の粘性の低下によって溶融金属の垂れが発生した。比較例１８はＡｌの含有量が本発明の範囲を超え、合金成分が過度に溶接部に析出して溶接金属の引張強度が過剰となり、溶接金属の靭性が低下した。比較例１９は、Ｍｇの含有量が本発明の範囲を下回り、脱酸不足によって溶融金属の粘性が不足して溶融金属の垂れが発生し、更に溶接金属の靱性が低下した。一方、比較例２０はＭｇの含有量が本発明の範囲を超え、大粒のスパッタが多く発生し、更に合金成分が過度に溶接部に析出して溶接金属の引張強度が過剰となった。 In Comparative Example 15, the Si content was below the range of the present invention, and the toughness of the weld metal was lowered due to insufficient deoxidation, and the occurrence of dripping of molten metal in the vertical improvement welding was confirmed. On the other hand, in Comparative Example 16, the Si content exceeded the range of the present invention, and SiO 2 having poor viscosity was excessively generated in the slag, and dripping of the molten metal occurred. In Comparative Example 17, the Al content was below the range of the present invention, and the dripping of the molten metal occurred due to the decrease in the viscosity of the slag and the molten metal. In Comparative Example 18, the Al content exceeded the range of the present invention, the alloy components were excessively deposited on the welded portion, the weld metal had excessive tensile strength, and the weld metal toughness decreased. In Comparative Example 19, the Mg content was lower than the range of the present invention, and the molten metal was insufficient due to insufficient deoxidation, resulting in dripping of the molten metal, and the toughness of the weld metal further decreased. On the other hand, in Comparative Example 20, the Mg content exceeded the range of the present invention, a large amount of spatter was generated, and the alloy components were excessively deposited on the welded portion, resulting in excessive tensile strength of the weld metal.

比較例２１はＳｉの含有量に対するＭｎ及びＭｇ含有量の積の比が本発明の範囲を下回り、脱酸不足によって溶融金属の粘性が低下し、立向上進溶接における溶融金属の垂れが確認され、更に、溶接金属の引張強度及び靱性が低下した。一方、比較例２２はＳｉ含有量に対するＭｎ及びＭｇ含有量の積の比が本発明の範囲を超え、脱酸過剰によって溶接金属の引張強度が過度に高くなり、更に、靱性が低下した。   In Comparative Example 21, the ratio of the product of Mn and Mg content to the Si content is below the range of the present invention, and the viscosity of the molten metal is reduced due to insufficient deoxidation, and it is confirmed that the molten metal sags in the vertical improvement welding. Furthermore, the tensile strength and toughness of the weld metal decreased. On the other hand, in Comparative Example 22, the ratio of the product of Mn and Mg content to the Si content exceeded the range of the present invention, and the tensile strength of the weld metal was excessively increased due to excessive deoxidation, and the toughness was further decreased.

比較例２３はＮａ及びＫ含有量の和が本発明の範囲を下回り、アークが不安定となって大粒のスパッタの発生量が増加し、更に、溶融池の振動が大きくなり、スラグ及び溶融金属の垂れが発生した。比較例２４はＮａ及びＫ含有量の和が本発明の範囲を超え、粘性に乏しいＮａ２Ｏ及びＫ２Ｏが過剰に生成して立向上進溶接における溶融金属の垂れが発生した。比較例２５はＫ含有量に対するＮａ含有量の比が本発明の範囲を下回り、アークの吹きつけ力が強くなってスラグ及び溶融金属の垂れが発生した。一方、比較例２６はＫ含有量に対するＮａ含有量の比が本発明の範囲を超え、アークの集中性が増加してスパッタの発生量が増加した。 In Comparative Example 23, the sum of the Na and K contents falls below the range of the present invention, the arc becomes unstable, the amount of large spatter generated increases, the vibration of the molten pool increases, slag and molten metal Sagging occurred. In Comparative Example 24, the sum of the Na and K contents exceeded the range of the present invention, and Na 2 O and K 2 O having poor viscosity were excessively generated, and dripping of molten metal occurred in the vertical improvement welding. In Comparative Example 25, the ratio of the Na content to the K content was below the range of the present invention, the arc blowing force was increased, and slag and molten metal sagging occurred. On the other hand, in Comparative Example 26, the ratio of the Na content to the K content exceeded the range of the present invention, the arc concentration increased, and the amount of spatter generated increased.

本発明の範囲を満足する実施例１乃至１２のうち、実施例１乃至１０は本発明の請求項２を満足する実施例である。実施例１乃至１０はＴｉ、Ｚｒ、Ｃｕ、Ｃｒ、Ｎｂ及びＶの内１種以上の含有量の合計が本発明の範囲を満足し、実施例１１は本願請求項１は満たすが請求項２は満足しないものであり、実施例１２は本願請求項２の成分を含有しないものである。これらの実施例１２及び１３は、実施例１乃至１０よりは特性が全体で劣るものの、比較例１乃至２６よりは、全体で特性が優れている。   Among Examples 1 to 12 that satisfy the scope of the present invention, Examples 1 to 10 are examples that satisfy claim 2 of the present invention. In Examples 1 to 10, the total content of at least one of Ti, Zr, Cu, Cr, Nb, and V satisfies the scope of the present invention, and Example 11 satisfies Claim 1 of the present application, but Claim 2 Is not satisfied, and Example 12 does not contain the component of Claim 2 of the present application. Although these Examples 12 and 13 are generally inferior in characteristics to Examples 1 to 10, they are generally superior in characteristics to Comparative Examples 1 to 26.

フラックス入りワイヤの断面を示す図である。It is a figure which shows the cross section of a flux cored wire.

符号の説明Explanation of symbols

１：フラックス入りワイヤ、１ａ：外皮、１ｂ：フラックス 1: flux-cored wire, 1a: outer skin, 1b: flux

Claims (2)

軟鋼、高張力鋼又は低合金鋼製の金属外皮にフラックスを充填したチタニヤ系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、ワイヤ全質量あたり、ＴｉＯ２：６．０乃至１２．０質量％、Ａｌ２Ｏ３：０．７乃至１．０質量％、ＳｉＯ２：０．６乃至１．０質量％、ＺｒＯ２：０．１乃至０．３質量％、を含有し、更に、金属又は合金としてＭｎ：１．０乃至３．０質量％（合金の場合はＭｎ換算値）、Ｓｉ：０．３乃至０．６質量％（合金の場合はＳｉ換算値）、Ａｌ：０．１乃至０．３質量％（合金の場合はＡｌ換算値）、及びＭｇ：０．６乃至０．９質量％（合金の場合はＭｇ換算値）を含有し、
ＴｉＯ２含有量を［ＴｉＯ２］、Ａｌ２Ｏ３含有量を［Ａｌ２Ｏ３］、ＳｉＯ２含有量を［ＳｉＯ２］、ＺｒＯ２含有量を［ＺｒＯ２］、金属又は合金としてのＭｎ含有量（合金の場合はＭｎ換算値）を［Ｍｎ］、金属又は合金としてのＳｉ含有量（合金の場合はＳｉ換算値）を［Ｓｉ］、金属又は合金としてのＭｇ含有量（合金の場合はＭｇ換算値）を［Ｍｇ］、Ｎａ含有量（化合物又は合金の場合はＮａ換算値）を［Ｎａ］、Ｋ含有量（化合物又は合金の場合はＫ換算値）［Ｋ］とするとき、
ＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和［ＴｉＯ２］＋［Ａｌ２Ｏ３］＋［ＳｉＯ２］＋［ＺｒＯ２］が８．０乃至１３．５質量％、ＴｉＯ２、Ａｌ２Ｏ３、ＳｉＯ２、及びＺｒＯ２含有量の総和に対するＴｉＯ２及びＡｌ２Ｏ３含有量の和の比（［ＴｉＯ２］＋［Ａｌ２Ｏ３］）／（［ＴｉＯ２］＋［Ａｌ２Ｏ３］＋［ＳｉＯ２］＋［ＺｒＯ２］）が０．８５乃至０．９５、Ｓｉ含有量に対するＭｎ及びＭｇ含有量の積の比［Ｍｎ］×［Ｍｇ］／［Ｓｉ］が２．０乃至４．０、Ｎａ及びＫ含有量の和［Ｎａ］＋［Ｋ］が０．１５乃至０．２５質量％、Ｋ含有量に対するＮａ含有量の比［Ｎａ］／［Ｋ］が０．２０乃至０．４０であることを特徴とするチタニヤ系ガスシールドアーク溶接用フラックス入りワイヤ。 In a flux-cored wire for titania-based gas shielded arc welding in which a metal sheath made of mild steel, high-strength steel or low-alloy steel is filled with flux, TiO 2 : 6.0 to 12.0% by mass, Al 2 per total mass of the wire O 3 : 0.7 to 1.0% by mass, SiO 2 : 0.6 to 1.0% by mass, ZrO 2 : 0.1 to 0.3% by mass, and Mn as a metal or alloy : 1.0 to 3.0% by mass (Mn equivalent value in case of alloy), Si: 0.3 to 0.6% by mass (Si equivalent value in case of alloy), Al: 0.1 to 0.3% Containing mass% (Al equivalent value in case of alloy) and Mg: 0.6 to 0.9 mass% (Mg equivalent value in case of alloy),
TiO 2 content [TiO 2 ], Al 2 O 3 content [Al 2 O 3 ], SiO 2 content [SiO 2 ], ZrO 2 content [ZrO 2 ], Mn as metal or alloy The content (Mn equivalent value in case of alloy) is [Mn], Si content as metal or alloy (Si equivalent value in case of alloy) is [Si], Mg content as metal or alloy (in case of alloy) Is Mg conversion value [Mg], Na content (Na conversion value in the case of a compound or alloy) is [Na], K content (K conversion value in the case of a compound or alloy) [K],
The total [TiO 2 ] + [Al 2 O 3 ] + [SiO 2 ] + [ZrO 2 ] of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 content is 8.0 to 13.5 mass%, Ratio of the sum of TiO 2 and Al 2 O 3 content to the sum of TiO 2 , Al 2 O 3 , SiO 2 , and ZrO 2 content ([TiO 2 ] + [Al 2 O 3 ]) / ([TiO 2 ] + [Al 2 O 3 ] + [SiO 2 ] + [ZrO 2 ]) is 0.85 to 0.95, and the ratio of the product of Mn and Mg content to Si content [Mn] × [Mg] / [ Si] is 2.0 to 4.0, the sum of Na and K contents [Na] + [K] is 0.15 to 0.25 mass%, and the ratio of Na content to K content [Na] / [ K] is 0.20 to 0.40, and a titania-based gas shielded arc is characterized by Contact for flux-cored wire. ワイヤ全質量あたり、Ｔｉ、Ｚｒ、Ｃｕ、Ｃｒ、Ｎｂ及びＶのうち、１種以上を総計で０．５質量％以下含有することを特徴とする請求項１に記載のチタニヤ系ガスシールドアーク溶接用フラックス入りワイヤ。 2. The titania-based gas shielded arc welding according to claim 1, wherein the total amount of Ti, Zr, Cu, Cr, Nb and V is 0.5% by mass or less per total mass of the wire. Flux cored wire.
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