WO2020255808A1 - フラックス入りワイヤ及び溶接方法 - Google Patents
フラックス入りワイヤ及び溶接方法 Download PDFInfo
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- WO2020255808A1 WO2020255808A1 PCT/JP2020/022756 JP2020022756W WO2020255808A1 WO 2020255808 A1 WO2020255808 A1 WO 2020255808A1 JP 2020022756 W JP2020022756 W JP 2020022756W WO 2020255808 A1 WO2020255808 A1 WO 2020255808A1
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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
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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
- B23K35/02—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
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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
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
-
- 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
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
-
- 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
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
-
- 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
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
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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
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
-
- 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
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Definitions
- the present invention relates to a flux-cored wire, and particularly to a flux-cored wire suitable for welding in an upward posture or an upright posture. It also relates to a gas shielded arc welding method using the flux-cored wire.
- the flux-cored wire has versatility that can be applied to all postures including downward welding, vertical welding, horizontal welding, and upward welding.
- vertical welding and upward welding are particularly difficult to weld because the bead appearance is more likely to be poor or melted down due to the influence of gravity. Therefore, there is a problem that it is difficult to obtain good melt resistance and bead appearance in all postures.
- Patent Document 1 contains Al, Mg and BaF 2 as essential flux components in specific amounts, and the flux for gas shielded arc welding in which the flux filling rate and the contents of Mn and Si with respect to the total wire mass are optimized.
- the incoming wire is disclosed.
- arc welding is performed on this flux-containing wire with DC positive electrode properties in a welding current range of a low current to a medium current of about 50 to 300 A, the amount of spatter generated in all-position welding is small.
- a weld metal having good weldability and good toughness can be obtained.
- the applicable welding current range of the flux-cored wire of Patent Document 1 is in the range of low current to medium current.
- the examples are limited to the welding current of 200 A.
- the welding current for performing full-posture welding is preferably 210 to 290 A in vertical downward welding and downward / horizontal fillet welding.
- the welding current in the vertical improvement / upward welding is preferably 110 to 140 A.
- the arc voltage is preferably 23 to 29V for vertical downward welding and downward / horizontal fillet welding, but is preferably 14 to 18V for vertical improvement / upward welding. is there.
- the present invention suppresses welding defects mainly due to melt-off while ensuring high efficiency in a welding current range of a relatively high current in upward posture or vertical posture welding, particularly under the condition of a welding current exceeding 200 A. It is an object of the present invention to provide a flux-cored wire having a good bead appearance. Another object of the present invention is to provide a highly efficient welding method using the flux-cored wire.
- a flux-containing wire containing a flux as a core and a hoop as an outer skin, wherein the flux contains a strongly deoxidized metal element (flux) containing Mg and Al and a fluorine compound powder (flux) .
- the total content of the strongly deoxidized metal element (flux) is 15 to 35% by mass with respect to the total mass of the flux, and Mg and Al of the strongly deoxidized metal element (flux) are at least one.
- the portion is contained as a strongly deoxidized metal powder (flux) which is at least one of a metal powder and an alloy powder, and the strongly deoxidized metal powder (flux) has a particle size of 60% by mass or more and 150 ⁇ m or less.
- the total content of the fluorine compound powder (flux) is 10 to 45 mass% with respect to the flux to the total mass
- the fluorine compound powder (flux) is more than 60 wt% is a particle size of less than 75 [mu] m
- the The flux-containing wire contains the flux in an amount of 10 to 30% by mass based on the total weight of the wire
- the flux-containing wire contains C (ware) : 0.5% by mass or less based on the total weight of the wire , Si (wire).
- the flux-containing wire has Ni (wire) : 15% by mass or less, Mo (ware) : 5.0% by mass or less, W (ware) : 3.0% by mass or less, Nb with respect to the total wire mass.
- the water content (WC) with respect to the total mass of the wire is 0.010 to 0.100% by mass, and the total content of the water content (WC) and the strongly deoxidized metal element (wire) is The flux-containing wire according to any one of [1] to [4] above, which satisfies the relationship of 105 ⁇ (total content of strongly deoxidized metal element (wire) / WC) ⁇ 170.
- welding can be performed in all postures even in a relatively high welding current range.
- welding current exceeds 200 A, welding defects mainly due to melt-through are suppressed, and high-efficiency welding is possible while maintaining a good bead appearance.
- the flux-cored wire (hereinafter, may be simply referred to as “wire”) according to the present embodiment includes a flux as a core and a hoop as an exodermis.
- the flux contains a strongly deoxidized metal element (flux) containing Mg and Al and a fluorine compound powder (flux), and the total content of the strongly deoxidized metal element (flux) is 15 with respect to the total mass of the flux. It is ⁇ 35% by mass.
- At least one of the metal powder and the alloy powder of one or more kinds related to the strongly deoxidized metal element (flux) is contained as the strongly deoxidized metal powder (flux), and the strongly deoxidized metal powder (flux) is 60.
- the particle size of 100% by mass or more is 150 ⁇ m or less.
- the total content of the fluorine compound powder (flux) is 10 to 45% by weight of the flux to the total mass, the fluorine compound powder (flux) is more than 60% by weight or less of particle size 75 [mu] m.
- the flux-cored wire contains 10 to 30% by mass of flux with respect to the total mass of the wire. That is, the flux ratio is 10 to 30% by mass.
- the flux-containing wire has C (ware) : 0.5% by mass or less, Si (ware) : 0.05 to 1.0% by mass, and Al (wire) : 1.0 to 3% with respect to the total weight of the wire.
- the flux serving as the core of the flux-cored wire contains a strongly deoxidized metal element (flux) and a fluorine compound powder (flux) .
- the strongly deoxidized metal element contains two or more kinds of Mg and Al as essential, and other strongly deoxidized metal elements include Ti, Zr, Ca, rare earth elements (hereinafter, may be referred to as "REM") and the like. Is optionally contained, and as any strongly deoxidized metal element, it is preferable to further contain at least one element selected from the group consisting of Ti, Zr and Ca.
- the flux contains Ni; deoxidizing elements such as Si and Mn; oxides such as SiO 2 , TiO 2 , and FeO; nitrides and the like, if necessary. It may be added, and the balance becomes iron powder and impurities.
- Mg which is a strongly deoxidized metal element, is an element that can obtain a sufficient deoxidizing effect and realize good toughness. Moreover, since the oxide of Mg has a high melting point, the rate of formation of slag formed on the surface of the molten pool is improved. The higher the current, the higher the temperature of the molten pool and the lower the viscosity and surface tension of the molten pool. Therefore, in upward welding and vertical welding, the higher the current is, the more likely it is that melt-off and bead appearance defects occur. However, by adding an appropriate amount of Mg, even when the welding current exceeds 200 A, slag can be formed early on the surface of the molten pool before the shape of the molten pool changes due to gravity.
- Mg has a high vapor pressure and contributes to welding workability by stabilizing the arc with metal steam.
- it has a high stabilizing effect in the explosion transfer, which is a form of droplet transfer.
- the explosive transition is a transition mode in which the gas component in the droplet formed at the tip of the wire explodes and migrates to the base metal.
- Mg is contained in the flux, but a part thereof may be contained in the exodermis (hereinafter, may be simply referred to as "hoop").
- metal powder Mg, Mg-Al, an alloy powder such as Fe-Mg, fluoride MgF 2 or the like as an example.
- the metal powder of Mg may be referred to as Mg powder
- the alloy powder of Mg—Al may be referred to as Mg—Al powder and the like.
- the content of Mg (wire) is 0.3 to 0.9% by mass, preferably 0.55% by mass or more, and preferably 0.85% by mass or less with respect to the total mass of the wire.
- the content of Mg (flux) contained in the flux is preferably 1.5% by mass or more, and preferably 8.0% by mass or less, based on the total mass of the flux.
- Al is an element essential to the flux as a strongly deoxidized metal element, but a part of it may be contained in the exodermis (hoop).
- metal powder Al Mg-Al
- fluorides such AlF 3
- the Al (wire) content is 1.0% by mass or more with respect to the total mass of the wire.
- the upper limit of the content is 3.5% by mass or less, it is possible to prevent an excessive explosion transition, so that the arc is stable.
- the content of Al (wire) is 1.0 to 3.5% by mass, preferably 1.8% by mass or more, and preferably 3.1% by mass or less, based on the total mass of the wire.
- the content of Al (flux) contained in the flux is preferably 10.0% by mass or more, and preferably 25.0% by mass or less, based on the total mass of the flux.
- Mg and Al are strongly deoxidized metal elements essential for flux in the present invention from the viewpoint of slag formation rate and arc stability. Further, at least one of these elements needs to be contained together in the flux as a strongly deoxidized metal powder (flux) in the form of a metal powder or an alloy powder. That is, the strongly deoxidized metal powder (flux) is combined with oxygen in the welding process to obtain the toughness improving effect by deoxidizing and the droplet transfer stabilizing effect by metal vapor, but even if it is contained in the oxide state. , Such an effect cannot be obtained.
- the flux is not completely melted at the time of welding, and the undissolved oxide flows toward the edge due to the convection of the molten pool, so that uniform slag formation cannot be expected over the entire surface of the molten pool.
- the oxide state refers to, for example, Al 2 O 3 , Mg O, and the like.
- the strongly deoxidized metal powder contains Mg and Al as a metal powder composed of a single metal powder or a composite metal, that is, an alloy powder. Specifically, it includes Al powder or Mg powder which is a single metal powder of Al or Mg, and metal powder made of a composite metal containing at least one of Al and Mg, that is, an alloy powder. Examples of the metal powder made of the composite metal include Fe-Al powder, Ni-Al-Si powder, Fe-Mg powder, Mg-Al powder and the like.
- the strongly deoxidized metal powder (flux) may be composed of one kind of metal powder or may be composed of a plurality of metal powders.
- Mg (flux) and Al (flux) added to the flux have a property of combining with oxygen in the weld metal and slagging out. Since Mg is a very strong deoxidizing metal element, almost all of it slags out with almost no residue in the weld metal. On the other hand, Al does not have as much deoxidizing power as Mg, about 60% slags out, and about 40% remains in the weld metal.
- the slag which is an oxide containing Al and Mg, has a spinel structure containing MgAl 2 O 4 and FeAl 2 O 4, and is a very stable oxide having a high melting point. The solidification rate of the slag is faster than, for example, the solidification rate of a normal titanium slag system, and is particularly excellent in melt-down resistance during upward welding and vertical welding.
- the amount of metal added to Mg (wire) and Al (wire) that is, the content of Mg and Al with respect to the total mass of the wire is 0.35 ⁇ (2 ⁇ Mg (wire) /0.6 ⁇ Al (wire) ) ⁇ 1. It is preferable to satisfy the relationship of .50.
- By setting the ratio of the metal addition amount to 0.35 or more it is possible to prevent an increase in the Al yield amount in the weld metal.
- the ratio value represented by (2 ⁇ Mg (wire) /0.6 ⁇ Al (wire) ) is more preferably 0.80 or more, and further 0.85 or more. It is preferable, 1.30 or less is more preferable, 1.20 or less is further preferable, and 1.15 or less is further preferable.
- the strongly deoxidized metal powder has a particle size of 150 ⁇ m or less. If the amount of strongly deoxidized metal powder (flux) having a particle size of 150 ⁇ m or less is less than 60% by mass, the flux is not completely melted during welding, the slag formation speed is slowed down, and good melt resistance and bead appearance shape may not be obtained. There is sex. In addition, since the undissolved metal powder flows toward the edge due to the convection of the molten pool, uniform slag formation cannot be expected over the entire surface of the molten pool.
- the particle size of 150 ⁇ m or less preferably occupies 70% by mass or more, and more preferably 80% by mass or more. Further, it is more preferable that the particle size is 60% by mass or more and 100 ⁇ m or less.
- the particle size of the strongly deoxidized metal powder or the fluorine compound powder can be measured by using a sieve having an appropriate opening size based on JIS Z 8801-1: 2006.
- the total content of the strongly deoxidized metal element (flux) contained in the flux is 15 to 35% by mass with respect to the total mass of the flux. By setting the total content of the strongly deoxidized metal element (flux) to 15% by mass or more, slag formation is sufficient and good leaching resistance can be obtained. Further, when the total content is 35% by mass or less, a good bead appearance can be obtained.
- the total content of the strongly deoxidized metal element (flux) is preferably 18% by mass or more, and preferably 32% by mass or less, based on the total mass of the flux.
- the total content of the strongly deoxidized metal element (wire) contained in the wire is 2.2% by mass or more, preferably 2.5% by mass or more, based on the total mass of the wire.
- the content of the strongly deoxidized metal element (wire) is 2.2% by mass or more, the molten pool can be suitably suppressed by slag, and melting of upward welding and vertical welding at a welding current of 200 A or more. Suppress the fall.
- the content of the strongly deoxidized metal element (wire) is 4.0% by mass or less, excessive formation of slag can be suppressed and a better bead appearance can be realized, which is preferable.
- the total content including these elements is the strongly deoxidized metal element (wire).
- the total content of the strongly deoxidized metal element (flux) is used.
- the total content of the fluorine compound powder (flux) is 10 to 45% by mass with respect to the total mass of the flux. When the total content is 10% by mass or more, the detached droplets can be made finer. Further, when the total content is 45% by mass or less, droplets are satisfactorily formed.
- the total content of the fluorine compound powder (flux) is preferably 10.5% by mass or more, and preferably 41% by mass or less.
- the total content of the fluorine conversion value F of the fluorine compound powder (wire) contained in the flux-cored wire is 0.30 to 1.20% by mass with respect to the total mass of the wire.
- the total content of the fluorine compound powder (wire) is 0.30% by mass or more, the droplet transfer is achieved by making the detached droplets finer. Further, when the total content is 1.20% by mass or less, droplets are satisfactorily formed without excessive volatilization inside the wire.
- the total content of the fluorine conversion value F of the fluorine compound powder (wire) is preferably 0.40% by mass or more, and preferably 0.90% by mass or less.
- the fluorine compound powder has a particle size of 75 ⁇ m or less.
- the particle size of the fluorine compound powder preferably occupies 70% by mass or more, and more preferably 75% by mass or more.
- the fluorine compound powder examples include BaF 2 , SrF 2 , Na 3 AlF 6 , NaF, CaF 2, AlF 3 , MgF 2, and the like, and these may be contained alone or in combination of two or more.
- the fluorine compound powder (flux) is at least one compound powder selected from the group consisting of BaF 2 , SrF 2 , Na 3 AlF 6, AlF 3 , MgF 2 , NaF and CaF 2 for welding workability. From this point of view, at least one compound powder selected from the group consisting of BaF 2 , SrF 2 , Na 3 AlF 6 , NaF, MgF 2 and CaF 2 is more preferable.
- Ba has a low work function, has an effect of further stabilizing the cathode point, and contributes to improvement of welding workability, it is more preferable to contain BaF 2 , which is a fluoride related to Ba.
- the content of BaF 2 (wire) with respect to the total mass of the wire is preferably 1.0% by mass or more, more preferably 1.2% by mass or more from the viewpoint of welding workability. Further, from the viewpoint of reducing sputtering, the content of BaF 2 (wire) is preferably 6% by mass or less, and more preferably 5.5% by mass or less.
- the flux-cored wire according to the present embodiment contains water, it is preferable because an explosive effect due to volume expansion at the time of steaming can be obtained when a sudden amount of heat is applied in the vicinity of the arc. As a result, the formed droplets are atomized, the enlargement of the droplets is suppressed, and spatter can be reduced. Further, oxygen in the water (H 2 O) Mn, Al, by causing metal and the oxidation reaction, such as Mg, slag is an oxide is formed on the molten Ikegami. This makes it possible to improve the melt-down resistance in all-posture welding such as vertical welding and upward welding.
- the water content (WC) with respect to the total weight of the wire is preferably 0.010% by mass or more, and preferably 0.100% by mass or less.
- the water content (WC) is more preferably 0.015% by mass (150% by mass) or more, and more preferably 0.050% by mass (500% by mass) or less.
- the amount of water in the wire can be determined by the Karl Fischer method using dry air as the carrier gas.
- the relationship between the water content (WC, mass%) and the total content (mass%) of the strongly deoxidized metal element (ware) with respect to the total weight of the wire is 105 ⁇ (strong deoxidized metal element (wire). ) Satisfying the total content / WC) ⁇ 170 is preferable from the viewpoint of leaching resistance.
- the ratio (WC / F) of the total (mass%) of the fluorine conversion value F of the WC (mass%) and the fluorine compound (wire) is preferably 0.025 or more, more preferably 0.030 or more. Further, in consideration of welding workability, 0.100 or less is preferable, and 0.090 or less is more preferable.
- the flux in the present embodiment is 10 to 30% by mass, that is, the flux ratio is 10 to 30% by mass with respect to the total mass of the wire.
- the flux ratio is more preferably 11% by mass or more, and more preferably 20% by mass or less.
- C (ware) 0.5% by mass or less
- Mn (ware) 1.0 to 3.0% by mass
- Si with respect to the total mass of the wire.
- Wire Contains 0.05 to 1.0% by mass.
- C (wire) 0.5% by mass or less (including 0% by mass)> Since C is arbitrarily added to adjust the strength of the weld metal, the lower limit is not specified. On the other hand, by setting C (wire) to 0.5% by mass or less with respect to the total mass of the wire, it is possible to prevent the strength of the weld metal from becoming too high and the toughness from decreasing.
- the content of C (wire) is preferably 0.2% by mass or less.
- Mn is an element effective for deoxidizing effect and solid solution strengthening, and can improve mechanical performance such as tensile strength and toughness.
- the content of Mn (wire) is 1.0 to 3.0% by mass with respect to the total mass of the wire. By containing 1.0% by mass or more, the effect of solid solution strengthening can be sufficiently obtained, and good mechanical performance can be obtained. Further, by setting the content to 3.0% by mass or less, excessive improvement in strength can be suppressed, and appropriate toughness can be ensured.
- the Mn content is preferably 1.5% by mass or more, preferably 2.5% by mass or less, and more preferably 2.0% by mass or less with respect to the total mass of the wire.
- Si is an element that improves the compatibility between the base metal and the weld metal
- the flux contains 0.05% by mass or more with respect to the total mass of the wire.
- the upper limit is set to 1.0% by mass.
- the Si content is preferably 0.1% by mass or more, and preferably 0.80% by mass or less.
- Ni is an element capable of improving toughness and tensile strength at high heat input and high interpass temperature, it may be optionally added if necessary. Excessive addition of Ni reduces the viscosity of the molten pool. If the viscosity of the molten pool decreases in the case of upward welding or vertical welding, there is a risk of welding defects such as melt-down and poor bead appearance due to the influence of gravity.
- Ni (wire) when optionally added, it is preferably 15% by mass or less, more preferably 5% by mass or less, based on the total mass of the wire. Further, in order to obtain the above effect, the Ni content is preferably 0.01% by mass or more, more preferably 0.05% by mass or more.
- Ni In the form of adding Ni, it is preferable to use at least one metal simple substance or compound selected from the group consisting of metal Ni, Cu-Ni, Fe-Ni, and Ni-Mg contained in the flux. By containing it in this form, slag formation becomes dominant, and it becomes possible to better suppress melt-off during upward welding or vertical welding.
- Mo, Nb, V, and Cr are all elements capable of improving toughness or tensile strength, they may be optionally added if necessary for adjusting toughness or tensile strength. Moreover, these elements are elements that form carbides having a high melting point. Examples of high melting point carbides include Mo 2 C, Nb C, VC, and Cr 3 C 2 . Due to their high melting point, these carbides are prematurely formed as slag on the surface of the molten pool. From this characteristic, it is possible to suppress melt-off during upward welding and obtain a good bead appearance.
- Mo, Nb, V, and Cr are Mo (wire) : 5.0% by mass or less, Nb (wire) : 5.0% by mass or less, V (wire) : 5.0% by mass or less, and Cr (wire). ) : It is preferable to include it so as to satisfy any one of 30% by mass or less from the viewpoint of maintaining a good bead appearance, and it is more preferable to include it so as to satisfy all of them.
- the total content of Mo, Nb and V is preferably 5.0% by mass or less, more preferably 3.0% by mass or less, based on the total mass of the wire.
- the form of addition of Mo, Nb, V, and Cr is not particularly limited, and the addition may be in the hoop or in the flux. Further, the total content of Mo, Nb and V is preferably 0.005% by mass or more with respect to the total mass of the wire.
- W is an element effective for improving the strength, it may be optionally added if necessary for adjusting the tensile strength. Since excessive addition of W causes deterioration of toughness due to excessive strength, the content of W is preferably 3.0% by mass or less with respect to the total mass of the wire.
- Ti is a strongly deoxidized metal element and is an element effective for improving toughness due to the deoxidizing effect.
- An appropriate amount may be added to adjust the toughness, but if Ti is added excessively, the inclusions become coarse and the amount of inclusions becomes excessive, so that the toughness decreases. Therefore, the Ti content is preferably suppressed to 3.0% by mass or less with respect to the total mass of the wire.
- Zr is a strongly deoxidized metal element and is an element effective for improving toughness due to the deoxidizing effect.
- An appropriate amount may be added to adjust the toughness, but if Zr is added excessively, the inclusions become coarse and the amount of inclusions becomes excessive, so that the toughness decreases. Therefore, the Zr content is preferably 2.0% by mass or less with respect to the total mass of the wire.
- Ca is added from CaF 2 , CaCO 3, etc., and is a strongly deoxidized metal element like Ti and Zr, and is an element effective for improving toughness due to the deoxidizing effect.
- An appropriate amount may be added to adjust the toughness, but if Ca is added excessively, the inclusions become coarse and the amount of inclusions becomes excessive, so that the toughness decreases. Therefore, the Ca content is preferably 3.0% by mass or less with respect to the total mass of the wire.
- REM rare earth metal
- wire 0.5% by mass or less
- REM rare earth metal
- the total content of REM is preferably 0.5% by mass or less, more preferably 0.2% by mass or less, based on the total mass of the wire.
- the REM La, Ce, and Y are more preferably used.
- the above Ti (wire) Zr (wire) , Ca (wire) , and REM become strongly deoxidized metal elements together with Al and Mg.
- Al and Mg may be contained not only in the flux but also in the exodermis, but it is preferable that they are contained in the flux.
- the content of Mg (wire) , Al (ware) , Zr (wire) , Ti (wire) and Ca (wire) ( mass% of the total weight of the wire) is 5 ⁇ ⁇ (Mg). It is preferable to satisfy the relationship of (wire) + Al (wire) ) / (Zr (wire) + Ti (wire) + Ca (wire) ) ⁇ ⁇ 70.
- Mg (ware) and Al (wire) mean the total amount of Mg and Al contained in the flux and the outer skin, that is, Mg and Al contained in the entire wire, respectively.
- Oxides of these elements have a high melting point and form slag at an early stage on the surface of the molten pool, suppressing leaching and poor bead appearance.
- Mg and Al tend to aggregate slag and form slag over the entire surface of the molten pool.
- Zr, Ti and Ca slag is easily dispersed, slag formation tends to be concentrated toward the edge due to the flow of the molten pool, and a remarkable effect of ensuring slag resistance and good bead appearance does not appear.
- the value represented by the above ratio is 70 or less, it is preferable from the viewpoint of toughness, and sufficient toughness can be secured.
- the ratio is more preferably 25 or more, further preferably 27 or more, still more preferably 60 or less, still more preferably 55 or less.
- O oxygen
- the content of O (wire) is preferably 0.05% by mass or less, more preferably 0.04% by mass or less, based on the total mass of the wire.
- oxygen contained in the wire causes an oxidation reaction with metals such as Al and Mg in the weld metal, so that an oxide (slag) is formed on the molten pool. This makes it possible to improve the melt-down resistance in all-posture welding such as vertical welding and upward welding.
- N is effective in improving strength and combines with Ti, Zr, Nb, Cr and Mn to form a nitride and contributes to toughness.
- the content of N (wire) is preferably 0.05% by mass or less in order to suppress deterioration of toughness due to excessive strength and occurrence of welding defects such as pore defects and cracks.
- S is an element that lowers the surface tension of the molten pool. Moreover, if a large amount is added, the possibility of cracking increases. Therefore, the content of S (wire) is preferably 0.05% by mass or less from the viewpoints of melt resistance, bead appearance shape, and crack resistance.
- P is an impurity element, and the content of P (wire) is preferably suppressed to 0.05% by mass or less from the viewpoint of crack resistance.
- B has the effect of refining the microstructure of the weld metal by adding a small amount and improving the low temperature toughness of the weld metal.
- the content of B (wire) is preferably 0.05% by mass or less with respect to the total mass of the wire.
- B can be added from alloy powders such as metal B, Fe-B, Fe-Mn-B, and Mn-B from flux.
- Cu is an element that contributes to improving the strength of the weld metal.
- the Cu (wire) content is preferably 5.0% by mass or less with respect to the total mass of the wire in order to prevent the weld metal from becoming excessive in strength and decreasing toughness.
- Cu can be added from alloy powders such as metal Cu, Cu—Zr, and Fe—Si—Cu from flux.
- ⁇ Ba (wire) 5.0% by mass or less> Ba is added from BaF 2 , BaCO 3, etc., and has the effect of stabilizing the arc and reducing the amount of spatter generated. However, if Ba is added in excess, arc deflection occurs and welding workability deteriorates. Therefore, the content of Ba (wire) is preferably 5.0% by mass or less, more preferably 3.0% by mass or less, based on the total mass of the wire .
- Total alkali metal elements (wire) : 3.0% by mass or less> Alkali metal elements improve arc stability and contribute to improving welding workability such as spatter reduction. Excessive addition of a compound related to an alkali metal element may deteriorate the hygroscopicity of the wire and cause welding defects such as cracks and pore defects. Therefore, the total content of the alkali metal elements is preferably 3.0% by mass or less with respect to the total mass of the wire.
- the alkali metal element include Na, K, Li and the like, which are added to the flux in the form of oxides, fluorides and the like, or adhered to the hoop surface.
- Fe (wire) 40% by mass or more>
- the content of Fe (wire) is preferably 40% by mass or more, more preferably 60% by mass or more, and further preferably 80% by mass or more.
- the Fe (wire) content is preferably 95% by mass or less, more preferably 94% by mass or less.
- Fe is contained as Fe (Hoop) constituting the exodermis, iron powder added to the flux, and Fe (flux) of the alloy powder.
- the balance of the wire becomes an impurity, and examples thereof include Ta and Be.
- the hoop serving as the outer skin of the flux-cored wire according to the present embodiment is not particularly limited in thickness and width, but for example, the thickness is preferably 0.5 mm or more, and preferably 1.5 mm or less.
- the width is preferably 30 mm or less.
- the width of the hoop By setting the width of the hoop to 30 mm or less, it is possible to suppress the coarsening of droplets and to make the detached droplets finer at the time of explosion transition. Therefore, the occurrence of spatter can be suppressed, which is preferable.
- the lower limit of the width of the hoop is not particularly limited, but 10 mm or more is preferable from the viewpoint of preventing leakage of flux and vaporized fluorine from the seam.
- the metal leaf in the hoop can be either mild steel metal leaf or stainless steel metal leaf depending on the purpose of welding.
- a mild steel-based metal leaf when the characteristics of producing a welded joint of a structure with sufficient penetration are required.
- a SUS (stainless steel) metal foil when performing welding work such as overlay welding in which the penetration is shallow and the dilution of the base metal is suppressed and the amount of welding is desired to be increased.
- C (Hoop) 0.005 to 0.040% by mass or less
- Si (Hoop) 0.005 to 0.050% by mass or less
- Mn with respect to the total mass of the hoop.
- (Hoop) 0.01 to 0.30% by mass or less
- P (Hop) 0.01% by mass or less
- S (Hop) 0.01% by mass or less.
- the relationship between the contents Si (Hoop) and Mn (Hoop) of Si and Mn with respect to the total mass of the hoop, and the contents Si (wire) and Mn (ware) with respect to the total mass of the wire is 0.01 ⁇ ⁇ (Si).
- a metal foil satisfying (Hoop) + Mn (Hoop) ) ⁇ (HR / 100) ⁇ / (Si (wire) + Mn (wire) ) ⁇ ⁇ 0.25 is preferable.
- HR means a hoop ratio, and the hoop ratio is preferably 70 to 90% by mass.
- C (Hoop) contributes to the improvement of strength.
- the lower limit is not specified for adjusting the tensile strength, it is preferably 0.005% by mass or more from the viewpoint of the mechanical performance of the weld metal.
- the C (Hop) content is more preferably 0.030% by mass or less with respect to the total mass of the hoop.
- Si contributes to the electrical resistance of the metal leaf.
- the Si content is 0.005% by mass or more with respect to the total mass of the hoop.
- the Si content is preferably 0.050% by mass or less from the viewpoint of welding workability.
- the welding amount can be increased as in the case of Si (Hoop) . Further, by setting the upper limit of the Mn (Hoop) content to 0.40% by mass or less, the welding workability is improved as in the case of Si (Hoop) .
- P and S (Hoop) are preferably 0.01% by mass or less, respectively.
- P is an element contained as an impurity, but it tends to segregate and deteriorates toughness and weldability. Therefore, the lower the content, the more preferable.
- S has a property of lowering the surface tension. When welding is performed with a wire having a large amount of S in the total mass of the wire, the surface tension on the surface of the molten pool becomes low, and the melt-off and deterioration of the bead appearance become remarkable. On the other hand, from the viewpoint of droplet transfer, the lower the surface tension, the more the droplet detachment is promoted and the welding workability is improved.
- the above parameter is preferably 0.25 or less from the viewpoint of welding workability.
- the above parameter is preferably 0.01 or more.
- SUS-based metal foil examples include C (Hoop) : 0.0001 to 0.06% by mass, Si (Hop) : 0.1 to 0.8% by mass, and Mn (Hoop ) with respect to the total mass of the hoop. ) : 0.05 to 3.00% by mass, P (Hoop) : 0.05% by mass or less, S (Hoop) : 0.05% by mass or less, Cr (Hoop) : 10.5 to 30.0% by mass And Ni (Hop) : A metal foil containing 3.0 to 14.0% by mass.
- the Cr and Ni the relationship of the amount Cr (Hoop) and Ni (Hoop) and the content Cr to total mass of the wire (wire) and Ni (wire) for the hoop to the total mass, 0.80 ⁇ ⁇ (Cr ( Hop) + Ni (Hoop) ) ⁇ (HR / 100) / (Cr (wire) + Ni (wire) ) ⁇ ⁇ 1.20 is preferable.
- HR means a hoop ratio, and the hoop ratio is preferably 70 to 90% by mass.
- C contributes to the improvement of strength.
- the C content is preferably 0.0001% by mass or more from the viewpoint of the mechanical performance of the weld metal.
- the C content is 0.06% by mass or less, the hoop can be easily processed and the wire can be easily manufactured, which is preferable.
- Si contributes to the electrical resistance of the metal leaf.
- the Si content is more preferably 0.1% by mass or more with respect to the total mass of the hoop.
- the Si content is preferably 0.8% by mass or less from the viewpoint of welding workability.
- Mn contributes to electrical resistance in the same manner as Si.
- the Mn content is preferably 0.05% by mass or more, and more preferably 0.1% by mass or more. Further, from the viewpoint of welding workability, the Mn content is preferably 3.00% by mass or less, more preferably 2.50% by mass or less.
- P and S are preferably 0.05% by mass or less, respectively.
- P is an element contained as an impurity, but it tends to segregate and deteriorates toughness and weldability. Therefore, the lower the content, the more preferable.
- S has a property of lowering the surface tension. When welding is performed with a wire having a large amount of S in the total mass of the wire, the surface tension on the surface of the molten pool becomes low, and the melt-off and deterioration of the bead appearance become remarkable. On the other hand, from the viewpoint of droplet transfer, the lower the surface tension, the more the droplet detachment is promoted and the welding workability is improved.
- the hoop portion occupies most of the droplets formed at the tip of the wire during welding, it is preferable to add an appropriate amount of S to the hoop in consideration of welding workability. ..
- the above effect can be expected by setting the content of S (Hoop) in the hoop to 0.0005% by mass or more with respect to the total mass of the hoop, which is preferable.
- S (Hop) is excessively added to the hoop, the surface tension becomes too low, and the arc pressure may blow off the droplets and sputter, so that S (Hop) is contained.
- the amount is preferably 0.05% by mass or less.
- Cr is an essential element, and the amount of Cr added contributes more to the electrical resistance of the metal leaf than Si or Mn.
- the content of Cr (Hoop) is 10.5% by mass or more with respect to the total mass of the hoop.
- the Cr (Hoop) content is preferably 30.0% by mass or less from the viewpoint of welding workability.
- Ni is an essential element like Cr, and its addition amount contributes more to the electrical resistance of the metal leaf than Si and Mn.
- the content of Ni (Hoop) is 3.0% by mass or more with respect to the total mass of the hoop.
- the content of Ni (Hoop) is preferably 14.0% by mass or less from the viewpoint of welding workability.
- the welding amount increases and the efficiency is improved.
- the above parameter is preferably 1.20 or less.
- the flux-cored wire according to the present embodiment does not melt off even under the condition of a welding current of more than 200 A, and has an excellent bead appearance, so that welding can be performed with high efficiency.
- the welding posture is not particularly limited, but is preferably used for all welding postures because of its excellent melt-down resistance, and is particularly preferably used for welding in at least one of an upright posture and an upward posture. Further, it can be suitably used for welding in which the posture changes continuously from the upward posture to the vertical posture.
- the type of gas used for welding is not particularly limited, and examples thereof include Ar gas, CO 2 gas, O 2 gas alone, and a mixed gas thereof.
- Ar gas it is preferable to use a shield gas containing 70% by volume or more of Ar.
- CO 2 gas it is preferable to use a shield gas containing 70% by volume or more of CO 2 .
- the flow rate of the gas is also not particularly limited, but is, for example, about 15 to 30 L / min.
- the shape of the welding current waveform to be set may be a straight line or a pulse shape.
- the straight line here means that the waveform shape is not special.
- the welding current range is preferably used in the range of low current to high current, and even in the case of upward welding or vertical welding, it can be used at more than 200 A.
- the welding voltage is also not particularly limited, and is, for example, 15 to 35V.
- the welding speed is also not particularly limited, but is, for example, 10 to 50 cm / min.
- the wire protrusion length is not particularly limited, and may be set to, for example, 10 to 30 mm. All of the above conditions are not limited to these examples, and the welding conditions may be determined according to the application.
- composition of flux-cored wire The content with respect to the total mass of the wire is shown in Tables 1 and 2, and the content with respect to the total mass of the flux is shown in Table 3, respectively.
- the water content (WC) with respect to the total mass of the wire was measured by a Karl Fischer moisture measuring device (coulometric moisture meter) using CA-200 manufactured by Mitsubishi Chemical Analytech.
- the measurement conditions are as follows. Three samples in which the flux-cored wire was cut to 3 cm were prepared, and the water content was evaluated by measuring with the Karl Fischer method. At the time of measurement, heating was performed at 750 ° C. in order to vaporize the water content of the flux in the flux-containing wire, and the dried air was guided to the measuring device as a carrier gas. The results are shown in "Wire Moisture (WC)" in Table 2, and the unit is mass%.
- W15 to W20 which contain Al and Mg as strongly deoxidized metal elements and whose total content with respect to the total mass of the wire is less than 2.2% by mass, all have excellent melt resistance and bead appearance.
- the result was inferior. It was also confirmed that the ratio of the content of the strongly deoxidized metal element to the water content with respect to the total mass of the wire affects the melt resistance and the appearance of the bead.
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Abstract
Description
[1]コアとなるフラックスと、外皮となるフープとを含むフラックス入りワイヤであって、前記フラックスは、Mg及びAlを含む強脱酸金属元素(flux)と、フッ素化合物粉(flux)とを含み、前記強脱酸金属元素(flux)の合計の含有量は前記フラックス全質量に対して15~35質量%であり、前記強脱酸金属元素(flux)のうちMg及びAlは、少なくとも一部が、金属粉及び合金粉の少なくともいずれか一方である強脱酸金属粉(flux)として含まれ、前記強脱酸金属粉(flux)は、60質量%以上が150μm以下の粒度であり、前記フッ素化合物粉(flux)の合計の含有量は前記フラックス全質量に対して10~45質量%であり、前記フッ素化合物粉(flux)は、60質量%以上が75μm以下の粒度であり、前記フラックス入りワイヤは前記フラックスをワイヤ全質量に対して10~30質量%含有し、かつ前記フラックス入りワイヤはワイヤ全質量に対して、C(wire):0.5質量%以下、Si(wire):0.05~1.0質量%、Al(wire):1.0~3.5質量%、Mn(wire):1.0~3.0質量%、Mg(wire):0.3~0.9質量%、フッ素化合物(wire)のフッ素換算値Fの合計:0.30~1.20質量%、及び強脱酸金属元素(wire)の合計:2.2質量%以上、を含有するフラックス入りワイヤ。
[2]前記フラックス入りワイヤはワイヤ全質量に対して、Ni(wire):15質量%以下、Mo(wire):5.0質量%以下、W(wire):3.0質量%以下、Nb(wire):5.0質量%以下、V(wire):5.0質量%以下、Cr(wire):30質量%以下、Ti(wire):3.0質量%以下、Zr(wire):2.0質量%以下、O(wire):0.05質量%以下、N(wire):0.05質量%以下、S(wire):0.05質量%以下、P(wire):0.05質量%以下、B(wire):0.05質量%以下、Cu(wire):5.0質量%以下、Ba(wire):5.0質量%以下、アルカリ金属元素(wire)の合計:3.0質量%以下、Ca(wire):3.0質量%以下、希土類元素(wire)の合計:0.5質量%以下、及びFe(wire):40質量%以上をさらに含有する前記[1]に記載のフラックス入りワイヤ。
[3]前記フッ素化合物粉(flux)はBaF2、SrF2、Na3AlF6、NaF、MgF2及びCaF2からなる群より選ばれる少なくとも1の化合物粉である前記[1]に記載のフラックス入りワイヤ。
[4]前記フッ素化合物粉(flux)はBaF2、SrF2、Na3AlF6、NaF、MgF2及びCaF2からなる群より選ばれる少なくとも1の化合物粉である前記[2]に記載のフラックス入りワイヤ。
[5]ワイヤ全質量に対する水分量(WC)が0.010~0.100質量%であり、かつ前記水分量(WC)と前記強脱酸金属元素(wire)の合計の含有量とが、105≦(強脱酸金属元素(wire)の合計の含有量/WC)≦170の関係を満たす前記[1]~[4]のいずれか1に記載のフラックス入りワイヤ。
[6]ワイヤ全質量に対する前記Al(wire)及び前記Mg(wire)の含有量が、0.35≦(2×Mg(wire)/0.6×Al(wire))≦1.50の関係を満たす前記[1]~[4]のいずれか1に記載のフラックス入りワイヤ。
[7]前記強脱酸金属元素(flux)として、Zr、Ti及びCaからなる群より選ばれる少なくとも1の元素をさらに含み、ワイヤ全質量に対する各元素の含有量が、5≦{(Mg(wire)+Al(wire))/(Zr(wire)+Ti(wire)+Ca(wire))}≦70の関係を満たす前記[1]~[4]のいずれか1に記載のフラックス入りワイヤ。
[8]前記フラックスにNiを、金属Ni、Cu-Ni、Fe-Ni、及びNi-Mgからなる群より選ばれる少なくとも1種として含む前記[1]~[4]のいずれか1に記載のフラックス入りワイヤ。
[9]前記[1]~[4]のいずれか1に記載のフラックス入りワイヤを用いたガスシールドアーク溶接方法であって、溶接電流を200A超とし、シールドガス雰囲気中で溶接を行うガスシールドアーク溶接方法。
[10]上向姿勢及び立向姿勢の少なくともいずれか一方の溶接姿勢で溶接を行う前記[9]に記載のガスシールドアーク溶接方法。
[11]前記シールドガスがArを70体積%以上含む前記[9]に記載のガスシールドアーク溶接方法。
[12]前記シールドガスがCO2を70体積%以上含む前記[9]に記載のガスシールドアーク溶接方法。
明細書中、「~」とは、その前後に記載された数値を下限値及び上限値として含む意味で使用される。また、物質名や元素の直後に付与する「(flux)」とは、フラックス中に含まれるものを指す。同様に、「(wire)」とは、フラックス入りワイヤ中に含まれるものを指し、「(Hoop)」とは、フープ中に含まれるものを指す。
フラックスは、Mg及びAlを含む強脱酸金属元素(flux)と、フッ素化合物粉(flux)とを含み、上記強脱酸金属元素(flux)の合計の含有量はフラックス全質量に対して15~35質量%である。上記強脱酸金属元素(flux)に係る1種以上の、金属粉及び合金粉の少なくともいずれか一方を、強脱酸金属粉(flux)として含み、強脱酸金属粉(flux)は、60質量%以上が150μm以下の粒度である。
また、上記フッ素化合物粉(flux)の合計の含有量はフラックス全質量に対して10~45質量%であり、フッ素化合物粉(flux)は、60質量%以上が75μm以下の粒度である。
フラックス入りワイヤはフラックスをワイヤ全質量に対して10~30質量%含有する。すなわち、フラックス率は10~30質量%である。
さらに、フラックス入りワイヤはワイヤ全質量に対して、C(wire):0.5質量%以下、Si(wire):0.05~1.0質量%、Al(wire):1.0~3.5質量%、Mn(wire):1.0~3.0質量%、Mg(wire):0.3~0.9質量%、フッ素化合物(wire)のフッ素換算値Fの合計:0.30~1.20質量%、及び強脱酸金属元素(wire)の合計:2.2質量%以上、を含有する。
本実施形態に係るフラックス入りワイヤのコアとなるフラックスは、強脱酸金属元素(flux)とフッ素化合物粉(flux)とを含む。強脱酸金属元素とは、Mg及びAlの2種以上を必須として含み、その他の強脱酸金属元素として、Ti、Zr、Ca、希土類元素(以後「REM」と称することがある。)等が任意に含まれてもよい、任意の強脱酸金属元素として、Ti、Zr及びCaからなる群より選ばれる少なくとも1の元素をさらに含むことが好ましい。なお、フラックスは、強脱酸金属元素とフッ素化合物粉以外にも、必要に応じて、Ni;SiやMn等の脱酸元素;SiO2、TiO2、FeO等の酸化物;窒化物等を添加してもよく、残部は鉄粉および不純物となる。
Mg(wire)の含有量を、ワイヤ全質量に対して0.3質量%以上とすることで、上記強脱酸金属元素としての効果を得ることができる。一方、含有量の上限を0.9質量%以下とすることにより、溶接部に介在物が形成されて機械的性能が十分に得られないことを防ぐことができる。
よって、Mg(wire)の含有量はワイヤ全質量に対して0.3~0.9質量%であり、0.55質量%以上が好ましく、また、0.85質量%以下が好ましい。また、フラックス中に含まれるMg(flux)の含有量は、フラックス全質量に対し、1.5質量%以上が好ましく、また、8.0質量%以下が好ましい。
Al(wire)の含有量を、ワイヤ全質量に対して1.0質量%以上とすることで、早期のスラグ形成効果による耐溶落ち性およびアークを安定させ、爆発移行を推進させる効果を得ることができる。一方、含有量の上限を3.5質量%以下とすることにより、過剰な爆発移行となることも防ぐことができるため、アークが安定する。
よって、Al(wire)の含有量はワイヤ全質量に対して1.0~3.5質量%であり、1.8質量%以上が好ましく、また、3.1質量%以下が好ましい。また、フラックス中に含まれるAl(flux)の含有量は、フラックス全質量に対し、10.0質量%以上が好ましく、また、25.0質量%以下が好ましい。
このAlとMgを含む酸化物であるスラグはMgAl2O4やFeAl2O4などを含有するスピネル構造を有し、非常に安定で高融点の酸化物となる。当該スラグの凝固速度は例えば通常のチタンスラグ系の凝固速度よりも速く、特に上向溶接や立向溶接時において耐溶落ち性に優れる。
なお、本明細書において、強脱酸金属粉やフッ素化合物粉の粒度は、JIS Z 8801-1:2006に基づき、適切な目開きサイズの篩を用いて測定することができる。
なお、強脱酸金属元素としてAl及びMg以外に、後述するZr、Ti、Ca、REMといった元素が含まれる場合には、それら元素も含めた合計の含有量を強脱酸金属元素(wire)又は強脱酸金属元素(flux)の合計の含有量とする。
Cは溶接金属の強度調整のために任意で添加するため下限は規定しない。一方、C(wire)をワイヤ全質量に対して0.5質量%以下とすることにより、溶接金属の強度が高くなり過ぎて靱性が低下するのを防ぐことができる。C(wire)の含有量は0.2質量%以下が好ましい。
Mnは脱酸効果および固溶強化として有効な元素であり、引張強度および靱性といった機械的性能を向上させることができる。Mn(wire)の含有量は、ワイヤ全質量に対して1.0~3.0質量%である。1.0質量%以上含有することにより、固溶強化の効果を十分に得ることができ、良好な機械的性能が得られる。また、含有量を3.0質量%以下とすることにより、過剰な強度向上を抑制することができ、適正な靱性を確保することができる。Mnの含有量はワイヤ全質量に対して1.5質量%以上が好ましく、また、2.5質量%以下が好ましく、2.0質量%以下がより好ましい。
Siは母材と溶接金属とのなじみをよくする元素であることから、フラックス中に、ワイヤ全質量に対して0.05質量%以上含む。また、靱性を低下させないために、その上限を1.0質量%とする。上記効果をより得るためには、Siの含有量は0.1質量%以上が好ましく、また、0.80質量%以下が好ましい。
<Ni(wire):15質量%以下>
Niは高入熱・高パス間温度において、靱性および引張強度を向上させることが可能となる元素であることから、必要であれば任意で添加してもよい。Niを過剰に添加すると溶融池の粘性が低下する。上向溶接や立向溶接の場合に溶融池の粘性が低下すると、重力の影響によって溶落ちやビード外観不良といった溶接欠陥が発生する危険性がある。そのため、Ni(wire)を任意で添加する場合はワイヤ全質量に対して15質量%以下が好ましく、5質量%以下とすることがより好ましい。また、上記効果を得るためには、Niの含有量は0.01質量%以上が好ましく、0.05質量%以上がより好ましい。
<Nb(wire):5.0質量%以下>
<V(wire):5.0質量%以下>
<Cr(wire):30質量%以下>
Mo、Nb、V、及びCrはいずれも靱性または引張強度を向上させることが可能となる元素であることから、靱性または引張強度を調整するために必要であれば任意で添加してもよい。また、これらの元素は高融点の炭化物を形成する元素である。なお、高融点の炭化物の一例として、Mo2C、NbC、VC、Cr3C2が挙げられる。これらの炭化物は高融点ゆえに、スラグとして溶融池の表面上に早期形成される。この特性から、上向溶接時の溶落ち抑制や良好なビード外観を得ることが出来る。
Wは強度向上に有効な元素であることから引張強度を調整するために必要であれば任意で添加してもよい。Wを過剰に添加すると強度過剰による靱性劣化が起こることから、Wの含有量はワイヤ全質量に対して3.0質量%以下が好ましい。
Tiは強脱酸金属元素であり、脱酸効果による靱性向上に有効な元素である。靱性の調整のために適正量添加してもよいが、Tiを過剰に添加すると介在物の粗大化、介在物量過多となることから、靱性が低下する。したがって、Tiの含有量は、ワイヤ全質量に対して3.0質量%以下に抑制することが好ましい。
ZrはTiと同様、強脱酸金属元素であり、脱酸効果による靱性向上に有効な元素である。靱性の調整のために適正量添加してもよいが、Zrを過剰に添加すると介在物の粗大化、介在物量過多となることから、靱性が低下する。したがって、Zrの含有量はワイヤ全質量に対して2.0質量%以下が好ましい。
Caは、CaF2、CaCO3等から添加され、Ti、Zrと同様、強脱酸金属元素であり、脱酸効果による靱性向上に有効な元素である。靱性の調整のために適正量添加してもよいが、Caを過剰に添加すると介在物の粗大化、介在物量過多となることから、靱性が低下する。したがって、Caの含有量はワイヤ全質量に対して3.0質量%以下が好ましい。
REM(希土類金属)はアークを安定にし、スパッタ低減に有効な元素である。また、脱酸、脱硫効果もあり、靱性の向上にも寄与する。REMを過剰に添加するとアーク偏向が起こり易くなり、溶接作業性が劣化する。そのため、REMの含有量の合計はワイヤ全質量に対して0.5質量%以下が好ましく、0.2質量%以下がより好ましい。REMとしては、La、Ce、Yがより好ましく用いられる。
上記比率は25以上がより好ましく、27以上がさらに好ましく、また、60以下がより好ましく、55以下がさらに好ましい。
Oは、シールドガスやフラックス中の酸化物、水分等から供給される。溶接中にOが過剰に添加されると溶融池の表面張力が低下し、上向溶接や立向溶接において溶落ちやビード外観不良が発生する。そのため、O(wire)の含有量はワイヤ全質量に対して0.05質量%以下が好ましく、0.04質量%以下がより好ましい。一方ワイヤ中に含まれる酸素は溶接金属中でAl、Mgなどの金属と酸化反応を起こすことによって、酸化物(スラグ)が溶融池上に形成する。これにより、立向溶接や上向溶接等の全姿勢溶接において耐溶落ち性を向上させることが可能となる。
Nは強度向上に有効であるとともに、Ti、Zr、Nb、CrやMnと結合し、窒化物を形成し、靱性に寄与する。強度過剰による靱性の劣化や気孔欠陥や割れ等の溶接欠陥の発生を抑制するため、N(wire)の含有量は0.05質量%以下であることが望ましい。
SはOと同じように、溶融池の表面張力を低下する元素である。また、多量に添加すると、割れが発生する可能性が高くなる。よって、耐溶落ち性、ビード外観形状、耐割れ性の観点からS(wire)の含有量は0.05質量%以下あることが好ましい。
Pは不純物元素であり、耐割れ性の観点からP(wire)の含有量は0.05質量%以下に抑制することが好ましい。
Bは、微量の添加により溶接金属のミクロ組織を微細化し、溶接金属の低温靱性を向上させる効果がある。溶接金属に高温割れが発生するのを抑制するため、B(wire)の含有量はワイヤ全質量に対して、0.05質量%以下が好ましい。なお、Bは、鋼製外皮に含まれる成分の他、フラックスからの金属B、Fe-B、Fe-Mn-B、Mn-B等の合金粉末から添加できる。
Cuは、溶接金属の強度向上に寄与する元素である。溶接金属の強度が過剰になり靱性が低下するのを抑制するため、ワイヤ全質量に対してCu(wire)の含有量は5.0質量%以下が望ましい。なお、Cuは鋼製外皮表面に施したフープCuめっき分の他、フラックスからの金属Cu、Cu-Zr、Fe-Si-Cu等の合金粉末から添加できる。
Baは、BaF2、BaCO3等から添加され、アークを安定にし、スパッタ発生量を低減する効果を有する。しかしながら、Baは過剰に添加すると、アーク偏向が起こり、溶接作業性が劣化する。したがって、ワイヤ全質量に対してBa(wire)の含有量は5.0質量%以下が好ましく、3.0質量%以下がより好ましい。
アルカリ金属元素はアーク安定性が向上し、スパッタ低減等の溶接作業性向上に寄与する。アルカリ金属元素に係る化合物を過剰に添加するとワイヤの耐吸湿性が劣化し、割れおよび気孔欠陥等の溶接欠陥が発生する可能性がある。そのため、アルカリ金属元素の合計の含有量は、ワイヤ全質量に対して3.0質量%以下が好ましい。なおアルカリ金属元素は、Na、K、Li等が挙げられ、酸化物、弗化物等の形態でフラックスに添加、またはフープ表面に付着させる。
Fe(wire)の含有量は40質量%以上が好ましく、60質量%以上がより好ましく、80質量%以上がさらに好ましい。また、Fe(wire)の含有量は95質量%以下が好ましく、94質量%以下がより好ましい。Feは外皮を構成するFe(Hoop)やフラックスに添加されている鉄粉、合金粉のFe(flux)として含有される。
ワイヤの残部は不純物となり、例えば、Ta、Be等が挙げられる。
本実施形態に係るフラックス入りワイヤの外皮となるフープは、厚さも幅も特に限定されないが、例えば厚さは0.5mm以上が好ましく、1.5mm以下が好ましい。また、幅は30mm以下が好ましい。
フープの厚さを0.5mm以上とすることにより、溶接によって加熱された時にシーム部からフラックスが漏れ出しにくく、スパッタの発生を抑制することができる。また、厚さを1.5mm以下とすることにより、溶滴の粗大化を抑制でき、爆発移行時の離脱溶滴の微細化を図ることができるため、スパッタの発生を抑制することができる。
Pは不純物として含まれる元素であるが、偏析しやすく靱性や溶接性を悪化させることから、その含有量は低いほど好ましい。
Sは表面張力を低下させる特性を持つ。ワイヤ全質量におけるS量が多いワイヤで溶接した場合、溶融池の表面の表面張力は低くなり、溶落ちやビード外観の劣化が顕著になる。一方で、溶滴移行の観点からいうと、表面張力が低い方が、溶滴離脱が促進し溶接作業性が良好となる。
{(Si(Hoop)+Mn(Hoop))×(HR/100)/(Si(wire)+Mn(wire))}を0.01以上とすることで、溶着量の減少による能率の悪化を抑制できる傾向にある。したがって、上記パラメータは0.01以上であることが好ましい。
Pは不純物として含まれる元素であるが、偏析しやすく靱性や溶接性を悪化させることから、その含有量は低いほど好ましい。
Sは表面張力を低下させる特性を持つ。ワイヤ全質量におけるS量が多いワイヤで溶接した場合、溶融池の表面の表面張力は低くなり、溶落ちやビード外観の劣化が顕著になる。一方で、溶滴移行の観点からいうと、表面張力が低い方が、溶滴離脱が促進し溶接作業性が良好となる。本実施形態のフラックス入りワイヤはフープ部分が溶接中にワイヤ先端で形成する溶滴の大部分を占めることから、フープにSを適量添加する形態とすることが溶接作業性を考えた上で好ましい。フープ中のS(Hoop)の含有量はフープ全質量に対して0.0005質量%以上とすることで上記効果を期待でき、好ましい。一方、S(Hoop)をフープ中に過度に添加すると、表面張力が低くなり過ぎてしまい、アーク圧によって、溶滴が吹き飛ばされ、スパッタ化してしまう可能性があるため、S(Hoop)の含有量は0.05質量%以下とすることが好ましい。
本実施形態に係るフラックス入りワイヤは、溶接電流200A超の条件下でも溶落ちが生じることなく、ビード外観にも優れるため、高能率での溶接が可能である。
溶接姿勢は特に限定されないが、耐溶落ち性に優れることから全溶接姿勢に好適に用いられ、特に立向姿勢及び上向姿勢の少なくともいずれか一方の溶接姿勢での溶接により好適に用いられる。また、上向姿勢から立向姿勢まで連続して姿勢が変化していくような溶接にも好適に用いることができる。
溶接に用いられるガスの種類は特に制限されないが、例えばArガス、CO2ガス、O2ガス単体およびこれらの混合ガス等が挙げられる。Arガスを用いる場合には、Arを70体積%以上含むシールドガスを用いることが好ましい。CO2ガスを用いる場合には、CO2を70体積%以上含むシールドガスを用いることが好ましい。
ガスの流量も特に制限されないが、例えば15~30L/min程度である。
直流である場合、溶接電流範囲は低電流から高電流の範囲に好適に用いられ、上向溶接又は立向溶接の場合でも、200A超で使用可能である。溶接電圧も特に限定されず、例えば15~35Vである。溶接速度も特に限定されないが、例えば10~50cm/分である。その他、ワイヤ突出し長さについても特に制限されず、例えば10~30mmに設定すればよい。上記条件はいずれも、これらの例に限定されるものでは無く、用途に応じて溶接条件を決定すればよい。
(強脱酸金属粉(flux)及びフッ素化合物粉(flux)の粒度)
フラックスに含まれる、強脱酸金属粉(flux)(Al粉、Mg粉、及びAl-Mg粉)の粒度とその割合は、JIS Z 8801-1:2006に基づき、目開き150μmの篩を用いて測定した。結果を表3の「フラックス中の強脱酸金属元素、粒度150μm以下の割合」に示す。
フラックスに含まれる、フッ素化合物粉(flux)の粒度とその割合は、JIS Z 8801-1:2006に基づき、目開き75μmの篩を用いて測定した。結果を表3の「フラックス中のフッ素化合物粉、粒度75μm以下の割合」に示す。
ワイヤ全質量に対する含有量を表1及び表2に、フラックス全質量に対する含有量は表3に、それぞれ示す。
ワイヤ全質量に対する水分量(WC)は三菱ケミカルアナリテック社製のCA-200を用いたカールフィッシャー水分測定装置(電量法水分計)により測定した。測定条件は以下のとおりである。
フラックス入りワイヤを3cmに切断した試料を3本用意し、水分量をカールフィッシャー法で測定することで評価した。測定時、フラックス入りワイヤ中フラックスの水分を気化させるために750℃で加熱を行い、乾燥させた空気をキャリアガスとして測定装置へ導いた。結果を表2の「ワイヤ水分量(WC)」に示すが、単位は質量%である。
圧延鋼材SS400(JIS G 3106:2017)からなる、板厚12mmの平板に対し、得られたフラックス入りワイヤを用いて下記条件によりビードオンプレート溶接を行った。なお、溶接電圧(アーク電圧)、溶接速度、送給速度は表4に記載のとおりである。
・ワイヤ径:φ1.4mm
・シールドガス:CO2、流量25L/min
・溶接姿勢:上向姿勢
・溶接電流:直流正極性
・ワイヤ突出し長さ:15mm
溶接電流は90Aから溶接を始め、溶接電流を徐々に上げていき、溶落ちが発生しない最大の電流値を「境界電流」とした。
溶落ちしない境界電流とその他条件を表4に示す。
耐溶落ち性は、溶接電流値を上げながら上向溶接を行い、溶落ちの有無を目視で評価した。溶落ちが発生しない最大の電流値である境界電流値を求めた。評価は、境界電流値が230A以上であったものを「A」とし、200A以上230A未満であったものを「B」とし、200A未満であったものを「C」とした。A及びBが合格であり、Cが不合格である。結果を表4に示す。
ビード外観は、上向姿勢で溶接長さ30cmの溶接を行い、溶接部のビード形状を目視観察することにより評価を行った。評価は、良好なビード形状を「A」とし、ビード幅が変動する箇所が2か所以下である場合を「B」とし、ビード幅が変動する箇所が3か所以上である場合を「C」とした。A及びBが合格であり、Cが不合格である。結果を表4に示す。
軟鋼を外皮とし、この外皮を円筒状に成型しながら、その内部にフラックスを充填することで、表1及び表2に示す組成を有する実施例(W1~W14)及び比較例(W15~W20)のフラックス入りワイヤを作製した。なお、表1及び表2に示すW1~W20のフラックス率はいずれも13質量%であり、表1及び表2に示すW1~W20の組成の残部はFe及び不純物で構成されている。
表1中の各欄の数値は各成分のワイヤ全質量あたりの含有量(質量%)を示し、「REM」欄の数値は希土類元素の含有量(質量%)の合計を示す。また、表中の「-」とは検出限界以下であったことを意味する。
表2に示しているフラックス中のフッ素化合物粉の添加量、並びに、フラックス中の強脱酸金属元素の添加量、Mg(flux)の含有量、及びAl(flux)の含有量はいずれも、フラックス全質量あたりの含有量(質量%)を示す。
Claims (12)
- コアとなるフラックスと、外皮となるフープとを含むフラックス入りワイヤであって、
前記フラックスは、Mg及びAlを含む強脱酸金属元素(flux)と、フッ素化合物粉(flux)とを含み、
前記強脱酸金属元素(flux)の合計の含有量は前記フラックス全質量に対して15~35質量%であり、
前記強脱酸金属元素(flux)のうちMg及びAlは、少なくとも一部が、金属粉及び合金粉の少なくともいずれか一方である強脱酸金属粉(flux)として含まれ、
前記強脱酸金属粉(flux)は、60質量%以上が150μm以下の粒度であり、
前記フッ素化合物粉(flux)の合計の含有量は前記フラックス全質量に対して10~45質量%であり、
前記フッ素化合物粉(flux)は、60質量%以上が75μm以下の粒度であり、
前記フラックス入りワイヤは前記フラックスをワイヤ全質量に対して10~30質量%含有し、かつ
前記フラックス入りワイヤはワイヤ全質量に対して、C(wire):0.5質量%以下、Si(wire):0.05~1.0質量%、Al(wire):1.0~3.5質量%、Mn(wire):1.0~3.0質量%、Mg(wire):0.3~0.9質量%、フッ素化合物(wire)のフッ素換算値Fの合計:0.30~1.20質量%、及び強脱酸金属元素(wire)の合計:2.2質量%以上、を含有するフラックス入りワイヤ。 - 前記フラックス入りワイヤはワイヤ全質量に対して、Ni(wire):15質量%以下、Mo(wire):5.0質量%以下、W(wire):3.0質量%以下、Nb(wire):5.0質量%以下、V(wire):5.0質量%以下、Cr(wire):30質量%以下、Ti(wire):3.0質量%以下、Zr(wire):2.0質量%以下、O(wire):0.05質量%以下、N(wire):0.05質量%以下、S(wire):0.05質量%以下、P(wire):0.05質量%以下、B(wire):0.05質量%以下、Cu(wire):5.0質量%以下、Ba(wire):5.0質量%以下、アルカリ金属元素(wire)の合計:3.0質量%以下、Ca(wire):3.0質量%以下、希土類元素(wire)の合計:0.5質量%以下、及びFe(wire):40質量%以上をさらに含有する請求項1に記載のフラックス入りワイヤ。
- 前記フッ素化合物粉(flux)はBaF2、SrF2、Na3AlF6、NaF、MgF2及びCaF2からなる群より選ばれる少なくとも1の化合物粉である請求項1に記載のフラックス入りワイヤ。
- 前記フッ素化合物粉(flux)はBaF2、SrF2、Na3AlF6、NaF、MgF2及びCaF2からなる群より選ばれる少なくとも1の化合物粉である請求項2に記載のフラックス入りワイヤ。
- ワイヤ全質量に対する水分量(WC)が0.010~0.100質量%であり、かつ
前記水分量(WC)と前記強脱酸金属元素(wire)の合計の含有量とが、105≦(強脱酸金属元素(wire)の合計の含有量/WC)≦170の関係を満たす請求項1~4のいずれか1項に記載のフラックス入りワイヤ。 - ワイヤ全質量に対する前記Al(wire)及び前記Mg(wire)の含有量が、0.35≦(2×Mg(wire)/0.6×Al(wire))≦1.50の関係を満たす請求項1~4のいずれか1項に記載のフラックス入りワイヤ。
- 前記強脱酸金属元素(flux)として、Zr、Ti及びCaからなる群より選ばれる少なくとも1の元素をさらに含み、ワイヤ全質量に対する各元素の含有量が、5≦{(Mg(wire)+Al(wire))/(Zr(wire)+Ti(wire)+Ca(wire))}≦70の関係を満たす請求項1~4のいずれか1項に記載のフラックス入りワイヤ。
- 前記フラックスにNiを、金属Ni、Cu-Ni、Fe-Ni、及びNi-Mgからなる群より選ばれる少なくとも1種として含む請求項1~4のいずれか1項に記載のフラックス入りワイヤ。
- 請求項1~4のいずれか1項に記載のフラックス入りワイヤを用いたガスシールドアーク溶接方法であって、溶接電流を200A超とし、シールドガス雰囲気中で溶接を行うガスシールドアーク溶接方法。
- 上向姿勢及び立向姿勢の少なくともいずれか一方の溶接姿勢で溶接を行う請求項9に記載のガスシールドアーク溶接方法。
- 前記シールドガスがArを70体積%以上含む請求項9に記載のガスシールドアーク溶接方法。
- 前記シールドガスがCO2を70体積%以上含む請求項9に記載のガスシールドアーク溶接方法。
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