CN104070305A - Flux cored wire for gas shielded arc welding - Google Patents

Flux cored wire for gas shielded arc welding Download PDF

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Publication number
CN104070305A
CN104070305A CN201310704268.9A CN201310704268A CN104070305A CN 104070305 A CN104070305 A CN 104070305A CN 201310704268 A CN201310704268 A CN 201310704268A CN 104070305 A CN104070305 A CN 104070305A
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China
Prior art keywords
quality
compound
welding
scaled value
flux
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Inventor
石崎圭人
小池贵之
古川尚英
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Kobe Steel Ltd
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Kobe Steel Ltd
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Priority to CN201910534785.3A priority Critical patent/CN110153593A/en
Publication of CN104070305A publication Critical patent/CN104070305A/en
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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
    • B23K35/3026—Mn 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
    • B23K35/3093—Fe as the principal constituent with other elements as next major constituents
    • 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
    • B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
    • B23K35/325—Ti 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
    • B23K35/36—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
    • B23K35/362—Selection of compositions of fluxes
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
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    • H01L2924/01—Chemical elements
    • H01L2924/01009—Fluorine [F]
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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Nonmetallic Welding Materials (AREA)
  • Arc Welding In General (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

The invention provides a flux cored wire for gas shielded arc welding, which has the following advantages in corner welding: excellent welding operability, high gas hole resistance, excellent welding channel shape and excellent slag detachability. The flux cored wire for gas shielded arc welding comprises the following components relative to total mass of the wire: 1.0-4.0% by mass of Ti, 0.5-2.5% by mass of Si, 0.1-0.6% by mass of Zr, 2.0-3.0% by mass of Mn, 0.02-0.10% by mass of C, 0.005-0.030% by mass of S, 0.05-0.040% by mass of Bi, 0.01-0.20% by mass of Na, 0.01-0.20% by mass of K, 0.01-0.20% by mass of F, 0.05-0.50% by mass of Al, and 0.05-0.50% by mass of Mg. Simultaneously the components satisfy the formulae (I)-(III). The formulae are shown in the description.

Description

Flux-cored wire for gas-shielded arc welding
Technical field
The present invention relates to flux-cored wire for gas-shielded arc welding.More specifically, relate to the flux-cored wire for gas-shielded arc welding that can be used for fillet welding.
Background technology
In the fields such as boats and ships and bridge, fillet welding is widely used.In addition, conventionally in the large structures such as boats and ships and bridge, in order to prevent from getting rusty, use the primer painting steel that applied an antirusting paint in during making.But, when primer painting steel are carried out to fillet welding, due to the impact of antirusting paint, easily there is the pores such as pit, channeling and bubble, in addition, because electric arc easily becomes unstable, thereby there is weld bead shape and the deteriorated problem of the removability of slag.
The appearance of this pore, weld bead shape and the removability of slag deteriorated, owing to causing rework operation and except the increase of slag operation, has therefore become and has realized large obstacle in the automation of fillet welding and high efficiency.Therefore, all the time, for the characteristics such as gasproof permeability, weld bead shape and the removability of slag of improving about the fillet welding of primer painting steel have proposed all schemes (for example, with reference to patent documentation 1～3).
In the flux-cored wire described in patent documentation 1, by by ZrO 2as slag forming agent main component, realize thus and improve gasproof hole (resistance to pit) property.On the other hand, in the flux-cored wire described in patent documentation 2, in order to obtain gasproof permeability in the horizontal fillet welding at the thicker primer coating steel plate of priming paint thickness, with TiO 2as principal component, and by SiO 2-ZrO 2amount is set as suitable scope.In addition, the flux-cored wire described in patent documentation 3 is in order to improve gasproof permeability, and maintains good weld bead shape and welding bead outward appearance, adopts synthetic fluormica as at least a portion in fluorine source.
Prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2006-95550 communique
Patent documentation 2: TOHKEMY 2013-18031 communique
Patent documentation 3: TOHKEMY 2011-62745 communique
But described existing flux-cored wire, in the fillet welding of primer painting steel, can not meet whole characteristics.For example,, in the flux-cored wire described in patent documentation 1, as the ZrO of principal component 2be high-melting-point, full-bodied oxide, be therefore difficult to regulate welding slag viscosity, optimum field is narrow.In addition, according to section morphology, due to the solder flux moisture absorption in manufacturing, in keeping or in using, also there is easily deteriorated problem of gasproof permeability in this flux-cored wire.
On the other hand, in the flux-cored wire described in patent documentation 2, by limiting TiO 2, SiO 2, ZrO 2recently realize and improve gasproof permeability with Mn/Si, but can not say abundant about the performance beyond gasproof permeability.In addition, the flux-cored wire described in patent documentation 3 is owing to defining Na amount, K amount and F amount, although reached target effect, deteriorated to be improved for the removability of slag of the stability of electric arc and generation thereupon.
Summary of the invention
Therefore, the object of the present invention is to provide in fillet welding welding operation excellent, gasproof permeability, weld bead shape and the removability of slag be good flux-cored wire for gas-shielded arc welding all.
Flux-cored wire for gas-shielded arc welding for fillet welding of the present invention, it is the flux-cored wire for gas-shielded arc welding that intracutaneous has been filled solder flux outside steel, and be used to fillet welding, in welding wire gross mass, contain: Ti and Ti compound (Ti scaled value): 1.0～4.0 quality %, Si and Si compound (Si scaled value): 0.5～2.5 quality %, Zr and Zr compound (Zr scaled value): 0.1～0.6 quality %, Mn:2.0～3.0 quality %, C:0.02～0.10 quality %, S:0.005～0.030 quality %, Bi and Bi compound (Bi scaled value): 0.005～0.040 quality %, Na compound (Na scaled value): 0.01～0.20 quality %, K compound (K scaled value): 0.01～0.20 quality %, F compound (F scaled value): 0.01～0.20 quality %, Al and Al compound (Al scaled value): 0.05～0.50 quality %, Mg and Mg compound (Mg scaled value): 0.05～0.50 quality %, and, if Na compounds content (Na scaled value) is ［ Na ］, K compounds content (K scaled value) is ［ K ］, F compounds content (F scaled value) is ［ F ］, the total content of Si and Si compound (Si scaled value) is ［ Si ］, the total content of Bi and Bi compound (Bi scaled value) is ［ Bi ］, when S content is ［ S ］, meet following formula 1～3.
Formula 1
[ Na ] + [ K ] [ F ] ≤ 15
Formula 2
0.3 ≤ [ Na ] [ K ] ≤ 4.0
Formula 3
10 ≤ [ Si ] [ Bi ] + [ S ] ≤ 110
Flux-cored wire for gas-shielded arc welding of the present invention also can contain B and the B compound (B scaled value) below 0.0090 quality % in welding wire gross mass.
In addition, flux-cored wire for gas-shielded arc welding of the present invention is used to for example horizontal fillet welding of mild steel, high tension steel or low-alloy steel.
Also have, the amount of each composition containing in flux-cored wire can be measured respectively by the following method, C and S utilize burning-infrared absorption determining, Ti, Si, Zr, Mn, Al, Mg and B utilize ICP emission spectroanalysis method to measure, Bi, Na and K utilize atomic absorption analysis method to measure, and F utilizes neutralization titration to measure.
According to the present invention, can realize in fillet welding welding operation excellent, gasproof permeability, weld bead shape and the removability of slag be good flux-cored wire all.
The specific embodiment
As mentioned above, ZrO 2be difficult to regulate welding slag viscosity, there is the narrow tendency in optimum field.Therefore, present inventor take that to realize gasproof permeability, weld bead shape, the good gas shield electric arc fillet welding flux-cored wire of the removability of slag be target, to more easily to regulate the TiO of welding slag viscosity 2for the slag forming agent of main body, concentrate on studies, find optimum composition range.But, although all elements are optimum range, the also accidental example that can not obtain target property.
Therefore, present inventor further concentrates on studies repeatedly, finds the stabilisation for gasproof permeability and weld bead shape, and it is effective regulating the viscosity in slag and molten bath.And, be conceived to as Na, K, F, Si, Bi and the S of element that effectively adjusts the viscosity in slag and molten bath, found by the Na amount during welding wire is all, K amount and F amount and balance thereof, and Si amount, Bi amount and S amount and balance thereof be limited in particular range, can access target property.
Below, to being elaborated for implementing mode of the present invention.The flux-cored wire of present embodiment is filled with solder flux and forms in steel crust, and its external diameter is for example 0.9～2.0mm.In addition, so long as each composition is in scope of the present invention in welding wire, solder flux filling rate can be set as being worth arbitrarily, but the viewpoint of operability (feeding etc.) during from the stringiness of welding wire and welding, solder flux filling rate is preferably 10～20 quality % of welding wire gross mass.
The flux-cored wire of present embodiment contains Ti and Ti compound (Ti scaled value) in welding wire gross mass: 1.0～4.0 quality %, Si and Si compound (Si scaled value): 0.5～2.5 quality %, Zr and Zr compound (Zr scaled value): 0.1～0.6 quality %, Mn:2.0～3.0 quality %, C:0.02～0.10 quality %, S:0.005～0.030 quality %, Bi and Bi compound (Bi scaled value): 0.005～0.040 quality %, Na compound (Na scaled value): 0.01～0.20 quality %, K compound (K scaled value): 0.01～0.20 quality %, F compound (F scaled value): 0.01～0.20 quality %, Al and Al compound (Al scaled value): 0.05～0.50 quality %, Mg and Mg compound (Mg scaled value): 0.05～0.50 quality %.
In addition, the flux-cored wire of present embodiment, establishing Na compounds content (Na scaled value) for ［ Na ］, K compounds content (K scaled value) is ［ K ］, F compounds content (F scaled value) is ［ F ］, and the total content of Si and Si compound (Si scaled value) is ［ Si ］, and the total content of Bi and Bi compound (Bi scaled value) is ［ Bi ］, when S content is ［ S ］, meet following formula 4～6.And the flux-cored wire of present embodiment is used to the fillet welding of being undertaken by gas shielded arc welding.
Formula 4
[ Na ] + [ K ] [ F ] ≤ 15
Formula 5
0.3 ≤ [ Na ] [ K ] ≤ 4.0
Formula 6
10 ≤ [ Si ] [ Bi ] + [ S ] ≤ 110
Then, the numerical definiteness reason of each composition containing in the flux-cored wire of present embodiment is described.
［ Ti and Ti compound (Ti scaled value): 1.0～4.0 quality % ］
Ti adds with the form of the compounds such as the form of metal or alloy and oxide or intermetallic compound.In addition, the concrete example as the Ti source in the flux-cored wire of present embodiment, can exemplify metal Ti, Fe-Ti, TiO 2, FeTiO 3, BaTiO 3deng.
The Ti adding with the form of metal or alloy, because deoxidation generates TiO 2.TiO 2deng Ti oxide, as slag forming agent, play a role, if but the total content of Ti and Ti compound is less than 1.0 quality %, and this effect is insufficient, and welding slag foreskin and the removability of slag reduce, weld bead shape and welding bead appearance degradation.On the other hand, if the total content of Ti and Ti compound surpasses 4.0 quality %, welding slag forms thickness surplus, and gasproof permeability is deteriorated.Therefore, the total content of Ti and Ti compound is scaled 1.0～4.0 quality % by Ti.
The total content of Ti and Ti compound is from improving the viewpoint as slag forming agent effect, preferably more than 1.3 quality %, more preferably more than 1.5 quality %.On the other hand, from improving the viewpoint of gasproof permeability, the total content of Ti and Ti compound is preferably below 3.0 quality %, more preferably below 2.5 quality %.
［ Si and Si compound (Si scaled value): 0.5～2.5 quality % ］
Si also adds with the form of metal, alloy or various compounds, as the concrete example in the Si source in the flux-cored wire of present embodiment, can exemplify Fe-Si, Fe-Si-Mn, Fe-Si-Mg, REM-Ca-Si, Fe-Si-B, the SiO containing in the Si that contains in steel crust, solder flux 2, ZrSiO 3, K 2siF 6and MgSiO 3deng.
The Si adding with compound form is reduced with the redox reaction of motlten metal at slag interface, in motlten metal, as metal Si, exists.This metal Si has the effect of the viscosity that improves molten bath.On the other hand, in slag, by deoxidation, generate and there is the SiO that increases mobility effect 2.
So, the Si composition in welding wire is in the welding of horizontal angle attitude, large on the impact of weld bead shape from two aspects of motlten metal and slag.Specifically, when the total content of Si and Si compound is less than 0.5 quality %, the viscosity in molten bath reduces, and on the other hand, due to the mobility reduction of slag, so weld bead shape becomes unstable.In addition, if the total content of Si and Si compound surpasses 2.5 quality %, the viscosity of motlten metal improves, and on the other hand, due to the mobility increase of slag, so weld bead shape becomes projection welding road.Therefore, the total content of Si and Si compound is scaled 0.5～2.5 quality % with Si.
About the total content of Si and Si compound, from the viewpoint of the stabilisation of weld bead shape, more than being preferably 0.9 quality %, more preferably more than 1.1 quality %.On the other hand, the viewpoint of improving from weld bead shape, the total content of Si and Si compound is preferably below 2.0 quality %, more preferably below 1.6 quality %.
［ Zr and Zr compound (Zr scaled value): 0.1～0.6 quality % ］
Zr also adds with the form of metal, alloy or compound, as the concrete example in the Zr source in the flux-cored wire of present embodiment, can exemplify metallic Z r, Fe-Zr and ZrO 2deng.The Zr adding with metal or alloy form generates ZrO by deoxidation 2.And, ZrO 2deng Zr oxide, have in horizontal angle welding and improve the confluent effect of welding bead.
But when the total content of Zr and Zr compound is less than 0.1 quality %, the effect that amalgamation improves reduces.In addition, if the total content of Zr and Zr compound surpasses 0.6 quality %, the setting temperature of welding slag uprises, and the viscosity of welding slag also uprises, and therefore, the gas in weld metal is not discharged into the atmosphere and is enclosed in welding slag, and gasproof permeability is deteriorated.Therefore, the total content of Zr and Zr compound is scaled 0.1～0.6 quality % by Zr.
From improving the confluent viewpoint of welding bead, more than the total content of Zr and Zr compound is preferably 0.15 quality %, more preferably more than 0.2 quality %.On the other hand, from improving the viewpoint of gasproof permeability, the total content of Zr and Zr compound is preferably below 0.5 quality %, more preferably below 0.4 quality %.
［ Mn:2.0～3.0 quality % ］
Mn also has the deoxidation of promotion weld metal and improves the toughness of weld metal and the effect of intensity.But, if Mn content is less than 2.0 quality %, this DeGrain, intensity and the toughness of weld metal are deteriorated.In addition, if Mn content surpasses 3.0 quality %, intensity is higher than required, and toughness is deteriorated.Therefore, Mn content is set as 2.0～3.0 quality %.From improving the intensity of weld metal and the viewpoint of toughness, more than Mn content is preferably 2.2 quality %, in addition, from the intensity of weld metal and the viewpoint of tough sexual balance, be preferably below 2.8 quality %.
［ C:0.02～0.10 quality % ］
C has the effect of the intensity that improves weld metal.But when C content is less than 0.02 quality %, this effect is insufficient, the undercapacity of weld metal, and toughness is also deteriorated.On the other hand, if C content surpasses 0.10 quality %, electric arc is too concentrated, and undercut easily occurs.Therefore, C content is 0.02～0.10 quality %.From improving the intensity of weld metal and the viewpoint of toughness, more than C content is preferably 0.03 quality %, in addition, from suppressing the viewpoint of undercut, be preferably below 0.08 quality %.
［ S:0.005～0.030 quality % ］
S is owing to making the toughness drop of weld metal, therefore always processed as reducing the constraint element of its content.And present inventor has found that S is to the viscosity in molten bath and the very effective element of capillary adjusting.Therefore, in the flux-cored wire of present embodiment, in order to reduce the viscosity in molten bath, the air release producing while promoting welding, and optimize the fusion of welding bead not-go-end portion and actively add S.
But when S content is less than 0.005 quality %, the viscosity in molten bath uprises, gasproof permeability is deteriorated, and the amalgamation of welding bead also reduces.In addition, if S content surpasses 0.030 quality %, the toughness drop of weld metal.Therefore, S content is 0.005～0.030 quality %.From the viewpoint of gasproof permeability, more than S content is preferably 0.008 quality %, more preferably greater than 0.010 quality %.On the other hand, from guaranteeing the viewpoint of the toughness of weld metal, S content is preferably below 0.025 quality %.
［ Bi and Bi compound (Bi scaled value): 0.005～0.040 quality % ］
Bi also adds with the form of metal, alloy or compound, as the concrete example in the Bi source in the flux-cored wire of present embodiment, can exemplify metal Bi and Bi 2o 3deng.Bi and Bi compound are that it is also effective element that the viscosity in molten bath is regulated except improving the effect of the removability of slag.In addition, in B and Bi compound, there is equally with above-mentioned S the effect that promotes the air release of generation when welding.
But when the total content of Bi and Bi compound is less than 0.005 quality %, the viscosity in molten bath uprises, gasproof permeability is deteriorated.In addition, if the total content of Bi and Bi compound surpasses 0.040 quality %, the toughness drop of weld metal.Therefore, the total content of Bi and Bi compound is scaled 0.005～0.040 quality % with Bi.
From the viewpoint of gasproof permeability, the total content of Bi and Bi compound is preferably more than 0.008 quality %, more preferably more than 0.012 quality %.In addition, from guaranteeing the viewpoint of the toughness of weld metal, the total content of Bi and Bi compound is preferably below 0.030 quality %.
［ Na compound (Na scaled value): 0.01～0.20 quality % ］
Concrete example as the Na compound in the flux-cored wire of present embodiment can exemplify NaF, Na 2o and Na 2cO 3deng.Na has the effect of stable arc.In addition, Na also has and reduces the viscosity of slag and the effect of fusing point, is the effective element that the gas that produces when making to weld is discharged into the atmosphere by slag.
But if Na compounds content is less than 0.01 quality %, the viscosity of melting welding slag uprises, gasproof permeability is deteriorated.In addition, if Na compounds content surpasses 0.20 quality %, resistance to hygroscopicity reduces, and gasproof permeability is deteriorated.Therefore, Na compounds content is scaled 0.01～0.20 quality % with Na.From the viewpoint of the viscosity of melting welding slag, more than Na compounds content is preferably 0.03 quality %, more preferably more than 0.06 quality %.In addition, from resistance to hygroscopic viewpoint, Na content is preferably below 0.18 quality %, more preferably below 0.16 quality %.
［ K compound (K scaled value): 0.01～0.20 quality % ］
Concrete example as the K compound in the flux-cored wire of present embodiment can be enumerated K 2o, KF and K 2siF 6deng.K also has equally the effect of stable arc and reduces the viscosity of slag and the effect of fusing point with Na.
But if K compounds content is less than 0.01 quality %, the viscosity of slag uprises, gasproof permeability is deteriorated.In addition, if K compounds content surpasses 0.20 quality %, resistance to hygroscopicity reduces, and gasproof permeability is deteriorated.Therefore, K compounds content is scaled 0.01～0.20 quality % with K.From the viewpoint of the viscosity of slag, more than K content is preferably 0.03 quality %, more preferably more than 0.06 quality %.In addition, from resistance to hygroscopic viewpoint, K content is preferably below 0.18 quality %, more preferably below 0.16 quality %.
［ F compound (F scaled value): 0.01～0.20 quality % ］
Concrete example as the F compound in the flux-cored wire of present embodiment can exemplify CaF 2, BaF 2, NaF, K 2siF 6, SrF 2, AlF 3, MgF 2with LiF etc.F and Na or K have the effect of the viscosity that reduces slag equally.In addition, F also has while welding and H bonding forms HF, reduces the effect of the moisture in motlten metal, is to the very effective composition of the raising of gasproof permeability.
But, when F compounds content is less than 0.01 quality %, can not obtain above-mentioned effect, gasproof permeability is deteriorated.In addition, if F compounds content surpasses 0.20 quality %, the viscosity of slag work reduces, and the welding slag foreskin of upper foot reduces, and weld bead shape is deteriorated, and the removability of slag is also deteriorated.Therefore, F compounds content is scaled 0.01～0.20 quality % with F.
From the viewpoint of gasproof permeability, more than F content is preferably 0.02 quality %, more preferably more than 0.05 quality %.In addition, from the viewpoint of the viscosity of slag, F content is preferably below 0.18 quality %, more preferably below 0.16 quality %.
［ Al and Al compound (Al scaled value): 0.05～0.50 quality % ］
Al adds with the form of the compounds such as the form of metal or alloy and oxide or intermetallic compound.As the concrete example in the Al source in the flux-cored wire of present embodiment, can exemplify metal A l, Fe-Al, Al-Mg, the Al containing in the metal A l that contains in steel crust, solder flux 2o 3and AlF 3deng.
Al adds as powerful deoxidier mainly with the form of metal or alloy, by deoxidation, generates Al 2o 3.And, Al 2o 3the effect Deng Al oxide with the freezing point rising that makes welding slag.But, when the total content of Al and Al compound is less than 0.05 quality %, have the tendency of the amalgamation reduction of welding bead not-go-end portion.In addition, if the total content of Al and Al compound surpasses 0.50 quality %, there is the freezing point of welding slag to uprise, the tendency that gasproof permeability is deteriorated.Therefore, the total content of Al and Al compound is scaled 0.05～0.50 quality % with Al.
From the confluent viewpoint of welding welding bead not-go-end portion, more than the total content of Al and Al compound is preferably 0.10 quality %, more preferably more than 0.15 quality %.In addition, from the viewpoint of the freezing point of welding slag, the total content of Al and Al compound is preferably below 0.45 quality %, more preferably below 0.40 quality %.
［ Mg and Mg compound (Mg scaled value): 0.05～0.50 quality % ］
Mg also adds with the form of metal, alloy or compound, as the concrete example in the Mg source in the flux-cored wire of present embodiment, can exemplify metal M g, Al-Mg, Fe-Si-Mg, Ni-Mg, MgO, MgCO 3, MgSiO 3and MgF 2deng.Mg adds as powerful deoxidier mainly with the form of metal or alloy, by deoxidation, generates MgO.And the Mg oxides such as MgO have the effect of the freezing point rising that makes welding slag.
But, when the total content of Mg and Mg compound is less than 0.05 quality %, have the tendency of the amalgamation reduction of welding bead not-go-end portion.In addition, if the total content of Mg and Mg compound surpasses 0.50 quality %, the freezing point of welding slag uprises, and has the deteriorated tendency of gasproof permeability.Therefore, the total content of Mg and Mg compound is scaled 0.05～0.50 quality % with Mg.
From the confluent viewpoint of welding bead not-go-end portion, more than the total content of Mg and Mg compound is preferably 0.10 quality %, more preferably more than 0.15 quality %.In addition, from the viewpoint of the freezing point of welding slag, the total content of Mg and Mg compound is preferably below 0.45 quality %, more preferably below 0.40 quality %.
［ (［ Na ］+［ K ］)/［ F ］: below 15 ］
As mentioned above, for Na, K and F, there is the viscosity that reduces melting welding slag, improve the effect of gasproof permeability.And if Na and K excessively add, likely can make resistance to hygroscopicity deteriorated.On the other hand, F has the effect that reduces the moisture in motlten metal, is to the very effective composition of the raising of gasproof permeability.
Therefore, inventor makes further research the content of Na compound, K compound and F compound, finds that it is effective that the ratio of the total content of Na compound and K compound (［ Na ］+［ K ］) and F compounds content (［ F ］) is set as to specific scope.Found the total amount with respect to Na compound and K compound, by appropriate interpolation F compound, by the deteriorated tendency of the resistance to hygroscopicity due to Na and K add, can be reduced effect by the moisture in the motlten metal by due to F adds and be suppressed, can obtain the gasproof permeability energy of target.
At this, if (［ Na ］+［ K ］)/［ F ］ surpasses 15,, with respect to the total amount of Na compound and K compound, because F compound is not enough, gasproof permeability is deteriorated.Therefore, (［ Na ］+［ K ］)/［ F ］ is below 15.The viewpoint improving from gasproof permeability, (［ Na ］+［ K ］)/［ F ］ is preferably below 12, more preferably below 10.
［［Na］/［K］：0.3～4.0］
As mentioned above, Na and K have the effect of stable arc, but effect is separately different, and Na concentrates and stabilisation electric arc, and K makes electric arc expansion and makes its stabilisation.Present inventor is conceived to this arc characteristic and concentrates on studies, found that, ratio (=［ Na ］/［ K ］) by specific Na compounds content (Na scaled value) and K compounds content (K scaled value) can further be optimized arc characteristic, improves weld bead shape and the removability of slag.
But ［ Na ］/［ K ］ is less than at 0.3 o'clock, electric arc is too expanded, and undercut easily occurs, and the removability of slag is deteriorated.In addition, if ［ Na ］/［ K ］ surpasses 4.0, electric arc is too concentrated, and it is protruding that weld bead shape becomes.Therefore, ［ Na ］/［ K ］ is 0.3～4.0.The viewpoint improving from the removability of slag, ［ Na ］/［ K ］ is preferably more than 0.5, more preferably more than 0.8.In addition, from the viewpoint of weld bead shape, ［ Na ］/［ K ］ is preferably below 3.5, more preferably below 3.0.
［［Si］/（［Bi］＋［S］）：10～110］
As mentioned above, Si, Bi and S are to regulating the effective element of viscosity in molten bath, but its effect is different, and Si improves the viscosity in molten bath, and Bi and S reduce the viscosity in molten bath.Present inventor, by concentrating on studies, found that, in order to ensure target property, and Si, the balance of Bi and S is very important.
(=［ Si ］/(［ Bi ］+［ S ］) is less than at 10 o'clock to the ratio of the total content of Si and Si compound (Si scaled value) and Bi and the total content (Bi scaled value) of Bi compound and the total of S content, the viscosity of fusion pool becomes too low, and it is unstable that weld bead shape becomes.On the other hand, if ［ Si ］/(［ Bi ］+［ S ］) surpasses 110, the viscosity of fusion pool becomes too high, and the gas producing during welding can not discharge well, and gasproof permeability is deteriorated.Therefore, ［ Si ］/(［ Bi ］+［ S ］) is 10～110.
From the viewpoint of the stabilisation of weld bead shape, ［ Si ］/(［ Bi ］+［ S ］) is preferably more than 20, more preferably more than 25.In addition, from the viewpoint of gasproof permeability, ［ Si ］/(［ Bi ］+［ S ］) is preferably below 85, more preferably below 50.
［ B and B compound (B scaled value): 0.0090 quality % is following ］
The flux-cored wire of present embodiment as required, can add B(metal or alloy except above-mentioned each composition) and/or B compound.B and B compound become B more 2o 3and play a role as slag forming agent, a part remains in weld metal, and the toughness of weld metal is improved.But if the total content of B and B compound surpasses 0.0090 quality %, the intensity of weld metal uprises, toughness is deteriorated.While therefore, adding B and B compound with B scaled value preferably below 0.0090 quality %.
While adding B and B compound, from the viewpoint of the toughness of weld metal, preferably these total content is more than 0.0010 quality %, in addition, is preferably below 0.0070 quality %.
［ surplus ］
Surplus during the one-tenth of the flux-cored wire of present embodiment is grouped into is the inevitably impurity such as the alloying constituents such as Fe and Ni, Mo, Cu, Cr, Ca, Nb, V, Li and its compound, P, Sb, As.Also have, each above-mentioned element during as oxide or nitride doping, also contains O or N in the surplus of the flux-cored wire of present embodiment.
［ manufacture method ］
When manufacturing the flux-cored wire of present embodiment, first, intracutaneous filling flux outside steel.Now, crust is preferably used mild steel or the low-alloy steel that wire-drawing workability is good.In addition, the composition of solder flux and filling rate can become the composition of crust of above-mentioned scope and thickness etc. according to all compositions of welding wire and suitably regulate.Also have, the viewpoint of the operability (feeding etc.) during from the stringiness of welding wire and welding, the filling rate of solder flux is preferably 10～20 quality % of welding wire gross mass.
Then, the welding wire that adopts casement or roller die to be filled with solder flux to intracutaneous outside carries out wire drawing, carries out thus footpath contracting, obtains the flux-cored wire that for example external diameter is 0.9～2.0mm.
As described in detail above, the flux-cored wire of present embodiment is except becoming to be grouped into, and specific Na amount, K amount and F amount and balance thereof, and Si amount, Bi amount and S amount and balance thereof, therefore make welding operation stabilisation, and can make weld bead shape and the removability of slag good.
Embodiment
Below, exemplify embodiments of the invention and comparative example effect of the present invention is specifically described.In the present embodiment, filling flux in the tubulose crust forming at the mild steel by composition shown in following table 1 (diameter 1.4mm), the flux-cored wire of making embodiment and comparative example.Now, make the filling rate of solder flux with welding wire gross mass, count the scope of 10～20 quality %.
[table 1]
Then, use each flux-cored wire of embodiment and comparative example to carry out gas shielded arc welding to the mother metal forming shown in following table 2.Now, on mother metal surface, implemented in advance application (priming paint principal component: Zn, priming paint thickness 30 μ m).In addition, use CO 2(100%) as protective gas.
[table 2]
And, by method as follows, to using the gas arc welding of each flux-cored wire of embodiment and comparative example, carry out the evaluation of engineering properties of gasproof permeability, welding bead outward appearance and the weld part of weld part.
< gasproof permeability >
The evaluation of gasproof permeability is carried out as follows, uses 2 tabular mother metals as breadboard, erects another piece sheet material on a sheet material, uses each flux-cored wire of embodiment and comparative example, and across corner is carried out horizontal fillet welding.Now, welding condition is welding current value 300～310A(DC-EP), speed of welding 70mm/ minute, 45 ° of welding torch angles, 0 ° of front receding angle, the long 5mm of target pin.And with the same terms, soldering test plate 600mm is long respectively for 2 groups of breadboards.
Evaluation is the generation quantity that is determined at the weld defects such as the pit that produces on transverse slat side weld part or channeling, flawless situation is fabulous (◎+), defect is that the situation of 1 is very good (◎), defect number is that the situation of 2～3 is good (zero), and 4 of defects count are bad (*) above.< weld bead shape outward appearance >
The evaluation of weld bead shape outward appearance is weld part, the fusion of visual evaluation weld toe and the convex degree of eye-level fillet welding in above-mentioned gasproof permeability is evaluated.Now, from the good knitting of weld toe and and convex degree little, by fabulous (◎+), very good (◎), well (zero), bad (*) 4 level evaluations.In addition, about undercut press below 0.2mm for fabulous (◎+), surpass 0.2mm 0.3mm be very good (◎), surpass 0.3mm is well (zero) below 0.4mm, what surpass 0.4mm is bad (*), a low final evaluation result of conduct in two judges.
The engineering properties > of < weld part
About the engineering properties of weld part, in the weld part of each flux-cored wire 6 Ceng12 roads welding downwards that uses embodiment and comparative example, carry out the impact test stipulated in JIS Z3111, according to its result, evaluate.Now, welding current value is 290～320A(DC-EP), between road, temperature is 150 ± 10 ℃.Its result is, the impact value in 0 ℃ of atmosphere temperature is more than 70J to be very good (◎), 47J above lower than 70J be good (zero), what be less than 47J is bad (*).
More than the results are shown in following table 3～7.Also have, the surplus of the component of weld wire shown in following table 3～7 be Fe, alloying constituent, inevitably impurity, come from the O of oxide and come from the N etc. of nitride.
[table 3]
[table 4]
[table 5]
[table 6]
[table 7]
In the welding wire of comparative example No.127 shown in above-mentioned table 7, because the content of Ti is less than 1.0 quality %, so welded pass visual shape is deteriorated.On the other hand, because the content of the Ti of the welding wire of comparative example No.128 surpasses 4.0 quality %, so gasproof permeability is deteriorated.In addition, the Si content of the welding wire of comparative example No.129 is less than 0.5 quality %, so welded pass visual shape is deteriorated.In addition, the Si content of the welding wire of comparative example No.130 surpasses 2.5 quality %, so welded pass visual shape is deteriorated.
The content of the Zr of the welding wire of comparative example No.131 is less than 0.10 quality %, so welded pass visual shape is deteriorated.On the other hand, the Zr content of the welding wire of comparative example No.132 surpasses 0.60 quality %, so gasproof permeability is deteriorated.The content of the Mn of the welding wire of comparative example No.133 is less than 2.0 quality %, so toughness is deteriorated.In addition, the Mn content of the welding wire of comparative example No.134 surpasses 3.0 quality %, so the toughness of weld metal is deteriorated.
The C content of the welding wire of comparative example No.135 is less than 0.02 quality %, so the toughness of weld metal is deteriorated.On the other hand, the C content of the welding wire of comparative example No.136 surpasses 0.10 quality %, so welded pass visual shape is deteriorated.The S content of the welding wire of comparative example No137 is less than 0.005 quality %, so gasproof permeability is deteriorated, and then welded pass visual shape is also deteriorated.In addition, the S content of the welding wire of comparative example No.138 surpasses 0.030 quality %, so the toughness of weld metal is deteriorated.
The Bi content of the welding wire of comparative example No.139 is less than 0.005 quality %, so gasproof permeability is deteriorated.On the other hand, the Bi content of the welding wire of comparative example No.140 surpasses 0.040 quality %, so the toughness of weld metal is deteriorated.The Na compounds content of the welding wire of comparative example No.141 is less than 0.01 quality %, so gasproof permeability is deteriorated.In addition, the Na compounds content of the welding wire of comparative example No.142 surpasses 0.20 quality %, so gasproof permeability is deteriorated.
The K compounds content of the welding wire of comparative example No.143 is less than 0.01 quality %, so gasproof permeability is deteriorated.In addition, the K compounds content of the welding wire of comparative example No.144 surpasses 0.20 quality %, so gasproof permeability is deteriorated.The F compounds content of the welding wire of comparative example No.145 is less than 0.01 quality %, so gasproof permeability is deteriorated.On the other hand, the F compounds content of the welding wire of comparative example No.146 surpasses 0.20 quality %, so welded pass visual shape is deteriorated.
The Al content of the welding wire of comparative example No.147 is less than 0.05 quality %, so welded pass visual shape is deteriorated.On the other hand, the Al content of the welding wire of comparative example No.148 surpasses 0.50 quality %, so gasproof permeability is deteriorated.The Mg content of the welding wire of comparative example No.149 is less than 0.05 quality %, so welded pass visual shape is deteriorated.In addition, the Mg content of the welding wire of comparative example No.150 surpasses 0.50 quality %, so gasproof permeability is deteriorated.
(［ Na ］+［ K ］)/［ F ］ of the welding wire of comparative example No.151 surpasses 15, so gasproof permeability is deteriorated.［ Na ］ of the welding wire of comparative example No.152/［ K ］ is less than 0.3, so welded pass visual shape is deteriorated.On the other hand, ［ Na ］ of the welding wire of comparative example No.153/［ K ］ surpasses 4.0, so welded pass visual shape is deteriorated.［ Si ］ of the welding wire of comparative example No.154/(［ Bi ］+［ S ］) is less than 10, so welded pass visual shape is deteriorated.In addition, ［ Si ］ of the welding wire of comparative example No.155/(［ Bi ］+［ S ］) surpasses 110, so gasproof permeability is deteriorated.
In the welding wire of comparative example No.156, added the B that surpasses 0.0090 quality %, so the toughness of weld metal is deteriorated.
On the other hand, the welding wire of embodiment No.1～126 shown in above-mentioned table 3～6 is the welding wires that meet scope of the present invention, so the engineering properties of gasproof permeability, weld bead shape outward appearance, weld part is good.From above result, can confirm: according to the present invention, can obtain all good flux-cored wire for gas-shielded arc welding of welded corner joint welding operation excellence, gasproof permeability, weld bead shape and the removability of slag.

Claims (3)

1. a flux-cored wire for gas-shielded arc welding; that intracutaneous is filled with the flux-cored wire for gas-shielded arc welding that solder flux forms outside steel; it is used to fillet welding, wherein, in welding wire gross mass, contains: Ti and Ti compound with Ti scaled value count 1.0～4.0 quality %,
Si and Si compound with Si scaled value count 0.5～2.5 quality %,
Zr and Zr compound with Zr scaled value count 0.1～0.6 quality %,
Mn:2.0～3.0 quality %,
C:0.02～0.10 quality %,
S:0.005～0.030 quality %,
Bi and Bi compound with Bi scaled value count 0.005～0.040 quality %,
Na compound with Na scaled value count 0.01～0.20 quality %,
K compound with K scaled value count 0.01～0.20 quality %,
F compound with F scaled value count 0.01～0.20 quality %,
Al and Al compound with Al scaled value count 0.05～0.50 quality %,
Mg and Mg compound are counted 0.05～0.50 quality % with Mg scaled value,
And, with Na scaled value, count ［ Na ］ establishing Na compounds content, K compounds content is counted ［ K ］ with K scaled value, F compounds content is counted ［ F ］ with F scaled value, the total content of Si and Si compound is counted ［ Si ］ with Si scaled value, and the total content of Bi and Bi compound is counted ［ Bi ］ with Bi scaled value, when S content is ［ S ］, meet following formula (I)～(III)
&lsqb; Na &rsqb; + &lsqb; K &rsqb; &lsqb; F &rsqb; &le; 15 - - - ( I )
0.3 &le; &lsqb; Na &rsqb; &lsqb; K &rsqb; &le; 4.0 - - - ( II )
10 &le; &lsqb; Si &rsqb; &lsqb; Bi &rsqb; + &lsqb; S &rsqb; &le; 110 - - - ( III ) .
2. flux-cored wire for gas-shielded arc welding according to claim 1, is characterized in that, in welding wire gross mass, contains with B scaled value and counts B and the B compound below 0.0090 quality %.
3. flux-cored wire for gas-shielded arc welding according to claim 1 and 2, is characterized in that, described flux-cored wire is used to the horizontal fillet welding of mild steel, high tension steel or low-alloy steel.
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JP2014184481A (en) 2014-10-02

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