CN110153593A - 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
CN110153593A
CN110153593A CN201910534785.3A CN201910534785A CN110153593A CN 110153593 A CN110153593 A CN 110153593A CN 201910534785 A CN201910534785 A CN 201910534785A CN 110153593 A CN110153593 A CN 110153593A
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Prior art keywords
mass
compound
welding
flux
scaled value
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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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    • 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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  • 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 present invention provides one kind and welds operational excellent, the good flux-cored wire for gas-shielded arc welding of resistance to gas porosity, weld bead shape and the removability of slag in welded corner joint.Flux-cored wire for gas-shielded arc welding contains mass %, Si:0.5 of Ti:1.0~4.0~2.5 mass %, Zr:0.1~0.6 mass %, Mn:2.0~3.0 mass %, C:0.02~0.10 mass %, S:0.005~0.030 mass %, Bi:0.005~0.040 mass %, Na:0.01~0.20 mass %, K:0.01~0.20 mass %, F:0.01~0.20 mass %, Al:0.05~0.50 mass %, Mg:0.05~0.50 mass % by relative to welding wire gross mass, while meeting public formula (I)~(III) ingredient.

Description

Flux-cored wire for gas-shielded arc welding
The application be the applying date be on December 19th, 2013, application No. is 201310704268.9, entitled " gases The divisional application of the application of shielded arc welding flux-cored wire ".
Technical field
The present invention relates to flux-cored wire for gas-shielded arc welding.More particularly, to the gas shield that can be used for fillet welding Arc welding flux-cored wire.
Background technique
Fillet welding is widely used in the fields such as ship and bridge.In addition, usually in the large structures such as ship and bridge In, during production in get rusty in order to prevent and using being coated with the primer painting steel an of antirusting paint.But the bottom of to When painting coated steel progress fillet welding, due to the influence of antirusting paint, the stomatas such as pit, channeling and bubble are easy to appear, in addition, by It is easy to become unstable in electric arc, to there are problems that weld bead shape and removability of slag deterioration.
The appearance of this stomata, the deterioration of weld bead shape and the removability of slag, due to incurring rework operation and except the increasing of slag operation Add, therefore has become the automation for realizing fillet welding and efficient big obstacle.Therefore, all the time, in order to improve the bottom of about It paints the characteristics such as resistance to gas porosity, weld bead shape and the removability of slag of fillet welding of coated steel and has proposed various schemes (referring for example to patent Document 1~3).
In the flux-cored wire described in patent document 1, by by ZrO2As slag forming agent main component, it is achieved in raising Resistance to stomata (resistance to pit) property.On the other hand, in the flux-cored wire described in patent document 2, for the painting thicker in priming paint film thickness It covers and obtains resistance to gas porosity in the horizontal fillet welding of priming paint steel plate, with TiO2As principal component, and by SiO2-ZrO2Amount is set as suitable When range.In addition, flux-cored wire described in patent document 3 is to improve resistance to gas porosity, and maintain good weld bead shape and Welding bead appearance, at least part using synthesis fluormica as Fluorine source.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 2006-95550 bulletin
Patent document 2: Japanese Unexamined Patent Publication 2013-18031 bulletin
Patent document 3: Japanese Unexamined Patent Publication 2011-62745 bulletin
But the existing flux-cored wire is not able to satisfy whole characteristics in the fillet welding of primer painting steel. For example, the ZrO in the flux-cored wire described in patent document 1, as principal component2It is high-melting-point, highly viscous oxide, therefore It is difficult to adjust welding slag viscosity, optimum field is narrow.In addition, the flux-cored wire is according to section morphology, due in manufacture, keeping In or use in solder flux moisture absorption, there is also resistance to gas porosity be easy deterioration the problem of.
On the other hand, in the flux-cored wire described in patent document 2, by limiting TiO2、SiO2、ZrO2Come with Mn/Si ratio It realizes and improves resistance to gas porosity, but can not say it is abundant about the performance other than resistance to gas porosity.In addition, described in patent document 3 Flux-cored wire is due to defining Na amount, K amount and F amount, although having reached target effect, stability for electric arc and therewith The deterioration of the removability of slag of generation is to be improved.
Summary of the invention
Therefore, excellent the purpose of the present invention is to provide operability is welded in fillet welding, resistance to gas porosity, weld bead shape and de- The good flux-cored wire for gas-shielded arc welding of slag.
Flux-cored wire for gas-shielded arc welding for fillet welding of the invention is intradermal outside steel to be filled with solder flux Flux-cored wire for gas-shielded arc welding, and it is used for fillet welding, contained in terms of welding wire gross mass: (the Ti conversion of Ti and Ti compound Value): 1.0~4.0 mass %, Si and Si compounds (Si scaled value): 0.5~2.5 mass %, Zr and Zr compound (Zr conversion Value): 0.1~0.6 mass %, Mn:2.0~3.0 mass %, C:0.02~0.10 mass %, S:0.005~0.030 mass %, Bi and Bi compound (Bi scaled value): 0.005~0.040 mass %, Na compound (Na scaled value): 0.01~0.20 matter Measure %, K compound (K scaled value): 0.01~0.20 mass %, F compound (F scaled value): 0.01~0.20 mass %, Al and Al compound (Al scaled value): 0.05~0.50 mass %, Mg and Mg compound (Mg scaled value): 0.05~0.50 mass %, Also, Na compounds content (Na scaled value) is set as [Na], K compounds content (K scaled value) is [K], and (F is changed F compounds content Calculation value) it is [F], the total content (Si scaled value) of Si and Si compound is [Si], total content (the Bi conversion of Bi and Bi compound Value) it is that [Bi] meets following formula 1~3 when S content is [S].
Formula 1
Formula 2
Formula 3
Flux-cored wire for gas-shielded arc welding of the invention can also contain 0.0090 mass % in terms of welding wire gross mass B and B compound (B scaled value) below.
In addition, flux-cored wire for gas-shielded arc welding of the invention is used for such as mild steel, high tension steel or low-alloy The horizontal fillet welding of steel.
In addition, the amount of each ingredient contained in flux-cored wire can measure respectively by the following method, C and S utilize burning- Infrared absorption determining, Ti, Si, Zr, Mn, Al, Mg and B are measured using ICP emission spectroanalysis method, and Bi, Na and K utilize original Sub- absorption approach measurement, F are measured using neutralization titration.
It is operational excellent that the welding in fillet welding may be implemented according to the present invention, resistance to gas porosity, weld bead shape and the removability of slag are equal Good flux-cored wire.
Specific embodiment
As described above, ZrO2It is difficult to adjust welding slag viscosity, with the narrow tendency in optimum field.Therefore, present inventor To realize the good gas shielded arc fillet welding flux-cored wire of resistance to gas porosity, weld bead shape, the removability of slag as target, to more to hold Easily adjust the TiO of welding slag viscosity2Based on slag forming agent concentrate on studies, find optimum composition range.But although All elements are optimum range, also the accidental example that cannot obtain target property.
Therefore, present inventor further concentrates on studies repeatedly, finds the stabilisation for resistance to gas porosity and weld bead shape, adjusts It is effective for saving the viscosity of slag and molten bath.Also, be conceived to the element of the viscosity as effective adjustment slag and molten bath Na, K, F, Si, Bi and S, it was found that by by welding wire entirety in Na amount, K amount and F amount and its balance and Si amount, Bi amount and S amount And its balance is limited in particular range, can obtain target property.
In the following, mode for carrying out the present invention is described in detail.The flux-cored wire of present embodiment is in steel Filled with made of solder flux in crust, outer diameter is, for example, 0.9~2.0mm.In addition, as long as each ingredient is the present invention in welding wire In the range of, then solder flux filling rate can be set as arbitrarily being worth, but when from the stringiness of welding wire and welding operability (into To property etc.) from the perspective of, solder flux filling rate is preferably 10~20 mass % of welding wire gross mass.
The flux-cored wire of present embodiment contains Ti and Ti compound (Ti scaled value) in terms of welding wire gross mass: 1.0~4.0 Quality %, Si and Si compound (Si scaled value): 0.5~2.5 mass %, Zr and Zr compound (Zr scaled value): 0.1~0.6 Quality %, Mn:2.0~3.0 mass %, C:0.02~0.10 mass %, S:0.005~0.030 mass %, Bi and Bi compound (Bi scaled value): 0.005~0.040 mass %, Na compound (Na scaled value): (K is changed 0.01~0.20 mass %, K compound Calculation value): 0.01~0.20 mass %, F compound (F scaled value): 0.01~0.20 mass %, Al and Al compound (Al conversion Value): 0.05~0.50 mass %, Mg and Mg compound (Mg scaled value): 0.05~0.50 mass %.
In addition, the flux-cored wire of present embodiment, is setting Na compounds content (Na scaled value) as [Na], K compound contains Measuring (K scaled value) is [K], and F compounds content (F scaled value) is [F], and the total content (Si scaled value) of Si and Si compound is [Si], the total content (Bi scaled value) of Bi and Bi compound are that [Bi] meets following formula 4~6 when S content is [S].Also, The flux-cored wire of present embodiment is used by the fillet welding of gas shielded arc welding progress.
Formula 4
Formula 5
Formula 6
Then, the numerical definiteness reason of each ingredient contained in the flux-cored wire of present embodiment is illustrated.
[Ti and Ti compound (Ti scaled value): 1.0~4.0 mass %]
Ti is in the form of metal or alloy and the form of the compounds such as oxide or intermetallic compound is added.In addition, As the concrete example in the source Ti in the flux-cored wire of present embodiment, metal Ti, Fe-Ti, TiO can be enumerated2、FeTiO3、 BaTiO3Deng.
The Ti added in the form of metal or alloy, since deoxidation generates TiO2。TiO2Equal Ti oxide is as slagging Agent plays a role, but if the total content of Ti and Ti compound is less than 1.0 mass %, then the effect is insufficient, welding slag foreskin It is reduced with the removability of slag, weld bead shape and welding bead appearance degradation.On the other hand, if the total content of Ti and Ti compound is more than 4.0 Quality %, then welding slag forms thickness surplus, resistance to gas porosity deterioration.Therefore, the total content of Ti and Ti compound is scaled 1.0 by Ti ~4.0 mass %.
The total content of Ti and Ti compound is from the viewpoint of improving as slag forming agent effect, preferably 1.3 mass % or more, More preferable 1.5 mass % or more.On the other hand, from the viewpoint of improving resistance to gas porosity, the total content of Ti and Ti compound is excellent 3.0 mass % are selected as hereinafter, more preferably 2.5 mass % or less.
[Si and Si compound (Si scaled value): 0.5~2.5 mass %]
Si is also added in the form of metal, alloy or various compounds, as the Si in the flux-cored wire of present embodiment Fe-Si, Fe-Si-Mn, Fe-Si-Mg, REM- that the concrete example in source can enumerate the Si contained in steel crust, contain in solder flux Ca-Si、Fe-Si-B、SiO2、ZrSiO3、K2SiF6And MgSiO3Deng.
It is reduced, is melting by the redox reaction with molten metal at slag interface with the Si that compound form adds Exist in metal as metal Si.Metal Si has the effect of improving the viscosity in molten bath.On the other hand, by de- in slag Oxygen effect, generating has the SiO for increasing mobility effect2。
In this way, the Si ingredient in welding wire is in the welding of horizontal angle posture, the butt welding in terms of the two of molten metal and slag The influence of road shape is big.Specifically, the viscosity in molten bath reduces, separately when the total content of Si and Si compound is less than 0.5 mass % On the one hand, since the mobility of slag reduces, weld bead shape becomes unstable.In addition, if Si and Si compound it is total Content is more than 2.5 mass %, then the viscosity of molten metal improves, on the other hand, since the mobility of slag increases, welding bead Shape becomes projection welding road.Therefore, the total content of Si and Si compound is scaled 0.5~2.5 mass % with Si.
About the total content of Si and Si compound, from the viewpoint of the stabilisation of weld bead shape, preferably 0.9 mass % More than, more preferably 1.1 mass % or more.On the other hand, from the viewpoint of weld bead shape improvement, Si and Si compound it is total Content is preferably 2.0 mass % hereinafter, more preferably 1.6 mass % or less.
[Zr and Zr compound (Zr scaled value): 0.1~0.6 mass %]
Zr is also added in the form of metal, alloy or compound, as the source Zr in the flux-cored wire of present embodiment Concrete example can enumerate metal Zr, Fe-Zr and ZrO2Deng.The Zr added in the form of metal or alloy is generated by deoxidation ZrO2.Also, ZrO2Equal Zr oxide, which has, improves the confluent effect of welding bead in horizontal angle welding.
But when the total content of Zr and Zr compound is less than 0.1 mass %, the effect that amalgamation improves is reduced.In addition, If the total content of Zr and Zr compound is more than 0.6 mass %, the setting temperature of welding slag is got higher, also, the viscosity of welding slag It gets higher, therefore, the gas in welding metal is not discharged into the atmosphere and is enclosed in welding slag, resistance to gas porosity deterioration.Therefore, Zr and The total content of Zr compound is scaled 0.1~0.6 mass % by Zr.
From the viewpoint of the amalgamation for improving welding bead, the total content of Zr and Zr compound be preferably 0.15 mass % with On, more preferably 0.2 mass % or more.On the other hand, from the viewpoint of improving resistance to gas porosity, Zr and Zr compound always contains Amount is preferably 0.5 mass % hereinafter, more preferably 0.4 mass % or less.
[mass of Mn:2.0~3.0 %]
Mn also has the effect of promoting the deoxidation of welding metal and improves the toughness and intensity of welding metal.But if Mn content is less than 2.0 mass %, then the effect is unobvious, intensity and the toughness deterioration of welding metal.In addition, if Mn content is super 3.0 mass % are crossed, then intensity is higher than required, toughness deterioration.Therefore, Mn content is set as 2.0~3.0 mass %.It is welded from improving From the perspective of connecing the intensity and toughness of metal, Mn content is preferably 2.2 mass % or more, in addition, from the intensity of welding metal From the perspective of tough sexual balance, preferably 2.8 mass % or less.
[mass of C:0.02~0.10 %]
C has the effect of improving the intensity of welding metal.But C content less than 0.02 mass % when, which does not fill Point, the intensity of welding metal is insufficient, also, toughness also deteriorates.On the other hand, if C content is more than 0.10 mass %, electric arc It excessively concentrates, is easy to happen undercut.Therefore, C content is 0.02~0.10 mass %.From the intensity and toughness for improving welding metal From the perspective of, C content is preferably 0.03 mass % or more, in addition, from the viewpoint of inhibiting undercut, preferably 0.08 matter Measure % or less.
[mass of S:0.005~0.030 %]
S is always processed as the constraint element for reducing its content due to reducing the toughness of welding metal.And The inventors have found that S is the very effective element of adjusting to the viscosity and surface tension in molten bath.Therefore, in present embodiment Flux-cored wire in, in order to reduce the viscosity in molten bath, promote the gas generated when welding release, and optimize welding bead not-go-end portion It merges and actively adds S.
But S content less than 0.005 mass % when, the viscosity in molten bath is got higher, the deterioration of resistance to gas porosity, also, welding bead melts Conjunction property also reduces.In addition, the toughness of welding metal reduces if S content is more than 0.030 mass %.Therefore, S content is 0.005~0.030 mass %.From the viewpoint of resistance to gas porosity, S content is preferably 0.008 mass % or more, more preferably greater than 0.010 mass %.On the other hand, from the viewpoint of the toughness for ensuring welding metal, S content be preferably 0.025 mass % with Under.
[Bi and Bi compound (Bi scaled value): 0.005~0.040 mass %]
Bi is also added in the form of metal, alloy or compound, as the source Bi in the flux-cored wire of present embodiment Concrete example can enumerate metal Bi and Bi2O3Deng.Bi and Bi compound is to glue other than improving the effect of the removability of slag to molten bath It is also effective element that degree, which is adjusted,.In addition, in B and Bi compound, it is same as above-mentioned S that there is the promotion generation in welding The effect of gas release.
But the total content of Bi and Bi compound less than 0.005 mass % when, the viscosity in molten bath is got higher, and resistance to gas porosity is bad Change.In addition, the toughness of welding metal reduces if the total content of Bi and Bi compound is more than 0.040 mass %.Therefore, Bi and The total content of Bi compound is scaled 0.005~0.040 mass % with Bi.
From the viewpoint of resistance to gas porosity, the total content of Bi and Bi compound preferably 0.008 mass % or more, more preferably 0.012 mass % or more.In addition, the total content of Bi and Bi compound is preferred from the viewpoint of the toughness for ensuring welding metal For 0.030 mass % or less.
[Na compound (Na scaled value): 0.01~0.20 mass %]
Concrete example as the Na compound in the flux-cored wire of present embodiment can enumerate NaF, Na2O and Na2CO3 Deng.Na has the effect of stablizing electric arc.In addition, Na also has the effect of the viscosity for reducing slag and fusing point, it is for making to weld When the effective element discharged into the atmosphere by slag of the gas that generates.
But if Na compounds content is less than 0.01 mass %, the viscosity for melting welding slag is got higher, and resistance to gas porosity is bad Change.In addition, resistance to hygroscopicity reduces if Na compounds content is more than 0.20 mass %, resistance to gas porosity deterioration.Therefore, Naization It closes object content and 0.01~0.20 mass % is scaled with Na.From the viewpoint of the viscosity of melting welding slag, Na compounds content is excellent It is selected as 0.03 mass % or more, more preferable 0.06 mass % or more.In addition, Na content is preferred from the viewpoint of resistance to hygroscopicity For 0.18 mass % hereinafter, more preferably 0.16 mass % or less.
[K compound (K scaled value): 0.01~0.20 mass %]
Concrete example as the K compound in the flux-cored wire of present embodiment can enumerate K2O, KF and K2SiF6Deng.K Also same as Na to have the effect of stablizing electric arc and reduce the viscosity of slag and the effect of fusing point.
But if K compounds content is less than 0.01 mass %, the viscosity of slag is got higher, resistance to gas porosity deterioration.Separately Outside, if K compounds content is more than 0.20 mass %, resistance to hygroscopicity is reduced, resistance to gas porosity deterioration.Therefore, K compounds content 0.01~0.20 mass % is scaled with K.From the viewpoint of the viscosity of slag, K content is preferably 0.03 mass % or more, more Preferably 0.06 mass % or more.In addition, K content is preferably 0.18 mass % hereinafter, more excellent from the viewpoint of resistance to hygroscopicity It is selected as 0.16 mass % or less.
[F compound (F scaled value): 0.01~0.20 mass %]
Concrete example as the F compound in the flux-cored wire of present embodiment can enumerate CaF2、BaF2、NaF、 K2SiF6、SrF2、AlF3、MgF2With LiF etc..The F viscosity for having the effect of reducing slag same as Na or K.In addition, F also has Bond together to form HF with H when welding, reduce the effect of the moisture in molten metal, be it is very effective to the raising of resistance to gas porosity at Point.
But F compounds content less than 0.01 mass % when, said effect cannot be obtained, resistance to gas porosity deterioration.In addition, If F compounds content is more than 0.20 mass %, the viscosity of slag writes and reduces, and the welding slag foreskin of upper foot reduces, welding bead Shape deterioration, also, the removability of slag also deteriorates.Therefore, F compounds content is scaled 0.01~0.20 mass % with F.
From the viewpoint of resistance to gas porosity, F content is preferably 0.02 mass % or more, more preferably 0.05 mass % with On.In addition, from the viewpoint of the viscosity of slag, F content be preferably 0.18 mass % hereinafter, more preferably 0.16 mass % with Under.
[Al and Al compound (Al scaled value): 0.05~0.50 mass %]
Al is in the form of metal or alloy and the form of the compounds such as oxide or intermetallic compound is added.As this The concrete example in the source Al in the flux-cored wire of embodiment can enumerate the metal Al contained in steel crust, contain in solder flux Metal Al, Fe-Al, Al-Mg, Al2O3And AlF3Deng.
Al is added mostly in the form of metal or alloy as the deoxidier of strength, generates Al by deoxidation2O3.And And Al2O3Equal Al oxide has the effect of making the freezing point of welding slag to rise.But the total content of Al and Al compound is less than When 0.05 mass %, have the tendency that the amalgamation in welding bead not-go-end portion reduces.In addition, if the total content of Al and Al compound is more than 0.50 mass %, then have the freezing point of welding slag to get higher, the tendency of resistance to gas porosity deterioration.Therefore, the total content of Al and Al compound 0.05~0.50 mass % is scaled with Al.
From the viewpoint of the amalgamation in welding welding bead not-go-end portion, the total content of Al and Al compound is preferably 0.10 matter Measure % or more, more preferably 0.15 mass % or more.In addition, from the viewpoint of the freezing point of welding slag, Al and Al compound Total content is preferably 0.45 mass % hereinafter, more preferably 0.40 mass % or less.
[Mg and Mg compound (Mg scaled value): 0.05~0.50 mass %]
Mg is also added in the form of metal, alloy or compound, as the source Mg in the flux-cored wire of present embodiment Concrete example can enumerate metal Mg, Al-Mg, Fe-Si-Mg, Ni-Mg, MgO, MgCO3、MgSiO3And MgF2Deng.Mg is mostly with metal Or the form of alloy as strength deoxidier and add, MgO is generated by deoxidation.Also, the Mg oxide such as MgO has The effect for increase the freezing point of welding slag.
But the total content of Mg and Mg compound less than 0.05 mass % when, have welding bead not-go-end portion amalgamation reduce Tendency.In addition, the freezing point of welding slag is got higher if the total content of Mg and Mg compound is more than 0.50 mass %, there is resistance to stomata Property deterioration tendency.Therefore, the total content of Mg and Mg compound is scaled 0.05~0.50 mass % with Mg.
From the viewpoint of the amalgamation in welding bead not-go-end portion, the total content of Mg and Mg compound be preferably 0.10 mass % with On, more preferably 0.15 mass % or more.In addition, from the viewpoint of the freezing point of welding slag, the total content of Mg and Mg compound Preferably 0.45 mass % is hereinafter, more preferably 0.40 mass % or less.
[([Na]+[K])/[F]: 15 or less]
There is the viscosity for reducing melting welding slag as described previously for Na, K and F, improve the effect of resistance to gas porosity.And if Na and K are excessively added, it is likely that resistance to hygroscopicity can be made to deteriorate.In contrast, F has the effect for reducing the moisture in molten metal Fruit is to the very effective ingredient of the raising of resistance to gas porosity.
Therefore, inventor makes further research the content of Na compound, K compound and F compound, finds Na It is effective that the ratio of the total content ([Na]+[K]) and F compounds content ([F]) of compound and K compound, which is set as specific range, 's.The total amount relative to Na compound and K compound is had found, by adding F compound in right amount, caused by Na and K is added Resistance to hygroscopicity deterioration tendency can by by F addition caused by molten metal in moisture reducing effect inhibit, can obtain To the gasproof pore performance of target.
Here, if ([Na]+[K])/[F] more than 15, relative to the total amount of Na compound and K compound, because of Fization It is insufficient to close object, so resistance to gas porosity deteriorates.Therefore, ([Na]+[K])/[F] is 15 or less.The viewpoint improved from resistance to gas porosity goes out Hair, ([Na]+[K])/[F] is preferably 12 hereinafter, more preferably 10 or less.
[[Na]/[K]: 0.3~4.0]
As described above, Na and K have the effect of stablizing electric arc, but respective effect is different, and Na makes electric arc concentrate and stablize Change, K makes electric arc extend and make its stabilisation.Present inventor is conceived to the arc characteristic and concentrates on studies, as a result, it has been found that, by specific The ratio (=[Na]/[K]) of Na compounds content (Na scaled value) and K compounds content (K scaled value) can advanced optimize electricity Arc property improves weld bead shape and the removability of slag.
But [Na]/[K] less than 0.3 when, electric arc excessively extends, and is easy to happen undercut, removability of slag deterioration.In addition, if [Na]/[K] is more than 4.0, then electric arc is excessively concentrated, and weld bead shape becomes convex.Therefore, [Na]/[K] is 0.3~4.0.From the removability of slag From the perspective of raising, [Na]/[K] is preferably 0.5 or more, and more preferably 0.8 or more.In addition, going out from the viewpoint of weld bead shape Hair, [Na]/[K] is preferably 3.5 hereinafter, more preferably 3.0 or less.
[[Si]/([Bi]+[S]): 10~110]
As described above, Si, Bi and S are the effective elements of viscosity to adjusting molten bath, but its effect is different, and Si improves molten bath Viscosity, Bi and S reduce the viscosity in molten bath.Present inventor by concentrating on studies, as a result, it has been found that, in order to ensure target property, Si, The balance of Bi and S is critically important.
The total content (Si scaled value) of Si and Si compound and the total content (Bi scaled value) of Bi and Bi compound and S content Total ratio (when=[Si]/([Bi]+[S]) is less than 10, the viscosity of fusion pool becomes too low, and weld bead shape becomes unstable. On the other hand, if [Si]/([Bi]+[S]) is more than 110, the viscosity of fusion pool becomes excessively high, and the gas that when welding generates cannot It discharges well, resistance to gas porosity deterioration.Therefore, [Si]/([Bi]+[S]) is 10~110.
From the viewpoint of the stabilisation of weld bead shape, [Si]/([Bi]+[S]) is preferably 20 or more, more preferably 25 with On.In addition, [Si]/([Bi]+[S]) is preferably 85 hereinafter, more preferably 50 or less from the viewpoint of resistance to gas porosity.
[B and B compound (B scaled value): 0.0090 mass % or less]
The flux-cored wire of present embodiment can add B (metal or alloy) as needed in addition to above-mentioned each ingredient And/or B compound.B and B compound becomes B more2O3And play a role as slag forming agent, a part remains in welding metal, Improve the toughness of welding metal.But if the total content of B and B compound is more than 0.0090 mass %, welding metal Intensity is got higher, toughness deterioration.Therefore, with B scaled value preferably 0.0090 mass % or less when adding B and B compound.
When adding B and B compound, from the viewpoint of the toughness of welding metal, preferably these total content is 0.0010 Quality % or more, additionally, it is preferred that being 0.0070 mass % or less.
[surplus]
The flux-cored wire of present embodiment is Fe and Ni, Mo, Cu, Cr, Ca, Nb, V, Li at the surplus in being grouped as Equal alloying constituents and the inevitable impurity such as its compound, P, Sb, As.In addition, above-mentioned each element is as oxide or nitridation When object adds, O or N is also contained in the surplus of the flux-cored wire of present embodiment.
[manufacturing method]
When manufacturing the flux-cored wire of present embodiment, firstly, the intradermal filling flux outside steel.At this point, crust is preferred Use the good mild steel of wire-drawing workability or low-alloy steel.In addition, the composition and filling rate of solder flux can be according to welding wire entirety Composition becomes the appropriate adjusting such as ingredient and thickness of the crust of above range.In addition, from behaviour when stringiness and the welding of welding wire From the perspective of the property made (feeding etc.), the filling rate of solder flux is preferably 10~20 mass % of welding wire gross mass.
Then, wire drawing is carried out to the welding wire filled with solder flux intradermal outside using casement or roller die, thus carries out diameter contracting, obtains The flux-cored wire for being 0.9~2.0mm to such as outer diameter.
As described in detail above, the flux-cored wire of present embodiment is in addition at being grouped as, specific Na amount, K amount and F amount and its Balance and Si amount, Bi amount and S amount and its balance, therefore make to weld operational stabilisation, and weld bead shape can be made and taken off Slag is good.
Embodiment
Effect of the invention is specifically described in the following, enumerating examples and comparative examples of the present invention.In the present embodiment In, the filling flux in the tubulose crust (diameter 1.4mm) that constitutes of mild steel of the ingredient shown in following table 1, production embodiment and The flux-cored wire of comparative example.At this point, the filling rate of solder flux is made to be calculated as the range of 10~20 mass % with welding wire gross mass.
[table 1]
Then, gas guarantor is carried out using base material of each flux-cored wire of embodiment and comparative example to composition shown in following table 2 Protect arc welding.At this point, implementing coating (priming paint principal component: Zn, 30 μm of priming paint film thickness) in advance on base material surface.In addition, making Use CO2(100%) it is used as protective gas.
[table 2]
Also, by method as follows, gas arc welding to each flux-cored wire for using embodiment and comparative example, into The evaluation of the engineering properties of the resistance to gas porosity of row weld part, welding bead appearance and weld part.
<resistance to gas porosity>
The evaluation of resistance to gas porosity carries out as follows, uses 2 plate base materials as breadboard, erects on one block of plate another Block plate, using each flux-cored wire of embodiment and comparative example, diagonal section carries out horizontal fillet welding.At this point, welding condition is welding 300~310A of current value (DC-EP), speed of welding 70mm/ minutes, 45 ° of welding torch angle, 0 ° of preceding receding angle, the long 5mm of target foot. Also, breadboard 600mm long is respectively welded with the same terms for 2 groups of breadboards.
Evaluation is to measure the generation quantity of the welding defects such as the pit generated on the weld part of transverse slat side or channeling, zero defect The case where be fabulous (◎+), defect is that 1 situation is very good (◎), and defect number is that 2~3 situations are good (o), the above are bad (×) for defects count 4.
<weld bead shape appearance>
The evaluation of weld bead shape appearance is the weld part that horizontal fillet welding is observed in above-mentioned resistance to gas porosity evaluation, vision Evaluate the fusion and convex degree of weld toe.At this point, from the good knitting of weld toe and with convex degree it is small, By fabulous (◎+), very good (◎), good (zero), bad (×) 4 level evaluations.In addition, pressing 0.2mm or less about undercut It is fabulous (◎+), in 0.3mm is very good (◎) more than 0.2mm, below in 0.4mm more than 0.3mm is good (zero), be bad (×) more than 0.4mm, two judge in low one be used as final evaluation result.
<engineering properties of weld part>
About the engineering properties of weld part, welded downwards using 6 layer 12 of each flux-cored wire of embodiment and comparative example Weld part in, carry out JIS Z 3111 specified in impact test, evaluated according to its result.At this point, welding current value For 290~320A (DC-EP), temperature is 150 ± 10 DEG C between road.As a result, the impact value in 0 DEG C of atmosphere temperature is 70J Above is very good (◎), and it is bad (×) less than 47J that 47J or more, which is good (zero) lower than 70J,.
Result above is shown in following Table 3~7.In addition, the surplus of component of weld wire shown in following Table 3~7 is Fe, closes Golden agent, inevitable impurity, the O from oxide and N from nitride etc..
[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, since the content of Ti is less than 1.0 mass %, weldering The deterioration of road face shaping.On the other hand, since the content of the Ti of the welding wire of comparative example No.128 is more than 4.0 mass %, Resistance to gas porosity deterioration.In addition, the Si content of the welding wire of comparative example No.129 is less than 0.5 mass %, therefore welded pass visual shape Deterioration.In addition, the Si content of the welding wire of comparative example No.130 is more than 2.5 mass %, therefore welded pass visual shape deteriorates.
The content of the Zr of the welding wire of comparative example No.131 is less than 0.10 mass %, therefore welded pass visual shape deteriorates.Separately On the one hand, the Zr content of the welding wire of comparative example No.132 is more than 0.60 mass %, therefore resistance to gas porosity deteriorates.Comparative example No.133 Welding wire Mn content less than 2.0 mass %, therefore toughness deteriorates.In addition, the Mn content of the welding wire of comparative example No.134 is super Cross 3.0 mass %, therefore the toughness deterioration of welding metal.
The C content of the welding wire of comparative example No.135 is less than 0.02 mass %, therefore the toughness of welding metal deteriorates.Another party Face, the C content of the welding wire of comparative example No.136 is more than 0.10 mass %, therefore welded pass visual shape deteriorates.Comparative example No137 Welding wire S content less than 0.005 mass %, therefore resistance to gas porosity deteriorates, and then welded pass visual shape also deteriorates.In addition, The S content of the welding wire of comparative example No.138 is more than 0.030 mass %, therefore the toughness of welding metal deteriorates.
The Bi content of the welding wire of comparative example No.139 is less than 0.005 mass %, therefore resistance to gas porosity deteriorates.On the other hand, The Bi content of the welding wire of comparative example No.140 is more than 0.040 mass %, therefore the toughness of welding metal deteriorates.Comparative example No.141 Welding wire Na compounds content less than 0.01 mass %, therefore resistance to gas porosity deteriorates.In addition, the welding wire of comparative example No.142 Na compounds content is more than 0.20 mass %, therefore resistance to gas porosity deteriorates.
The K compounds content of the welding wire of comparative example No.143 is less than 0.01 mass %, therefore resistance to gas porosity deteriorates.In addition, The K compounds content of the welding wire of comparative example No.144 is more than 0.20 mass %, therefore resistance to gas porosity deteriorates.Comparative example No.145's The F compounds content of welding wire is less than 0.01 mass %, therefore resistance to gas porosity deteriorates.On the other hand, the welding wire of comparative example No.146 F compounds content be more than 0.20 mass %, therefore welded pass visual shape deteriorates.
The Al content of the welding wire of comparative example No.147 is less than 0.05 mass %, therefore welded pass visual shape deteriorates.It is another Aspect, the Al content of the welding wire of comparative example No.148 is more than 0.50 mass %, therefore resistance to gas porosity deteriorates.Comparative example No.149's The Mg content of welding wire is less than 0.05 mass %, therefore welded pass visual shape deteriorates.In addition, the Mg of the welding wire of comparative example No.150 Content is more than 0.50 mass %, therefore resistance to gas porosity deteriorates.
([Na]+[K])/[F] of the welding wire of comparative example No.151 is more than 15, therefore resistance to gas porosity deteriorates.Comparative example [Na] of the welding wire of No.152/[K] is less than 0.3, therefore welded pass visual shape deteriorates.On the other hand, comparative example No.153 [Na] of welding wire/[K] is more than 4.0, therefore welded pass visual shape deteriorates.[Si] of the welding wire of comparative example No.154/([Bi]+ [S]) less than 10, therefore welded pass visual shape deteriorates.In addition, [Si] of the welding wire of comparative example No.155/([Bi]+[S]) is super 110 are crossed, therefore resistance to gas porosity deteriorates.
The B more than 0.0090 mass %, therefore the toughness deterioration of welding metal are added in the welding wire of comparative example No.156.
In contrast, the welding wire of embodiment No.1~126 shown in above-mentioned table 3~6 is the weldering for meeting the scope of the present invention Silk, therefore resistance to gas porosity, weld bead shape appearance, the engineering properties of weld part are good.It can be confirmed that from result above according to this hair Bright available excellent, the resistance to gas porosity of welding operability, weld bead shape and the good gas shield of the removability of slag in welded corner joint Arc welding flux-cored wire.

Claims (3)

1. a kind of flux-cored wire for gas-shielded arc welding is intradermal filled with gas shielded arc made of solder flux outside steel Weldering flux-cored wire, be used for fillet welding, wherein contain in terms of welding wire gross mass: Ti and Ti compound is calculated as with Ti scaled value 1.0~4.0 mass %,
Si and Si compound with Si scaled value be calculated as 0.5~2.5 mass %,
Zr and Zr compound with Zr scaled value be calculated as 0.1~0.30 mass %,
The mass of Mn:2.0~3.0 %,
The mass of C:0.02~0.10 %,
The mass of S:0.005~0.030 %,
Bi and Bi compound with Bi scaled value be calculated as 0.005~0.040 mass %,
Na compound with Na scaled value be calculated as 0.01~0.20 mass %,
K compound with K scaled value be calculated as 0.01~0.20 mass %,
F compound with F scaled value be calculated as 0.01~0.20 mass %,
Al and Al compound with Al scaled value be calculated as 0.05~0.50 mass %,
Mg and Mg compound is calculated as 0.05~0.50 mass % with Mg scaled value,
Also, it is calculated as [Na] setting Na compounds content with Na scaled value, K compounds content is calculated as [K] with K scaled value, F chemical combination Object content is calculated as [F] with F scaled value, and the total content of Si and Si compound is calculated as [Si] with Si scaled value, Bi and Bi compound Total content is calculated as [Bi] with Bi scaled value, when S content is [S], meets following public affairs formula (I)~(III),
2. flux-cored wire for gas-shielded arc welding according to claim 1, which is characterized in that contained in terms of welding wire gross mass Have and 0.0090 mass % B and B compound below is calculated as with B scaled value.
3. flux-cored wire for gas-shielded arc welding according to claim 1 or 2, which is characterized in that the flux-cored wire It is used for the horizontal fillet welding of mild steel, high tension steel or low-alloy steel.
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CN102554497A (en) * 2010-12-21 2012-07-11 中冶建筑研究总院有限公司 Flux-cored wire for fine-grain high-strength steel bar CO2 arc welding
JP2012218065A (en) * 2011-04-13 2012-11-12 Nippon Steel & Sumikin Welding Co Ltd Flux-cored wire for two-electrode horizontal fillet co2 gas-shielded arc welding
JP2013018031A (en) * 2011-07-12 2013-01-31 Nippon Steel & Sumikin Welding Co Ltd Flux-cored wire for horizontal fillet gas shielded arc welding

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JP2014184481A (en) 2014-10-02
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JP6085205B2 (en) 2017-02-22
CN104070305A (en) 2014-10-01

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Application publication date: 20190823