CN104772579A - Multi-electrode single-side submerged-arc welding bond flux - Google Patents
Multi-electrode single-side submerged-arc welding bond flux Download PDFInfo
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- CN104772579A CN104772579A CN201410325533.7A CN201410325533A CN104772579A CN 104772579 A CN104772579 A CN 104772579A CN 201410325533 A CN201410325533 A CN 201410325533A CN 104772579 A CN104772579 A CN 104772579A
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- bead
- welding
- arc welding
- weld metal
- flux
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3602—Carbonates, basic oxides or hydroxides
-
- 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
- B23K9/18—Submerged-arc welding
Abstract
The invention provides multi-electrode single-side submerged-arc welding bond flux, the surface of a surface weld bead can be further prevented from generating iron bulges, firm welded metal without welding defects can be formed, a stable weld bead shape and a stable weld bead appearance can be obtained, and furthermore welded metal which is excellent in mechanical property can be obtained. The multi-electrode single-side submerged-arc welding bond flux is characterized in that the bond flux comprises, by weight, 5%-24% of SiO2, 12%-30% of MgO, 3%-15% of CaO, 5%-17% of Al2O3, 7%-19% of CaF2, 0.5%-5.0% of ZrO2, 0.1%-3.0% of B2O3, 10%-35% of Fe, 0.3%-4.0% of Si, 0.1%-3.0% of Mo, 0.1%-3.0% of Ti, and the reminder comprising a deoxidizing agent, CO2, alkali metal oxide and inevitable impurities.
Description
Technical field
The present invention relates to multi-electrode one side bonded flux used for submerged arc welding used in the large plate connection of shipbuilding etc., be particularly suitable for obtaining the multi-electrode one side bonded flux used for submerged arc welding that stable bead shape can form the weld metal of mechanical excellent performance simultaneously.
Background technology
Submerged-arc welding is following method: scattered along sealing wire by granular solder flux in advance, electrode wires is supplied to continuously wherein, makes the front end of this electrode wires and electric arc occurs between mother metal welds continuously.Utilize this submerged-arc welding method, stable weld job and the mechanical performance of weld metal can be obtained efficiently, be thus used to in the large structures such as shipbuilding, steel construction, deferent, bridge, the vehicle wide spectrum that is representative.
In recent years, along with the high strength of steel and the research of high tenacity have been carried out in the development of energy industry; And the research of extremely thickization of thickness of slab etc. has been carried out in the maximization along with works, and the application percentage of high strength or extremely thick steel increases year by year.Therefore, for submerged-arc welding, in order to improve productivity ratio in welding procedure, guarantee security and durability, require that quality further improves, wherein particularly very big to the requirement of the high efficiency of welding and the high tenacity of weld metal.
Particularly in shipbuilding field, the construction quantity of large-scale bulk freighter, oil carrier, container freighter etc. has the tendency increased year by year, in their construction, in order to boost productivity, guaranteeing security and durability, the expectation for the further high efficiency of welding and the further high tenacity of weld part is very big.
In the construction engineering of this shipbuilding, the large plate as main shaft connects the solder flux copper pad one side submerged-arc welding method shown in many use Fig. 1 (hereinafter referred to FCuB method.)。In this FCuB method, back side solder flux 2 is interspersed among backing copper coin 1 with the degree of about 4mm ~ 7mm, by air Injection in air hose 3, is abutted to first with the groove (Open of the interior side contacts of welded steel 4) back side 4a.And use 2 ~ 4 root wires (ワ イ ヤ) 5 to carry out 1 layer of welding by table side dissemination surface solder flux 6, form surperficial bead and back side bead simultaneously.In this welding method, owing to being attached with back side solder flux 2 at groove back side 4a, thus the contact (working as り) of backing plate is good; And due to the reinforcement that the backing copper coin 1 under backing run agent 2 can be utilized to suppress back side bead, even if thus construct under the welding condition of big current, also can beauty be obtained and the solid back side bead of welding defect.Therefore, FCuB method is widely used in thin plate to slab.
Compared with shielded arc welding or gas shielded arc welding, the welding heat input of submerged-arc welding is high, mother metal dilution rate is large, thus the performance of weld job or weld metal becoming to be grouped into and determine substantially by solder flux and welding wire.In submerged-arc welding, particularly above-mentioned one side submerged-arc welding method has the feature that welding heat input is high, mother metal dilution rate is large.
In this one side submerged-arc welding method, main application is as the bonded flux of sintered flux.Bonded flux adds waterglass etc. and carries out granulation and carry out firing at about 500 DEG C and obtain in various raw material, due to the chemical composition of weld metal freely can be adjusted and can add iron powder, thus there is welding efficiency and increase such advantageous feature.
But, in the one side submerged-arc welding of high speed, easily there is abrasive grit projection on the surface of surperficial bead, and there is the tendency of the easy attachment of slag (ス ラ グ).Particularly from the viewpoint of wire-electrode number, compared with 3 electrodes, there is during 4 electrode the tendency that above-mentioned abrasive grit projection significantly occurs, confirm this and depend on speed of welding.That is, if wire-electrode number increases, then speed of welding may improve; Thus, because speed during 4 electrode accelerates, thus easily there is abrasive grit projection and the slag attachment on surperficial bead surface.
From this viewpoint, someone proposes the submerged arc welding solder flux and one side welding method that can obtain good weld job and weld metal mechanical performance in the past.
Such as, Patent Document 1 discloses the basic technology about the high speed one side submerged-arc welding method utilizing 4 electrodes to carry out.Wherein, in order to obtain solid flawless weld metal in the one side submerged-arc welding of high speed, it has carried out limiting for welding wire footpath, welding current, speed of welding, interelectrode distance, solder flux and component of weld wire thus has sought to improve.But although this technology described in patent document 1 can obtain solid flawless weld metal, it cannot improve abrasive grit projection and the slag attachment on surperficial bead surface, and does not limit the interpolation of deoxidier, alloying constituent in solder flux.Therefore, if the large input thermal weld of slab, then the hot strength of weld metal reduces, and then toughness reduces, and thus there is the problem of the good mechanical properties that can not get stable weld job and weld metal.
Patent Document 2 discloses the high speed one side solder flux used for submerged arc welding of the electrode of more than use 3 electrode and the correlation technique of welding method.Which defines the composition of solder flux, the granularity further defining solder flux is formed and bulk density, thus achieves the improvement of hard real surface bead and back side bead.But in granularity is formed, because the particle of particle diameter more than 840 μm is less than 20 % by weight, thus the particle diameter of solder flux entirety attenuates.Thus, in the conditions at the arc when welding, because of the effect of the tiny solder flux that densification is scattered, electric arc is difficult to expansion, and bead shape is convex, and gas dissipation is deteriorated, the weld defect such as pit and pit can be there is, thus also exist and cannot obtain solid and stable surperficial bead and the problem of back side bead.
In addition, Patent Document 3 discloses the technology for obtaining solid back side bead, wherein using the electrode of more than 3 electrodes, the welding torch angle of butt welding string diameter, welding current, interelectrode distance, electrode limits.Technology technology described in patent document 3 also can obtain solid back side bead when carrying out the submerged-arc welding of high speed one side, but it cannot improve abrasive grit projection and the slag attachment on surperficial bead surface, fails to obtain hard real surface bead.
Patent Document 4 discloses the technology involved by one side submerged-arc welding method utilizing single electrode to carry out.Utilize this method, optimization by speed of welding and welding input heat obtains surperficial bead and all solid, the stable bead shape of back side bead and outward appearance, but owing to being single electrode welding, thus also exist that speed of welding is slack-off, welding efficiency reduces, the significantly reduced problem of production efficiency.
Patent Document 5 discloses the technology about multi-electrode high speed one side bonded flux used for submerged arc welding.The disclosure technology seeks the abrasive grit projection on surperficial bead surface in the submerged-arc welding of high speed one side and the improvement of undercut.In the technology described in patent document 5, define the composition of solder flux composition, particularly make the iron powder (Fe) being considered to abrasive grit projection occurrence cause be less than 5%, result can reduce the generation of abrasive grit projection.But in high speed single-sided welding, the Fe in solder flux is for obtaining stable back side bead shape and the neccessary composition of penetration, and it is also the composition can expecting to improve deposition efficiency.Therefore, when making its addition be less than 5% technology as described in patent document 5, stable back side bead shape cannot be obtained, and deposition efficiency also reduces, thus there is the problem that weld job and production efficiency are significantly deteriorated.
The technology of seeking the abrasive grit projection on surperficial bead surface and the improvement of weld defect relevant to multi-electrode high speed one side bonded flux used for submerged arc welding is also disclosed at patent document 6.In the technology described in patent document 6, the composition that solder flux forms is similarly defined with the technology described in patent document 5, particularly make the iron powder (Fe) being considered to abrasive grit projection occurrence cause be less than 5%, make the joint thickness of slab as welding object be below 16mm further.But, in the technology disclosed in this patent document 6, even if make applied joint thickness of slab be below 16mm as described above, also stable back side bead shape cannot be obtained when Fe addition in solder flux is less than 5%, and deposition efficiency also reduces, thus there is the problem that weld job and production efficiency are significantly deteriorated.
In addition, in the patent document 7 of the applicant, propose the abrasive grit projection can improving surperficial bead surface and weld defect and obtain the technology involved by multi-electrode high speed one side bonded flux used for submerged arc welding of the weld metal of mechanical performance excellence.The abrasive grit projection that technology described in patent document 7 seeks surperficial bead surface by the granularity of the composition and then adjustment solder flux that limit solder flux composition is improved, but the generation of abrasive grit projection cannot be suppressed completely by means of only the restriction of solder flux constituent and the adjustment of flux particle size, and then when steel plate welds, also there is bead shape problem convexly.
Prior art document
Patent document
Patent document 1: Japanese Unexamined Patent Publication 5-337651 publication
Patent document 2: Japanese Unexamined Patent Publication 6-277878 publication
Patent document 3: Japanese Unexamined Patent Publication 8-99178 publication
Patent document 4: Japanese Unexamined Patent Publication 2004-154841 publication
Patent document 5: Japanese Unexamined Patent Publication 2006-272348 publication
Patent document 6: Japanese Unexamined Patent Publication 2007-136516 publication
Patent document 7: Japanese Unexamined Patent Publication 2012-218053 publication
Summary of the invention
Invent problem to be solved
Therefore, the present invention proposes in view of the above problems, its object is to provide a kind of multi-electrode one side bonded flux used for submerged arc welding, utilize this multi-electrode one side bonded flux used for submerged arc welding, even if in the multi-electrode high speed one side submerged-arc welding particularly more than 3 electrodes being steel plate, also can suppress surperficial bead surface that abrasive grit projection occurs further, the solid weld metal of welding defect can be formed, surperficial bead and all stable bead shape of back side bead and bead outward appearance can be obtained, the weld metal of mechanical performance excellence can be obtained further.
Solve the means of problem
In order to solve above-mentioned problem, the raw-material granularity of iron powder etc. that the present inventor uses for chemical composition and the Fe composition of bonded flux is studied.It found that, by the raw-material granularity of iron powder that the chemical composition, further the restriction Fe composition that limit bonded flux use, even in the multi-electrode high speed one side submerged-arc welding more than 3 electrodes of steel plate, also can suppress the surface of surperficial bead that abrasive grit projection occurs further, can be formed welding defect solid weld metal, obtain surperficial bead and all stable bead shape of back side bead and bead outward appearance, the weld metal of mechanical performance excellence can be obtained further.
That is, the feature of the multi-electrode one side bonded flux used for submerged arc welding of the application the 1st invention is, in mass %, it contains: SiO
2: 5% ~ 24%, MgO:12% ~ 30%, CaO:3% ~ 15%, Al
2o
3: 5% ~ 17%, CaF
2: 7% ~ 19%, ZrO
2: 0.5% ~ 5%, B
2o
3: 0.1% ~ 3%, Fe:10% ~ 35%, Si:0.3% ~ 4%, Mo:0.1% ~ 3%, Ti:0.1% ~ 3%, other is by deoxidier, CO
2, alkali metal oxide and inevitably impurity form.
In addition, the feature of the multi-electrode one side bonded flux used for submerged arc welding of the application the 2nd invention is, in the application the 1st invention, further containing Al:0.05% ~ 0.5%.
In addition, the feature of the multi-electrode one side bonded flux used for submerged arc welding of the application the 3rd invention is, in the application the 1st invention or the application the 2nd invention, and TiO
2be less than 1.5%.
Further, the feature of the multi-electrode one side bonded flux used for submerged arc welding of the application the 4th invention is, in the application's 1st invention ~ the application the 3rd invention, the raw-material average grain diameter of the iron powder that Fe composition uses is less than 150 μm.
The effect of invention
By applying multi-electrode one side of the present invention bonded flux used for submerged arc welding, in multi-electrode high speed one side submerged-arc welding particularly more than 3 electrodes of steel plate, also can suppress the surface of surperficial bead that abrasive grit projection occurs further, the solid weld metal of welding defect can be formed, obtain surperficial bead and all stable bead shape of back side bead and bead outward appearance, the weld metal of mechanical performance excellence can be obtained further.
Accompanying drawing explanation
Fig. 1 is the sectional view that solder flux copper pad one side submerged-arc welding method used in embodiments of the invention is shown.
Fig. 2 is the figure of the bevel shape that steel plate used in embodiments of the invention is shown.
The explanation of symbol
1 backing steel plate
2 back side solder flux
3 air hoses
4 welded steels
The 4a groove back side
5 welding wires
6 surperficial solder flux
Detailed description of the invention
In order to can maintain in the multi-electrode one side submerged-arc welding of the steel plate at more than thickness 3mm weld metal good mechanical properties, can suppress further, on the surface of surperficial bead, abrasive grit projection occurs, obtain the surperficial bead of the excellence of welding defect and the shape of back side bead, the raw-material granularity of iron powder etc. that the present inventor uses for chemical composition and the Fe composition of bonded flux is studied in detail.
In multi-electrode high speed one side submerged-arc welding used during the large plate that shipbuilding is built connects, thickness of slab is the wide region of 8mm to 40mm, and the thickness of slab of steel plate is thicker, also needs the welding of large input heat.Therefore, in order to the very good mechanical properties of weld metal also can be obtained in large input thermal weld, need to add deoxidier, alloying constituent etc. in bonded flux, the oxygen content of weld metal is suppressed lower, improve hardenability.But if excessive interpolation deoxidier and alloying constituent, then the hardenability of weld metal is excessive, and intensity increases, toughness reduces.Therefore, in order to develop the bonded flux corresponding with the change of the welding heat input under various thickness of slab, various deoxidier and alloying constituent being studied, found that, by adding Si and Mo in right amount, good weld metal hot strength and toughness can be obtained.
In addition find, by adding Al in right amount, even when the large input thermal weld that steel plate thickness of slab is thicker, good weld metal toughness also can be obtained.
And then, in the improvement of weld job, be improve as the abrasive grit projection on the surperficial bead surface of most important problem in the one side submerged-arc welding of applying in the large plate of shipbuilding connects at present.If surperficial bead generation abrasive grit projection, then in the coating engineering of shipbuilding, have a large amount of coating adhere to or easily peel off due to the shape of abrasive grit projection at abrasive grit jut, the part therefore peeled off, without coating, gets rusty easily, corrosion resistance significantly reduces.Thus, at present in shipyard, utilize grinder or abrasive jet cleaning etc. to remove the abrasive grit projection on surperficial bead surface, thus there is productivity ratio and reduce the problem that cost is raised.
In order to improve above-mentioned problem, the chemical composition for bonded flux is studied.Occur in the reason of abrasive grit projection, the iron powder (Fe) added in bonded flux is reason, weld metal during welding and the iron powder melting added in slag process of setting in bonded flux fall into the weld metal surface of semi-molten state, remain in surface when the state of incomplete penetration.
Therefore, first remove the iron powder in bonded flux, the surface of result surface bead is without abrasive grit projection, but back side bead shape is unstable, and the weld defect such as poor penetration, undercut occurs; Further, because removing iron powder can make deposition efficiency reduce, thus along with the reduction of speed of welding, productivity ratio significantly reduces.Can be distinguished by above-mentioned situation, in high speed single-sided welding, in order to obtain stable back side bead shape, penetration and high deposition efficiency, the iron powder in bonded flux is neccessary composition, cannot remove.
Therefore, premised on the bonded flux of iron powder addition type, be studied bonded flux chemical composition, result is passed through TiO
2, SiO
2, MgO, CaO, A1
2o
3, CaF
2carry out optimization Deng slag composition and successfully decrease abrasive grit projection.But only carrying out optimization to these slags composition cannot suppress abrasive grit projection completely, further slag composition is studied.
Its result is known, containing TiO in slag composition
2time, slag is easily attached to bead surface, can encourage the generation of abrasive grit projection.Therefore, in order to make it not containing TiO
2, by using as possible not containing TiO
2raw material, thus successfully make abrasive grit projection significantly reduce.
But, TiO
2as the essential component that the composition for pilot arc stability and bead flatness is in welding material, by eliminating TiO
2abrasive grit projection can be reduced, but confirm the tendency that arc stability is deteriorated, bead shape wadding is random.In addition, TiO
2can generate Ti oxide etc. in weld metal tissue morphology, become the important karyogenesis site of the acicular ferrite generating fine-grain, this acicular ferrite is effective for the raising of intensity and toughness.Thus, TiO
2the karyogenesis site that can make for generating acicular ferrite of eliminating disappear, confirm the tendency that weld metal toughness reduces.
In order to address these problems, slag composition is studied further, wherein, carry out ZrO
2with the interpolation of metal Ti.With TiO
2equally, ZrO
2also confirm the effect being improved arc stability and bead flatness, and the attachment to slag completely unconfirmed, the tight ness rating (な じ body) confirming bead toe-end portion is further good, slag fissility is also good.
For generate acicular ferrite karyogenesis in by adding metal Ti on a small quantity to carry out, confirm and weld metal toughness improved.
By carrying out the optimization of above-mentioned solder flux chemical composition, significantly can reduce the abrasive grit projection on surperficial bead surface, and excellent weld metal mechanical performance can be obtained, but in high speed with when welding for a long time continuously, the abrasive grit projection on surperficial bead surface cannot be suppressed completely.
Therefore, in order to seek the further improvement that this abrasive grit projection reduces, the raw-material granularity of iron powder that the Fe composition that the present inventor is conceived to bonded flux uses, find by the raw-material granularity of adjustment iron powder, successfully reach complete in abrasive grit projection, obtain good surperficial bead shape and outward appearance.
Distinguished further, if the thickness of slab of steel plate thickens, then the shape of surperficial bead convexly, is studied further.It found that, by adjustment MgO, A1
2o
3and SiO
2amount, in the welding of steel plate, surperficial bead shape also can be made good.
That is, applying in multi-electrode one side of the present invention bonded flux used for submerged arc welding, in mass %, containing SiO
2: 5% ~ 24%, MgO:12% ~ 30%, CaO:3% ~ 15%, A1
2o
3: 5% ~ 17%, CaF
2: 7% ~ 19%, ZrO
2: 0.5% ~ 5%, B
2o
3: 0.1% ~ 3%, Fe:10% ~ 35%, Si:0.3% ~ 4%, Mo:0.1% ~ 3%, Ti:0.1% ~ 3%, other is by deoxidier, CO
2, alkali metal oxide and inevitably impurity form.Now, in mass %, Al:0.05% ~ 0.5% can be contained further.And in mass %, can TiO be made
2be that the raw-material average grain diameter of iron powder that less than 1.5%, Fe composition uses can for being less than 150 μm.Below the restriction reason that the raw-material granularity of the iron powder that flux constituent forms, Fe composition uses applying multi-electrode one side of the present invention bonded flux used for submerged arc welding is formed is described.It should be noted that, the content of each composition, to represent relative to the quality % of multi-electrode one side bonded flux gross mass used for submerged arc welding, when representing this quality %, is only expressed as the record of %.
SiO
2
：5％～24％
With the SiO that silica sand, zircon sand, wollastonite, waterglass (sodium metasilicate, potassium silicate) etc. are raw material
2for the important component for the formation of good welding bead, if but it is too much, then and the oxygen amount in weld metal increases, degraded toughness.SiO
2when being less than 5%, the tight ness rating in bead toe-end portion is deteriorated, the deterioration of slag fissility, and particularly in high speed single-sided welding, also undercut can occur.On the other hand, SiO
2during more than 24%, the oxygen amount of weld metal increases, toughness deterioration.Thus, SiO
2be 5% ~ 24%.
MgO：12％～30％
The MgO being raw material with magnesia clinker, magnesium carbonate etc. has the effect of oxygen amount improving the fire resistance of slag and basicity, reduction weld metal.When MgO is less than 12%, the basicity of solder flux reduces, and the oxygen amount in weld metal increases, toughness deterioration.On the other hand, when MgO is more than 30%, the softening fusion point of solder flux increases, and the ripple on bead surface is thicker, slag fissility and bead bad order.Thus, MgO is 12% ~ 30%.
CaO：3％～15％
The CaO being raw material with wollastonite, calcium carbonate etc. is the important component for the fusing point and mobility adjusting slag.When CaO is less than 3%, the tight ness rating in bead toe-end portion is deteriorated, bead bad order, in high speed single-sided welding, also can produce undercut.On the other hand, when CaO is more than 15%, slag fluidity is bad, and bead height is uneven, slag fissility is also bad.Thus, CaO is 3% ~ 15%.
Al
2
O
3
：5％～17％
Take aluminium oxide as the A1 of main material
2o
3for the very important composition for obtaining good slag fissility and bead outward appearance in high speed single-sided welding.There is effect in addition that make arc stability good.A1
2o
3when being less than 5%, can not get above-mentioned effect.On the other hand, if A1
2o
3more than 17%, then form convex bead (Tu ビ ー De), slag fissility is also bad.Thus, A1
2o
3be 5% ~ 17%.
CaF
2
：7％～19％
Take fluorite as the CaF of raw material
2there is the effect that toughness is improved, but due to its fusing point low, if thus it is too much, the flatness of bead is impaired.CaF
2when being less than 7%, the effect of immalleable improvement; If more than 19%, then can cause bead bad order.Thus, CaF
2be 7% ~ 19%.
ZrO
2
：0.5％～5％
With the ZrO that zircon sand, oxidation zircon etc. are raw material
2to obtain arc stability and good bead shape appearance, slag fissility and very important composition in high speed single-sided welding.ZrO
2when being less than 0.5%, can not get this effect.In addition, if ZrO
2more than 5%, then weld metal oxygen amount increase, toughness deterioration.Thus, ZrO
2be 0.5% ~ 5%.
B
2
O
3
：0.1％～3％
With the B that boron oxide, borax etc. are raw material
2o
3there is the effect that toughness improves.B
2o
3when being less than 0.1%, can not get the effect that toughness improves; If more than 3%, then weld metal solidification, toughness is deteriorated on the contrary.Thus, B
2o
3be 0.1% ~ 3%.
Fe：10％～35％
The Fe being raw material with the ferroalloy such as iron powder and Fe-Si or Fe-Mn has the effect improving deposition efficiency and concentrated electric arc.When Fe is less than 10%, deposition efficiency reduces, the centrality of electric arc is deteriorated, and thus the bead shape of back side bead is unstable.On the other hand, when Fe is more than 35%, there is abrasive grit projection on bead surface thus cause slag fissility bad.Thus, Fe is 10% ~ 35%.
the raw-material granularity of the iron powder that Fe composition uses:
The raw-material granularity of the iron powder that Fe composition uses is at high speed and the important factor in order to make bead surface not have abrasive grit projection completely in welding for a long time continuously.Abrasive grit projection is there is not in order to make bead surface, the commitment when welding is needed to make iron powder melting drop in motlten metal, by the granularity of solder flux entirety being defined as the improvement that best formation is sought to a certain degree, but the raw-material granularity of preferred applied iron powder is the composition of more particulate, and its average grain diameter is preferably less than 150 μm.But in the present invention, the raw-material average grain diameter of iron powder is less than 150 μm is not necessary, even if exceed this particle diameter also can give play to desired effect.
Si：0.3％～4％
With metal Si, Fe-Si, Fe-Si-Mn etc. for the Si of raw material is for deoxidant element, it can reduce the oxygen amount of weld metal.When Si is less than 0.3%, can not get deoxidation effect, toughness deterioration.On the other hand, when Si is more than 4%, the hardness of weld metal is really up to the mark, toughness is deteriorated.Thus, Si is 0.3% ~ 4%.
Mo：0.1％～3％
Increasing element using metal M o, the Fe-Mo Mo that is raw material as the hardenability of weld metal is important composition.The effect that when Mo is less than 0.1%, the intensity of weld metal reduces, also do not have toughness to improve; On the other hand, when Mo is more than 3%, the hardenability of weld metal is excessive, and hardness is really up to the mark, toughness is deteriorated.Thus, Mo is 0.1% ~ 3%.
Ti：0.1％～3％
The Ti being raw material with metal Ti, Fe-Ti etc. generates Ti oxide etc. in the tissue morphology of weld metal, is the important karyogenesis site of acicular ferrite generating fine-grain, this acicular ferrite in the raising of intensity and toughness effectively.When Ti is less than 0.1%, effective acicular ferrite in toughness raising, toughness deterioration cannot be created on.On the other hand, when Ti is more than 3%, the hardness of weld metal is really up to the mark, toughness is deteriorated.Thus, Ti is 0.1% ~ 3%.
Al：0.05～0.5％
Al is strong deoxidier, and in the welding that the large input that the thickness of slab of welding object steel plate is thicker is hot, it can guarantee the toughness of weld metal.When Al is less than 0.05%, can not get the effect guaranteeing toughness when the welding of large input heat.On the other hand, when Al is more than 0.5%, it is excessive residual in weld metal in the form of the oxide, and the toughness of weld metal is reduced.Thus, Al is preferably 0.05% ~ 0.5%.But in the present invention, the content of Al is 0.05% ~ 0.5% is not necessary, even if exceed this scope, also can give play to desired effect.
tiO
2
: less than 1.5%
TiO
2for the active ingredient for pilot arc stability and bead flatness, but it is also for easily making slag be attached to bead surface, encouraging the composition of the generation of abrasive grit projection.Thus, preferably as the TiO of the impurity in each raw material
2content is as far as possible low, and its content is preferably less than 1.5%.But, in the present invention, this TiO
2content be less than 1.5% not for necessary, even if exceed this scope, also can give play to desired effect.
Other is: the deoxidiers such as Mn and Al: less than 0.3%; From the CO of metal carbonate
2; From the K of waterglass
2o and Na
2the alkali metal oxides such as O: less than 4%; And the inevitably impurity such as P, S, due to P and S all can generate low melting point compound, toughness is reduced, thus preferred reduction P and S as far as possible.
It should be noted that, from the CO of the metal carbonate such as calcium carbonate, magnesium carbonate
2be subject to the effect of sweating heat and gasify, there is the protected effect in arc atmosphere and the effect making arc stability.But, if CO
2excessive, then electric arc is unstable, bead is surperficial simultaneously produces pit.Thus, from the CO of metal carbonate
2be preferably 1% ~ 6%.
In addition, the single-sided welding employing multi-electrode one side of the present invention bonded flux used for submerged arc welding can be welded when improving arc stability, welding wire feeding, deposition efficiency, is thus applicable to the multi-electrode one side submerged-arc welding that the welding wire footpath after combining is more than 4.0mm ~ 6.4mm, 3 electrodes.
Embodiment 1
Effect of the present invention is further described below by embodiment.
The welding wire of chemical composition shown in the back side solder flux of chemical composition shown in various flux constituent shown in use table 1 and the bonded flux that the raw-material granularity of the iron powder applied in Fe composition is adjusted, table 2 and table 3, be steel plate (label A) bevel angle be processed into as shown in Figure 2 of 25mm by the thickness of slab of chemical composition shown in table 4 be 50 °, to stew limit be the bevel shape of 5mm, under the welding condition based on the condition No.1 (3 electrode) shown in table 5 or condition No.2 (4 electrode), implement the FCuB one side submerged-arc welding test shown in Fig. 1.
In this FCuB one side submerged-arc welding test, the back side solder flux 2 that composition is as shown in Table 2 formed is disseminated to backing steel plate 1 with about about 4mm ~ 7mm, by air Injection in air hose 3, abutted to the groove back side 4a with the interior side contacts of welded steel 4.And use 2 ~ 4 root wires 5 to carry out 1 layer of welding by table side dissemination surface solder flux 6, form surperficial bead and back side bead simultaneously.
It should be noted that, with waterglass for after the bonded flux shown in sticker his-and-hers watches 1 carries out granulation, at 400 DEG C ~ 550 DEG C, fire 2 hours, whole grain becomes 1.4mm × 0.15mm.
In addition, in the welding wire shown in table 3, these base line drawings, through undergauge, annealing, pickling, copper plating and make base line (plain Line), use to 4.8mm footpath and 6.4mm footpath by former line.
[table 1]
*other is deoxidier, CO
2, alkali metal oxide and inevitable impurity
[table 2]
*other is deoxidier, CO
2, alkali metal oxide and inevitable impurity
[table 3]
*other is Fe and inevitable impurity
[table 4]
[table 5]
About the evaluation of each trial-production bonded flux, slag fissility after arc stability when carrying out one side submerged-arc welding under condition No.1 or condition No.2, welding, with or without undercut, investigation with or without the abrasive grit projection on surperficial bead surface and slag attachment, bead face shaping, carry out the investigation of the hot strength of weld metal, toughness and weld metal oxygen amount further.
About the mechanical performance evaluation of weld metal, centered by the central authorities of the steel plate thickness of slab of soldering test body, take Charpy impact test sheet (JIS Z2242V notched specimen) and tension test sheet (No. Z224110, JIS), implement mechanical test.The Charpy impact test of the evaluation ideas-20 DEG C of toughness is carried out, and uses 3 samples to repeat test respectively, evaluates with mean value.It should be noted that, in Charpy impact test, absorption energy is more than 80J is good.During hot strength is evaluated, 490MPa ~ 690MPa is good.These investigation results are shown in Table 6 in the lump.
[table 6]
Solder flux label F1 ~ F10 in table 1 and table 6 is the present invention's example, solder flux label F11 ~ F22 is comparative example.As in the solder flux label Fl ~ F3 of example of the present invention, F5, F6, F8 and F9, flux constituent and the raw-material average grain diameter of iron powder are suitable, thus in the one side submerged-arc welding based on 3 electrodes or 4 electrodes, equal arc stability and slag fissility be good, without the abrasive grit projection on surperficial bead surface and slag attachment, surface bead and back side bead all have good bead shape appearance, the mechanical performance of weld metal is also excellent, is the result be very satisfied with.It should be noted that, in solder flux label F4 and F7, because the raw-material average grain diameter of iron powder is large, thus there occurs the projection of iron powder slightly.In addition, in solder flux label F10, due to TiO
2many, thus in surperficial bead surface a small amount of generation abrasive grit projection and slag attachment, but be practical no problem scope.
In the solder flux label F11 of comparative example, due to SiO
2few, the tight ness rating in bead toe-end portion is poor, slag fissility is bad, also there occurs undercut.In addition, due to B
2o
3few, thus the absorption energy of weld metal is low value.
In solder flux label F12, due to SiO
2many, thus many, the absorption energy of the oxygen amount of weld metal is low value.In addition, because the raw-material average grain diameter of iron powder is large, thus there occurs a small amount of abrasive grit projection at surperficial bead.
In solder flux label F13, because MgO is few, thus many, the absorption energy of the oxygen amount of weld metal is low value.In addition, due to TiO
2many, thus slag is attached to bead surface on a small quantity, also there occurs abrasive grit projection slightly.
In solder flux label F14, because MgO is many, thus thicker, the slag fissility of the ripple on bead surface and bead degraded appearance.In addition, because Ti is many, thus the hot strength of weld metal increases, absorbs energy is low value.
In solder flux label F15, because CaO is few, thus poor, the bead bad order of the tight ness rating in bead toe-end portion, also there occurs undercut.In addition, because Ti is few, thus the absorption energy of weld metal is low value.
In solder flux label F16, because CaO is many, thus bead outward appearance and slag fissility bad.In addition, because Mo is many, thus high, the absorption energy of the hot strength of weld metal is low value.
In solder flux label F17, due to A1
2o
3few, thus electric arc instability, slag fissility and bead bad order.In addition, because Mo is few, thus the hot strength of weld metal is low value with absorbing energy.
In solder flux label F18, due to A1
2o
3many, thus bead shape and slag fissility bad.In addition, because Si is many, thus the hot strength of weld metal increases, absorbs energy is low value.
In solder flux label F19, due to CaF
2few, thus the absorption energy of weld metal is low value.In addition, because Fe is many, thus there is abrasive grit projection on bead surface, slag attachment occurs, slag fissility is also bad.
In solder flux label F20, due to CaF
2many, thus bead shape defect.In addition, because Si is few, thus many, the absorption energy of the oxygen amount of weld metal is low value.
In solder flux label F21, due to ZrO
2few, thus electric arc instability, bead shape appearance and slag fissility are bad.In addition, due to B
2o
3many, thus high, the absorption energy of the hot strength of weld metal is low value.
In solder flux label F22, due to ZrO
2many, thus many, the absorption energy of the oxygen amount of weld metal is low value.In addition, because Fe is few, thus few, the surperficial bead shape defect of deposition amount; And because the centrality of electric arc is poor, thus the bead shape of back side bead is also unstable.
Embodiment 2
The welding wire of chemical composition shown in the back side solder flux of chemical composition shown in various flux constituent shown in use table 7 and the bonded flux that the raw-material granularity of the iron powder applied in Fe composition is adjusted, table 2, table 3, be steel plate (label B) bevel angle be processed into as shown in Figure 2 of 40mm by the thickness of slab of chemical composition shown in table 4 be 50 °, to stew limit be the bevel shape of 5mm, under the welding condition based on the condition No.3 (4 electrode) shown in table 5, implement the FCuB one side submerged-arc welding test shown in Fig. 1.The detailed content of FCuB one side submerged-arc welding test method is identical with embodiment 1.
About the evaluation of each trial-production bonded flux, slag fissility after arc stability when carrying out one side submerged-arc welding under condition NO.3, welding, with or without undercut, investigation with or without the abrasive grit projection on surperficial bead surface and slag attachment, bead face shaping, carry out the investigation of the hot strength of weld metal, toughness and weld metal oxygen amount further.
About the mechanical performance evaluation of weld metal, centered by the central authorities of the steel plate thickness of slab of soldering test body, take Charpy impact test sheet (JIS Z2242V notched specimen) and tension test sheet (No. Z224110, JIS), implement mechanical test.The Charpy impact test of the evaluation ideas-20 DEG C of toughness is carried out, and uses 3 samples to repeat test respectively, evaluates with mean value.It should be noted that, in Charpy impact test, absorption energy is more than 80J is good.During hot strength is evaluated, 490MPa ~ 690MPa is good.These results of study are shown in Table 8 in the lump.
[table 8]
Solder flux label F23 ~ F26 in table 7 and table 8 is the present invention's example, solder flux label F27 ~ F30 is comparative example.As in the solder flux label F23 ~ F26 of example of the present invention, flux constituent and the raw-material average grain diameter of iron powder are suitable, thus in the one side submerged-arc welding of 4 electrodes based on large input heat, arc stability and slag fissility be good, without the abrasive grit projection on surperficial bead surface and slag attachment, surface bead and back side bead all have good bead shape appearance, the mechanical performance of weld metal is also excellent, is the result be very satisfied with.
In the solder flux label F27 of comparative example, owing to not containing Al, thus the absorption energy of weld metal is low value.
In solder flux label F28, because Al is many, thus the absorption energy of weld metal is low value.
In solder flux label F29, due to TiO
2many, thus a small amount of slag is attached to bead surface, also slightly abrasive grit projection occurs.In addition, because Al is few, thus the absorption energy of weld metal is low value.
In solder flux label F30, because the raw-material average grain diameter of iron powder is large, thus there is abrasive grit projection slightly at surperficial bead.In addition, because Al is many, thus the absorption energy of weld metal is low value.
Claims (4)
1. a multi-electrode one side bonded flux used for submerged arc welding, is characterized in that, in mass %, it contains:
SiO
2：5％～24％、
MgO：12％～30％、
CaO：3％～15％、
A1
2O
3：5％～17％、
CaF
2：7％～19％、
ZrO
2：0.5％～5％、
B
2O
3：0.1％～3％、
Fe：10％～35％、
Si：0.3％～4％、
Mo：0.1％～3％、
Ti：0.1％～3％，
Other is by deoxidier, CO
2, alkali metal oxide and inevitably impurity form.
2. multi-electrode one side bonded flux used for submerged arc welding as claimed in claim 1, is characterized in that, in mass %, it is further containing Al:0.05% ~ 0.5%.
3. multi-electrode one side bonded flux used for submerged arc welding as claimed in claim 1 or 2, is characterized in that, in mass %, it is further containing TiO
2: less than 1.5%.
4. the multi-electrode one side bonded flux used for submerged arc welding as described in any one of claims 1 to 3, is characterized in that, the raw-material average grain diameter of the iron powder that Fe composition uses is less than 150 μm.
Applications Claiming Priority (2)
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|---|---|---|---|
| JP2014-004851 | 2014-01-15 | ||
| JP2014004851 | 2014-01-15 |
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|---|---|
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|---|---|---|---|
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| CN (1) | CN104772579A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106363284A (en) * | 2016-12-06 | 2017-02-01 | 武汉天高熔接股份有限公司 | Material suitable for submerged arc welding, anatexis and single-side welding process |
| CN107303630A (en) * | 2016-04-22 | 2017-10-31 | 海宁瑞奥金属科技有限公司 | High arrest toughness welding wire for submerged-arc welding, solder flux and weld metal |
| CN108145343A (en) * | 2016-12-05 | 2018-06-12 | 株式会社神户制钢所 | Solder flux used for submerged arc welding |
| CN108274157A (en) * | 2017-01-05 | 2018-07-13 | 株式会社神户制钢所 | Pad solder flux |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024057534A1 (en) * | 2022-09-16 | 2024-03-21 | 日本製鉄株式会社 | Baked flux, method for manufacturing submerged-arc-welded joint, and submerged-arc-welded joint |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58196195A (en) * | 1982-05-13 | 1983-11-15 | Nippon Steel Corp | Baked flux for horizontal fillet submerged arc welding |
| JP3157060B2 (en) * | 1993-03-31 | 2001-04-16 | 株式会社神戸製鋼所 | Highly basic molten flux |
| JPH08155673A (en) * | 1994-12-08 | 1996-06-18 | Nippon Steel Corp | Wire, bond flux and welding method for submerged arc welding of high performance 570mpa steel |
| JP4489009B2 (en) * | 2005-11-18 | 2010-06-23 | 株式会社神戸製鋼所 | Bond flux for submerged arc welding |
| JP5766500B2 (en) * | 2011-05-06 | 2015-08-19 | 株式会社神戸製鋼所 | Submerged arc welding material and submerged arc welding method |
| JP6037781B2 (en) * | 2012-11-05 | 2016-12-07 | 日鐵住金溶接工業株式会社 | Bond flux for multi-electrode single-sided submerged arc welding |
-
2014
- 2014-07-09 CN CN201410325533.7A patent/CN104772579A/en active Pending
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107303630A (en) * | 2016-04-22 | 2017-10-31 | 海宁瑞奥金属科技有限公司 | High arrest toughness welding wire for submerged-arc welding, solder flux and weld metal |
| CN108145343A (en) * | 2016-12-05 | 2018-06-12 | 株式会社神户制钢所 | Solder flux used for submerged arc welding |
| CN108145343B (en) * | 2016-12-05 | 2020-08-25 | 株式会社神户制钢所 | Flux for submerged arc welding |
| CN106363284A (en) * | 2016-12-06 | 2017-02-01 | 武汉天高熔接股份有限公司 | Material suitable for submerged arc welding, anatexis and single-side welding process |
| CN108274157A (en) * | 2017-01-05 | 2018-07-13 | 株式会社神户制钢所 | Pad solder flux |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5869066B2 (en) | 2016-02-24 |
| JP2015155111A (en) | 2015-08-27 |
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