CN110202290A - A kind of high-strength weathering steel flux-cored wire and its application - Google Patents

A kind of high-strength weathering steel flux-cored wire and its application Download PDF

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Publication number
CN110202290A
CN110202290A CN201910457768.4A CN201910457768A CN110202290A CN 110202290 A CN110202290 A CN 110202290A CN 201910457768 A CN201910457768 A CN 201910457768A CN 110202290 A CN110202290 A CN 110202290A
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Prior art keywords
cored wire
welding
weathering steel
medicine core
flux
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CN201910457768.4A
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CN110202290B (en
Inventor
蔡俊
杨恒闯
杨宗全
陈成
宋昌宝
何涛
刘�东
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Wuhan Tiemiao Welding Materials Co Ltd
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Wuhan Tiemiao Welding Materials Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36Selection 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36Selection 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
    • B23K35/362Selection of compositions of fluxes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas

Abstract

The invention belongs to technical field of welding materials, and in particular to a kind of high-strength weathering steel flux-cored wire, including crust and it is filled in the outer intracutaneous medicine core, the mass percentage that the component and each component of the medicine core account for the medicine core is as follows: TiO235%~42%, potassium titanate 5%~8%, silicate 3%~5%, sodium fluoride 2%~3%, Si 3%~6%, Mn 12%~18%, Mg 3%~6%, Cu 2%~6%, Ni 9%~16%, Cr 3%~9%, Fe surplus.The present invention also provides the applications of above-mentioned flux-cored wire, the all-position welding for high-strength weathering steel.High-strength weathering steel provided by the invention flux-cored wire passes through medicine core powder to deposited metal transition suitable Ni, Cr, Cu and other alloying elements, make welding metal that there is excellent weatherability, its weather-proof index I can be greater than 6.5, and weld decay tendency is small, welded highly-safe;It can be used for CO2Gas shielded arc welding all-position welding, welding technological properties is excellent, and appearance of weld is beautiful.

Description

A kind of high-strength weathering steel flux-cored wire and its application
Technical field
The invention belongs to technical field of welding materials, and in particular to a kind of high-strength weathering steel flux-cored wire and its answer With.
Background technique
Weathering steel is more already used for bridge, automobile, railway because it has the characteristics of atmospheric corrosion resistance, in the U.S., Japan The industries such as vehicle have and mitigate self weight, save maintenance cost, improve the advantages such as efficiency of construction.Normal steel structure bridge is at this stage Corrosion is mainly solved the problems, such as using coating, but coating expense and later maintenance cost are higher.Therefore Weather-resistance bridge with steel at home Broad development has been obtained outside.Weathering steel also needs the weather resistance for having excellent in addition to good mechanical property.Its mating medicine core weldering Silk will match in terms of intensity, plasticity, low-temperature flexibility and weatherability with corresponding steel plate accordingly, AWS D1.5 regulation weldering The anti-corrosion index I for stitching metal must not be lower than 6.0.When welding weathering steel using common flux-cored wire, the corrosion resistance of welding point It cannot ensure, making welding structure, there are security risks, if solving the problems, such as corrosion by coating, will increase maintenance cost.Portion Steel splitting material smelts unit and the exploitation of weathering steel Q420NHq is completed, therefore, it is necessary to which developing one kind can be with mating weathering steel The flux-cored wire of Q420NHq, makes its deposited metals tensile strength be greater than 550MPa, and -40 DEG C of low-temperature impact toughness are greater than 60J, prolong Rate is stretched greater than 20%, to meet its welded safe handling demand and service life.
Summary of the invention
In order to overcome the shortcomings of the prior art described above, the object of the present invention is to provide a kind of weather-proof index I to be greater than 6.5 Intensity weathering steel flux-cored wire and its application, can be used for welding tensile strength greater than 550MPa grades of high-strength weathering steel All-position welding, weld decay tendency is small, welded highly-safe.
To achieve the above object, the technical scheme is that a kind of high-strength weathering steel flux-cored wire, including crust And it is filled in the outer intracutaneous medicine core, the mass percentage that the component and each component of the medicine core account for the medicine core is as follows: TiO235%~42%, potassium titanate 5%~8%, silicate 3%~5%, sodium fluoride 2%~3%, Si 3%~6%, Mn 12%~ 18%, Mg 3%~6%, Cu 2%~6%, Ni 9%~16%, Cr 3%~9%, Fe surplus.
Further, it is 14.0%~14.5% that the medicine core, which accounts for the mass percentage of the flux-cored wire,.
Further, in the deposited metal of the flux-cored wire, the mass percentage of Ni element is 1.20%~1.90%, The mass percentage of Cr element is that the mass percentage of 0.25%~0.40%, Cu element is 0.35%~0.50%.
As a preferred embodiment, the mass percentage that each component accounts for the medicine core is as follows in the medicine core: TiO236%, potassium titanate 7%, silicate 4%, sodium fluoride 2%, Si 6%, Mn 14%, Mg 6%, Cu 5%, Ni 9%, Cr 5%, Fe 6%。
As a preferred embodiment, the mass percentage that each component accounts for the medicine core is as follows in the medicine core: TiO241%, potassium titanate 5%, silicate 5%, sodium fluoride 2%, Si 3%, Mn 17%, Mg 5%, Cu 3%, Ni 13%, Cr 4%, Fe 2%。
As a preferred embodiment, the mass percentage that each component accounts for the medicine core is as follows in the medicine core: TiO240%, potassium titanate 4%, silicate 3%, sodium fluoride 2.8%, Si 4%, Mn 16%, Mg 3%, Cu 4%, Ni 14%, Cr 8%, Fe 0.2%.
The present invention also provides the applications of above-mentioned flux-cored wire, the all-position welding for 550MPa grades of weathering steels.
Further, using CO2Gas shielded arc welding, welding current are 240A~250A, and weldingvoltage is 26.5V~27V, Speed of welding 25.7cm/min.
Design principle of the invention is as follows:
TiO2: slag fusing point and viscosity are adjusted, arc stability and appearance of weld are improved.Arc stability when additional amount is less than 35% Property is bad, influences the capability of welding vertically upwards energy;When additional amount is more than 42%, appearance of weld can be made to be deteriorated, molten pool gas be not easy evolution and Generate stomata;Therefore, additional amount control is 35~42%.
Potassium titanate: adjustable arc stability keeps electric arc soft, reduces and splash;When additional amount is less than 5%, arc stability Effect is unobvious, and additional amount is more than 8%, easily causes slag to accumulate, influences appearance of weld;Therefore additional amount control is 5%~8%.
Silicate: can reduce the surface tension of molten iron in molten bath, enhance molten iron flow, refine molten drop, reduce and splash, change Kind slag covering performance;When additional amount is less than 3%, above-mentioned effect is unobvious;Otherwise when additional amount is more than 5%, slag can be reduced Fusing point, slag fluidity is too strong, and fillet weld isogonality is made to be deteriorated.
Sodium fluoride: being used as dehydrogenation agent, reduces weld seam diffusible hydrogen content;Dehydrogenation scarce capacity when additional amount is less than 2%, weld seam It is also easy to produce stomata load mould;Spatter and flue dust increase when additional amount is more than 3%, influence welding technological properties.
Si:Si is important deoxidier, can reduce the oxygen content of weld metal in welding wire containing a certain amount of Si, improve low temperature Impact flexibility adjusts the mobility of molten iron;Si element is conducive to refine the oxide in rusty scale in weathering steel, to reduce resistance to Wait the general corrosion rate of steel.Si additional amount will lead to deoxidation deficiency when being lower than 3%, weld metal intensity and low-temperature impact toughness are not It is able to satisfy requirement;Weld strength can be made excessively high when additional amount is more than 6%, plastic property of weld bead decline, crack resistance are deteriorated.
Mn:Mn is main deoxidier, reduces the oxygen content of weld metal, increases weld metal intensity and crack resistance.Work as Mn Additional amount will lead to deoxidation deficiency when being lower than 12%, weld metal intensity and low-temperature impact toughness cannot be met the requirements;Work as additional amount Weld strength can be made excessively high when more than 18%, plastic property of weld bead decline.
Mg:Mg is strong deoxidier, improves impact flexibility, and additional amount improves low-temperature impact toughness ability and deoxidation when being less than 3% Scarce capacity causes setting rate to be accelerated when greater than 5% since the containing magnesium oxide of deoxidation products rises the fusing point of slag, It is unfavorable for the exclusion of weld seam gas, will also result in vertical position welding forming and be deteriorated.When adopting total magnalium or Al powder deoxidation, because its deoxidation produces Object contains aluminium oxide, unfavorable to -40 DEG C of low-temperature impacts of its deposited metals, reduces low-temperature impact toughness;Therefore Mg deoxidation is selected.
The rotproofness of weathering steel can be improved in Cu:Cu;For weathering steel in corrosion process, surface generates the enrichment phenomenon of Cu, It is inside that one layer of close CuO middle layer is formed between corrosion layer and the enriched layer of Cu, can slow down or corrosive medium is prevented to continue It corrodes.Said effect is unobvious when Cu additional amount is lower than 2%, and weather-proof index I is relatively low, and when more than 6%, weld seam is also easy to produce fire check.
The self-corrosion point of steel can be improved in the addition of Ni:Ni, increases the stability of steel.It is above-mentioned when additional amount is lower than 9% Effect is unobvious, and weather-proof index I is relatively low, is also easy to produce fire check when more than 16%.Ni element be also good solution strengthening element and The element of low-temperature flexibility transition temperature is reduced, addition Ni element it is low can to improve its while increasing deposited metals tensile strength Warm toughness.It is greater than 490MPa grades of weathering steel flux-cored wires relative to tensile strength, 550MPa grade flux-cored wire of the invention passes through Increase Ni member and usually improve deposited metals tensile strength, and improves the low-temperature flexibility at -40 DEG C.
Cr:Cr is alloying element common in weathering steel, and Cr can form fine and close oxidation film in steel surface, promote electrode Current potential generates passivation effect, improves the corrosion resistance of steel.The corrosion resistance effect of steel is improved especially when being added in steel simultaneously with Cu element Obviously.When additional amount is lower than 3%, said effect is unobvious, and weather-proof index I is relatively low;It can make steel carbon equivalent or welding when more than 9% Cool attenuation index improves, and improves tendency of hardenability, and impact flexibility declines therewith.
Compared with prior art, the invention has the following advantages:
(1) high-strength weathering steel provided by the invention with flux-cored wire by medicine core powder to the suitable Ni of deposited metal transition, Cr, Cu and other alloying elements make welding metal have excellent weatherability, and weather-proof index I is greater than 6.5, and welding point is rotten Erosion tendency is small, welded highly-safe;
(2) high-strength weathering steel flux-cored wire provided by the invention is controlled in weld metal by the adjustment to medicine core component Mn, Si, C content, and adjustment Ni, Cr, Cu constituent content, guarantee that deposited metal tensile strength is higher than 550MPa, elongation percentage is big Energy, which is absorbed, in 20%, -40 DEG C of low-temperature impact is greater than 60J;
(3) high-strength weathering steel flux-cored wire provided by the invention can be used for CO2Gas shielded arc welding all-position welding, welding Processing performance is excellent, and appearance of weld is beautiful.
Specific embodiment
The following is a clear and complete description of the technical scheme in the embodiments of the invention, it is clear that described embodiment Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field Art personnel all other embodiment obtained without making creative work belongs to the model that the present invention protects It encloses.
The each component of medicine core and its quality percentage of the medicine core is accounted in the flux-cored wire that the embodiment of the present invention 1~3 provides Content is as shown in table 1, and wherein medicine core accounts for the 14% of flux-cored wire gross mass.
Deposited metal physicochemical property is carried out to three kinds of flux-cored wires made from the medicine core powder using above three embodiments Test, test plate (panel) groove, size, sampling method and position are according to chinese national standard GB/T 10045 " non-alloyed steel and fine grain Grain steel flux-cored wire " it carries out.The CO of use2Gas shielded arc welding, access DC reverse connection formula power supply are subjected to.Embodiment 1, 2,3 welding current 240A~250A, weldingvoltage 26.5V~27V, speed of welding 25.7cm/min.Obtained by each embodiment Welding wire deposited metal composition, weather-proof index I, mechanical property are shown in Table 2, table 3.
Wherein, in the present embodiment weather-proof index I calculation formula are as follows:
I=26.01(%Cu)+3.88(%Ni)+1.20(%Cr)+1.48(%Si)+17.28(%P)-7.29(%Cu)×(%Ni)- 9.10(%Ni)×(%P)-33.39(%Cu)2Calculate separately out the weather-proof index of the deposited metal of embodiment 1,2,3;From table 2 It can be seen that the embodiment of the present invention uses CO2When gas shielded arc welding, weather-proof index I is greater than 6.5, has excellent corrosion resistance Energy.
From table 3 it can be seen that using CO2When gas shielded arc welding, the tensile strength of the deposited metal of embodiment 1,2,3 is big In 550MPa, -40 DEG C of impacts are all larger than 60J, have stable mechanical property, processing performance is excellent, can all-position welding, electric arc Stablize, appearance of weld is beautiful.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.

Claims (8)

1. a kind of high-strength weathering steel flux-cored wire, including crust and it is filled in the outer intracutaneous medicine core, which is characterized in that The mass percentage that the component and each component of the medicine core account for the medicine core is as follows: TiO235%~42%, potassium titanate 5%~ 8%, silicate 3%~5%, sodium fluoride 2%~3%, Si 3%~6%, Mn 12%~18%, Mg 3%~6%, Cu 2%~6%, Ni 9%~16%, Cr 3%~9%, Fe surplus.
2. a kind of high-strength weathering steel flux-cored wire as described in claim 1, it is characterised in that: the medicine core accounts for the medicine The mass percentage of core welding wire is 14.0%~14.5%.
3. a kind of high-strength weathering steel flux-cored wire as described in claim 1, it is characterised in that: the flux-cored wire melts In metallisation, the mass percentage of Ni element be the mass percentage of 1.20%~1.90%, Cr element be 0.25%~ The mass percentage of 0.40%, Cu element is 0.35%~0.50%.
4. a kind of high-strength weathering steel flux-cored wire as described in claim 1, it is characterised in that: each component accounts for the medicine core Mass percentage it is as follows: TiO236%, potassium titanate 7%, silicate 4%, sodium fluoride 2%, Si 6%, Mn 14%, Mg 6%, Cu 5%, Ni 9%, Cr 5%, Fe 6%.
5. a kind of high-strength weathering steel flux-cored wire as described in claim 1, it is characterised in that: each component accounts for the medicine core Mass percentage it is as follows: TiO241%, potassium titanate 5%, silicate 5%, sodium fluoride 2%, Si 3%, Mn 17%, Mg 5%, Cu 3%, Ni 13%, Cr 4%, Fe 2%.
6. a kind of high-strength weathering steel flux-cored wire as described in claim 1, it is characterised in that: each component accounts for the medicine core Mass percentage it is as follows: TiO240%, 5 % of potassium titanate, silicate 3%, sodium fluoride 2.8%, Si 4%, Mn 16%, Mg 3%, Cu 4%, Ni 14%, Cr 8%, Fe 0.2%.
7. the application of high-strength weathering steel flux-cored wire as described in any one of claims 1 to 6, it is characterised in that: described Flux-cored wire is used for the all-position welding of 550MPa grades of weathering steels.
8. the application of high-strength weathering steel flux-cored wire as claimed in claim 7, it is characterised in that: use CO2Gas is protected Shield weldering, welding current are 240A~250A, and weldingvoltage is 26.5V~27V, speed of welding 25.7cm/min.
CN201910457768.4A 2019-05-29 2019-05-29 Flux-cored wire for high-strength weathering steel and application thereof Active CN110202290B (en)

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