CN103753046A - Welding flux for carbon steel submerged arc strip surfacing and preparation method for welding flux - Google Patents
Welding flux for carbon steel submerged arc strip surfacing and preparation method for welding flux Download PDFInfo
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- CN103753046A CN103753046A CN201410016872.7A CN201410016872A CN103753046A CN 103753046 A CN103753046 A CN 103753046A CN 201410016872 A CN201410016872 A CN 201410016872A CN 103753046 A CN103753046 A CN 103753046A
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- welding 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
- B23K35/24—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
- B23K35/306—Fe as the principal constituent with C as next major constituent, e.g. cast iron
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
-
- 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
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
-
- 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 welding flux for carbon steel submerged arc strip surfacing and a preparation method for the welding flux, and belongs to the field of welding materials. The welding flux for carbon steel submerged arc strip surfacing comprises the following components in percentage by weight: 30-45% of SiO2, 25-35% of MgO, 8-20% of Al2O3, 8-20% of CaF2, 2-8% of CaO, 5-12% of MnO, 1-2% of Na2O and 1-2% of K2O. By using the welding flux for the carbon steel submerged arc strip surfacing and the preparation method for the welding flux, surfacing on a transition layer of the surface of carbon steel is performed by the welding flux and a welding strip, a welding process is stable, an effect of fusion between welding ways is high, residues are removed easily, surfaces of the welding ways are formed attractively, edges of welding joints are neat, and requirements of thin-walled pressure vessels such as a boiler and a nuclear power station on surfacing of the transition layer of the carbon steel can be met.
Description
Technical field
The invention belongs to field of welding material, be specifically related to solder flux and preparation method thereof for a kind of carbon steel strip cladding SAW.
Background technology
The thick-walled pressure vessel of the hydrogenation reactor of petroleum chemical industry, former stream synthetic tower, reactor and nuclear power station etc. all need to move under high temperature and high pressure environment, and majority is subject to the corrosion of medium, and common material cannot bear.If the integral body of these containers adopts stainless steel manufacture, can greatly increase cost, and because the intensity of stainless steel own is not high, if strengthen wall thickness, can increase the difficulty of processing and manufacturing.Current common way is at the inner surface of container, to carry out the stainless steel lining of the corrosion such as large-area heap soldering high temperature resistant, antioxygen, anti-H 2 S, to meet the double requirements of vessel strength and corrosion resistance.Along with the development dynamics of country's increasing petrochemical industry and nuclear power, stainless steel strip surfacing is used more and more widely in the device fabrications such as China's oil, chemical industry, nuclear power.
Existing strip surfacing technique mainly contains two kinds, is respectively band utmost point submerged arc overlay welding and strip electrode electroslag surfacing.For strip electrode electroslag surfacing, because welding process is Electroslag Process, steel belt melting completes by the resistance heat that melting welding slag produces in advance by electric current, this technological requirement welding parameter is stable, can not have too great fluctuation process, so higher to welding equipment requirement, simultaneously because Electroslag Process weld penetration is more shallow, be prone to the defects such as incomplete fusion, slag inclusion, for overlay cladding, in follow-up use procedure, be prone to hydrogen peeling.So when general applications strip surfacing, generally adopt strip cladding SAW.
When the thick-walled pressure vessel built-up welding stainless steel lining of boiler, nuclear power station, for the carbon steel layer of avoiding stainless steel weld overlays and container is because the impact of chemical composition produces the harmful metallographic structure that is unfavorable for the good operation of product, before built-up welding stainless steel lining, need built-up welding one deck mild steel transition zone.How to improve the formula of solder flux and the mentality of designing of preparation for strip cladding SAW, solve the problems such as the stability of solder flux in welding process, spatter, welding pore, welding bead moulding, making welding quality meet the requirements of thick-walled pressure vessel to built-up welding carbon steel transition zone such as boiler, nuclear power station, is very important research topic.
Summary of the invention
For addressing the above problem, the invention provides solder flux and preparation method thereof for a kind of carbon steel strip cladding SAW, this solder flux coordinates welding steel surface to be carried out to the built-up welding of transition zone, welding process is stable, between welding bead and welding bead, well, de-slag is easy in fusion, and welding bead surface forming is attractive in appearance, weld edge is neat, can meet the requirements of thick-walled pressure vessel to built-up welding carbon steel transition zone such as boiler, nuclear power station.The present invention adopts following technical scheme:
A carbon steel strip cladding SAW solder flux, is characterized in that: described solder flux comprises the component of following percentage by weight:
SiO
2：30-45%；
MgO?：25-35%；
Al
2O
3?：8-20%；
CaF
2?：8-20%；
CaO?：2-8%；
MnO?：5-12%；
Na
2O?：1-2%；
K
2O?：1-2%。
Preferably, described solder flux comprises the component of following percentage by weight:
SiO
2：30~36%；
MgO：27~32%；
Al
2O
3：12~16%；
CaF
2：8~12%；
CaO：3~5%；
MnO：6~8%；
Na
2O：1~1.6%；
K
2O：1~1.4%。
Preferably, described solder flux comprises the component of following percentage by weight:
SiO
2：33%；
MgO：30%；
Al
2O
3：13%；
CaF
2：10%；
CaO：3.0%；
MnO：8.0%；
Na
2O：1.6%；
K
2O：1.4%。
A kind of method of preparing carbon steel strip cladding SAW use solder flux recited above, it is characterized in that comprising the following steps: after each component of solder flux is mixed in proportion, add the binding agent of 15-20% solder flux gross mass to carry out mixing granulation, again through the low-temperature bake of 100-200 ℃ and the high temperature sintering of 600-800 ℃, final sizing goes out the particle of object size, is described carbon steel strip cladding SAW solder flux.
Preferably, described binding agent is the combination of a kind of in sodium metasilicate, potassium silicate or two kinds.
Preferably, the temperature of described low-temperature bake is 150 ℃; The temperature of described high temperature sintering is 700 ℃.
Design of the present invention is as follows:
The present invention has designed a kind of SiO
2-MgO-Al
2o
3-CaF
2neutral slag system, has determined composition and each component content of solder flux by a large amount of creationary tests.By to the determining of the selection of each component materials and content thereof, make slag there is suitable surface tension and viscosity, improved the mobility of slag.Also the aspects such as slag fusing point, linear expansion coefficient are adjusted simultaneously, made skull there is the good removability of slag; Adjustment to content of material such as potassium, sodium, has improved the arc stability of solder flux.
In solder flux provided by the invention:
SiO
2being the main component that improves welding technological properties, is also main slag making composition.SiO
2be a kind of acidic materials, reduce flux basicity, in solder flux with CaF
2arrange in pairs or groups, can affect the anti-pore ability of solder flux.SiO
2can adjust freezing point, surface tension and the cinder high-temperature viscosity of slag, the effect important to having of welding bead outward appearance and shape.SiO
2larger on removability of slag impact, along with SiO
2the increase of amount, de-slag becomes easily, and antioxygenic property also strengthens, and surface pressing pit reduces, but along with SiO
2the further increase of amount, the welding composite technology performance of solder flux but reduces step by step.For this reason, determine SiO
2content is at 30-45%.
MgO is good slag making materials, and it can increase the gas permeability of slag, suppresses surface oxidation, reduces the viscosity of acid slag, reduces the content of diffusible hydrogen simultaneously, and has the capillary effect of the slag of increase.Increase along with MgO content, the coefficient of expansion of slag increases, and welding composite technology performance is also in improve progressively, but MgO fusing point is higher, increase viscosity coefficient of dross, improve slag setting temperature, the mobility that suppresses slag makes appearance of weld variation, slag hardening, de-slag difficulty, thereby MgO content can not be too much.In this invention, in order to guarantee Weld Performance, by studying and adjusting, MgO addition is controlled at 25-35%.
Al
20
3it is the main component that affects the removability of slag, in low basicity situation, can make the surface tension of slag reduce, in addition its fusing point is higher, differing greatly of the coefficient of expansion of high temperature and iron, along with the increase of its addition, ripple attenuates. and appearance of weld improves and is conducive to de-slag, and welding composite technology performance also improves accordingly.But, along with Al
2o
3the further increase of amount, de-slag becomes more and more difficult, welds composite technology performance simultaneously and is also progressively reducing.So content should be controlled at 10-30%.
MnO in welding process with SiO
2be combined into compound silicate; form good welding slag; protection deposited metal, make deposited metal not be subject to the impact of N and O in air, and the manganese element being reduced is main alloying component in weld seam; can improve weld strength and impact flexibility; meanwhile, the manganese being reduced and the S chemical combination in weld seam, form the effect that MnS has played de-S; for this reason, determine that MnO content is at 5-12%.
CaF
2there is the oxygen content that reduces deposited metal when promoting deposited metal purifying reaction, improve anti-pore ability.CaF
2fusing point is lower, can effectively reduce cinder high-temperature viscosity, improves slag fluidity, and improves electric conductivity, improve appearance of weld, and desulfurization has good impact on metal.But, along with CaF
2the increase of the content in solder flux, the composite technology hydraulic performance decline of solder flux.In this invention, evidence CaF
2when 10-20%, there is better effects.
CaO is basic anhydride, plays slag making and improve flux basicity effect in solder flux.CaO is stronger basic anhydride, stronger with the binding ability of S, P, can reduce S, P content in weld metal, and it can effectively improve solder flux Chinese People's Anti-Japanese Military and Political College current capacity, improves weld properties.In the invention of this solder flux, addition is controlled at 2-8%.
K
2o, Na
2o is low degree of ionization oxide, can improve flux basicity, and appropriate content can improve arc stability, and in solder flux, addition is all controlled at 1-2%.
Compared with prior art, the present invention has following beneficial effect:
The invention provides formula and preparation method, the solder flux being prepared from, coordinate the carbon steel weldings such as DT4A, H04E to weld, by the welding procedure of carbon steel strip cladding SAW, whole welding process is stable, and welding bead is good in fusion between mother metal, between welding bead and welding bead, de-slag is easy, welding bead surface forming is attractive in appearance, and weld edge is neat, without weld defects such as undercut, pore, crackles; Described welding quality can meet the requirements of thick-walled pressure vessel to built-up welding carbon steel transition zone such as boiler, nuclear power station.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
embodiment 1
By SiO
236kg, MgO 32kg, Al
2o
312kg, CaF
2the powder of 28kg, CaO 3.0 kg, MnO 6.0 kg is placed in blender, be uniformly mixed after, add 18 kg sodium silicate mixing granulations, then through 150 ℃ of low-temperature bakes, 700 ℃ of high temperature sinterings, screening, make solder flux product.
This solder flux is coordinated to DT4A welding, and (welding composition is by weight percentage: C 0.003, Mn 0.14, Si 0.018, S 0.004, P 0.006, Cr 0.023, Ni 0.020, Al 0.41, Cu 0.005, Ti0.001, surplus is Fe), the Q345E steel plate thick to 40mm carries out submerged arc welding experiment.Welding technological properties is good, and welding process is stable, and between welding bead and welding bead, well, de-slag is easy in fusion, and welding bead surface forming is attractive in appearance, and weld edge is neat, without weld defects such as undercut, pore, crackles.By the relevant regulations in NB/T 47013-2012, undertaken: ultrasonic wave (100%UT), surface infiltration (100%PT) are I level.(laterally, longitudinally) lateral bending (D=4a, a=180 °) by the relevant regulations of GB/T 2653-2008, undertaken, experimental result meets the regulation of NB/T47018.5-2013, and (overlay cladding after bend test on the Extrude Face of sample must not have the arbitrary flaws that is greater than 1.5mm; In melt run, must not there is the arbitrary flaws that is greater than 3mm).Cladding layer chemical composition is by weight percentage: C 0.034, Mn 0.74, Si 0. 42, S 0.006, P 0.011.
This experiment is Q345E with built-up welding mother metal, and its chemical composition is by weight percentage: C 0.15, Mn 1.34, Si 0.18, Cr 0.03, Ni0.01,, Cu 0.02, Ti 0.001, V 0.001, S 0.004, P 0.019, surplus be the impurity of Fe and trace.
embodiment 2
By SiO
233kg, MgO 30kg, Al
2o
313kg, CaF
2the technical pure powder of 10 kg, CaO 3.0 kg, MnO 6.0 kg is placed in blender, be uniformly mixed after, add 18 kg sodium silicate mixing granulations, then through 150 ℃ of low-temperature bakes, 700 ℃ of high temperature sinterings, screening, make solder flux product.
This solder flux is coordinated to special-purpose welding, and (welding composition by weight percentage is: C 0.033, Mn 0.21, Si 0.01, S 0.006, P 0.009, Cr 0.033, Ni 0.021, Cu 0.02, surplus is Fe), the Q345E steel plate thick to 40mm carries out submerged arc welding experiment.Welding technological properties is good, and welding process is stable, and between welding bead and welding bead, well, de-slag is easy in fusion, and welding bead surface forming is attractive in appearance, and weld edge is neat, without weld defects such as undercut, pore, crackles.By the relevant regulations in NB/T 47013-2012, undertaken: ultrasonic wave (100%UT), surface infiltration (100%PT) are I level.(laterally, longitudinally) lateral bending (D=4a, a=180 °) by the relevant regulations of GB/T 2653-2008, undertaken, experimental result meets the regulation of NB/T47018.5-2013, and (overlay cladding after bend test on the Extrude Face of sample must not have the arbitrary flaws that is greater than 1.5mm; In melt run, must not there is the arbitrary flaws that is greater than 3mm).Cladding layer chemical composition is by weight percentage: C 0.056, Mn 0.89, Si 0.44, S 0.006, P 0.012.
This experiment is Q345E with built-up welding mother metal, and its chemical composition is by weight percentage: C 0.15, Mn 1.34, Si 0.18, Cr 0.03, Ni0.01, Cu 0.02, Ti 0.001, V 0.001, S 0.004, P 0.019, surplus are the impurity of Fe and trace.
embodiment 3
By SiO
230kg, MgO 27kg, Al
2o
316kg, CaF
2the technical pure powder of 12 kg, CaO 5.0 kg, MnO 7.0 kg is placed in blender, be uniformly mixed after, add 18 kg sodium silicate mixing granulations, then through 150 ℃ of low-temperature bakes, 700 ℃ of high temperature sinterings, screening, make solder flux product.
This solder flux is coordinated to DT4A welding, and (welding composition is by weight percentage: C 0.003, Mn 0.14, Si 0.018, S 0.004, P 0.006, Cr 0.023, Ni 0.020, Al 0.41, Cu 0.005, Ti0.001, surplus is Fe), the Q345E steel plate thick to 40mm carries out submerged arc welding experiment.Welding technological properties is good, welding process is stable, between welding bead and welding bead, fusion is good, de-slag is easy, welding bead surface forming is attractive in appearance, weld edge is neat, without weld defects such as undercut, pore, crackles, by the relevant regulations in NB/T 47013-2012, is undertaken: ultrasonic wave (100%UT), surface infiltration (100%PT) are I level.(laterally, longitudinally) lateral bending (D=4a, a=180 °) by the relevant regulations of GB/T 2653-2008, undertaken, experimental result meets the regulation of NB/T47018.5-2013, and (overlay cladding after bend test on the Extrude Face of sample must not have the arbitrary flaws that is greater than 1.5mm; In melt run, must not there is the arbitrary flaws that is greater than 3mm).Cladding layer chemical composition is by weight percentage: C 0.038, Mn 0.84, Si 0.43, S 0.006, P 0.010.
This experiment is Q345E with built-up welding mother metal, and its chemical composition is by weight percentage: C 0.15, Mn 1.34, Si 0.18, Cr 0.03, Ni 0.01, Cu 0.02, Ti 0.001, V 0.001, S 0.004, P 0.019, surplus are the impurity of Fe and trace.
Its performance of the every experiment of embodiment 1-3 all meets the specification requirements of thick-walled pressure vessel to built-up welding carbon steel transition zone such as boiler, nuclear power station.
Claims (6)
1. a carbon steel strip cladding SAW solder flux, is characterized in that: described solder flux comprises the component of following percentage by weight:
SiO
2：30-45%；
MgO?：25-35%；
Al
2O
3?：8-20%；
CaF
2?：8-20%；
CaO?：2-8%；
MnO?：5-12%；
Na
2O：1~1.6%；
K
2O：1~1.4%。
2. carbon steel strip cladding SAW solder flux according to claim 1, is characterized in that: described solder flux comprises the component of following percentage by weight:
SiO
2：30~36%；
MgO：27~32%；
Al
2O
3：12~16%；
CaF
2：8~12%；
CaO：3~5%；
MnO：6~8%；
Na
2O：1~1.6%；
K
2O：1~1.4%。
3. carbon steel strip cladding SAW solder flux according to claim 1, is characterized in that: described solder flux comprises the component of following percentage by weight:
SiO
2：33%；
MgO：30%；
Al
2O
3：13%；
CaF
2：10%；
CaO：3.0%；
MnO：8.0%；
Na
2O：1.6%；
K
2O：1.4%。
4. prepare the method for solder flux for carbon steel strip cladding SAW described in claim 1-3 any one for one kind, it is characterized in that comprising the following steps: after each component of solder flux is mixed in proportion, add the binding agent of 15-20% solder flux gross mass to carry out mixing granulation, again through the low-temperature bake of 100-200 ℃ and the high temperature sintering of 600-800 ℃, final sizing goes out the particle of object size, is described carbon steel strip cladding SAW solder flux.
5. the preparation method of solder flux for carbon steel strip cladding SAW according to claim 4, is characterized in that, described binding agent is the combination of a kind of in sodium metasilicate, potassium silicate or two kinds.
6. the preparation method of solder flux for carbon steel strip cladding SAW according to claim 4, is characterized in that, the temperature of described low-temperature bake is 150 ℃; The temperature of described high temperature sintering is 700 ℃.
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| CN201410016872.7A CN103753046A (en) | 2014-01-15 | 2014-01-15 | Welding flux for carbon steel submerged arc strip surfacing and preparation method for welding flux |
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Cited By (9)
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|---|---|---|---|---|
| CN105234590A (en) * | 2015-11-18 | 2016-01-13 | 四川大西洋焊接材料股份有限公司 | SA-508Gr.3Cl.2 steel submerged arc welding agent for nuclear power engineering and special welding wire |
| CN105269179A (en) * | 2015-10-21 | 2016-01-27 | 锦州澳林康天鹅焊材有限公司 | Sintered flux for surfacing with band-electrode of submerged-arc welding |
| CN105345310A (en) * | 2015-11-20 | 2016-02-24 | 四川大西洋焊接材料股份有限公司 | Welding flux for corrosion steel of crude oil tanker oil hold and preparation method |
| CN106392274A (en) * | 2016-12-06 | 2017-02-15 | 武汉天高熔接股份有限公司 | Double-sided forming welding process of FGB process one-sided submerged arc welding |
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| CN106624470A (en) * | 2016-12-15 | 2017-05-10 | 昆山京群焊材科技有限公司 | Preparation method of welding strips and welding fluxes for Nb-containing stainless steel strip electrode electroslag surfacing |
| CN109514130A (en) * | 2018-12-29 | 2019-03-26 | 天津市金桥焊材集团有限公司 | A kind of dedicated submerged arc welding flux of carbon steel strip surfacing and application thereof |
| CN114619171A (en) * | 2022-05-13 | 2022-06-14 | 东北大学 | Pore-resistant smelting flux and preparation method and application thereof |
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