CN102873468B - High-speed flat fillet weld flux-cored wire and preparation and application thereof - Google Patents
High-speed flat fillet weld flux-cored wire and preparation and application thereof Download PDFInfo
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- CN102873468B CN102873468B CN201210346046.XA CN201210346046A CN102873468B CN 102873468 B CN102873468 B CN 102873468B CN 201210346046 A CN201210346046 A CN 201210346046A CN 102873468 B CN102873468 B CN 102873468B
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Abstract
The invention discloses a high-speed flat fillet weld flux-cored wire for gas shielded welding. The flux-cored wire comprises a carbon steel skin and medicinal powder filled in the carbon steel skin, and is characterized in that the medicinal powder comprises the following components in percentage by weight: 2.5 to 3.5 percent of TiO2, 0.1 to 0.6 percent of ZrO2, 0.05 to 0.25 percent of Al2O3, 0.20 to 0.7 percent of SiO2, 0 to 0.3 percent of MgO, 1.5 to 2.5 percent of Mn, 0.3 to 0.6 percent of Si, 0.08 to 0.4 percent of NaF, 0.3 to 0.5 percent of Mg and Al mixture and the balance of Fe. The flux-cored wire is ultralow in hydrogen content and high in pore resistance and deposition efficiency.
Description
Technical field
The present invention relates to metal solder welding material, specifically refer to a kind of CO
2high speed flat fillet weld flux-cored wire and preparation and application for gas shield.
Background technology
Flux-cored wire is a kind of high-efficiency welding material, there is welding efficiency high, the plurality of advantages such as shorten welding interval, welding technological properties is good, appearance of weld is attractive in appearance, composition is easy to adjust, welding deformation is little is therefore used widely in the during welding for steel structures such as boats and ships, bridge.Adopt common E501-1 flux-cored wire to carry out high speed flat fillet weld and weld the assembled T shape joint of zinc rich primer steel plate, usually there are various weld defects in face of weld, as impression, pore etc.In order to prevent the generation of these weld defects, conventionally need to remove the primer coating of surface of steel plate, or reduce speed of welding.Yet these methods will reduce production efficiency, increase welding cost.
Summary of the invention
The technical problem to be solved in the present invention is the problem of anti-pore ability while solving welding with zinc rich primer T junction angle welding.The invention provides a kind of gas shielded arc welding high speed flat fillet weld flux-cored wire, it has, and anti-gas porosity is excellent, diffusible hydrogen reaches low hydrogen levels, and deposition efficiency is high, and arc stability is good, splashes few, is applicable to the flat fillet weld that yield strength rank is 390MPa steel plate
.
In order to solve the problems of the technologies described above, the invention provides high speed flat fillet weld flux-cored wire for a kind of gas shield, comprise carbon steel crust and be filled in the medicinal powder of the outer intracutaneous of carbon steel, the percentage that described medicinal powder contains following composition and accounts for described flux-cored wire gross weight is:
TiO
22.5 ~ 4.0%; ZrO
20.1 ~ 0.6%; Al
2o
30.05 ~ 0.25%; SiO
20.20 ~ 0.7%; MgO0 ~ 0.3%; Si 0.3 ~ 0.6%; Mn1.5 ~ 2.5%; NaF0.08 ~ 0.4%; Mg, Al mixture 0.3 ~ 0.5%; Fe surplus.
Further, Al in described medicine core
2o
3with MgO sum and TiO
2quality mass ratio (Al
2o
3+ MgO)/TiO
2be 0.05 ~ 0.20.
Further, the percentage by weight that the composition in described mild steel crust accounts for mild steel is: Mn 0.15 ~ 0.4%, Si≤0.025%, C≤0.035%, S≤0.017, P≤0.014%, N≤0.006%.
Further, described in, stating C element mass fraction in the deposited metal of flux-cored wire is 0.04 ~ 0.07%.
Further, the Hydrogen Diffusion in Deposited Metal of described flux-cored wire adopts mercury displacementmethod lower than 5ml/100g().
Further, the cross-sectional diameter of described flux-cored wire is 1.2mm ~ 1.4mm.
The invention provides the method for the above-mentioned flux-cored wire of preparation, step is as follows: use steel band method to produce described flux-cored wire, the docking of O type or O type overlap joint, the outer intracutaneous of making at mild steel steel band is filled the composition of described medicine core, obtains described flux-cored wire after overmolding tube reducing.
The invention provides the application of above-mentioned flux-cored wire in welding, it is characterized in that, for welding the assembled T shape joint fillet weld in the flat position of zinc rich primer steel plate.
Further, the yield strength rank of described steel plate is 390MPa.
Further, above-mentioned flux-cored wire adopts CO when welding
2gas shield.
Further, condition during above-mentioned flux-cored wire welding is: during monofilament weldering, adopt electric current 280 ~ 320 A, and voltage 30 ~ 36 V, speed of welding speed of welding 50 ~ 70cm/min, on band zinc rich primer steel plate, pore is less than 2/2m; During Double Wire Welding, the welding wire that moves ahead adopts 260 ~ 300A, voltage 28 ~ 32V; Rear row welding wire adopts 280 ~ 320A, voltage 30 ~ 36V; Speed of welding is 100 ~ 120cm/min, and on band zinc rich primer steel plate, pore is less than 1/2m.
Mentality of designing of the present invention is as follows:
Adopt TiO
2-ZrO
2-SiO
2slag system, ZrO
2to improving slag, cover very favourable.Control slag former content, and by adjusting the content of each component, make flux-cored wire there is good processing performance under the low condition of slag former content.In medicine core, add a large amount of iron powders, improve its deposition efficiency; And adopt the mode of Mn – Mg – Al – Si combined deoxidation, reduce the oxygen content in weld seam, 0 ℃ of impact flexibility >100J as far as possible.
TiO
2, ZrO
2, Al
2o
3, SiO
2, MgO, NaF be medicine core powder Mineral Component:
TiO
2: regulate slag fusing point and viscosity, improve arc stability and appearance of weld, when addition is less than 2.5%, slag can not cover completely, and appearance of weld is poor, splashes many; When addition surpasses 3.5%, can make appearance of weld variation, de-slag is bad, also easily produces pore.Therefore, addition control is 2.5 ~ 3.5%.
ZrO
2: improve slag fusing point and viscosity, improve slag covering performance, slag can be covered completely and do not occur leaking slag, improve the isogonality of angle welding, make face of weld bright and clean.When being less than 0.1%, addition can not embody above-mentioned feature; When addition is greater than 0.6%, appearance of weld is poor, slag difficult drop-off, and anti-gas porosity is variation also.Therefore addition control is 0.1 ~ 0.6%.
Al
2o
3: improve slag fusing point and viscosity, adjust slag fluidity, when addition is less than 0.05%, can not embody above-mentioned feature; When addition is greater than 0.25%, can make slag fusing point improve, affect slag fluidity, appearance of weld variation.Therefore, addition control is 0.05 ~ 0.25%.
SiO
2: regulate slag fluidity and viscosity, refinement molten drop, reduces and splashes, improves slag covering performance.When addition is less than 0.20%, slag can not cover completely, and appearance of weld and de-slag are all very poor; When addition is greater than 0.7%, can reduce slag fusing point, slag fluidity is too strong, makes angle welding isogonality variation, and therefore, it is 0.20 ~ 0.7% that addition is controlled.
MgO: with ZrO
2act on similarly, improve slag fusing point and viscosity, improve the isogonality of angle welding, and can improve slag gas permeability, reduce deposited metal diffusible hydrogen content.When addition is greater than 0.3%, slag covering performance variation, easily occurs leaking slag phenomenon, also can affect de-slag.Therefore addition control is 0 ~ 0.3%.
NaF: dehydrogenation agent, reduces weld seam diffusible hydrogen content.Addition is dehydrogenation scarce capacity very little time, and weld seam easily produces pore load mould; When addition is too many, spatter and flue dust increase, and the increase of splashing under high-speed welding condition can make weld seam variation, also can reduce slag fusing point, makes slag fluidity variation, covers bad.Therefore, the control of NaF addition is 0.08 ~ 0.4%.
Si is important deoxidier, contains the oxygen content that a certain amount of Si can reduce weld metal in welding wire, improves low-temperature impact toughness, the mobility that regulates molten iron, can not embody above-mentioned feature when addition is less than 0.3%, and while being greater than 0.6%, molten iron becomes sticky, weld strength is too high, and impact flexibility reduces.Therefore be limited to 0.3 ~ 0.6%.
Mg, Al are strong deoxidiers, improve impact flexibility, when addition is less than 0.3%, improve low-temperature impact toughness ability and deoxidizing capacity not enough, while being greater than 0.5% because deoxidation products contains magnesium or aluminum oxide makes the fusing point rising setting rate of slag accelerate to be unfavorable for eliminating and the appearance of weld of weld seam gas.Therefore be limited to 0.3 ~ 0.5%.
Mn is main deoxidier, reduces the oxygen content of weld metal, increases weld metal intensity and crack resistance, improve low-temperature impact toughness, regulate molten iron flow, when addition is less than 1.5%, embody above-mentioned characteristic not enough, while being greater than 2.5%, weld strength is too high, and low-temperature impact toughness reduces.Therefore be limited to 1.5 ~ 2.5%.
C infiltrates in deposited metal, can promote an acicular ferrite to separate out, and control proeutectoid ferrite body burden, thereby crystal grain thinning can not only improve weld metal intensity, can also improve the low-temperature impact toughness of weld metal.In deposited metal, C content is lower than 0.04% time, and it is poor that deposited metal shows as low-temperature impact toughness, or low-temperature impact toughness is unstable; C too high levels in deposited metal, not only makes weld metal strength increase, and Plasticity Decreasing also can make to splash and increase in welding process, affects welding procedure and speed of welding.
Fe is iron powder, improves deposition efficiency, improves conditions at the arc, and surplus adds.
Feature of the present invention is: the flux-cored wire composition proportion adopting, can bring into play to greatest extent the advantage of each component, and porosity resistance ability is excellent, and speed of welding is fast, and deposition efficiency is high.
The invention has the beneficial effects as follows:
1, flux-cored wire deposition efficiency provided by the invention high (deposition efficiency reaches more than 90%), speed of welding is fast, for the ultralow-hydrogen low flux-cored wire with the flat fillet weld of zinc rich primer steel plate, can be used for the steel plate that yield strength rank is 390MPa.
2, determine ZrO
2with the addition of MgO, ZrO
2all can improve slag fusing point with MgO, improve viscosity coefficient of dross, can make the isogonality of angle welding better.ZrO
2can also effectively improve the covering of slag, make face of weld bright and clean; MgO can improve slag gas permeability, highly beneficial to porosity resistance ability.
3, control slag former total amount, make percentage that slag former content accounts for flux-cored wire total amount lower than 4.6%, guaranteeing that flux-cored wire processing performance also has excellent porosity resistance ability in good.
4, the mixture that adds strong deoxidier Mg, Al, has improved the normal temperature impact flexibility of weld seam, is conducive to discharge and the appearance of weld of weld seam gas, and weld seam has good impact flexibility, and 0 ℃ of impact is greater than 100J.
5, control C content in deposited metal well, C can promote an acicular ferrite to separate out, and control proeutectoid ferrite body burden, thereby crystal grain thinning can not only improve weld metal intensity, can also improve the low-temperature impact toughness of weld metal.In deposited metal, C content is lower than 0.04% time, and it is poor that deposited metal shows as low-temperature impact toughness, or low-temperature impact toughness is unstable; C too high levels in deposited metal, not only makes weld metal strength increase, and Plasticity Decreasing also can make to splash and increase in welding process, affects welding procedure and speed of welding.
Accompanying drawing explanation
Fig. 1 is by the T junction with zinc rich primer splicing, and arrow indication is priming paint
Fig. 2 monofilament weldering schematic diagram 1-welding gun
Fig. 3 Double Wire Welding schematic diagram
2-welding gun, 3-welding gun
The specific embodiment
Below in conjunction with specific embodiment, the invention will be further described.
The invention provides 5 embodiment, wherein the formula of embodiment 1 ~ 5 is listed in table 1 and table 2.5 embodiment all have excellent especially welding technological properties: welding arc stablility, splash that few, de-slag is easy, appearance of weld light attractive in appearance, porosity resistance ability be good.
embodiment:
The flux-cored wire of the present embodiment, the composition (TiO of medicine core
2, ZrO
2, Al
2o
3, SiO
2, MgO, NaF, Si, Mg or Al, Mn, Fe) and the degree that accounts for described flux-cored wire gross mass in Table 4.
The preparation method of the present embodiment flux-cored wire: use steel band method to produce flux-cored wire, the docking of O type, the outer intracutaneous filling powder of making at mild steel steel band, filling rate is 14 ~ 14.5%, after overmolding tube reducing, obtaining diameter is the finished product welding wire of 1.2 ~ 1.4mm.
The application of the present embodiment flux-cored wire: adopt CO
2protection, flux-cored wire of the present invention is 25 ℃ of room temperatures, under the condition of relative humidity 80%; during flux-cored wire monofilament weldering of the present invention, adopt electric current 280 ~ 320A, voltage 28 ~ 36V; during welding band zinc rich primer steel plate, speed 50 ~ 70cm/min, T connector tow sides pore meets and is less than 3/2m.
The application of the present embodiment flux-cored wire: adopt CO
2protection, during flux-cored wire Double Wire Welding of the present invention, the welding wire that moves ahead adopts 260 ~ 300A, voltage 28 ~ 32V; Rear row welding wire adopts 280 ~ 320A, voltage 30 ~ 36V; Speed of welding is 100 ~ 120cm/min, and on band zinc rich primer steel plate, pore is less than 3/2m.
In table 1, enumerate slag former composition in the medicine core of embodiment No.1 ~ No.5 and account for the degree % of described flux-cored wire gross mass.In table 2, enumerate alloying component in the medicine core of embodiment No.1 ~ No.5 and account for the degree % of described flux-cored wire gross mass.
The steel crust of flux-cored wire adopts mild steel steel band, and its chemical composition is in Table 3.The chemical composition of medicine core powder and raw material form in Table 4.
Table 1 slag former composition and content
Table 2 alloying component and content
The chemical composition of table 3 steel band (%)
Table 4 medicine core powder forms
effect data
1, the physicochemical property data of the deposited metal after the flux-cored wire welding of embodiment 1 ~ 5 preparation are in Table 5 and table 6.
Table 5 deposited metal mechanical property
Table 6 deposited metal C content
2, the mensuration to deposited metal diffusible hydrogen content, in Table 7.
Table 7 deposited metal diffusible hydrogen content
3, deposition efficiency test
The deposition efficiency of the flux-cored wire that embodiment 1 ~ 5 makes is after measured respectively 92%, 95%, 94%, 92%, 93%.
4, porosity resistance ability test
Respectively the anti-gas porosity of monofilament weldering and Double Wire Welding is checked, welding conditions are in Table 8.Welding 3000 * 500 * 20mm, with the steel plate of zinc rich primer, is spliced into T junction, sees Fig. 1, and the surface shown in arrow is the coated priming paint of zinc rich primer steel plate.Pore quantity is in Table 9.Fig. 2, Fig. 3 are respectively the schematic diagram of monofilament weldering and Double Wire Welding.
Table 8 welding conditions
Table 9 pore quantity
Claims (10)
1. a used for gas shield welding high speed flat fillet weld flux-cored wire, consists of crust and the medicine core that is filled in described outer intracutaneous, it is characterized in that, described crust is mild steel, and the composition that described medicine core contains and the percentage that accounts for described flux-cored wire gross mass thereof are: TiO
22.5 ~ 4.0%; ZrO
20.1 ~ 0.6%; Al
2o
30.05 ~ 0.25%; SiO
20.20 ~ 0.7%; MgO 0 ~ 0.3%; Si 0.3 ~ 0.6%; Mn 1.5 ~ 2.5%; NaF 0.08 ~ 0.4%; Mg, Al mixture 0.3 ~ 0.5%; Fe surplus.
2. used for gas shield welding high speed flat fillet weld flux-cored wire according to claim 1, is characterized in that Al in described medicine core
2o
3with MgO sum and TiO
2mass ratio (Al
2o
3+ MgO)/TiO
2be 0.05 ~ 0.20.
3. flux-cored wire according to claim 1, is characterized in that, the percentage by weight that the composition in described mild steel crust accounts for mild steel is: Mn 0.15 ~ 0.4%, Si≤0.025%, C≤0.035%, S≤0.017, P≤0.014%, N≤0.006%.
4. flux-cored wire according to claim 1, is characterized in that, in the deposited metal of described flux-cored wire, C element mass fraction is 0.04 ~ 0.07%; Adopt mercury displacementmethod, the Hydrogen Diffusion in Deposited Metal of described flux-cored wire is lower than 5ml/100g.
5. flux-cored wire according to claim 1, is characterized in that, the cross-sectional diameter of described flux-cored wire is 1.2mm ~ 1.4mm.
6. the method for the flux-cored wire described in preparation claim 1 ~ 5 any one, it is characterized in that, step is: use steel band method to produce described flux-cored wire, the docking of O type, the outer intracutaneous of making at mild steel steel band is filled the composition of described medicine core, obtains described flux-cored wire after overmolding tube reducing.
7. the application in welding according to the flux-cored wire described in claim 1 ~ 5 any one, is characterized in that, described flux-cored wire is for welding the assembled T shape joint fillet weld in the flat position of zinc rich primer steel plate.
8. the application of flux-cored wire according to claim 7 in welding, is characterized in that, the yield strength rank of described steel plate is 390MPa.
Flux-cored wire according to claim 7 in welding application, it is characterized in that, described flux-cored wire adopts CO in when welding
2gas shield.
10. the application of flux-cored wire according to claim 7 in welding, it is characterized in that, condition during described flux-cored wire welding is: during monofilament weldering, adopt electric current 280 ~ 320 A, voltage 30 ~ 36 V, speed of welding speed of welding 50 ~ 70cm/min, on band zinc rich primer steel plate, pore is less than 2/2m; During Double Wire Welding, the welding wire that moves ahead adopts 260 ~ 300A, voltage 28 ~ 32V, and rear row welding wire adopts 280 ~ 320A, voltage 30 ~ 36V, speed of welding is 100 ~ 120cm/min, and on band zinc rich primer steel plate, pore is less than 1/2m.
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| CN201210346046.XA CN102873468B (en) | 2012-09-18 | 2012-09-18 | High-speed flat fillet weld flux-cored wire and preparation and application thereof |
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Cited By (1)
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| JP6085205B2 (en) * | 2013-03-25 | 2017-02-22 | 株式会社神戸製鋼所 | Flux-cored wire for gas shielded arc welding |
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| CN100462182C (en) * | 2005-11-24 | 2009-02-18 | 武汉铁锚焊接材料股份有限公司 | Carbon steel cored solder wire for gas-shielded arc welding |
| JP4986562B2 (en) * | 2006-10-02 | 2012-07-25 | 株式会社神戸製鋼所 | Flux-cored wire for titania-based gas shielded arc welding |
| CN100515655C (en) * | 2007-08-09 | 2009-07-22 | 武汉铁锚焊接材料股份有限公司 | Low alloy steel flux-cored welding wire for carbon dioxide gas protection welding |
| CN101125399A (en) * | 2007-08-27 | 2008-02-20 | 常州华通焊丝有限公司 | Carbon steel flux-cored wire used for gas shield welding |
| CN100574964C (en) * | 2008-03-14 | 2009-12-30 | 武汉铁锚焊接材料股份有限公司 | A kind of chromium-molybdenum-seel flux welding wire for gas shielded arc welding |
| JP5283993B2 (en) * | 2008-07-09 | 2013-09-04 | 株式会社神戸製鋼所 | Flux-cored wire for titania-based gas shielded arc welding |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104827201A (en) * | 2015-04-07 | 2015-08-12 | 武汉铁锚焊接材料股份有限公司 | No-nickel flux-cored wire and preparation method and application thereof |
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