CN104785954A - High-strength and high-tenacity basic flux cored wire - Google Patents

High-strength and high-tenacity basic flux cored wire Download PDF

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Publication number
CN104785954A
CN104785954A CN201510189054.1A CN201510189054A CN104785954A CN 104785954 A CN104785954 A CN 104785954A CN 201510189054 A CN201510189054 A CN 201510189054A CN 104785954 A CN104785954 A CN 104785954A
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China
Prior art keywords
tenacity
cored wire
strength
welding
basic flux
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CN201510189054.1A
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CN104785954B (en
Inventor
古丽平
吴伦发
俞华琴
罗茜
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SHANGHAI WELDING APPLIANCES CO Ltd
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SHANGHAI WELDING APPLIANCES CO Ltd
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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
    • B23K35/24—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
    • 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
    • B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials

Abstract

The invention discloses a high-strength and high-tenacity basic flux cored wire. The high-strength and high-tenacity basic flux cored wire comprises a sheath and a basic flux core with which the sheath is filled. The sheath adopts a mild-carbon steel strip and is obtained through the three working procedures of rolling, folding and drawing. The pH value of the basic flux core ranges from 2.1 to 3.5. The basic flux core comprises, by weight, 3%-7% of ZrO2, 1%-5% of Na2SiF6, 1.5%-6% of KAlSi3O8, 2%-5% of TiO2, 12%-25% of CaF2, 2%-6% of CaCO3, 1%-3% of Al-Mg alloy, 25%-35% of metal powder, and the balance iron powder. During welding of the high-strength and high-tenacity basic flux cored wire, CO2 gas is adopted as protective gas, the welding arc is stable, the amount of spatter and smog is small, deslagging is easy, welding joints are attractive in appearance, the strength of the welding joints can reach more than 830 MPa, the good low-temperature toughness is achieved, and the high-strength and high-tenacity basic flux cored wire is applicable to all-position welding of 830 Mpa grade high-strength steel.

Description

A kind of high-intensity high-tenacity alkaline flux-cored wire
Technical field:
The invention belongs to technical field of welding materials, propose a kind of alkaline flux-cored wire of high-intensity high-tenacity.
Background technology:
Along with socioeconomic development, use the industry of large-scale steel structure, as flourish in building industry, shipbuilding industry, automobile industry etc.It is also more and more higher to the requirement of hardness of steel, and wherein 800-1500MPa high strength steel is used widely.While desired strength is high, to its toughness, especially low-temperature flexibility it is also proposed higher requirement.Therefore for the welding of high strength steel, the research of especially supporting welding material causes the concern of Welder author.The flux-cored wire that Present Domestic uses is main with acid slag, splash less, easily take off slag, arc stability, but weld seam diffusible hydrogen is higher when using solder wire with acidity core to weld.
Current solder wire with acidity core great majority are applicable to the welding of 490MPa and 550MPa rank steel, and crack resistance is poor.For the steel of 800MPa and above intensity rank, require that again it has good low-temperature flexibility, solder wire with acidity core can not meet its requirement.Alkaline flux-cored wire because of its weld seam diffusible hydrogen low, crack resistance at low-temperature is excellent, is widely used in high strength steel structure welding.But splash comparatively large because existing during alkaline flux-cored wire welding, de-slag is more difficult, the shortcomings such as smog is denseer, vertical position welding and horizontal position welding processing performance difference limit application.A kind of alkaline flux-cored wire of high-intensity high-tenacity has been invented in this research, and it has excellent welding technological properties, can carry out all-position welding.
Summary of the invention:
Consider above problem, the object of this invention is to provide a kind of high-intensity high-tenacity low hydrogen flux-cored wire, this flux-cored wire slag system belongs to alkalescence, splashes less, and slag is thin and de-slag easy, and smog is little, and appearance of weld is attractive in appearance, has excellent cracking resistance and low-temperature flexibility.Be applicable to welding 830MPa grade high-strength steel, can carry out putting down, stand, welding in the overhead position connects.
For achieving the above object, the technical solution adopted in the present invention is as follows:
A kind of high-intensity high-tenacity alkaline flux-cored wire, comprise crust and be filled in the alkaline medicine core in crust, its crust adopts mild-carbon steel strip, and make through rolling-close up-drawing three process, it is characterized in that, described alkaline medicine core acid-base value is 2.1-3.5.
In a preferred embodiment of the invention, described alkaline medicine core is prepared from by the raw material of following percentage by weight:
In a preferred embodiment of the invention, described metal dust is prepared from by the raw material of following percentage by weight
In a preferred embodiment of the invention, the diameter of described high-intensity high-tenacity alkaline flux-cored wire is Φ 1.2mm.
In a preferred embodiment of the invention, described TiO 2for rutile TiO 2.
To manufacturing process, welding technological properties and deposited metal composition important, as filling rate is higher, easily there is fracture of wire in flux-cored wire filling rate of the present invention, and during welding, electric arc is unstable in drawing welding wire operation; Filling rate is on the low side, and in deposited metal, chemical composition is less, affects weld properties.Based on above reason, the filling rate of the alkaline medicine core of welding wire of the present invention controls at 12%-18%.
In the present invention, ZrO 2belong to slag former, it can improve the freezing point of slag, and plays stabilising arc effect.
Na in medicine core 2siF 6main Function is dehydrogenation, stabilising arc, but Na 2siF 6during more than 5%, SiF 4, AlF 3gas increases, and causes arc stability to be deteriorated, and splashes and increases.
CaF 2be one of composition improving slag alkalescence, be extremely strong dehydrogenation, deoxidation material, fusing point and the viscosity of slag can be reduced, strengthen the mobility of slag, improve the covering of slag.But when content is more than 25%, welding fume increases, and slag spreadability is deteriorated, and destroys arc stability simultaneously.
TiO 2belong to acidic oxide, can arc stability be improved.TiO in the present invention 2add in the rutile form.
CaCO 3belong to basic anhydride, mainly slag making, gas making, protection molten bath, improves molten drop mobility and slag spreadability, if but addition more than 6%, spatter is comparatively large, and slag covers incomplete.
At KAlSi 3o 8in, main component SiO 2can refinement molten drop, reduce the viscosity of slag.To refinement molten drop and the viscosity DeGrain reducing slag when addition is less than 1.5%, if addition is greater than 6%, welding arc stablility is deteriorated, and splashes and increases.
In the present invention, the Al-Mg alloy added can deoxidation, denitrogenation, avoid produce weld porosity.But the AlN formed after Al denitrogenation belongs to polygon material and is mingled with, unfavorable to raising welding seam toughness, so addition controls within 3%.
In the present invention except adding above-mentioned substance, also add some metal dusts, mainly ferrotianium, molybdenum-iron, ferromanganese, ferrosilicon and crome metal, nickel powder etc., wherein ferromanganese, ferrosilicon can be used as deoxidier on the one hand; Weld strength is improved on the other hand in Mn, Si element transition to weld seam.Remaining can thinning microstructure crystal grain, improve welding seam toughness, especially low-temperature flexibility.
When designing basic slag system flux-cored wire, slag acid-base value B decides the quality of welding wire welding technological properties.If B is too little, weld seam diffusible hydrogen is higher, and B is excessive, and diffusible hydrogen is low, but unfavorable to welding procedure, and as welding arc is unstable, spatter is large.So welding wire acid-base value B of the present invention controls at 2.1-3.5.Acid-base value B computing formula is as follows:
B = CaF 2 + MgO + MnO + K 2 O TiO 2 + SiO 3 + Al 2 O 3 + ZrO 2 .
High-intensity high-tenacity alkaline flux-cored wire of the present invention has excellent welding technological properties, the low-temperature flexibility of higher-strength and excellence, the 830MPa grade high-strength steel used under being applicable to weld low temperature.
Detailed description of the invention
The high-intensity high-tenacity alkaline flux-cored wire of embodiment 1 to embodiment 3, comprise crust and be filled in alkaline medicine core in crust, its crust adopts mild-carbon steel strip, and make through rolling-close up-drawing three process the welding wire that diameter is Φ 1.2mm, last bundling is stand-by.
Each composition proportion of the high-intensity high-tenacity alkaline flux-cored wire neutral and alkali medicine core of embodiment 1 to embodiment 3, the filling rate of alkaline medicine core, acid-base value are in table 1 and table 2.Each composition of alkalescence medicine core is commercially available material.Wherein ZrO 2,na 2siF 6,kAlSi 3o 8purchased from Heng Yun mining company, TiO 2purchased from certain company of Australia, CaF 2purchased from Guangfeng company, CaCO 3purchased from Gao Zi company, Al-Mg alloy is purchased from Shanghai nine ancient cooking vessel, and iron powder is purchased from Zhengzhou wlding company, and ferrotianium, molybdenum-iron, ferromanganese, ferrosilicon, crome metal are purchased from Qidong Jin Zhou company, and nickel powder is purchased from Shanghai nine ancient cooking vessel company.
Table 1 alkaline drug core component proportioning table
Table 2 metal powder constituent proportioning table
Three kinds of welding wires that such scheme is made are at CO 2weld under gas shield, welding technological properties and mechanical property are as following table 3 and table 4:
Table 3 three kinds of welding wire welding process condition
The mechanical property of table 3 three kinds of embodiments
Can find out that from table 3 and table 4 three kinds of welding wires have excellent welding technological properties, the low-temperature flexibility of higher-strength and excellence, the 830MPa grade high-strength steel used under being applicable to weld low temperature.

Claims (5)

1. a high-intensity high-tenacity alkaline flux-cored wire, comprise crust and be filled in alkaline medicine core in crust, its crust adopts mild-carbon steel strip, and make through rolling-close up-drawing three process, it is characterized in that, described alkaline medicine core acid-base value is 2.1-3.5.
2. a kind of high-intensity high-tenacity alkaline flux-cored wire as claimed in claim 1, is characterized in that, described alkaline medicine core is prepared from by the raw material of following percentage by weight:
3. a kind of high-intensity high-tenacity alkaline flux-cored wire as claimed in claim 2, it is characterized in that, described metal dust is prepared from by the raw material of following percentage by weight:
4. a kind of high-intensity high-tenacity alkaline flux-cored wire as claimed in claim 3, is characterized in that, described TiO 2for rutile TiO 2.
5. a kind of high-intensity high-tenacity alkaline flux-cored wire as described in any one of Claims 1-4 claim, is characterized in that, the diameter of described high-intensity high-tenacity alkaline flux-cored wire is Φ 1.2mm.
CN201510189054.1A 2015-04-17 2015-04-17 A kind of high-intensity high-tenacity alkaline flux-cored wire Active CN104785954B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110936060A (en) * 2019-12-11 2020-03-31 天津市永昌焊丝有限公司 Alkaline high-strength steel flux-cored wire
CN112108791A (en) * 2020-08-12 2020-12-22 中国船舶重工集团公司第七二五研究所 Alkaline seamless flux-cored wire for improving low-temperature toughness of low-alloy high-strength steel welding joint
CN112171012A (en) * 2020-09-11 2021-01-05 中交第二公路勘察设计研究院有限公司 U rib inner elevation welding method based on high-viscosity high-toughness flux-cored wire
CN112171108A (en) * 2020-09-11 2021-01-05 中交第二公路勘察设计研究院有限公司 High-viscosity high-toughness flux-cored wire for U-rib internal elevation welding and preparation method thereof

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110936060A (en) * 2019-12-11 2020-03-31 天津市永昌焊丝有限公司 Alkaline high-strength steel flux-cored wire
CN110936060B (en) * 2019-12-11 2021-09-17 天津市永昌焊丝有限公司 Alkaline high-strength steel flux-cored wire
CN112108791A (en) * 2020-08-12 2020-12-22 中国船舶重工集团公司第七二五研究所 Alkaline seamless flux-cored wire for improving low-temperature toughness of low-alloy high-strength steel welding joint
CN112171012A (en) * 2020-09-11 2021-01-05 中交第二公路勘察设计研究院有限公司 U rib inner elevation welding method based on high-viscosity high-toughness flux-cored wire
CN112171108A (en) * 2020-09-11 2021-01-05 中交第二公路勘察设计研究院有限公司 High-viscosity high-toughness flux-cored wire for U-rib internal elevation welding and preparation method thereof
CN112171108B (en) * 2020-09-11 2021-12-17 中交第二公路勘察设计研究院有限公司 High-viscosity high-toughness flux-cored wire for U-rib internal elevation welding and preparation method thereof

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