CN107914097A - High-strength steel gas shield welding flux-cored wire - Google Patents

High-strength steel gas shield welding flux-cored wire Download PDF

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Publication number
CN107914097A
CN107914097A CN201610886904.8A CN201610886904A CN107914097A CN 107914097 A CN107914097 A CN 107914097A CN 201610886904 A CN201610886904 A CN 201610886904A CN 107914097 A CN107914097 A CN 107914097A
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welding
content
gas shield
cored wire
strength steel
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CN201610886904.8A
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张宇
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    • 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
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • B23K35/0266—Rods, electrodes, wires flux-cored
    • 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
    • B23K35/3073—Fe as the principal constituent with Mn as next major 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
    • B23K35/24—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
    • B23K35/308—Fe as the principal constituent with Cr as next major constituent
    • B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
    • 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
    • B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials

Abstract

The present invention relates to a kind of high-strength steel gas shield welding flux-cored wire, it is made of steel crust and core powder, in terms of total weight percent, C 0.04 0.10%, Si 0.3 0.9%, Mn 0.5 2.0%, Cr 5 10%, Ni 5.0 8.0%；In core powder, Mg oxide M gO scaled values are 0.5 3.5%, Ti oxide TiO2 scaled values 2 7%, and MgO/TiO2=0.2 0.8, fluoride scaled value 0.5 1.5, and appropriate arc stabilizer, remaining is iron.Obtained more than weld metal tensile strength 980MPa, is suitable for all-position welding.

Description

High-strength steel gas shield welding flux-cored wire
Technical field
The present invention relates to a kind of gas shield welding welding wire, belong to field of welding material, more particularly to a kind of gas of high-strength steel Protect weldering flux-cored wire.
Background technology
As the maximization of the field structures such as steel pipe, engineering machinery, building, lightweight develop, its demand to high-strength steel It is more and more urgent.At present, 100 feather weight (980MPa) high-strength steel obtains in fields such as steel pipe, engineering machinery and building trades Extensive use.
Be compared to Manual electric welding bar and solid core welding wire, flux-cored wire gas shield welding since welding efficiency can be improved, A large amount of uses are obtained.For the flux-cored wire gas shield welding of 980MPa and above grade high-strength steel, intensity and low is being ensured While warm toughness, how to take into account cool attenuation and all-position welding processing performance is core technology.Due to field construction, Assembly difficulty can be reduced, improve efficiency and quality by reducing preheating temperature；Meanwhile adaptation all-position welding can be reduced to manual welding Rely on, improve welding efficiency.
Up to now, high intensity, high tenacity are had concurrently, low-crackle sensitive (low preheating temperature), adapts to all-position welding Flux-cored wire report is few.
The content of the invention
It is an object of the invention to provide a kind of 980MPa grades of high-strength steel gas shield welding flux-cored wire, in proof strength and low Under the premise of the performance of warm toughness, it is also equipped with good anti-cold crack ability and adapts to all-position welding.
The technology of the present invention overcomes the problem that aforementioned four performance cannot be taken into account：1) lance between high intensity and high tenacity Shield；2) contradiction between high intensity and low-crackle sensitive；3) contradiction between high tenacity and all-position welding performance；4) it is low to split Contradiction between line sensitiveness and all position welding.
Technical key point is described as follows：
A kind of high-strength steel gas shield welding flux-cored wire, is made of steel crust and core powder, in terms of total weight percent, Welding wire contains C 0.04-0.10%, Si 0.3-0.9%, Mn 0.5-2.0%, Cr 5-10%, Ni 5.0-8.0%；Core powder In material, Mg oxide M gO scaled values are 0.5-3.5%, Ti oxides TiO2Scaled value 2-7%, and MgO/TiO2=0.2-0.8, Fluoride scaled value 0.5-1.5, and appropriate arc stabilizer, surplus are iron.
A kind of high-strength steel gas shield welding flux-cored wire, one or more of in the Cu and Mo also containing 0.1-1%.
A kind of high-strength steel gas shield welding flux-cored wire, one kind in core powder also BaO and CaO containing 0.2-2% or More than.
A kind of high-strength steel gas shield welding flux-cored wire, the core powder fluoride also CaF containing 0.5-1%2, and fluoride With oxide ratio=0.2-0.6.
A kind of high-strength steel gas shield welding flux-cored wire, powder packed rate is between 15-25%.
The flux-cored wire, in Ar+2-5%CO2Under gas shield, preheating temperature be less than 50 DEG C, can all-position welding, and make Tensile strength >=the 980MPa, -40 DEG C of ballistic work >=47J of the weld metal obtained.
C：It is mainly used for strengthening weld metal.When its content is less than 0.04%, intensity unobvious are improved；When its content surpasses When 0.10%, carbon equivalent can be increased so as to improve the crack sensitivity of weld metal, while be also unfavorable for low-temperature flexibility control. Therefore preferred content is 0.04-0.10%.
Si：On the one hand it is used to strengthen weld metal, on the one hand for the welding pool deoxidation in welding process.When its content During less than 0.3%, strengthen effect and adjust the sticky effect unobvious of welding slag；When its content is more than 0.9%, a side Face is unfavorable for the low-temperature flexibility of weld metal, while can cause the increase of welding slag amount, be unfavorable for all-position welding.Therefore preferably Content is 0.3-0.9%.
Mn：It is mainly used for strengthening weld metal.When its content is less than 0.5%, it is unknown to improve weld metal intensity effect It is aobvious；When its content is more than 2.0%, it be easy to cause MnS and is mingled with segregation, cause low-temperature flexibility to reduce.Therefore preferred content is 0.5-2.0%.
Cr：Important element in the present invention, is mainly used for strengthening weld metal.Adding purpose is to increase quenching degree using it Characteristic, so that the weld structure based on martensite is obtained, so that it is guaranteed that the high intensity of weld metal.When its content is low When 5%, it is impossible to ensure to obtain martensite microstructure in weld metal；When its content is more than 10%, weld seam can be caused The carbon equivalent of metal is excessive, increases cool attenuation, easily produces cold crack.Therefore preferred content is 5-10%.
Ni：It is the important element in the present invention, is mainly used for toughening weld metal.Mainly utilize its toughening weld metal base Body tissue improves the low-temperature flexibility of weld metal, while also improves the intensity of weld metal.When its content is less than 5%, It improves weld metal low-temperature flexibility effect unobvious；When content is more than 8%, the carbon equivalent of weld metal on the one hand can be caused It is excessive, easily produce cold crack；Also it is unfavorable for cost control at the same time.Therefore preferred content is 5-8%.
In addition, the compound additions of Ni and Cr also determine that weld metal was welding while toughening weld metal is strengthened Phase in version in journey.In weld metal based on martensite, as can there are a certain proportion of retained austenite, on the one hand it can reduce Diffusible hydrogen content, so as to reduce cool attenuation；A part of intensity can be also sacrificed to improve low-temperature flexibility at the same time.
Based on this, Cr contents are between 6-9% in the present invention, and when Ni contents are between 6-7%, effect is more preferable.
Cu：All it is to expand austenitic area element with Ni, is on the one hand to assist Ni to regulate and control weld metal phase in version, and reach Improve the purpose of low-temperature flexibility；At the same time also weld metal intensity is improved using its precipitation strength between 500-700 DEG C.When When its content is less than 0.1%, effect unobvious；When its content is more than 1%, the heat cracking that can increase weld metal is sensitive Property.It is therefore preferable that content is 0.1-1%.
Mo：All it is to expand ferrite area element with Cr, is on the one hand to assist Cr to regulate and control weld metal phase in version, so that While obtaining martensitic matrix tissue, moreover it is possible to obtain a certain proportion of retained austenite, so as to control diffusible hydrogen content, reduce Cold crack is inclined to；On the other hand martensite can be refined, while improves low-temperature flexibility and intensity.When its content is less than 0.1%, by force Change, toughening and the effect unobvious for reducing diffusible hydrogen content；When its content is more than 1.0%, excessive martensite production is easy to cause It is raw, the martensite and retained austenite tissue modulation of seam organization.Therefore preferred content is 0.1-1.0%.
The technical essential of the core powder of flux-cored wire of the present invention is as follows：
Mg oxide M gO scaled values are 0.5-3.5%.Adding purpose is to be better than the deoxidizing capacity of Ti using it, so that will Oxygen content in weld metal is reduced to below 200ppm, otherwise cannot ensure the low-temperature flexibility requirement of weld metal.When it contains When amount is less than 0.5%, reduces weld metal oxygen content and improve low-temperature flexibility unobvious；When its content is more than 3.5%, can make Welding slag basicity is excessive, influences all-position welding processing performance.It is therefore preferable that content is 0.5-3.5%.
Ti oxides TiO2Scaled value is 2.0-7.0%.On the one hand it is complete to improve to improve the effect of arc stiffness using it Position Weldability, on the other hand refines weld metal by the use of its oxide inclusion as weld metal intragranular nucleation particle Martensitic structure.When its content is less than 2.0%, all-position welding ability and effect unobvious are improved；When its content exceedes When 7.0%, it can make it that oxide inclusion quantity is excessive in weld metal, influences the low-temperature flexibility of weld metal, it is therefore preferable that Content is 2.0-7.0%.
MgO/TiO2=0.2-0.8.Both ratios of control have 2 points of considerations：1) weld metal oxygen content is reduced to exist Below 200ppm, so that it is guaranteed that low-temperature flexibility；2) viscosity and slag blanket structure of welding slag are adjusted, so as to meet all-position welding It is required that.When its ratio is less than 0.2%, the oxygen content effect unobvious of weld metal are reduced；When ratio is more than 0.8%, meeting So that welding slag basicity is excessive, viscosity is excessive, influences all-position welding processing performance.It is therefore preferable that content is 0.1-1%.
As content of MgO 1-2.5%, TiO2Content 3.5-5.5%, MgO/TiO2When between=0.4-0.6, effect is more preferable.
Fluoride scaled value 0.5-1.5%.Main purpose is the diffusible hydrogen content reduced in weld metal, and fluoride is welding Connect in electric arc and decompose, and generation hydrogen fluoride is combined with the hydrogen atom in electric arc, so as to reduce diffusible hydrogen content, also reduce at the same time Cool attenuation.When content is less than 0.5%, removal effect unobvious；When content is more than 1.5%, polyfluoride meeting is crossed Deteriorate welding arc stablility, destroy processing performance.It is therefore preferable that content is 0.5-1.5%.
Appropriate arc stabilizer is added, to improve arc stability, to ensure that electric arc can adapt to different welding positions.
Add one or more of in the BaO and CaO of 0.2-2%.On the one hand be using its improve welding slag basicity from And weld metal oxygen content is reduced, to improve low-temperature flexibility；On the other hand it is to be contained using the affinity of Ca and Ba and S to reduce S Amount, forms oxysulfide, and then improves slag structure, improves removability of slag energy, while improving processing performance, also changes It has been apt to welding bead surface quality.When its content is less than 0.2%, effect unobvious；When content is more than 2%, can be formed excessive Oxysulfide, influences surface forming quality.It is therefore preferable that content is 0.2-2.0%.
When its content is between 0.5-1.5, effect is more preferable.
Add the CaF of 0.5-1%2.On the one hand addition fluoride is to improve welding arc stablility, because CaF2It is fluorination One of most effective component of arc stability is improved in thing；On the other hand be reduce weld metal diffusible hydrogen content, while calcium from Son can be combined generation oxysulfide with oxygen, sulphur, improve slag structure, lifting process performance.When content is less than 0.5%, carry High arc stability unobvious；When content is more than 1%, arc stability can be destroyed on the contrary, is unfavorable for all-position welding.Cause This, preferred content is 0.5-1.0%.
Fluoride and oxide ratio 0.2-0.6.Mainly balance welding arc stablility, reduce diffusible hydrogen content, drop Low oxygen content.When ratio is less than 0.2, content of fluoride is too low, and reduction diffusible hydrogen ability is inadequate, easily produces postwelding cold cracking Line, and when oxide is too high, then it can reduce weld metal low-temperature flexibility；When ratio is more than 0.6, when content of fluoride is excessive, Welding arc stablility being reduced on the contrary, and when oxide content is too low, then the oxygen in weld metal cannot be got rid of, to low temperature Toughness is unfavorable.It is therefore preferable that ratio is 0.2-0.6%.
When its content in ratio between 0.3-0.5 when, effect is more preferable.
Powder packed rate is between 15-25%.Welding arc, welding slag are mainly balanced, and metal transfer is with true Protect intensity.
In Ar+2-5%CO2Under gas shield, can all-position welding, and the tensile strength of obtained weld metal >= 980MPa, -40 DEG C of ballistic work >=47J.
Advantages of the present invention and beneficial effect：
1. the weld metal structure that the present invention designs to have obtained martensitic structure and a small amount of remaining entity difficult to understand using Ni-Cr, It ensure that intensity and low-temperature flexibility, also reduce diffusible hydrogen content, so as to take into account anti-cold crack ability；Using MgO and TiO2 Medicinal powder designs, and weld metal oxygen content can be reduced to below 200ppm, it can be ensured that low-temperature flexibility, while also taken into account all positon Welding technological properties；BaO and CaO additions then further improve welding slag structure, enhance removability of slag energy, improve welding bead Surface quality.
2. in Ar+2-5%CO2Under gas shield, can all-position welding, and the tensile strength of obtained weld metal >= 980MPa, -40 DEG C of ballistic work >=47J, connect suitable for the gas shield welding of 100 feather weight (980MPa) above high-strength steel.
Embodiment
Technical scheme is further described below in conjunction with preferred embodiment.
Flux-cored wire is made respectively by above-mentioned technical requirements, and chemical composition is shown in Table 1.Then embodiment 1-8 and contrast are utilized Example 1-4 carries out soldering test, and test parameters is shown in Table 2.
Then processing performance and mechanical property are tested and is counted, the results are shown in Table 3.
Embodiment 1-2：
Soldering test carries out on 50mm thickness HT980 steel plates, carries out vertical-up welding and connects.
Gage of wire is 1.2mm, and chemical composition is shown in Table 1, and welding parameter is shown in Table 2.
The experiment results are shown in Table 3.
Embodiment 3-4：
The HT980 steel pipes of outside diameter 800mm, wall thickness 12mm are selected to carry out circumference butt welding, groove is 30 ° of single side V-type.
Gage of wire is 1.2mm, and chemical composition is shown in Table 1, and other welding parameters are shown in Table 2.
The experiment results are shown in Table 3.
Embodiment 5-6：
Steel plate selects 26mm thickness HT980, carries out T-shaped welding.
Gage of wire is 1.2mm, and chemical composition is shown in Table 1, and other welding parameters are shown in Table 2.
The experiment results are shown in Table 3.
Embodiment 7-8：
Steel plate selects 30mm thickness HT980 steel plates, carries out horizontal butt welding, groove is two-sided 40 ° of V-type.
Gage of wire is 1.2mm, and chemical composition is shown in Table 1, and other welding parameters are shown in Table 2.
The experiment results are shown in Table 3.
Comparative example 1-2：
Soldering test carries out on 50mm thickness HT980 steel plates, carries out vertical-up welding and connects.
Gage of wire is 1.2mm, and chemical composition is shown in Table 1, and welding parameter is shown in Table 2.
The experiment results are shown in Table 3.
Comparative example 3-4：
The HT980 steel pipes of outside diameter 800mm, wall thickness 12mm are selected to carry out circumference butt welding, groove is 30 ° of single side V-type.
Gage of wire is 1.2mm, and chemical composition is shown in Table 1, and other welding parameters are shown in Table 2.
The experiment results are shown in Table 3.
By above-described embodiment, high-strength steel gas shield welding flux-cored wire of the present invention, it is high-strength to solve high-strength steel weld joint The contradiction of degree and high tenacity, and low cool attenuation, all-position welding have been taken into account at the same time, it can be widely applied to more than 980MPa The gas shield welding of grade high-strength steel connects.
1 embodiment flux-cored wire chemical composition (percentage by weight, wt%) of table
2 soldering test parameter of table
3 embodiment welding quality of table
(note：" O " is qualified, and " X " is unqualified).

Claims (5)

  1. A kind of 1. high-strength steel gas shield welding flux-cored wire, it is characterised in that：It is made of steel crust and core powder, with gross weight Percentages, welding wire contain C 0.04-0.10%, Si 0.3-0.9%, Mn 0.5-2.0%, Cr 5-10%, Ni 5.0-8.0%；Core In portion's powder, Mg oxide M gO scaled values are 0.5-3.5%, Ti oxides TiO2Scaled value 2-7%, and MgO/TiO2=0.2- 0.8, fluoride scaled value 0.5-1.5, and appropriate arc stabilizer, surplus are iron.
  2. A kind of 2. high-strength steel gas shield welding flux-cored wire as claimed in claim 1, it is characterised in that：The also Cu containing 0.1-1% One or more of in Mo.
  3. A kind of 3. high-strength steel gas shield welding flux-cored wire as described in claim 1-2, it is characterised in that：Core powder also contains It is one or more of in the BaO and CaO of 0.2-2%.
  4. A kind of 4. high-strength steel gas shield welding flux-cored wire as described in claim 1-3, it is characterised in that：The fluorination of core powder The thing also CaF containing 0.5-1%2, and fluoride and oxide ratio 0.2-0.6.
  5. A kind of 5. high-strength steel gas shield welding flux-cored wire as described in claim 1-4, it is characterised in that：The filling of core powder Rate is between 15-25%.
CN201610886904.8A 2016-10-11 2016-10-11 High-strength steel gas shield welding flux-cored wire Withdrawn CN107914097A (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108838577A (en) * 2018-06-14 2018-11-20 温州大学 A kind of high-strength steel low temperature phase change metal powder type flux-cored wire
CN110722251A (en) * 2019-09-30 2020-01-24 浙江高圣钢结构有限公司 Filling method for gap between steel plates
EP3666452A1 (en) * 2018-12-12 2020-06-17 Hobart Brothers LLC Improved crack-resistant wire electrode containing added sulfur source and magnesium oxide

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108838577A (en) * 2018-06-14 2018-11-20 温州大学 A kind of high-strength steel low temperature phase change metal powder type flux-cored wire
EP3666452A1 (en) * 2018-12-12 2020-06-17 Hobart Brothers LLC Improved crack-resistant wire electrode containing added sulfur source and magnesium oxide
CN111482732A (en) * 2018-12-12 2020-08-04 霍伯特兄弟有限责任公司 Improved crack resistant wire electrode containing added sulfur source and magnesium oxide
CN110722251A (en) * 2019-09-30 2020-01-24 浙江高圣钢结构有限公司 Filling method for gap between steel plates
CN110722251B (en) * 2019-09-30 2021-10-26 浙江高圣钢结构有限公司 Filling method for gap between steel plates

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Application publication date: 20180417