CN106141485A - A kind of high-performance flux-cored wire - Google Patents

A kind of high-performance flux-cored wire Download PDF

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Publication number
CN106141485A
CN106141485A CN201610619229.2A CN201610619229A CN106141485A CN 106141485 A CN106141485 A CN 106141485A CN 201610619229 A CN201610619229 A CN 201610619229A CN 106141485 A CN106141485 A CN 106141485A
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China
Prior art keywords
powder
weight
percentage
cored wire
medicine core
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Pending
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CN201610619229.2A
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Chinese (zh)
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CN106141485A8 (en
Inventor
卢齐元
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Anhui Feihu Welding Industry Co ltd
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Anhui Feihu Welding Industry Co ltd
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Priority to CN201610619229.2A priority Critical patent/CN106141485A/en
Publication of CN106141485A publication Critical patent/CN106141485A/en
Publication of CN106141485A8 publication Critical patent/CN106141485A8/en
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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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

The invention discloses a kind of high-performance flux-cored wire, including mild-carbon steel strip crust and medicine core, wherein, the raw materials by weight of described medicine core includes: titanium dioxide 3 5%, silica 1 5%, calcium carbonate 1 5%, magnesia 1 2%, sodium fluozirconate 1 5%, boron carbide 0.5 3%, zirconium oxide 1 5%, cobalt oxide 0.1 2%, manganese powder 3 12%, nickel powder 1 3%, chromium powder 2 10%, molybdenum powder 0.5 1.5%, vanadium powder 0.5 2%, ferrocerium 0.05 0.5%, tungsten powder 1 5%, copper powder 0.1 0.9%, ferro-boron 1 3%, aluminium powder 0.2 1%, ferrotitanium powder 3 10%, ferrosilicon 2 8%, balance of iron powder.The high-performance flux-cored wire that the present invention proposes, its arc stability, to splash little, the coating obtaining is high with the bond strength of ground, and impact flexibility is good, and anti-cracking performance is excellent, and appearance of weld is attractive in appearance.

Description

A kind of high-performance flux-cored wire
Technical field
The present invention relates to welding wire technology field, particularly relate to a kind of high-performance flux-cored wire.
Background technology
Due to the deposition efficiency higher relative to solid core welding wire, flux-cored wire is widely applied in a lot of fields, than Such as the large scale structure industry such as shipbuilding and ocean engineering, to reduce cost.The species of current flux-cored wire is varied, but in reality Still suffering from powder feeding in the application process of border uneven, unstable, fusing degree is uneven, sprays to gained coating on matrix and combines strong Spending low, the porosity is high, poor toughness, the phenomenon that coating easily ftractures.
Content of the invention
The technical problem existing based on background technology, the present invention proposes a kind of high-performance flux-cored wire, its arc stability, Splashing little, the coating obtaining is high with the bond strength of ground, and impact flexibility is good, and anti-cracking performance is excellent, and appearance of weld is attractive in appearance.
A kind of high-performance flux-cored wire that the present invention proposes, including mild-carbon steel strip crust and medicine core, wherein, described medicine core Raw materials by weight includes: titanium dioxide 3-5%, silica 1-5%, calcium carbonate 1-5%, magnesia 1-2%, fluorine zirconic acid Sodium 1-5%, boron carbide 0.5-3%, zirconium oxide 1-5%, cobalt oxide 0.1-2%, manganese powder 3-12%, nickel powder 1-3%, chromium powder 2- 10%th, molybdenum powder 0.5-1.5%, vanadium powder 0.5-2%, ferrocerium 0.05-0.5%, tungsten powder 1-5%, copper powder 0.1-0.9%, boron Iron 1-3%, aluminium powder 0.2-1%, ferrotitanium powder 3-10%, ferrosilicon 2-8%, balance of iron powder.
Preferably, in the raw material of described medicine core, chromium powder, molybdenum powder, vanadium powder, ferrocerium, the percentage by weight of tungsten powder meet Relationship below: 8.3%≤MCr+MMo+MV+MCe+0.5×MW≤ 11.6%, wherein, MCrRepresent the percentage by weight of chromium powder, MMo Represent the percentage by weight of molybdenum powder, MVRepresent the percentage by weight of vanadium powder, MCeRepresent the percentage by weight of ferrocerium, MWRepresent The percentage by weight of tungsten powder.
Preferably, in the raw material of described medicine core, molybdenum powder, manganese powder, the percentage by weight of ferrotitanium powder meet relationship below: 5%≤MMo+MMn+0.33×MTi≤ 12%, wherein, MMoRepresent the percentage by weight of molybdenum powder, MMnRepresent the weight percent of manganese powder Ratio, MTiRepresent the percentage by weight of ferrotitanium powder.
Preferably, in the raw material of described medicine core, titanium dioxide, silica, zirconium oxide, the weight of cobalt oxide are than for 3.7- 4.2:3-4:2-4:0.8-1.3.
Preferably, the raw materials by weight of described medicine core includes: titanium dioxide the 4.1%th, silica the 3.5%th, carbon Acid calcium the 4.2%th, magnesia the 1.3%th, sodium fluozirconate the 2.3%th, boron carbide the 2.4%th, zirconium oxide the 2.3%th, cobalt oxide the 0.9%th, manganese powder 5%th, nickel powder the 1.5%th, chromium powder the 6%th, molybdenum powder the 1%th, vanadium powder the 1.2%th, ferrocerium the 0.3%th, tungsten powder the 2%th, copper powder the 0.7%th, ferro-boron 2.6%th, aluminium powder the 0.4%th, ferrotitanium powder the 6%th, ferrosilicon the 5%th, balance of iron powder.
Preferably, described titanium dioxide is rutile titanium dioxide.
Preferably, in described magnesia, the content of magnesia is more than 98wt%.
Preferably, the granularity of each raw material of described medicine core is 70-100 mesh.
The loading of high-performance flux for flux-cored wire of the present invention is the 25-32% of welding wire weight.
Each raw material can be put into stir according to conventional flux-cored wire preparation technology by high-performance flux-cored wire of the present invention The machine of mixing mixes, and crust uses mild steel steel band, uses flux-cored wire to produce equipment, obtains through crimping, drawing out.During use Spray distance controls at 90-100mm, and coating layer thickness is 0.1-0.3mm.
In the raw material of high-performance flux for flux-cored wire of the present invention, with the addition of sodium fluozirconate, on the one hand improve welding wire Arc stability, on the other hand its Zr decomposing out can make the crystal grain of deposited metal refine after coordinating with zirconium oxide；Add Chromium powder, molybdenum powder, vanadium iron, ferrocerium and tungsten powder, and control five toatl proportions in system, system defines height Hardness, dystectic hard phase, Dispersed precipitate in the base, can anchoring dislocation, crystal grain thinning, strengthen matrix, it is therefore prevented that body The big defect of the system coefficient of expansion that system causes because of the addition of zirconium oxide and sodium fluozirconate, makes the volumetric expansion of system by certain Obstruction, decrease the pore in system, improve the compactness of gained coating, make coating have excellent wearability, toughness, The content of Reasonable Regulation And Control simultaneously, prevents carbide from preventing the dilution of Cr, Mo while gathering, gives coating lasting strong Degree；It has been simultaneously introduced manganese powder, molybdenum powder and ferrotitanium powder, and has controlled content in system for the three, effectively controlled weld metal Quenching degree, make the quenched and tempered organization of alloy uniformly, refinement, significantly improve toughness and the intensity of weld metal, be greatly lowered The ductile-brittle transition temperature of weld seam, after coordinating with nickel powder, it is therefore prevented that the cracking of coating；Add titanium dioxide, silica, magnesium Sand coordinates, and effectively achieves slag making, improves the toughness of deposited metal, and improve welding processing performance so as to get weldering Seam is smooth, and the stress reducing welding line joint is concentrated, and improves the fatigue strength of weld seam；In calcium carbonate addition system, Ke Yiyou Effect improves the effect of gas shielded in welding process and strengthens blow force of arc, coordinates with sodium fluozirconate, is conducive to improving fusion penetration and weldering The formation of seam, it is to avoid produce do not merge, the defect of slag etc.；In copper powder addition system, coordinate with chromium powder, significantly improve welding wire Atmospheric corrosion resistance.
Detailed description of the invention
Below, by specific embodiment, technical scheme is described in detail.
Embodiment 1
A kind of high-performance flux-cored wire that the present invention proposes, including mild-carbon steel strip crust and medicine core, wherein, described medicine core Raw materials by weight includes: titanium dioxide the 3%th, silica 1 %, calcium carbonate the 5%th, magnesia the 1%th, sodium fluozirconate the 5%th, carbon Change boron the 3%th, zirconium oxide the 5%th, cobalt oxide the 0.1%th, manganese powder the 12%th, nickel powder the 1%th, chromium powder the 10%th, molybdenum powder the 0.5%th, vanadium powder the 2%th, iron Cerium alloy the 0.05%th, tungsten powder the 5%th, copper powder the 0.1%th, ferro-boron the 1%th, aluminium powder the 0.2%th, ferrotitanium powder the 10%th, ferrosilicon the 2%th, balance of iron Powder.
Embodiment 2
A kind of high-performance flux-cored wire that the present invention proposes, including mild-carbon steel strip crust and medicine core, wherein, described medicine core Raw materials by weight includes: titanium dioxide the 5%th, silica the 5%th, calcium carbonate the 1%th, magnesia the 2%th, sodium fluozirconate the 1%th, carbon Change boron the 0.5%th, zirconium oxide the 1%th, cobalt oxide the 2%th, manganese powder the 3%th, nickel powder the 3%th, chromium powder the 2%th, molybdenum powder the 1.5%th, vanadium powder the 0.5%th, iron Cerium alloy the 0.5%th, tungsten powder the 1%th, copper powder the 0.9%th, ferro-boron the 3%th, aluminium powder the 1%th, ferrotitanium powder the 3%th, ferrosilicon the 8%th, balance of iron powder.
Embodiment 3
A kind of high-performance flux-cored wire that the present invention proposes, including mild-carbon steel strip crust and medicine core, wherein, described medicine core Raw materials by weight includes: titanium dioxide the 3.7%th, silica the 3%th, calcium carbonate the 2%th, magnesia the 1.2%th, sodium fluozirconate 3%th, boron carbide the 1%th, zirconium oxide the 4%th, cobalt oxide the 0.8%th, manganese powder the 5.5%th, nickel powder the 1.4%th, chromium powder the 6.2%th, molybdenum powder is the 0.8%th, Vanadium powder the 1.4%th, ferrocerium the 0.2%th, tungsten powder the 2.3%th, copper powder the 0.5%th, ferro-boron the 1.1%th, aluminium powder the 0.35%th, ferrotitanium powder is the 6.3%th, Ferrosilicon the 4.7%th, balance of iron powder.
Embodiment 4
A kind of high-performance flux-cored wire that the present invention proposes, including mild-carbon steel strip crust and medicine core, wherein, described medicine core Raw materials by weight includes: titanium dioxide the 4.2%th, silica the 4%th, calcium carbonate the 3%th, magnesia the 1.6%th, sodium fluozirconate 2%th, boron carbide the 2%th, zirconium oxide the 2%th, cobalt oxide the 1.3%th, manganese powder the 4.6%th, nickel powder the 1.9%th, chromium powder the 5%th, molybdenum powder the 1.1%th, vanadium Powder the 1%th, ferrocerium the 0.31%th, tungsten powder the 1.8%th, copper powder the 0.7%th, ferro-boron the 2.6%th, aluminium powder the 0.65%th, ferrotitanium powder the 5.2%th, silicon Iron the 5.5%th, balance of iron powder.
Embodiment 5
A kind of high-performance flux-cored wire that the present invention proposes, including mild-carbon steel strip crust and medicine core, wherein, described medicine core Raw materials by weight includes: titanium dioxide the 4.1%th, silica the 3.5%th, calcium carbonate the 4.2%th, magnesia the 1.3%th, fluorine zirconic acid Sodium the 2.3%th, boron carbide the 2.4%th, zirconium oxide the 2.3%th, cobalt oxide the 0.9%th, manganese powder the 5%th, nickel powder the 1.5%th, chromium powder the 6%th, molybdenum powder 1%th, vanadium powder the 1.2%th, ferrocerium the 0.3%th, tungsten powder the 2%th, copper powder the 0.7%th, ferro-boron the 2.6%th, aluminium powder the 0.4%th, ferrotitanium powder is the 6%th, Ferrosilicon the 5%th, balance of iron powder；
Wherein, described titanium dioxide is rutile titanium dioxide；In described magnesia, the content of magnesia is more than 98wt%； The granularity of each raw material of described medicine core is 70-100 mesh.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, Any those familiar with the art in the technical scope that the invention discloses, according to technical scheme and Inventive concept equivalent or change in addition, all should cover within protection scope of the present invention.

Claims (8)

1. a high-performance flux-cored wire, it is characterised in that include mild-carbon steel strip crust and medicine core, wherein, described medicine core former Material includes by weight percentage: titanium dioxide 3-5%, silica 1-5%, calcium carbonate 1-5%, magnesia 1-2%, sodium fluozirconate 1-5%, boron carbide 0.5-3%, zirconium oxide 1-5%, cobalt oxide 0.1-2%, manganese powder 3-12%, nickel powder 1-3%, chromium powder 2- 10%th, molybdenum powder 0.5-1.5%, vanadium powder 0.5-2%, ferrocerium 0.05-0.5%, tungsten powder 1-5%, copper powder 0.1-0.9%, boron Iron 1-3%, aluminium powder 0.2-1%, ferrotitanium powder 3-10%, ferrosilicon 2-8%, balance of iron powder.
2. high-performance flux-cored wire according to claim 1, it is characterised in that in the raw material of described medicine core, chromium powder, molybdenum powder, Vanadium powder, ferrocerium, the percentage by weight of tungsten powder meet relationship below: 8.3%≤MCr+MMo+MV+MCe+0.5×MW≤ 11.6%, wherein, MCrRepresent the percentage by weight of chromium powder, MMoRepresent the percentage by weight of molybdenum powder, MVRepresent the weight hundred of vanadium powder Proportion by subtraction, MCeRepresent the percentage by weight of ferrocerium, MWRepresent the percentage by weight of tungsten powder.
3. high-performance flux-cored wire according to claim 1 or claim 2, it is characterised in that in the raw material of described medicine core, molybdenum powder, manganese Powder, the percentage by weight of ferrotitanium powder meet relationship below: 5%≤MMo+MMn+0.33×MTi≤ 12%, wherein, MMoRepresent molybdenum The percentage by weight of powder, MMnRepresent the percentage by weight of manganese powder, MTiRepresent the percentage by weight of ferrotitanium powder.
4. high-performance flux-cored wire according to according to any one of claim 1-3, it is characterised in that in the raw material of described medicine core, Titanium dioxide, silica, zirconium oxide, the weight of cobalt oxide are than for 3.7-4.2:3-4:2-4:0.8-1.3.
5. high-performance flux-cored wire according to according to any one of claim 1-4, it is characterised in that the raw material of described medicine core is by weight Amount percentage includes: titanium dioxide the 4.1%th, silica the 3.5%th, calcium carbonate the 4.2%th, magnesia the 1.3%th, sodium fluozirconate is the 2.3%th, Boron carbide the 2.4%th, zirconium oxide the 2.3%th, cobalt oxide the 0.9%th, manganese powder the 5%th, nickel powder the 1.5%th, chromium powder the 6%th, molybdenum powder the 1%th, vanadium powder 1.2%th, ferrocerium the 0.3%th, tungsten powder the 2%th, copper powder the 0.7%th, ferro-boron the 2.6%th, aluminium powder the 0.4%th, ferrotitanium powder the 6%th, ferrosilicon is the 5%th, Balance of iron powder.
6. high-performance flux-cored wire according to according to any one of claim 1-5, it is characterised in that described titanium dioxide is golden red Stone-type titanium dioxide.
7. high-performance flux-cored wire according to according to any one of claim 1-6, it is characterised in that magnesia in described magnesia Content is more than 98wt%.
8. high-performance flux-cored wire according to according to any one of claim 1-7, it is characterised in that the grain of each raw material of described medicine core Degree is 70-100 mesh.
CN201610619229.2A 2016-07-29 2016-07-29 A kind of high-performance flux-cored wire Pending CN106141485A (en)

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Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106736027A (en) * 2016-12-15 2017-05-31 昆山京群焊材科技有限公司 A kind of 1Cr 0.5Mo V power stations steel-casting repair welding flux-cored wire of extremely low carbon high-purity
CN107127477A (en) * 2017-05-17 2017-09-05 安徽飞弧焊业股份有限公司 A kind of anticracking flux-cored wire
CN107127478A (en) * 2017-05-17 2017-09-05 安徽飞弧焊业股份有限公司 A kind of flux-cored wire
CN107175425A (en) * 2017-05-15 2017-09-19 天长市通联焊业有限公司 One kind has excellent antacid flux-cored wire and preparation method thereof
CN107186381A (en) * 2017-05-17 2017-09-22 安徽飞弧焊业股份有限公司 A kind of cement bin material liner plate flux-cored wire
CN107262965A (en) * 2017-05-17 2017-10-20 安徽飞弧焊业股份有限公司 A kind of flux-cored wire of good toughness
CN107262963A (en) * 2017-05-09 2017-10-20 安徽飞弧焊业股份有限公司 A kind of wear-resisting welding wire with flux core
CN107297584A (en) * 2017-05-17 2017-10-27 安徽飞弧焊业股份有限公司 A kind of wear-resistant anti-loose falls flux-cored wire
CN108620763A (en) * 2018-05-03 2018-10-09 湘潭大学 A kind of high boron flux-cored wire of self-shield open arc
CN109483086A (en) * 2018-12-30 2019-03-19 柳州凯通新材料科技有限公司 A kind of medicine core of abrasion-resistant welding wire
CN110293332A (en) * 2019-06-03 2019-10-01 中冶建筑研究总院有限公司 Alkaline flux-cored wire is used in a kind of high-strength weathering, refractory steel welding
CN111215788A (en) * 2019-12-04 2020-06-02 天津市永昌焊丝有限公司 Titanium type flux-cored wire for 62 kg-grade weathering steel
CN112935626A (en) * 2021-02-07 2021-06-11 天津市金桥焊材集团股份有限公司 Metal powder cored flux-cored wire for welding fire-resistant weathering steel
CN112975197A (en) * 2021-02-24 2021-06-18 天津市金桥焊材集团股份有限公司 Flux-cored wire for surfacing hard surface layer of efficient welding hot forging die
CN112975196A (en) * 2021-02-24 2021-06-18 天津市金桥焊材集团股份有限公司 Flux-cored wire for efficient welding hot forging die surfacing transition layer
CN113001058A (en) * 2021-03-05 2021-06-22 李素坤 Flux-cored wire matched with steel for high heat input welding and application thereof
CN113042927A (en) * 2021-04-22 2021-06-29 西安理工大学 Low alloy steel-stainless steel composite pipe and preparation method thereof
CN113182731A (en) * 2021-05-08 2021-07-30 广西辉煌耐磨技术股份有限公司 High-performance hard-face surfacing flux-cored wire
CN114346514A (en) * 2021-12-30 2022-04-15 西安理工大学 Flux-cored wire capable of enhancing copper/steel interface bonding strength and method
CN117564544A (en) * 2024-01-15 2024-02-20 长春三友汽车部件制造有限公司 Tungsten copper cobalt molybdenum resistance spot welding electrode material and preparation method thereof

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JPH1133777A (en) * 1997-07-17 1999-02-09 Kobe Steel Ltd Flux cored welding wire excellent in rust resistance
CN1923435A (en) * 2006-09-08 2007-03-07 攀钢集团攀枝花钢铁研究院 Pile-up welding flux-cored wire for restoring cold rolling intermediate roller operational layer and method for manufacturing same
CN102091881A (en) * 2009-12-15 2011-06-15 株式会社神户制钢所 Flux-cored wire for stainless steel arc welding
CN101745755A (en) * 2009-12-29 2010-06-23 武汉铁锚焊接材料股份有限公司 Flux cored wire for gas shielded welding of weathering steel
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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106736027A (en) * 2016-12-15 2017-05-31 昆山京群焊材科技有限公司 A kind of 1Cr 0.5Mo V power stations steel-casting repair welding flux-cored wire of extremely low carbon high-purity
CN107262963A (en) * 2017-05-09 2017-10-20 安徽飞弧焊业股份有限公司 A kind of wear-resisting welding wire with flux core
CN107175425A (en) * 2017-05-15 2017-09-19 天长市通联焊业有限公司 One kind has excellent antacid flux-cored wire and preparation method thereof
CN107127477A (en) * 2017-05-17 2017-09-05 安徽飞弧焊业股份有限公司 A kind of anticracking flux-cored wire
CN107127478A (en) * 2017-05-17 2017-09-05 安徽飞弧焊业股份有限公司 A kind of flux-cored wire
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CN113001058B (en) * 2021-03-05 2022-09-20 李素坤 Flux-cored wire matched with steel for high heat input welding and application thereof
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CN113042927A (en) * 2021-04-22 2021-06-29 西安理工大学 Low alloy steel-stainless steel composite pipe and preparation method thereof
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CN114346514B (en) * 2021-12-30 2023-02-10 西安理工大学 Flux-cored wire capable of enhancing copper/steel interface bonding strength and method
CN114346514A (en) * 2021-12-30 2022-04-15 西安理工大学 Flux-cored wire capable of enhancing copper/steel interface bonding strength and method
CN117564544A (en) * 2024-01-15 2024-02-20 长春三友汽车部件制造有限公司 Tungsten copper cobalt molybdenum resistance spot welding electrode material and preparation method thereof
CN117564544B (en) * 2024-01-15 2024-03-26 长春三友汽车部件制造有限公司 Tungsten copper cobalt molybdenum resistance spot welding electrode material and preparation method thereof

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