KR100331959B1 - Basic type flux cored wire - Google Patents
Basic type flux cored wire Download PDFInfo
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- KR100331959B1 KR100331959B1 KR1019990064392A KR19990064392A KR100331959B1 KR 100331959 B1 KR100331959 B1 KR 100331959B1 KR 1019990064392 A KR1019990064392 A KR 1019990064392A KR 19990064392 A KR19990064392 A KR 19990064392A KR 100331959 B1 KR100331959 B1 KR 100331959B1
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- Prior art keywords
- flux
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- Prior art date
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- 230000004907 flux Effects 0.000 title claims abstract description 33
- -1 carbonate compound Chemical class 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910016036 BaF 2 Inorganic materials 0.000 claims abstract description 5
- 229910004261 CaF 2 Inorganic materials 0.000 claims abstract description 5
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 239000010959 steel Substances 0.000 claims abstract description 3
- 229910001512 metal fluoride Inorganic materials 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 22
- 239000002184 metal Substances 0.000 abstract description 22
- 239000002893 slag Substances 0.000 abstract description 21
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 13
- 239000001257 hydrogen Substances 0.000 abstract description 13
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 150000004649 carbonic acid derivatives Chemical class 0.000 abstract description 3
- 238000003466 welding Methods 0.000 description 20
- 238000007792 addition Methods 0.000 description 8
- 239000011572 manganese Substances 0.000 description 8
- 239000003381 stabilizer Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- BCZZCSPWPQMEQS-UHFFFAOYSA-N carbonic acid hydrofluoride Chemical compound C(O)(O)=O.F BCZZCSPWPQMEQS-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 210000003953 foreskin Anatomy 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000003496 welding fume Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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
- B23K35/02—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
- B23K35/36—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
저수소계 플럭스 충전 와이어가 제공된다.A low hydrogen flux filling wire is provided.
본 발명은 강재 외피내에 플럭스를 충전하여 구성된 플럭스 충전 와이어에 있어서, 상기 와이어에 대한 중량%로 상기 플럭스가, C:0.04~0.08%, CaF2,BaF2,MgF2로 이루어진 금속불화물 그룹중 선택된 1종이상의 성분의 합: 2.0~4.0%, Mn+Si: 2.1~3.5%, CaCO3와 BaCO3로 이루어진 탄산 화합물중 1종이상의 성분의 합: 0.5~1.5%, K2O+Na2O+TiO2:0.05~0.2%, 잔여 철 및 불가피한 불순물을 포함하고, (Mn+Si)/(1종이상의 탄산화합물의 합)으로 정의되는 값이 1.5~5.4로 제어되는 됨을 특징으로 하는 플럭스 충전 와이어에 관한 것이다.The present invention provides a flux-filled wire formed by filling a flux in a steel shell, wherein the flux is selected from the group consisting of C: 0.04-0.08%, CaF 2 , BaF 2 , and MgF 2 by weight% of the wire. Sum of at least one component: 2.0 to 4.0%, Mn + Si: 2.1 to 3.5%, sum of at least one component of the carbonate compound consisting of CaCO 3 and BaCO 3 : 0.5 to 1.5%, K 2 O + Na 2 O + TiO 2 : Flux charge, characterized in that the value defined as (Mn + Si) / (sum of one or more carbonates) is controlled from 1.5 to 5.4, containing 0.05 to 0.2%, residual iron and inevitable impurities It is about a wire.
본 발명의 플럭스 충전 와이어는 슬래그 박리성 및 아크안정성을 향상시키며 용접금속의 확산성 수소량도 3cc/100g이하로 제어함에 유용하다.The flux filling wire of the present invention improves slag peelability and arc stability and is useful for controlling the amount of diffusible hydrogen of the weld metal to 3cc / 100g or less.
Description
본 발명은 저수소계 플럭스 충전 와이어에 관한 것으로, 보다 상세하게는, 슬래그 박리성 및 아크안정성을 향상시키며 용접금속의 확산성 수소량도 3cc/100g이하로 제어할 수 있는 저수소계 플럭스 충전 와이에 관한 것이다.The present invention relates to a low hydrogen flux filling wire, and more particularly, to a low hydrogen flux filling wire which improves slag peelability and arc stability and can control the amount of diffusible hydrogen of a weld metal to 3cc / 100g or less. will be.
일반적으로 저수소계 타입 플럭스 충전 와이어는 중,후판의 용접을 위해 사용되고 있는데, 통상 용접시 그 초층에 확산성 수소가스가 다량 발생하여 균열을 유발한다는 문제가 있었다.In general, the low-hydrogen type flux-filled wire is used for welding of the middle and thick plates, but there is a problem that a large amount of diffusible hydrogen gas is generated in the initial layer during welding, causing cracking.
또한, 종전의 산성계 플럭스 충전 와이어는 용접후 응력제거 열처리를 실시하면 과도하게 충격인성이 저하되는 현상이 발생하여 후열처리에 적합하지 않았으며, 탄산가스 용접시 과도한 스파터(spatter)의 발생과 슬래그 박리가 용이하지 않아 생산효율측면에서 문제가 많았다.In addition, the conventional acid-based flux-filled wire has excessive impact toughness when stress-relieving heat treatment is performed after welding, which is not suitable for post-heating treatment, and excessive spatter is generated during carbon dioxide gas welding. Since slag peeling was not easy, there were many problems in terms of production efficiency.
또한, 이러한 와이어는 통상 실리콘, 망간, 알루미늄, 마그네슘, 지르코늄등과 같은 강력한 탈산제를 과도하게 사용하여 내결함성은 확보하였으나 용접금속내 잔류하는 합금성분의 영향으로 건전한 용접부를 얻을 수 없는 문제가 있었으며,혼합가스를 사용할때 슬래그의 포피성이 불량하여 용접금속의 표면이 일정하지 못하여 그 외관이 불량하다는 문제도 아울러 가지고 있었다.In addition, these wires usually use excessively strong deoxidizers such as silicon, manganese, aluminum, magnesium, zirconium, etc. to secure fault resistance, but there is a problem in that sound welds cannot be obtained due to the influence of alloying elements remaining in the weld metal. In addition, when the gas is used, the slag of the slag is poor, the surface of the weld metal is not uniform, and the appearance is also poor.
상기의 문제점들을 해결하기 위한 기술의 일예로 유럽특허 EP0563866 B1이 있다. 상기 특허출원에서는 스래그 형성제로서 불화물 과 탄산복합산화물; 아크 안정제로서 알칼리 금속; 탈산제등으로 구성된 플럭스 충전 와이어를 제시하여 확산성 수소량의 저감등을 꾀하고 있다.An example of a technique for solving the above problems is European Patent EP0563866 B1. In this patent application, as a slag forming agent, fluoride and carbonate complex oxide; Alkali metals as arc stabilizers; A flux filling wire composed of a deoxidizer or the like is proposed to reduce the amount of diffusible hydrogen.
그러나 상기 특허출원에 제시된 와이어는 어느정도 종래의 문제를 해결할 수 있었으나 여전히 용접시 확산성 수소량이 상대적으로 많아질 수 있어 용접금속의 균열발생의 우려가 있을 뿐만아니라 아크안정성에도 많은 문제가 있다. 또한, 슬라그 포피성도 불량하여 건전한 용접부를 신뢰성있게 얻음에는 현실적으로 많은 문제가 있다.However, the wire presented in the patent application has been able to solve the conventional problem to some extent, but the amount of diffusible hydrogen can still be relatively high during welding, not only there is a fear of cracking of the weld metal, but also many problems in arc stability. In addition, the slag foreskin property is also poor and there are many problems in obtaining a healthy weld reliably.
따라서, 본 발명은 상술한 종래기술의 문제점을 해결하기 위한 것으로, 탈산제에 대하여 첨가되는 탄산화합물의 량을 최적화하고 아크안정제를 소정량 첨가하므로써 슬래그 박리성 및 아크안정성을 향상시키며 용접금속의 확산성 수소량도 3cc/100g이하로 제어할 수 있는 저수소계 플럭스 충전 와이어를 제공함을 그 목적으로 한다.Accordingly, the present invention is to solve the problems of the prior art described above, by optimizing the amount of carbonate compound added to the deoxidizer and by adding a predetermined amount of the arc stabilizer to improve slag peelability and arc stability and diffusion of weld metal An object of the present invention is to provide a low-hydrogen flux-filled wire that can control the amount of hydrogen to 3cc / 100g or less.
따라서, 본 발명은, 강재 외피내에 플럭스를 충전하여 구성된 플럭스 충전와이어에 있어서, 상기 와이어에 대한 중량%로 상기 플럭스는, C:0.04~0.08%, CaF2,BaF2,MgF2로 이루어진 금속불화물 그룹중 선택된 1종이상의 성분의 합: 2.0~4.0%, Mn+Si: 2.1~3.5%, CaCO3와 BaCO3로 이루어진 탄산 화합물중 1종이상의 성분의 합: 0.5~1.5%, K2O+Na2O+TiO2:0.05~0.2%, 잔여 철 및 불가피한 불순물을 포함하고, (Mn+Si)/(1종이상의 탄산화합물의 합)으로 정의되는 값이 1.5~5.4로 제어됨을 특징으로 하는 플럭스 충전 와이어를 제공한다.Accordingly, the present invention, in the flux filling wire configured by filling the flux in the steel shell, the weight in the weight% of the wire, the flux is C: 0.04 ~ 0.08%, metal fluoride consisting of CaF 2 , BaF 2 , MgF 2 Sum of at least one component selected from the group: 2.0 to 4.0%, Mn + Si: 2.1 to 3.5%, sum of at least one component of the carbonate compound consisting of CaCO 3 and BaCO 3 : 0.5 to 1.5%, K 2 O + Na 2 O + TiO 2 : 0.05 to 0.2%, containing residual iron and unavoidable impurities, characterized in that the value defined as (Mn + Si) / (sum of one or more carbonates) is controlled to 1.5 ~ 5.4 Provide flux filling wire.
이하, 본 발명을 설명한다.Hereinafter, the present invention will be described.
본 발명은 종래의 저수소계 플럭스 충전 와이어의 문제점인 용접시 슬래그 박리성 및 아크안정성을 해결하기 위하여 탈산제에 대하여 첨가되는 탄산화합물의 량을 최적화하고 아크안정제의 첨가량을 제어함을 그 특징으로 한다. 이하, 구체적인 성분제한사유를 들어 이를 구체적으로 설명한다.The present invention is characterized by optimizing the amount of carbonate compound added to the deoxidizer and controlling the amount of the arc stabilizer to solve slag peelability and arc stability during welding, which is a problem of the conventional low hydrogen flux filling wire. Hereinafter, the specific reason for limiting the ingredients will be described in detail.
먼저, 탄소(C)는 본 발명에서 중요한 제어원소는 아니나 그 함량이 너무 적으면 용접금속의 인장강도가 떨어지고, 과도하면 강도는 상승되나 충격인성이 저하될 수 있다. 따라서 본 발명에서는 탄소의 함량을 와이에 대한 중량%로 0.04~0.08%로 제한한다.First, carbon (C) is not an important control element in the present invention, but if the content is too small, the tensile strength of the weld metal is lowered, and if excessive, the strength is increased but the impact toughness may be lowered. Therefore, in the present invention, the content of carbon is limited to 0.04 to 0.08% by weight of the wye.
CaF2,BaF2,MgF2등과 같은 금속불화물은 용접금속의 확산성 수소가스량을 제어하고 건전한 용접부금속을 얻기 위하여 첨가된다. 본 발명에서는 이들 불화물중 선택된 1종이상의 성분의 합을 와이어에 대한 중량%로 2.0~4.0%내로 제한함이 바람직한데, 이는 그 첨가량이 2.0%미만이면 확산성 수소가스의 발생량이 많아져 균열발생의 우려가 커지고, 4.0%를 초과하면 슬래그 점성이 부족해서 원활한 용접외관을 얻을 수 없을뿐만 아니라 용접작업성이 나빠지기 때문이다.Metal fluorides such as CaF 2 , BaF 2 and MgF 2 are added to control the amount of diffusible hydrogen gas of the weld metal and to obtain a healthy weld metal. In the present invention, it is preferable to limit the sum of at least one component selected from these fluorides to 2.0% to 4.0% by weight of the wire. If the amount is less than 2.0%, the amount of diffused hydrogen gas is increased and cracks are generated. This is because when the concern is increased, and when it exceeds 4.0%, the slag viscosity is insufficient to obtain a smooth welding appearance and the welding workability is deteriorated.
Mn,Si는 강력한 탈산제로서 용접금속의 내결함성확보를 첨가되는데, 본 발명에서는 이들의 첨가량의 합을 와이어에 대한 중량%로 2.1~3.5%로 제한한다. 왜냐하면, 만일 그 첨가량이 2.1%미만이면 탈산이 충분하지 못하여 용접금속에 결함이 발생하여 건전한 용접부를 얻을 수 없으며, 3.5%를 초과하면 인장강도가 증가하고 연신율이 떨어져 충격인성이 열화되기 때문이다.Mn, Si is a strong deoxidizer, which adds the fault resistance of the weld metal. In the present invention, the sum of the added amounts thereof is limited to 2.1 to 3.5% by weight of the wire. This is because if the addition amount is less than 2.1%, deoxidation may not be sufficient and defects may occur in the weld metal, and a healthy weld may not be obtained. If the amount exceeds 3.5%, the tensile strength increases and the elongation decreases, thereby deteriorating impact toughness.
보다 바람직하게는, 첨가되는 Mn과 Si의 량을 1.5~2.3%, 0.6~1.2%로 각각 제한하는 것이다.More preferably, the amounts of Mn and Si added are limited to 1.5 to 2.3% and 0.6 to 1.2%, respectively.
본 발명에서 CaCO3,BaCO3와 같은 탄산화합물은 CO2에 의한 용접금속의 결함발생을 방지하고 슬래그 박리성 향상 및 스파터 발생량 감소를 위해 첨가하는데, 바람직하게는 이들중 1종이상의 성분의 합을 와이어에 대한 중량%로 0.5~1.5%로 제한하는 것이다. 왜냐하면, 만일 그 첨가량이 0.5%미만이면 슬래그의 점성이 떨어져 슬래그가 용접금속을 포피하지 못하여 외관이 불량해지고 슬래그의 유동이 심하게 발생하여 용접이 곤란하며, 1.5%를 초과하면 슬래그의 점성이 강해져서 용접금속 표면과 접착이 과도하게 되어 박리가 불량해지고 스파터발생이 많아지기 때문이다.In the present invention, carbonate compounds such as CaCO 3 and BaCO 3 are added to prevent the generation of defects of the weld metal by CO 2 , to improve slag peelability and to reduce the amount of spatter, and preferably, the sum of one or more of these components. Is limited to 0.5 to 1.5% by weight of the wire. If the added amount is less than 0.5%, the slag's viscosity decreases and the slag fails to envelop the weld metal, so the appearance is poor, the slag flow is severely generated, and the welding is difficult. If the content exceeds 1.5%, the slag's viscosity becomes strong. This is because excessive adhesion to the weld metal surface causes poor peeling and more spatter.
또한, 본 발명에서는 상기와같은 탈산제 및 탄산화합물의 첨가하에서 (Mn+Si)/(탄산화합물의 합)으로 정의되는 값을 1.5~5.4로 제한함이 바람직하다.왜냐하면, 상기 값이 1.5미만이면 탈산이 부족하여 내결함성이 열화될 뿐만아니라 강도 및 충격인성이 나빠지고, 5.4를 초과하면 내결함성은 양호하나 용접성이 열화되며 과도한 강도상승으로 충격인성이 떨어지기 때문이다.Further, in the present invention, it is preferable to limit the value defined as (Mn + Si) / (sum of carbonate compounds) to 1.5 to 5.4 under the addition of the above-described deoxidizer and carbonate compound. This is because not only deoxidation is insufficient, so that the fault resistance is deteriorated, but also the strength and impact toughness are deteriorated.
내결함성, 아크 안정성, 슬래그 박리성 및 스파터 발생량 저감을 위해 보다 바람직하게는, 상기 값을 2.0~4.0범위로 제한하는 것이다.More preferably, the value is limited to the range of 2.0 to 4.0 in order to reduce defect resistance, arc stability, slag peelability and spatter generation.
K2O,Na2O 및 TiO2은 아크안정제로 스파터발생을 감소시키고 아크안정성을 확보하기 위해 첨가되는데, 본 발명에서는 이들의 첨가량의 합을 와이어에 대한 중량%로 0.05~0.2%로 제한한다. 왜냐하면, 만일 그 첨가량이 0.05%미만이면 그 첨가에 따른 효과를 얻을 수 없으며, 0.2%를 초과하면 아크 안정성을 저해하고 아울러 다량의 용접흄이 발생하여 용접성을 저하시킬 수 있기 때문이다.K 2 O, Na 2 O and TiO 2 are added as an arc stabilizer to reduce spatter generation and to ensure arc stability. In the present invention, the total amount of these additions is limited to 0.05 to 0.2% by weight of the wire. do. This is because if the addition amount is less than 0.05%, the effect of the addition cannot be obtained. If the addition amount is more than 0.2%, the arc stability may be inhibited and a large amount of welding fume may be generated to reduce the weldability.
또한, 본 발명에서는 상기 아크 안정제에 추가하여 Li,Ba를 첨가함이 바람직한데, 이때 이들의 첨가량의 합을 상기 와이어에 대한 중량%로 0.02%이내로 제한함이 바람직하다.In addition, in the present invention, it is preferable to add Li, Ba in addition to the arc stabilizer, wherein it is preferable to limit the sum of the added amount to within 0.02% by weight of the wire.
한편, 상기와 같이 마련된 조성을 포함하는 본 발명의 플럭스의 량은 상기 와이어 전체중량에 대하여 10~30%내로 제한함이 바람직한데, 이는 그 량이 10%미만이면 용접시 슬래그 형성이 너무 적고, 30%를 초과하면 슬래그를 과다하게 형성하여 스파터 발생량이 많아져 생산성의 열화를 초래하기 때문이다.On the other hand, the amount of flux of the present invention including the composition prepared as described above is preferably limited to within 10 to 30% with respect to the total weight of the wire, which is less than 10%, the slag formation is too small during welding, 30% This is because excess slag forms excessively, resulting in a large amount of spatter, leading to deterioration in productivity.
상술한 바와같은 조성으로 마련된 본 발명의 플럭스 충전 와이어는 용접시 아크를 안정화시키고 슬라그 박리성도 우수할뿐만 아니라 용접금속내 확산성 수소가스량을 3cc/100g이하로 효과적으로 저감시킬 수 있다.The flux filling wire of the present invention having the composition as described above not only stabilizes the arc during welding, but also has excellent slag peelability, and can effectively reduce the amount of diffusible hydrogen gas in the weld metal to 3cc / 100g or less.
이하, 실시예를 통하여 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail through examples.
(실시예 1)(Example 1)
하기 표 과 같은 플럭스 조성을 각각 마련하였다. 그리고 상기 플럭스 조성들을 이용하여 선경 1.2mm의 용접봉을 제조한 연후, 이들 용접봉을 가스실드 아크용접법으로 두께 15mm의 SS400 용접모재의 용접에 사용하였다. 이때 구체적인 용접조건은 하기 표 2와 같다.The flux composition as shown in the following table was prepared. After the welding rods having a diameter of 1.2 mm were manufactured using the flux compositions, these electrodes were used for welding SS400 welding base material having a thickness of 15 mm by gas shield arc welding. At this time, the specific welding conditions are shown in Table 2 below.
상기와 같은 용접이 있은 연후, 해당 용접봉별 용접성 및 용접금속의 내결함성을 평가하여 하기 표3에 나타내었으며, 아울러 이들 용접금속의 인장강도와 충격인성을 인장시험기와 샤르피 충격시험기를 통해 평가하여 그 결과를 하기 표 3에나타내었다. 여기에서 용접성은 육안비교관찰을 평가하였으며 내결함성은 인장시편의 파단면상의 결함의 정도비교를 통해 평가하였다.After the welding as described above, the weldability of each electrode and the fault resistance of the weld metal is evaluated and shown in Table 3 below, and the tensile strength and impact toughness of these weld metals were evaluated through a tensile tester and a Charpy impact tester. It is shown in Table 3 below. Weldability was evaluated by visual comparison and fault tolerance was evaluated by comparing the degree of defects on the fracture surface of tensile specimen.
* 단, 금속불화물은 CaF2,BaF2,MgF2로 이루어진 그룹중 선택된 1종이상의 성분의 합을 의미하며, 탄산화합물은 CaCO3,BaCO3중 1종이상의 성분의 합을 의미한다.* However, the metal fluoride means the sum of one or more components selected from the group consisting of CaF 2 , BaF 2 and MgF 2 , and the carbonate compound means the sum of one or more components among CaCO 3 and BaCO 3 .
*단, 여기서 ◎는 매우 우수, ○는 양호, △는 보통, ×는 불량을 의미한다.* However, (circle) is very excellent here, (circle) is good, (triangle | delta) is a normal, and x means a defect.
상기 표 3에서 알 수 있는 바와같이, 플럭스의 조성을 소정범위로 제어한 본 발명예(1~8)의 경우 모두 우수한 용접성과 내결함성을 보이며, 아울러 용접부 금속의 기계적물성도 우수함을 알 수 있다. 특히, (Mn+Si)/(탄산화합물의 합)으로 정의되는 값을 2.0~4.0범위내로 제어된 발명예(5~8)이 그렇지 않은 발명예(1~4)에 비하여 슬라그 박리성 및 용접금속의 내결함성측면에서 보다 우수하며, 더불어 용접금속의 기계적 성질도 개선됨을 알 수 있다.As can be seen in Table 3, in the case of Examples 1 to 8 of the present invention in which the composition of the flux is controlled in a predetermined range, all of them show excellent weldability and fault resistance, and also it can be seen that the mechanical properties of the weld metal are excellent. In particular, the invention defined as (Mn + Si) / (sum of carbonate compounds) in the range of 2.0 to 4.0 controlled the slag peelability and the slab peelability and It is better in terms of the fault resistance of the weld metal, and also improves the mechanical properties of the weld metal.
한편, 비교예 1과 2는 금속불화물의 첨가량이 본 발명의 범위를 벗어난 경우로써, 용접성뿐만 아니라 용접금속의 기계적 성질도 열화되었다. 또한, 탄산화합물의 첨가량이 본 발명의 범위를 벗어난 비교예 3과 4의 경우에도 전반적으로 용접성이 나쁨을 알 수 있다.On the other hand, Comparative Examples 1 and 2 are cases where the amount of metal fluoride added is outside the scope of the present invention, and not only weldability but also mechanical properties of the weld metal are deteriorated. Moreover, also in the case of the comparative examples 3 and 4 in which the addition amount of a carbonate compound is out of the range of this invention, it turns out that weldability is generally bad.
그리고 아크안정제의 첨가량이 본 발명의 벗어난 비교예 5와 6의 경우에도 전반적으로 용접성이 열화됨을 알 수 있다.In addition, even in the case of Comparative Examples 5 and 6 in which the amount of the arc stabilizer is deviated from the present invention, weldability is deteriorated as a whole.
한편, 금속불화물, 탄산화합물 및 아크안정제의 첨가량이 본 발명의 범위에 있을 지라도 (Mn+Si)/(탄산화합물의 합)으로 정의되는 값이 본 발명의 범위를 벗어난 비교예 7과 8의 경우, 용접성 및 내균열성측면에서 우수한 결과치를 얻을 수 없음을 알 수 있다.On the other hand, even if the addition amount of the metal fluoride, carbonate compound and arc stabilizer is within the scope of the present invention in the case of Comparative Examples 7 and 8 whose value defined by (Mn + Si) / (sum of carbonate compounds) is outside the scope of the present invention It can be seen that excellent results cannot be obtained in terms of weldability and crack resistance.
상술한 바와같이, 본 발명은 탈산제에 대하여 첨가되는 탄산화합물의 량을 최적화하고 소정량의 아크안정제를 포함하는 플럭스조성을 제공하므로써 용접시 슬래그 박리성과 아크안정성을 향상시키며 용접금속의 확산성 수소량도 3cc/100g이하로 제어할 수 있는 저수소계 플럭스 충전 와이어의 제조에 그 유용한 효과가 있다.As described above, the present invention optimizes the amount of carbonate compound added to the deoxidizer and provides a flux composition including a predetermined amount of arc stabilizer, thereby improving slag peelability and arc stability during welding, and also spreading hydrogen content of the weld metal. There is a useful effect in the production of low-hydrogen flux filling wire that can be controlled to less than 3cc / 100g.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6171198A (en) * | 1984-09-12 | 1986-04-12 | Nippon Steel Corp | Low hydrogen coated arc welding rod |
| JPH05329684A (en) * | 1992-03-31 | 1993-12-14 | Kobe Steel Ltd | Basic flux cored wire for gas shielded arc welding |
| JPH06285683A (en) * | 1993-04-07 | 1994-10-11 | Nippon Steel Corp | Low hydrogen coated electrode |
| JPH10272594A (en) * | 1997-03-28 | 1998-10-13 | Nippon Steel Corp | Low hydrogen type coated electrode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6171198A (en) * | 1984-09-12 | 1986-04-12 | Nippon Steel Corp | Low hydrogen coated arc welding rod |
| JPH05329684A (en) * | 1992-03-31 | 1993-12-14 | Kobe Steel Ltd | Basic flux cored wire for gas shielded arc welding |
| JPH06285683A (en) * | 1993-04-07 | 1994-10-11 | Nippon Steel Corp | Low hydrogen coated electrode |
| JPH10272594A (en) * | 1997-03-28 | 1998-10-13 | Nippon Steel Corp | Low hydrogen type coated electrode |
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