KR100804274B1 - Submerged arc welding bond flux for high speed welding - Google Patents

Submerged arc welding bond flux for high speed welding Download PDF

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KR100804274B1
KR100804274B1 KR1020030026208A KR20030026208A KR100804274B1 KR 100804274 B1 KR100804274 B1 KR 100804274B1 KR 1020030026208 A KR1020030026208 A KR 1020030026208A KR 20030026208 A KR20030026208 A KR 20030026208A KR 100804274 B1 KR100804274 B1 KR 100804274B1
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welding
slag
flux
weight
submerged arc
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KR20040092681A (en
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장기훈
이병원
류동현
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현대종합금속 주식회사
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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
    • B23K35/22—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
    • B23K35/362—Selection of compositions of fluxes
    • 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
    • B23K35/3601—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
    • B23K35/3603—Halide salts
    • B23K35/3605—Fluorides
    • 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
    • B23K35/3607—Silica or silicates
    • 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
    • B23K35/3608—Titania or titanates
    • 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
    • B23K35/361—Alumina or aluminates

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

연강 및 50Kg/㎟급 고장력강의 서브머지드 아크 용접용 소결형 플럭스가 제공된다.Sintered flux for submerged arc welding of mild steel and 50 Kg / mm2 high tensile steel is provided.

본 발명의 서브머지드 아크 용접용 소결형 플럭스는, 중량%로, SiO2: 8~20％, Al2O3: 25~49％, TiO2: 12~31％, MgO: 2~10％, CaF2: 6~16％, CaO: 2~9％, MnO: 1~7％, CO2: 0.09~0.20% 를 포함하여 조성되고, (MgO+0.4CaO) / CaF2 의 비가 0.5~1.2 로 제어됨을 그 특징으로 한다.The sintered flux for submerged arc welding of the present invention is, by weight%, SiO 2 : 8-20%, Al 2 O 3 : 25-49%, TiO 2 : 12-31%, MgO: 2-10% , CaF 2 : 6-16%, CaO: 2-9%, MnO: 1-7%, CO 2 : 0.09-0.20%, and the composition (MgO + 0.4 CaO) / CaF 2 ratio is 0.5-1.2 It is characterized by being controlled by.

본 발명의 서브머지드 아크 용접용 소결형 플럭스는 고속용접에서의 우수한 용접작업성을 확보하는데 유용하다.The sintered flux for submerged arc welding of the present invention is useful for ensuring excellent welding workability in high speed welding.

서브머지드 아크 용접, 소결형 플럭스, 고속용접, 용접작업성Submerged Arc Welding, Sintered Flux, High Speed Welding, Welding Workability

Description

고속 용접을 위한 서브머지드 아크 용접용 소결형 플럭스{Submerged arc welding bond flux for high speed welding}Submerged arc welding bond flux for high speed welding

본 발명은 고속 용접을 위한 서브머지드 아크 용접용 소결형 플럭스에 관한 것으로, 보다 상세하게는 플럭스 조성을 제어하고 흡습에 민감한 성분의 사용을 제한함과 아울러 특정 성분들의 구성비를 제어함으로써, 내 피트(Pit)성을 확보하고 양호한 비드외관을 얻을 수 있는 연강 및 50Kg/㎟급 고장력강용 서브머지드 아크 용접용 소결형 플럭스에 관한 것이다.The present invention relates to a sintered flux for submerged arc welding for high speed welding, and more particularly to controlling the flux composition and limiting the use of components sensitive to moisture absorption, and controlling the composition ratio of specific components. The present invention relates to a sintered flux for submerged arc welding for mild steel and 50Kg / mm2 high-tensile strength steel which can secure the pit property and obtain a good bead appearance.

일반적으로 서브머지드 아크 용접에 사용되는 플럭스는 그 제조방법에 따라 크게 용융형 플럭스와 소결형 플럭스의 두가지로 구분된다. 용융형 플럭스는 플럭스 원료를 1400℃ 이상의 고온에서 용해, 냉각, 분쇄하여 제조하는 것으로 합금원소의 첨가가 불가능하여 용접금속의 기계적 성질 및 화학성분의 조절이 용이하지 못하며, 용접비드 가장자리에 슬래그가 잔류하는 등 용접작업성이 열등하다는 등의 단점을 가지고 있으나, 제조방법상 유리상의 치밀한 플럭스 입자를 형성하여 흡습이 용이하지 않다는 장점을 가지고 있다. 반면에 소결형 플럭스는 플럭스의 원료를 바인더와 혼합한 후 고온에서 소결하여 제조하는 것으로 합금원소의 첨가로 용접금 속의 기계적 성질 및 화학성분을 조절하는데 용이하며 용접작업성이 우수하다는 등의 장점이 있으나, 대기중의 수분에 의한 흡습이 용이하다는 단점 또한 가지고 있다. 특히 고온다습한 기후조건에서의 소결형 플럭스의 용접은 용접결함을 유발하여 용접품질을 저해하는 중요한 요인 중의 하나이다. In general, the flux used for the submerged arc welding is classified into two types, a molten flux and a sintered flux, depending on the manufacturing method thereof. Melt flux is manufactured by melting, cooling and pulverizing flux raw materials at high temperature above 1400 ℃. It is impossible to add alloying elements, so it is not easy to control the mechanical properties and chemical composition of weld metal. Although it has disadvantages such as inferior welding workability, etc., it has an advantage that the moisture absorption is not easy by forming dense flux particles on the glass. On the other hand, sintered flux is manufactured by mixing the raw material of flux with binder and sintering at high temperature. It is easy to control the mechanical property and chemical composition in the welding metal by adding alloying elements and has excellent welding workability. However, it also has the disadvantage that the moisture absorption in the air is easy. In particular, welding of sintered flux under high temperature and humidity conditions is one of the important factors that cause welding defects and impede welding quality.

그 때문에 근래에는 조선, 압력용기, 철구조물 등의 용접에 널리 사용되고 있는 소결형 플럭스의 단점을 보완하여, 플럭스의 재건조에 따른 부담을 완화하고 용접생산성을 향상시킬 수 있는 새로운 소결형 플럭스가 요구되고 있는 실정이다.
For this reason, in recent years, new sintered fluxes are required to alleviate the disadvantages of sintered fluxes, which are widely used for welding shipbuilding, pressure vessels, and steel structures, thereby mitigating the burden of rebuilding the flux and improving welding productivity. There is a situation.

본 발명은 상기 종래의 소결형 플럭스의 문제점을 보완하기 위한 것으로, 플럭스 조성을 제어하고 흡습에 민감한 성분의 사용을 제한함과 아울러 특정 성분들의 구성비를 제어함으로써, 내 피트(Pit)성을 확보하고 양호한 비드외관을 얻을 수 있는 연강 및 50Kg/㎟급 고장력강용 서브머지드 아크 용접용 소결형 플럭스를 제공하는데, 그 목적이 있다.
The present invention is to supplement the problems of the conventional sintered flux, by controlling the flux composition and limiting the use of components sensitive to moisture absorption, by controlling the composition ratio of the specific components, to ensure a good fit (pit) resistance and good It is an object of the present invention to provide a sintered flux for submerged arc welding for mild steel and 50 Kg / mm 2 high tensile strength steel capable of obtaining a bead appearance.

상기한 목적을 달성하기 위한 본 발명은, 중량%로, SiO2: 8~20％, Al2O3: 25~49％, TiO2: 12~31％, MgO: 2~10％, CaF2: 6~16％, CaO: 2~9％, MnO: 1~7％, CO2: 0.09~0.20% 를 포함하여 조성되고, (MgO+0.4CaO) / CaF2 의 비가 0.5~1.2 로 제어됨을 특징으로 하는 서브머지드 아크 용접용 소결형 플럭스에 관한 것이다.The present invention for achieving the above object, in weight%, SiO 2 : 8-20%, Al 2 O 3 : 25-49%, TiO 2 : 12-31%, MgO: 2-10%, CaF 2 6 to 16%, CaO: 2 to 9%, MnO: 1 to 7%, CO 2 : 0.09 to 0.20%, and the ratio of (MgO + 0.4CaO) / CaF 2 is controlled to 0.5 to 1.2. The present invention relates to a sintered flux for submerged arc welding.

이하, 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail.

먼저, 본 발명의 서브머지드 아크 용접용 소결형 플럭스의 성분 제한사유를 살펴본다.
First, the reasons for the component limitation of the sintered flux for submerged arc welding of the present invention will be described.

SiO2: 8~20중량%SiO 2 : 8-20 wt%

상기 SiO2는 슬래그의 유동성을 제어하여 용착금속 비드의 표면과 형상에 영향을 미치며, 그 성분함량에 따라 슬래그의 염기도에 영향을 미치는 산성 산화물로써, 그 함량을 8~20중량%로 제한하는 것이 바람직하다. 그 이유는 플럭스 전체중량에 대하여 SiO2함량이 8중량％ 미만이면 슬래그의 점도가 너무 높아 슬래그 유동성이 부족하여 비드의 형상이 오목해지는 등 비드폭이 불안정 또는 불균일해지며, 20중량％를 초과하면 슬래그의 유동성이 나빠져 비드폭이 불안정해지고 비드 표면에 슬래그의 잔해 또는 포크마크(Pock mark)가 발생하는 등의 문제가 생길 뿐만 아니라 플럭스 염기도가 떨어져 용접금속 중의 산소량이 증가하여 충격강도를 저하시키기 때문이다.
The SiO 2 is an acidic oxide that affects the surface and shape of the deposited metal beads by controlling the flowability of the slag, and affects the basicity of the slag according to the content of the slag, limiting the content to 8 to 20% by weight. desirable. The reason is that when the SiO 2 content is less than 8% by weight based on the total weight of the flux, the viscosity of the slag is too high, the slag fluidity is insufficient, and the shape of the bead becomes unstable or uneven. This is because the slag fluidity is deteriorated and the bead width becomes unstable and the slag debris or the fork mark is generated on the surface of the bead, as well as the flux basicity is reduced, which increases the amount of oxygen in the weld metal, thereby lowering the impact strength. to be.

Al2O3: 25~49중량% Al 2 O 3 : 25 ~ 49wt%

상기 Al2O3는 슬래그의 연화온도를 상승시킴과 함께 슬래그의 점도 및 응고온도를 조정하여 비드 외관을 양호하게 하면서 용접작업성을 유지하기 위하여 필요한 성분이다. 상기 Al2O3함량이 25중량％ 미만이면 슬래그의 점도 및 응고온도의 상승효과가 충분하지 않아 언더컷(under cut)이 발생하는 등 비드 외관을 나쁘게 하며, 49중량％를 초과하면 슬래그의 점도 및 응고온도가 너무 높게 되어 유동성이 나빠지므로 비드 외관이 불량해지며 슬래그 혼입이 발생하므로, 그 함량을 25~49중량%로 제한하는 것이 바람직하다.
The Al 2 O 3 is a component necessary to maintain the weldability while improving the bead appearance by increasing the softening temperature of the slag and adjusting the viscosity and solidification temperature of the slag. When the Al 2 O 3 content is less than 25% by weight, the effect of synergy of the slag and the solidification temperature is not sufficient, resulting in an undercut, resulting in poor bead appearance, and when the content exceeds 49% by weight, the viscosity of the slag and Since the solidification temperature is too high, the fluidity worsens, the appearance of the beads is poor and the slag is mixed, it is preferable to limit the content to 25 to 49% by weight.

TiO2: 12~31중량%TiO 2 : 12-31 wt%

상기 TiO2는 슬래그 박리성과 아크 안정성을 향상시키고 양호한 비드외관을 얻기 위하여 첨가되는 성분으로써, 그 함량이 12중량% 미만이면 슬래그 박리성이 나빠져 포크마크가 발생하기 쉽고, 31중량%를 초과하는 경우에는 슬래그 박리성은 향상되나 슬래그 점도가 너무 높아 비드 외관이 나빠지게 되고 플럭스 소비량이 증가하는 문제가 있으므로, 그 함량을 12~31중량%로 제한하는 것이 바람직하다.
The TiO 2 is a component added to improve slag peelability and arc stability and obtain a good bead appearance. If the content is less than 12% by weight, the slag peelability is deteriorated, and a fork mark is easily generated. The slag peelability is improved but the slag viscosity is so high that the appearance of the bead is bad and the flux consumption is increased, it is preferable to limit the content to 12 to 31% by weight.

MgO: 2~10중량%MgO: 2-10 wt%

상기 MgO는 용접금속중의 산소량을 저감시켜 용접금속의 인성을 향상시키는 효과가 있으며 슬래그의 융점 및 점도를 조정하여 슬래그 박리성을 확보하는데 유용하지만, 흡습이 용이한 성분이다. 플럭스 중의 상기 MgO함량이 2중량％ 미만이면 상기 효과가 충분하지 않을 뿐만 아니라 비이드 표면에 슬래그가 달라 붙어 박리성이 나빠지게 되며, 10중량％를 초과하게 되면 슬래그 점도가 너무 높아지거나 융점이 너무 상승하므로 슬래그의 유동성이 나빠져 비드 외관이 불량해지며 슬래그 혼입이 발생하기 쉬울 뿐만 아니라 플럭스가 흡습되기 쉬운 문제가 있으므로, 그 함량을 2~10중량%로 제한하는 것이 바람직하다.
The MgO has the effect of reducing the amount of oxygen in the weld metal to improve the toughness of the weld metal and is useful for securing slag peelability by adjusting the melting point and viscosity of the slag, but is an easy moisture absorbing component. If the MgO content in the flux is less than 2% by weight, the effect is not sufficient, and slag adheres to the surface of the bead, resulting in poor peelability, and when it exceeds 10% by weight, the slag viscosity is too high or the melting point is too high. Since the rise of the slag fluidity is worse, the appearance of the bead is poor and the slag is not easily generated, but the flux is easily absorbed, it is preferable to limit the content to 2 to 10% by weight.

CaF2: 6~16중량%CaF 2 : 6-16 wt%

상기 CaF2는 슬래그의 염기도를 높여 용접금속중의 산소량을 저감시키므로 용접금속의 인성을 향상시키는 효과를 가지며, 아크 안정성 및 슬래그 유동성을 조정하고 슬래그의 점도를 높여 비드 형상을 양호하게 하는 효과를 갖는 성분이다. 플럭스중 상기 CaF2함량이 6중량％ 미만이면 상기한 효과가 충분하지 않으며, 16중량％를 초과하면 아크 안정성이 저하되어 슬래그 혼입이 발생하기 쉬워지며 슬래그의 융점이 너무 상승해 슬래그 잔해성, 박리성이 나빠져 비드 외관을 해치므로, 그 함량을 6~16중량%로 제한하는 것이 바람직하다.
The CaF 2 has the effect of improving the toughness of the weld metal by increasing the basicity of the slag to reduce the amount of oxygen in the weld metal, and has the effect of adjusting the arc stability and slag fluidity and increasing the viscosity of the slag to improve the bead shape. Ingredient. If the CaF 2 content in the flux is less than 6% by weight, the above-mentioned effect is not sufficient. If the CaF 2 content is higher than 16% by weight, the arc stability is lowered and slag is easily mixed, and the melting point of the slag is too high. It is preferable that the content is limited to 6 to 16% by weight since the properties deteriorate and damage the appearance of the beads.

CaO: 2~9중량%CaO: 2-9 wt%

상기 CaO는 슬래그의 점도 및 응고온도를 조정하며, 용접금속의 충격강도를 향상시키는 효과가 있지만 내흡습성이 약한 탄산화합물에서 일부 생성되어지는 화합물로서, 첨가량이 2중량％ 미만에서는 첨가에 따른 상기 효과를 얻을 수 없으며, 9중량%를 초과하면 흡습에 민감해질 뿐만 아니라 슬래그의 박리성이 현저하게 나빠지므로, 그 함량을 2~9중량%로 제한하는 것이 바람직하다.
The CaO is a compound that is partially produced from a carbonate compound that adjusts the viscosity and solidification temperature of the slag and improves the impact strength of the weld metal, but is weak in hygroscopicity. If not more than 9% by weight is not only sensitive to moisture absorption, but also the peelability of the slag is significantly worse, it is preferable to limit the content to 2 to 9% by weight.

MnO: 1~7중량%MnO: 1-7 wt%

상기 MnO는 비드 가장자리의 균질성을 양호하게 하며 용접금속의 충격강도를 향상시키는 효과를 갖는 성분으로, 함량이 1중량％ 미만이면 상기 효과가 충분하지 않으며, 7중량％를 초과하면 용융지의 환원반응이 격렬해져 비드 외관이 불량해지거나 슬래그 박리성이 현저하게 나빠지므로, 그 함량을 1~7중량%로 제한하는 것이 바람직하다.
The MnO is a component having an effect of improving the homogeneity of the bead edge and improving the impact strength of the weld metal. If the content is less than 1% by weight, the effect is not sufficient. It is preferable that the content is limited to 1 to 7% by weight because it is violated and the appearance of the beads becomes poor or the slag peelability is significantly worsened.

CO2: 0.09~0.20중량% CO 2 : 0.09 ~ 0.20% by weight

상기 CO2 는 아크 분위기 중의 수소 분압을 낮추며, 이에 따라 용접금속중의 수소량이 낮아져 슬래그의 염기도를 상승시킴으로써 저온충격강도를 상승시키는 역할을 한다. 플럭스내 상기 CO2의 함량이 0.20중량%를 초과하면 아크가 불안정해지고 슬래그 유동성이 나빠져 비드외관이 열화될 뿐만 아니라 포크마크와 같은 용접결함이 발생하기 쉬우므로, 그 함량을 0.20중량% 이하로 제한하는 것이 바람직하다.
The CO 2 lowers the partial pressure of hydrogen in the arc atmosphere, thereby lowering the amount of hydrogen in the weld metal, thereby increasing the basicity of the slag, thereby increasing the low temperature impact strength. When the content of CO 2 in the flux exceeds 0.20% by weight, the arc becomes unstable and slag fluidity deteriorates, leading to deterioration of the appearance of the beads and the likelihood of welding defects such as fork marks. Therefore, the content is limited to 0.20% by weight or less. It is desirable to.

상기한 성분 이외에도 그 밖의 잔여성분으로 본 발명의 플럭스 특성에는 크게 영향을 미치지 않지만, 플럭스를 적당한 크기의 입자로 만드는데 사용되는 고착 제(binder)로부터 첨가되는 Na2O, 염기성산화물로서 용접금속의 충격강도를 향상시키는 효과를 갖는 FeO 등이 플럭스에 추가로 함유될 수 있다.
In addition to the components mentioned above, other residual components do not significantly affect the flux properties of the present invention, but the impact of the weld metal as Na 2 O and basic oxides added from a binder used to make the flux into particles of a suitable size FeO and the like having an effect of improving the strength may be further contained in the flux.

본 발명의 플럭스는 상술한 조성뿐만 아니라 (MgO+0.4CaO)/CaF2의 비를 일정범위내로 제어함을 그 특징으로 한다.The flux of the present invention is characterized by controlling not only the above-mentioned composition but also the ratio of (MgO + 0.4CaO) / CaF 2 within a certain range.

상세하게 설명하면, MgO나 CaO는 슬래그의 용융온도를 상승시킴과 동시에 점도를 높여 용접비드의 형상을 개선하고 슬래그 박리성을 향상시키며 용접금속 중의 산소량을 저감시켜 인성을 올리는데 유효한 성분이다. 하지만, 상기 두 성분은 용융온도를 상승시켜서 용접비드의 폭을 좁게하고, 표면을 거칠게 하기 때문에, 슬래그의 용융온도를 낮추기 위해서는 낮은 융점의 화합물인 CaF2를 적정량 첨가하여 적정한 점도를 유지하여야만 최적의 용접작업성을 얻을 수 있는 것이다.In detail, MgO and CaO are effective ingredients for increasing the melting temperature of slag and increasing the viscosity to improve the shape of the weld bead, improve slag peelability, and reduce the amount of oxygen in the weld metal to increase toughness. However, since the two components increase the melting temperature to narrow the width of the weld bead and roughen the surface, in order to lower the melting temperature of the slag, an appropriate amount of CaF 2 , which is a low melting point compound, must be added to maintain an appropriate viscosity. Weldability can be obtained.

상기 (MgO+0.4CaO)/CaF2 비는 0.5~1.2 로 제어하는 것이 바람직한데, 그 이유는 상기 (MgO+0.4CaO)/CaF2 비가 0.5 미만이면 슬래그의 용융온도가 상대적으로 낮아져 점도가 낮아지기 때문에 슬래그 박리성이 떨어지고, 1.2를 초과하면 용융온도가 상승됨에 따라 점도를 증가시켜 용접비드의 폭을 좁게 하고 표면을 거칠게 할 뿐만 아니라 흡습에 민감하게 되어 내피트성 및 내포크마크성이 현저히 떨어져 용접비드 외관을 나쁘게 하기 때문이다.The ratio of (MgO + 0.4CaO) / CaF 2 is preferably controlled to 0.5 to 1.2. The reason is that when the (MgO + 0.4CaO) / CaF 2 ratio is less than 0.5, the melting temperature of the slag is lowered and the viscosity is lowered. Therefore, the slag peelability is inferior, and when the temperature exceeds 1.2, as the melting temperature increases, the viscosity increases, thereby narrowing the width of the weld bead, making the surface rough, and being sensitive to moisture absorption. This is because the appearance of the weld bead is bad.

본 발명에 있어서, Al2O3와 TiO2 함량의 합이 50∼65중량%를 만족하도록 제어 하면 아크 안정성과 슬래그 박리성을 보다 향상시킬 수 있어 보다 바람직하다.In the present invention, if the sum of Al 2 O 3 and TiO 2 content is controlled to satisfy 50 to 65% by weight, the arc stability and slag peelability can be further improved, which is more preferable.

상세하게 설명하면 Al2O3나 TiO2는 슬래그의 용융온도를 상승시킴과 동시에 슬래그의 점도를 조정하여 아크 안정성 및 슬래그의 박리성을 향상시키는데 유효한 성분으로서, 그 합이 플럭스 전체중량에 대하여 50~65중량%를 만족하도록 하면 슬래그의 응고온도가 최적조건으로 조절되어 아크 안정성과 슬래그 박리성이 극도로 향상됨은 물론 비드외관 불량 등의 문제를 최소화할 수 있기 때문이다.
In detail, Al 2 O 3 or TiO 2 is an effective component for increasing the melting temperature of slag and adjusting the viscosity of slag to improve arc stability and slag peelability, the sum of which is 50% based on the total weight of the flux. This is because the solidification temperature of the slag is controlled to the optimum condition by satisfying the ~ 65% by weight, which greatly improves the arc stability and slag peelability and minimizes problems such as poor bead appearance.

이하, 실시예를 통하여 본 발명을 보다 상세하게 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.

[실시예]EXAMPLE

하기 표 1과 같은 성분을 갖는 용접모재에 하기 표 2에 나타난 성분을 갖는 와이어를 이용하여 하기 표 3과 같은 용접조건으로 비드 온 플레이트(Bead on plate)용접을 실시하였다.The bead on plate welding was performed on the welding base material having the components shown in Table 1 below using the wires having the components shown in Table 2 under the welding conditions shown in Table 3 below.

이때 용접에 사용된 플럭스의 각 조성은 하기 표 4와 같다.At this time, each composition of the flux used for welding is shown in Table 4 below.

하기와 같이 마련된 각각의 플럭스를 이용하여 고속용접을 행한 후, 내포크마크성, 내피트성, 슬래그 박리성 및 아크 안정성을 평가하여 그 결과를 하기 표 5와 같이, 매우 양호(◎), 양호(Ｏ),보통(△), 불량(×)으로 나타내었다. After performing high-speed welding using each flux prepared as follows, fork mark resistance, pit resistance, slag peelability and arc stability were evaluated, and the results were as shown in Table 5 below. (O), normal (Δ), and defective (×).                     

모재Base material 두께(mm)Thickness (mm) 성분(중량%)Ingredient (% by weight) CC SiSi MnMn PP SS Fe 및 기타 불순물Fe and other impurities SS400SS400 1212 0.120.12 0.280.28 1.051.05 0.0150.015 0.0070.007 나머지Remainder

와이어경 (mm)Wire diameter (mm) 성분(중량%)Ingredient (% by weight) CC SiSi MnMn PP SS Fe 및 기타 불순물Fe and other impurities 2.42.4 0.120.12 0.030.03 1.941.94 0.0140.014 0.0070.007 나머지Remainder

전류(A)Current (A) 전압(V)Voltage (V) 용접속도 (cm/min)Welding speed (cm / min) 전극electrode 비 고 Remarks 380380 2828 140140 DCRPDCRP Bead on plate용접Bead on plate welding

구 분division 플럭스 조성(중량%)Flux composition (% by weight) (MgO+0.4CaO)/CaF2(MgO + 0.4CaO) / CaF2 SiO2 SiO 2 Al2O3 Al 2 O 3 TiO2 TiO 2 CaF2 CaF 2 MgOMgO MnOMnO CaOCaO CO2 CO 2 기타Etc 발명예    Inventive Example 1One 19.419.4 25.125.1 30.730.7 6.66.6 4.14.1 1.31.3 9.09.0 0.110.11 잔여분Residual 1.171.17 22 8.58.5 41.841.8 13.513.5 14.414.4 9.99.9 3.93.9 2.22.2 0.090.09 잔여분Residual 0.750.75 33 14.014.0 45.645.6 15.915.9 7.77.7 2.42.4 6.46.4 4.24.2 0.100.10 잔여분Residual 0.530.53 44 14.914.9 35.735.7 12.612.6 10.510.5 7.87.8 6.86.8 4.84.8 0.120.12 잔여분Residual 0.930.93 55 10.210.2 35.235.2 30.630.6 7.87.8 4.14.1 2.32.3 3.43.4 0.090.09 잔여분Residual 0.700.70 비교예       Comparative example 1One 18.418.4 25.125.1 30.730.7 6.16.1 7.17.1 1.31.3 6.76.7 0.180.18 잔여분Residual 1.601.60 22 14.014.0 44.644.6 15.915.9 11.211.2 2.42.4 6.46.4 2.22.2 0.160.16 잔여분Residual 0.290.29 33 20.720.7 30.530.5 5.55.5 11.311.3 11.711.7 5.75.7 7.67.6 0.190.19 잔여분Residual 1.301.30 44 16.416.4 23.823.8 13.213.2 14.214.2 16.716.7 5.35.3 6.56.5 0.180.18 잔여분Residual 1.361.36 55 11.311.3 31.831.8 19.419.4 7.07.0 7.57.5 7.97.9 9.39.3 0.280.28 잔여분Residual 1.601.60 66 13.313.3 27.727.7 12.212.2 17.617.6 13.613.6 6.56.5 1.81.8 0.070.07 잔여분Residual 0.810.81 77 18.618.6 23.823.8 32.632.6 7.87.8 4.24.2 1.51.5 7.87.8 0.210.21 잔여분Residual 0.940.94 88 10.310.3 50.250.2 8.98.9 14.314.3 7.77.7 3.93.9 1.21.2 0.060.06 잔여분Residual 0.570.57 *잔여분: Na2O, FeO 등* Residue: Na 2 O, FeO, etc.

구분division 내포크마크성Fork Mark Resistance 내피트성Fit resistance 슬래그 박리성Slag peelability 아크안정성Arc stability 발명예   Inventive Example 1One ◎◎ ＯO ◎◎ ◎◎ 22 ＯO ＯO ◎◎ ◎◎ 33 ＯO ◎◎ ◎◎ ◎◎ 44 ＯO ＯO ＯO ＯO 55 ＯO ＯO ◎◎ ＯO 비교예      Comparative example 1One ×× ×× △△ ＯO 22 △△ △△ ×× ＯO 33 ×× △△ ×× ×× 44 ×× ×× △△ △△ 55 ×× △△ ×× △△ 66 △△ △△ ×× △△ 77 ×× △△ △△ △△ 88 △△ △△ ×× ××

상기 표 4 및 표 5로부터 알 수 있는 바와 같이, 그 성분 함량 및 (MgO+0.4CaO)/CaF2의 비가 소정치로 제어된 본 발명예 1∼5는 모두 양호한 용접작업성 및 내피트성을 나타내었으며, 특히 Al2O3와 TiO2 함량의 합이 50~65중량%를 만족하는 발명예 1∼3은 매우 양호한 결과를 나타내었다.As can be seen from Table 4 and Table 5, Examples 1 to 5 of the present invention, in which the component content and the ratio of (MgO + 0.4CaO) / CaF 2 are controlled to predetermined values, all have good weldability and fit resistance. In particular, Inventive Examples 1 to 3, in which the sum of Al 2 O 3 and TiO 2 contents satisfy 50 to 65% by weight, showed very good results.

이에 반하여, 성분 함량 또는 (MgO+0.4CaO)/CaF2의 비가 본 발명범위를 벗어 난 비교예 1~8은 모두 원하는 수준의 용접작업성을 얻을 수 없었다. 그 중 비교예 3, 4, 5는 그 성분 함량과 (MgO+0.4CaO)/CaF2의 비가 본 발명 범위를 벗어난 것이었고, 비교예 6, 7, 8은 (MgO+0.4CaO)/CaF2의 비는 본 발명 범위를 만족하나 일부 성분 함량이 본 발명범위를 벗어난 것이었다. On the contrary, Comparative Examples 1 to 8, in which the component content or the ratio of (MgO + 0.4CaO) / CaF 2 were outside the scope of the present invention, could not all obtain desired workability. Among them, Comparative Examples 3, 4 and 5 were those whose content and ratio of (MgO + 0.4CaO) / CaF 2 were outside the scope of the present invention, and Comparative Examples 6, 7, and 8 were (MgO + 0.4CaO) / CaF 2. The ratio of satisfies the scope of the present invention but the content of some components is outside the scope of the present invention.

특히 비교예 1, 2의 경우는, 그 성분조성은 본 발명범위 이내이나 (MgO+0.4CaO)/CaF2의 비가 본 발명범위를 벗어난 것으로써 고속용접 작업성이 본 발명예와는 확연히 구별됨을 알 수 있었다.
Particularly, in the case of Comparative Examples 1 and 2, the composition of the composition is within the scope of the present invention, but the ratio of (MgO + 0.4CaO) / CaF 2 is out of the scope of the present invention. Could know.

상술한 바와 같이, 본 발명은 플럭스 조성을 제어하고 흡습에 민감한 성분의 사용을 제한함과 아울러 특정 성분들의 구성비를 제어함으로써, 고속 서브머지드 아크 용접시에 내 피트(Pit)성 및 아크 안정성을 확보하고 양호한 비드외관을 얻을 수 있는 연강 및 50Kg/㎟급 고장력강용 서브머지드 아크 용접용 소결형 플럭스를 제공하는 효과가 있다.As described above, the present invention controls the composition of the flux, restricts the use of moisture-sensitive components, and controls the composition ratio of specific components, thereby ensuring fit resistance and arc stability during high speed submerged arc welding. There is an effect of providing a sintered flux for submerged arc welding for mild steel and 50 Kg / mm 2 high tensile steel, which can obtain a good bead appearance.

Claims (2)

중량%로, SiO2: 8~20％, Al2O3: 25~49％, TiO2: 12~31％, MgO: 2~10％, CaF2: 6~16％, CaO: 2~9％, MnO: 1~7％, CO2: 0.09~0.20% 를 포함하여 조성되고, (MgO+0.4CaO) / CaF2 의 비가 0.5~1.2 로 제어됨을 특징으로 하는 고속 용접을 위한 서브머지드 아크 용접용 소결형 플럭스.By weight%, SiO 2: 8 ~ 20 %, Al 2 O 3: 25 ~ 49%, TiO 2: 12 ~ 31%, MgO: 2 ~ 10%, CaF 2: 6 ~ 16%, CaO: 2 ~ 9 %, MnO: 1 to 7%, CO 2 : 0.09 to 0.20%, and the ratio of (MgO + 0.4CaO) / CaF 2 is controlled to be 0.5 to 1.2. Sintered flux for welding. 제1항에 있어서, Al2O3와 TiO2 함량의 합이 50~65중량%인 것을 특징으로 하는 고속 용접을 위한 서브머지드 아크 용접용 소결형 플럭스.The sintered flux for submerged arc welding for high speed welding according to claim 1, wherein a sum of Al 2 O 3 and TiO 2 content is 50 to 65% by weight.
KR1020030026208A 2003-04-25 2003-04-25 Submerged arc welding bond flux for high speed welding KR100804274B1 (en)

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