KR101286501B1 - Flux for submerged arc welding - Google Patents

Flux for submerged arc welding Download PDF

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KR101286501B1
KR101286501B1 KR1020110142720A KR20110142720A KR101286501B1 KR 101286501 B1 KR101286501 B1 KR 101286501B1 KR 1020110142720 A KR1020110142720 A KR 1020110142720A KR 20110142720 A KR20110142720 A KR 20110142720A KR 101286501 B1 KR101286501 B1 KR 101286501B1
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flux
slag
tio
comparative example
submerged arc
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KR1020110142720A
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Korean (ko)
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KR20130074593A (en
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한동우
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
    • B23K35/3601—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
    • B23K9/00—Arc welding or cutting
    • B23K9/18—Submerged-arc welding
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

본 발명은 고장력 후판의 다층용접시, 우수한 용접작업성과 용접금속의 우수한 충격인성을 확보할 수 있는 서브머지드 아크용접용 플럭스에 관한 것으로,
중량%로, SiO2: 15~25%, Al2O3: 10~20%, MgO: 20~30%, CaF2: 10~30%, CaO: 10~20%, TiO2+B2O3: 3~5%, 나머지는 불가피한 불순물을 포함하고,
((TiO2+B2O3)/(SiO2+Al2O3+MgO+CaO))×100 의 값이 4.0~7.0을 만족하는 것을 특징으로 하는 서브머지드 아크용접용 플럭스를 제공한다.The present invention relates to a submerged arc welding flux capable of ensuring excellent welding workability and excellent impact toughness of a weld metal during multi-layer welding of a high tension thick plate.
By weight%, SiO 2 : 15-25%, Al 2 O 3 : 10-20%, MgO: 20-30%, CaF 2 : 10-30%, CaO: 10-20%, TiO 2 + B 2 O 3 : 3-5%, the rest contains inevitable impurities,
Provided is a submerged arc welding flux, wherein a value of ((TiO 2 + B 2 O 3 ) / (SiO 2 + Al 2 O 3 + MgO + CaO)) × 100 satisfies 4.0 to 7.0. .

Description

서브머지드 아크용접용 플럭스{FLUX FOR SUBMERGED ARC WELDING}Submerged Arc Welding Flux {FLUX FOR SUBMERGED ARC WELDING}

본 발명은 서브머지드 아크용접용 플럭스에 관한 것으로서, 보다 상세하게는 조선, 해양플랜트 등의 다층용접에 적용될 수 있는 서브머지드 아크용접용 플럭스에 관한 것이다.
The present invention relates to a submerged arc welding flux, and more particularly, to a submerged arc welding flux that can be applied to multilayer welding of shipbuilding, offshore plants and the like.

최근, 전세계적인 천연자원의 고갈 및 유가의 지속적인 상승으로 인해 자원 개발을 위한 해양구조물의 공사가 많아지고 있으며, 특히 극지방 및 한랭지역에서도 많은 구조물들이 건설되고 있다. 이에 따라 해양구조물에 사용되는 강재는 고강도화 및 극후판화 뿐만 아니라, 극저온에서의 충격인성이 확보될 수 있을 것이 요구되고 있다.
Recently, due to the global depletion of natural resources and the continuous increase in oil prices, construction of offshore structures for resource development is increasing, and in particular, many structures are being constructed in polar regions and cold regions. Accordingly, steel materials used in offshore structures are required to be able to secure impact toughness at cryogenic temperatures as well as high strength and ultra-thick plates.

종래에도 플럭스 성분조성을 제어하여 저온에서의 충격인성을 확보하는 서브머지드 아크용접용 플럭스가 제안되었으나, 극저온에서의 충격인성 확보에는 다소 미흡한 경우가 있었고, 또한, 충격인성은 확보되나 용접작업성면에서는 만족스럽지 못한 경우가 많았다.
Conventionally, a submerged arc welding flux has been proposed to control the composition of the flux to secure impact toughness at low temperatures. However, in some cases, it has been somewhat insufficient to secure impact toughness at cryogenic temperatures. Many were not satisfied.

본 발명의 일측면은 조선, 해양플랜트 등에 사용되는 고장력 후판의 다층용접시, 우수한 용접작업성과 용접금속의 우수한 충격인성을 확보할 수 있는 서브머지드 아크용접용 플럭스를 제공하고자 하는 것이다.
One aspect of the present invention is to provide a submerged arc welding flux that can ensure excellent welding workability and excellent impact toughness of weld metal during multi-layer welding of high tension thick plates used in shipbuilding, offshore plants and the like.

본 발명은 중량%로, SiO2: 15~25%, Al2O3: 10~20%, MgO: 20~30%, CaF2: 10~30%, CaO: 10~20%, TiO2+B2O3: 3~5%, 나머지는 불가피한 불순물을 포함하고, In the present invention, by weight%, SiO 2 : 15-25%, Al 2 O 3 : 10-20%, MgO: 20-30%, CaF 2 : 10-30%, CaO: 10-20%, TiO 2 + B 2 O 3 : 3-5%, the remainder contain inevitable impurities,

((TiO2+B2O3)/(SiO2+Al2O3+MgO+CaO))×100 의 값이 4.0~7.0을 만족하는 것을 특징으로 하는 서브머지드 아크용접용 플럭스를 제공한다.
Provided is a submerged arc welding flux, wherein a value of ((TiO 2 + B 2 O 3 ) / (SiO 2 + Al 2 O 3 + MgO + CaO)) × 100 satisfies 4.0 to 7.0. .

본 발명은 플럭스 성분조성을 제어하고 ((TiO2+B2O3)/(SiO2+Al2O3+MgO+CaO))×100 을 적정범위로 제어함으로써, 후판의 다층용접시 양호한 용접작업성과 저온충격인성을 확보할 수 있는 서브머지드 아크용접용 플럭스를 제공하는 효과가 있다.
According to the present invention, the flux composition is controlled and ((TiO 2 + B 2 O 3 ) / (SiO 2 + Al 2 O 3 + MgO + CaO)) × 100 is controlled in an appropriate range, whereby a good welding operation for multilayer welding of a thick plate is performed. It has the effect of providing the submerged arc welding flux which can secure the performance and low temperature impact toughness.

이하, 본 발명에 대해 상세히 설명한다.Hereinafter, the present invention will be described in detail.

먼저, 본 발명의 플럭스 조성에 대해 상세히 설명한다(이하, 중량%).
First, the flux composition of the present invention will be described in detail (hereinafter, by weight).

SiO2 : 15~25%, SiO 2 : 15-25%,

SiO2는 슬래그형성제로서 슬래그의 점성 및 응고온도를 조정하여 비드외관 및 형상, 슬래그의 박리성을 양호하게 하는 역할을 하는 필수적인 성분이다. 본 발명에서는 그 함량을 플럭스 전체중량에 대하여 15~25%로 제한한다. 만일 그 함량이 15%미만이면 슬래그의 점성이 낮아짐에 따라 슬래그 유동성이 증가하여 비드의 균일성이 떨어지고, 또한 비드표면이 거칠어지는 단점이 있다. 반면, 그 함량이 25%를 초과하면 슬래그의 점성이 너무 높아져 비드폭이 불균일해지고, 비드표면에 포크마크가 발생하거나 슬래그 박리성이 떨어지는 등의 문제가 생김은 물론, 염기도가 낮아져 용접금속 중의 산소량 증가로 인한 충격인성 저하를 야기할 수 있다.
SiO 2 is an essential component that plays a role of improving the appearance and shape of the slag and the peelability of the slag by adjusting the viscosity and solidification temperature of the slag as a slag forming agent. In the present invention, the content is limited to 15 to 25% based on the total weight of the flux. If the content is less than 15%, as the viscosity of the slag is lowered, the slag fluidity increases, so that the uniformity of the bead is lowered, and the surface of the bead is rough. On the other hand, if the content exceeds 25%, the slag viscosity becomes so high that the bead width becomes uneven, the fork mark occurs on the surface of the bead, or the slag peelability is poor. It may cause the impact toughness due to the increase.

Al2O3 : 10~20% Al 2 O 3 : 10 ~ 20%

Al2O3는 TiO2 및 MgO와 함께 슬래그의 응고온도와 점도를 높게 함으로써, 슬래그의 박리성을 향상시키며 염기도를 변화시키지 않고 슬래그의 응고온도를 높이는 역할을 하는 성분이다. 본 발명에서는 Al2O3의 첨가량을 10~20%로 제한함이 바람직하다. 그 첨가량이 10%미만이면 슬래그 응고온도가 낮아져 슬래그 박리성이 나빠지고 용접 비드표면에 미세한 포크마크가 생기는 등 비드외관이 좋지 않으며, 20%를 초과하면 용접금속내 슬래그 혼입을 일으켜 용접금속 결함을 발생시킬 뿐만 아니라 인성저하의 원인이 되기 때문이다.
Al 2 O 3 together with TiO 2 and MgO increases the solidification temperature and viscosity of the slag, thereby improving the peelability of the slag and increases the solidification temperature of the slag without changing the basicity. In the present invention, it is preferable to limit the amount of Al 2 O 3 added to 10 to 20%. If the added amount is less than 10%, the slag solidification temperature is lowered, resulting in poor slag peelability and fine fork marks on the surface of the weld bead. Not only that, but also cause the degradation of toughness.

MgO : 20~30%MgO: 20 ~ 30%

MgO는 슬래그가 연소되어 붙는 것을 방지하고 적정 슬래그 점도를 유지하기 위해 첨가되며, 아울러 용접속 중의 산소함량을 저감시키는데에도 유용한 성분으로서, 본 발명에서는 그 첨가량을 20~30%로 제한함이 바람직하다. 그 첨가량이 20%미만이면 용접비드 표면에 슬래그가 융착되어 슬래그 박리성이 저하되며, 아울러 용접금속 중의 산소함량이 증가하여 충격인성이 저하하게 된다. 또한, 그 첨가량이 30%를 초과하면 슬래그 용융온도가 너무 높아져 용접비드 폭이 좁아질 뿐만 아니라 비드표면에 슬래그 잔해가 끼는 문제가 있기 때문이다.
MgO is added to prevent the slag from burning out and to maintain the proper slag viscosity, and is also a useful component to reduce the oxygen content in the welding process. In the present invention, the addition amount is preferably limited to 20 to 30%. . If the added amount is less than 20%, the slag is fused to the surface of the weld bead, the slag peelability is lowered, and the oxygen content in the weld metal is increased, thereby reducing the impact toughness. In addition, if the addition amount exceeds 30%, the slag melting temperature is too high, the width of the weld bead narrows, and there is a problem that the slag debris is caught on the bead surface.

CaF2 : 10~30%, CaF 2 : 10-30%,

CaF2 는 슬래그의 염기도를 높여 용접금속 중의 산소량을 저감시키므로 용접금속의 인성을 향상시키는 효과를 가지며, 아크 안정성 및 슬래그 유동성을 조정하고 슬래그의 점도를 높여 비드 형상을 양호하게 하는 효과를 갖는 성분이다. 플럭스 중 상기 CaF2 함량이 10% 미만이면 그 효과가 충분하지 않으며, 30%를 초과하면 아크안정성이 저하되어 슬래그 혼입이 발생하기 쉬워지며 슬래그의 융점이 너무 상승해 슬래그 박리성이 저하된다.
CaF 2 has the effect of improving the toughness of the weld metal by increasing the basicity of slag to reduce the amount of oxygen in the weld metal, and adjusting the arc stability and slag flowability and increasing the viscosity of the slag to improve the bead shape. . If the CaF 2 content in the flux is less than 10%, the effect is not sufficient. If the CaF 2 content is more than 30%, the arc stability is lowered, and slag is easily mixed, and the melting point of the slag is increased so that slag peelability is lowered.

CaO : 10~20%, CaO: 10-20%,

CaO는 슬래그의 융점을 향상시켜 용융금속의 냉각속도를 조절함으로써, 용접금속의 인성을 향상시키는 효과를 나타낸다. 본 발명에서는 그 첨가량을 10~20%로 제한함이 바람직한데, 이는 10%미만에는 그 첨가에 따른 효과를 기대할 수 없는 반면에, 20%를 초과하면 슬래그 박리성이 나빠지기 때문이다.
CaO has the effect of improving the toughness of the weld metal by improving the melting point of the slag and controlling the cooling rate of the molten metal. In the present invention, the addition amount is preferably limited to 10 to 20%, since the effect of the addition cannot be expected at less than 10%, while the slag peelability deteriorates if it exceeds 20%.

TiO2+B2O3 : 3~5%TiO 2 + B 2 O 3 : 3 ~ 5%

TiO2는 슬래그 박리성과 아크 안정성을 향상시키고 양호한 비드외관을 얻기 위하여 첨가하는 성분이지만, 본 발명에서는 그 효과보다는 용접금속내에 Ti성분을 첨가하기 위해서 플럭스 내에 첨가된다. B2O3 역시 플럭스내에 B성분을 첨가 하기 위해서 플럭스 내에 첨가 된다. 본 발명에서 TiO2+B2O3 첨가량이 3~5% 제한함이 바람직한데 이는 3% 미만일 경우 용접금속내에 적절한 Ti, B함량을 유지할 수 없어 용접금속의 충격인성이 저하되며, 5%를 초과할 경우 용접금속내에 Ti, B함량의 초과로 균열 및 용접작업성 저하 문제가 발생할 수 있기 때문이다.
TiO 2 is a component added to improve slag peelability and arc stability and to obtain a good bead appearance. However, in the present invention, TiO 2 is added to the flux in order to add a Ti component into the weld metal rather than its effect. B 2 O 3 is also added to the flux to add component B into the flux. In the present invention, it is preferable that the TiO 2 + B 2 O 3 addition amount is limited to 3 to 5%. If the TiO 2 + B 2 O 3 amount is less than 3%, the appropriate toughness of Ti and B cannot be maintained in the weld metal, and thus the impact toughness of the weld metal is reduced, and 5% is reduced. This is because the excess of Ti and B content in the weld metal may cause problems of cracking and deterioration of weldability.

상기한 성분 외에, 플럭스를 적당한 크기의 입자로 만드는데 사용되는 점결제(binder)를 추가로 포함할 수 있으며, 기타 불가피한 불순물이 포함된다.In addition to the above components, it may further comprise binders used to make the flux into particles of a suitable size, and other unavoidable impurities are included.

상기 점결제로서는 Na2O, K2O 등을 이용하는 것이 바람직하다.
As the binder it is preferable to use, such as Na 2 O, K 2 O.

본 발명의 플럭스는 상기 조성에 있어서, ((TiO2+B2O3)/(SiO2+Al2O3+MgO+CaO))×100 의 값이 4.0~7.0을 만족한다. 상기 (TiO2+B2O3)는 주로 용접금속 충격인성 확보에 중요한 역할을 하는 성분이고, 산화물은 용접작업성에 영향을 미치는 성분으로, ((TiO2+B2O3)/(SiO2+Al2O3+MgO+CaO))×100 이 4.0~7.0 을 만족하는 경우에 용접금속의 충격인성과 용접작업성을 동시에 향상 시킬 수 있으나, 상기 값이 4.0~7.0을 벗어나는 경우 상기와 같은 효과를 기대할 수 없다.
In the flux of the present invention, the value of ((TiO 2 + B 2 O 3 ) / (SiO 2 + Al 2 O 3 + MgO + CaO)) × 100 satisfies 4.0 to 7.0 in the above composition. The (TiO 2 + B 2 O 3 ) is mainly a component that plays an important role in securing the impact toughness of the weld metal, the oxide is a component that affects the weldability, ((TiO 2 + B 2 O 3 ) / (SiO 2 When + Al 2 O 3 + MgO + CaO)) × 100 satisfies 4.0 to 7.0, the impact toughness and welding workability of the weld metal can be improved at the same time. Can't expect the effect.

한편, 본 발명 플럭스의 입도 분포는 입경이 0.2~1.0㎜의 입자가 80%이상인 것이 바람직하다. 만일 입경이 0.2㎜ 미만의 미세한 플럭스 입자가 과도하게 많을 경우 용접금속 가스결함이 발생하는 문제가 있으며, 반대로 1.0㎜이상의 조대한 입자가 과다하면 다층용접시 플럭스의 균일한 용융성을 확보할 수 없는 문제가 발생한다.
On the other hand, the particle size distribution of the flux of the present invention is preferably 80% or more of particles having a particle diameter of 0.2 to 1.0 mm. If there are too many fine flux particles having a particle diameter of less than 0.2 mm, there is a problem that a weld metal gas defect occurs. On the contrary, if the coarse particles of more than 1.0 mm are excessive, the uniform meltability of the flux cannot be secured during multilayer welding. A problem arises.

이하, 본 발명의 실시예에 대하여 상세히 설명한다. 하기 실시예는 본 발명의 이해를 위한 것일 뿐, 본 발명을 한정하는 것은 아니다.Hereinafter, embodiments of the present invention will be described in detail. The following examples are only for the understanding of the present invention, but not for limiting the present invention.

(실시예)(Example)

하기 표 1의 조성을 갖는 용접모재를 준비한 후, 하기 표 2의 조성을 갖는 와이어를 이용하여 표 3의 용접조건으로 맞대기 용접을 실시하였다. 이때 맞대기 용접에 이용된 플럭스의 조성은 하기 표 4와 같다.
After preparing a welding base material having a composition of Table 1, butt welding was performed under the welding conditions of Table 3 using a wire having a composition of Table 2. At this time, the composition of the flux used for butt welding is shown in Table 4 below.

상기와 같이, 맞대기 용접을 행한 후, 아크안정성 및 비드외관을 평가(용접사의 관능평가)하여 그 결과를 표 5와 같이, 우수(◎), 보통(○) 및 불량(×)으로 나타내었다. 또한, 용접 후 용접금속에 대하여 -60℃에서 샤르피 충격시험을 행하여 그 결과를 표 5에 나타내었으며, 이때 그 충격강도가 80J 이상인 경우는 우수(◎), 34~80J인 경우를 보통(○), 34J 미만을 불량(×)으로 평가하였다.
As described above, after the butt welding, arc stability and bead appearance were evaluated (the sensory evaluation of the welder), and the results are shown as good (◎), normal (○), and bad (×) as shown in Table 5. In addition, after the welding, the Charpy impact test was carried out at -60 ° C on the weld metal, and the results are shown in Table 5. In this case, when the impact strength is 80J or more, excellent (◎) and 34 ~ 80J are normal (○). , Less than 34 J was evaluated as defective (×).

모재종류
Base material type
두께(mm)
Thickness (mm)
조성(wt%)Composition (wt%) CC SiSi MnMn PP SS 나머지Remainder SS400SS400 2525 0.110.11 0.280.28 1.061.06 0.0150.015 0.0070.007 Fe 및 기타 불순물Fe and other impurities

와이어 직경
(mm)Wire diameter
(mm) 조성(wt%)Composition (wt%) CC SiSi MnMn PP SS 나머지Remainder 4.04.0 0.110.11 0.060.06 2.062.06 0.0060.006 0.0140.014 Fe 및 기타 불순물Fe and other impurities

전극electrode 전류(A)Current (A) 전압(V)Voltage (V) 용접속도(cpm)Welding speed (cpm) DC+DC + 550550 3030 4040

구분division SiO2 SiO 2 Al2O3 Al 2 O 3 MgOMgO CaF2 CaF 2 CaOCaO TiO2+B2O3 TiO 2 + B 2 O 3 기타Etc ((TiO2+B2O3)/(SiO2+Al2O3+MgO+CaO))×100((TiO 2 + B 2 O 3 ) / (SiO 2 + Al 2 O 3 + MgO + CaO)) × 100 발명예1Inventory 1 21.021.0 13.013.0 24.024.0 17.017.0 20.020.0 4.04.0 1.01.0 5.135.13 발명예2Inventive Example 2 19.019.0 13.013.0 25.025.0 22.022.0 15.015.0 4.54.5 1.51.5 6.256.25 발명예3Inventory 3 23.023.0 10.010.0 22.022.0 25.025.0 14.014.0 3.03.0 3.03.0 4.354.35 발명예4Honorable 4 25.025.0 19.019.0 28.028.0 12.012.0 11.011.0 3.53.5 1.51.5 4.224.22 발명예5Inventory 5 17.017.0 16.016.0 20.020.0 26.026.0 15.015.0 4.54.5 1.51.5 6.626.62 발명예6Inventory 6 16.016.0 18.018.0 27.027.0 16.016.0 17.017.0 5.05.0 1.01.0 6.416.41 발명예7Honorable 7 22.022.0 17.017.0 21.021.0 24.024.0 11.011.0 3.53.5 1.51.5 4.934.93 비교예1Comparative Example 1 13.013.0 20.020.0 28.028.0 16.016.0 18.018.0 3.03.0 2.02.0 3.803.80 비교예2Comparative Example 2 15.015.0 17.017.0 21.021.0 10.010.0 30.030.0 3.03.0 4.04.0 3.613.61 비교예3Comparative Example 3 24.024.0 20.020.0 30.030.0 10.010.0 12.012.0 3.03.0 1.01.0 3.493.49 비교예4Comparative Example 4 12.012.0 13.013.0 17.017.0 30.030.0 20.020.0 5.05.0 3.03.0 8.068.06 비교예5Comparative Example 5 17.017.0 13.013.0 22.022.0 27.027.0 13.013.0 5.05.0 3.03.0 7.697.69 비교예6Comparative Example 6 35.035.0 7.07.0 20.020.0 3.03.0 30.030.0 2.52.5 2.52.5 2.722.72 비교예7Comparative Example 7 24.024.0 2.02.0 20.020.0 14.014.0 32.032.0 6.06.0 2.02.0 7.697.69 비교예8Comparative Example 8 38.038.0 5.05.0 25.025.0 11.011.0 12.012.0 7.07.0 2.02.0 8.758.75 비교예9Comparative Example 9 15.015.0 18.018.0 25.025.0 20.020.0 17.017.0 1.51.5 3.53.5 2.002.00 비교예10Comparative Example 10 15.015.0 12.012.0 21.021.0 30.030.0 13.013.0 5.05.0 4.04.0 8.208.20 비교예11Comparative Example 11 24.024.0 14.014.0 27.027.0 15.015.0 12.012.0 6.06.0 2.02.0 7.797.79 비교예12Comparative Example 12 16.016.0 12.012.0 24.024.0 30.030.0 12.012.0 5.05.0 1.01.0 7.817.81

상기 표 4에서 기타는 플럭스를 적당한 크기의 입자로 만드는데 사용되는 점결제(binder)로부터 첨가되는 Na2O, K2O 등과 기타 불가피한 불순물의 양을 나타낸다.
Others in Table 4 above represent the amounts of Na 2 O, K 2 O, etc. and other unavoidable impurities added from the binder used to make the flux into particles of suitable size.

구분division 아크안정성Arc stability 비드외관Bead Appearance 저온충격인성Low temperature impact toughness 발명예1Inventory 1 ◎◎ ○○ ◎◎ 발명예2Inventive Example 2 ◎◎ ◎◎ ◎◎ 발명예3Inventory 3 ◎◎ ◎◎ ◎◎ 발명예4Honorable 4 ○○ ◎◎ ◎◎ 발명예5Inventory 5 ◎◎ ○○ ◎◎ 발명예6Inventory 6 ◎◎ ◎◎ ◎◎ 발명예7Honorable 7 ◎◎ ○○ ◎◎ 비교예1Comparative Example 1 ○○ ×× ○○ 비교예2Comparative Example 2 ○○ ×× ×× 비교예3Comparative Example 3 ○○ ○○ ×× 비교예4Comparative Example 4 ○○ ×× ○○ 비교예5Comparative Example 5 ○○ ×× ◎◎ 비교예6Comparative Example 6 ○○ ×× ×× 비교예7Comparative Example 7 ×× ×× ◎◎ 비교예8Comparative Example 8 ×× ×× ◎◎ 비교예9Comparative Example 9 ○○ ○○ ×× 비교예10Comparative Example 10 ×× ×× ◎◎ 비교예11Comparative Example 11 ○○ ×× ◎◎ 비교예12Comparative Example 12 ×× ×× ◎◎

상기 표 4 및 5에 나타난 바와 같이, 플럭스 조성뿐만 아니라, ((TiO2+B2O3)/(SiO2+Al2O3+MgO+CaO))×100의 값이 적정범위로 제어된 본 발명예 1 내지7은 다층용접시 모두 우수한 용접작업성과 저온충격인성을 얻을 수 있음을 알 수 있다. 이에 반하여, 본 발명 범위를 벗어난 비교예의 경우는 용접작업성이나 저온충격인성면에서 우수한 결과를 얻을 수 없음을 알 수 있다.
As shown in Tables 4 and 5, not only the flux composition, but also the value of ((TiO 2 + B 2 O 3 ) / (SiO 2 + Al 2 O 3 + MgO + CaO)) × 100 is controlled in an appropriate range. Inventive Examples 1 to 7 it can be seen that excellent welding workability and low temperature impact toughness can be obtained in all multi-layer welding. On the contrary, in the case of the comparative example outside the scope of the present invention, it can be seen that excellent results cannot be obtained in terms of weldability and low temperature impact toughness.

특히 비교예 3, 5, 10 및 12의 경우는 플럭스 조성 성분범위는 본 발명범위 이내이나, ((TiO2+B2O3)/(SiO2+Al2O3+MgO+CaO))×100 이 본 발명범위를 벗어난 것으로써 용접작업성이 열악하거나 용접금속 충격인성이 저하되어 본 발명예와는 확연히 구별됨을 알 수 있다.Especially in the case of Comparative Examples 3, 5, 10 and 12, the flux composition component range is within the scope of the present invention, but ((TiO 2 + B 2 O 3 ) / (SiO 2 + Al 2 O 3 + MgO + CaO)) × It can be seen that 100 is out of the scope of the present invention, the welding workability is poor or the weld metal impact toughness is lowered and is clearly distinguished from the examples of the present invention.

Claims (2)

중량%로, SiO2: 15~25%, Al2O3: 10~20%, MgO: 20~30%, CaF2: 10~30%, CaO: 10~20%, TiO2+B2O3: 3~5%, 나머지는 불가피한 불순물을 포함하고,
((TiO2+B2O3)/(SiO2+Al2O3+MgO+CaO))×100 의 값이 4.0~7.0을 만족하는 것을 특징으로 하는 서브머지드 아크용접용 플럭스.
By weight%, SiO 2 : 15-25%, Al 2 O 3 : 10-20%, MgO: 20-30%, CaF 2 : 10-30%, CaO: 10-20%, TiO 2 + B 2 O 3 : 3-5%, the rest contains inevitable impurities,
A submerged arc welding flux, wherein a value of ((TiO 2 + B 2 O 3 ) / (SiO 2 + Al 2 O 3 + MgO + CaO)) × 100 satisfies 4.0 to 7.0.
청구항 1에 있어서,
상기 플럭스는 입경이 0.2~1.0㎜인 입자가 80% 이상인 것을 특징으로 하는 서브머지드 아크용접용 플럭스.The method according to claim 1,
The flux is a submerged arc welding flux, characterized in that 80% or more of particles having a particle diameter of 0.2 ~ 1.0mm.
KR1020110142720A 2011-12-26 2011-12-26 Flux for submerged arc welding KR101286501B1 (en)

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JP2006272348A (en) * 2005-03-28 2006-10-12 Kobe Steel Ltd Bonded flux for submerged arc welding

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