KR101168162B1 - Submerged arc welding flux for thick steel plate welding - Google Patents

Submerged arc welding flux for thick steel plate welding Download PDF

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KR101168162B1
KR101168162B1 KR1020100135127A KR20100135127A KR101168162B1 KR 101168162 B1 KR101168162 B1 KR 101168162B1 KR 1020100135127 A KR1020100135127 A KR 1020100135127A KR 20100135127 A KR20100135127 A KR 20100135127A KR 101168162 B1 KR101168162 B1 KR 101168162B1
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welding
flux
submerged arc
slag
mgo
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KR1020100135127A
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KR20120073386A (en
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유동현
한동우
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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
    • B23K35/3607—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
    • 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

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

Abstract

본 발명은 고장력강 후판의 서브머지드 아크 용접시, 다층 용접뿐만 아니라, 단층(Two-run) 용접에 있어서도 우수한 용접작업성과 저온 충격인성을 확보할 수 있는 서브머지드 아크 용접 플럭스에 관한 것으로, 플럭스 전중량에 대한 중량%로, SiO2: 10~15%, Al2O3: 20~30%, TiO2: 10~15%, MgO: 25~35%, CaF2: 5~15%, CaO: 5~10%, MnO: 1~5% 및 나머지는 불가피한 불순물을 포함하고, MgO/(SiO2+TiO2)비가 1.0~1.5인 후판 용접용 서브머지드 아크 용접 플럭스를 제공한다.The present invention relates to a submerged arc welding flux which can secure excellent welding workability and low temperature impact toughness not only in multi-layer welding but also in two-run welding at the time of submerged arc welding of a high strength steel thick plate. % By weight, SiO 2 : 10-15%, Al 2 O 3 : 20-30%, TiO 2 : 10-15%, MgO: 25-35%, CaF 2 : 5-15%, CaO : 5-10%, MnO: 1-5% and the rest provide inevitable impurities and provide a submerged arc welding flux for thick plate welding with an MgO / (SiO 2 + TiO 2 ) ratio of 1.0-1.5.

Description

후판 용접용 서브머지드 아크 용접 플럭스{SUBMERGED ARC WELDING FLUX FOR THICK STEEL PLATE WELDING}Submerged Arc Welding Flux for Heavy Plate Welding {SUBMERGED ARC WELDING FLUX FOR THICK STEEL PLATE WELDING}

본 발명은 조선 및 해양구조물에 사용되는 고장력강 후판의 단층(Two-run) 및 다층 용접을 위한 서브머지드 아크 용접 플럭스에 관한 것이다.The present invention relates to submerged arc welding flux for two-run and multi-layer welding of high strength steel thick plates used in shipbuilding and offshore structures.

최근에 각종 구조물의 고강도화 및 후판화 추세에 따라 용접생산성을 향상시키기 위한 고능률의 용접기법의 채택이 증가하고 있다. 이러한 고능률 고입열의 용접시공은 용접생산성의 향상에는 크게 기여할 수 있으나, 건전한 용접부, 특히 우수한 충격인성을 확보하기는 어렵다.
Recently, with the trend of increasing the strength and thickening of various structures, the adoption of high efficiency welding techniques for improving welding productivity has been increasing. Such high efficiency high heat input welding construction can greatly contribute to the improvement of welding productivity, but it is difficult to secure sound welds, particularly excellent impact toughness.

특히 단층 용접은 그루브(Groove)형상이 I, Y, X 형태로 이루어진 모재를 양쪽면에서 한번(1층)씩만 용접하는 용접방법으로, 여러 층으로 용접을 진행하는 다층 용접에 비해 1층 용접시의 용접금속량이 많게 되고, 그에 따라 용접 입열량 또한 증가하지 않을 수 없다. 즉, 다층용접은 용접 입열량 범위가 40kJ/cm 이하로 적용되는 것이 일반적이며, 단층용접은 입열량 범위가 30~100kJ/cm정도로 적용되고 있는 실정이다. 이 때문에 단층용접은 입열량이 크고 모재와의 희석이 커짐으로써 충격인성 확보에 상당한 어려움이 따른다.
In particular, single-layer welding is a welding method in which the groove shape is welded only once (one layer) on both sides of a base material composed of I, Y, and X shapes. The amount of welded metal becomes large, and thus the heat input of the weld cannot be increased. That is, in the case of multi-layer welding, the welding heat input range is generally applied at 40 kJ / cm or less, and the single-layer welding is applied at a heat input range of about 30 to 100 kJ / cm. For this reason, single layer welding has a considerable difficulty in securing impact toughness due to a large amount of heat input and dilution with a base material.

일반적으로 50kgf/㎟급 고장력강 단층 용접용으로 사용되는 서브머지드 아크 용접용 플럭스는 모재 두께가 증가됨에 따라 용접 입열량이 증가하고 용접금속 조직이 조대해지기 때문에 충격인성 확보가 미흡한 점이 있다.
In general, the submerged arc welding flux used for 50kgf / mm2 high tensile steel single layer welding has insufficient strength in impact toughness because the heat input of the weld increases and the weld metal structure becomes coarse as the thickness of the base material increases.

이를 위해, 한국공개특허 제2002-0008869호 등에서는 플럭스 성분, 입도 및 CO2 함량을 제어함으로서, 기계적 성질, 용접작업성 및 저온균열특성을 해결하고자 하고 있으나, 이들은 다층 용접에 있어서는 그 목적을 확보할 수 있으나, 단층(Two-run) 용접에 있어서의 용접작업성 및 충격인성을 확보하는데 한계가 있었다.
To this end, Korean Patent Laid-Open Publication No. 2002-0008869 et al. Intends to solve mechanical properties, welding workability and low temperature cracking characteristics by controlling flux components, particle size and CO 2 content, but these have secured their purpose in multi-layer welding. However, there was a limit in securing welding workability and impact toughness in two-run welding.

상술한 용접시공상의 위험요인을 감소시키기 위해서는 용접부의 예열과 후열처리 등과 같은 용접시공 측면에서의 세심한 배려가 필수적이나, 대형구조물에는 예열이나 후열처리를 하는 것이 현실적으로 불가능하며, 이를 만족시킬 수 있는 용접재료나 용접기법의 개발 필요성이 대두되고 있다.In order to reduce the above-mentioned risk factors in welding construction, careful consideration is required in terms of welding construction such as preheating and post-heat treatment of welded parts, but it is practically impossible to preheat or post-heat treatment on large structures. There is a need for developing materials and welding techniques.

본 발명의 일측면은 고장력강 후판의 서브머지드 아크 용접시, 다층 용접뿐만 아니라, 단층(Two-run) 용접에 있어서도 우수한 용접작업성과 저온 충격인성을 확보할 수 있는 서브머지드 아크 용접 플럭스를 제공하고자 하는 것이다.One aspect of the present invention provides a submerged arc welding flux that can secure excellent welding workability and low temperature impact toughness not only in multi-layer welding but also in two-run welding at the time of submerged arc welding of a high strength steel thick plate. I would like to.

본 발명은 플럭스 전중량에 대한 중량%로, SiO2: 10~15%, Al2O3: 20~30%, TiO2: 10~15%, MgO: 25~35%, CaF2: 5~15%, CaO: 5~10%, MnO: 1~5% 및 나머지는 불가피한 불순물을 포함하고, MgO/(SiO2+TiO2)비가 1.0~1.5인 후판 용접용 서브머지드 아크 용접 플럭스를 제공한다.The present invention is a weight% of the total weight of the flux, SiO 2 : 10-15%, Al 2 O 3 : 20-30%, TiO 2 : 10-15%, MgO: 25-35%, CaF 2 : 5 ~ 15%, CaO: 5-10%, MnO: 1-5%, and the rest provide inevitable impurities, submerged arc welding flux for thick plate welding with MgO / (SiO 2 + TiO 2 ) ratio 1.0-1.5 do.

본 발명의 플럭스를 이용하면, 후판의 다층용접시는 물론 단층 용접시에도 슬래그 박리성과 비드외관 및 저온 충격강도가 우수한 용접금속을 얻을 수 있어, 조선, 압력용기, 해양 구조물 등의 제작을 위한 용접에 유용하게 적용될 수 있다.By using the flux of the present invention, it is possible to obtain a weld metal excellent in slag peelability, bead appearance, and low temperature impact strength not only during multi-layer welding of thick plates but also during single layer welding. It can be usefully applied to.

이하, 본 발명의 서브머지드 아크 용접 플럭스의 조성에 대하여 상세히 설명한다(이하 중량%).
Hereinafter, the composition of the submerged arc welding flux of the present invention will be described in detail (hereinafter by weight).

SiO2 : 10~15%SiO 2 : 10-15%

SiO2는 슬래그 점성 및 응고온도를 조절하기 위하여 첨가되며, 비드 외관 및 슬래그의 박리성을 양호하게 하기 위해 필수적으로 첨가되는 산성 산화물로서, 본 발명에서는 그 첨가량을 플럭스의 전중량에 대하여, 10~15%를 첨가하는 것이 바람직하다. 첨가량이 10% 미만이면 슬래그 유동성이 나빠져 비드 균질성 및 비드 퍼짐성이 저하되어 단층 용접시 아크가 튀는 현상과 비드 몰림 현상이 나타나며, 그 첨가량이 15%를 초과하면 슬래그 잔해가 발생하기 쉬우며 포크마크 등의 외관결함이 발생할 수 있고, 용접금속중의 산소량이 증가하여 충격강도를 저하시킬 수 있으므로, 10~15%를 포함하는 것이 바람직하다.
SiO 2 is added to control the slag viscosity and solidification temperature, and is an acid oxide which is essentially added to improve the appearance of the beads and the peelability of the slag. In the present invention, the addition amount is 10 to 10% based on the total weight of the flux. Preference is given to adding 15%. If the added amount is less than 10%, the slag fluidity deteriorates, so that the homogeneity of the slag and the spreading of the beads decrease, resulting in arc splashing and beading phenomenon during single layer welding, and when the added amount exceeds 15%, slag debris easily occurs and fork marks, etc. The appearance defect may occur, and the amount of oxygen in the weld metal may increase, thereby lowering the impact strength.

Al2O3 : 20~30%Al 2 O 3 : 20 ~ 30%

Al2O3는 슬래그의 염기도를 떨어뜨리지 않고 슬래그 점성, 응고온도를 조정하는데 유효한 성분이다. 상기 Al2O3의 첨가량이 20% 미만이면 첨가에 의한 효과를 기대하기 어렵고, 30%를 초과하게 되면 슬래그 점성이 증가하면서 유동성이 나빠져 볼록(convex) 비드가 형성되고, 비드 외관이 저하되기 때문에, 상기 Al2O3의 함량은 20~30%인 것이 바람직하다.
Al 2 O 3 is an effective component for adjusting slag viscosity and solidification temperature without lowering the basicity of slag. When the addition amount of Al 2 O 3 is less than 20%, it is difficult to expect the effect by the addition, if it exceeds 30%, the slag viscosity increases, the fluidity is worsened, convex beads are formed, and the appearance of beads is lowered. , The content of Al 2 O 3 is preferably 20 to 30%.

TiO2 : 10~15%TiO 2 : 10-15%

TiO2는 슬래그 박리성과 아크 발생을 안정화시키는 고융점 산화물로서 슬래그 응고속도를 제어하고 단층 용접시 비드를 평활하게 하기 위하여 첨가되는 산화물이다. 상기 TiO2의 함량이 10% 미만이면 충격인성을 제어하는 효과가 미비하며 용접비드 표면에 슬래그가 융착되어 슬래그 박리성이 열화되고, 15%를 초과하면 슬래그의 융점 상승으로 슬래그 점성이 열화되고, 포크마크 등의 발생으로 비드 외관을 해치기 때문에 10~15%로 하는 것이 바람직하다.
TiO 2 is a high melting point oxide that stabilizes slag peelability and arc generation, and is added to control slag solidification rate and to smooth beads in single layer welding. If the content of TiO 2 is less than 10%, the effect of controlling the impact toughness is inadequate, and slag is fused to the weld bead surface to deteriorate slag peelability, and if it exceeds 15%, the slag viscosity is deteriorated due to an increase in the melting point of slag. It is preferable to set it as 10 to 15% in order to damage the appearance of a bead by generating a fork mark.

MgO : 25~35%MgO: 25 ~ 35%

상기 MgO는 고융점 염기성 산화물로서 슬래그 응고속도를 조절하기 위해서 첨가된다. MgO의 첨가량이 25% 미만이면 염기도가 낮아져 용접금속내 산소함유량 제어가 어려워 충격인성이 저하되며, 35%를 초과하게 되면 슬래그의 융점이 너무 상승하여 용접비드가 중앙으로 몰리며 슬래그 잔해성 및 박리성이 나빠져 비드 외관을 해치기 때문에 25~35%를 포함하는 것이 바람직하다.
MgO is added as a high melting point basic oxide to control slag solidification rate. If the amount of MgO added is less than 25%, the basicity is low, which makes it difficult to control the oxygen content in the weld metal, and the impact toughness is lowered. When it exceeds 35%, the melting point of the slag is increased too much, and the weld bead is concentrated to the center. Since it worsens and damages a bead external appearance, it is preferable to contain 25 to 35%.

CaF2 : 5~15%CaF 2 : 5-15%

CaF2는 아크 안정성 및 슬래그 유동성을 조절하기 위해 첨가되며, 슬래그의 점성을 높혀 비드 형상을 양호하게 하는 역할을 하는 염기성 산화물이다. 또한, 용접금속 중의 산소량 및 질소량을 제어하여 충격인성을 향상시키는 유효한 성분이다. 상기 CaF2의 함량이 5% 미만에서는 산소 및 질소를 제어하는 효과를 기대하기 어렵고, 슬래그 응고온도를 증가시켜 비드외관을 나빠지게 하고, 15%를 초과하는 경우에는 아크 안정성을 저해하여 용접 비드가 불규칙해지고, 블로우 홀과 같은 결함 발생이 증가하므로, 그 함량은 5~15%인 것이 바람직하다.
CaF 2 is added to control the arc stability and slag flowability, and is a basic oxide that serves to increase the viscosity of the slag to improve the bead shape. Moreover, it is an effective component which improves impact toughness by controlling the amount of oxygen and nitrogen in a weld metal. When the CaF 2 content is less than 5%, it is difficult to expect the effect of controlling oxygen and nitrogen, and the slag solidification temperature is increased to worsen the appearance of the bead, and when it exceeds 15%, the welding bead is inhibited by inhibiting the arc stability. Since it becomes irregular and the occurrence of defects such as blow holes increases, the content thereof is preferably 5 to 15%.

CaO : 5~10%CaO: 5 ~ 10%

CaO는 염기성 산화물로서 용접금속의 충격강도를 향상시키는 효과를 가진 산화물이다. 그러나, 플럭스 중 그 함유량이 과소하면 첨가에 따른 효과를 기대할 수 없고, 과다한 경우에는 슬래그 박리성이 현저히 나빠지는 문제가 있다. 즉, CaO의 함량이 5% 미만이면 염기도가 부족하여 용접금속 중의 산소량이 증가하게 되고, 슬래그 점성이 부족하여 고전류 용접시 비드 험핑(humpping)이 발생하기 쉬우며, 10%를 초과하게 되면 슬래그 박리성이 저하되고 플럭스의 내흡습성이 나빠질 뿐만 아니라, 포크 마크가 발생하기 쉽기 때문에 그 함량은 5~10%인 것이 바람직하다.
CaO is an oxide having basic effect of improving the impact strength of a weld metal. However, when the content of the flux is too small, the effect of addition cannot be expected, and when excessive, the slag peelability is remarkably deteriorated. In other words, if the content of CaO is less than 5%, the basicity is insufficient to increase the amount of oxygen in the weld metal, and the slag viscosity is insufficient to easily cause bead humping in high current welding. It is preferable that the content is 5 to 10% because the property is lowered and the hygroscopicity of the flux is not only worsened, but also a fork mark is easily generated.

MnO : 1~5%MnO: 1-5%

MnO는 용접금속의 Mn을 확보하기 위한 염기성 성분으로 슬래그 점성 조절에 유효하다. 상기 MnO의 함량이 1% 미만시에는 단층(two-run) 용접시에 언더컷 및 슬래그 잔해 발생이 일어나기 쉽고, 5%를 초과하면 슬래그 박리성이 현저히 나빠지고, Mn 증가로 인해 충격인성이 감소할 뿐만 아니라, 가스의 발생이 증가되어 포크마크 등의 표면결함이 발생하기 때문에 1~5%로 한정하는 것이 바람직하다.
MnO is a basic component for securing Mn of the weld metal and is effective for controlling slag viscosity. When the MnO content is less than 1%, undercut and slag debris easily occurs during two-run welding, and when the MnO content exceeds 5%, the slag peelability is significantly worsened and impact toughness decreases due to Mn increase. In addition, since the generation of gas is increased to cause surface defects such as fork marks, it is preferable to limit the amount to 1 to 5%.

상기 조성에 나머지는 불가피한 불순물을 포함한다.
The remainder of the composition contains inevitable impurities.

본 발명 플럭스는 상기 조성 중 MgO/(SiO2+TiO2)의 조성비가 1.0~1.5인 것이 바람직하다. 상기 MgO, SiO2, TiO2는 슬래그 점성과 응고온도를 조절하는 역할을 하는 성분들로서, 본 발명자들은 MgO/(SiO2+TiO2)의 조성비가 고전류 다층 용접과 단층(two-run) 용접에 영향을 미치는 것을 인지하고 본 발명에 이르게 되었다. 상기 조성비가 1.0 미만이면 용접작업성은 비교적 양호하나, 용접금속의 산소량이 증가하여 충격인성을 확보하기 어려우며, 1.5를 초과하면 용접작업성, 특히 단층(two-run) 용접에 있어서 슬래그 잔해성 및 비드 형상이 열악해지기 때문에, 1.0~1.5인 것이 바람직하다.
The flux of the present invention preferably has a composition ratio of MgO / (SiO 2 + TiO 2 ) in the range of 1.0 to 1.5. The MgO, SiO 2 , TiO 2 is a component that controls the slag viscosity and solidification temperature, the present inventors have a composition ratio of MgO / (SiO 2 + TiO 2 ) to high current multilayer welding and two-run welding It was recognized that the influence and the present invention was reached. If the composition ratio is less than 1.0, the weldability is relatively good, but the oxygen content of the weld metal is increased, making it difficult to secure impact toughness. If the composition ratio exceeds 1.5, the slag debrisability and the bead in the weldability, in particular, two-run welding, are exceeded. Since the shape becomes poor, it is preferable that it is 1.0-1.5.

이하, 본 발명의 실시예에 대하여 상세히 설명한다. 하기 실시예는 본 발명의 이해를 위한 것일 뿐, 하기 실시예에 의해서 본 발명이 한정되는 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, and the present invention is not limited by the following examples.

(실시예)(Example)

하기 표 1의 조성을 갖는 플럭스를 마련하였다. 하기 표 1에서 각 성분의 단위는 중량%이다. 이 플럭스를 이용하여, 길이 500㎜, 두께 25㎜t의 AH36강 모재에 다층 용접을 실시하였다.The flux having the composition of Table 1 below was prepared. In Table 1 below, each component is in weight percent. Using this flux, multilayer welding was performed to the AH36 steel base material of length 500mm and thickness 25mmt.

상기 다층 용접의 극성은 AC, 용접조건 중 전류/전압/용접속도는 각각 750A/34V/40cpm으로 설정하여 용접을 진행하였다.
The welding was performed by setting the polarity of the multi-layer welding to AC and the current / voltage / connection degree of welding conditions to 750 A / 34 V / 40 cpm, respectively.

또한, 상기 플럭스를 이용하여, 길이 1000㎜, 두께 20㎜t의 EH36강 모재에 단층(two-run) 용접을 실시하였다. 상기 단층 용접에서 선행극 용접조건은 DC+, 1250A/35V로, 후행극 용접조건은 AC, 750A/40V로 하고, 용접속도는 100cpm으로 하여 용접을 진행하였다.
Moreover, using the said flux, two-run welding was performed to the EH36 steel base material of length 1000mm and thickness 20mmt. In the single-layer welding, the welding conditions were performed with the lead electrode welding conditions of DC + and 1250A / 35V, the trailing pole welding conditions of AC, 750A / 40V, and the welding speed of 100 cpm.

상기 다층 및 단층 용접에 사용된 와이어의 와이어경과 조성은 하기 표 2에 나타내었다.
Wire diameters and compositions of the wires used in the multilayer and single layer welding are shown in Table 2 below.

구분division SiO2 SiO 2 Al2O3 Al 2 O 3 TiO2 TiO 2 MgOMgO CaF2 CaF 2 CaOCaO MnOMnO MgO/(SiO2+TiO2)MgO / (SiO 2 + TiO 2 ) 발명예 1Inventory 1 1212 2323 1010 3232 1313 77 22 1.51.5 발명예 2Inventory 2 1414 2323 1313 3030 1010 66 22 1.11.1 발명예 3Inventory 3 1010 2424 1515 3535 77 55 33 1.41.4 발명예 4Honorable 4 1010 2727 1010 2626 1313 1010 22 1.31.3 비교예 1Comparative Example 1 1717 1919 1616 2424 99 1010 22 0.70.7 비교예 2Comparative Example 2 1212 1919 2020 3030 22 1212 33 0.90.9 비교예 3Comparative Example 3 1010 2626 77 3333 1414 77 22 1.91.9 비교예 4Comparative Example 4 88 2828 1414 2929 1212 44 33 1.31.3 비교예 5Comparative Example 5 1010 2323 1010 3232 1111 77 55 1.61.6 비교예 6Comparative Example 6 1212 2020 1010 3535 1414 55 22 1.61.6 비교예 7Comparative Example 7 1515 2020 1515 2525 1010 1010 22 0.80.8 비교예 8Comparative Example 8 1414 2626 1515 2626 22 1212 33 0.90.9

와이어경(㎜)Wire diameter (mm) CC SiSi MnMn PP SS CuCu 4.84.8 0.120.12 0.010.01 2.002.00 0.010.01 0.0050.005 0.060.06

상기 용접을 행한 후, 용접작업성 및 용접금속 충격강도를 평가하여 그 결과를 표 3에 나타내었다. 상기 용접작업성은 구체적으로 슬래그 박리성, 용접비드 균일성, 슬래그 잔해성, 포크마크 및 블로우홀 발생여부를 육안으로 확인하여, 우수(○), 보통(△), 불량(×) 으로 평가하였다.
After the welding, the weldability and the weld metal impact strength were evaluated and the results are shown in Table 3. Specifically, the welding workability was visually checked for slag peelability, weld bead uniformity, slag debris, fork mark, and blowhole generation, and evaluated as good (○), normal (△), and poor (×).

또한, 충격강도는 샤르피 충격인성 평가방법에 의하여 충격시험을 진행하고, 그 결과를 표 3에 나타내었다. 단층 및 다층 용접에 따라, 충격인성 온도를 달리하였고, 충격강도의 평가는 100J 이상은 우수(○), 100J 미만 50J 이상은 보통(△), 50J 미만은 불량(×)으로 평가하였다.
In addition, the impact strength was subjected to the impact test by the Charpy impact toughness evaluation method, the results are shown in Table 3. According to the single layer and multilayer welding, the impact toughness temperature was different, and the impact strength was evaluated as excellent (○) for 100J or more, normal (△) for less than 100J, and poor (×) for less than 50J.

구분division 다층용접Multi-layer Welding 양면 단층용접Double sided single layer welding 슬래그 박리성Slag peelability 용접비드 균일성Weld Bead Uniformity 슬래그 잔해성Slag debris 포크마크 및 블로우홀성Fork Marks and Blowholes 충격강도
(-60℃)Impact strength
(-60 ℃) 슬래그 박리성Slag peelability 용접비드 균일성Weld Bead Uniformity 슬래그 잔해성Slag debris 충격강도
(-20℃)Impact strength
(-20 ℃) 발명예 1Inventory 1 ○○ ○○ ○○ ○○ ○○ ○○ ○○ ○○ ○○ 발명예 2Inventory 2 ○○ ○○ ○○ ○○ ○○ ○○ ○○ ○○ ○○ 발명예 3Inventory 3 ○○ ○○ ○○ ○○ ○○ ○○ ○○ ○○ ○○ 발명예 4Honorable 4 ○○ ○○ ○○ ○○ ○○ ○○ ○○ ○○ ○○ 비교예 1Comparative Example 1 △△ △△ △△ ○○ ×× ○○ △△ △△ ×× 비교예 2Comparative Example 2 ○○ ×× △△ ×× △△ ×× ○○ △△ ×× 비교예 3Comparative Example 3 ×× △△ ×× ○○ △△ △△ △△ ×× △△ 비교예 4Comparative Example 4 ○○ △△ ○○ ○○ ○○ △△ ×× ○○ ○○ 비교예 5Comparative Example 5 △△ ○○ △△ △△ ○○ △△ ×× △△ △△ 비교예 6Comparative Example 6 ○○ ○○ ×× △△ ○○ ×× ×× △△ △△ 비교예 7Comparative Example 7 △△ △△ △△ ○○ ○○ △△ △△ △△ ×× 비교예 8Comparative Example 8 △△ ○○ △△ ○○ ○○ △△ △△ △△ ××

상기 표 3에 나타난 바와 같이, 본 발명의 조성 및 조성비를 만족하는 발명예 1 내지 4는 단층 및 다층 용접시 우수한 용접작업성과 충격강도를 갖는 것을 확인할 수 있었다.
As shown in Table 3, Inventive Examples 1 to 4 satisfying the composition and composition ratio of the present invention was confirmed to have excellent welding workability and impact strength during single and multi-layer welding.

이에 반해, 플럭스의 조성과 MgO/(SiO2+TiO2)의 조성비가 본 발명의 범위를 벗어나는 비교예 1 내지 3은 전반적으로 용접작업성과 충격강도가 저하되고, MgO/(SiO2+TiO2)의 조성비는 본 발명 범위이나, 일부 플럭스의 조성이 본 발명의 범위를 벗어나는 비교예 4에서는 충격인성이 양호하나, 우수한 용접작업성을 얻지는 못하였다. 그리고, 조성은 본 발명 범위이지만 MgO/(SiO2+TiO2)의 조성비가 본 발명 범위를 벗어난 비교예 5 내지 8은 양호한 용접작업성과 충격인성을 확보하기 어려웠다.On the contrary, Comparative Examples 1 to 3 in which the composition of the flux and the composition ratio of MgO / (SiO 2 + TiO 2 ) are outside the scope of the present invention generally reduce welding workability and impact strength, and MgO / (SiO 2 + TiO 2). The composition ratio of c) is in the range of the present invention, but the impact toughness is good in Comparative Example 4 in which the composition of some flux is out of the range of the present invention, but excellent welding workability was not obtained. In addition, although the composition is in the range of the present invention, Comparative Examples 5 to 8 in which the composition ratio of MgO / (SiO 2 + TiO 2 ) is out of the range of the present invention were difficult to secure good welding workability and impact toughness.

Claims (1)

플럭스 전중량에 대한 중량%로, SiO2: 10~15%, Al2O3: 20~30%, TiO2: 10~15%, MgO: 25~35%, CaF2: 5~15%, CaO: 5~10%, MnO: 1~5% 및 나머지는 불가피한 불순물을 포함하고, MgO/(SiO2+TiO2)비가 1.0~1.5인 후판 용접용 서브머지드 아크 용접 플럭스.% By weight of the total weight of the flux, SiO 2 : 10-15%, Al 2 O 3 : 20-30%, TiO 2 : 10-15%, MgO: 25-35%, CaF 2 : 5-15%, Submerged arc welding flux for heavy plate welding, wherein CaO: 5-10%, MnO: 1-5% and the remainder contain unavoidable impurities, and the MgO / (SiO 2 + TiO 2 ) ratio is 1.0-1.5.
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CN103934552A (en) * 2014-04-08 2014-07-23 武汉钢铁(集团)公司 Submerged-arc butt welding method for engineering structure steel with Rm larger than or equal to 650 MPa
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Citations (2)

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JPS6064792A (en) 1983-09-19 1985-04-13 Kawasaki Steel Corp Baked flux for high speed submerged arc welding
KR100671068B1 (en) 2005-09-29 2007-01-19 고려용접봉 주식회사 570mpa grade agglomerated flux with high impact-value for submerged arc welding

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JPS6064792A (en) 1983-09-19 1985-04-13 Kawasaki Steel Corp Baked flux for high speed submerged arc welding
KR100671068B1 (en) 2005-09-29 2007-01-19 고려용접봉 주식회사 570mpa grade agglomerated flux with high impact-value for submerged arc welding

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