KR20040049060A - Metal cored wire for high speed twin-tandem arc welding - Google Patents

Metal cored wire for high speed twin-tandem arc welding Download PDF

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KR20040049060A
KR20040049060A KR1020020076262A KR20020076262A KR20040049060A KR 20040049060 A KR20040049060 A KR 20040049060A KR 1020020076262 A KR1020020076262 A KR 1020020076262A KR 20020076262 A KR20020076262 A KR 20020076262A KR 20040049060 A KR20040049060 A KR 20040049060A
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welding
arc
cored wire
high speed
weight percent
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KR1020020076262A
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KR100817828B1 (en
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유철
김용덕
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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
    • B23K35/24—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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys

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

Abstract

PURPOSE: A metal cored wire for two-electrode high speed fillet arc welding is provided to improve workability and low-temperature impact-resistant characteristics by properly adding boride and deoxidizer to welding flux. CONSTITUTION: A metal cored wire used in a two-electrode high speed fillet arc welding process includes 0.01 to 0.10 weight percent of C, 1.0 to 4.5 weight percent of deoxidizer, 0.005 to 0.25 weight percent of arc stabilizer, 0.005 to 0.30 weight percent of F, less than 0.5 weight percent of oxygen, less than 0.025 weight percent of nitrogen, Fe and impurities. C stabilizes arc when performing the two-electrode high speed fillet arc welding process and reduces an amount of spatters while preventing oxides from penetrating into melted metal. The arc stabilizer includes Na, K, Li, Rb and Cs.

Description

2전극 고속필렛 아크용접용 메탈코어드 와이어{Metal cored wire for high speed twin-tandem arc welding}Metal cored wire for high speed twin-tandem arc welding

본 발명은 2개의 전극으로 하나의 용융지를 형성하면서 프라이머 도장강판의 고속필렛 용접에 이용되는 가스실드 아크용접용 메탈코어드 와이어에 관한 것으로서, 보다 상세하게는 와이어 조성을 최적화하고, 그 조성내에서 C함량, 플럭스중 산소 및 질소 함량에 대한 탈산제와 불화물 함량을 제어함으로써 용접작업성, 내기공성 및 저온인성이 향상된 2전극 고속필렛 가스실드 아크용접용 메탈코어드 와이어에 관한 것이다.The present invention relates to a metal shielded wire for gas shielded arc welding, which is used for high-speed fillet welding of primer-coated steel sheet while forming one melted paper with two electrodes. More specifically, the wire composition is optimized, and C The present invention relates to a metal-cored wire for arc welding of two-electrode high-speed fillet gas shielded arc, which improves weldability, porosity, and low temperature toughness by controlling the deoxidizer and fluoride content of the oxygen content and the oxygen and nitrogen content in the flux.

최근 조선, 교량, 철구조물 등을 제작함에 있어 점차 용접의 고속화 및 고효율화가 요구되고 있다. 이러한 요구에 부응하기 위하여, 2개의 전극으로 하나의 용융지를 형성하여 필렛(fillet)의 양면을 용접하는 트윈탠덤(twin-tandem) 용접기법이 널리 시행되고 있다. 그러나, 상기의 용접에 사용되는 강판에는 장기간 동안의 보관으로 인한 부식, 산화 등이 발생할 우려가 있어, 통상적으로 표면에 프라이머를 도포하고 있다. 상기 프라이머가 도포된 강판에 용접을 할 경우, 용접부에 프라이머 연소가스에 의한 피트(pit) 및 블로우홀(blow hole) 등이 발생하여 용접품질이 저하되고 추가적인 공수가 발생하는 문제점이 있다.Recently, in manufacturing shipbuilding, bridges, steel structures, etc., there is a demand for higher speed and higher efficiency of welding. In order to meet this demand, a twin-tandem welding technique in which one electrode is formed with two electrodes to weld both sides of a fillet has been widely implemented. However, the steel sheet used for the above welding may cause corrosion, oxidation, etc. due to long-term storage, and a primer is usually applied to the surface. When welding the steel plate coated with the primer, a pit and blow hole caused by the primer combustion gas are generated in the welded portion, such that welding quality is deteriorated and additional labor is generated.

상기와 같은 문제점을 해결하기 위한 종래기술로는 일본 공개특허공보 평6-218578호가 있다. 상기 종래기술은 아크 안정제에 대한 산화물의 구성비, 슬래그 형성제로서 TiO2의 첨가량 및 탈산제와 산화철의 첨가량을 소정치로 제어하여 내기공성 및 작업성을 향상시키기 위한 것이다. 또 다른 종래기술로는 대한민국 특허 공개번호 2001-061851호가 있다. 상기 종래기술은 금속철, 슬래그 형성제, 불화물의 함량과 비를 적절히 조절하여 와이어의 내기공성과 슬래그 박리성을 향상시키기 위한 것이다.The prior art for solving the above problems is Japanese Patent Laid-Open No. 6-218578. The prior art is to improve the porosity and workability by controlling the composition ratio of the oxide to the arc stabilizer, the addition amount of TiO 2 as the slag forming agent and the addition amount of the deoxidizer and iron oxide to a predetermined value. Another prior art is Korean Patent Publication No. 2001-061851. The prior art is to improve the porosity and slag peelability of the wire by appropriately adjusting the content and ratio of metal iron, slag forming agent, fluoride.

그러나, 상기 종래기술들은 근본적으로 TiO2를 주성분으로 하여 용착금속 표면에 슬래그를 형성하는 티타니아계 플럭스 충전와이어로서, 용접금속 표면 전체에 슬래그가 포피되므로써 연소가스가 내부에 잔류하여 내기공성이 열화될 가능성이 있으며 용접속도를 향상시키는데 한계가 있는 문제점이 있다.However, the related arts are essentially titania-based flux filling wires which mainly form TiO 2 to form slag on the surface of the deposited metal. As the slag is encapsulated on the entire surface of the weld metal, combustion gas remains inside and the porosity is degraded. There is a possibility that there is a limit to improve the welding speed.

상기한 종래기술들의 문제점을 해결하기 위한 또 다른 종래기술로는 본 발명자가 출원한 대한민국 특허 출원번호 2001-84761호가 있다. 상기한 종래기술은 불화물 및 C의 함량을 적절히 제어하여 내기공성을 향상시키는 것에 관한 것이다. 그러나,상기 종래기술은 선경 1.6mm 정도의 용접 와이어를 사용하여 용접속도 1500mm/min로 용접하는 데에는 적합하나, 선경 2.0mm 이상의 태경 와이어를 적용하여 2000mm/min 이상의 속도로 고속 용접할 경우 내기공성 및 극저온(-30℃ 이하) 충격인성 등이 열화되는 문제점이 있다.Another prior art for solving the problems of the prior art is the Republic of Korea Patent Application No. 2001-84761 filed by the inventor. The prior art described above improves porosity resistance by appropriately controlling the content of fluoride and C. It's about things. However, the prior art is suitable for welding at a welding speed of 1500mm / min using a welding wire of about 1.6mm wire diameter, but applying high-speed welding at a speed of 2000mm / min or more by applying wire diameter of 2.0mm or more in wire diameter and porosity resistance. There is a problem that the cryogenic (-30 degrees C or less) impact toughness deteriorates.

본 발명은 상기한 종래기술들의 문제점을 해결하기 위한 것으로, 와이어 조성을 최적화하고, 그 조성내에서 C함량, 플럭스 중 산소 및 질소 함량에 대한 탈산제와 불화물 함량의 적절한 제어를 통하여 우수한 내기공성과 양호한 작업성 그리고 우수한 저온 충격인성을 갖는 2전극 고속필렛 아크용접용 메탈코어드 와이어를 제공하는데, 그 목적이 있다.The present invention is to solve the above problems of the prior art, and to optimize the wire composition, good porosity and good work through the appropriate control of the deoxidizer and fluoride content on the C content, the oxygen and nitrogen content in the flux To provide a metal-cored wire for two-electrode high-speed fillet arc welding having excellent properties and excellent low-temperature impact toughness, an object thereof.

상기한 목적을 달성하기 위한 본 발명은 와이어에 대한 중량%로, C: 0.01~0.10%, 탈산제: 1.0~4.5%, 아크안정제: 0.005~0.25%, 불화물중 F환산량: 0.005~0.30%, 플럭스 중의 산소: 0.5% 이하, 플럭스 중의 질소: 0.025% 이하, 나머지 Fe 및 기타 불가피한 불순물로 조성되며, 상기 C, 탈산제, 불화물중 F환산량, 산소 및 질소의 함량이 다음 수학식 1,In order to achieve the above object, the present invention provides a weight% of the wire, C: 0.01 to 0.10%, deoxidizer: 1.0 to 4.5%, arc stabilizer: 0.005 to 0.25%, F conversion amount of fluoride: 0.005 to 0.30%, Oxygen in the flux: 0.5% or less, nitrogen in the flux: 0.025% or less, and is composed of the remaining Fe and other unavoidable impurities, and the content of C, deoxidizer, F in fluoride, oxygen and nitrogen is represented by the following Equation 1,

[수학식 1][Equation 1]

을 만족하는 것을 포함하여 이루어진다.Made to satisfy.

이하, 본 발명에 대하여 상세하게 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

본 발명은 비드 표면의 슬래그가 거의 발생되지 않는 메탈코어드 와이어로서, 기존의 티타니아계 플럭스 충전와이어가 가지는 내기공성이 부족한 문제점을 해결한 우수한 내기공성과 양호한 작업성 그리고 우수한 저온 충격인성을 갖는 2전극 고속필렛 아크용접용 메탈코어드 와이어에 관한 것이다.The present invention is a metal-cored wire hardly generated slag of the bead surface, 2 having excellent porosity and good workability and excellent low temperature impact toughness to solve the problem of lack of porosity of the existing titania-based flux filling wire The present invention relates to a metal cored wire for electrode fast fillet arc welding.

먼저, 본 발명의 성분제한 이유부터 살펴본다.First, look at the reasons for limiting the components of the present invention.

C: 0.01~0.10중량%C: 0.01 to 0.10 wt%

상기 C는 2전극 용접에 있어서 아크를 안정화 시키며 스패터 발생을 감소시킬 뿐만 아니라 아크력을 증대시켜서 산화개재물(MnO,Al2O3,SiO2등)의 용착금속내 침투를 억제시켜서 건전한 용접부를 얻을 수 있게 한다. 또한, 용접부의 인성과 강도를 유지하는데 유효한 성분이다.In the two-electrode welding, C not only stabilizes the arc and reduces spatter generation, but also increases the arc force, thereby suppressing the penetration of the oxide inclusions (MnO, Al 2 O 3 , SiO 2, etc.) into the weld metal, thereby ensuring a healthy weld. To get it. It is also an effective component for maintaining the toughness and strength of the welded portion.

상기 C의 함량이 0.01중량% 미만이면 아크력이 저하되어 결함의 발생이 용이하게 되고 용접금속의 강도와 인성이 저하되며, 0.10중량%를 초과하면 아크 안정성이 저하되고 스패터가 과도하게 발생되어 용접작업성을 열화시킨다. 또한, 과량의 C가수소와 결합하여 메탄가스(CH4)를 발생시켜 피트 및 블로우홀 등을 발생시키고 용접금속의 강도를 과도하게 증가시켜 저온 인성을 열화시키므로, 그 함량을 0.01~0.10중량%로 제한하는 것이 바람직하다.When the content of C is less than 0.01% by weight, the arc force is lowered to facilitate the generation of defects, and the strength and toughness of the weld metal are lowered. When the content of C is more than 0.10% by weight, the arc stability is lowered and the spatter is excessively generated. Deterioration of weldability. In addition, it combines with excess C hydrogen to generate methane gas (CH 4 ) to generate pits and blow holes, and excessively increase the strength of the weld metal to deteriorate low temperature toughness, so the content is 0.01 to 0.10% by weight It is preferable to limit to.

탈산제: 1.0~4.5중량%Deoxidizer: 1.0-4.5 wt%

상기 탈산제로는 Si,Mn,Mg,Ti,Al,Ca,Zr 등이 있으며, 용접금속 내부의 산소 및 질소의 함량을 저감하여 건전한 용접금속을 형성하고, 용탕의 점성을 증가시켜 용접중 발생하는 프라이머 연소가스에 의한 기공이 용접금속 저면에서 중앙부로 성장하는 것을 억제시키는데 유효한 성분이다. 상기 탈산제의 총합이 1.0중량% 미만이면 용접금속내 탈산이 부족하여 용접금속 내에 잔존하는 산소와 질소함량이 과도해져서 -30℃ 이하에서의 인성이 저하되며, 용탕의 점성 저하로 인해 프라이머 연소가스의 발생을 억제하지 못하여 표면에 피트, 블로우홀 등을 형성하고, 4.5중량%를 초과하면 아크의 불안정 및 스패터의 과다로 용접작업성이 열화되므로, 그 함량을 1.0~4.5중량%로 제한하는 것이 바람직하다.The deoxidizer may be Si, Mn, Mg, Ti, Al, Ca, Zr, etc., to reduce the content of oxygen and nitrogen in the weld metal to form a healthy weld metal, and to increase the viscosity of the molten metal generated during welding It is an effective component for suppressing the growth of pores by primer combustion gas from the bottom of the weld metal to the center part. If the total amount of the deoxidizer is less than 1.0% by weight, the deoxidation in the weld metal is insufficient, so that the oxygen and nitrogen content remaining in the weld metal is excessive, and the toughness at -30 ° C or lower is lowered. Due to the decrease in viscosity of the molten metal, the generation of primer flue gas cannot be suppressed, and pits, blowholes, etc. are formed on the surface. Is preferably limited to 1.0 to 4.5% by weight.

아크안정제: 0.005~0.25중량%Arc Stabilizer: 0.005 ~ 0.25% by weight

상기 아크안정제로는 Na,K,Li,Rb,Cs 등이 있으며, 스패터의 발생량을 저감시키고 스프레이 아크 이행성을 향상시키는데 유효한 성분이다. 상기 아크안정제의 총합이 0.005중량% 미만이면 아크 안정 효과를 얻을 수 없을 뿐만 아니라 스패터가 과다하게 발생하는 문제가 있으며, 0.25중량%를 초과하면 아크 증기압이 상승하여 아크불안을 초래하고 용접 흄(Fume)발생이 과다하며 비드 외관이 불균일해지므로, 그 함량을 0.005~0.25중량%로 제한하는 것이 바람직하다.The arc stabilizer includes Na, K, Li, Rb, Cs, etc., and is an effective ingredient for reducing the amount of spatter generated and improving spray arc transferability. If the total amount of the arc stabilizer is less than 0.005% by weight, the arc stabilizing effect may not be obtained and spatter may be excessively generated. If the amount of the arc stabilizer exceeds 0.25% by weight, the arc vapor pressure may increase, causing arc anxiety and welding fume ( Since the occurrence of fume is excessive and the appearance of the beads becomes uneven, it is preferable to limit the content to 0.005 to 0.25% by weight.

불화물중 F환산량: 0.005~0.30중량%F equivalent in fluoride: 0.005 to 0.30 wt%

불화물은 용접금속 내부의 탈수소 작용 및 용접과정 중 용접금속의 응고를 지연시켜 용접금속 내부의 프라이머 연소 가스가 대기로 방출될 수 있는 시간을 충분히 확보한다. 상기 불화물을 적절하게 첨가하면 피트 및 블로우홀을 형성하는 프라이머 연소가스의 주된 성분인 수소를 현저하게 저감시킬 수 있을 뿐만 아니라 아크가 안정화되며 스패터의 발생도 저감된다. 상기 불화물은 NaF, Na3AlF6,K2SiF6, CaF2,LiF, MgF2,BaF2등의 형태로 첨가될 수 있다.The fluoride delays the dehydrogenation of the weld metal and the solidification of the weld metal during the welding process to ensure sufficient time for the primer combustion gas in the weld metal to be released into the atmosphere. Appropriate addition of the fluoride not only significantly reduces hydrogen, which is a major component of the primer combustion gas forming the pits and blowholes, but also stabilizes the arc and reduces the generation of spatters. The fluoride may be added in the form of NaF, Na 3 AlF 6, K 2 SiF 6 , CaF 2, LiF, MgF 2, BaF 2, and the like.

상기 불화물중 F환산량이 0.005중량% 미만이면 첨가에 따른 상기 효과를 얻을 수 없고, 0.30중량%를 초과하면 스패터 및 흄이 과다하게 발생되며 용융금속의 점성이 낮아져 비드외관을 해치므로, 그 함량을 0.005~0.30중량%로 제한하는 것이 바람직하다.If the amount of F in the fluoride is less than 0.005% by weight, the effect of the addition may not be obtained. When the amount of F is more than 0.30%, the spatter and the fume are excessively generated, and the viscosity of the molten metal is lowered, thereby damaging the bead appearance. Is preferably limited to 0.005 to 0.30% by weight.

산소: 0.5중량% 이하, 질소: 0.025중량% 이하Oxygen: 0.5 wt% or less, Nitrogen: 0.025 wt% or less

본 발명의 와이어에 있어서, 플럭스 내부에 존재하는 산소 및 질소의 함량이 각각 0.5중량% 및 0.025중량%를 초과하면 용접과정 중 용접금속 표면에 피트 및 블로우홀을 형성하며, 용접 후 용접금속 내부에 잔존하여 인성을 저하시킨다. 또한, 용탕의 점성을 저하하여 프라이머 연소가스에 의한 기공이 용접금속 저면에서 중앙부로 성장하는 문제를 초래하므로, 그 함량을 각각 산소 0.5중량% 이하, 질소 0.025중량% 이하로 제한하는 것이 바람직하다.In the wire of the present invention, if the oxygen and nitrogen content in the flux exceeds 0.5% by weight and 0.025% by weight, respectively, pits and blowholes are formed on the weld metal surface during the welding process, and after welding It remains and reduces toughness. In addition, since the viscosity of the molten metal decreases to cause pores due to the primer combustion gas to grow from the bottom of the weld metal to the center portion, the content of the molten metal is preferably limited to 0.5 wt% or less of oxygen and 0.025 wt% or less of nitrogen, respectively.

또한, 본 발명에서는 우수한 내기공성 및 양호한 작업성능 그리고 우수한 저온 충격인성 확보를 위하여 상기 C, 산소, 질소 함량에 대한 탈산제 및 불화물중 F환산량의 비를 하기 수학식 1과 같이 관리하는 것이 바람직하다.In addition, in the present invention, in order to secure excellent porosity resistance and good work performance and excellent low-temperature impact toughness, it is preferable to manage the ratio of the deoxidizing agent and the amount of F in the fluoride to the C, oxygen, and nitrogen content as shown in Equation 1 below. .

상술한 바와 같이, 본 발명에서 상기 C는 용접과정 중 수소와 결합하여 피트 및 블로우홀 생성의 주된 요인중의 하나인 메탄(CH4)가스를 형성하므로 불화물을 첨가하여 수소 함량을 제어한다. 또한, 상기 플럭스내 산소와 질소는 피트 및 블로우홀 생성의 주된 요인중의 하나인 동시에 용접 금속의 저온 인성을 저하시키므로 탈산제를 첨가하여 이를 제어한다.As described above, in the present invention, C combines with hydrogen during the welding process to form methane (CH 4 ) gas, which is one of the main factors of pit and blowhole generation, so that fluoride is added to control the hydrogen content. In addition, oxygen and nitrogen in the flux are one of the main factors for the formation of pits and blowholes, and at the same time, lowering the low temperature toughness of the weld metal, thereby controlling the addition of a deoxidizer.

상기 수학식 1의 비가 2.5를 초과하면 C 함량에 비하여 불화물중 F환산량이 부족하므로 탈수소 작용이 부족하여 CH4가스가 용이하게 형성되므로써 블로우홀을 형성하게 된다. 또한, 산소 및 질소함량에 비하여 탈산제가 부족하므로 탈산부족에 의한 가스성분의 용접금속 중 혼입으로 인하여 저온 인성이 저하될 뿐만 아니라, 용탕의 점성 부족으로 인한 프라이머 연소가스의 부상으로 표면 결함이 발생되므로, 상기 수학식 1의 비는 2.5 이하로 제한하는 것이 바람직하다.When the ratio of Equation 1 exceeds 2.5, the amount of F conversion in the fluoride is insufficient compared to the C content, and thus dehydrogenation is insufficient, so that the CH 4 gas is easily formed, thereby forming a blow hole. In addition, since deoxidizers are insufficient in comparison with oxygen and nitrogen contents, low-temperature toughness decreases due to incorporation of gas components into weld metals due to deoxidation, and surface defects occur due to the rise of primer combustion gases due to lack of viscosity. , The ratio of the above formula 1 is preferably limited to 2.5 or less.

또한, 본 발명은 상기한 조성에 Ni를 추가로 포함할 수 있다. 상기 Ni는 아크 안정성과 내기공성을 향상시키는 효과가 있고, -30℃ 이하의 저온인성을 안정화 시키는데 유효한 성분으로써 본 발명에서는 와이어에 대한 중량%로, 0.2~3.0%의 Ni을 첨가하는 것이 가장 바람직하다. 그 이유는 상기 Ni함량이 0.2중량% 미만이면 Ni첨가에 따른 효과가 적고, 3.0중량%를 초과하면 용접금속의 강도를 과도하게 증가시킬 뿐만 아니라 아크의 불안을 야기하여 비드외관이 나빠지기 때문이다.In addition, the present invention may further include Ni in the above composition. Ni has an effect of improving arc stability and porosity resistance, and is an effective ingredient for stabilizing low temperature toughness below -30 ° C. In the present invention, it is most preferable to add 0.2% to 3.0% of Ni as the weight of the wire. Do. The reason is that if the Ni content is less than 0.2% by weight, the effect of adding Ni is less, and if the content of Ni exceeds 3.0% by weight, the weld metal not only excessively increases the strength, but also causes anxiety of the arc, resulting in poor bead appearance.

또한, 본 발명의 메탈코어드 와이어는 CO2가스 혹은, CO2,Ar, He, O2등을 혼합한 혼합가스 모두를 보호가스로 사용할 수 있다.In addition, in the metal cored wire of the present invention , all of a mixed gas containing CO 2 gas or CO 2, Ar, He, O 2, or the like may be used as the protective gas.

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

[실시예]EXAMPLE

하기 표 1과 같이, 조성을 달리하여 선경 2.0mm의 메탈코어드 와이어를 각각 제조하였다. 이때 와이어를 구성하는 연강제 외피는 외피 전 중량에 대한 중량%로 C:0.026%, Si: 0.015%, Mn: 0.18%, P: 0.010%, S: 0.015%, 나머지는 Fe 및 불순물로 이루어진 것을 사용하였다.As shown in Table 1 below, the metal cored wire having a wire diameter of 2.0 mm was manufactured by varying the composition. At this time, the mild steel shell constituting the wire is C% 0.026%, Si: 0.015%, Mn: 0.18%, P: 0.010%, S: 0.015%, and the rest is made of Fe and impurities Used.

단, 상기 표 1에서 식①=However, in Table 1, the equation ① =

이다. to be.

상기와 같이 마련된 용접용 와이어들을 하기 표 2와 같은 용접조건 하에서 트윈탠덤(twin tandem) 1풀(pool)법으로 프라이머(primer) 도포두께가 40~50㎛인 15mm×150mm×2000mm의 T-Fillet 무기아연 프라이머 도포강판의 용접에 사용하였다. 상기 용접후 작업성, 내기공성 및 충격인성 등을 평가하여 하기 표 3에 나타내었다.T-Fillet of 15mm × 150mm × 2000mm with primer coating thickness of 40-50 μm by twin tandem 1 pool method under the welding conditions as shown in Table 2 below. It was used for welding the inorganic zinc primer coated steel sheet. After welding, workability, porosity resistance and impact toughness were evaluated and shown in Table 3 below.

상기 작업성의 평가는 용접작업자의 관능평가를 통해 이루어졌으며, 내기공성은 용접길이 2m당 용접부 이면측 파단면 내부의 블로우홀(blow hole) 발생 정도 및 비드표면의 피트(pit) 발생 정도로 부터 평가하였다.The workability was evaluated through the sensory evaluation of the welding worker, and the porosity was evaluated from the degree of blow hole in the fracture surface of the back side of the welded portion and the degree of pit generation on the bead surface per 2m of welding length. .

또한, 상기 충격인성의 평가는 미국용접협회(American Welding Society) AWS A 5.18의 규격에 준하여 행해졌으며, -30℃에서의 충격흡수 에너지가 80Joule이상이면 우수, 47~80Joule은 양호, 27~46J은 보통, 27Joule 미만은 불량으로 평가하여 표 3에 나타내었다.In addition, the evaluation of the impact toughness was carried out in accordance with the standard of American Welding Society AWS A 5.18, excellent when the shock absorption energy at -30 ℃ is 80Joule or more, 47 ~ 80Joule is good, 27 ~ 46J is In general, less than 27 Joule is shown in Table 3 to evaluate as bad.

선행극과 후행극(전류/전압)Leading and trailing poles (current / voltage) 용접속도Welding speed 용접각장Welding 보호가스Protective gas 500A/42V, 450A/38V500 A / 42 V, 450 A / 38 V 2000mm/min2000mm / min 5mm5 mm Ar+20%CO2, 20ℓ/minAr + 20% CO 2 , 20ℓ / min

구분division 작업성Workability 내기공성Air resistance 충격인성Impact toughness 종합평가Comprehensive Evaluation 발명재1Invention 1 ◎◎ ○○ △△ ○○ 발명재2Invention 2 ○○ △△ ○○ ○○ 발명재3Invention 3 ○○ ○○ ○○ ○○ 발명재4Invention 4 ○○ ○○ ○○ ○○ 발명재5Invention 5 △△ ◎◎ ◎◎ ◎◎ 발명재6Invention 6 ○○ ○○ ○○ ○○ 발명재7Invention 7 △△ ◎◎ ○○ ○○ 발명재8Invention Material 8 ○○ ◎◎ ◎◎ ◎◎ 발명재9Invention 9 ○○ ○○ ◎◎ ◎◎ 발명재10Invention 10 ○○ ○○ ○○ ○○ 비교재1Comparative Material 1 ○○ ×× ○○ ×× 비교재2Comparative Material 2 ×× ○○ ○○ △△ 비교재3Comparative Material 3 ○○ △△ ×× △△ 비교재4Comparative Material 4 ○○ △△ ×× △△ 비교재5Comparative Material 5 ○○ ×× ○○ △△ 비교재6Comparative Material 6 △△ ×× △△ ×× 비교재7Comparative Material7 ×× ○○ △△ ×× 비교재8Comparative Material 8 ×× △△ ○○ △△ 비교재9Comparative Material 9 △△ ×× ×× ×× 비교재10Comparative Material 10 ×× △△ △△ △△ 비교재11Comparative Material 11 ×× △△ △△ ×× 비교재12Comparative Material 12 ×× ×× ×× ×× ◎: 우수 ○: 양호 △: 보통 ×: 불량◎: Excellent ○: Good △: Normal ×: Poor

상기 표 3에 나타낸 바와 같이, 와이어의 성분함량이 적정하게 제어된 발명재(1∼10)은 비교재(1~12)에 비하여 작업성, 내기공성, 충격인성 측면에서 모두 우수한 결과를 나타내었다. 특히, Ni이 0.2~3.0중량% 범위로 첨가된 발명재(5, 8, 9)는 더욱 우수한 내기공성 및 충격인성을 나타내는 것을 알 수 있다.As shown in Table 3, the invention materials (1 to 10) in which the component content of the wire was properly controlled showed excellent results in terms of workability, porosity resistance, and impact toughness compared to the comparative materials (1 to 12). . In particular, it can be seen that the inventive materials (5, 8, 9) to which Ni is added in a range of 0.2 to 3.0% by weight exhibit more excellent porosity resistance and impact toughness.

이에 반하여 비교재(1∼12)는 본 발명의 와이어 성분 조성 범위를 벗어난 것으로서, 작업성, 내기공성, 충격인성 측면에서 본 발명이 목표로 하는 결과를 얻을 수 없었다. 특히, 비교재(6, 9, 11)은 와이어 조성성분의 함량은 본 발명의 범위내에 있지만, 상기 수학식 1을 만족하지 않는 것으로 본 발명이 목표로 하는 결과를 얻지 못했다.On the contrary, the comparative materials 1 to 12 were outside the range of the wire component composition of the present invention, and thus the targets of the present invention could not be obtained in terms of workability, porosity resistance, and impact toughness. In particular, the comparative materials (6, 9, 11) content of the wire composition is within the scope of the present invention, but did not satisfy the above equation 1 did not achieve the target of the present invention.

상술한 바와같이, 본 발명은 탈산제, 아크안정제, 불화물중 F환산량 뿐만 아니라 C, 산소 및 질소에 대한 탈산제 및 불화물중 F환산량의 비를 적절하게 제어함으로써 우수한 내기공성과 양호한 작업성 그리고 우수한 저온 충격인성을 갖는 2전극용 메탈코어드 와이어를 제공하는 효과가 있다.As described above, the present invention provides excellent porosity and good workability and excellent performance by appropriately controlling the ratio of deoxidizer, arc stabilizer, F conversion amount in C, oxygen and nitrogen as well as deoxidizer and F conversion amount in fluoride. There is an effect of providing a metal-cored wire for two electrodes having low temperature impact toughness.

Claims (2)

와이어에 대한 중량%로, C: 0.01~0.10%, 탈산제: 1.0~4.5%, 아크안정제: 0.005~0.25%, 불화물중 F환산량: 0.005~0.30%, 플럭스 중의 산소: 0.5% 이하, 플럭스 중의 질소: 0.025% 이하, 나머지 Fe 및 기타 불가피한 불순물로 조성되며, 상기 C, 탈산제, 불화물중 F환산량, 산소 및 질소의 함량이 다음 수학식 1,% By weight of wire, C: 0.01-0.10%, deoxidizer: 1.0-4.5%, arc stabilizer: 0.005-0.25%, F equivalent in fluoride: 0.005-0.30%, oxygen in flux: 0.5% or less, in flux Nitrogen: 0.025% or less, the remaining Fe and other inevitable impurities, and the C, deoxidizer, F conversion amount in the fluoride, the content of oxygen and nitrogen in the following equation 1, [수학식 1][Equation 1] 을 만족하는 것을 특징으로 하는 2전극 고속필렛 아크용접용 메탈코어드 와이어.High-speed fillet arc welding metal cored wire, characterized in that to satisfy the. 제1항에 있어서, 상기 조성에 Ni이 0.2~3.0중량% 추가로 포함되는 것을 특징으로 하는 2전극 고속필렛 아크용접용 메탈코어드 와이어.[Claim 2] The metal-cored wire for high speed fillet arc welding of claim 1, further comprising 0.2 to 3.0 wt% of Ni in the composition.
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