KR101568517B1 - Solid wire for gas-metal arc welding - Google Patents

Solid wire for gas-metal arc welding Download PDF

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Publication number
KR101568517B1
KR101568517B1 KR1020130163193A KR20130163193A KR101568517B1 KR 101568517 B1 KR101568517 B1 KR 101568517B1 KR 1020130163193 A KR1020130163193 A KR 1020130163193A KR 20130163193 A KR20130163193 A KR 20130163193A KR 101568517 B1 KR101568517 B1 KR 101568517B1
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South Korea
Prior art keywords
wire
welding
arc welding
metal arc
gas
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KR1020130163193A
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Korean (ko)
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KR20150074936A (en
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정홍철
이동렬
김극
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주식회사 포스코
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Priority to CN201380081880.3A priority Critical patent/CN105848820B/en
Priority to PCT/KR2013/012149 priority patent/WO2015099219A1/en
Priority to DE112013007707.8T priority patent/DE112013007707B4/en
Priority to US15/104,707 priority patent/US10266929B2/en
Priority to KR1020130163193A priority patent/KR101568517B1/en
Priority to JP2016542266A priority patent/JP6576348B2/en
Publication of KR20150074936A publication Critical patent/KR20150074936A/en
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Publication of KR101568517B1 publication Critical patent/KR101568517B1/en
Priority to JP2017225099A priority patent/JP6803825B2/en

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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
    • B23K35/3066—Fe as the principal constituent with Ni as next major 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01005—Boron [B]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01006—Carbon [C]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01007—Nitrogen [N]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01008—Oxygen [O]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01013—Aluminum [Al]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01014—Silicon [Si]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01015—Phosphorus [P]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01016—Sulfur [S]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01022—Titanium [Ti]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01024—Chromium [Cr]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01025—Manganese [Mn]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01029—Copper [Cu]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01042—Molybdenum [Mo]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)

Abstract

본 발명은 중장비, 건설기계, 건축, 교량, 라인파이프 등의 고강도 강재의 가스메탈 아크 용접(Gas-Metal Arc Weld, GMAW)시 사용되는 가스메탈 아크 용접용 솔리드 와이어에 관한 것이다.The present invention relates to a solid wire for gas metal arc welding used in gas-metal arc welding (GMAW) of high strength steels such as heavy equipment, construction equipment, construction, bridges and line pipes.

Description

가스메탈 아크 용접용 솔리드 와이어 {SOLID WIRE FOR GAS-METAL ARC WELDING}SOLID WIRE FOR GAS-METAL ARC WELDING FOR GAS METAL ARC WELDING

본 발명은 중장비, 건설기계, 건축, 교량, 라인파이프 등의 고강도 강재의 가스메탈 아크 용접(Gas-Metal Arc Weld, GMAW)시 사용되는 가스메탈 아크 용접용 솔리드 와이어에 관한 것이다.
The present invention relates to a solid wire for gas metal arc welding used in gas-metal arc welding (GMAW) of high strength steels such as heavy equipment, construction equipment, construction, bridges and line pipes.

최근, 초고층 빌딩의 건설 및 사회간접자본의 건설이 활발히 진행되고 있으며, 이를 위한 중장비 및 건설기계의 수요가 크게 증가하고 있는 실정이다.
In recent years, the construction of skyscrapers and the construction of infrastructure have been actively carried out, and the demand for heavy equipment and construction machinery is increasing.

한편, 중장비 및 건설기계 등에 적용되는 강재는 초고강도, 극후물화 및 충격인성이 높은 소재가 사용되고 있으며, 이러한 강재들은 건전하고 효율적인 용접을 필요로 하며, 특히 대형 용접구조물의 안정성 확보를 위해서는 용접부 충격인성 특성이 무엇보다 중요하다.
On the other hand, steel materials used for heavy equipment, construction machinery, etc. are used for materials with high ultrahigh strength, extreme post-mortification and high impact toughness. These steels require sound and efficient welding. Especially, in order to secure the stability of large- Characteristics are more important than anything else.

이와 같이, 용접부 충격인성의 확보를 위해서는 용접생산성의 향상이 우선되어야 하며, 이에 자동화 및 로보트 용접이 가능한 가스메탈 아크 용접이 주로 이용되고 있다.
As described above, in order to secure the impact toughness of the welded portion, improvement of welding productivity should be prioritized, and gas metal arc welding capable of automation and robot welding is mainly used.

상기와 같은 용접시 형성되는 용접이음부는 용접 와이어가 용융되면서 일부 강재가 희석되어 용융풀을 형성하다가 이후 응고하면서 조대한 주상정 조직으로 발달하게 되는데, 이러한 조직은 용접재료 및 용접시공시 입열량에 따라 변화하게 되며, 이러한 용접이음부는 조대한 오스테나이트 결정입계를 따라 조대한 입계 페라이트, 위드만스타텐 페라이트(Widmanstatten ferrite), 마르텐사이트 및 도상 마르텐사이트(M-A, Martensite Austenite constituent) 등이 형성되어 충격인성이 가장 열화되는 부위이다.
As described above, the welded portion of the welded joint is melted and some of the steel is diluted to form a molten pool, which then develops into a coarse columnar structure while solidifying the welded material. The welded joints are formed along coarse austenite grain boundaries by forming coarse grain boundary ferrite, Widmanstatten ferrite, martensite and martensite Austenite constituent, etc. And the impact toughness is the most deteriorated part.

따라서, 대형 용접구조물의 안정성을 확보하기 위해서는 용접 후 형성되는 용접이음부의 미세조직을 제어하여 용접이음부의 충격인성을 확보할 필요가 있다.Therefore, in order to secure the stability of the large welded structure, it is necessary to secure the impact toughness of the welded joint by controlling the microstructure of the welded joint formed after welding.

이에, 특허문헌 1에서는 용접재료의 성분을 규정함으로써 용접구조물의 안정성을 확보하고자 하였으나, 이는 직접적으로 용접이음부의 미세조직, 입경 등을 제어하는 것이 아니므로, 이러한 용접재료로부터는 용접이음부의 인성을 충분히 얻기가 어렵다.
Patent Document 1 attempts to secure the stability of the welded structure by specifying the components of the welded material. However, since this does not directly control the microstructure and grain size of the welded joint, It is difficult to obtain enough personality.

일본 특허공개공보 (평)11-170085Japanese Patent Application Laid-Open No. 11-170085

본 발명의 일 측면은, 고강도 강재를 가스메탈 아크 용접함에 있어서 충격인성이 우수한 용접이음부를 얻을 수 있는 가스메탈 아크 용접용 솔리드 와이어를 제공하고자 하는 것이다.
An aspect of the present invention is to provide a solid wire for gas metal arc welding in which a welded joint having excellent impact toughness can be obtained in gas metal arc welding of a high strength steel material.

본 발명의 일 측면은, 솔리드 와이어 전체 중량을 기준으로, 탄소(C): 0.03~0.1%, 실리콘(Si): 0.1~0.5%, 망간(Mn): 2.0~3.0%, 니켈(Ni): 2.0~3.5%, 크롬(Cr): 0.1~0.6%, 몰리브덴(Mo): 0.3~1.0%, 티타늄(Ti): 0.01~0.05%, 구리(Cu): 0.1~0.6%, 보론(B): 0.0005~0.003%, 알루미늄(Al): 0.001~0.01%, 질소(N): 0.005% 이하, 산소(O): 0.003% 이하, 인(P): 0.03% 이하, 황(S): 0.03% 이하, 잔부 Fe 및 불가피한 불순물을 포함하고, 5 ≤ (5C+Si+2Mn) ≤ 7, 12 ≤ (Mo+2Cr+5Cu+4Ni) ≤ 15를 만족하는 것인, 가스메탈 아크 용접용 솔리드 와이어를 제공한다.
An aspect of the present invention relates to a method for manufacturing a solid wire comprising the steps of: 0.03 to 0.1% of carbon (C), 0.1 to 0.5% of silicon (Si), 2.0 to 3.0% of manganese (Mn) (B): 2.0 to 3.5%, Cr: 0.1 to 0.6%, Mo: 0.3 to 1.0%, Ti: 0.01 to 0.05%, Cu: 0.003% or less of oxygen (O), 0.03% or less of phosphorus (P), or 0.03% or less of sulfur (S) (Mo + 2Cr + 5Cu + 4Ni)? 15, and the balance Fe and unavoidable impurities, and satisfies 5? (5C + Si + 2Mn)? 7 and 12? do.

본 발명에 따른 가스메탈 아크 용접용 솔리드 와이어를 이용하여 고강도 강재를 용접하는 경우, 강도 및 저온 충격인성이 우수한 용접이음부를 얻을 수 있는 효과가 있다.
When the high strength steel material is welded by using the solid metal wire for gas metal arc welding according to the present invention, it is possible to obtain a welded joint having excellent strength and low temperature impact toughness.

이하, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 본 발명의 가스메탈 용접용 솔리드 와이어에 대하여 구체적으로 설명하도록 한다.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a solid wire for welding a gas metal of the present invention will be described in detail so that those skilled in the art can easily carry out the invention.

본 발명자들은 연구와 실험을 통해 가스메탈 아크 용접시 사용할 수 있는 솔리드 와이어로서, 저온에서도 충격인성이 우수하고 고강도의 용접이음부의 확보가 가능한 용접 와이어를 제공할 수 있는 합금원소의 범위를 설정할 수 있다는 점으로부터 착안하여, 본 발명을 완성하기에 이르렀다.
The present inventors have set up a range of alloying elements capable of providing a welding wire which can be used for gas metal arc welding through research and experiment, and which can provide welded wire having excellent impact toughness at low temperature and securing high strength welded joints The present invention has been completed.

보다 구체적으로, 본 발명자들은 기존의 침상 페라이트 미세조직만으로는 용접이음부의 강도를 충분히 확보할 수 없음을 확인하였으며, 인장강도 900MPa급 이상의 고강도 용접이음부의 충격인성을 향상시키기 위해서는 기지 강도에 효과적인 원소들의 첨가와 더불어, 인성 향상에 효과적인 미세조직으로서 침상페라이트, 하부 베이나이트 및 마르텐사이트 조직을 적정비율로 포함하도록 하는 경우, 고강도 및 고인성의 용접이음부를 동시에 얻을 수 있다는 사실을 발견하였다.More specifically, the present inventors have found that conventional needle-shaped ferrite microstructures can not sufficiently secure the strength of welded joints. In order to improve impact toughness of high strength welded joints having a tensile strength of 900 MPa or more, It has been found that high strength and high strength welds can be obtained at the same time when the ferrite, the lower bainite and the martensite structure are appropriately contained as microstructures effective for improving the toughness.

특히, 가스메탈 아크 용접시 사용되는 솔리드 와이어의 성분을 아래와 같이 제어할 경우, 목적하는 바를 달성할 수 있음을 확인하고, 본 발명을 완성하기에 이르렀다.Particularly, it has been confirmed that the desired result can be achieved by controlling the components of the solid wire used in the gas metal arc welding as described below, and the present invention has been accomplished.

[1] 가스메탈 아크 용접용 솔리드 와이어에 Mo, Cr, Mn 원소를 적정함량으로 조합하여 첨가시키면 용접 후 용접이음부의 인장강도를 향상시킬 수 있음. [1] It is possible to improve the tensile strength of welded joint after welding by adding Mo, Cr, and Mn elements to the solid wire for gas metal arc welding in combination.

[2] 상기 와이어에 적정함량으로 Cu, Ni, Ti를 첨가시키면 용접이음부에서 침상 페라이트 및 하부 베이나이트 조직을 형성시켜 용접이음부의 인성을 향상시킬 수 있음.
[2] When Cu, Ni, and Ti are added to the wire in an appropriate amount, it is possible to improve the toughness of the weld joint by forming the needle-like ferrite and the lower bainite structure in the weld joint.

상기 [1] 및 [2]에 대하여 하기에 구체적으로 설명한다.
The above-mentioned [1] and [2] will be specifically described below.

[1] Mo, Cr, Mn 원소의 최적량 첨가[1] Optimum amount of addition of Mo, Cr, and Mn elements

본 발명자들은 가스메탈 아크 용접용 솔리드 와이어에 Mo, Cr, Mn 원소를 적절히 첨가시키면 GMAW 용접이음부 강도를 향상시킬 수 있을 뿐만 아니라 경화성을 향상시켜 고인성 용접이음부를 확보할 수 있다는 사실을 밝혀내었다. 그러나, Mo, Cr, Mn원소는 다량으로 첨가할수록 강도가 급격히 증가하기 때문에 너무 과다하게 첨가하는 것은 바람직하지 못하고, 특히 이러할 경우 용접이음부 내 저온균열을 유발시키므로 바람직하지 못하다. 따라서, 가능한 최소범위의 Cr, Mo, Mn을 첨가함으로써 GMAW 용접이음부 미세조직을 상술한 바와 같이 제어함으로써 인장강도를 효과적으로 개선할 수 있는 것이다.
The inventors of the present invention have found that when Mo, Cr, and Mn elements are properly added to solid metal wires for gas metal arc welding, not only the strength of the GMAW welding can be improved but also the hardenability is improved, I got it. However, it is not preferable to add too much Mo, Cr, and Mn elements because the strength of the Mo, Cr, and Mn elements increases sharply as the amount of Mo, Cr, and Mn increases. Particularly, in this case, welding causes low temperature cracks in the weld. Therefore, by adding Cr, Mo, and Mn to the minimum possible range, the tensile strength can be effectively improved by controlling the GMAW welded joint microstructure as described above.

[2] Cu, Ni, Ti원소 최적량 첨가 [2] Optimum amounts of Cu, Ni and Ti elements

본 발명자들은 가스메탈 아크 용접용 솔리드 와이어에 Cu 및 Ni을 조합하여 첨가시키고 적당량의 Ti을 첨가시키면 GMAW 용접 후 용접이음부에 형성되는 Ti 복합산화물로부터 침상 페라이트의 변태를 촉진한다는 사실을 밝혀내었다. 이로 인해, 고강도이면서 용접이음부 충격인성 특성을 효과적으로 개선할 수 있는 것이다.
The present inventors have found that the addition of Cu and Ni in combination with the solid wire for gas metal arc welding and the addition of an appropriate amount of Ti promote the transformation of the needle-like ferrite from the Ti composite oxide formed in the weld zone after GMAW welding. As a result, it is possible to effectively improve the toughness toughness characteristics of the welded joint at high strength.

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

본 발명의 일 측면에 따른 가스메탈 아크 용접용 솔리드 와이어는, 솔리드 와이어 전체 중량을 기준으로, 탄소(C): 0.03~0.1%, 실리콘(Si): 0.1~0.5%, 망간(Mn): 2.0~3.0%, 니켈(Ni): 2.0~3.5%, 크롬(Cr): 0.1~0.6%, 몰리브덴(Mo): 0.3~1.0%, 티타늄(Ti): 0.01~0.05%, 구리(Cu): 0.1~0.6%, 보론(B): 0.0005~0.003%, 알루미늄(Al): 0.001~0.01%, 질소(N): 0.005% 이하, 산소(O): 0.003% 이하, 인(P): 0.03% 이하, 황(S): 0.03% 이하, 잔부 Fe 및 불가피한 불순물을 포함하는 것이 바람직하다.
A solid wire for gas metal arc welding according to an aspect of the present invention is characterized by comprising 0.03 to 0.1% of carbon (C), 0.1 to 0.5% of silicon (Si), 2.0% of manganese (Mn) (Cu): 0.1 to 0.6%, Mo: 0.3 to 1.0%, titanium (Ti): 0.01 to 0.05%, copper (Cu): 0.1 (P): not more than 0.03%; phosphorus (B): 0.0005 to 0.003%; aluminum (Al): 0.001 to 0.01% , Sulfur (S): 0.03% or less, the balance Fe and unavoidable impurities.

이하, 본 발명의 가스메탈 아크 용접용 솔리드 와이어의 성분을 상기와 같이 한정한 이유에 대하여 상세히 설명한다.
Hereinafter, the reason why the components of the solid wire for gas metal arc welding of the present invention are limited as described above will be described in detail.

C: 0.03~0.1%C: 0.03 to 0.1%

탄소(C)는 용접 와이어의 강도를 확보하기 위하여 필수적인 원소로서, 이러한 효과를 충분히 얻기 위해서는 0.03% 이상으로 C를 포함할 필요가 있다. 그러나, 그 함량이 너무 과다하여 0.1%를 초과하게 되면 열처리시 탈탄이 진행되는 문제가 있으므로 바람직하지 못하다.
Carbon (C) is an indispensable element for securing the strength of the welding wire, and it is necessary to include C at 0.03% or more in order to obtain such an effect sufficiently. However, if the content thereof is too large and exceeds 0.1%, decarburization proceeds during the heat treatment, which is not preferable.

Si: 0.1~0.5%Si: 0.1 to 0.5%

실리콘(Si)은 탈산효과를 위해 첨가하는 원소로서, 그 함량이 0.1% 미만이면 용접 와이어의 탈산효과가 불충분하고, 용융금속유동성이 저하되는 문제가 있다. 반면, 0.5%를 초과하게 되면 와이어의 제작을 위한 신선시 나쁜 영향을 미치며, 용접금속 내 도상 마르텐사이트(M-A constituent)의 변태를 촉진시켜 저온 충격인성을 저하시키고 용접 저온균열감수성에 나쁜 영향을 미치므로 바람직하지 못하다.
Silicon (Si) is an element to be added for the deoxidizing effect. If the content is less than 0.1%, the deoxidation effect of the welding wire is insufficient and the flowability of the molten metal is deteriorated. On the other hand, if it exceeds 0.5%, it will adversely affect the freshness of the wire for the production of the wire. It promotes the transformation of the MA constituent in the weld metal to deteriorate the low temperature impact toughness and adversely affect the low temperature crack susceptibility Which is undesirable.

Mn: 2.0~3.0%Mn: 2.0 to 3.0%

망간(Mn)은 용접 와이어의 강도를 향상시키는데 필수적인 원소이다. 이를 충분히 얻기 위해서는 2.0% 이상으로 함유되는 것이 바람직하지만, 그 함량이 3.0%를 초과하게 되면 용접 와이어의 신선시 나쁜 영향을 미치므로 바람직하지 못하다.
Manganese (Mn) is an essential element for improving the strength of the welding wire. In order to obtain this sufficiently, it is preferable that the content is 2.0% or more. However, when the content exceeds 3.0%, it is not preferable because the welding wire has bad influence upon drawing.

Ni: 2.0~3.5%Ni: 2.0 to 3.5%

니켈(Ni)은 고용강화에 의해 기지의 강도와 인성을 향상시키므로, 본 발명에서 필수적인 원소이다. 이러한 효과를 얻기 위해서는 2.0% 이상으로 Ni이 함유되는 것이 바람직하지만, 그 함량이 3.5%를 초과하게 되면 용접시 용접고온균열의 발생 가능성이 있으므로 바람직하지 못하다.
Nickel (Ni) is an essential element in the present invention because it enhances the strength and toughness of the base by solid solution strengthening. In order to obtain such an effect, it is preferable that Ni is contained in an amount of 2.0% or more. However, if the content exceeds 3.5%, there is a possibility of welding high-temperature cracking during welding, which is not preferable.

Cr: 0.1~0.6%Cr: 0.1 to 0.6%

크롬(Cr)은 강도에 기여하는 원소로 잘 알려져 있으며, 그 함량이 0.1% 미만이면 상기 강도향상 효과를 기대하기 어렵다. 다만, 그 함량이 0.6%를 초과하게 되면 용접이음부의 물성에 나쁜 영향을 미치므로 바람직하지 못하다.
Cr (Cr) is well known as an element contributing to strength. When the content is less than 0.1%, it is difficult to expect the strength improvement effect. However, if the content exceeds 0.6%, the weld will adversely affect the physical properties of the weld, which is not desirable.

Mo: 0.3~1.0%Mo: 0.3 to 1.0%

몰리브덴(Mo)은 용접이음부 강도 향상에 기여하는 원소로서, 이를 얻기 위해서는 0.3% 이상으로 첨가하는 것이 바람직하다. 다만, 그 함량이 1.0%를 초과하게 되면 용접이음부 인성에 나쁜 영향을 미치므로 바람직하지 못하다.
Molybdenum (Mo) is an element contributing to enhancement of the strength of the welded joint, and it is preferable to add 0.3% or more to obtain the molybdenum (Mo). However, if the content exceeds 1.0%, welding is undesirable because it adversely affects the toughness of the negative part.

Ti: 0.01~0.05%Ti: 0.01 to 0.05%

티타늄(Ti)은 용접 와이어에 첨가되어 용접이음부에서 산소와 결합하여 미세한 Ti 복합산화물을 형성시키므로, 본 발명에서 필수적인 원소이다. 이러한 미세한 Ti 복합산화물의 분산효과를 얻기 위해서는 용접 와이어 내 Ti 함량이 0.01% 이상인 것이 바람직하나, 그 함량이 0.05%를 초과하게 되면 오히려 조대한 Ti 복합산화물이 형성되어 용접이음부 물성에 나쁜 영향을 미치므로 바람직하지 못하다.
Titanium (Ti) is added to the welding wire to form a fine Ti composite oxide by bonding with oxygen at the weld joint, and thus is an indispensable element in the present invention. In order to obtain the dispersion effect of such a fine Ti composite oxide, the Ti content in the welding wire is preferably 0.01% or more. If the content exceeds 0.05%, however, a coarse Ti composite oxide is formed, It is not desirable because it is insane.

Cu: 0.1~0.6%Cu: 0.1 to 0.6%

구리(Cu)는 강도를 향상시키는데 효과적인 원소로서, 그 함량이 0.1% 미만이면 강도향상 효과가 미약하므로 바람직하지 못하다. 다만, 그 함량이 0.6%를 초과하게 되면 고강도 용접이음부의 균열을 조장하며, 충격인성에 나쁜 영향을 미치므로 바람직하지 못하다.
Copper (Cu) is an element effective for improving the strength. If the content is less than 0.1%, the effect of improving the strength is weak, which is not preferable. However, if the content exceeds 0.6%, a high strength weld promotes cracking of the welded portion and adversely affects impact toughness, which is not preferable.

B: 0.0005~0.003%B: 0.0005 to 0.003%

보론(B)은 소입성 향상에 유리한 원소로서, 입계에 편석되어 입계 페라이트의 변태를 억제하고, Ti 복합산화물에 BN 형태로 석출하여 입내에서 침상 페라이트의 변태를 촉진시킨다. 이러한 효과를 얻기 위해서는 0.0005% 이상으로 첨가하는 것이 바람직하나, 그 함량이 0.003%를 초과하게 되면 그 효과가 포화되고 용접 경화성이 크게 증가하여 마르텐사이트 변태를 촉진시킴으로써 용접 저온균열 발생 및 인성을 저하시키는 문제가 있으므로 바람직하지 못하다.
Boron (B) is an element favorable for improvement in the ingotability and is segregated in grain boundaries to suppress the transformation of intergranular ferrite and precipitate in the form of BN in the Ti composite oxide to promote the transformation of the needle ferrite in the grain. In order to obtain such an effect, it is preferable to add at least 0.0005%. If the content exceeds 0.003%, the effect is saturated and welding hardenability is greatly increased, thereby promoting martensitic transformation, thereby lowering the occurrence of low- There is a problem and it is not desirable.

Al: 0.001~0.01%Al: 0.001 to 0.01%

알루미늄(Al)은 탈산제로서 용접 와이어의 산소량을 감소시키므로 본 발명에서 필수적인 원소이다. 또한, 고용 질소와 결합하여 미세한 AlN 석출물을 형성시킨다. 이러한 효과를 얻기 위해서는 0.001% 이상으로 Al을 첨가하는 것이 바람직하지만, 그 함량이 0.01%를 초과하게 되면 조대한 Al2O3를 형성시켜 물성 확보에 불리한 영향을 미치므로 바람직하지 못하다.
Aluminum (Al) is an essential element in the present invention because it reduces the amount of oxygen in the welding wire as a deoxidizer. Further, it forms a fine AlN precipitate by bonding with the solid solution nitrogen. In order to obtain such an effect, it is preferable to add Al in an amount of 0.001% or more. However, when the content exceeds 0.01%, coarse Al 2 O 3 is formed, which adversely affects the securing of physical properties.

N: 0.005% 이하N: 0.005% or less

질소(N)는 용접 와이어에 불가피하게 첨가되는 원소로서, 그 상한을 0.005%로 관리하는 것이 바람직하다. 만일, N의 함량이 0.005%를 초과하게 되면 조대한 질화물이 석출되어 용접 와이어의 신선이나, 물성 확보에 불리한 영향을 미치므로 바람직하지 못하다.
Nitrogen (N) is an element inevitably added to the welding wire, and it is preferable to control the upper limit to 0.005%. If the content of N exceeds 0.005%, a coarse nitride is precipitated, which adversely affects the drawing of the welding wire and securing the physical properties, which is not preferable.

O: 0.003% 이하O: 0.003% or less

산소(O)는 용접 와이어에 불순물로 첨가되는 원소로, 만일 그 함량이 0.003%를 초과하게 되면 다른 원소와 반응하여 조대한 산화물을 형성시켜, 용접 와이어의 신선이나 물성 확보에 불리한 영향을 미치므로 바람직하지 못하다.
Oxygen (O) is an element that is added to the welding wire as an impurity. If the content exceeds 0.003%, it reacts with other elements to form a coarse oxide, which adversely affects the drawing of the welding wire and securing properties It is not desirable.

P: 0.03% 이하P: not more than 0.03%

인(P)은 용접 와이어에 불순물로 첨가되는 원소로서, 용접 와이어의 열처리시 균열 등에 영향을 미치므로 그 함량을 0.03% 이하로 관리하는 것이 바람직하다.
Phosphorus (P) is an element added to the welding wire as an impurity, and it affects cracks during heat treatment of the welding wire. Therefore, it is preferable to control the content to 0.03% or less.

S: 0.03% 이하S: not more than 0.03%

황(S)은 용접 와이어에 불순물로 첨가되는 원소로, 조대한 MnS 및 고온균열을 유발시키므로 그 함량을 0.03% 이하로 관리하는 것이 바람직하다.
Sulfur (S) is an element which is added to the welding wire as an impurity. It causes coarse MnS and high temperature cracking, so it is preferable to control the content to 0.03% or less.

상술한 성분조성을 만족하는 본 발명의 가스메탈 아크 용접용 솔리드 와이어는 상기 첨가되는 원소들 중 C, Si 및 Mn의 관계(5C+Si+2Mn)가 5~7을 만족하는 것이 바람직하다.It is preferable that the solid wire for gas metal arc welding according to the present invention satisfying the above-mentioned composition satisfies the relationship (5C + Si + 2Mn) of C, Si and Mn among 5 to 7 among the added elements.

본 발명에서 C, Si 및 Mn의 관계(5C+Si+2Mn)가 5 미만이면 용접시 용융금속이 산소와 반응하여 산화되기 때문에 용접이음부에 잔존하는 합금 성분의 양이 낮아지므로 바람직하지 못하고, 7을 초과하게 되면 용접 경화성이 증가하여 용접 후 용접이음부 저온균열 및 충격인성에 나쁜 영향을 미치므로 바람직하지 못하다.
In the present invention, when the relationship (5C + Si + 2Mn) between C, Si and Mn is less than 5, the molten metal reacts with oxygen to oxidize during welding, so that the amount of the alloy component remaining in the welding portion is lowered, 7, the weld hardenability is increased, which is not preferable since the weld after welding adversely affects the low-temperature crack and impact toughness at the negative part.

또한, 본 발명의 솔리드 와이어는 Mo, Cr, Cu 및 Ni의 관계(Mo+2Cr+5Cu+4Ni)가 12~15를 만족하는 것이 바람직하다.It is also preferable that the solid wire of the present invention satisfies the relationship (Mo + 2Cr + 5Cu + 4Ni) between Mo, Cr, Cu and Ni of 12 to 15.

본 발명에서 Mo, Cr, Cu 및 Ni의 관계(Mo+2Cr+5Cu+4Ni)가 12 미만이면 용접 후 용접이음부의 충격인성에 나쁜 영향을 미치므로 바람직하지 못하고, 15를 초과하게 되면 용접 경화성이 과다하게 증가하여 용접 저온균열감수성이 증가하므로 바람직하지 못하다.
In the present invention, when the relationship (Mo + 2Cr + 5Cu + 4Ni) between Mo, Cr, Cu, and Ni is less than 12, welding after welding may adversely affect impact toughness. Which is undesirable because it increases susceptibility to cold cracking in welding.

상기와 같이 조성되는 솔리드 와이어를 이용하여 가스메탈 아크 용접시, 형성되는 용접이음부의 기계적 성질을 더욱 향상시키기 위해, 아래와 같이 Nb, V 및 W으로 구성되는 그룹에서 선택된 1종 또는 2종 이상을 더 포함할 수 있다.
In order to further improve the mechanical properties of the welded joint formed during the gas metal arc welding using the solid wire thus formed, one or more selected from the group consisting of Nb, V and W .

Nb: 0.001~0.1%Nb: 0.001 to 0.1%

니오븀(Nb)은 용접이음부에서 소입성을 향상시키기 위해 첨가하는 원소로서, 특히 Ar3 온도를 낮추고 냉각속도가 낮은 범위에서도 베이나이트의 생성범위를 넓히는 효과가 있어, 베이나이트 조직을 얻는데 유리하다. 이와 함께 강도 향상 효과를 기대하기 위해서는 0.001% 이상으로 Nb을 첨가하는 것이 바람직하지만, 그 함량이 0.1%를 초과하게 되면 용접시 용접이음부에서 도상 마르텐사이트 형성을 촉진하여 용접이음부의 인성에 나쁜 영향을 미치므로 바람직하지 못하다.
Niobium (Nb) is an element to be added to improve the incombustibility at the welded joint, and has an effect of widening the production range of bainite even in a range where the Ar3 temperature is lowered and the cooling rate is low, which is advantageous for obtaining a bainite structure. It is preferable to add Nb in an amount of 0.001% or more in order to expect the strength improvement effect. However, when the content exceeds 0.1%, the weld promotes the formation of martensite in the weld zone during welding, Which is undesirable.

V: 0.001~0.1%V: 0.001 to 0.1%

바나듐(V)은 용접이음부에서 VN 석출물을 형성시켜 페라이트 변태를 촉진하는 원소로서, 이러한 효과를 얻기 위해서는 0.001% 이상으로 첨가될 필요가 있으나, 그 함량이 0.1%를 초과하게 되면 용접이음부에 카바이드(carbide)와 같은 경화상을 형성시켜 용접이음부의 인성에 나쁜 영향을 미치므로 바람직하지 못하다.
Vanadium (V) is an element that promotes ferrite transformation by forming VN precipitates at welded joints. To achieve this effect, it is necessary to add 0.001% or more of vanadium (V). When the content exceeds 0.1% It is not preferable since a light image such as a carbide is formed to cause a bad influence on the toughness of the welded portion.

W: 0.01~0.5%W: 0.01 to 0.5%

텅스텐(W)은 용접이음부에서 고온강도를 향상시키고 석출강화에 효과적인 원소이다. 이러한 W의 함량이 0.01% 미만이면 강도향상 효과가 미약하고, 반면 그 함량이 0.5%를 초과하게 되면 용접이음부 인성에 나쁜 영향을 미치므로 바람직하지 못하다.
Tungsten (W) is an element that improves high-temperature strength at welded joints and is effective in strengthening precipitation. If the content of W is less than 0.01%, the effect of improving the strength is weak. On the other hand, if the content of W exceeds 0.5%, the weld will adversely affect the toughness.

또한, 본 발명의 솔리드 와이어는 구오스테나이트의 결정립 성장 억제를 위해 Ca 및 REM 중 1종 또는 2종을 더 포함할 수 있다.
In addition, the solid wire of the present invention may further include one or two of Ca and REM for suppressing crystal grain growth of old austenite.

Ca: 0.0005~0.005% 및/또는 REM: 0.005~0.05%Ca: 0.0005 to 0.005% and / or REM: 0.005 to 0.05%

칼슘(Ca)와 희토류 원소(REM)는 본 발명에서 선택적으로 첨가되는 원소로서, 용접시 아크를 안정시키고 용접이음부에서 산화물을 형성시킨다. 또한, 냉각과정에서 오스테나이트 결정립 성장을 억제하고, 입내 페라이트 변태를 촉진시켜 용접이음부의 인성을 향상시킨다.Calcium (Ca) and rare earth elements (REM) are elements added selectively in the present invention, which stabilize the arc during welding and form oxides in the weld zone. It also inhibits the growth of austenite grains during the cooling process and promotes ferrite transformation in the ingot, thereby improving the toughness of the welded joint.

상술한 효과를 얻기 위해서 Ca은 0.0005% 이상, REM은 0.005% 이상으로 포함하는 것이 바람직하지만, 그 함량이 각각 0.005%, 0.05%를 초과하게 되면 용접스패터가 너무 많이 발생하여 용접작업성에 나쁜 영향을 미치므로 바람직하지 못하다. 이때, REM으로는 Ce, La, Y 및 Hf 등의 1종 또는 2종 이상을 사용하여도 무방하고, 어느 것도 상기 효과를 얻을 수 있다.
In order to obtain the above-mentioned effect, Ca is preferably contained in an amount of 0.0005% or more and REM is contained in an amount of 0.005% or more. When the content exceeds 0.005% or 0.05%, respectively, welding spatter occurs too much, Which is undesirable. At this time, one or more of Ce, La, Y and Hf may be used as the REM, and any of the above effects can be obtained.

본 발명이 제안하는 가스메탈 아크 용접용 솔리드 와이어는 전술한 합금조성 외에 잔부 Fe와 기타 제조공정상 불가피하게 함유되는 불순물을 포함하여 이루어질 수 있다.
The solid wire for gas metal arc welding proposed by the present invention may comprise the balance Fe and other impurities inevitably contained in the manufacturing process in addition to the above alloy composition.

또한, 본 발명의 가스메탈 아크 용접용 솔리드 와이어는 900℃ 이상의 가열로에서 가열 후 신선하여 최종 직경 약 1.2mm의 와이어로 제조하여 사용할 수 있다.
In addition, the solid metal wire for gas metal arc welding of the present invention can be manufactured by using a wire having a final diameter of about 1.2 mm after being heated in a heating furnace of 900 ° C or higher.

상술한 성분조성 및 관계를 모두 만족하는 본 발명의 가스메탈 용접용 솔리드 와이어를 이용하여 용접을 행한 후 형성되는 용접이음부는, 그 미세조직이 면적분율로 20~30%의 침상 페라이트 및 70~80%의 하부 베이나이트로 이루어짐으로써 인장강도 900MPa 이상의 초고강도와 -20℃에서의 충격인성이 70J 이상으로 고인성을 확보할 수 있다.The welded joint formed by performing the welding using the solid metal welding solid wire of the present invention satisfying all of the above-described composition and the relationships is characterized in that the microstructure has an acicular ferrite of 20 to 30% 80% of lower bainite, so that high tensile strength of 900 MPa or more and impact toughness at -20 ° C of 70 J or more can ensure high toughness.

상기 용접이음부는 그 미세조직으로 침상 페라이트 및 하부 베이나이트 이외에 일정 분율의 마르텐사이트를 포함하여도 목표로 하는 물성에는 큰 영향을 미치지 아니하며, 이때 상기 마르텐사이트는 면적분율로 5% 이하, 보다 바람직하게는 3% 이하로 포함하는 경우 용접이음부 물성 열화에 영향을 미치지 않는다.
The welded joint does not significantly affect the target properties even if the welded portion contains a certain fraction of martensite in addition to the needle-like ferrite and the lower bainite in its microstructure, wherein the martensite has an area fraction of 5% or less , The welds do not affect the deterioration of the physical properties of the weld.

이하, 실시예를 통하여 본 발명을 보다 구체적으로 설명하고자 한다. 다만, 하기의 실시예는 본 발명을 예시하여 보다 상세하게 설명하기 위한 것일 뿐, 본 발명의 권리범위를 한정하기 위한 것이 아니라는 점에 유의할 필요가 있다. 본 발명의 권리범위는 특허청구범위에 기재된 사항과 이로부터 합리적으로 유추되는 사항에 의해 결정되는 것이기 때문이다.
Hereinafter, the present invention will be described more specifically by way of examples. It should be noted, however, that the following examples are intended to illustrate the invention in more detail and not to limit the scope of the invention. The scope of the present invention is determined by the matters set forth in the claims and the matters reasonably inferred from them.

(( 실시예Example ))

진공용해, 열처리 및 신선을 통하여 하기 표 1과 같은 성분조성을 갖는 가스메탈 아크 용접용 솔리드 와이어를 제조하였다. 이때, 상기 와이어 성분조성간의 구성비를 하기 표 2에 나타내었다.
Solid wire for gas metal arc welding having the composition shown in Table 1 below was produced through vacuum melting, heat treatment and drawing. At this time, composition ratios between the wire component compositions are shown in Table 2 below.

상기 제조된 각각의 솔리드 와이어를 이용하여 약 25kJ/cm의 용접입열량을 적용하여 가스메탈 아크 용접을 실시하였으며, 용접시 보호가스로 100% CO2를 사용하였다. 이때, 용접소재로서 인장강도 800MPa급의 고강도 구조용 강재를 사용하였으며, 상기 가스메탈 아크 용접 후 용접이음부의 성분조성을 하기 표 3에 나타내었다.
Gas metal arc welding was performed using each solid wire manufactured by applying a welding heat input of about 25 kJ / cm and 100% CO 2 was used as a protective gas during welding. In this case, a high strength structural steel material having a tensile strength of 800 MPa was used as the welding material, and the composition of the welded joint after the gas metal arc welding is shown in Table 3 below.

상기 가스메탈 아크 용접 후 형성된 용접이음부의 기계적 물성을 측정하고, 그 결과를 하기 표 4에 나타내었다.The mechanical properties of the welded joint formed after the gas metal arc welding were measured, and the results are shown in Table 4 below.

이때, 상기 기계적 물성을 측정하기 위한 시험편은 각 용접이음부의 중앙부에서 채취하였으며, 인장시험편은 KS규격(KS B 0801) 4호 시험편을 이용하였으며, 인장시험은 크레스 헤드 스피드(cross head speed) 10mm/min에서 시험하였다. 또한, 충격시험편은 KS(KS B 0809) 3호 시험편에 준하여 가공한 후, -20℃에서 샤르피충격시험을 통해 평가하였다.The tensile test was carried out using a KS standard (KS B 0801) No. 4 test piece. The tensile test was carried out at a cross head speed of 10 mm / min. < / RTI > The impact specimens were processed in accordance with KS (KS B 0809) No. 3 test pieces, and then evaluated by Charpy impact test at -20 ° C.

또한, 각각의 형성된 용접이음부의 미세조직을 광학현미경으로 관찰하고, 조직 종류 및 분율에 대해서도 함께 나타내었다.
In addition, the microstructure of each formed welded joint was observed with an optical microscope, and the type and fraction of the structure were also shown.

구분division CC SiSi MnMn PP SS NiNi CrCr MoMo B*B * N*N * TiTi AlAl CuCu 추가
성분Add
ingredient O*O * 발명
예1invent
Example 1 0.050.05 0.20.2 2.452.45 0.0050.005 0.0030.003 2.52.5 0.30.3 0.30.3 1515 4242 0.020.02 0.0050.005 0.40.4 W
0.01W
0.01 88 발명
예2invent
Example 2 0.070.07 0.250.25 2.52.5 0.0060.006 0.0060.006 2.92.9 0.40.4 0.40.4 1414 3636 0.020.02 0.0040.004 0.40.4 Ca
0.001Ca
0.001 55 발명
예3invent
Example 3 0.070.07 0.320.32 2.82.8 0.0080.008 0.0050.005 2.62.6 0.40.4 0.40.4 2222 4040 0.030.03 0.0030.003 0.20.2 V
0.01V
0.01 77 발명
예4invent
Example 4 0.070.07 0.420.42 2.52.5 0.0050.005 0.0060.006 2.72.7 0.30.3 0.50.5 2020 3535 0.020.02 0.0030.003 0.50.5 -- 1010 발명
예5invent
Example 5 0.080.08 0.380.38 2.52.5 0.0050.005 0.0050.005 2.82.8 0.30.3 0.60.6 2626 4545 0.030.03 0.0020.002 0.30.3 Nb
0.01Nb
0.01 99 비교예1Comparative Example 1 0.050.05 0.130.13 1.931.93 0.0110.011 0.0040.004 1.711.71 0.60.6 0.20.2 6969 4040 0.040.04 0.0010.001 0.20.2 -- 1212 비교예2Comparative Example 2 0.060.06 0.060.06 1.251.25 0.0100.010 0.0070.007 1.611.61 0.50.5 0.010.01 2121 4444 0.30.3 0.0070.007 0.30.3 -- 1515 비교예3Comparative Example 3 0.040.04 0.190.19 2.02.0 0.0080.008 0.0040.004 1.751.75 0.030.03 0.550.55 105105 3636 -- -- 0.20.2 -- 1414 비교예4Comparative Example 4 0.060.06 0.280.28 1.561.56 0.0130.013 0.0080.008 2.52.5 0.020.02 1.141.14 5858 3131 0.0120.012 -- 0.50.5 -- 1212 비교예5Comparative Example 5 0.050.05 0.20.2 1.451.45 0.0100.010 0.0050.005 2.52.5 0.30.3 0.30.3 2020 3434 0.020.02 0.0050.005 0.0140.014 W
0.01W
0.01 1212

(상기 표 1에서 B*, N* 및 O*의 단위는 ppm이다.)
(The units of B *, N * and O * in Table 1 are ppm.)

구분division 합금원소 구성비Alloy composition ratio 5C+Si+2Mn5C + Si + 2Mn Mo+2Cr+5Cu+4NiMo + 2Cr + 5Cu + 4Ni 발명예 1Inventory 1 5.45.4 12.912.9 발명예 2Inventory 2 5.65.6 14.814.8 발명예 3Inventory 3 6.36.3 12.612.6 발명예 4Honorable 4 5.85.8 14.414.4 발명예 5Inventory 5 5.85.8 13.913.9 비교예 1Comparative Example 1 4.24.2 9.29.2 비교예 2Comparative Example 2 2.92.9 9.09.0 비교예 3Comparative Example 3 4.44.4 8.68.6 비교예 4Comparative Example 4 3.73.7 13.713.7 비교예 5Comparative Example 5 3.43.4 11.011.0

구분division CC SiSi MnMn PP SS NiNi CrCr MoMo BB NN TiTi AlAl CuCu 추가성분Additional ingredient OO 발명재1Inventory 1 0.040.04 0.20.2 2.42.4 0.0130.013 0.0050.005 2.42.4 0.30.3 0.30.3 1818 5252 0.010.01 0.0030.003 0.350.35 W
0.01W
0.01 340340 발명재2Inventory 2 0.060.06 0.20.2 2.52.5 0.0110.011 0.0060.006 2.52.5 0.40.4 0.40.4 2323 5353 0.010.01 0.0040.004 0.360.36 Ca
0.001Ca
0.001 380380 발명재3Inventory 3 0.060.06 0.30.3 2.52.5 0.0080.008 0.0050.005 2.52.5 0.40.4 0.40.4 2323 5050 0.020.02 0.0030.003 0.210.21 V
0.01V
0.01 350350 발명재4Invention 4 0.070.07 0.40.4 2.42.4 0.0090.009 0.0060.006 2.42.4 0.30.3 0.50.5 1818 4343 0.020.02 0.0030.003 0.460.46 -- 320320 발명재5Invention Article 5 0.070.07 0.330.33 2.52.5 0.010.01 0.0050.005 2.52.5 0.30.3 0.60.6 1919 4545 0.030.03 0.0020.002 0.280.28 Nb
0.01Nb
0.01 380380 비교재1Comparison 1 0.050.05 0.130.13 1.91.9 0.0110.011 0.0040.004 1.71.7 0.60.6 0.20.2 4848 5050 0.020.02 0.0010.001 0.210.21 -- 290290 비교재2Comparative material 2 0.060.06 0.060.06 1.21.2 0.010.01 0.0070.007 1.61.6 0.50.5 0.010.01 2525 7474 0.30.3 0.0070.007 0.320.32 -- 480480 비교재3Comparative material 3 0.040.04 0.170.17 1.91.9 0.0080.008 0.0040.004 1.71.7 0.030.03 0.550.55 8080 5656 -- -- 0.20.2 -- 500500 비교재4Comparison 4 0.040.04 0.200.20 1.561.56 0.0130.013 0.0080.008 2.32.3 0.020.02 1.141.14 3939 7171 0.0120.012 -- 0.50.5 -- 670670 비교재5Comparative material 5 0.050.05 0.170.17 1.451.45 0.010.01 0.0050.005 2.32.3 0.30.3 0.30.3 2222 5252 0.020.02 0.0050.005 0.0140.014 W
0.01W
0.01 440440

구분division 용접이음부 미세조직 (분율%)Welded joint microstructure (fraction%) 용접이음부 기계적 물성Mechanical properties of welded joints AFAF LBLB MM 인장강도 (MPa)Tensile Strength (MPa) vE-20℃(J)vE -20 < 0 > C (J) 발명재 1Inventory 1 2727 7272 1One 904904 8383 발명재 2Inventory 2 2626 7171 33 922922 8383 발명재 3Inventory 3 2828 7070 22 911911 7676 발명재 4Invention 4 2525 7272 33 924924 8686 발명재 5Invention Article 5 2828 7070 22 922922 8282 비교재 1Comparison 1 1616 5353 3131 837837 1616 비교재 2Comparative material 2 1515 5050 3535 844844 2626 비교재 3Comparative material 3 2424 4040 3636 851851 4444 비교재 4Comparison 4 1515 4545 4040 973973 2828 비교재 5Comparative material 5 1717 3434 4949 996996 3939

(상기 표 4에서 AF: 침상페라이트(acicular ferrite), LB: 하부 베이나이트(lower bainite), M: 마르텐사이트(martensite)를 의미한다.)
(AF: acicular ferrite in Table 4, LB: lower bainite, and M: martensite).

상기 표 4에 나타낸 바와 같이, 본 발명에 따른 가스메탈 아크 용접용 솔리드 와이어를 이용하여 가스메탈 아크 용접을 실시하는 경우(발명재 1 내지 5), 900MPa 이상의 고강도 물성을 가지면서, 동시에 충격인성이 우수한 용접이음부를 확보할 수 있었다.
As shown in Table 4, when the gas metal arc welding was performed using the solid metal wire for gas metal arc welding according to the present invention (invention materials 1 to 5), it was confirmed that impact strength of 900 MPa or more, Excellent weld joints could be secured.

반면, 솔리드 와이어의 성분조성이 본 발명에서 제안하는 바를 만족하지 아니한 와이어를 이용한 경우(비교재 1 내지 5)에는 강도 및 충격인성 중 하나 이상의 물성이 열위하였으며, 특히 용접이음부의 미세조직 중 침상 페라이트의 분율이 충분히 형성되지 못함에 따라 모든 경우에서 충격인성이 열위한 것을 확인할 수 있다.On the other hand, in the case of using a wire in which the composition of the solid wire does not satisfy the requirements of the present invention (comparative materials 1 to 5), at least one of strength and impact toughness is poor, It can be confirmed that impact toughness is heated in all cases because the fraction of ferrite is not sufficiently formed.

Claims (6)

솔리드 와이어 전체 중량을 기준으로, 탄소(C): 0.03~0.1%, 실리콘(Si): 0.1~0.5%, 망간(Mn): 2.0~3.0%, 니켈(Ni): 2.0~3.5%, 크롬(Cr): 0.1~0.6%, 몰리브덴(Mo): 0.3~1.0%, 티타늄(Ti): 0.01~0.05%, 구리(Cu): 0.1~0.6%, 보론(B): 0.0005~0.003%, 알루미늄(Al): 0.001~0.01%, 질소(N): 0.005% 이하, 산소(O): 0.003% 이하, 인(P): 0.03% 이하, 황(S): 0.03% 이하, 잔부 Fe 및 불가피한 불순물을 포함하고,
5 ≤ (5C+Si+2Mn) ≤ 7, 12 ≤ (Mo+2Cr+5Cu+4Ni) ≤ 15를 만족하는 것인, 가스메탈 아크 용접용 솔리드 와이어.
(C): 0.03 to 0.1%, silicon (Si): 0.1 to 0.5%, manganese (Mn): 2.0 to 3.0%, nickel (Ni): 2.0 to 3.5%, chromium 0.1 to 0.6% of Cr, 0.3 to 1.0% of molybdenum, 0.01 to 0.05% of titanium, 0.1 to 0.6% of copper, 0.0005 to 0.003% of boron, (P): 0.03% or less; sulfur (S): 0.03% or less; the remainder Fe and unavoidable impurities are contained in an amount of 0.001 to 0.01% Including,
5? 5C + Si + 2Mn? 7, and 12? Mo + 2Cr + 5Cu + 4Ni? 15.
제 1항에 있어서,
상기 와이어는 중량%로, 니오븀(Nb): 0.001~0.1%, 바나듐(V): 0.001~0.1% 및 텅스텐(W): 0.01~0.5%로 구성되는 그룹에서 선택된 1종 또는 2종 이상을 더 포함하는 것인, 가스메탈 아크 용접용 솔리드 와이어.
The method according to claim 1,
The wire may further contain one or more kinds selected from the group consisting of 0.001 to 0.1% of niobium (Nb), 0.001 to 0.1% of vanadium (V) and 0.01 to 0.5% of tungsten (W) The solid wire for gas metal arc welding.
제 1항에 있어서,
상기 와이어는 중량%로, 칼슘(Ca): 0.0005~0.005% 및 희토류 원소(REM): 0.005~0.05% 중 1종 또는 2종을 더 포함하는 것인, 가스메탈 아크 용접용 솔리드 와이어.
The method according to claim 1,
Wherein the wire further comprises one or two of Ca: 0.0005 to 0.005% and REM: 0.005 to 0.05% by weight.
제 1항에 있어서,
상기 와이어를 이용한 용접시 보호가스는 100% CO2 또는 Ar-CO2 혼합가스를 사용하는 것인, 가스메탈 아크 용접용 솔리드 와이어.
The method according to claim 1,
Wherein the protective gas used for welding using the wire is a gas mixture of 100% CO 2 or Ar-CO 2 .
제 1항에 있어서,
상기 와이어를 이용하여 형성된 용접이음부의 미세조직은 면적분율로 20~30%의 침상 페라이트 및 70~80%의 하부 베이나이트를 포함하는 것인, 가스메탈 아크 용접용 솔리드 와이어.
The method according to claim 1,
Wherein the microstructure of the welded joint formed using the wire comprises 20 to 30% of needle-like ferrite and 70 to 80% of lower bainite in an area fraction.
제 1항에 있어서,
상기 와이어를 이용하여 형성된 용접이음부의 인장강도는 900Mpa 이상이고, -20℃에서의 충격인성이 70J 이상인 것인, 가스메탈 아크 용접용 솔리드 와이어.
The method according to claim 1,
Wherein the welded joint formed by the wire has a tensile strength of 900 MPa or more and an impact toughness at -20 캜 of 70 J or more.
KR1020130163193A 2013-12-24 2013-12-24 Solid wire for gas-metal arc welding KR101568517B1 (en)

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CN201380081880.3A CN105848820B (en) 2013-12-24 2013-12-24 The excellent superhigh intensity gas metal arc welding connector of impact flexibility and the welding wire for making it
PCT/KR2013/012149 WO2015099219A1 (en) 2013-12-24 2013-12-24 Ultrahigh-strength gas metal arc welded joint having excellent impact toughness, and solid wire for producing same
DE112013007707.8T DE112013007707B4 (en) 2013-12-24 2013-12-24 Ultra-high strength gas metal arc welding joint with excellent notched impact strength and solid wire to produce the same
US15/104,707 US10266929B2 (en) 2013-12-24 2013-12-24 Ultrahigh-strength gas metal arc welded joint having excellent impact toughness, and solid wire for producing same
KR1020130163193A KR101568517B1 (en) 2013-12-24 2013-12-24 Solid wire for gas-metal arc welding
JP2016542266A JP6576348B2 (en) 2013-12-24 2013-12-24 Super high strength gas metal arc welded joint with excellent impact toughness
JP2017225099A JP6803825B2 (en) 2013-12-24 2017-11-22 Solid wire for manufacturing ultra-high strength gas metal arc welded joints with excellent impact toughness

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KR101982160B1 (en) * 2016-12-23 2019-08-28 주식회사 포스코 Welding joint of thick steel plate having excellent low temperature toughness and welding method of the same
KR102195473B1 (en) * 2019-11-27 2020-12-29 고려용접봉 주식회사 WELDING WIRE FOR MODIFIED 9Cr-1Mo STEEL
CN114769933A (en) * 2022-04-07 2022-07-22 江西恒大高新技术股份有限公司 Inconel 625 modified alloy surfacing welding wire and preparation method thereof

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JP2005046877A (en) 2003-07-29 2005-02-24 Jfe Steel Kk Steel wire for carbon dioxide gas-shielded arc welding, and welding method using the same
JP2006000868A (en) * 2004-06-15 2006-01-05 Nippon Steel Corp Solid wire for gas shielded arc welding for primary build-up welding

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JP2005046877A (en) 2003-07-29 2005-02-24 Jfe Steel Kk Steel wire for carbon dioxide gas-shielded arc welding, and welding method using the same
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