KR20150068696A - Filler wire, Method for welding using the same in hot press forming and Method for manufacturing of steel plate - Google Patents
Filler wire, Method for welding using the same in hot press forming and Method for manufacturing of steel plate Download PDFInfo
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- KR20150068696A KR20150068696A KR1020130154658A KR20130154658A KR20150068696A KR 20150068696 A KR20150068696 A KR 20150068696A KR 1020130154658 A KR1020130154658 A KR 1020130154658A KR 20130154658 A KR20130154658 A KR 20130154658A KR 20150068696 A KR20150068696 A KR 20150068696A
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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
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
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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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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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
- B23K35/02—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
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- 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]
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- 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]
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- 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]
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- 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]
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- 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]
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- 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]
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- 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]
Abstract
Description
본 발명은 필러 와이어, 이를 사용하는 열간성형강의 용접방법 및 강판 제조방법에 관한 것으로, 더욱 상세하게는, 절단된 강판을 레이저를 사용하여 맞대기 용접하는데 적용되는 필러 와이어, 이를 사용하는 열간성형강의 용접방법 및 강판 제조방법에 관한 것이다. The present invention relates to a filler wire, a method for welding a hot-formed steel using the same, and a method for manufacturing a steel sheet, and more particularly, to a filler wire used for butt welding a cut steel plate using a laser, And a method for manufacturing a steel sheet.
테일러드 블랭크 용접(Tailor Welded Blanks 이하, TWB라 한다)이란, 서로 다른 재질과 두께의 강판을 용도에 맞춰 재단한 뒤 레이저로 용접하는 공법을 말한다. 최근 자동차 연비 개선 및 안전도 향상을 위해 채용되는 공법이다.Tailor Welded Blanks (hereinafter referred to as "TWB") refers to a method of laser welding after cutting steel plates of different materials and thickness to suit their application. Recently, it is adopted to improve automobile fuel efficiency and safety.
대한민국 등록특허 제10-0743366호(2007.07.26. 공고, 이하, 본 문헌이라 한다.)에서는 TWB 공정을 개시하고 있다. 본 문헌에서 개시된 바와 같이, TWB 공정은 부품 특성에 맞게 두 개의 파트 이상의 동종 또는 이종의 재질과 두께가 상이한 강판을 절단하는 절단공정과. 절단된 강판을 맞대기 용접하는 용접공정과, 용접된 강판을 성형하는 프레스 공정으로 이루어진다.Korean Patent No. 10-0743366 (published on July 26, 2007, hereinafter referred to as "the present document") discloses a TWB process. As disclosed in this document, the TWB process includes a cutting process for cutting a steel sheet having a thickness different from that of the same or different materials of two or more parts in accordance with the characteristics of the parts. A welding step of butt-welding the cut steel sheet, and a pressing step of forming a welded steel sheet.
이때, 용접공정은 레이저를 이용하여 진행될 수 있다. 레이저를 이용한 용접은 타 용접법에 비해 용접속도가 빠르고 입열량이 적어 열변형이 작은 이점이 있고, 비드 외관이 미려할 뿐만 아니라 정밀성, 안정성이 높은 이점이 있다. At this time, the welding process can be performed using a laser. Welding using laser has advantages such as high welding speed and small heat input due to low heat input and excellent bead appearance as well as high precision and stability compared to other welding methods.
한편, 열간성형(HPF:Hot Press Forming)강은 고온으로 가열 후, 강판이 금형 내부에서 성형과 동시에 급격히 냉각되어 고강도 특성(예를 들어, 1500Mpa)을 가지게 된다. On the other hand, a hot press forming (HPF) steel is rapidly heated in a mold at the same time as a steel plate is heated in a high temperature and has high strength characteristics (for example, 1500 MPa).
이러한 열간성형강은 소재의 경화능을 형상시키기 위하여 보론(B)이 첨가되며, 고온으로 가열되는 동안 강판의 고온 산화를 방지하기 위해 Al-Si 도금층이 형성된다.The hot-formed steel is doped with boron (B) to shape the hardenability of the material, and an Al-Si plated layer is formed to prevent high-temperature oxidation of the steel sheet while being heated to a high temperature.
그런데 레이저를 사용한 TWB의 용접공정 중, 용입부에 Al-Si 도금층이 혼입되어 용접부의 강도를 저하시키는 문제점이 있다. 때문에. 용접공정 중에 Al-Si 도금층을 제거하는 공정이 추가로 필요하다. 그러나 Al-Si 도금층을 제거하는 공정 및 이를 구현하는 기술이 아직 미정립 단계에 있다. 특히, Al-Si 도금층을 제거하기 위해서는 레이저를 이용한 제거설비(Ablation laser)가 필요하다. 그 결과, 강판을 생산하는데 있어서, 생산성이 떨어지고, 제조원가가 증가하는 문제점이 있다.However, there is a problem in that during the welding process of the TWB using the laser, the Al-Si plating layer is mixed in the penetration portion to lower the strength of the welded portion. Because of. A step of removing the Al-Si plating layer during the welding process is further required. However, the process of removing the Al-Si plating layer and the technology for implementing the process are still not yet established. Particularly, in order to remove the Al-Si plating layer, an ablation laser is required. As a result, there is a problem that the productivity is lowered and the manufacturing cost is increased in producing the steel sheet.
이에, 본 발명은 상기한 문제점을 해결하기 위한 것으로, Al-Si 도금층을 제거하는 공정을 생략하고, Al-Si 도금층이 형성된 강판의 용접부의 강도를 확보할 수 있는 필러 와이어, 이를 사용하는 열간성형강의 용접방법 및 강판 제조방법을 제공하는 것을 그 목적으로 한다.Accordingly, the present invention has been made to solve the above problems, and it is an object of the present invention to provide a filler wire capable of omitting the step of removing the Al-Si plating layer and securing the strength of the welded portion of the steel sheet on which the Al- A steel welding method and a steel plate manufacturing method.
본 발명이 해결하고자 하는 과제는 이상에서 언급된 과제에 국한되지 않으며 여기서 언급되지 않은 또 다른 과제들은 아래의 기재로부터 당업자에게 명확하게 이해될 수 있을 것이다.The problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned here can be understood by those skilled in the art from the following description.
상기 목적을 달성하기 위한 본 발명은, Al-Si의 도금층을 갖는 열간성형 부재용 강판에 대한 레이저를 사용한 맞대기 용접에 사용되는 필러 와이어로서, 상기 필러 와이어는 중량%로, 탄소(C):0.06~0.08%, 실리콘(Si):0.07~0.09%, 망간(Mn):1.6~2.0%, 인(P):0.015%~0.020%, 황(S):0.005~0.007%, 몰리브덴(Mo): 0.25~0.30%, 티타늄(Ti): 0.12~0.18% 이하 및 나머지 철(Fe)과 불가피한 불순물로 이루어지는 필러 와이어를 제공할 수 있다.
In order to accomplish the above object, the present invention is a filler wire used for butt welding using a laser for a hot-formed member steel plate having a plated layer of Al-Si, wherein the filler wire contains 0.06 (Si): 0.07 to 0.09%, manganese (Mn): 1.6 to 2.0%, phosphorus (P): 0.015 to 0.020%, sulfur (S): 0.005 to 0.007%, molybdenum (Mo) 0.25 to 0.30% of titanium (Ti), 0.12 to 0.18% or less of titanium, and the remaining iron (Fe) and unavoidable impurities.
상기 목적을 달성하기 위한 다른 발명은, 중량%로, 탄소(C):0.06~0.08%, 실리콘(Si):0.07~0.09%, 망간(Mn):1.6~2.0%, 인(P):0.015%~0.020%, 황(S):0.005~0.007%, 몰리브덴(Mo): 0.25~0.30%, 티타늄(Ti): 0.12~0.18% 이하 및 나머지 철(Fe)과 불가피한 불순물로 이루어지는 필러 와이어를 사용하여, Al-Si의 도금층을 갖는 열간성형 부재용 강판을 레이저로 맞대기 용접하는 열간성형강의 용접방법을 제공할 수 있다.Another aspect of the present invention for achieving the above object is a manufacturing method of a semiconductor device, comprising: 0.06 to 0.08% of carbon (C), 0.07 to 0.09% of silicon (Si), 1.6 to 2.0% of manganese (Mn) (Fe) and unavoidable impurities is used as a filler in a molybdenum (Mo) content of 0.2 to 0.30%, a content of sulfur (S) of 0.005 to 0.007%, a content of molybdenum (Mo) of 0.12 to 0.18% To provide a method of welding a hot-formed steel in which a steel sheet for a hot-formed member having a plated layer of Al-Si is butt welded with a laser.
바람직하게는, 상기 레이저의 출력은 3.08kW이고, 용접속도는 4.4m/min이며, 분위기가스의 공급량은 20ℓ/min이고, 상기 필러 와이어의 공급속도는 1.0m/min인 용접조건에서, 상기 필러 와이어는, 중량%로, 탄소(C):0.06%, 실리콘(Si):0.81%, 망간(Mn):1.85%, 인(P):0.018%, 황(S):0.007%, 몰리브덴(Mo): 0.27%, 티타늄(Ti): 0.15% 이하 및 나머지 철(Fe)과 불가피한 불순물로 이루어질 수 있다.Preferably, under the welding condition that the output of the laser is 3.08 kW, the welding speed is 4.4 m / min, the supply amount of the atmospheric gas is 20 L / min and the feed rate of the filler wire is 1.0 m / min, The wire is composed of 0.06% of carbon (C), 0.81% of silicon (Si), 1.85% of manganese (Mn), 0.018% of phosphorus (P), 0.007% of sulfur (S) ): 0.27%, titanium (Ti): 0.15% or less, and the balance of iron (Fe) and unavoidable impurities.
바람직하게는, 상기 강판의 Al-Si의 도금층의 두께는 30μm 내지 40μm일 수 있다.Preferably, the thickness of the Al-Si plated layer of the steel sheet may be 30 탆 to 40 탆.
바람직하게는, 상기 분위기 가스는 중량%로, 아르곤(Ar) 82%, 이산화탄소(CO2)12%일 수 있다.
Preferably, the atmospheric gas may be 82% by weight of argon (Ar) and 12% of carbon dioxide (CO2) by weight.
상기 목적을 달성하기 위한 또 다른 발명은, Al-Si의 도금층을 갖는 열간성형 부재용 강판을 절단하는 절단공정과, 중량%로, 탄소(C):0.06~0.08%, 실리콘(Si):0.07~0.09%, 망간(Mn):1.6~2.0%, 인(P):0.015%~0.020%, 황(S):0.005~0.007%, 몰리브덴(Mo): 0.25~0.30%, 티타늄(Ti): 0.12~0.18% 이하 및 나머지 철(Fe)과 불가피한 불순물로 이루어지는 필러 와이어를 사용하여 레이저로 절단된 강판을 맞대기 용접하는 용접공정과, 상기 용접공정 후, 용접된 상기 강판을 900°C로 열처리하는 열처리공정 및 상기 열처리공정 후 열처리된 상기 강판을 냉각 처리하면서, 상기 강판을 프레스하여 성형하는 성형 및 냉각처리 공정을 포함하는 강판 제조 방법을 제공할 수 있다.According to another aspect of the present invention, there is provided a method of manufacturing a hot-formed member, comprising: cutting a steel sheet for a hot-formed member having a plated layer of Al-Si; (P): 0.015 to 0.020%, sulfur (S): 0.005 to 0.007%, molybdenum (Mo): 0.25 to 0.30%, titanium (Ti) 0.12 to 0.18% or less and the remaining iron (Fe) and inevitable impurities; and a step of heat-treating the steel sheet welded at 900 ° C after the welding step And a forming and cooling treatment step of pressing and shaping the steel sheet while cooling the steel sheet subjected to the heat treatment after the heat treatment step and the heat treatment step.
본 발명의 일 실시예에 따르면, 망간(Mn) 1.85%을 포함하는 필러와이어를 사용하여 오스테나이트 영역으로 변태를 안정화시키고 냉간성형 시 마른텐사이트 조직 변태로 용접부의 강도를 확보하도록 구성함으로써, Al-Si 도금층을 제거하는 공정을 생략하고, Al-Si 도금층이 형성된 강판의 용접부의 강도를 확보하는 유리한 효과를 제공한다.According to one embodiment of the present invention, a transformer is stabilized into austenite region using filler wire containing 1.85% manganese (Mn), and the strength of the welded portion is secured by the dry tension texture transformation during cold forming, The step of removing the Si plating layer is omitted and an advantageous effect of securing the strength of the welded portion of the steel sheet on which the Al-Si plating layer is formed is provided.
도 1은 본 발명의 바람직한 일 실시예에 따른 필러와이어를 사용하여 수행되는 레이저용접을 도시한 도면.
도 2는 본 발명의 바람직한 일 실시예에 따른 열간성형강의 용접방법을 도시한 도면이다.BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a diagram illustrating laser welding performed using a filler wire according to a preferred embodiment of the present invention.
2 is a view showing a welding method of a hot-formed steel according to a preferred embodiment of the present invention.
이하, 본 발명의 바람직한 실시예를 첨부된 도면들을 참조하여 상세히 설명한다. 본 발명의 목적, 특정한 장점들 및 신규한 특징들은 첨부된 도면들과 연관되는 이하의 상세한 설명과 바람직한 실시예들로부터 더욱 명백해질 것이다. 그리고 본 명세서 및 특허청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정하여 해석되어서는 아니 되며, 발명자는 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해서 용어의 개념을 적절하게 정의할 수 있다는 원칙에 입각하여, 본 발명의 기술적 사상에 부합되는 의미와 개념으로 해석되어야만 한다. 그리고 본 발명을 설명함에 있어서, 본 발명의 요지를 불필요하게 흐릴 수 있는 관련된 공지기술에 대한 상세한 설명은 생략한다.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages, and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. The terms and words used in the present specification and claims should not be construed to be limited to ordinary or dictionary terms and the inventor should properly define the concept of the term in order to describe its own invention in the best way. The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
도 1은 본 발명의 바람직한 일 실시예에 따른 필러와이어를 사용하여 수행되는 레이저용접을 도시한 도면이다.
1 is a view illustrating laser welding performed using a filler wire according to a preferred embodiment of the present invention.
TWB는 절단된 제1 강판(1)과 제2 강판(2)을 맞대기 용접한다. 제1 강판(1)과 제2 강판(2)은 각각 소정의 두께(t3)를 갖는 Al-Si 도금층(1a,2a)이 형성된다. 그리고 제1 강판(1)의 두께(t1)는 제2 강판(2)의 두께(t2)와 상호 다를 수 있다. The TWB welds the
제1 강판(1) 및 제2 강판(2)의 기준은 다음과 같이 설정하였다.The standards of the
제1 강판(1) 및 제2 강판(2)의 Al-Si 도금층(1a,2a)은 30μm 내지 40μm로 하였다. 제1 강판(1)의 두께(t1)은 1.4mm로 하였으며, 제2 강판(2)의 두께(t2)는 1.1mm로 하였다.
The thickness of the Al-Si plated
필러 와이어 공급부(10)는 용접부를 향하여 필러 와이어(Filler wire)를 공급한다. 레이저 용접부(20)는 용접부에 레이저 빔을 주사한다.
The
용접조건은 다음과 같이 설정하였다.The welding conditions were set as follows.
* 레이저 용접기 : Nd-YAG 고체 레이저 용접기* Laser welding machine: Nd-YAG solid state laser welding machine
* 레이저 용접기 출력 : 3.08kW* Laser welder output: 3.08kW
* 용접속도 : 4.4mm/min* Welding speed: 4.4mm / min
* 분위기 가스 : 아르곤(Ar) 82%, 이산화탄소(CO2)12%의 혼합가스Atmosphere gas: 82% of argon (Ar), 12% of carbon dioxide (CO2)
* 분위기 가스의 공급량 : 20ℓ/min* Amount of atmosphere gas supplied: 20 t / min
* 필러 와이어 직경 : 1.2mm* Filler wire diameter: 1.2mm
* 필러 와이어 공급속도 : 1.0m/min
* Filler wire feed rate: 1.0m / min
여기서, 필러 와이어(100)는 중량%로, 탄소(C):0.06~0.08%, 실리콘(Si):0.07~0.09%, 망간(Mn):1.6~2.0%, 인(P):0.015%~0.020%, 황(S):0.005~0.007%, 몰리브덴(Mo): 0.25~0.30%, 티타늄(Ti): 0.12~0.18% 이하 및 나머지 철(Fe)과 불가피한 불순물로 이루어질 수 있다.Here, the
여기서, 망간(Mn)은 강의 강도 및 인성을 증가시키고 강의 소입성을 증가시키는 원소로서, 망간의 첨가는 탄소의 첨가보다도 강도 상승시 연성의 저하가 적다. 망간은 강판 전체 중량의 1.6~2.0 중량%로 첨가되는 것이 바람직하다. 망간이 첨가량이 1.6 중량% 미만일 경우, 그 첨가 효과가 불충분하다. 반대로, 망간의 첨가량이 2.0중량%를 초과하는 경우, MnS계 비금속개재물을 과다하게 생성하여, 용접시 크랙 발생 등 용접성을 저하시킬 수 있다.Here, manganese (Mn) is an element which increases the strength and toughness of the steel and increases the incombustibility of the steel. The addition of manganese causes less deterioration of ductility when the strength is increased than that of carbon. Manganese is preferably added in an amount of 1.6 to 2.0% by weight based on the total weight of the steel sheet. When the addition amount of manganese is less than 1.6% by weight, the effect of addition thereof is insufficient. On the other hand, when the addition amount of manganese exceeds 2.0% by weight, MnS-based nonmetallic inclusions are excessively generated, and weldability such as cracking can be reduced.
바람직하게는, 중량%로, 탄소(C):0.06%, 실리콘(Si):0.81%, 망간(Mn):1.85%, 인(P):0.018%, 황(S):0.007%, 몰리브덴(Mo): 0.27%, 티타늄(Ti): 0.15% 이하 및 나머지 철(Fe)과 불가피한 불순물로 이루어질 수 있다.
(C): 0.06%, silicon (Si): 0.81%, manganese (Mn): 1.85%, phosphorus (P): 0.018%, sulfur (S): 0.007%, molybdenum Mo): 0.27%, titanium (Ti): 0.15% or less, and the balance of iron (Fe) and unavoidable impurities.
이렇게 Al-Si 도금층(1a,2a)이 형성된 제1 강판(1)과 제2 강판(2)을 위와 같은 필러 와이어(100)를 통해 용접함으로써, 용접부에 Al 성분이 혼입되는 것을 방지하여 용접부의 강도를 확보할 수 있다.By welding the
특히, 필러 와이어(100)는 망간(Mn)이 중량%로 1.85% 함유되어 열처리 공정(900°C)에서 오스테나이트 영역으로 변태를 안정화시킬 수 있다. 그 결과, 냉간성형 시에 마르텐사이트 영역으로 조직 변태가 가능하여 용접부의 강도를 확보할 수 있다.
Particularly, the
도 2는 본 발명의 바람직한 일 실시예에 따른 열간성형강의 용접방법을 도시한 도면이다.2 is a view showing a welding method of a hot-formed steel according to a preferred embodiment of the present invention.
도 2를 참조하여, 위와 같은 필러 와이어(100)를 사용한 강판 제조 방법을 설명한다.2, a method of manufacturing a steel sheet using the
Al-Si의 도금층을 갖는 열간성형 부재용 강판을 절단 장치를 통해 용도에 맞게 절단한다.(S100) 절단된 강판은 맞대기 용접이 수행되기 때문에 강판의 절단면이 균일하게 형성되도록 절단되는 것이 중요하다.
The steel sheet for a hot-formed member having a plated layer of Al-Si is cut through a cutting device to suit the application. (S100) Since the steel sheet to be cut is subjected to butt welding, it is important that the cut surface of the steel sheet is cut so as to be uniformly formed.
다음으로, 절단된 강판을 레이저를 사용하여 맞대기 용접한다.(S200) 레이저 용접부(20)는 3.08kW출력과 4.4mm/min의 용접속도로 용접을 진행한다. 용접 전, 표면검출기를 통해 강판의 상호 다른 두께간 허용간격의 상태를 검사할 수 있다.Next, the cut steel plate is butt welded using a laser (S200). The
필러 와이어 공급부(10)는 중량%로, 탄소(C):0.06%, 실리콘(Si):0.81%, 망간(Mn):1.85%, 인(P):0.018%, 황(S):0.007%, 몰리브덴(Mo): 0.27%, 티타늄(Ti): 0.15% 이하 및 나머지 철(Fe)과 불가피한 불순물로 이루어진 필러 와이어(100)를 용접부에 공급한다. 이때, 필러 와이어 직경(100) 1.2mm일 수 있으며, 필러 와이어 (100)의 공급속도는 1.0m/min 일 수 있다.
The filler
다음으로, 용접공정 후, 용접된 강판을 900°C로 7분간 열처리한다.(S300) 열처리를 통해 강판의 용접부는 오스테나이트로 변태가 안정화된다.
Next, after the welding process, the welded steel sheet is heat-treated at 900 ° C for 7 minutes (S300). Through the heat treatment, the welded portion of the steel sheet is stabilized in transformation to austenite.
다음으로, 열처리공정 후 열처리된 강판을 20초간 급속 냉각 처리하면서, 강판을 프레스하여 성형한다.(S400) 냉각 처리 시, 마르텐사이트 조직 변태로 용접부의 강도를 확보할 수 있다.
Next, the steel sheet subjected to heat treatment after the heat treatment step is rapidly cooled for 20 seconds, and the steel sheet is pressed and molded. (S400) During the cooling treatment, the strength of the welded portion can be secured by the martensitic transformation.
이러한 본 발명의 바람직한 일 실시예에 따른 강판 제조 방법를 통하여 용접부의 고강도 특성을 확보할 수 있게 된다. 구체적으로, 통상적인 필러 와이어를 사용한 경우, 용접부의 인장강도는 1000MPa 수준을 나타내었으나, 일 실시예에 따른 필러 와어어를 사용한 경우, 종래 대비 30% 향상된 1,345MPa까지 향상된 용접강도를 확보할 수 있다.
The high strength characteristics of the welded portion can be ensured through the steel sheet manufacturing method according to the preferred embodiment of the present invention. Specifically, when a typical filler wire is used, the tensile strength of the welded portion is 1000 MPa. However, when the filler wire according to one embodiment is used, an improved weld strength can be secured up to 1,345 MPa, which is 30% .
이상으로 본 발명의 바람직한 하나의 실시예에 따른 필러 와이어, 이를 사용하는 열간성형강의 용접방법 및 강판 제조방법에 관하여 첨부된 도면을 참조하여 구체적으로 살펴보았다.As described above, the filler wire according to one preferred embodiment of the present invention, the method of welding a hot-formed steel using the same, and the method of manufacturing a steel sheet have been specifically described with reference to the accompanying drawings.
이상의 설명은 본 발명의 기술 사상을 예시적으로 설명한 것에 불과한 것으로서, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 본 발명의 본질적인 특성에서 벗어나지 않는 범위 내에서 다양한 수정, 변경 및 치환이 가능할 것이다. 따라서, 본 발명에 개시된 실시예 및 첨부된 도면들은 본 발명의 기술 사상을 한정하기 위한 것이 아니라 설명하기 위한 것이고, 이러한 실시예 및 첨부된 도면에 의하여 본 발명의 기술 사상의 범위가 한정되는 것은 아니다. 본 발명의 보호 범위는 아래의 청구범위에 의하여 해석되어야 하며, 그와 동등한 범위 내에 있는 모든 기술 사상은 본 발명의 권리범위에 포함되는 것으로 해석되어야 할 것이다. It will be apparent to those skilled in the art that various modifications, substitutions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. will be. Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.
1: 제1 강판
2: 제2 강판
1a,2a: Al-Si 도금층
10: 필러 와이어 공급부
20: 레이저 용접부
100: 필러 와이어1: First steel plate
2: Second steel plate
1a, 2a: Al-Si plating layer
10: Filler wire supply part
20: laser welding part
100: Filler wire
Claims (6)
상기 필러 와이어는 중량%로, 탄소(C):0.06~0.08%, 실리콘(Si):0.07~0.09%, 망간(Mn):1.6~2.0%, 인(P):0.015%~0.020%, 황(S):0.005~0.007%, 몰리브덴(Mo): 0.25~0.30%, 티타늄(Ti): 0.12~0.18% 이하 및 나머지 철(Fe)과 불가피한 불순물로 이루어지는 필러 와이어. A filler wire used for butt welding using a laser for a hot-formed member steel plate having a plated layer of Al-Si,
The filler wire may contain 0.06 to 0.08% of carbon (C), 0.07 to 0.09% of silicon (Si), 1.6 to 2.0% of manganese (Mn), 0.015 to 0.020% of phosphorus (P) (Fe) and unavoidable impurities in an amount of 0.005 to 0.007% of molybdenum (S), 0.25 to 0.30% of molybdenum (Mo), 0.12 to 0.18% of titanium (Ti)
상기 레이저의 출력은 3.08kW이고, 용접속도는 4.4m/min이며, 분위기가스의 공급량은 20ℓ/min이고, 상기 필러 와이어의 공급속도는 1.0m/min인 용접조건에서, 상기 필러 와이어는, 중량%로, 탄소(C):0.06%, 실리콘(Si):0.81%, 망간(Mn):1.85%, 인(P):0.018%, 황(S):0.007%, 몰리브덴(Mo): 0.27%, 티타늄(Ti): 0.15% 이하 및 나머지 철(Fe)과 불가피한 불순물로 이루어지는 열간성형강의 용접방법.3. The method of claim 2,
The filler wire had a weight of 3.08 kW, a welding speed of 4.4 m / min, an atmospheric gas supply rate of 20 l / min, and a feed rate of the filler wire of 1.0 m / min. (P): 0.018%, sulfur (S): 0.007%, molybdenum (Mo): 0.27%, carbon (C): 0.06%, silicon (Si): 0.81%, manganese , Titanium (Ti): 0.15% or less, and the balance of iron (Fe) and unavoidable impurities.
상기 강판의 Al-Si의 도금층의 두께는 30μm 내지 40μm인 열간성형강의 용접방법.The method of claim 3,
Wherein the thickness of the Al-Si plating layer of the steel sheet is 30 占 퐉 to 40 占 퐉.
상기 분위기 가스는 중량%로, 아르곤(Ar) 82%, 이산화탄소(CO2)12%인 열간성형강의 용접방법.5. The method of claim 4,
Wherein the atmospheric gas is 82% by weight of argon (Ar) and 12% by weight of carbon dioxide (CO2).
중량%로, 탄소(C):0.06~0.08%, 실리콘(Si):0.07~0.09%, 망간(Mn):1.6~2.0%, 인(P):0.015%~0.020%, 황(S):0.005~0.007%, 몰리브덴(Mo): 0.25~0.30%, 티타늄(Ti): 0.12~0.18% 이하 및 나머지 철(Fe)과 불가피한 불순물로 이루어지는 필러 와이어를 사용하여 레이저로 절단된 강판을 맞대기 용접하는 용접공정;
상기 용접공정 후, 용접된 상기 강판을 900°C로 열처리하는 열처리공정;및
상기 열처리공정 후 열처리된 상기 강판을 냉각 처리하면서, 상기 강판을 프레스하여 성형하는 성형 및 냉각처리 공정
을 포함하는 강판 제조 방법.A cutting step of cutting a steel sheet for a hot-formed member having a plated layer of Al-Si;
(Si): 0.07 to 0.09%, manganese (Mn): 1.6 to 2.0%, phosphorus (P): 0.015 to 0.020%, sulfur (S) The steel sheet cut with a laser is butt welded using a filler wire composed of 0.005 to 0.007% of molybdenum (Mo), 0.25 to 0.30% of titanium (Ti), and 0.12 to 0.18% or less of remaining iron (Fe) and inevitable impurities Welding process;
A heat treatment step of heat-treating the welded steel sheet at 900 ° C after the welding step;
A cooling and shaping step of pressing and shaping the steel sheet while cooling the steel sheet subjected to the heat treatment after the heat treatment step
Wherein the steel sheet is a steel sheet.
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| CN113967789A (en) * | 2020-07-22 | 2022-01-25 | 中国科学院上海光学精密机械研究所 | Laser tailor-welding method for aluminum-silicon coated steel |
| WO2022016929A1 (en) * | 2020-07-22 | 2022-01-27 | 中国科学院上海光学精密机械研究所 | Laser tailor welding method of aluminum-silicon coated steel |
| CN111975242A (en) * | 2020-07-31 | 2020-11-24 | 鞍钢钢材加工配送（长春）有限公司 | Soldering paste and process for improving plasticity of welding joint of hot forming steel tailor-welded blank with aluminum-silicon coating |
| CN111975242B (en) * | 2020-07-31 | 2021-12-21 | 鞍钢钢材加工配送（长春）有限公司 | Soldering paste and process for improving plasticity of welding joint of hot forming steel tailor-welded blank with aluminum-silicon coating |
| CN115433880A (en) * | 2022-08-22 | 2022-12-06 | 包头钢铁（集团）有限责任公司 | Low-cost submerged arc welding wire and production method thereof |
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| KR101562987B1 (en) | 2015-10-23 |
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