KR20120089975A - Welding method for hot stamping coating steel sheets - Google Patents

Welding method for hot stamping coating steel sheets Download PDF

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KR20120089975A
KR20120089975A KR1020110002814A KR20110002814A KR20120089975A KR 20120089975 A KR20120089975 A KR 20120089975A KR 1020110002814 A KR1020110002814 A KR 1020110002814A KR 20110002814 A KR20110002814 A KR 20110002814A KR 20120089975 A KR20120089975 A KR 20120089975A
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steel sheet
boron steel
laser
jig
coated boron
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KR1020110002814A
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Korean (ko)
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KR101246909B1 (en
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정병훈
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엔케이에스주식회사
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20Bonding
    • B23K26/21Bonding by welding
    • B23K26/24Seam welding
    • B23K26/26Seam welding of rectilinear seams
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/062Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
    • B23K26/0626Energy control of the laser beam
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/12Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
    • B23K26/123Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20Bonding
    • B23K26/32Bonding taking account of the properties of the material involved
    • B23K26/322Bonding taking account of the properties of the material involved involving coated metal parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/60Preliminary treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/38Selection of media, e.g. special atmospheres for surrounding the working area
    • B23K35/383Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00Articles made by soldering, welding or cutting
    • B23K2101/006Vehicles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00Articles made by soldering, welding or cutting
    • B23K2101/34Coated articles, e.g. plated or painted; Surface treated articles

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Laser Beam Processing (AREA)

Abstract

PURPOSE: A method of welding hot stamping steel sheets is provided to secure tensile strength of a welded portion by pre-treating and removing an Al-Si coating layer through a laser ablation process along a welding line and then performing laser welding. CONSTITUTION: A method of welding hot stamping steel sheets comprises the steps of: aligning the front faces of coating boron steel sheets(P1,P2) and arranging the coating boron steel sheets on a jig(10) with the front faces facing upward(S1), performing a laser ablation process using a laser beam along a welding line on the front face of each coating boron steel sheet held on the jig to remove the coating layer around the front welding line of each coating boron steel sheet(S2), aligning the rear faces of the coating boron steel sheets and arranging the coating boron steel sheets with the rear faces facing upward(S3), performing a laser ablation process using a laser beam along a welding line on the rear faces of the coating boron steel sheets held on the jig to remove the coating layer around a the welding line on the rear faces of the coating boron steel sheets(S4), lowering the thinner coating boron steel sheet relative to the thicker coating boron steel sheet on the jig by the thickness difference so that the front faces of the coating boron steel sheets become flush with each other(S5), and performing butt laser welding irradiating the welding line of the rear face of each coating boron steel sheet with a laser beam(S6).

Description

핫 스탬핑 강판의 접합방법{WELDING METHOD FOR HOT STAMPING COATING STEEL SHEETS} Joining method of hot stamping steel plate {WELDING METHOD FOR HOT STAMPING COATING STEEL SHEETS}

본 발명은 핫 스탬핑 강판의 접합방법에 관한 것으로서, 보다 상세하게는 Al-Si 코팅층을 갖는 핫 스탬핑 강판의 용접부 품질을 확보할 수 있도록 하는 핫 스탬핑 강판의 접합방법에 관한 것이다.The present invention relates to a method for joining a hot stamped steel sheet, and more particularly, to a method for joining a hot stamped steel sheet to ensure weld quality of a hot stamped steel sheet having an Al-Si coating layer.

일반적으로 자동차 메이커에서 최초로 신차 개발 시에는 개발된 차량의 안전도를 검증하기 위하여 다양한 안전성 시험을 하게되는데, 이는 일정한 기준을 마련하고 이 기준에 합당한지 여부에 따라 완성도를 체크하게 된다.In general, when developing a new car for the first time in a car maker, various safety tests are conducted to verify the safety of the developed vehicle. This establishes a certain standard and checks the completeness according to whether the standard is appropriate.

차량에 있어서의 안전성은 특히, 승차자의 생명에 관련하는 바, 차량의 완성도에 가장 많은 영향을 미치는 요소라 할 수 있으며, 세계 여러 나라에서도 이와 같은 차량의 안전도에 가장 엄격한 기준을 적용시키고 있는 실정이다.In particular, safety in a vehicle is the most influential factor in the completeness of the vehicle, as it relates to the life of the rider, and many countries in the world apply the strictest standards to the safety of the vehicle. .

이와 같이 차량 안전도의 중요성이 대두됨에도 불구하고, 종래의 차체 부품은 보편적으로 스틸(Steel)계 강판 소재를 프레스 성형하여 구성되어 차체의 안전성에 영향을 미치는 강성과 연비에 영향을 미치는 경량화를 동시에 만족하기에는 한계가 있었다. Despite the importance of vehicle safety, the conventional body parts are generally formed by press-forming steel-based steel sheets to satisfy the rigidity that affects the safety of the vehicle body and the light weight that affects fuel efficiency. There was a limit.

이에 따라, 최근에는 강성과 경량화를 동시에 만족시킬 수 있는 신 성형공법과 고 강도 초경량 신소재에 대한 연구가 활발하게 진행되고 있다. Accordingly, in recent years, research has been actively conducted on a new molding method and a high strength ultra light new material that can satisfy both rigidity and light weight at the same time.

이러한 연구 개발의 일환으로, 차체 부품에 적용되는 신 성형공법의 사례로는 프레스 성형(press stamping) 공법을 대체한 롤 포밍(roll forming) 공법이 개발되어 초고장력 강판의 성형을 가능하게 함으로써 적용소재의 두께를 낮추어 기존 프레스 성형품 대비 15%이상의 경량화를 가능하게 하였다. As part of this research and development, a new example of a new molding method applied to vehicle body parts has been developed, in which a roll forming method is replaced by a press stamping method, which enables the formation of high tensile steel sheets. By lowering the thickness of the product, it is possible to reduce the weight by more than 15%.

또한, 서로 다른 재질, 두께, 강도 등을 갖는 소재를 맞춤 블랭크를 제조하는 TWB(tailor welded blank)및 TRB(tailor rolled blank) 기술, 및 일체화 성형기술인 액압 성형(hydroforming) 기술 등의 개발이 지속적으로 진행되고 있는 추세이다. In addition, the development of tailor welded blank (TWB) and tail rolled blank (TRB) technology, which manufactures custom blanks for materials having different materials, thicknesses, strengths, and the like, and hydroforming technology, which is an integrated molding technology, continue to be developed. It is a trend that is progressing.

특히, 최근에는, 도 1에서 도시한 바와 같이, 보론 강판(1)을 이용한 열간 프레스 성형 기술인 핫 스탬핑(hot stamping) 기술이 활발하게 연구되고 있다. In particular, in recent years, as shown in FIG. 1, a hot stamping technique, which is a hot press forming technique using the boron steel sheet 1, has been actively studied.

즉, 핫 스탬핑(hot stamping) 기술은 보론 강판(1)을 적정온도(약 900℃)로 가열하여 프레스 금형(3) 내에서 프레스 성형으로 한번에 성형한 후, 급속 냉각하여 고강도 부품(5)을 제조하는 성형기술이다. In other words, the hot stamping technique is to heat the boron steel sheet 1 to an appropriate temperature (about 900 ℃) to form a press once in the press mold (3), and then rapidly cool the high-strength component (5) It is a molding technology to manufacture.

여기에 적용되는 보론 강판(1)은 미량의 보론(boron)이 첨가된 강판으로, 도 2에 도시한 보론 첨가에 따른 효과를 나타낸 등온냉각 변태곡선(TTT: Time Temperature Transformation)에서 알 수 있듯이 보론의 첨가로 마르텐사이트 금속조직의 생성을 지연하는 효과가 있다.The boron steel sheet 1 applied here is a steel plate to which a small amount of boron is added, and as can be seen from an isothermal cooling transformation curve (TTT) showing the effect of adding boron shown in FIG. 2. The addition of has the effect of delaying the formation of martensite metal structure.

즉, 상기 적정온도 조건에서의 오스테나이트 결정입계에서 보론이 원자상태로 편석하여, 오스테나이트 결정입계의 자유에너지를 낮춤으로서 초석 페라이트 핵 생성을 억제시켜 강의 경화능(??칭 시, 마르텐사이트 형성으로 경화되는 강의 능력)을 현저히 개선하게된다.In other words, boron is segregated to the atomic state in the austenite grain boundary at the appropriate temperature conditions, thereby lowering the free energy of the austenite grain boundary, thereby suppressing the formation of cornerstone ferrite nuclei, thereby forming martensite. To the ability of the steel to harden) significantly.

이러한 보론 강판(1)의 물리적 특성을 이용한 핫 스탬핑 성형은 기존의 고강도 강을 이용한 성형법과는 달리 성형 전 500~800MPa 정도의 인장강도를 가지는 페라이트 조직의 보론 강판을 900℃ 이상의 고온에서 오스테나이트화하여 고온 성형한 후, 급속 냉각시킴으로써 1300~1600MPa 정도의 고 인장강도를 갖는 마르텐사이트 조직의 성형품을 얻게 된다. Hot stamping molding using the physical properties of the boron steel sheet 1, unlike the conventional high-strength steel molding method, austenitic ferritic boron steel sheet having a tensile strength of 500 ~ 800MPa before molding at a high temperature of 900 ℃ or more After the high temperature molding, by rapid cooling to obtain a molded article of martensite structure having a high tensile strength of about 1300 ~ 1600MPa.

여기서 얻는 핫 스탬핑 성형품은 일반 강판 부품보다 강도가 4~5배 높으면서도 무게는 기존에 비하여 최대 40%까지 줄일 수 있어 상기한 바와 같은 차체 부품의 경량화와 강도 향상을 동시에 이룰 수 있는 이점이 있다. The hot stamping molded article obtained here is 4 to 5 times higher in strength than the general steel sheet, but the weight can be reduced by up to 40% compared to the conventional, there is an advantage that can achieve the weight reduction and strength improvement of the body parts as described above.

이러한 핫 스탬핑 성형기술의 이점에도 불구하고, 일반적으로 적용되는 핫 스탬핑 강판(일반 보론 강판)은 핫 스탬핑 성형공정을 거치면서 표면에 산화 피막(산화 스케일)을 발생시키는 단점이 있어, 이를 방지하기 위해 보론 강판의 표면에 Al-Si이 코팅 처리된 코팅층을 갖는 코팅 보론 강판을 핫 스탬핑 강판 소재로 개발하여 사용된다.Despite the advantages of this hot stamping molding technology, generally applied hot stamping steel sheet (general boron steel sheet) has the disadvantage of generating an oxide film (oxidation scale) on the surface during the hot stamping molding process, to prevent this A coated boron steel sheet having a coating layer coated with Al-Si on the surface of the boron steel sheet is developed and used as a hot stamping steel sheet material.

한편, 최근에는 이러한 핫 스탬핑 강판의 소재절감 및 경량화에 더욱 적극적으로 대응하기 위해 핫 스탬핑 강판 소재를 맞춤 블랭크로 제조하는 TWB(tailor welded blank) 공법을 병행하여 적용하고 있다. On the other hand, in order to more actively cope with the material reduction and light weight of the hot stamping steel sheet, a TWB (tailor welded blank) method for manufacturing a hot stamping steel sheet material into a blank is applied in parallel.

그러나, 도 3에서 도시한 바와 같이, 상기한 Al-Si 코팅층(C)을 갖는 코팅 보론 강판(P)을 핫 스탬핑 강판 소재로 하여 TWB 공법을 적용할 경우, 용융에 의한 용접부(W) 내부의 대류현상으로 양측 단면상의 Al-Si 코팅층(C)이 용접부(W) 내에 혼입되어 대부분 백색의 금속간 화합물(M)로 존재하게 된다. However, as shown in Figure 3, when the TWB method is applied to the coated boron steel sheet (P) having the Al-Si coating layer (C) as a hot stamping steel sheet material, the inside of the weld portion (W) by melting As a result of convection, Al-Si coating layers (C) on both sides are mixed in the weld portion (W), and mostly exist as a white intermetallic compound (M).

이러한 금속간 화합물(M)은 FeAl3 과 Fe2Al3 로 존재하게 되며, 이로 인해 용접부(W)의 인장 강도가 1100Mpa 이하로 떨어지게 되며, 충격에너지에 의해 용접부 파단이 쉽게 발생하는 문제점이 있다.The intermetallic compound (M) is present as FeAl 3 and Fe 2 Al 3 , due to which the tensile strength of the weld (W) falls below 1100Mpa, there is a problem that the weld break easily occurs by the impact energy.

따라서 본 발명은 상기한 바와 같은 문제점을 해소하기 위하여 발명된 것으로, 본 발명이 해결하려는 과제는 핫 스탬핑 강판에 TWB 공법을 적용하기 위하여 두께가 다른 Al-Si 코팅층을 갖는 2장의 코팅 보론 강판의 맞대기 접합 시, 용접라인을 따라 레이저 어블레이션 공정을 통하여 Al-Si 코팅층을 선처리하여 제거한 후, 레이저 용접을 진행함으로써 용접부 인장강도를 확보할 수 있도록 하는 핫 스탬핑 강판의 접합방법을 제공하는 것이다.Therefore, the present invention has been invented to solve the above problems, the problem to be solved by the present invention is to butt the two coated boron steel sheet having a different Al-Si coating layer in order to apply the TWB method to the hot stamping steel sheet In the bonding, after the Al-Si coating layer is removed by pretreatment of the Al-Si coating layer through a laser ablation process along the welding line, laser welding is performed to provide a method of joining a hot stamped steel sheet to secure weld tensile strength.

상기한 바와 같은 기술적 과제를 실현하기 위한 본 발명에 따른 핫 스탬핑 강판의 접합방법은 코팅층을 가지며 서로 두께가 다른 코팅 보론 강판을 핫 스탬핑 강판 소재로 하여 상호 맞대기 접합하기 위한 핫 스탬핑 강판의 접합방법에 있어서, The method of joining the hot stamped steel sheet according to the present invention for realizing the above technical problem is a method of joining the hot stamped steel sheet for butt-bonding each other by using a coated boron steel sheet having a coating layer and different thickness from each other as a hot stamped steel sheet material. In

상기 각 코팅 보론 강판의 전면을 일치시켜 지그 상에 전면이 위로 배치되도록 맞대어 규제하는 제1단계: 상기 지그 상에 규제된 각 코팅 보론 강판의 전면에 대하여 용접라인을 따라 레이저빔을 통한 레이저 어블레이션 공정을 진행하여 상기 각 코팅 보론 강판의 전면 용접라인 주위의 코팅층을 선행하여 제거하는 제2단계; 상기 각 코팅 보론 강판의 배면을 일치시켜 상기 지그 상에 배면이 위로 배치되도록 맞대어 규제하는 제3단계: 상기 지그 상에 규제된 각 코팅 보론 강판의 배면에 대하여 용접라인을 따라 레이저빔을 통한 레이저 어블레이션 공정을 진행하여 상기 각 코팅 보론 강판의 배면 용접라인 주위의 코팅층을 후행하여 제거하는 제4단계; 상기 제4단계에 이어, 상기 지그 상에서, 각 코팅 보론 강판이 각각의 배면을 위로하여 규제된 상태로, 두께가 두꺼운 코팅 보론 강판에 대하여 두께가 얇은 코팅 보론 강판을 두께차이만큼 아래로 내려 각각의 전면을 일치시키는 제5단계; 상기 제5단계에 이어, 상기 지그 상에 규제된 각 코팅 보론 강판의 배면에 대하여 용접라인을 따라 레이저빔을 조사하여 맞대기 레이저 용접을 진행하는 제6단계를 포함한다. A first step of regulating the front face of each coated boron steel sheet to face each other so that the front surface is placed upward on the jig: laser ablation through a laser beam along a welding line with respect to the front surface of each coated boron steel sheet regulated on the jig Performing a process to remove the coating layer around the front welding line of each coated boron steel sheet in advance; A third step of matching the back surface of each coated boron steel sheet so as to face the top of the coated boron steel plate so as to face the top of the jig; A fourth step of proceeding the removal process by subsequently removing the coating layer around the back welding line of each coated boron steel sheet; Following the fourth step, on the jig, each coated boron steel sheet is regulated with its back face up, and the thin coated boron steel sheet is lowered by a thickness difference with respect to the thick coated boron steel sheet, respectively. A fifth step of matching the front surface; Following the fifth step, a sixth step of performing a butt laser welding by irradiating a laser beam along the welding line to the back surface of each coated boron steel sheet regulated on the jig.

상기 제2단계 및 제4단계의 레이저 어블레이션 공정은 서로 맞대어 규제되는 각 코팅 보론 강판의 용접라인을 따라 코팅층 표면에 레이저 어블레이션 조건에 따른 펄스 레이저를 조사하여 연소시키면서, 일측방에서 노즐을 통하여 어블레이션 가스를 분사하여 연소된 코팅분진을 불어내고, 타측방에서 집진기를 통하여 코팅분진을 집진하도록 진행될 수 있다.The laser ablation process of the second step and the fourth step irradiates and burns the pulsed laser according to the laser ablation conditions on the surface of the coating layer along the welding line of each coated boron steel sheet which is regulated against each other, and through the nozzle from one side. The ablation gas may be sprayed to blow off the burned coating dust, and the coating dust may be collected from the other side through the dust collector.

상기 레이저 어블레이션 조건은 레이저 출력을 1.0KW 이상으로 하고, 레이저 펄스조사시간을 50ns 이하로 하며, 레이저 펄스의 에너지는 100mJ 이상으로 할 수 있다. The laser ablation condition may be a laser output of 1.0KW or more, a laser pulse irradiation time of 50ns or less, and the energy of the laser pulse may be 100mJ or more.

상기 어블레이션 가스는 헬륨 가스로 할 수 있다. The ablation gas may be helium gas.

상술한 바와 같이 본 발명에 따른 핫 스탬핑 강판의 접합방법에 의하면, 두께가 다른 Al-Si 코팅층을 갖는 2장의 코팅 보론 강판의 맞대기 접합을 위한 용접라인을 따라 레이저 어블레이션 공정을 통하여 양면의 Al-Si 코팅층을 선처리하여 제거한 후, 맞대기 레이저 용접을 진행함으로써, 용접부 내부에 Al-Si 코팅층이 혼입되지 않도록 하고, 이로 인해 FeAl3 과 Fe2Al3 등의 금속간 화합물이 용접부 내부에 존재하지 않아 용접부 인장강도를 확보할 수 있다.As described above, according to the method of joining the hot stamped steel sheet according to the present invention, the two-sided Al- is subjected to a laser ablation process along a welding line for butt bonding of two coated boron steel sheets having Al-Si coating layers having different thicknesses. After the Si coating layer is removed by pretreatment, butt welding is performed to prevent the Al-Si coating layer from being mixed in the welded portion, and thus, intermetallic compounds such as FeAl 3 and Fe 2 Al 3 do not exist in the welded portion. Tensile strength can be secured.

도 1은 일반적인 핫 스탬핑 공정의 개념도이다.
도 2는 보론 첨가에 따른 효과를 나타낸 등온냉각 변태곡선(TTT: Time Temperature Transformation)이다.
도 3은 종래 기술의 핫 스탬핑 강판의 접합방법에 따른 Al-Si 코팅층을 갖는 코팅 보론 강판의 용접부 단면도이다.
도 4는 본 발명의 실시예에 따른 핫 스탬핑 강판의 접합방법에 따른 공정도이다.
도 5는 펄스 레이저에 의해 Al-Si 코팅층에 나타나는 레이저 어블레이션 현상의 확대도이다.
도 6은 본 발명의 실시예에 따른 핫 스탬핑 강판의 접합방법에 의한 Al-Si 코팅층을 갖는 코팅 보론 강판의 용접부 단면도이다.
1 is a conceptual diagram of a general hot stamping process.
Figure 2 is an isothermal cooling transformation curve (TTT: Time Temperature Transformation) showing the effect of the addition of boron.
3 is a sectional view of a welded portion of a coated boron steel sheet having an Al—Si coating layer according to a method of joining a hot stamping steel sheet according to the prior art.
4 is a process chart according to the bonding method of the hot stamping steel sheet according to an embodiment of the present invention.
5 is an enlarged view of a laser ablation phenomenon appearing on the Al-Si coating layer by a pulse laser.
6 is a sectional view of a welded portion of a coated boron steel sheet having an Al—Si coating layer by a method of joining a hot stamped steel sheet according to an embodiment of the present invention.

이하, 본 발명의 바람직한 실시예를 첨부한 도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

도 4는 본 발명의 실시예에 따른 핫 스탬핑 강판의 접합방법에 따른 공정도이다.4 is a process chart according to the bonding method of the hot stamping steel sheet according to an embodiment of the present invention.

본 실시예에 따른 핫 스탬핑 강판의 접합방법은 핫 스탬핑 강판의 소재절감 및 경량화에 더욱 적극적으로 대응하기 위해 핫 스탬핑 강판 소재를 맞춤 블랭크로 제조하는 TWB(tailor welded blank) 공법을 병행하여 적용하기 위하여 Al-Si 코팅층(C)을 가지며 두께가 서로 다른 코팅 보론 강판(P1,P2)을 상호 맞대기 접합하기 접합방법이다.Bonding method of the hot stamped steel sheet according to the present embodiment in order to apply in parallel to the TWB (tailor welded blank) method for manufacturing the hot stamped steel sheet material to a custom blank in order to more actively cope with the material reduction and weight reduction of the hot stamping steel sheet It is a joining method for butt bonding the boron steel sheets (P1, P2) having Al-Si coating layer (C) and having different thicknesses.

도 4를 참조하면, 본 실시예에 따른 핫 스탬핑 강판의 접합방법은 각 코팅 보론 강판(P1,P2)의 전면(F1)을 일치시켜 지그(10) 상에 전면(F1)이 위로 배치되도록 맞대어 규제한다.(S1) Referring to FIG. 4, in the bonding method of the hot stamping steel sheet according to the present embodiment, the front surface F1 of each coated boron steel sheet P1 and P2 is matched to face the front surface F1 on the jig 10. Regulate (S1)

이때, 지그(10) 상에서 두께가 서로 다른 각 코팅 보론 강판(P1,P2)의 각 전면(F1)을 위로하여 일치시키기 위해서는 지그(10) 상의 일측방에 액추에이터(A) 구동하는 높이 보정판(11)을 두고, 상기 높이 보정판(11) 상에 두께가 얇은 코팅 보론 강판(P1,P2)을 규제하여 각 코팅 보론 강판(P1,P2) 사이의 두께차이만큼 두께가 얇은 코팅 보론 강판(P2)의 높이를 보정할 수 있도록 한다.At this time, the height correction plate 11 for driving the actuator (A) on one side on the jig 10 in order to match the front surface (F1) of each coated boron steel sheet (P1, P2) of different thickness on the jig 10 upwards. The thickness of the coated boron steel sheet (P2) by the thickness difference between the coated boron steel sheets (P1, P2) by regulating the thin coated boron steel sheets (P1, P2) on the height correction plate (11). Allow height correction.

이러한 상태로, 상기 지그(10) 상에 규제된 각 코팅 보론 강판(P1,P2)의 전면(F1)에 대하여 용접라인을 따라 레이저빔(LB)을 통한 레이저 어블레이션 공정을 진행하여 상기 각 코팅 보론 강판(P1,P2)의 전면(F1) 용접라인 주위의 Al-Si 코팅층(C)을 선행하여 제거한다.(S2)In this state, the laser ablation process is performed through the laser beam LB along the welding line with respect to the front surfaces F1 of the coated boron steel sheets P1 and P2 regulated on the jig 10. The Al-Si coating layer C around the welding line of the front surface F1 of the boron steel sheets P1 and P2 is removed beforehand (S2).

여기서, 레이저 어블레이션 공정은 서로 맞대어 규제되는 각 코팅 보론 강판(P1,P2)의 전면(F1)에 대하여 그 용접라인을 따라 Al-Si 코팅층(C) 표면에 레이저 어블레이션 조건에 따른 펄스 레이저를 조사하여 연소시키면서, 일측방에서 노즐(13)을 통하여 어블레이션 가스를 분사하여 연소된 코팅분진을 불어내고, 타측방에서는 집진기(15)를 통하여 코팅분진을 집진하여 진행된다. Here, the laser ablation process applies a pulsed laser according to the laser ablation conditions on the Al-Si coating layer (C) surface along its welding line with respect to the front surface F1 of each coated boron steel sheet P1 and P2 which are regulated to face each other. While irradiating and burning, one side blows the ablation gas through the nozzle 13 to blow off the burned coating dust, and the other side collects the coating dust through the dust collector 15 and proceeds.

한편, 도 5는 펄스 레이저에 의해 Al-Si 코팅층(C)에 나타나는 레이저 어블레이션 현상의 확대도이다. 5 is an enlarged view of the laser ablation phenomenon which appears in the Al-Si coating layer (C) by a pulse laser.

이때, 상기 레이저 어블레이션 조건은 레이저 출력을 1.0KW 이상으로 하고, 레이저 펄스조사시간을 50ns 이하로 하며, 레이저 펄스의 에너지는 100mJ 이상으로 설정된다. At this time, the laser ablation conditions are set to 1.0KW or more laser output, 50ns or less laser pulse irradiation time, the energy of the laser pulse is set to 100mJ or more.

또한, 상기 어블레이션 가스는 헬륨 가스를 사용할 수 있으나, 이에 한정되는 것은 아니다. In addition, the ablation gas may use helium gas, but is not limited thereto.

이와 같이, 상기 각 코팅 보론 강판(P1,P2)의 전면(F1) 상의 용접라인을 따라 Al-Si 코팅층(C)이 제거된 후에는 각 코팅 보론 강판(P1,P2)의 배면(F2)을 일치시켜 상기 지그(10) 상에 배면(F2)이 위로 배치되도록 뒤집어서 맞대어 규제한다.(S3) As such, after the Al-Si coating layer C is removed along the welding line on the front surface F1 of each of the coated boron steel sheets P1 and P2, the back surface F2 of each of the coated boron steel sheets P1 and P2 is removed. In accordance with this, the back surface F2 is placed upside on the jig 10 so as to be faced with each other and regulated. (S3)

이러한 상태로, 상기 지그(10) 상에 규제된 각 코팅 보론 강판(P1,P2)의 배면(F2)에 대하여 용접라인을 따라 레이저빔(LB)을 통한 레이저 어블레이션 공정을 진행하여 상기 각 코팅 보론 강판(P1,P2)의 배면(F2) 용접라인 주위의 Al-Si 코팅층(C)을 후행하여 제거한다.(S4)In this state, the laser ablation process is performed through the laser beam LB along the welding line with respect to the back surface F2 of the coated boron steel sheets P1 and P2 regulated on the jig 10. The Al-Si coating layer C around the welding line of the back surface F2 of the boron steel sheets P1 and P2 is removed later (S4).

여기서, 상기 각 코팅 보론 강판(P1,P2)의 배면(F2)에 대한 레이저 어블레이션 공정도 상기한 전면(F1)에 대한 레이저 어블레이션 공정과 같이, 서로 맞대어 규제되는 각 코팅 보론 강판(P1,P2)의 배면(F2)에 대하여 그 용접라인을 따라 Al-Si 코팅층(C) 표면에 레이저 어블레이션 조건에 따른 펄스 레이저를 조사하여 연소시키면서, 일측방에서 노즐(13)을 통하여 어블레이션 가스를 분사하여 연소된 코팅분진을 불어내고, 타측방에서는 집진기(15)를 통하여 코팅분진을 집진하여 진행된다. Here, the laser ablation process for the back surface F2 of each of the coated boron steel sheets P1 and P2 may also be regulated against each other, such as the laser ablation process for the front surface F1, respectively. The ablation gas is discharged through the nozzle 13 on one side while irradiating and burning a pulsed laser according to the laser ablation conditions on the Al-Si coating layer (C) surface along the welding line with respect to the back surface F2 of P2). The sprayed coating dust is blown out, and the other side proceeds by collecting the coating dust through the dust collector 15.

또한, 상기 레이저 어블레이션 조건과 상기 어블레이션 가스는 동일하게 적용된다. In addition, the laser ablation conditions and the ablation gas are equally applied.

이와 같이, 상기 각 코팅 보론 강판(P1,P2)의 전면(F1)과 배면(F2)의 용접라인을 따라 Al-Si 코팅층(C)이 제거된 후에는 상기 지그(10) 상에 각 코팅 보론 강판(P1,P2)이 각각의 배면(F2)을 위로하여 규제된 상태로, 두께가 두꺼운 코팅 보론 강판(P1)에 대하여 두께가 얇은 코팅 보론 강판(P2)을 두께차이만큼 아래로 내려 지그(10) 상에 아래로 위치된 각각의 전면(F1)을 일치시킨다.(S5)Thus, after the Al-Si coating layer (C) is removed along the welding lines of the front surface (F1) and the back surface (F2) of each coated boron steel sheet (P1, P2), each coating boron on the jig 10 With the steel sheets P1 and P2 regulated with their respective back surfaces F2 upward, the jig (down) of the thin coated boron steel sheet P2 is lowered by a thickness difference with respect to the thick coated boron steel sheet P1. 10) coincide each of the front surfaces F1 positioned downwards on each other (S5).

즉, 액추에이터(A) 구동하는 높이 보정판(11)을 두께차이만큼 하강하여 두께가 두꺼운 코팅 보론 강판(P1)에 대하여 두께가 얇은 코팅 보론 강판(P2)을 하강시키게 된다. That is, the height correction plate 11 for driving the actuator A is lowered by the thickness difference to lower the coated boron steel sheet P2 having a thin thickness with respect to the thick coated boron steel sheet P1.

이러한 상태로, 상기 지그(10) 상에 배면(F2)을 위로하여 규제된 각 코팅 보론 강판(P1,P2)의 배면(F2)에 대하여 용접라인을 따라 레이저빔(LB)을 조사하여 맞대기 레이저 용접을 진행한다.(S6)In this state, the butt laser is irradiated with the laser beam LB along the welding line with respect to the back surface F2 of each of the coated boron steel sheets P1 and P2 that are regulated with the back surface F2 upward on the jig 10. Proceed with welding (S6).

따라서 상기한 바와 같은 핫 스탬핑 강판의 접합방법에 따라 상호 맞대기 접합된 Al-Si 코팅층(C)을 갖는 2장의 코팅 보론 강판(P1,P2)은 용접라인 주위의 양면에 Al-Si 코팅층(C)이 제거된 상태로 레이저 용접이 진행된다.Therefore, two coated boron steel sheets (P1, P2) having Al-Si coating layers (C) butt-bonded to each other according to the bonding method of the hot stamping steel sheet as described above, Al-Si coating layer (C) on both sides around the welding line Laser welding proceeds in this removed state.

이에, 도 6에서 도시한 바와 같이, 그 용접부(W) 내부에는 Al-Si 코팅층(C)이 혼입되지 않아 FeAl3 과 Fe2Al3 등의 금속간 화합물이 존재하지 않게 되며, 이로 인해 용접부(W)의 인장강도를 확보할 수 있다.Thus, as shown in FIG. 6, the Al-Si coating layer (C) is not mixed in the weld portion (W), such that no intermetallic compounds such as FeAl 3 and Fe 2 Al 3 are present, and thus, the weld portion ( The tensile strength of W) can be secured.

이상과 같이, 본 발명은 한정된 실시 예와 도면을 통하여 설명되었으나, 본 발명은 이에 한정되는 것은 아니며, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에 의해 본 발명의 기술 사상과 아래에 기재된 특허청구범위의 균등범위 내에서 다양한 수정 및 변형이 가능하다.While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Various modifications and variations are possible within the scope of the appended claims.

C: Al-Si 코팅층
P1,P2: 코팅 보론 강판
F1: 전면
F2: 배면
10; 지그
A: 액추에이터
11: 높이 보정판
LB: 레이저빔
13: 노즐
15: 집진기
W: 용접부
C: Al-Si coating layer
P1, P2: coated boron steel plate
F1: front
F2: back
10; Jig
A: Actuator
11: height correction plate
LB: laser beam
13: nozzle
15: dust collector
W: weld

Claims (4)

코팅층을 가지며 서로 두께가 다른 코팅 보론 강판을 핫 스탬핑 강판 소재로 하여 상호 맞대기 접합하기 위한 핫 스탬핑 강판의 접합방법에 있어서,
상기 각 코팅 보론 강판의 전면을 일치시켜 지그 상에 전면이 위로 배치되도록 맞대어 규제하는 제1단계:
상기 지그 상에 규제된 각 코팅 보론 강판의 전면에 대하여 용접라인을 따라 레이저빔을 통한 레이저 어블레이션 공정을 진행하여 상기 각 코팅 보론 강판의 전면 용접라인 주위의 코팅층을 선행하여 제거하는 제2단계;
상기 각 코팅 보론 강판의 배면을 일치시켜 상기 지그 상에 배면이 위로 배치되도록 맞대어 규제하는 제3단계:
상기 지그 상에 규제된 각 코팅 보론 강판의 배면에 대하여 용접라인을 따라 레이저빔을 통한 레이저 어블레이션 공정을 진행하여 상기 각 코팅 보론 강판의 배면 용접라인 주위의 코팅층을 후행하여 제거하는 제4단계;
상기 제4단계에 이어, 상기 지그 상에서, 각 코팅 보론 강판이 각각의 배면을 위로하여 규제된 상태로, 두께가 두꺼운 코팅 보론 강판에 대하여 두께가 얇은 코팅 보론 강판을 두께차이만큼 아래로 내려 각각의 전면을 일치시키는 제5단계;
상기 제5단계에 이어, 상기 지그 상에 규제된 각 코팅 보론 강판의 배면에 대하여 용접라인을 따라 레이저빔을 조사하여 맞대기 레이저 용접을 진행하는 제6단계를 포함하는 핫 스탬핑 강판의 접합방법.
In the joining method of the hot stamping steel sheet for butt-bonding mutually by using a coated boron steel sheet having a coating layer and different thickness from each other as a hot stamping steel sheet material,
A first step of matching the front surface of each coated boron steel sheet to face the front jig to be disposed on a jig;
Performing a laser ablation process through a laser beam along a welding line with respect to the entire surface of each coated boron steel sheet regulated on the jig to remove the coating layer around the front welding line of each coated boron steel sheet in advance;
A third step of matching the back surface of each coated boron steel sheet so as to face the top surface so as to be disposed on the jig;
Performing a laser ablation process through a laser beam along a welding line with respect to the back surface of each coated boron steel sheet regulated on the jig, and subsequently removing the coating layer around the back welding line of each coated boron steel sheet;
Following the fourth step, on the jig, each coated boron steel sheet is regulated with its back face up, and the thin coated boron steel sheet is lowered by a thickness difference with respect to the thick coated boron steel sheet, respectively. A fifth step of matching the front surface;
And a sixth step of performing butt laser welding by irradiating a laser beam along a welding line to the back surface of each coated boron steel sheet regulated on the jig after the fifth step.
제1항에 있어서,
상기 제2단계 및 제4단계의 레이저 어블레이션 공정은
서로 맞대어 규제되는 각 코팅 보론 강판의 용접라인을 따라 코팅층 표면에 레이저 어블레이션 조건에 따른 펄스 레이저를 조사하여 연소시키면서, 일측방에서 노즐을 통하여 어블레이션 가스를 분사하여 연소된 코팅분진을 불어내고, 타측방에서 집진기를 통하여 코팅분진을 집진하도록 진행되는 핫 스탬핑 강판의 접합방법.
The method of claim 1,
The laser ablation process of the second and fourth steps
While irradiating and burning a pulsed laser according to laser ablation conditions on the surface of the coating layer along the welding line of each coated boron steel sheet which is regulated against each other, one side blows the ablation gas through a nozzle to blow off the burned coating dust, Bonding method of the hot stamping steel sheet which is progressed to collect the coating dust through the dust collector in the other side.
제2항에 있어서,
상기 레이저 어블레이션 조건은
레이저 출력을 1.0KW 이상으로 하고, 레이저 펄스조사시간을 50ns 이하로 하며, 레이저 펄스의 에너지는 100mJ 이상으로 하는 핫 스탬핑 강판의 접합방법.
The method of claim 2,
The laser ablation condition is
A method of joining a hot stamped steel sheet, wherein the laser output is 1.0 kW or more, the laser pulse irradiation time is 50 ns or less, and the laser pulse energy is 100 mJ or more.
제2항에 있어서,
상기 어블레이션 가스는
헬륨 가스인 것을 특징으로 하는 핫 스탬핑 강판의 접합방법.
The method of claim 2,
The ablation gas is
A method of joining a hot stamped steel sheet, characterized in that helium gas.
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