KR20120031857A - Junction method of each other different quality of material - Google Patents

Junction method of each other different quality of material Download PDF

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KR20120031857A
KR20120031857A KR1020110009467A KR20110009467A KR20120031857A KR 20120031857 A KR20120031857 A KR 20120031857A KR 1020110009467 A KR1020110009467 A KR 1020110009467A KR 20110009467 A KR20110009467 A KR 20110009467A KR 20120031857 A KR20120031857 A KR 20120031857A
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South Korea
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welding
joining
aluminum
bonding member
bonding
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KR1020110009467A
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Korean (ko)
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이재수
김대근
최원호
서종덕
임창용
남재두
박성진
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주식회사 신영
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Publication of KR20120031857A publication Critical patent/KR20120031857A/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
    • B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
    • B23K35/286—Al as the principal constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
    • B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
    • B23K9/232—Arc welding or cutting taking account of the properties of the materials to be welded of different metals
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/006—Vehicles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Arc Welding In General (AREA)

Abstract

PURPOSE: A junction method for different materials is provided to minimize energy consumption for junction by employing a low-heat input welding method. CONSTITUTION: A junction method for different materials comprises the steps of: manufacturing a first junction member out of a galvanized steel plate, manufacturing a second junction member out of an aluminum material, arranging the first and second junction members with ends thereof overlapped, and welding the first and second junction members through low-heat input welding using argon gas as protective gas.

Description

이종재 접합방법{Junction method of each other different quality of material}Junction method of each other different quality of material}

본 발명은 이종재 접합방법에 관한 것으로, 더욱 상세하게는 스틸과 알루미늄을 저입열 용접을 이용해 접합하는 방법에 관한 것이다. The present invention relates to a dissimilar material joining method, and more particularly, to a method of joining steel and aluminum using low heat input welding.

일반적으로 스틸과 알루미늄과 같은 서로 다른 두 소재를 접합시키는 방법은 대부분 클린칭이나 스크류잉, 리베팅 등과 같은 기계적인 방법을 이용하였다. In general, the joining method of two different materials, such as steel and aluminum, mostly used mechanical methods such as clinching, screwing, and riveting.

그 이유는 열에 의한 접합은 금속간 상이 형성되고, 상기와 같은 금속간의 상은 취성이 높기 때문에 접합부의 물성을 약화시키는 문제가 있기 때문이다.The reason for this is that in the bonding by heat, the intermetallic phase is formed, and the above-described intermetallic phase has a high brittleness, so that there is a problem of weakening the physical properties of the bonding portion.

특히, 자동차 업계에서는 알루미늄과 스틸을 용융 접합할 때 알루미늄이 스틸보다 광흡수율이 낮고, 열전도가 높을 뿐만 아니라 용융 접합 후 변형이나 균열이 잦아 자동차 경량 부품 개발에 한계가 있었다.In particular, in the automotive industry, when aluminum and steel are fusion-bonded, aluminum has a lower light absorption rate than the steel, high thermal conductivity, and deforms or cracks frequently after fusion bonding, thereby limiting the development of lightweight components.

특히, 강판의 경우 강판 표면에 발생하는 산화 피막이 접합을 어렵게 하기 때문에 접합시 발생하는 강판의 산화를 방지할 수 있는 방법을 모색해야 한다. In particular, in the case of steel sheet, since the oxide film generated on the surface of the steel sheet makes it difficult to bond, a method of preventing oxidation of the steel sheet generated at the time of joining should be sought.

한편, 저입열(CMT) 용접은 와이어의 공급제어를 치밀하게 해 용접전류치를 낮추고 모재의 과열을 억제하는 용접 방법으로서, MIG용접에 비해 용접 품질이 좋고 가공으로 인한 변형이 적으며 다른 소재의 접합이 가능하다. On the other hand, low heat input (CMT) welding is a welding method for tightly controlling the supply of wires to reduce the welding current value and suppress overheating of the base metal. This is possible.

본 발명의 과제는 전술한 문제점을 해결하기 위한 것으로, 스틸과 알루미늄과 같은 이질적인 금속 간의 접합을 가능케 하여 자동차 산업 등에서 산업용 부품을 특성을 향상시킬 수 있는 이종재 접합 방법을 제공함에 있다. SUMMARY OF THE INVENTION An object of the present invention is to provide a dissimilar material joining method capable of joining dissimilar metals such as steel and aluminum to improve characteristics of an industrial part in an automobile industry.

상기의 과제를 달성하기 위한 본 발명에 따른 이종재 접합 방법은, 용융아연도금강판(GI)을 이용하여 제1 접합부재를 제조하는 제1 단계와, 알루미늄재질의 제2 접합부재를 제조하는 제2 단계와, 상기 제1 접합부재와 제2 접합부재의 단부가 겹치도록 배치시킨 후, 보호가스로서 아르곤 가스를 사용하여 저입열(CMT) 용접으로 접합하는 접합단계를 포함하는 이종재 접합방법을 제공한다.The dissimilar material joining method according to the present invention for achieving the above object is a first step of manufacturing a first joining member using a hot-dip galvanized steel sheet (GI), and a second joining member made of aluminum It provides a dissimilar material joining method comprising the steps of, and the end of the first joining member and the second joining member to overlap, and joining by low heat input (CMT) welding using argon gas as a protective gas. .

본 발명에 따르면, 스틸과 알루미늄과 같은 이종재의 접합이 가능하게 되어, 자동차 산업 등에서 산업용 부품의 특성을 향상시킬 수 있고, 자동차 차체뿐만 아니라 경량화가 요구되는 고속전철, 조선, 항공기 산업분야 등에도 확대 적용이 가능하며, 저입열 용접방식을 적용하여 접합시 소모되는 에너지량을 최소화할 수 있는 효과가 있다.According to the present invention, it is possible to join dissimilar materials such as steel and aluminum, thereby improving the characteristics of industrial components in the automobile industry, and expanding to high-speed train, shipbuilding, and aircraft industries requiring lightweight as well as automobile bodies. It is possible to apply, it is possible to minimize the amount of energy consumed when joining by applying a low heat input welding method.

또한, 기존에 제시된 이질 금속의 접합방식에 비해 생산 비용 및 시간을 현저히 감소할 수 있고 동일한 재질 금속의 용접과 대비하여 동등한 강도와 내구성이 확보될 수 있는 매우 유용한 효과가 있다.In addition, compared to the conventional method of joining heterogeneous metals, the production cost and time can be significantly reduced, and compared to welding of the same material metal, there is a very useful effect of ensuring the same strength and durability.

도 1은 제1 접합부재와 제2 접합부재의 형상을 나타낸 도면,
도 2는 도 1의 제1 접합부재와 제2 접합부재가 접합된 모습을 보인 도면,
도 3은 제1 접합부재의 도금재질 및 도금유무에 따른 용접결과를 비교한 도면,
도 4 내지 도 5는 제1 접합부재의 도금두께에 따른 용접결과를 비교한 도면,
도 6은 용접 토오치의 용접점의 위치에 따른 용접결과를 비교한 도면.1 is a view showing the shape of the first bonding member and the second bonding member,
2 is a view showing a state in which the first bonding member and the second bonding member of Figure 1 bonded;
3 is a view comparing the welding results according to the plating material and the presence or absence of the first bonding member,
4 to 5 is a view comparing the welding results according to the plating thickness of the first bonding member,
6 is a view comparing the welding results according to the position of the welding point of the welding torch.

이하 첨부된 도면을 참조하여, 바람직한 실시예에 따른 본 발명을 상세히 설명하기로 한다. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

도 1은 제1 접합부재와 제2 접합부재의 형상을 나타낸 도면이고, 도 2는 도 1의 제1 접합부재와 제2 접합부재가 접합된 모습을 보인 도면으로서, 상기한 도 1 내지 도 2에 도시된 바와 같은 본 발명의 이종재 접합 방법은 용융아연도금강판(GI)을 이용하여 제1 접합부재를 제조하는 제1 단계와, 알루미늄재질의 제2 접합부재를 제조하는 제2 단계 및 상기 제1 접합부재와 제2 접합부재의 단부가 겹치도록 배치시킨 후, 보호가스로서 아르곤 가스를 사용하여 저입열(CMT) 용접으로 접합하는 접합단계를 포함하여 구성된다.1 is a view showing the shape of the first joining member and the second joining member, Figure 2 is a view showing a state in which the first joining member and the second joining member of Figure 1 bonded to, Figures 1 to 2 The dissimilar material joining method of the present invention as shown is a first step of manufacturing a first joining member using a hot-dip galvanized steel sheet (GI), a second step of manufacturing a second joining member of aluminum material and the first And a joining step of arranging the end portions of the joining member and the second joining member so as to overlap each other, and then joining by low heat input (CMT) welding using argon gas as a protective gas.

먼저, 제1 단계는 용융아연도금강판(GI)을 이용하여 제1 접합부재를 제조하는 단계로서, 상기 용융아연도금강판(GI)은 냉간압연강판(Cold Rolled Carbon Steel Sheet, CR)을 연속용융 도금라인에서 열처리하여 소정의 재질을 확보한 후 아연을 용융도금한 것이다.First, a first step is a step of manufacturing a first joining member by using a hot-dip galvanized steel sheet (GI), the hot-dip galvanized steel sheet (GI) is a continuous molten cold rolled carbon steel sheet (CR) After the heat treatment in the plating line to secure a predetermined material is zinc plated.

일반적으로 강판의 경우 용접을 통합 접합을 시도하였을 때, 강판 표면에 발생하는 산화 피막이 강판의 접합을 어렵게 하기 때문에 접합시 발생하는 강판의 산화를 방지하기 위해 상기와 같이 강판의 표면에 아연도금을 실시한다.In general, in the case of steel sheets, when the integrated welding is attempted, zinc plating is applied to the surface of the steel sheet as described above to prevent oxidation of the steel sheet generated at the time of joining because the oxide film generated on the surface of the steel sheet makes it difficult to join the steel sheets. do.

상기와 같은 용융아연도금강판을 이용해서 제1 접합부재를 제조하는 공정은 다양한 가공방법이 적용될 수 있다. 특히, 프레스 가공, 드로잉(Drawing) 가공, 피어싱(Piercing) 가공, 트리밍(Trimming) 가공, 레이저 커팅과 같은 가공방법을 통해 제1 접합부재를 제작할 수 있다. The manufacturing process of the first joining member using the hot dip galvanized steel sheet as described above may be applied to various processing methods. In particular, the first bonding member may be manufactured through processing methods such as press working, drawing processing, piercing processing, trimming processing, and laser cutting.

도 3은 제1 접합부재의 도금재질 및 도금유무에 따른 용접결과를 비교한 도면으로서, 각각 합금화용융아연도금강판(GA), 용융아연도금강판(GI), 아연이 도금되지 않은 스틸(CR)과 알루미늄을 겹친 상태에서 보호가스로 100% 아르곤(Ar)을 사용하여 저입열(CMT) 용접을 시행하여 용접상태를 비교하였다. 3 is a view comparing welding results according to the plating material and the presence or absence of plating of the first joining member, respectively, alloyed hot dip galvanized steel (GA), hot dip galvanized steel (GI), and zinc not plated steel (CR). The welding conditions were compared by performing low heat input (CMT) welding using 100% argon (Ar) as a protective gas in the state where aluminum and aluminum were overlapped.

이때, 용접와이어는 AlSi3Mn 1.2mm를 사용하고, 팁과 모재간 거리는 14mm이며, 토오치 각도는 10°로 전진법을 사용했다. 용접속도는 60~150cm/min, 용접전류는 55~127A로 저입열(CMT) 용접을 시행하였다.At this time, the welding wire is AlSi3Mn 1.2mm, the distance between the tip and the base material is 14mm, the torch angle is 10 ° to use the forward method. Welding speed was 60 ~ 150cm / min and welding current was 55 ~ 127A. Low heat input (CMT) welding was performed.

그 결과, 합금화용융아연도금강판(GA)과 아연이 도금되지 않은 스틸(CR)은 용융아연도금강판(GI)에 비해 매우 불안정한 용접성의 보여 저입열(CMT) 용접이 적합하지 않다는 결과를 얻을 수 있었다.As a result, alloyed hot-dip galvanized steel (GA) and non-galvanized steel (CR) exhibited very unstable weldability compared to hot-dip galvanized steel (GI), resulting in low heat input (CMT) welding. there was.

제2 단계는 알루미늄재질의 제2 접합부재를 제조하는 단계로서, 상기 제1 접합부재와 마찬가지로 알루미늄판에 프레스 가공, 드로잉(Drawing) 가공과 같은 다양한 가공방법을 적용하여 제2 접합부재를 제조한다.The second step is to manufacture a second joining member made of aluminum, similarly to the first joining member, a second joining member is manufactured by applying various processing methods such as press working and drawing processing to the aluminum plate. .

제 3단계는 상기 제1 접합부재와 제2 접합부재의 단부가 겹치도록 배치시킨 후, 보호가스로서 아르곤 가스를 사용하여 저입열(CMT) 용접으로 접합하는 단계이다. 여기서 상기 접합 단계는 스폿(Spot), 리니어(Linear)를 비롯한 다양한 용접 방식이 적용될 수 있다.The third step is a step of arranging the ends of the first joining member and the second joining member to overlap, and then joining by low heat input (CMT) welding using argon gas as a protective gas. Here, the bonding step may be applied to a variety of welding methods, including spot (Spot), linear (Linear).

일반적으로 재질의 특성상 알루미늄은 박판의 형태로 각 분야에 적용되고 있으며, 상기와 같은 알루미늄을 접합하는 방법은 MIG 용접, TIG 용접 및 레이저 용접이 주를 이룬다. 그러나 박판 형태의 알루미늄에 용접을 시행할 경우, 비열과 열 전도도가 크기 때문에 고온의 열원이 필요하고, 열변형이 매우 크며, 균열이 생기기 쉽고, 융착 금속에 기공이 발생하는 등의 다양한 문제점이 발생한다. In general, aluminum is applied to each field in the form of a thin plate, and the method of joining the aluminum is mainly made of MIG welding, TIG welding, and laser welding. However, when welding the thin plate-shaped aluminum, there are various problems such as high heat source, high heat deformation, very large cracking, and pores in the fused metal due to the high specific heat and thermal conductivity. do.

따라서, 상기와 같은 알루미늄의 용접에서 발생되는 문제점을 해결하기 위해 저입열(CMT, Cold Metal Transfer)용접을 실시한다.Therefore, low heat input (CMT, Cold Metal Transfer) welding is performed to solve the problems caused by the welding of aluminum as described above.

저입열(CMT) 용접은 주변부의 열영향부가 좁은 특징과 함께, 저입열(CMT) 용접은 기존의 MIG 용접방법에 비해 상대적으로 낮은 온도에서 금속이행이 이루어진다.Low heat input (CMT) welding has a narrow heat affected area, and low heat input (CMT) welding is performed at a relatively low temperature compared to the conventional MIG welding method.

기존의 MIG 용접방식은 단락단계에서 전류가 증가하였지만, 저입열(CMT) 용접방식은 단락단계에서 와이어가 역인(retraction)되고, 전류가 낮게 유지된다. 이에 따른 용적이행 결과는 용적의 표면장력을 높여주거 저전류에서도 안정적인 아크유지 가능하고, 스패터가 거의 나타나지 않아 박판의 알루미늄의 용접에도 적합한 접합방법으로 채택가능하다.
In the conventional MIG welding method, the current increases in the short circuit stage, but in the low heat input (CMT) welding method, the wire is retracted in the short circuit stage and the current is kept low. As a result of this, the volumetric performance is increased, and it is possible to maintain a stable arc even at low current and increase the surface tension of the volume. Since spatter hardly appears, it can be adopted as a suitable bonding method for welding of thin aluminum.

도 4 내지 도 5는 제1 접합부재의 도금두께에 따른 용접결과를 비교한 도면으로서, 상기한 도면에 도시된 것과 같은 본 발명의 바람직한 실시 예에 따르면, 상기 제1 접합부재는 스틸 표면에 7 ~ 35㎛의 아연이 도금된 것을 특징으로 한다.4 to 5 is a view comparing the welding results according to the plating thickness of the first joining member, in accordance with a preferred embodiment of the present invention as shown in the above drawings, the first joining member 7 to the surface of the steel 35 μm of zinc is plated.

먼저, 도 4에 도시된 바와 같이 7㎛의 두께로 아연도금된 용융아연도금강판(GI) 시편과 알루미늄 시편에 겹치기 방식으로 저입열(CMT) 용접을 실시하였다.이때, 제1 접합부재는 1.2t의 용융아연도금강판(GI), 제2 접합부재는 2.0t의 알루미늄이고, 전류(와이어 공급속도)는 79A이고, 용접속도는 0.75 m/min, 토오치의 기울기는 25°로 저입열(CMT) 용접을 시행하였다.First, as shown in FIG. 4, low heat input (CMT) welding was performed by overlapping a galvanized hot-dip galvanized steel (GI) specimen and an aluminum specimen to a thickness of 7 μm. Hot-dip galvanized steel sheet (GI), the second joining member is 2.0t of aluminum, current (wire feed rate) is 79A, welding speed is 0.75 m / min, torch slope is 25 ° low heat input (CMT) Welding was performed.

그 결과, 7㎛의 두께로 도금된 용융아연도금강판(GI)과 알루미늄은 저입열(CMT) 용접을 통해 접합 가능함을 확인할 수 있었다.As a result, it was confirmed that the hot-dip galvanized steel (GI) and aluminum plated to a thickness of 7 ㎛ can be bonded through low heat input (CMT) welding.

한편, 도 5에 도시된 바와 같이 도금 두께가 각각 11.3㎛, 14.8㎛, 21.6㎛, 30.3㎛, 35.4㎛인 용융아연도금강판(GI) 시편를 알루미늄 시편에 겹치기 방식으로 저입열(CMT) 용접을 실시하였다.Meanwhile, as shown in FIG. 5, low-heat-heat (CMT) welding is performed by overlapping a hot-dip galvanized steel (GI) specimen having a plating thickness of 11.3 μm, 14.8 μm, 21.6 μm, 30.3 μm, or 35.4 μm with an aluminum specimen, respectively. It was.

그 결과, 도금 두께에 따라 차이가 있지만 양호한 용접성을 보였으며, 각 용접부의 단면에 기공이 존재했다. 상기와 같이 용접부에 기공이 발생된 이유는 알루미늄 용접 시 발생하는 기공뿐만 아니라, 용융아연도금강판(GI)의 아연 기화에 따른 결과이기도 하다. As a result, although there was a difference depending on the plating thickness, good weldability was shown, and pores existed in the cross section of each weld portion. The reason why the pores are generated in the weld as described above is not only the pores generated during the aluminum welding, but also the result of zinc vaporization of the hot-dip galvanized steel sheet (GI).

일반적으로 표면이 아닌 겹침 경계에 발생된 기공은 인장강도 시험시, 용접부의 파단 가능성을 높인다. 상기 다양한 도금두께를 갖는 용융아연도금강판(GI) 시편의 용접부 단면을 확인한 결과, 35.4㎛의 도금두께를 갖는 용융아연도금강판(GI)의 겹침 경계에 가장 많은 기공이 발생되었다. 따라서 상기 제1 접합부재의 소재인 용융아연도금강판(GI) 아연도금 두께는 7 ~ 35㎛로 한정한다.In general, pores generated on the overlapping boundary, not on the surface, increase the likelihood of fracture in the weld during tensile strength testing. As a result of confirming the weld section of the hot dip galvanized steel (GI) specimen having various plating thicknesses, the most pores were generated at the overlapping boundary of the hot dip galvanized steel sheet (GI) having a plating thickness of 35.4 μm. Therefore, the hot dip galvanized steel (GI) galvanizing thickness of the first bonding member is limited to 7 ~ 35㎛.

본 발명의 바람직한 실시 예에 따르면, 상기 제2 접합부재는 상기 제1 접합부재의 상부에 위치된다.According to a preferred embodiment of the present invention, the second bonding member is located above the first bonding member.

상기와 같이 알루미늄이 상단에 위치해야 하는 이유를 설명하면 다음과 같다. 일반적으로, 알루미늄과 스틸의 용융용접의 경우 FexAlx형태의 IMC(금속간화합물) 생성으로 용융용접이 어렵다. 이러한 한계에 대응하기 위하여 스틸모재 표면에 알루미늄을 브레이징형태로 접합시켜야만 한다. 이때 스틸표면은 알루미늄과 친화성이 있는 성분(Zn, Al, Ag 등)으로 도금되어 있어야 하는데, 이는 스틸에서 Fe원소 발생을 최소화 하여 금속간화합물층을 최소화하기 위함이다. 상기 알루미늄-스틸간의 Weld-braze형태의 용접에 사용되는 필러와이어(용가재, 용접봉)는 4000계열 알루미늄을 사용하였는데, 특히 Fronius社 의 Special wire로 가능하나 4047 wire로도 가능함을 확인할 수 있었다. When explaining why the aluminum should be located at the top as described above is as follows. In general, in the case of melt welding of aluminum and steel, melt welding is difficult due to IMC (intermetallic compound) generation in the form of Fe x Al x . To meet this limitation, aluminum must be brazed to the surface of the steel substrate. At this time, the steel surface should be plated with affinity with aluminum (Zn, Al, Ag, etc.), in order to minimize the intermetallic compound layer by minimizing the generation of Fe elements in the steel. The filler wire (a filler material, a welding rod) used in the weld-braze welding between aluminum and steel used 4000 series aluminum, in particular, it was possible to use a special wire made by Fronius, but it was also possible to use a 4047 wire.

알루미늄 필러와이어와 알루미늄 모재간의 용융이 스틸계면부에 브레이징형태로 스며들어 접합되나 스틸이 상판에 위치하였을 경우 스틸모재에서 Fe원소 발생으로 IMC층이 발생하였으며, 상기 IMC가 10um이상의 층이 생성된 경우 접합이 되지 않았다. 한편, 하판에 알루미늄을 두고 필러와이어를 하판에서 조사하여 상판으로 용융금속을 이동하는 방법도 실험하였으나, 중력의 작용으로 용융풀이 상판으로 이동이 어려웠으며, 스틸-알루미늄 계면부에도 잘 스며들지 않아 접합이 매우 불량하였다.When the aluminum filler wire and the aluminum base metal are brazed into the steel interface and bonded to each other, but the steel is placed on the upper plate, the IMC layer is generated due to the occurrence of Fe element in the steel base material. There was no bonding. On the other hand, the method of moving the molten metal to the upper plate by irradiating the filler wire from the lower plate with aluminum on the lower plate was also experimented, but it was difficult for the molten pool to move to the upper plate due to the action of gravity, and it did not penetrate into the steel-aluminium interface, so it was joined. This was very bad.

도 6은 용접 토오치의 용접점의 위치에 따른 용접결과를 비교한 도면으로서, 상기 도 6에 도시된 바와 같은 본 발명의 바람직한 실시 예에 따르면, 상기 접합단계는 용접 토오치가 상기 제1 접합부재의 선단부를 향하도록 배치된 상태에서 용접을 시행한다. 6 is a view comparing welding results according to positions of welding points of a welding torch. According to a preferred embodiment of the present invention as shown in FIG. 6, the joining step includes a welding torch connected to the first joining. Welding is to be carried out with the members arranged so as to face the leading end of the member.

먼저, 첫 번째(a)의 경우 용접 토오치를 알루미늄의 선단부에서 1mm 이격된 위치를 용접점으로 저입열(CMT) 용접을 실시한 결과이고, 두 번째(b)의 경우는 용접 토오치를 알루미늄의 선단부를 용접점으로 저입열(CMT) 용접을 실시한 결과이다. 세 번째(c)의 경우 용접 토오치를 알루미늄과 용융아연도금강판(GI)의 경계를 용접점으로 저입열(CMT) 용접을 실시한 결과이고, 네 번째(d)의 경우는 용접 토오치를 알루미늄과 용융아연도금강판(GI)의 경계에서 용융아연도금강판(GI)방향으로 1mm 이격된 위치를 접점으로 저입열(CMT) 용접을 실시한 결과이다.First, in the case of the first (a), the welding torch is the result of the low heat input (CMT) welding at the welding point at a position spaced 1 mm from the tip of the aluminum. It is the result of performing low heat input (CMT) welding with the tip part as a welding point. In the third case (c), the welding torch is the result of low heat input (CMT) welding using the boundary between the aluminum and the hot-dip galvanized steel sheet (GI) as the welding point. In the fourth case (d), the welding torch is made of aluminum. This is the result of the low heat input (CMT) welding with the contact point 1mm away from the boundary of the hot-dip galvanized steel sheet (GI) in the direction of the hot-dip galvanized steel sheet (GI).

그 결과, 두 번째(b)의 경우, 즉 용접 토오치를 알루미늄의 선단부를 용접점으로 저입열(CMT) 용접을 시행했을 때 가장 좋은 용접결과가 나왔다.As a result, in the second case (b), that is, when welding torch was subjected to low heat input (CMT) welding at the tip of aluminum, the best welding result was obtained.

본 발명의 바람직한 실시 예에 따르면, 상기 제1 접합부재는 자동차용 팩키지트레이(Package Tray)이고, 상기 제2 접합부재는 자동차용 파티션 패널(Partition Panel)이다.According to a preferred embodiment of the present invention, the first bonding member is an automobile package tray, and the second bonding member is an automobile partition panel.

즉, 용융아연도금강판(GI)으로 제1 접합 부재인 자동차용 팩키지트레이(Package Tray)를 제조하고, 알루미으로 제2 접합 부재인 자동차용 파티션 패널(Partition Panel)을 제조한다. That is, an automotive package tray which is a first bonding member is manufactured from hot dip galvanized steel sheet GI, and a partition panel for automobiles, which is a second bonding member, is manufactured from alumina.

그 후, 알루미늄 재질의 자동차용 파티션 패널(Partition Panel)을 용융아연도금강판(GI) 재질의 자동차용 팩키지트레이(Package Tray)의 상부에 위치시킨 후, 보호 가스로서 아르곤 가스를 100% 사용하여 저입열(CMT) 용접으로 접합한다. 이때, 접합 형상은 스팟 또는 리니어 형상 등일 수 있다. After that, an aluminum partition panel for automobiles is placed on top of an automotive package tray made of hot dip galvanized steel (GI), and then 100% of argon gas is used as a protective gas. Joining is done by heat input (CMT) welding. In this case, the bonding shape may be a spot or linear shape.

본 발명은 첨부된 도면에 도시된 일 실시예를 참고로 설명되었으나 이는 예시적인 것에 불과하며, 당해 기술분야에서 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 타 실시예가 가능하다는 점을 이해할 수 있을 것이다. 따라서, 본 발명의 진정한 보호 범위는 첨부된 청구 범위에 의해서만 정해져야 할 것이이하 첨부된 도면을 참조하여, 바람직한 실시예에 따른 본 발명을 상세히 설명하기로 한다. Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be. Accordingly, the true scope of protection of the present invention should be defined only by the appended claims. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Claims (5)

용융아연도금강판(GI)을 이용하여 제1 접합부재를 제조하는 제1 단계;
알루미늄재질의 제2 접합부재를 제조하는 제2 단계;
상기 제1 접합부재와 제2 접합부재의 단부가 겹치도록 배치시킨 후, 보호가스로서 아르곤 가스를 사용하여 저입열(CMT) 용접으로 접합하는 접합단계;를 포함하는 것을 특징으로 하는 이종재 접합방법.A first step of manufacturing a first bonding member using a hot-dip galvanized steel sheet (GI);
A second step of manufacturing a second bonding member made of aluminum;
And disposing end portions of the first bonding member and the second bonding member so as to overlap each other, and then joining them by low heat input (CMT) welding using argon gas as a protective gas. 제 1항에 있어서, 상기 제1 접합부재는
스틸 표면에 7 ~ 35㎛의 아연이 도금된 것을 특징으로 하는 이종재 접합방법.The method of claim 1, wherein the first bonding member
Dissimilar materials bonding method characterized in that the zinc plated on the surface of 7 ~ 35㎛. 제 1항에 있어서, 상기 제2 접합부재는
상기 제1 접합부재의 상부에 위치되는 것을 특징으로 하는 이종재 접합방법.The method of claim 1, wherein the second bonding member
The dissimilar material joining method, characterized in that located on top of the first joining member. 제 3항에 있어서, 상기 접합단계는
용접 토오치가 상기 제1접합부재의 선단부를 향하도록 배치된 상태에서 용접을 시행하는 것을 특징으로 하는 이종재 접합방법.The method of claim 3, wherein the bonding step
The welding method for dissimilar materials, characterized in that welding is performed in a state where the welding torch is disposed to face the distal end portion of the first joining member. 제 1항에 있어서,
상기 제1 접합부재는 자동차용 팩키지트레이(Package Tray)이고, 상기 제2 접합부재는 자동차용 파티션 패널(Partition Panel)인 것을 특징으로 하는 이종재 접합방법.The method of claim 1,
The first bonding member is a vehicle package tray (Package Tray), the second bonding member is a dissimilar material joining method, characterized in that the partition panel (Partition Panel) for the vehicle.
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CN103706958A (en) * 2013-12-26 2014-04-09 中国铝业股份有限公司 Aluminum steel interface reductant
EP2808117A1 (en) * 2013-05-28 2014-12-03 MAGNA STEYR Engineering AG & Co KG Method for manufacturing a welded connection between a high strengh aluminium part containing copper and another part using the CMT welding process
WO2015166149A1 (en) * 2014-04-30 2015-11-05 Peugeot Citroen Automobiles Sa Method of assembly by discontinuous thermal welding along the join of a steel sheet with an aluminium sheet, with deposition of a clean material to form a sealed joint on the join
KR101867588B1 (en) * 2016-10-28 2018-06-15 주식회사 신영 Hybrid combination structure of the partition panel
KR20180117528A (en) * 2017-04-19 2018-10-29 한온시스템 주식회사 Method for connecting components by welding
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* Cited by examiner, † Cited by third party
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EP2808117A1 (en) * 2013-05-28 2014-12-03 MAGNA STEYR Engineering AG & Co KG Method for manufacturing a welded connection between a high strengh aluminium part containing copper and another part using the CMT welding process
US9545685B2 (en) 2013-05-28 2017-01-17 MAGNA STEYR Engineering AG & Co KG Method for producing a welded joint
CN103706958A (en) * 2013-12-26 2014-04-09 中国铝业股份有限公司 Aluminum steel interface reductant
CN103706958B (en) * 2013-12-26 2016-05-25 中国铝业股份有限公司 The agent of aluminum steel Interface Reduction
WO2015166149A1 (en) * 2014-04-30 2015-11-05 Peugeot Citroen Automobiles Sa Method of assembly by discontinuous thermal welding along the join of a steel sheet with an aluminium sheet, with deposition of a clean material to form a sealed joint on the join
FR3020583A1 (en) * 2014-04-30 2015-11-06 Peugeot Citroen Automobiles Sa METHOD FOR ASSEMBLING SHEETS IN DIFFERENT MATERIALS
CN106470788A (en) * 2014-04-30 2017-03-01 标致雪铁龙集团 The assemble method of the thermal weld being interrupted by the interface along steel sheet metal component and aluminum sheet metal component using the deposition being suitable to the material that sealed interface is formed on interface
KR101867588B1 (en) * 2016-10-28 2018-06-15 주식회사 신영 Hybrid combination structure of the partition panel
KR20180117528A (en) * 2017-04-19 2018-10-29 한온시스템 주식회사 Method for connecting components by welding
KR102047971B1 (en) * 2018-06-22 2019-11-22 주식회사 현성오토텍 Cold metal transfer welding apparatus for lightweight of body-frame and welding method using the same

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