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Laser roll welding of dissimilar metal joint of zinc coated steel to aluminum alloy

机译:镀锌钢的异种金属接头与铝合金的激光辊焊

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摘要

There is a subject to reduce the weight of car body by replacing steel to aluminum alloys as some structural body parts for improving fuel consumption and suppressing CO_2 generation. As one of the solutions, the hybrid body structure concept using aluminum alloys and high strength steels is proposed recently. However, it is well known that fusion welding of steel and aluminum is difficult due to the formation of brittle intermetallic compounds at the joint interface. Therefore, new welding processes by which these dissimilar materials can be joined in high reliability and productivity are demanded. "Laser roll welding" has been developed for joining of dissimilar metals by Kutsuna, Rathod, and Tsuboi in 2002 (Japanese Patent No. 3535152 and No. 3692135). Controlling the formation of the brittle imtermetallic compounds was tried by application of laser roll welding to get a sound joint. In the present work, laser roll welding of zinc coated steel and aluminum alloy was fundamentally investigated, and the process parameters were studied. Furthermore, the influences of process parameters on the weldability, the formation of intermetallic compound layer, and the joint properties have been investigated to get a sound joint. When intermetallic compound layer thickness was less than 10 μm, failure of tensile shear test specimen occurred in the base metal of the zinc coated steel.
机译:通过将钢代替铝合金作为某些结构体部件来减轻车身的重量,以改善燃料消耗并抑制CO 2的产生。作为解决方案之一,最近提出了使用铝合金和高强度钢的混合车身结构的概念。但是,众所周知,由于在接合界面处形成脆性的金属间化合物,因此难以进行钢和铝的熔焊。因此,需要新的焊接工艺,通过这些焊接工艺可以高可靠性和高生产率地接合这些异种材料。 Kutsuna,Rathod和Tsuboi于2002年开发了“激光辊焊”来连接异种金属(日本专利3535152和3692135)。尝试通过应用激光辊焊来控制脆性金属间化合物的形成,以获得良好的接头。在目前的工作中,从根本上研究了镀锌钢板和铝合金的激光辊焊,并研究了工艺参数。此外,研究了工艺参数对可焊性,金属间化合物层的形成以及接头性能的影响,以获得良好的接头。当金属间化合物层的厚度小于10μm时,在镀锌钢的母材中发生拉伸剪切试验片的破坏。

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