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Study on Key Joining Technology and Test Method of Steel/al Hybrid Structure Body-in-White

Journal of Materials Science and Chemical Engineering 2024年第4期12卷 104-118页

作者： Lijun Han Fuyang Liu Changhua Liu Planning Technology Center FAW-Volkswagen Automotive Co. Ltd. Changchun China

Green and low carbon promote the application and development of light-weight materials in body-in-white. Large-scale die-casting al alloy (DCAA) and high-strength thermo-formed steel sheet (TFSS) have put forward higher requirements for the application of joining technology of high-strength steel/al dissimilar materials. Taking the new die-casting al alloy body as an example, this paper systematically studies the progress of the latest joining methods of steel/al dissimilar material with combination of two-layer plate and three-layer plate. By analyzing the joining technologies such as FSPR, RES, FDS and SPR, the technology and process characteristics of steel/al dissimilar material joining are studied, and the joining technical feasibility and realization means of different material combination of the body are analyzed. The conditions of material combination, material thickness, material strength, flange height, preformed holes and joint spacing for achieving high-quality joining are given. The FSPR joining technology is developed and tested in order to meet with the joining of parts with DCAA and TFSS, especially for the joining of three-layer plates with them. It finds the method and technical basis for the realization of high quality joining of dissimilar materials, provides the early conditions for the application of large DCAA and TFSS parts in body-in-white, and meets the design requirements of new energy body. .

关键词： Body-in-White Lightweight die-casting al alloy Thermo-Formed Steel Joining

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