关键词: 钢铝混合车身；连接技术；IMC；LAHW

Abstract: This article reviews the recent advancements in aluminum alloy-to-steel joining technologies from 2020 year to the present. In response to the trends of lightweighting and the challenges posed by material property mismatch, research focuses on the optimization of traditional welding processes and the promotion of hybrid joining techniques. Laser-arc hybrid welding effectively controls the thickness of the intermetallic compound (IMC) layer through precise heat input regulation, thereby enhancing the mechanical properties of the joint. The cold metal transfer (CMT) technique enables high-efficiency metal inert gas (MIG) brazing of thin sheets by leveraging its characteristic low heat input. Hybrid friction stir welding, when combined with preheating technology, reduces tool load and improves weld quality. Future efforts prioritize the development of new alloys, artificial intelligence-based optimization of process parameters, and sustainable manufacturing strategies, aiming to scale up the application of these lightweight joining technologies in the field of new energy vehicles.

Key words: steel-aluminum hybrid car bodies; joining technology; IMC; LAHW