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

摘要： 文章围绕 2020 年至今铝合金与钢板连接技术的最新进展进行综述。面对轻量化趋势以 及材料性能不匹配的挑战，研究集中于传统焊接工艺的优化与混合连接技术的推广应用。激 光-电弧复合焊通过精准调控热输入，有效控制金属间化合物（IMC）层厚度，提升接头力学 性能；冷金属过渡（CMT）技术通过其特有的低热输入特性，可实现薄板的高效金属惰性气 体保护（MIG）钎焊连接；混合摩擦搅拌焊结合预热技术降低工具负载，改善焊接质量。未 来重点在新合金开发、人工智能工艺参数优化及可持续制造策略，推动轻量化连接技术在新 能源汽车领域实现应用规模化。

关键词: 钢铝混合车身；连接技术；IMC；LAHW