基于环形聚流效应的铝/钢电阻点焊界面反应及金属间化合物生长机制

项目名称： 基于环形聚流效应的铝/钢电阻点焊界面反应及金属间化合物生长机制

项目编号： No.U1204520

项目类型： 联合基金项目

立项/批准年度： 2013

项目学科： 机械工程学科

项目作者： 邱然锋

作者单位： 河南科技大学

项目金额： 30万元

中文摘要： 随着环保、能源问题的日益突出，汽车车身轻量化已成为汽车工业发展的必然选择，而“钢+铝”复合结构车身有望随之成为轻质汽车的主流结构。因此，开展铝/钢异种金属可靠连接技术及相关机理的研究日趋迫切。本项目以界面金属间化合物生长机制为研究对象，以控制温度场为线索，利用研制的嵌入式复合电极点焊铝/钢异种金属，使焊接区电流在点焊过程中发生环形聚集而凹化温度场。在探明焊接区温度场与环形聚流间内在关系的基础上，探索Al、Fe等元素间界面反应行为及金属间化合物的演变规律，分析环形聚流效应对界面的金属间化合物层的结构、形貌、厚度及分布等特征参量的影响，进而阐明界面金属间化合物的生长机制，以期从电极结构、工艺参量的设计出发提出有效控制界面金属间化合物生长进而提高接头性能的策略。本项目预期研究成果能为热物性悬殊的异种金属电阻点焊工艺设计提供理论依据，为“钢+铝”复合结构轻质车身的工程化应用提供技术支撑。

中文关键词： 铝合金；钢；电阻点焊；复合电极；金属间化合物

英文摘要： In automotive industry, reducing the weight of automobile body is inevitable as protecting environment and energy saving get more serious. Against the background, aluminum-steel hybrid structural automobile body is an expected structure for the weight reduction. Hence it is necessary and urgent to study reliable technology and related mechanism for the joining of aluminum/steel. With interfacial intermetallic compounds growth mechanism as the research object, controlling temperature field as clues in this project, composite and embedded electrodes will be used to weld aluminum alloy and steel in order to make welding zone current gather in ring shape, thereby the temperature field is concaved during resistance spot welding. On the basis of clarifying the essential relationship between welding zone temperature field and ring-gathered current, intermetallic compounds evolution rule and reaction behavior of Al and Fe atoms at the welding interface will be explored. The influence of ring-gathered current on the structure, morphology, thickness and distribution of the intermetallic compound will be detailedly analysed. Based on these investigations, the growth mechanism of intermetallic compounds at the welding interface will be illustrated. From the design of electrode structure and welding parameters, an effective

英文关键词： Aluminum alloy；Steel；Resistance spot welding；Compound electrodes；Intermetallic compound