镁-钢无匙孔搅拌摩擦点焊关键技术及接头结合机理研究

项目名称： 镁-钢无匙孔搅拌摩擦点焊关键技术及接头结合机理研究

项目编号： No.51265030

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 机械、仪表工业

项目作者： 王希靖

作者单位： 兰州理工大学

项目金额： 50万元

中文摘要： 随着汽车、航空航天等行业高速发展的需要，异种金属镁与钢的焊接已成为国内外共同关注并且急需解决的问题，由于镁与钢不互溶且各自物理性能的过大差异，常规熔化焊方法难以实现它们的牢固连接。鉴于搅拌摩擦焊是在被连接材料的固态下完成，本课题组拟自行设计无匙孔搅拌摩擦点焊装置实现AZ31B镁合金与DP600镀锌钢板的优质搭接。在对镁-钢固相焊接的实施过程中，研究这种连接的结合方式以及控制这种结合方式的条件。通过以下工作的完成，将为镁-钢无匙孔搅拌摩擦点焊的实用化奠定理论基础：①新型无匙孔搅拌摩擦点焊方法及专用装置的研究，为镁-钢搅拌摩擦点焊的实用化创造条件；②采用实测与模拟相结合的方法完成焊接过程中接头温度场模型建立；③接头中实现机械结合影响因素以及在该方式中钢与镁被搅动后的碎块的大小对接头性能的影响程度的研究；④焊接过程中影响合金元素向镁-钢界面两侧扩散的主要因素的确定。

中文关键词： 镁-钢无匙孔搅拌摩擦点焊；连接机理；机-冶复合式接头；温度场；搅拌摩擦点焊装置

英文摘要： Concerning the high-speed development of the automobile, aerospace and other industries,issues focused on magnesium and steel welding needs to be solved around the globe.Due to the remarkably difference in physical properties of magnesium and steel,immiscible ,conventional fusion welding method is unable to achieve secure connection. As for friction stir welding, the connection is accomplished in solid state. Free key hole friction stir spot welding,designed by our research group, is able to achieve lap joint connecion of AZ31B magnesium alloy and DP600 galvanized steel. In the process of magnesium steel solid welding, bonding type and requirements in bonding controll was investigated in this study.By means of the completion of following works, theoretical foundation is established for practical application in magnesium - steel friction stir spot welding without a key hole :①the research for new key hole friction stir spot welding and special devices make the practical application for magnesium - steel friction stir spot welding practical possible; ②temperature field model during welding process was established by the combination of experimental measure and simulation ; ③Influence factors in mechanical bonding joint and influence of the seize of stirred magnesium steel pieces for joint properties were discusse

英文关键词： Mg-steel friction stir keyholeless spot welding；Connection mechanism；Mechanical-metallurgical composite joint；Temperature field；Friction stir spot welding device