铝/钛、铝/钢及铝/铜异种合金激光深熔钎焊机理及工艺

项目名称： 铝/钛、铝/钢及铝/铜异种合金激光深熔钎焊机理及工艺

项目编号： No.50875005

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 金属学与金属工艺

项目作者： 肖荣诗

作者单位： 北京工业大学

项目金额： 35万元

中文摘要： 结构轻型化、结构功能一体化和低成本设计与制造要求将具有不同特性的材料组合在一起使用。针对熔点差异较大的异种金属的连接,本申请项目提出一种激光深熔钎焊新方法，即采用激光深熔焊接机制，将低熔点母材熔化后直接作为钎料，与尚处于固态的高熔点母材进行对接钎焊。项目在黄铜/低碳钢激光深熔钎焊已取得的研究成果的基础上，选择冶金性能差异性大、而又具有广泛应用前景的铝/钛、铝/钢、铝/铜异种合金，通过系统研究材料成分、表面状态、钎剂、激光光束参数和焊接工艺参数等对钎缝成形、焊接缺陷、合金元素的溶解与扩散、接头界面金属间化合物及焊缝组织性能等的影响规律，掌握激光深熔钎焊的机理和工艺技术，建立理论架构和物理数学模型，为该工艺方法的应用奠定基础。项目研究成果将丰富激光焊接的基础理论，拓展激光焊接应用领域.

中文关键词： 异种金属;激光深熔钎焊;机理;工艺技术;金属间化合物

英文摘要： The requirements of light weight structures, structure and function integration and low-cost design and manufacturing need combination dissimilar materials. For the dissimilar metals which have larger difference in the melting point, this project adopts laser penetration brazing mode. The lower melting point metal is penetratingly melted by the laser power while the higher melting point metal is still kept the solid state. Thus the melted metal liquid wet the solid metal to form a brazing joint. This process is called laser penetration brazing (LPB). Based on the research of brass –low carbon steel laser penetration of brazing, this project select aluminum-titanium, aluminum-steel, aluminum-copper alloy which have larger difference in metallurgical performance and widely application. Through systematic analyzing material composition, surface, flux, the laser beam parameters and welding process parameters, research the factors which affect the forming, defects, alloying elements spread and dissolution, the intermetallics in the interface and the macrostructure of seam.

英文关键词： dissimilar metal; laser penetration brazing; mechanism; process technology; intermetallic compound