【摘要】 异种材料焊接技术由于其有节约贵重材料、降低成本、发挥不同材料特性等优势,在机械、化工、电力及核工业等行业得到广泛的应用。相比传统的同种材料焊接,异种材料焊接研究在接头性能及组织表征方法、成型原理以及强化机理等方面有显著差异。因而,该实验设计在传统焊接实验基础上进行了拓展。主要包含三个阶段,分别是异种焊接工艺的实施、显微组织表征与力学性能表征。其中异种材料焊接选择铝合金和钢,进行机器人弧焊。焊接接头显微组织表征,包含了不同尺度测试手段,从光学显微镜、扫描电镜,到透射电镜进行纳米尺度的高分辨观察,力学性能表征包含焊接接头硬度测试和拉伸性能测试,不仅增强了学生对不同焊接技术研究手段的了解,更培养了学生设计科学系统实验方案的科研能力。更多还原

【Abstract】 Dissimilar material welding technology is widely used in machinery, chemical, electric power and nuclear industries due to its advantages such as saving valuable materials, reducing costs, and taking advantage of different material characteristics. Compared with the traditional welding of the same material, the research of dissimilar material welding has significant differences in joint performance and microstructure characterization methods, forming principles, and strengthening mechanisms. Therefore, the experimental design is expanded on the basis of traditional welding experiments. It mainly includes three stages, which are the implementation of dissimilar welding process, microstructure and mechanical property characterization. Aluminum alloy and steel are selected for dissimilar materials in robot arc welding. The microstructure characterization of the welded joints includes different scale testing methods, from optical microscopy to scanning electron microscopy, and transmission electron microscopy for high-resolution observation at the nanoscale. The mechanical performance characterization includes hardness testing and tensile testing of welded joints, which not only enhances students’ understanding of different welding research methods, but also cultivates students’ scientific research ability to design scientific and systematic experimental schemes.更多还原