镁钢无匙孔搅拌摩擦点焊 / Friction stir keyholeless spot welding of AZ31 Mg alloy-mild steel
- Resource Type
- Academic Journal
- Authors
- 张忠科; 王希靖; 王培中; 赵刚; Zhong-ke ZHANG; Xi-jing WANG; Pei-chung WANG; Gang ZHAO
- Source
- 中国有色金属学报(英文版) / Transactions of Nonferrous Metals Society of China. (6):1709-1716
- Subject
- 无匙孔搅拌摩擦点焊
异种材料
力学性能
friction stir keyholeless spot welding
dissimilar alloys
mechanical property
- Language
- Chinese
- ISSN
- 1003-6326
采用可回抽针的搅拌摩擦点焊装置,对1 mm厚镀锌钢板和3 mm厚AZ31镁合金板进行搅拌摩擦点焊。利用正交优化法以剪切力作为评价指标进行工艺优化,研究搭叠位置的影响及无匙孔搅拌摩擦点焊的连接机理。结果表明:搭叠方式对接头力学性能有很大影响,钢上镁下方式大大优于镁上钢下方式。XRD和EPMA线扫描分析发现在镁钢接头形成Fe3Al 和 MgFeAlO4等金属间化合物,同时存一定的扩散行为,接头连接方式主要是以机械结合为主,同时存在冶金结合。
Friction stir keyholeless spot welding (FSKSW) using a retractable pin for 1.0 mm thick galvanized mild steel and 3 mm thick AZ31B magnesium alloy in a lap configuration was investigated. The process variables were optimized in terms of the joint strength. The effects of the stacking sequence on joint formation and the joining mechanism of FSKSW AZ31B-to-mild steel joints were also analyzed. It shows that the process window and joint strength are strongly influenced by the stacking sequence of the workpieces. While the process window is narrow and unstable for FSKSW of a magnesium-to-steel stack-up, a desirable process was established for the steel-to-magnesium stacking sequence, a desirable process and higher strength joint can be got when the steel-to-magnesium stacking sequence. XRD phase and EPMA analyses of the FSKSW joint showed that the intermetallic compounds are formed at the steel-to-magnesium interface, and the element diffusion between the mild steel and AZ31B magnesium alloy revealed that the joining methods for FSKSW joints is the main mechanical joining along with certain metallurgical bonding.