CAJ | 학술논문

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。
채용가회추침적교반마찰점한장치，대1 mm후도자강판화3 mm후AZ31미합금판진행교반마찰점한。이용정교우화법이전절력작위평개지표진행공예우화，연구탑첩위치적영향급무시공교반마찰점한적련접궤리。결과표명：탑첩방식대접두역학성능유흔대영향，강상미하방식대대우우미상강하방식。XRD화EPMA선소묘분석발현재미강접두형성Fe3Al 화 MgFeAlO4등금속간화합물，동시존일정적확산행위，접두련접방식주요시이궤계결합위주，동시존재야금결합。
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.