Effective joining of Mg/Ti dissimilar alloys by friction stir lap welding
Effective joining of Mg/Ti dissimilar alloys by friction stir lap welding
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搅拌摩擦搭接焊有效连接 Mg/Ti 异种合金
DOI：
10.1016/j.jmatprotec.2019.116483
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发表时间：
2020-04
影响因子：
6.3
通讯作者：
Rui Li
中科院分区：
文献类型：
--
作者：
Qinghua Li;Zhongwei Ma;Shude Ji;Qi Song;Peng Gong;Rui Li
Mg/Ti异种合金采用搅拌摩擦搭接焊（FSLW）进行搭接焊，焊接过程中工具销轻微穿透底部钛合金。对接头微观结构、力学性能和断裂行为进行了系统研究。在搭接界面处形成了与Al富集层相关的冶金结合和依靠底部钛合金表面上的针痕的机械互锁结合。降低焊接速度有利于提高界面结合强度，因为Al富集层变宽，并且针痕更密集，机械互锁得到改善。当焊接速度从120mm/min降至80mm/min时，断裂位置从搭接界面转移到上部镁合金上。相对于基体镁合金，最大接头拉伸剪切强度为 424 N/mm，接头效率达到 89.2%。 FSLW技术为获得高质量的Mg/Ti异种合金接头提供了一种有效的方法。
Mg/Ti dissimilar alloys were lap welded by friction stir lap welding (FSLW) with the tool pin slightly penetrating into the bottom Ti alloy during the welding process. The joint microstructure, mechanical properties and fracture behavior were systematically investigated. The metallurgical bonding associated with an Al enrichment layer and the mechanical interlocking bonding relying on the pin marks on the bottom Ti alloy surface were formed at the lap interface. Decreasing the welding speed was beneficial to increasing the interfacial bonding strength due to the widened Al enrichment layer and the improved mechanical interlocking resulting from the denser pin marks. When the welding speed decreased to 80 mm/min from 120 mm/min, the fracture location transferred to the upper Mg alloy from the lap interface. The maximum joint tensile-shear strength was 424 N/mm and the joint efficiency reached 89.2 % with respect to the base Mg alloy. FSLW technique provides an effective method to acquire a high-quality joint of Mg/Ti dissimilar alloys.
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