摘要
针对8 mm厚2219铝合金进行可回抽搅拌摩擦焊工艺试验,详细分析了回抽过程中搅拌针运动轨迹、不同回抽位置的接头组织形态及力学性能.结果表明：搅拌针的运动轨迹是焊接速度与搅拌针相对于轴肩回抽速度的合成运动轨迹,并呈现出一定的线性关系.回抽结束处和回抽起始处的接头组织形貌为典型的常规搅拌摩擦焊接头,位于中间回抽区域的焊接接头可以认为是100％焊透的焊接接头与“相同直径的轴肩＋（100％～0％） ＆#215;L的搅拌针”形成的焊透深度逐渐变浅的常规搅拌摩擦焊接头复合形成的.接头力学性能测试结果表明：回抽结束处的性能最高,回抽起始处的性能次之,中间回抽区域的力学性能最低,并且随着回抽距离的逐渐增加,中间回抽区域的力学性能逐渐增加.不同回抽位置的搅拌摩擦焊接头均呈现出典型的韧性断裂形貌.
An extensive investigation was carried out on the retractable friction stir welding of 2219 aluminium alloy with the thickness of 8 mm, and the retractable track, microstructure and mechanical properties of the welding joint at the different locations have been analyzed. The results indicated that the actual trajectory of the RPT is the combination of welding speeed and retracting speed, and showed a linear relationship. The morphology at the begin- ning and end of the retractable FSW welded seam showed a typical conventional FSW microstructure, while the joint located in the middle of the retractable FSW welded seam can be considered as the composite of a 100% penetration welded joint and a joint with gradually shallower depth. The results of the tensile test indicated that the mechanical property of the joint at the end of weld seam is the highest, followed by the joint loacated at the beginning and middle of the retractable FSW welded seam. With the retracting distance increasing gradually, the performance of the joint in the middle of the retractable FSW welded seam also gradually increased. The fracture mechanism of the joint at differ- ent position is all ductile fracture.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2014年第2期42-48,共7页
Aerospace Materials & Technology
关键词
可回抽搅拌摩擦焊
回抽轨迹
组织形态
力学性能
Retractable friction ftir welding technology, Retractable track, Microstructure, Mechanical property
