铝合金LD10的搅拌摩擦焊组织及性能分析

搅拌摩擦焊是 2 0世纪 90年代发展起来的新型固态塑性连接方法 ,在航空航天结构中铝合金件的焊接方面有很好的应用前景。文中试验研究了航空航天结构件常用的LD10铝合金的搅拌摩擦焊技术。通过工艺试验 ,对其塑性连接时的焊缝成形、焊缝组织形态及接头的力学性能进行了分析。研究结果表明 ,用搅拌摩擦焊方法焊接板厚6mm的LD10铝合金 ,当规范参数合适时 ,可获得外观成形美观、内部无缺陷、几乎无变形的平板对接接头。从显微组织角度 ,焊接接头可分为五个区域 ,即焊核、热力影响区、热影响区、轴肩变形区和探针挤压区 ,各区域的组织有明显的特征。接头的力学性能试验表明 ,接头的抗拉强度可达母材的 87% ,高于熔焊接头的强度 ,断裂位置大多位于热影响区

Microstructure and Mechanical Properties of a Friction Stir Welded LD10 Aluminum

Friction stir welding (FSW)is a new,solid state plastically joining process developed in the beginning of the 1990's.In this paper,an extensive investigation was carried out on the FSW of aviation structural material LD10 aluminum alloy with a thickness of 6 mm.An excellent weld appearance,without void,cracking,or distortion was obtained when the welding parameters were carefully chosen.The joint consists of the weld nugget,the thermal mechanically affected zone,the heating affected zone,the shoulder deformation zone and the pin pressing zone.Within each zone,the microstructure is very different.The mechanical property results shown that maximum joint tensile strength can reach 357Mpa,which is 87% of the parent materials (410 MPa).This is stronger than that of fusion joints,and the failure locations are almost at the heating affected zone.