论文部分内容阅读
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
Friction stir welding is a new type of solid state plastic connecting method developed in the 1990s. It has good application prospects in the welding of aluminum alloy parts in aerospace structures. In this paper, the friction stir welding technique of LD10 aluminum alloy, which is commonly used in aerospace structural parts, is experimentally studied. Through the process experiment, the forming of the weld, the microstructure of the weld and the mechanical properties of the joint were analyzed. The results show that welding LD10 aluminum alloy with 6mm plate thickness by friction stir welding can get flat butt joints with beautiful appearance, no internal defects and almost no deformation when the proper parameters are obtained. From the microstructure point of view, welded joints can be divided into five areas, namely, weld core, heat affected zone, heat affected zone, shoulder deformation zone and probe extrusion zone, and the regional organizations have obvious characteristics. Mechanical properties of the joint test showed that the joint tensile strength up to 87% of the parent material, higher than the welded joint strength, fracture location mostly in the heat affected zone