In order to eliminate the disadvantages of the keyhole in conventional friction stir spot welding joint and attain the high-strength lap joint of Al/Cu dissimilar metals, a novel welding technique, named as friction stir spot riveting (FSSR), was proposed. A pinless tool and an extra filling stud were employed. The Al/Cu spot joints without keyhole defect were achieved by the FSSR. A Cu anchor-like structure was formed, which greatly increased the mechanical interlocking between the upper Al sheet and lower Cu sheet. The thin intermetallic compounds containing CuAl₂ and CuAl at the Al/Cu interface strengthened the joining interface between the Al sheet and the Cu stud. Increasing rotating velocity increased frictional heat and plastic deformation and then eliminated the interfacial joining defects. The FSSR joint with the maximum tensile shear load of 3.50 kN was achieved at a rotating velocity of 1800 rpm and a dwell time of 20 s, whose fracture path passed through the softened region of upper Al sheet. In summary, the novel FSSR technique has the advantages of strong mechanical interlocking and metallurgical bonding between dissimilar materials, thereby attaining the high-strength spot joint.

为了消除传统的搅拌摩擦点焊接头中的锁孔的弊端，并获得高强度搭接的铝/铜异种金属，提出了一种新的焊接技术，称为搅拌摩擦点铆（FSSR）。使用无针工具和额外的填充螺柱。FSSR实现了无钥匙孔缺陷的Al / Cu点焊。形成了铜锚状结构，大大增加了上铝板和下铜板之间的机械互锁。含有CuAl _2的金属间化合物Al / Cu界面处的CuAl增强了Al板与Cu螺柱之间的连接界面。增加旋转速度会增加摩擦热和塑性变形，从而消除了界面连接缺陷。在1800 rpm的转速和20 s的停留时间下，获得了最大拉伸剪切载荷为3.50 kN的FSSR接头，其断裂路径通过了上部Al板的软化区域。综上所述，新颖的FSSR技术具有机械互锁性强，异种材料之间冶金结合的优点，从而获得了高强度的点焊接头。