This study focuses on the bonding interface characteristics and mechanical properties of the bobbin tool friction stir welded dissimilar AA6056 and AA2219 aluminum alloy joints using different welding speeds. Voids arise solely in the stir zone at the AA2219 side. A distinct boundary with limited material mixing develops at the middle section of the bonding interface, while excellent material mixing with an irregularly jagged pattern forms at the top and bottom sections of the bonding interface. Increasing the welding speed, the material mixing is rarely changed at the middle section in comparison with the bottom section. Furthermore, a small difference between Guinier–Preston dissolution and Q phase precipitation leads to rare change of hardness in the heat affected zone (HAZ) at the AA6056 side. The increased hardness of the HAZ at the AA2219 side is attributed to avoidance of the dissolution of θ″ phase precipitates. A maximum tensile strength of 181 MPa is obtained at 300 mm min⁻¹. Fractures occur at the AA6056 side near the top and bottom surfaces and at the bonding interface in the middle section of the joints. The regions close to the top and bottom surfaces of the joints show a better ductility.

这项研究的重点是使用不同焊接速度的骨架工具摩擦搅拌焊接异种AA6056和AA2219铝合金接头的粘结界面特性和力学性能。空隙仅出现在AA2219侧的搅拌区。在粘接界面的中间部分出现了材料混合受限的明显边界，而在粘接界面的顶部和底部形成了具有不规则锯齿状图案的出色材料混合。增加焊接速度，与底部相比，在中间部分的材料混合很少改变。此外，Guinier-Preston溶出度和Q之间有微小差异相沉淀导致AA6056侧热影响区（HAZ）硬度的罕见变化。HAZ在AA2219侧的硬度增加归因于避免θ ''相沉淀物的溶解。在300mm min ^-1下获得181MPa的最大抗拉强度。断裂发生在靠近顶面和底面的AA6056侧以及接头中间部分的粘结界面处。靠近接头顶面和底面的区域具有更好的延展性。