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分别采用卷制工艺、冲压工艺和机械加工工艺制备铝合金轮毂的轮缘、轮辐和轮毂,将其焊接成铝合金轮毂,进行检验和测试。结果表明:705合金在退火、固溶处理状态下都有软化倾向,可进行后续的轮缘卷制和轮辐冲压;焊接接头的母材热影响区晶粒粗大,焊缝区为等轴晶组织;焊缝区的断裂方式为延性断裂;铝合金轮毂的显微组织致密,纵向组织中未溶解相沿板材轧制方向分布且结构明显,横向组织中各向异性较小;铝合金轮毂的抗拉强度Rm为400~515 MPa、屈服强度Rp0.2为330~450 MPa、伸长率A为9%~17%。
The rims, spokes and wheels of the aluminum alloy wheels are respectively prepared by a rolling process, a stamping process and a machining process, and the wheels are welded into an aluminum alloy wheel hub for testing and testing. The results show that the alloy 705 has the tendency of softening in the condition of annealing and solution treatment, and the subsequent rim rolling and spoke pressing can be carried out. The grain size of the HAZ in the welded joint is coarse and the weld zone is equiaxed The fracture mode of the weld zone is ductile fracture. The microstructure of the aluminum alloy wheel hub is dense. The undissolved phase in the longitudinal structure distributes along the rolling direction of the plate and has obvious structure with small anisotropy in the transverse structure. The tensile strength of the aluminum alloy wheel The strength Rm is 400-515 MPa, the yield strength Rp0.2 is 330-450 MPa, and the elongation A is 9-17%.