This study explores the utilization of SiCp/Al composite materials fabricated via powder packed resistance seam welding additive manufacturing. The influence of welding speed on the microstructure and mechanical properties of the specimen was investigated, elucidating the formation and fracture mechanism of a single multilayer deposit. The results demonstrated a dense internal structure of the specimen characterized by uniformly dispersed SiC particles embedded within the Al matrix. However, a few instances of particle agglomeration and porosity defects were observed. The porosity increased with the increase in welding speed, and the microstructure of the RSAM-24 specimen exhibited the highest density, characterized by a density of 2.706 g/cm₃ ^{and a porosity of 1.672%.} The mechanical properties of the specimens exhibited a decrease as the welding speed increased. Optimal mechanical properties were observed when the welding speed was set at 24 cm/min. Specifically, the average hardness, tensile strength, and elongation values were 47.32 HV_0.1, 52.16 MPa, and 2.2%, respectively. The tensile specimens predominantly exhibited fracture along the interlayer bonding interface and the interface between the Al matrix and SiC particles, and the damage mechanics model is ductile fracture.