Investigation of Cold Pressure Welding for Al/Cu Dissimilar Metals
摘要
1060 aluminum alloy and T2 copper were butt welded by cold pressure welding. The effect of preheating temperature on the microstructure and properties of welded joints was studied. The mechanical properties of the joints were evaluated through tensile strength tests, and the microstructure and phase of the joints were analyzed by SEM, EDS, and XRD. The results showed that when the preheating temperature was 400 °C, aluminum and copper achieved atomic bonding, and no intermetallic compounds were formed at the welding interface. At this temperature, the joint exhibited the highest tensile strength, reaching 131 MPa, and the lowest resistivity, which was measured to be 2.409 × 10−8 Ω·m. As the preheating temperature increased, the mechanical properties of the weld seam declined and the resistivity increased. When the preheating temperature reached 450 °C, the tensile strength of the joint dropped significantly and the resistivity increased markedly.