Brazing of 5A01 aluminum alloy using Al-Cu-Si-Ni filler metal

The vacuum brazing of 5A01 aluminum alloy using Al-Cu-Si-Ni filler metal was investigated at 550 ℃ and 560 ℃, respectively. Microstructure and properties of brazed 5A01 alloy joints were investigated by tensile-shear tests and scanning electron microscopy analysis. The effects of brazing temperature and holding time on the shear strength and microstructure of the joints were studied. The results show that the different intermetallic compounds such as Al-Cu-Ni and Mg2Si formed in the bonding area. Shear strength increased with holding time and brazing temperature. The average shear strengths increased from 42.3 MPa brazed at 550 ℃ for 5 min to 68 MPa brazed at 560 ℃ for 15 min. Discontinuous cracks were found in the joint brazed at 550 ℃ for 5 min, and the joint showed poor shear strength. high shear strength were obtained in the joints brazed at 560 ℃ for 15 min.