Microstructure and Properties of Steel/Aluminum Dissimilar Metal Joint with Transient Liquid-phase Diffusion Bonding Process

The steel/aluminum dissimilar metal was welded by transient liquid-phase bonding process using Al-Si-Cu-Zn filler in argon atmosphere under bonding pressure of 4 MPa. The microstructure and mechanical properties of the transient liquid-phase bonding joint was analyzed by changing bonding temperature.The steel/aluminum dissimilar metal joint was carried out by TLP bonding process. The results show that the microstructure and properties of TLP bonding joint are best with the bonded temperature at 590℃ and heated for 5 min. The shear strength of the welded joint is 22 MPa. The intermetallic compound which often appears in brazing does not appear in transient liquid-phase diffusion bonding.