Microstructure and Tensile Strength of Rust-Proof Aluminum Plate and Zinc-Coated Steel Plates Braze-Weld Joint Prepared by Cold Metal Transfer

The cold metal transfer (CMT) brazing-welding process was used to weld dissimilar metals of LF21 rust-proof aluminum plate and DD51D+Z zinc-coated steel plate, and the microstructure and tensile strength of the joint were studied. The results show that the compound layer of middle interface zone of the braze-weld joint was intermetallic compound FeAl3 with thickness of 4-6 μm. The average transverse tensile strength of the joint was up to 77 MPa and strength coefficient was 0.6.