Hot-wire laser brazing technology for steel / aluminum alloy dissimilar joint

Abstract

Hot-wire laser brazing was proposed for attaining a lap fillet dissimilar joint of galvanized (GI) steel sheet / A5052 sheet. Our results revealed that relatively sound brazing beads with/without a few defects were obtained at high brazing speeds of up to 4.0 m/min. Furthermore, the average thickness of the brittle intermetallic compounds formed at the joint interface was carefully controlled and ranged from < 1 m to several m. Moreover, a high tensile strength of the joint was realized; this strength is 80 ~ 90 % of the base galvanized (GI) steel strength.