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) …

The demand for steel/aluminum alloy dissimilar joints has increased for light-weighting the
automobile body. However, it is well known that joining both metals by conventional welding
methods, the brittle intermetallic compound (IMC) is generated at the interface, and it
significantly deteriorates the joint strength. In this paper, the hot-wire laser brazing process
using the twin-spot irradiation was proposed and its conditions were optimized to achieve
the high brazing speed and the high joint strength on a lap-fillet joint of the steel/aluminum …