Abstract
Recently, ductile nickel base brazing foil has been prepared by a rapid solidification technology. So that it seemed that the brazing, which used the ductile nickel base brazing foil, is more effective method for joining having a large joining area than the brazing which used the powder form nickel base brazing filler metal. Therefore it has seemed that the brazing, which used the nickel base brazing foil, has been effective method for producing of the clad materials.
In this study, the clad material which have been brazed the nickel base heat resistant alloy; Inconel 600 on the mild steel; SM400B has been tried producing by the brazing using the four types of nickel base brazing foils. The brazeability was estimated by the mechanical properties, microstructures and the distributions of the elements which were investigated with a SEM and a EPMA examination.
The sound joint was obtained for all of brazing conditions in this study. The shear strength of the specimen was increased by increasing brazing time and temperature. About 310 MPa was obtained as the maximum shear strength for every brazing foil. The shear strength was influenced by the cross-sectional microstructures at the brazed joint. According to the cross-sectional microstructures and the elemental distributions, when the eutectic structure concentrating Cr and B was formed in the brazed joint, the shear strength was increased by decreasing this eutectic structure.
