Abstract
In brazing of Ti-containing stainless steel as a substrate, even under hydrogen atmosphere conditions that reduce the passive film on the stainless steel surface, Ti oxides are not reduced and numerous Ti oxides remain on the entire surface. These are the factors that cause the decrease in wettability, which was clarified from the surface analysis of the substrate. In order to improve the wettability, it is effective to increase the surface free energy of the entire brazed joint surface. As a method to improve the surface free energy of the entire joint surface, we have confirmed that the wettability of a difficult to braze stainless steel was improved by using a material with good wettability as one of the brazing pair substrates.
