Abstract
The purpose of this study is to investigate the fundamental phenomenon of fatigue strength of brazed joint. Torsional fatigue strength of brazed butt joint was measured, and some presumptions as follows for the fatigue strength of brazed joint were discussed.
1) Filler metal which does not have a fatigue limit in a form of bulk has fatigue limit in a brazed gap when the strength of base metal is higher than that of filler metal.
2) The fatigue strength of brazed joint does not have the direct relation with the static strength.
3) The effects of base metal strength and joint gap on fatigue strength of brazed joint should be discussed as the relation between joint geometry and small scale plastic deformation at crack tip in filler
