Effects of Surface Roughness on the Fatigue Strength of Brazed Joint

概要

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The purpose of this study is to make clear the effect of surface roughness of base metal on the fatigue strength of the brazed joint. The materials used in this experiment are mild steel (SS41) as the base metal and BAg8 eutectic alloy as the filler metal. In this experiment, each brazing surface of base metal was polished with various emery papers, and other specimens were machined by various mechanical processes. The results obtained in this experiment are as follows : (1) In the specimens polished with emery papers, the fatigue strength of a specimen polished with 120 mesh emery paper was the highest, its value being 17.5 kg/mm^2 and that of one plished with 600 mesh emery paper was the lowest, its value being 10.5 kg/mm^2. (2) In the case of the machined specimens, the fatigue strength of a specimen machined by milling cutter was the highest and that of one superfinished by 240 mesh grinding stone was the lowest. (3) From these results, it is clear that the fatigue strength of a specimen with coarse surface is higher than that of one with smooth surface. This comes from the difference in the actual brazed area of each specimen and other physical property.
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