Fatigue Strength Of Steel Shafts Built-Up by Welding

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This paper presents the fatigue test results of steel shafts built-up by welding of 20 and 60 mm in diameter under rotating bending. Using carbon steels for base metal and austenitic stainless steel electrode for build-up welded metal, the influences of build-up welding on the fatigue strength of notched specimens and of build-up welding and shot-peening on the fatigue strength of shrink-fitted shafts were investigated. The following conclusions were drawn. (1) By the build-up welding using an austenitic stainless steel electrode, the fatigue strength of notched specimens increased. (2) In the shrink-fitted specimens built-up by welding, the fatigue strength was slightly lower than that of base metal. However, the fatigue strength was remarkably improved by shot-peening. (3) The fatigue strength of notched specimens built-up by welding can be estimated by calculation.
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