Abstract
We present results of fatigue testing of strengthened butt-welded joints of St. 3sp steel subjected to various modes of high-frequency mechanical forging. As the treatment effectiveness criterion, we propose to use the groove depth in the work-hardened area. The optimal values of groove depth and high-frequency mechanical forging rates have been determined at various vibration amplitudes of the forging tool, which ensure the maximum fatigue life of butt-welded joints. The effect of high-frequency mechanical forging on fatigue strength of butt-welded joints with account of their particular manufacturing technologies is discussed.
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