ユニオンメルト自動熔接罐胴の残留應力と燒鈍に依る應力緩和度の測定

概要

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The residual stresses of the Unionmelt arc welded pressure vessel were measured on the longitudinal and circumferential weld lines. For the longitudinal seams, the same measurement was made after the 2.5 hours annealing at the temperature of 625±25℃, and tested the effect of stress relief by annealing. For the thick plate such as this test drum, the residual stresses are triaxial and have certain distribution in the direction of thickness. Therefore, the successive slicing method, developed by D. Rosenthal and J. T. Norton, was used for this investigation. As the result of measurement, the residual stresses of maximum about 50kg/(mm)^2 was found in the both longitudinal and transverse directions of the interior of the longitudinal weld lines. These stresses were diminished to about 10kg/(mm)^2 by annealing. In the interior, the residual stresses on the circumferential weld lines are about 20kg/(mm)^2 in tension. This value is less than those of the longitudinal weld line; on the both surfaces, they are in compression. The residual stresses in the direction of thickness are highest in the middle part but they are very small and less than 1kg/(mm)^2.
1955-07-10