抄録
In order to assess structural integrity for operating welding structures, it is important to evaluate three-dimensional welding residual stresses non-destructively. Then the bead flush method has been proposed. In this method, welding residual stress distributions for whole structure are calculated by an elastic FEM (Finite Element Method) analysis from eigen-strains those can be evaluated quantitatively by the inverse analysis from released strains measured by strain gauges in the removal of the reinforcement of the weld. However, the estimation accuracy of this method becomes poor if inelastic strains are newly created during the removal process. In this study, a calculation technique to assess eigen-strains included processing strains estimated by X-ray diffraction is shown, and estimation accuracy of welding residual stress on the rear surface calculated from residual strains on the front surface with measurement errors is evaluated numerically. If this method is established, the reinforcement of the weld can be machined easily and accurately in the measurement process.
