This paper describes a stress measurement from a welded part of an austenitic stainless steel using synchrotron X-rays. Observing the diffractions from a single crystal, coarse grained material and the welded part, the diffraction pattern of the welded part shows the feature of textured materials with large grains. Difficulty measuring the X-ray stress of the welded part is caused by the broadening of the diffraction spot in the radial and circumferential directions. The bending strains of the rectangular bar made of the welded part were measured using synchrotron white X-rays and the double exposure method. However, the results were not enough accuracy to obtain the strains. To improve the energy resolution, monochromatic synchrotron X-ray of 70 keV was used. The diffraction pattern showed the sharp arc like a pattern from texture material. The diffraction profile was obtained from the integral of the diffraction intensity in the direction of the circumference. The diffraction angle was determined using the double exposure method. As a result, the distribution of the residual stresses of the welded part could be measured.
