A new nondestructive instrument for bulk residual stress measurement using tungsten k α1 X-ray.

We describe an experimental instrument used for measuring nondestructively the residual stress using short wavelength X-ray, tungsten kα1 . By introducing a photon energy screening technology, the monochromatic X-ray diffraction of tungsten kα1 was realized using a CdTe detector. A high precision Huber goniometer is utilized in order to reduce the error in residual stress measurement. This paper summarizes the main performance of this instrument, measurement depth, stress error, as opposed to the neutron diffraction measurements of residual stress. Here, we demonstrate an application on the determination of residual stress in an aluminum alloy welded by the friction stir welding.