The article describes two methods for measuring residual stresses that differ in the method of measurement. The first method, a method of energy X-ray diffraction, uses atomic planes as measurement sheets and it operates based on the principle of X-ray diffraction. The second method, the hole drilling method, measures residual stresses with resistance strain gauges which are glued onto the surface of the measured sample. Measurements are made on two different welded joints: Niomol 490 K steel and aluminium alloy 7049A. The steel welded joint is made by submerged arc welding (SAW). The aluminium alloy welded joint is made by friction stir welding (FSW). Measurements show good matching in areas where stresses are equally distributed in the thickness, despite the application of different measurement methods.
Keywords: residual stress measurement, hole drilling method, X-ray energy diffraction method