Method for processing welded metal work joints by high-frequency hummering

The inventive method relates to reinforcing treatment of welded metalwork joints using a power ultrasound. Said method can be used for mechanical engineering, shipbuilding, bridge engineering and other branches of industry and construction producing welded structures which can be safely used at conditions of static, dynamic and repeated-variable loading. The inventive method consists in specifying the method for calculating normalised residual compressive stresses to be produced by an ultrasound impact processing. Said stresses are related to the geometrical dimensions of a groove formed when the area disposed along a line between the joint and a base metal is treated. Said invention makes it possible to maximally increase the fatigue limit and the cyclic life duration of welded joints.