Study of energy dissipation and rigidity of welded joints obtained by pressure butt welding

Introduction. When studying the energy dissipation associated with internal friction in a weld, it is extremely important to choose a measurement technique, since the reliability and integrity of the data obtained depends on it. At the same time, it is necessary to investigate the change in internal friction depending on the presence of defects in the weld. Of the variety of methods for non-destructive testing of joints obtained by pressure welding, only ultrasonic is currently used. However, lightly oxidized lacks of welding penetration are not detected, which can be detected only in the presence of other defects accompanying it. Compounds of dissimilar materials are not controlled by ultrasound at all. Therefore, the development of non-destructive testing methods for such compounds is very relevant. The purpose of the work: to find a procedure for testing the quality of a welded joint in metals and alloys that will be a quick and simple alternative to the known methods of non-destructive testing, by measuring the energy dissipation in the weld of the sample by the static hysteresis loop method. The method of investigation is non-destructive quality control of the welded joint in metals and alloys by measuring the energy dissipation in the weld of the sample by the static hysteresis loop method. Results and discussion. It is established that with an increase in the lacks of welding penetration, the energy dissipation increases at the same values of the torque amplitude under static loading conditions. The rigidity of the qualitative welded joints remains constant, and the joints with lacks of welding penetration decrease with increasing torque amplitude. The relationship of strength with stiffness and damping ability obtained by the static hysteresis loop method is preserved for various structural states of the sample material.