Assessment of the mechanical properties of welded joints after wave strain hardening

Abstract

The purpose of this work is to establish the relationship between the modes of wave strain hardening (WSH) and changes in the ultimate strength, microhardness, impact strength of welded joints. The need for these studies is associated with the prevention of destruction of welded joints with the help of their subsequent WSH. The uniqueness of the WSH method lies in the wave loading of the processed material by shock pulses with a given duty cycle, energy and duration. This makes it possible to increase microhardness and form compressive residual stresses at a depth of more than 10 mm, which makes the use of the method promising for increasing the strength of welded seams. These studies have not previously been conducted. Materials 10XCHД, 30XГCA and 40X were taken as objects of research, from which important welded products are often made in industry. As a result of the research, based on the conditions for increasing the strength of welded joints of the selected materials, rational modes of strengthening and the direction of processing have been determined.