Residual Compressive Stress to Increase Strength of Welded Constructions Using Mobile Processing Methods

Abstract

Abstract Can residual compressive stress, which is etablished using mobile processing methods without the use of specially designed equipment (mobile blasting systems or special hammering equipment), i. e., without noteworthy machine investment, significantly increase the fatigue strength of welded structural steel structures? To answer this question, samples were welded, ground and/or brushed, residual stress states were determined and fatigue tests were carried out. The results obtained show why welded constructions often are characterized by a very different service life. Currently, however, the last operation is not yet used in a standardized, targeted and prescribed manner to ensure a defined and repeatable residual stress state on the surface and thus guarantee a superior fatigue strength of welded assemblies.