Bending fatigue of large welded test pieces with regard to velocity of crack propagation

Abstract

The present series of experiments forms part of the investigations constantly being untertaken by Burmeister & Wain with a view to increasing the safety of diesel engines [1]. In this case the main object was to decide on the often discussed problem of the justification of annealing frames and bed plates after welding; and as the experiment shows an increase in fatigue strength of 20 per cent by annealing at 650° C, it is concluded that such annealing is expedient for components exposed to heavy varying stresses, the most important of which are situated at the surface of the material — at least when operating temperatures are not so high that annealing may be expected to take place during service.