Corrosion fatigue of welded joints from rolled structural and cast steels for mechanical, bridge, automotive engineering and marine technology

: Lipp, K.; Sonsino, C.M.; Lachmann, E.

Abstract
By welding of cast steel intersections between rolled structural steels the welds can be removed to areas of low stresses and so the fatigue life of the structure can be improved significantly. However, for a safe and economic design the knowledge of the fatigue behaviour of weldings between cast and structural steels under corrosion is required. Since such fatigue data was not yet available, the fatigue behaviour of butt welded joints between cast and structural steels having a minimum yield strength of 500 MPa was investigated in artificial sea water under loading spectra which are typical for offshore structures. Tests were performed with a loading ratio of R equals -1 under free corrosion as well as under cathodic protection with a potential of -1080 mV against calomel and a frequency of f equals 10 s high -1. For the random fatigue tests two different loading spectra, the so-called ECSC- and the WASH1-Sequence, were used.