Technical Paper
Fatigue Life Prediction of Arc Welded Steel Specimens under Multiaxial Loads Including Bead Shape Effects
2024-04-09
2024-01-2257
This study deals with the fatigue life prediction methodology of welded components involving arc welding. First, a method for deriving the cyclic deformation and fatigue properties of the weld metal ER70S-3 used in automobile parts is explained using solid bar specimens. Then, welded tube specimens were used with two symmetric welds and subjected to axial, torsion, and combined in-phase and out-of-phase axial-torsion loads. In most previous studies the concentrations caused by the welding process were arbitrarily removed by overlapping the starting point of the arc weld bead to reduce data scatter. However, in this study the two symmetric welds include weld start/stops causing stress concentrations due to the shape of the weld bead generated after the welding process in order to deliberately expose these stress concentration areas to an applied stress.