PSI - Issue 13

Evy Van Puymbroeck et al. / Procedia Structural Integrity 13 (2018) 920–925 Evy Van Puymbroeck et al./ Structural Integrity Procedia 00 (2018) 000 – 000

924

5

the deck plate are considered. Only half of the width is taken into account since the residual stress results are symmetrical around the middle line. The residual stress results are shown in Graph 1. The variation of the size of the tack welds has no influence on the residual stresses. The value of the residual stresses is exactly the same for all variations of the tack weld size.

Graph 1. Transverse residual stresses with variation of tack weld size.

7.2. Welding current To determine the influence of the welding current on the residual stresses, additional simulations compared to the reference model are assumed with welding current of 580 A, 680 A, 880 A and 980 A. In Graph 2, the residual stress results for welding currents of 580 A, 780 A and 980 A are shown. From these results, it can be concluded that the higher welding currents results in lower tensile residual stresses and a smaller tensile yield zone, the compressive residual stresses are also lower. No large difference in residual stresses is noticed when the welding current is less than 780 A. So a higher welding current than 780 A will be beneficial to reduce the tensile residual stresses.

Graph 2. Transverse residual stresses with variation of welding current.