Welding of large gaps of block joints in ships using different techniques
Advances in Marine Structures - Proceedings of the 3rd International Conference on Marine Structures, MARSTRUCT 2011, Hamburg, Germany, 28 - 30 March 2011 (): 559-566 (2011)
Contribution to Conference
When welding block joints of ships it may occur that the gaps between them are relatively large. Furthermore high stresses due to the constraint conditions may result in high residual stresses. Therefore an investigation was performed to determine if gap widths up to 30 mm fulfil the requirements regarding the fatigue and fracture strength. The welding of butt joints at 250 mm wide plates was performed under definite constraints presenting the surrounding ship structure. Among other parameters the welding method (string-bead, weaving technique) was varied. During the welding the reaction force was measured and it was noticed that it was remarkably higher for the weaving technique compared to the string-bead technique. Both welding techniques lead to different fracture and fatigue results. The weaving technique seems to be more adequate when welding large gaps. A numerical welding simulation using the weaving technique showed compressive plastic strains in the root layer that maybe reasonable for the good results. Generally the investigations indicated a clear influence of welding technique on the fatigue and fracture strength. The gap width did not have a significant influence. © 2011 Taylor & Francis Group, London.