COMMITTEE V.6/FABRICATION TECHNOLOGIES

摘要

Regarding materials it is interesting to note that in the search for lightweight designs new Aluminium and Titanium alloys seem to offer interesting options, whilst at the same time also high strength steels will have their place provided the matter of residual stresses in the rolling process and subsequent non destructive detection possibilities are properly solved. Titanium suffers from its relatively new appearance as a structural material and bears an image of an exotic and hence expensive material, and its use had been restricted to aeronautical and biomedical applications. Consequently, it's difficult for this recent material to compete without references with steel or aluminium, strongly established in the structural material market. Nevertheless, titanium must be considered wherever corrosion is a problem or weight a factor, appearing as an elegant solution. Furthermore, the new elaboration process may open wider economic opportunities and could be the trigger for a full size industry. FRP/Composite materials gain added attention in connection with adhesive bonding technologies both, with respect to light weight designs and to cost reductions. The problem of fire resistance needs particular attention in this matter. Regarding welding consumables there is still need for research concerning new analytical practices to select more resilient welding consumable compositions and process parameters to reduce weld rework for welding steels of a large compositional range. Also the problem of new low hydrogen welding consumables based on the use of irreversible hydrogen trapping and fluoride additions needs to be revisited. It is also necessary to develop, evaluate and demonstrate advanced electronic and magnetic sensors for rapid diffusible hydrogen content determination on welded structures, not just on qualification coupons. The problems associated with environmental and health conditions related to welding need further observation.