Mechanical behaviour of dissimilar friction stir welded tailor welded blanks in Al–Mg alloys for Marine applications

Abstract

Tailor welded blanks (TWB) in Al alloys are an attractive structural solution for application in the shipbuilding sector, mainly due to reductions in weight and lower production costs. In the present study, the global and local mechanical properties of dissimilar friction stir welded TWB were assessed. The joints were manufactured with dissimilar Al-Mg alloys and thicknesses (6 and 8 mm) of particular interest to the shipbuilding sector (AA5083 and AA5059). A digital image correlation system (DIC) linked to a tensile test system was used to characterise the local strain fields, and true stress-strain curves were generated for several TWB sub-zones. Microhardness and DIC analyses showed that the stir zone of the TWB presented overmatching in relation to the weakest base material, and that the joints displayed excellent overall mechanical performance that was comparable to the AA5059 base material in terms of strength and ductility. The fatigue strength was evaluated by means of tension-tension fatigue tests, and the TWB joints reached the fatigue keen with a stress range of 70MPa.

Performance of Friction Stir Welded Tailor Welded Blanks in AA5059 and AA6082 Alloys for Marine Applications

“…The dissimilar materials were welded by FSW in a single run and the thicker material was placed on the advancing side (AS) of the joint in order to facilitate its complete volume plasticization and mixing. This approach is preferable since FSW generates an asymmetric temperature profile and expose the advancing side to higher temperature and strain rates during welding [9,10]. Fig.…”

Effects of Multi-Pass Friction Stir Processing on Microstructures and Mechanical Properties of the 1060Al/Q235 Composite Plate

“…Aluminum/steel composite plate is well known as a kind of common lightweight composite material and has been widely used in automobile, ship, aerospace and pressure vessel fields [1][2][3]. Compared with the single metallic materials, the aluminum/steel composite plate not only has superior properties but also greatly reduces the weight of equipment.…”

Laser welding of dissimilar metallic materials with use of diffractive optical elements

“…Получение их высокопрочных и надежных сварных соединений с другими металлами и спла-вами относится к числу актуальных задач аэрокос-мической промышленности. Формирование соеди-нений разнородных материалов, предоставляющее потенциал для снижения массы конструкций и эко-номии материальных затрат, актуально для широ-кого спектра многочисленных промышленных применений, в том числе: для автомобилестроения [2], судостроения [3] и медицинской промышлен-ности [4]. Сварка алюминия и его сплавов с други-ми материалами сопровождается рядом трудно-стей: большая разница в теплопроводности ведет к интенсивному теплоотводу в сторону алюминия, что препятствует образованию качественного свар-ного соединения.…”