Weldability of aluminum alloys based upon the Al–Ca–Zn–Mg system

Based upon calculated data compositions of experimental aluminum alloys, which are characterized by the lowest tendency towards hot brittleness during casting, are selected. Sheets 2.5 mm thick are obtained from ingots of experimental alloys by hot rolling. It is shown that weldability of the Al–1Ca–5.5Zn–1.5Mg–0.5Mn alloy is at the level of that for serial alloy 1915. Analysis of the obtained data shows that cracking characteristics of the Al–2Ca–2.5Mg–0.4Mn alloy (alloy 2) (specimen cracking coefficient and critical deformation rate) are at a level corresponding to AMg3 alloy. The alloys studied with appropriate surface preparation are not prone to pore formation during fusion welding. Mechanical properties of joints of the alloys studied during argon-arc and plasma welding are determined.