TWI

The microstructure and mechanical properties (hardness profiles, tensile strength) of friction stir welded (FSW) joints of ZL114A cast aluminium alloy (Al, 6.5-7.5%Si, 0.45-0.6%Mg), a material of interest for applications in the aerospace industry, were investigated in relation to energy input and welding parameters, and the alloy weldability was evaluated. Trials were performed using a cantilever FSW welder and C type pin tool. Microstructures are presented for the weld nugget, thermomechanically affected zone, HAZ and parent metal (as a function of welding speed and pin tool rotating speed). To assess the effect of PWHT on mechanical properties, some joints were subjected to T6 heat treatment.

5th International Symposium, 14-16 Sep 2004, Session 4A: Metallurgy/Microstructure, Paper 01