Ctod of 2219 Aluminum Alloy Friction Stir Welded Joints

Fracture property of different regions of 2219 aluminum alloy friction stir welds was studied in terms of crack tip opening dispacement (CTOD).Three-point bending specimens were used to measure the fracture toughness of various regions of 2219 aluminum alloy friction stir welds.CTOD values were calculated according to p-s curves obtained.Results show that the fracture of 2219 aluminum alloy friction stir weld is ductile and the distribution of fracture toughness is heterogeneous;the fracture toughness of weld nugget is the best following thermal-mechanical affected zone and heat affected zone,and base material is the weakest.