Abstract:Two鄄layer core sheets of TC4 titanium alloy four鄄sheet strengthened structure were researched. The
sheets were welded by laser penetration welding instead of traditional superplastic forming/ diffusion bonding ( SPF/
DB) process coated with check flux. The superplastic forming of the core sheets were simulated by ABAQUS finite el鄄
ement analysis(FEM). Optimized pressure鄄time (p鄄t) curve was obtained. The p鄄t curve was used as the pneumatic
loading curve of this process,then use superplastic forming test to verify it. It reveals that the FEM results consist with
the experimental results, the thickness distribution is homogeneous,no weld tear phenomenon occurred. So the pro鄄
posed process is feasible.
