The outer wing wall of civil aircraft is usually constructed with T-truss structure. The long girder connection structure at the root of the wing is a vital force transmission structure. The long truss structure at the root of the wing is mainly connected with the corresponding corner box. In this paper

the evolution rule

mechanical properties

and defects of titanium alloy long girder angle box of civil aircraft were studied by using laser stereotyping technology. The internal microstructure of the furnace sample is small rod-shaped α phase

there is no anisotropy in performance

and is net basket structure. The tensile strength of the test block in the X、Y and Z directions is higher than 889 MPa

and the degree and dispersion of its deviation from the average tensile strength in three directions of X、Y and Z are not exceeded over 5%

indicating good overall performance; The tensile fracture of the sample belongs to ductile fracture

and the tensile fracture is composed of three parts: fiber zone

radiation zone

and shear lip zone. Fatigue fracture is plastic fracture

and in fatigue fracture

secondary cracks are continuous and dense. The size and forming quality of the processed sample meet industry usage requirements.