TC17 titanium alloy sheet is welded with tungsten inert gas arc welding (TIG) and electron beam welding (EBW)

and tensile tests are carried out. Based on tensile test result and fracture morphology

relationship between mechanical properties with microstructure of welded joint is analyzed. The research results show

when TC17 alloy is heated by TIG arc

grains in the weld bead and heat affected zone (HAZ) are badly coarsening. The heat affected zone of EBW is relatively narrow

and there is no coarse grain zone. Tensile strength of two welding methods are both strong as the base metal and the relative elongation is deceased

mainly because of the microstructure change of the heat affected zone and the weld. Compared with EBW

the micro structure of TIG joint is more coarse.