Abstract: As wire and arc additive manufacturing has been a hot area research among the many additive manufacturing met-hods, and TC4 is the most widely researched titanium alloy. Therefore the macrostructure evolution of the TC4 straight walls manufactured by WAAM was researched in this study. Firstly, the shape parameters of the double ellipsoidal heat source model were validated by single-track and single-layer experiments. The thermal field and thermal changing rate during the deposition process of the four straight walls were simulated using the modified model, and the evolution processes were analyzed by simulation results. The bottom of the straight wall are equiaxed grains and the upper part are columnar grains. The low welding current contributes to the formation of equiaxed grains, but the height of the equiaxed grain zone and the size of the equiaxed grains are independent of the line energy density.
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2018, Vol. 32 
