In this article

TA15 titanium alloy was welded by electron beam welding with different process parameters

the morphology of welded joints were investigated by observing the morphology of the welded joints and measuring the shape parameters

and the microstructure of the welding joint was analyzed. The results show that the weld penetration

half of width and weld width increase when the electron current increases

and the weld shape changes from the nail shape to the bell shape. The welding speed has little effect on the weld shape

the weld penetration

half of width and weld width decreases with the increase of the welding speed

and the ratio of depth to width increases first and then decreases. The increase of focusing current has a large effect on the weld penetration

but the half of width and weld width change little. when the scanning amplitude increases

the weld penetration decreases

half of width increases. The heat affected zone (HAZ) near the base metal was similar to the base metal

Which was mainly composed of the primary equiaxed α phase and transformed β phase

and the acicular (α+β); The HAZ near the fusion line was consist of α phase and acicular (α+β)

and appear α´; the microstructure of fusion zone was α´

the columnar crystals grew perpendicularly to the weld center

and single or multiple columns of equiaxed grain formed in the weld center.