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The electron beam welding process of titanium alloys induces a series of physicochemical
changes in the material that remain a relevant and necessary area of investigation. A necessary
step performed after the electron beam welding process of titanium alloys in the Ti6Al-4V grade to
mitigate the resulting thermal stresses is the post-weld heat-treatment process conducted through
stress relieving. This study presents the comparative analysis results of the mechanical properties
and structure of the Ti6Al-4V titanium alloy after electron beam welding and subsequent stress-
relieving heat treatment at a temperature of 590 ◦C for 2 h. The analysis focused on the levels of
mechanical properties such as microhardness in the heat-affected zone and weld, tensile strength, and
microstructure analysis in the heat-affected zone and weld. The aim of the research was to answer
the questions regarding whether the post-weld heat treatment through stress relieving after electron
beam welding of the Ti6Al-4V titanium alloy would significantly affect the changes in mechanical
properties and microstructure of the alloy and whether the applied welding speed in the study would
cause a significant depletion of alloying elements in the material. During the course of the study,
it was found that conducting the electron beam welding process at a speed of 8 mm/s resulted in
a depletion of one of the alloying elements (aluminum) in the face area. However, the decrease in
aluminum content was not significant and did not exceed the critical value of 6% specified in the
material standards, which determined the material’s application based on its strength properties.
