The microstructures and mechanical properties of 5A06 aluminum alloy joints welded by electron beam welding were investigated.The results showed that the welding energy density and welding heat input had important influence on weld morphology,organization and performance.With the increase of focusing current and welding heat input,the weld width gradually increased,and the heat-affected zone gradually widened.The center of the electron beam weld was uniform fine isoaxial crystal with no obvious directionality,and fine isoaxial bands were formed near the bond line.With the increase of welding heat input,the content of Mg element in the weld decreased,and the grain size of the weld became larger,leading to the decrease of the mechanical properties of the welded joints.
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