electron beam welding 6061-T6 alloy 1 Al6061-T6 1 Alloy materials 1 Aluminium 6061 1 Aluminum 6061-t6 alloy 1 Corrosion 1 Defects 1 Electron beam welding 1 Electron beams 1 Electron-beam welding 1 Heat affected zone 1 Microstructural characteristics 1 Numerical and experimental study 1 Numerical methods 1 Numerical models 1 Parameter set 1 Tensile strength 1 Welding parameters 1 Welding process 1 mechanical properties 1 microstructural characteristics 1 microstructure 1 numerical analysis 1 numerical modeling 1 residual stress 1