High-strength　aluminum　alloy　fabricated　using　spray　deposition　technology　possesses　many　advantages,　such　as　fine　crystal　grains,　low　component　segregation,　uniform　microstructure,　and　small　internal　stress.　In　this　study,　spray-deposited　2195　Al-Cu-Li　alloy　in　forged　state　was　used　and　welded　using　the　gas　tungsten　arc　welding　(GTAW)　process　to　test　and　verify　the　features　of　the　fusion　joint.　Quantitative　analysis　was　carried　out　to　evaluate　the　relationship　between　the　local　microstructures　and　performances　of　the　fusion　joint,　which　was　composed　of　four　zones:　weld　metal,　fusion　zone,　heat-affected　zone,　and　base　metal.　The　characteristic　quantities　of　each　zone,　including　recrystallized　grain　fraction,　grain　sizes,　grain　misorientation　angle,　and　Vickers　hardness,　and　their　distributions　were　considered　as　the　key　factors　affecting　the　performance　of　the　joint　because　of　welding　thermal　cycle　impact　on　the　fusion　joint.　To　recognize　the　metallurgical　characteristics　of　spray-deposited　alloy　2195,　a　statistical　algorithm　based　on　the　concept　of　the　Hall-Petch　relationship　was　proposed　to　validate　the　actual　test　results,　which　include　the　correlation　effects　of　both　the　filler　wire　and　welding　process.　The　correlation　between　the　microstructures　and　performances　of　several　characteristic　quantities　were　evaluated　by　integrating　the　above　characteristic　information　of　the　fusion　joint　under　the　strong　coupling　of　multiple　factors.　Thus,　the　advantages　of　weldability　of　spray-deposited　alloy　2195　using　GTAW　could　be　understood　in　detail.