In　this　paper,　the　effects　of　two　solid　solution　processes,　single-stage　solid　solution　(SHT)　and　two-stage　solid　solution　(S-SHT),　on　the　precipitated　phases　and　corrosion　behavior　of　Al-Cu-Mg-Ag　in　wire　arc　additive　manufacturing　were　investigated.　It　is　found　that　S-SHT　is　a　composite　solid　solution　with　relatively　small　pore　coarsening　and　narrower　grain　boundary　precipitation-free　zone,　which　provides　better　mechanical　properties　and　corrosion　resistance　than　SHT.　SHT　is　little　affected　at　the　aging　temperature,　and　the　precipitated　phases　are　lath-like　θ′　and　Ω　phases.　The　aging　precipitation　phases　of　S-SHT　are　significantly　affected　by　the　aging　temperature.　S-SHT165　precipitated　phase　is　mainly　fine　θ′　phase,　while　S-SHT185　precipitated　phase　is　mainly　lath-like　Ω　phase.　©　ASM　International　2024.