An　argon　TIG　welded　joint　of　the　Al　-　Zn　-Mg　-　Cu　alloy　was　studied.　Based　on　the　hardness　and　differential　scanning　calorimetry　studies,　a　post-weld　alloy　heat　treatment　regimen　has　been　proposed　to　ensure　a　welded　joint　strength　of　622　MPa　versus　the　strength　of　the　base　metal　of　676　MPa.　The　post-weld　heat　treatment　provides　for　a　two-stage　solid　solution　treatment　(470　degrees　C,　90　min　+　500　degrees　C,　20　min)　and　artificial　aging　at　120　degrees　C　for　24　h.