Correlation　between　the　ultimate　tensile　strength　and　the　hardness　of　aluminum　alloy　2219　and　its　joints　welded　with　a　variable-polarity　tungsten　electrode　in　inert　gases　(VPTIG)　and　by　friction　stir　welding　(FSW)　is　studied.　The　yield　strength　(sigma(y))　and　the　ultimate　strength　(sigma(r))　of　the　base　metal,　the　microhardness　and　the　strain　hardening　coefficient　of　the　welded　joints　are　determined.　Linear　correlation　dependences　are　suggested　for　the　yield　strength,　the　ultimate　strength,　and　the　hardness.　The　strain　hardening　coefficient　and　the　ratio　sigma(y)/sigma(r)are　shown　to　be　correlated.　The　correlations　are　based　on　the　measurement　of　microhardness　and　can　be　used　for　predicting　the　strength　of　fusion　zones　and　heat-affected　zones　of　aluminum　alloys　joined　by　a　narrow　weld.