Armagh struck late for a nervy and unconvincing one point win over Down to qualify for their second successive Ulster SFC final.
Substitute Jason Duffy hit the stoppage time winner to seal it for an Orchard side that failed to convince in front of a crowd of 12,116 at Clones.
They were clinging on to a slender advantage as the game slipped into injury-time, but points from subs Aidan Nugent and Duffy swung it for the Orchard.