A method may involve positioning a fixture over a portion of a tube portion of a gasket, where the gasket includes a first lip portion joined to a second lip portion by a weld of the gasket and the first lip portion joined to the second lip portion defines the tube portion, where the fixture comprises a housing and an injection port; positioning an ultrasonic probe in the housing; filling, by the injection port, coupling fluid between the ultrasonic probe and the tube portion of the gasket; and scanning at least a portion of the weld with the ultrasonic probe, where scanning the at least a portion of the weld may involve transmitting, by the ultrasonic probe, a plurality of ultrasonic waves through the coupling fluid into the tube portion, and translating the fixture in a longitudinal direction along the tube portion of the gasket.