Patent ID: 7841237

Claim:
An ultrasonic testing apparatus for a turbine fork of a turbine blade joined to a turbine disc, comprising: an ultrasonic testing sensor for sending ultrasonic waves and receiving reflected waves of the ultrasonic waves; a sensor mounting apparatus for mounting said ultrasonic testing sensor on a flat portion of a side surface of said turbine fork with said turbine blade joined to said turbine disc; an ultrasonic testing equipment for inspecting internal and external surfaces of said turbine fork by using the reflected waves, which are received by said ultrasonic testing sensor, from the internal surface of said turbine fork; wherein said sensor mounting apparatus has a pair of fixing pawls set to said turbine blade, a magnet holder being fixed on said turbine disc by magnetic force, a first rotating member attached to said magnet holder, an arm member, in which a through-groove is formed in a longitudinal direction of itself, turned around said first rotating member, a second rotating member, by which said ultrasonic testing sensor is moved along the longitudinal direction of said arm member, installed to said arm member in such a way that it passes through the through-groove, and a spring pressing said ultrasonic testing sensor against said flat portion of said side surface of said turbine fork together with said arm member, and surrounding said first rotating member.